tubular threaded joint that has enhanced high torque performance

专利摘要:
summary “tubular threaded joint that has improved high torque performance” is a tubular threaded joint that is free of harmful heavy metals, which has excellent peel resistance, gas tightness, and rust prevention properties and does not suffer from it. Easily flowing from shoulder portions even when subjected to high torque constitution is comprised of a pin 1 and a housing 2 having a contact surface comprising a non-threaded metal contact portion including a sealing portion 4a or 4b and a shoulder portion 5a or 5b and a threaded portion 3a or 3b. between the contact surface of at least one between the pin and the housing, the surfaces of the sealing portion and the shoulder portion have a first lubricating coating 10 in the form of a solid lubricating coating, and the surface of the threaded portion or of the entire surface of the contact surface has a second lubricant coating 11 selected from a viscous liquid lubricant coating and a solid lubricant coating. The first lubricant coating has a coefficient of friction that is greater than that of the second lubricant coating, and the second lubricant coating is positioned at the top in a portion where the first lubricant coating and the second lubricant coating are present. 34 1/1 34
公开号:BR112014008612B1
申请号:R112014008612-5
申请日:2012-11-16
公开日:2019-11-12
发明作者:Goto Kunio；Yamamoto Yasuhiro；Tanaka Yuji
申请人:Nippon Steel & Sumitomo Metal Corp；Nippon Steel Corp；Vallourec Oil & Gas France；
IPC主号:

专利说明:

FIELD OF TECHNIQUE [0001] This invention relates to a threaded tubular joint used to connect steel tubes and particularly OCTG (oil country tubular goods) petroleum tubes and a method of surface treatment of these. A tubular threaded joint according to the present invention can reliably exhibit excellent resistance to flaking without the application of a lubricating grease as a compound grease that was previously applied to threaded joints every time the constitution of OCTG oil pipes is carried out. Therefore, a tubular threaded joint according to the present invention can avoid the adverse effects on the global and human environment caused by compound grease. Furthermore, the joint does not deform easily even if the construction is carried out with a high torque, thus making it possible to create a stable metal-to-metal seal with an adequate operating margin.
BACKGROUND OF THE TECHNIQUE [0002] Petroleum tubes as a pipe and liner used for the excavation of oil wells for the exploitation of crude oil or diesel are generally connected to each other (constituted) using tubular threaded joints. In the past, the depth of oil wells was 2,000 to 3,000 meters, but in deep wells such as recent oil fields in the ocean, the depth sometimes reaches 8,000 to 10,000 meters or more. The length of oil pipes is typically a few meters, and the pipe through which a fluid such as crude oil flows is surrounded by a plurality of coatings. Therefore, the number of petroleum tubes that is connected by threaded joints reaches a very large number.
[0003] Since the tubular threaded joints of petroleum tubes are subjected in their environment of use to loads in the form of tensile forces in the axial direction caused by the mass of petroleum tubes and the joints themselves,
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2/60 composite pressures such as internal and external pressures, and geothermal heat, these need to maintain gas tightness without being damaged even in harsh environments.
[0004] Typical tubular threaded joints for connecting oil pipes (also referred to as special threaded joints) have a pin-box structure. A pin, which is a joint component that has male (external) threads, is typically formed on the outer surface of both ends of an OCTG oil pipe, and a box, which is a counterpart joint component that has female threads (internal) that engage the male threads, is typically formed on the inner surface of both sides of a coupling, which is a separate element. As shown in Figure 1, the pin has a shoulder portion (also referred to as a torque shoulder) formed on the end surface at the tip of the pin and a sealing portion formed between the end surface and the male threads. Correspondingly, the housing has a sealing portion and a shoulder portion located at the rear of the female threads and adapted to contact the sealing portion and the shoulder portion of the pin, respectively. The sealing portions and shoulder portions of the pin and housing constitute the non-threaded metal contact portions of a tubular threaded joint, and the non-threaded metal contact portions and the threaded portions of the pin and housing constitute the contact surfaces. of a tubular threaded joint. Patent Document 1 described below describes an example of such a special threaded joint.
[0005] To make this tubular threaded joint, an end (the pin) of an OCTG oil pipe is inserted into a coupling (box), and the male threads and the female threads are tightened up to the shoulder portions of the pin and of the box come into contact and interfere with an adequate torque. As a result, the sealing portions of the pin and housing come in close contact to form a metal-to-metal seal that guarantees the gas tightness of the threaded joint.
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3/60 [0006] Due to several problems that occur during the process of lowering the pipe or liner in an oil well, it is sometimes necessary to loosen a threaded joint that was formed, to raise the joint from the oil well, to tighten the same, and again lower it into the well. API (American Petroleum Institute) requires peel resistance so that the irreparable sticking referred to as peeling does not occur and gas tightness is maintained even if the tightness (constitution) and loosening break) are performed 10 times on a pipe joint 3 times in a casing joint.
[0007] To increase the resistance to flaking and gas tightness, a viscous liquid lubricant (lubricating grease) referred to as compound grease or dope and containing heavy metal powder has previously been applied to the contact surfaces of a threaded joint whenever constitution is performed. This compound grease is prescribed by API BUL 5A2.
[0008] In order to increase the retention of compound grease and improve the sliding properties, it was proposed to subject the contact surfaces of a threaded joint to various types of surface treatment to form one or more layers such as nitride treatment, several types of galvanization including zinc plating and dispersion galvanizing, and treatment by chemical conversion of phosphate. However, as determined below, the use of compound grease can have adverse effects on the environment and humans.
[0009] Compound grease contains large amounts of heavy metal dust such as zinc, lead, and copper. At the time of forming a threaded joint, the applied grease is removed by washing or sent to the external surface, and this can have an adverse effect on the environment and especially on marine life, particularly due to harmful heavy metals such as lead. In addition, the process of applying compound grease deteriorates the work environment and work efficiency, and there is also a problem of harm to humans.
[0010] In recent years, as a result of the 1998 decree of OSPAR
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4/60
Convention (Oslo-Paris Convention) with the objective of preventing marine pollution in the Northeast Atlantic, strict environmental regulations are being enacted on a global scale, and in some regions, the use of compound grease is already being regulated. Consequently, in order to avoid harmful effects on the environment and humans during the excavation of gas wells and oil wells, a demand has been developed for threaded joints that can exhibit excellent resistance to flaking without using compound grease.
[0011] As a threaded joint that can be used to connect oil pipes without the application of compound grease, the present applicant proposed in Patent Document 2 a threaded joint for steel pipes that have a viscous or semi-solid liquid lubricant coating and Patent Document 3 a threaded joint for steel tubes that have a solid lubricant coating.
[0012] Patent Document 1: JP 5-87275 A [0013] Patent Document 2: JP 2002-173692 A [0014] Patent Document 3: WO 2009/072486
SUMMARY OF THE INVENTION [0015] As determined above, with a special threaded joint like the one shown in Figure 1 consisting of a pin and a housing with a sealing portion, the sealing portions of the pin and the housing form a metal-to-metal seal for guarantee gas tightness at the end of the constitution.
[0016] Figure 2 shows a graph of torque at the moment of constitution of this type of threaded joint (ordered: torque, abscissa: number of turns). As shown in this figure, as rotation occurs, the threaded portions of the pin and housing initially come into contact and the torque gradually increases. Subsequently, the sealing portions of the pin and housing come into contact, and the rate of torque increase increases. Eventually, the shoulder portion at the tip of the pin and the shoulder portion of the box come into contact and begin to interfere (the torque at the beginning of this
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5/60 interference is referred to as the shoulder torque Ts), with which the torque increases abruptly. The constitution is completed when the torque reaches a predetermined constitution torque. The optimal torque in Figure 2 means the torque that is optimal for the completion of constitution with the obtaining of an amount of interference in the sealing portions that is necessary to guarantee the gas tightness. An appropriate value for the optimal torque is predetermined depending on the inside diameter and the type of a joint.
[0017] However, in a special threaded joint used in very deep wells where compressive stresses and bending stresses are applied, the constitution is sometimes carried out with a torque that is greater than usual to prevent the tight thread from loosening. In this case, the shoulder portion at the end of the pin and the shoulder portion of the box that comes into contact sometimes deform, resulting in plastic deformation of the shoulder portion of at least one element of the pin and the box. As a result, as shown in Figure 2, the rate of torque increase decreases suddenly. The torque at the time of flow and plastic deformation occurs is referred to as the flow torque Ty. The flow of the shoulder portions results in a gas tightness failure.
[0018] In a threaded joint that is constituted with a high torque, it is advantageous that the value of [Ty minus Ts] (Ty-Ts = ÁT, or the torque shoulder resistance) is large. However, in the tubular threaded joints described in Patent Document 2 that have a viscous or semi-solid liquid lubricant coating, Ty is low compared to when a conventional compound grease is applied. As a result, ÁT becomes small, and the shoulder portions flow in a low torque build, so it is sometimes impossible to perform a build with a high torque. In the tubular threaded joints described in Patent Document 3 that also have a solid lubricant coating, ÁT becomes smaller than that of a conventional compound grease.
[0019] The purpose of the present invention is to provide a gasket
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6/60 threaded tubular that does not easily flow from its shoulder portions even when it is built with high torque and it has a lubricant coating that does not contain harmful heavy metals, it has excellent resistance to flaking, gas tightness, and properties of rust prevention, and this can provide a large ATT to the joint.
[0020] It was found that even if the composition of a lubricant coating varies to vary its friction coefficient, ΔΤ does not change much, as Ts and Ty typically vary in the same direction. For example, if the friction coefficient of a lubricant coating increases, Ty increases, but Ts also increases (a phenomenon referred to as high shoulder formation). As a result, in the worst case, the condition referred to as no shoulder formation occurs in which the shoulder portions do not come into contact at a predetermined build torque and the build cannot be completed.
[0021] The present inventors have found that with a tubular threaded joint that has a viscous or solid liquid lubricant coating that does not contain harmful heavy metals that impose an overload on the global environment, by forming a high friction solid lubricant coating on a portion of the contact surface (the threaded portion and the non-threaded metallic contact portion) of at least one between a pin and a box as on the shoulder portion that is initially contacted and preferably on the non-threaded metallic contact portion that includes the portion sealant and the shoulder portion, and form at least on the remaining portion of the contact surface a lubricating coating selected from a viscous liquid lubricating coating and a solid lubricating coating having a lower coefficient of friction than the solid lubricating coating of high friction, a tubular threaded joint is obtained with a large ÁT does not undergo shoulder formation while having sufficient peeling resistance, gas tightness, and rust prevention properties.
[0022] The mechanism by which a large ATT is obtained is seen
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7/60 usually as follows.
[0023] The constitution of a tubular threaded joint is accomplished by inserting a pin in a box and then rotating the pin or box. Initially, only the threaded portions of the pin and housing come into contact and engage in a threaded manner. In the final constitution stage, the sealing portions and shoulder portions begin to come into contact, and the constitution is completed when a predetermined amount of interference is obtained between the sealing portions and the shoulder portions.
[0024] As shown in Figure 5 (A), for example, with a tubular threaded joint that has a high friction solid lubricant coating on the sealing portions and the shoulder portions of the contact surfaces of a pin and a box and a lubricant coating that has a lower coefficient of friction on the remaining portion (mainly the threaded portions), while only the threaded portions of the pin and housing come into contact initially, a low friction state is achieved by the lubricant coating which has a low friction coefficient covering the threaded portions, then Ts becomes low. In the final constitution stage, when the sealing portions and shoulder portions begin to come in contact, the high-friction solid lubricant coatings that cover these portions come into contact, causing a state of high friction to occur and causing Ty increase. As a result, AT is increased.
[0025] The present invention, which is based on this knowledge, is a tubular threaded joint consisting of a pin and a housing that have a contact surface comprising a non-threaded metal contact portion that includes a sealing portion and a portion of shoulder and a threaded portion, characterized by the fact that the contact surface of at least one between the pin and the housing has a first lubricating coating and a second lubricating coating, the first lubricating coating being a solid lubricating coating formed on a portion of the contact surface that includes the shoulder portion, the second coating
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8/60 lubricant is selected from a viscous liquid lubricant coating and a solid lubricant coating and formed at least on the portion of the contact surface where the first lubricant coating is not present, the first lubricant coating has a friction coefficient that is greater than that of the second lubricating coating, the second lubricating coating is positioned at the top in a portion where the first lubricating coating and the second lubricating coating are present.
[0026] The portion of the contact surface that has the first lubricant coating may be only the shoulder portion, but preferably this is the entire non-threaded metallic contact portion, that is, the sealing portion and the shoulder portion.
[0027] The second lubricant coating can only be provided over the portion of the contact surface that does not have the first lubricant coating, or it can be provided over the entire contact surface that has the first lubricant coating. In the latter case, the second lubricant coating is positioned over the first lubricant coating.
[0028] The preferred coating thicknesses for each coating are as follows.
[0029] The coating thickness of the first lubricant coating is 5 to 40 pm.
[0030] The coating thickness of the viscous liquid lubricant coating as a second lubricant coating is 5 to 200 pm. However, when that viscous liquid lubricant coating is positioned over the first lubricating coating, the total coating thickness of the first lubricating coating and that of the viscous liquid lubricating coating is at most 200 pm.
[0031] The coating thickness of the solid lubricant coating as a second lubricant coating is 5 to 150 pm. However, when
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9/60 this solid lubricant coating is positioned over the first lubricant coating, the total coating thickness of the first lubricant coating and that of the second solid lubricant coating is at most 150 pm.
[0032] When the contact surface of only one between the pin and the housing has the first lubricating coating and the second lubricating coating as described above, there are no particular limitations regarding the contact surface of the other element of the pin and the housing, and it may be in an untreated state (for example, it may be in a state after the preparatory surface treatment described below). Preferably, however, at least a portion of the contact surface of the other element and preferably the entire contact surface has any of the following surface treatment coatings formed on it:
1) a lubricant coating selected from a viscous liquid lubricant coating and a solid lubricant coating,
2) a solid anti-corrosion coating, or
3) a lower layer in the form of a lubricant coating selected from a viscous liquid lubricant coating and a solid lubricant coating, and an upper layer in the form of a solid anticorrosive coating.
[0033] The solid anticorrosive coating is preferably a coating based on an ultraviolet curing resin. The lubricant coating may be the first lubricant coating or the second solid lubricant coating described above.
[0034] The contact surface of at least one and preferably both the pin and the box may have previously been subjected to surface treatment by a method selected from one or more of blasting treatment, pickling, chemical conversion treatment of phosphate, oxalate chemical conversion treatment, borate chemical conversion treatment, electroplating, and impact galvanizing to increase the
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10/60 adhesion and retention of a coating formed on the contact surface and / or to increase the resistance to flaking of the threaded joint.
[0035] In a tubular threaded joint in accordance with the present invention, a lubricant coating that is formed on its contact surfaces requires a large ΔΤ as observed with a coating made from a conventional lubricating grease such as compound grease that contains harmful heavy metals . Therefore, even at the moment of constitution with a high torque, it is possible to carry out the constitution without the occurrence of flow or flaking of the shoulder portions. Furthermore, flaking can be suppressed even under severe conditions such as during unstable excavation operations in the ocean. In addition, since the lubricant coating does not contain substantially harmful heavy metals such as lead, it hardly overburdens the global environment. A tubular threaded joint in accordance with the present invention suppresses the occurrence of rust, and it can continue to exhibit a lubricating function even when subjected to repeated constitution and rupture, so it guarantees gas tightness after constitution.
BRIEF EXPLANATION OF THE DRAWINGS [0036] Figure 1 shows schematically the non-threaded metallic contact portions (the shoulder portions and sealing portions) of a special threaded joint.
[0037] Figure 2 is a typical torque graph at the moment of constituting a special threaded joint.
[0038] Figure 3 shows schematically the assembled structure and a steel tube and a coupling when transporting the steel tube.
[0039] Figure 4 shows schematically a cross section of a special threaded joint.
[0040] Figures 5 (A) - 5 (C) show examples of the structure of coatings in a tubular threaded joint according to the present invention.
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11/60 [0041] Figures 6 (A) - 6 (C) show examples of the structure of different coatings in a tubular threaded joint according to the present invention.
MODES FOR CARRYING OUT THE INVENTION [0042] Below, the modalities of a tubular threaded joint according to the present invention will be explained in detail by way of example. The present invention is not limited to the modalities mentioned below.
[0043] Figure 3 shows schematically the state of a typical tubular threaded joint at the time of transport. A pin 1 that has a male threaded portion 3a is formed on the outer surface of both ends of a steel tube A, and a box 2 that has a female threaded portion 3b is formed on the inner surface of both sides of a coupling B Coupling B was previously connected to one end of steel tube A. Although not shown in the drawing, a protector to protect the threaded portions was previously mounted on the unconnected pin of steel tube A and the unconnected housing of coupling B before transportation. These protectors are removed from the threaded joint before use.
[0044] As shown in the drawing, in a typical tubular threaded joint, a pin is formed on the outer surface of both ends of a steel tube and a box is formed on the inner surface of a coupling, which is a separate element. There are also integral tubular threaded joints that do not use a coupling and where one end of a steel tube becomes a pin and the other end becomes a box. A tubular threaded joint according to the present invention can be one of two types.
[0045] Figure 4 shows schematically the structure of a special threaded joint (referred to below simply as a threaded joint), which is a typical tubular threaded joint used to connect petroleum pipes. This threaded joint consists of a pin 1 formed on the outer surface
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12/60 of an end of a steel tube A and a box 2 formed on the inner surface of a coupling B. Pin 1 has a male threaded portion 3a, a sealing portion 4a located near the end of the steel tube, and a shoulder portion 5a on its end surface. Correspondingly, the housing 2 has a female threaded portion 3b, and a sealing portion 4b and a shoulder portion 5b on its inner side.
[0046] The sealing portions and shoulder portions of pin 1 and housing 2 are non-threaded metal contact portions, and non-threaded metal contact portions (that is, the sealing portions and shoulder portions) and the threaded portions are the contact surfaces of the threaded joint. These contact surfaces must have peeling resistance, gas tightness, and rust prevention properties. In the past, to provide these properties, (a) a grease containing heavy metal powder was applied to the contact surface of at least one pin and the housing, or (b) a viscous, semi-solid liquid coating or solid lubricant was formed on the contact surface. However, as determined above, (a) it has the problem that it has an adverse effect on humans and the environment, and (b) it has the problem of a small ΔΤ, so when the constitution is performed with a high torque, there is the possibility of draining the shoulder portions that occurs before the end of the constitution.
[0047] A threaded joint according to the present invention has a first lubricating coating and a second lubricating coating on the contact surface of at least one element of the pin and the housing. The first lubricant coating is a solid lubricant coating formed on a portion of the contact surface that includes at least the shoulder portion. The second lubricating coating is selected from a viscous liquid lubricating coating and a solid lubricating coating and formed at least in the portion of the contact surface where the first lubricating coating is not present. The first lubricant coating is a coating that has relatively high friction with a coefficient of
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13/60 friction that is greater than the friction coefficient of the second lubricant coating.
[0048] Below, the first lubricant coating will be referred to as a high friction solid lubricant coating, and when the second lubricant coating is a solid lubricant coating, that solid lubricant coating will sometimes be referred to as a second solid lubricant coating.
[0049] In places close to the threaded portions between the threaded portions and the sealing portions of the pin and the housing of a threaded joint, a portion where the pin and the housing do not come into contact when the threaded joint is constituted is provided with the purpose of preventing lubricating components from dripping when the threaded joint is formed. In some threaded joints, a non-contact region is provided where the pin and housing intentionally do not come into contact. Those portions where the pin and the box do not come into contact at the moment of constitution are not part of the contact surfaces, and it does not matter whether a coating according to the present invention is applied to these portions.
[0050] A solid high-friction lubricant coating that is the first lubricant coating is formed only on a portion of the contact surface of one or each pin and box that includes the shoulder portion. The portion of the contact surface that has the high friction solid lubricant coating is the total non-threaded metallic contact portion that includes the sealing portion and the shoulder portion. That is, the solid, high-friction lubricant coating is formed over the sealing portion and the shoulder portion of the contact surface of at least one between the pin and the housing. At least the remaining portion of the contact surface that lacks the high friction solid lubricant coating has a second lubricant coating selected from a viscous liquid lubricant coating and a solid lubricant coating formed thereon. The second lubricating coating is formed over the entire contact surface, in this case, the second lubricating coating is positioned on the high friction solid lubricating coating.
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14/60 (that is, forms a top layer). [0051] When the contact surface of only one element of the pin and the housing has the solid lubricating coating of high friction and the second lubricant coating, there is no particular limitation on the surface treatment of the contact surface of the other element of the pin and from the box. For example, a high friction solid lubricant coating that can be the same or different from the first lubricant coating, a viscous liquid lubricant coating or a solid lubricant coating that can be the same or different from the second lubricant coating, a solid anticorrosive coating, and a combination of a lower layer in the form of a lubricating coating and particularly a viscous liquid lubricating coating and an upper layer in the form of a solid anticorrosive coating can be formed on at least a portion of the contact surface and preferably on the entire contact surface of the other element. Alternatively, the contact surface of the other element can be left untreated, or it can be subjected only to the preparatory surface treatment described below to make the surface rough (as a chemical phosphate conversion treatment).
[0052] Figures 5 (A) - (C) and Figures 6 (A) - (B) show several possible modalities of combinations of the first and second lubricant coatings. In these figures, the male threads of the threaded portion of the pin 1, the thread 3a 'at the extreme end and closest to the sealing portion 4a are formed with an incomplete shape that is observed at the beginning of the thread cutting. By producing the thread at the extreme end of incomplete pin threads, pin fitting becomes easier, and the possibility of damage to the threaded portion of the box at the time of pin fitting is reduced.
[0053] Figure 5 (A) shows a modality in which the non-threaded metallic contact portions (the sealing portions and the shoulder portions) of the contact surfaces of the pin and the housing have a solid high-friction lubricant coating 10 , and the rest of each contact surface, which is usually the threaded portion, has a second coating
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15/60 lubricant 11.
[0054] Figure 5 (B) shows a modality in which the non-threaded metallic contact portions of the contact surfaces of the pin and the housing have a high-friction solid lubricant coating 10, and a second lubricant coating 11 that fully covers each contact surface is formed over each solid high friction lubricant coating 10.
[0055] Figure 5 (C) shows a modality in which one between the pin and the housing (the pin in the figure) has a solid high-friction lubricant coating 10 that covers the non-threaded metal contact portion and over that one second lubricant coating 11 that covers the entire contact surface in the same manner as in Figure 5 (B), and the entire contact surface of the other element (the box in the figure) is covered with a second lubricant coating
11.
[0056] Figure 6 (A) shows a modality in which one between the pin and the housing (the pin in the figure) has a solid high-friction lubricant coating that covers the non-threaded metal contact portion and a second lubricant coating 11 which covers the rest of the contact surface in the same way as in Figure 5 (A), and the entire contact surface of the other element (the box in the figure) is covered by a second lubricant coating
11.
[0057] Figure 6 (B) shows an embodiment in which one between the pin and the housing (the housing in the figure) has a solid high-friction lubricant coating 10 that covers the non-threaded metal contact portion and a second coating lubricant 11 that covers the rest of the contact surface in the same way as in Figure 5 (A), and the entire contact surface of the other element (the pin in the figure) is covered by a solid anti-corrosion coating
12.
[0058] Figure 6 (C) shows a modality in which one between the pin and the housing (the pin in the figure) has a solid high-friction lubricant coating 10 that covers the non-threaded metal contact portions and on these
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16/60 a second lubricant coating 11 that covers the entire contact surface in the same manner as in Figure 5 (B), and the entire contact surface of the other element (the box in the figure) is covered by a solid high lubricating coating. friction 10.
[0059] It is understood by the elements skilled in the art that a tubular threaded joint according to the present invention can have a coating structure that is a combination of coatings except for the combinations described above. For example, the second lubricant coating 11 in one between the pin and the housing in Figure 5 (A) or the pin in Figure 6 (A) can be replaced with a solid anti-corrosion coating. In that case, the second lubricant coating 11 which is present on only one element covers the portion in which the high friction solid lubricant coating is not formed including at least the threaded portion as shown in Figure 6 (B).
[0060] In the following, various coatings covering the contact surfaces of a threaded tubular joint in accordance with the present invention will be explained. Unless otherwise specified,% relative to the content of the coating components means% by weight. This content is substantially the same content based on the total solids content (the total content of non-volatile components) of a coating composition to form a lubricant coating.
[HIGH FRICH SOLID LUBRICANT COATING] [0061] The high friction solid lubricant coating is a solid lubricant coating that has a relatively high friction coefficient compared to the second lubricant coating. This produces a state of high friction in the final stage of forming a threaded joint (starting when the shoulder portions of the pin and housing come into contact until the sealing portions come in intimate contact with a predetermined amount of interference), thereby increasing AT by increasing Ty and making it difficult for the shoulder portions to flow even when constitution is performed with a high torque.
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17/60 [0062] In the present invention, a solid high-friction lubricant coating that has an effect is provided to cover a portion of the contact surface that includes at least the shoulder portion of at least one between a pin and a housing. Preferably, the entire non-threaded metal contact portion including the sealing portion and the shoulder portion is covered by the high friction solid lubricant coating. When a threaded joint has a plurality of sealing portions and shoulder portions, it is preferred to fully cover the sealing portions and shoulder portions with a solid, high-friction lubricant coating. However, the goal of increasing ΔΤ can be achieved even if only the shoulder portions where the contact initially occurs in the final stage of forming a threaded joint are covered with a solid, high-friction lubricant coating. The location where a high friction solid lubricant coating is formed can be properly established according to the shape of a joint and the required performance.
[0063] Even when a second lubricant coating 11 is formed on the high friction solid lubricant coating 10 as on pin 1 and housing 2 as shown in Figure 5 (B) or on pin 1 as shown in Figure 5 (C) , a high friction state is achieved by the high friction solid lubricant coating 10 in the final constitution stage, and a desired effect of increasing ΔΤ can be obtained. The high friction solid lubricant coating must have a higher friction coefficient than the second lubricant coating 11. A certain degree of adhesion to the substrate (the contact surfaces of the pin and housing, which may be in the machined state or may have a preparatory surface treatment coating as a format by chemical phosphate conversion treatment or metal plating) is required.
[0064] An example of a high friction solid lubricant coating that is suitable for use in the present invention is a coating comprising an organic resin or inorganic polymer that contains little or
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18/60 no solid lubricating particle (as in an amount of a maximum of 5% by weight, preferably a maximum of 3% by weight, and more preferably a maximum of 1% by weight based on the total solids content).
[0065] A particularly preferred high-friction solid lubricant coating is a solid lubricant coating that is formed from a film-forming composition that is used for lubricating treatment before steel hydroforming. Specific examples of this composition are Surflube C291 manufactured by Nippon Paint Co., Ltd. (based on a water-soluble resin) and Gardolube L6334 and L6337 manufactured by Chemetall GmbH. A solid lubricant coating formed from this type of composition has a coefficient greater friction than a lubricant coating used to lubricate threaded joints (such as a lubricant coating selected from a viscous liquid lubricant coating and a second solid lubricant coating used in the present invention), and this forms a solid lubricant coating that has adhesion and affinity satisfactory to a lubricant coating. However, the solid lubricant coating that is formed still has satisfactory lubricating properties and sliding properties, so as shown in Figure 5 (A) and Figure 6 (B), for example, even though a second lubricant coating that has a low friction coefficient is not present in the non-threaded metal contact portion that includes the shoulder portion, the peeling resistance required for constitution and sufficient gas tightness after constitution are obtained if a second lubricant coating is present in the threaded portions of at least one between the pin and the box.
[0066] Another high friction solid lubricant coating that can be used is a coating that comprises the same components as the second solid lubricant coating described below, but which has a reduced content of a solid lubricant (lubricating powder).
[0067] The friction coefficient of a solid lubricant coating or a viscous liquid lubricant coating can be measured according to
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ASTM D2625 (load-bearing capacity and service life of solid film lubricants) or ASTM D2670 (wear properties of fluid lubricants) by the Falex pin and Vee block method (referred to below as the Falex method) using a Falex pin and Vee block. In the Falex method, blocks (V-shaped blocks) that have a tip with a V-shaped opening are arranged facing opposite sides of a pin, and the pin is rotated while applying a predetermined pressure load to the blocks to measure the coefficient friction.
[0068] The measurement of the friction coefficient can be performed using test pieces consisting of blocks and a pin that are obtained from a steel billet made of the same material used in a tubular threaded joint and which have been subjected to the same preparatory surface treatment and surface coating treatment. The measurement is performed around 1 GPa, which corresponds to the maximum pressure of the sealing portions when a tubular threaded joint is formed, and the average friction coefficient in a state of fixed friction before the occurrence of flaking can be compared. Naturally, a high friction solid lubricant coating according to the present invention can be selected based on the friction coefficient measured using another friction gauge normally used in a laboratory. Any measurement method is sufficient for the friction coefficient of the high-friction solid lubricant coating to be greater than the friction coefficient of the second lubricant coating when the measurement is performed under the same conditions.
[0069] As long as the high friction solid lubricant coating according to the present invention has a higher friction coefficient than the viscous liquid lubricant coating or the second solid lubricant coating used as the second lubricant coating, there is no particular lower limit on the friction coefficient of the high-friction solid lubricant coating. However, to adequately achieve the goal of increasing Ty and increasing AT, the friction coefficient of the high
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The friction is preferably greater to a certain extent than the friction coefficient of the second lubricant coating. Preferably, the friction coefficient of the high friction solid lubricant coating is at least 1.5 times, more preferably at least 2 times, and most preferably at least 2.5 times the friction coefficient of the second lubricant coating.
[0070] The friction coefficient of the high-friction solid lubricant coating as measured by the Falex method described above is preferably at least 0.06, more preferably at least 0.08, and most preferably at least 0.1. Since an extremely high friction coefficient has an adverse effect on the peeling resistance of a threaded joint, the friction coefficient of the high-friction solid lubricant coating is preferably at most 0.25 and most preferably at most 0.20.
[0071] The thickness of the high-friction solid lubricant coating is preferably 5 - 40 pm. If it is less than 5 pm, the effect of producing a high level of friction at the moment of contact and resistance to peeling may be inadequate. On the other hand, if this exceeds 40 pm, not only does the increased friction effect reach a limit, but an adverse effect on the properties of the sealing portion can be developed.
[0072] The high friction solid lubricant coating can be formed by coating methods well known to those skilled in the art. To form a solid, high-friction lubricating coating on a portion of the contact surface of the pin and / or housing, that is, only on the shoulder portion or the non-threaded metallic contact portion that includes the sealing portion and the spray coating can be carried out while protecting the portions where it is not desired to form the high friction solid lubricant coating. Upon drying to evaporate the solvents after application, a solid, high-friction lubricant coating is formed.
[LIQUID LIQUID COATING] [0073] A viscous liquid lubricant coating can be formed
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21/60 using a lubricating grease that was conventionally used to increase the resistance to flaking of the contact surfaces of a threaded joint. It is preferred to use a lubricating grease referred to as a raw dope that has little adverse effect on the environment and contains little or no heavy metal powder.
[0074] A preferred example of such a viscous liquid lubricant coating is a coating comprising an appropriate amount of a base oil and at least one material selected from a resin-based material, wax, metal soap, and a salt of base metal of an aromatic organic acid. Among these components, a resin-based material is mainly effective for increasing the friction coefficient of a lubricant coating, that is, for increasing ΔΤ, while wax, metal soap, and a basic metal salt of an aromatic organic acid they are mainly effective in preventing a lubricant coating from peeling off. Therefore, it is possible for a coating to exhibit adequate lubricating performance even if it does not contain a powder of a soft heavy metal such as lead or zinc. A particularly preferred viscous liquid lubricant coating comprises a resin-based material, wax, metal soap, and a basic metal salt of an aromatic organic acid.
[0075] A resin-based material is selected from resin and its derivatives. When it is contained in a lubricant coating, it becomes highly viscous when subjected to high pressure in a friction interface. As a result, this is effective for increasing ΔΤ of the coating. The resin that is used can be any liquid resin, gum-resin, and wood resin, and various resin derivatives such as resin esters, hydrogenated resins, polymerized resins, and disproportionate resins can also be used. The content of the resin-based material in the lubricant coating is preferably 5 to 30% and more preferably 5 to 20%.
[0076] Wax not only has the effect of preventing flaking by reducing the friction of a lubricant coating, but also decreasing the fluidity of the
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22/60 coating and increase coating resistance. Any animal, vegetable, mineral, and synthetic wax can be used. Examples of waxes that can be used as beeswax and whale tallow (animal waxes); Japan wax, carnauba wax, candelilla wax, and rice wax (vegetable waxes); paraffin wax, microcrystalline wax, petrolatum, lignite wax, ozoquerite, and ceresin (mineral waxes); and oxide wax, polyethylene wax, Fischer-Tropsch wax, amide wax, and hardened castor oil (castor wax) (synthetic waxes). Among these, paraffin wax with a molecular weight of 150 to 500 is preferred. The wax content of a lubricant coating is preferably 2 to 20%.
[0077] A metal soap, which is a salt of a fatty acid with a metal except an alkali metal, is effective in increasing the flaking prevention effect and the rust prevention effect of a coating. The content of this is preferably 2 to 20%.
[0078] The fatty acid of a metal soap is preferably one that has 12 to 30 carbon atoms from the point of view of lubricating properties and rust prevention. The fatty acid can be saturated or unsaturated. Mixed fatty acids derived from natural oils and fats such as beef tallow, lard, lanolin, babassu oil, rapeseed oil, and coconut oil, and simple compounds such as lauric acid, tridicyclic acid, myristic acid, palmitic acid , lanopalmitic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, arachidic acid, behenic acid, erucic acid, lignoceric acid, lanoceric acid, a sulfonic acid, salicylic acid, and a carboxylic acid can be used. The metal salt is preferably in the form of a calcium salt, but this can also be a salt from another alkaline earth metal or a zinc salt. The salt can be a neutral salt or a basic salt.
[0079] A viscous liquid lubricant coating may contain a base metal salt of an aromatic organic acid selected from basic sulfonates, basic salicylates, basic phenates, and basic carboxylates as a rust prevention agent. Each base metal salt of a
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23/60 aromatic organic acid is a salt of an aromatic organic acid with excess alkali (an alkali metal or an alkaline earth metal) in which excess alkali is present as fine colloid particles dispersed in oil. These basic metal salts consist of a grease or a semi-solid substance at room temperature, and exhibit a lubricating action in addition to a rust prevention action. The alkali that forms the cation part of a base metal salt of an aromatic organic acid can be an alkali metal or an alkaline earth metal, but preferably it is an alkaline earth metal and particularly calcium, barium, or magnesium, each providing the same effect. The content of this in the lubricant coating is preferably 10 to 70%.
[0080] The greater the base number of the base metal salt of an aromatic organic acid used as a rust prevention agent, the greater the amount of fine particles of the salt that function as a solid lubricant, and the lubricating properties ( peeling resistance) that can be conferred by the lubricant coating will be better. When the base number exceeds a certain level, the salt has the effect of neutralizing the acidic components, and the rust prevention effect of the lubricant coating is increased. For these reasons, it is preferred to use one that has a base number (JIS K 2501) of 50 to 500 mgKOH / g. A preferred base number is 100 to 500 mg KOH / g, and more preferably it is in the range of 250 to 450 mg KOH / g.
[0081] To suppress the fluidity of a viscous liquid lubricant coating at high temperatures and to further increase its resistance to roughness, the lubricant coating may contain a lubricating powder. The lubricating powder can be any that is harmless and non-toxic and that does not excessively reduce the friction coefficient. A preferred lubricating powder is graphite. Amorphous graphite that produces little reduction in the friction coefficient is more preferred. The content of a lubricating powder is preferably 0.5 to 20%.
[0082] To increase the dispersion uniformity of a solid lubricating powder in the lubricant coating or to improve the coating properties
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24/60 lubricant, the lubricant coating may include components except those described above, such as one or more components selected from organic resins and various oils and additives commonly used in lubricating oils (such as an extreme pressure agent).
[0083] Oils refer to lubricating components that are liquid at room temperature and that can be used in lubricating oils. The oils themselves have lubricating properties. Examples of oils that can be used include synthetic esters, natural oils, and mineral oils. The rust prevention agents described above (basic salts of aromatic organic acids) also have lubricating properties, so that they also function as oils. The properties of a lubricant coating vary with the oil content. If a coating does not contain an oil or if the oil content is too low, the lubricating coating does not become a viscous liquid lubricating coating and instead becomes a solid lubricating coating. In the present invention, such a lubricant coating can also be used as a solid lubricant coating.
[0084] An organic resin and particularly a thermoplastic resin suppresses adhesion of the lubricant coating and increases the thickness of the coating, and when it is introduced into a friction interface, it increases the resistance to flaking and decreases the friction between the metal portions of contact even when a high build torque (a high pressure) is applied. Therefore, it can be contained in a lubricant coating. In such cases, it is preferred to use a powdered resin that has a particle diameter in the range of 0.05 to 30 pm and more preferably in the range of 0.07 to 20 pm.
[0085] Some examples of thermoplastic resins are polyethylene resins, polypropylene resins, polystyrene resins, poly (methyl acrylate) resins, styrene-acrylic acid copolymer resins, polyamide resins, and polybutene resins (polybutylene) ). A copolymer or mixture or between these resins or between these resins and other thermoplastic resins
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25/60 can also be used. The density of the thermoplastic resin (JIS K 7112) is preferably in the range of 0.9 to 1.2. Furthermore, in view of the need for the resin to flow easily on a friction surface to exhibit lubricating properties, the thermal deformation temperature (JIS K 7206) of the resin is preferably 50 to 150 ° C.
[0086] When the lubricant coating contains a thermoplastic resin, its content in the coating is preferably at most 10% and more preferably in the range of 0.1 to 5%. The total content of the resin-based material described above and the thermoplastic resin is preferably at most 30%.
[0087] Examples of natural oils and fats that can be used as an oil include beef tallow, lard, lanolin, babassu oil, rapeseed oil, and coconut oil. A mineral oil (including a synthetic mineral oil) that has a viscosity at 40 ° C of 10 to 300 cSt can also be used as an oil.
[0088] A synthetic ester that can be used as an oil can increase the plasticity of the thermoplastic resin and at the same time can increase the fluidity of the lubricant coating when subjected to hydrostatic pressure. In addition, a synthetic ester with a high melting point can be used to adjust the melting point and the hardness (softness) of the lubricant coating. Examples of a synthetic ester are fatty acid monoesters, dibasic acid diesters, and trimethylolpropane or pentaerythritol fatty acid esters.
[0089] Examples of fatty acid monoesters are carboxylic acid monoesters having 12 to 24 carbon atoms with higher alcohols having 8 to 20 carbon atoms. Examples of dibasic acid diesters are dibasic acid diesters having 6 to 10 carbon atoms with higher alcohols having 8 to 20 carbon atoms. Examples of fatty acids that make up a fatty acid ester of trimethylolpropane or pentaerythritol are those that have 8 to 18 atoms of
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26/60 carbon.
[0090] When a lubricant coating contains at least one of the above oils, the oil content preferably becomes at least 0.1% by mass to obtain an increase in peeling resistance. The content preferably becomes a maximum of 5% by weight to prevent a reduction in coating strength.
[0091] An extreme pressure agent has the effect of increasing the roughness resistance of the lubricant coating when added in a small amount. Non-limiting examples of an extreme pressure agent are vulcanized oils, polysulfides, and phosphates, phosphites, thiophosphates, and metal salts of dithiophosphoric acid. When an extreme pressure agent is contained in a lubricant coating, its content is preferably in the range of 0.05 to 5% by weight.
[0092] Examples of preferred vulcanized oils are compounds that contain 5 to 30% by weight of sulfur and are obtained by adding sulfur to unsaturated animal or vegetable oils such as olive oil, castor oil, rice bran oil, seed oil cotton, rapeseed oil, soy oil, corn oil, beef tallow, and lard and heat the mixture.
[0093] Examples of preferred polysulfides are polysulfides of the formula R1- (S) c-R2 (where R1 and R2 can be the same or different and are an alkyl group having 4 to 22 carbon atoms, an aryl group, a group alkylaryl, or an arylalkyl group, and c is an integer from 2 to 5) and olefin sulfides that contain 2 to 5 sulfur bonds per molecule. Dibenzyl disulfide, di-tert-dodecyl polysulfide, and di-tert-nonyl polysulfide are particularly preferred.
[0094] Phosphates, phosphites, thiophosphates, and metal salts of dithiophosphoric acid may belong to the following general formulas.
phosphates: (R3O) (R4O) P (= O) (OR5) phosphites: (R3O) (R4O) P (OR5) thiophosphates: (R3O) (R4O) P (= S) (OR5)
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27/60 metal salts of dithiophosphoric acid: [(R3O) (R6O) P (= S) -S] 2-M [0095] In the formulas above, R3 and R6 consist of an alkyl group having 1 to 24 atoms of carbon, a cycloalkyl group, an alkylcycloalkyl group, an aryl group, an alkylaryl group, or an arylalkyl group, R4 and R5 consist of a hydrogen atom, an alkyl group that has 1 to 24 carbon atoms, a cycloalkyl group, a alkylcycloalkyl group, an aryl group, an alkylaryl group, or an arylalkyl group, and M is molybdenum (Mo), zinc (Zn), or barium (Ba).
[0096] In addition to the components described above, the viscous liquid lubricant coating may contain an antioxidant, a preservative, a dye, and the like.
[0097] A viscous liquid lubricant coating can be formed by applying a coating composition to the contact surfaces of at least one between the pin and the housing of a threaded joint, and drying the coating if necessary. Depending on the coating method, the composition that is used may contain a volatile organic solvent in addition to the components described above.
[0098] When the coating composition is a solid or semi-solid at room temperature, it can be applied after being heated to reduce its viscosity (for example, it can be applied with a spray gun in the form of a hot melt) .
[0099] When heating is not employed, a solvent is contained in the coating composition to reduce the viscosity of the composition to a viscosity sufficient for application. As a result, the coating thickness and the composition of the lubricant coating that is formed become uniform and the coating formation can be carried out efficiently. Examples of preferred solvents are petroleum solvents as solvents corresponding to industrial gasoline prescribed by JIS K 2201, turpentine, aromatic petroleum naphtha, xylene, and Cellosolve. Two or more of these can be used in combination. A solvent that has a point
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28/60 flash of at least 30 ° C, an initial boiling point of at least 150 ° C, and a final boiling point of a maximum of 210 ° C is preferred as this is relatively easy to handle and evaporates quickly , then the drying time may be short.
[00100] A preferred coating thickness of the viscous liquid lubricant coating is 5 to 200 pm and more preferably 15 to 200 pm. The lubricant coating is preferably thick enough to fill small gaps in the contact surfaces such as the spaces between the threads. If the coating thickness is too small, the effects of the components such as a resin-based material, wax, metal soap, or lubricating powder that is supplied to the friction surface from the interstices due to the hydrostatic pressure action that develops at the moment of constitution they can no longer be expected, and the resistance to roughness of a threaded joint worsens. In addition, when the lubricant coating contains a rust-preventing agent, the rust-preventing effect becomes inadequate. On the other hand, making the coating thickness too large is not only useless, it is also against the prevention of environmental pollution, which is one of the objectives of the present invention. When a viscous liquid lubricant coating is formed over a high friction solid lubricant coating 10 as a second lubricant coating 11 as shown in Figures 5 (B) and 5 (C), the total coating thickness of the high friction solid lubricant coating and of the viscous liquid lubricant coating is preferably at most 200 pm.
[SECOND SOLID LUBRICANT COAT] [00101] A solid lubricant coating that is used to form the second lubricant coating in the form of the second solid lubricant coating in the present invention is basically made up of a powder that has a solid lubricant action (referred to as a lubricating powder) and a binder. This coating can be formed by applying a dispersion that has a lubricating powder dispersed in a solution containing binder.
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29/60
The lubricating powder is strongly adhered to the surface of a threaded joint in a state where it is dispersed in the binder in the coating, and at the moment of constitution, it is stretched by the constitution pressure to a reduced thickness. As a result, it increases the roughness resistance of a threaded joint.
[00102] Examples of a lubricating powder include, but are not limited to, molybdenum disulfide, tungsten disulfide, graphite, fluorinated graphite, zinc oxide, tin sulfide, bismuth sulfide, organomolybdenum compounds (for example, a dialkylthiophosphate molybdenum or a molybdenum dialkylthiocarbamate), PTFE (polytetrafluoroethylene), and BN (boron nitride). One or more of these can be used.
[00103] From the viewpoints of adhesion and rust prevention properties of the solid lubricant coating, graphite is a particularly preferred lubricating powder, and from the point of view of film-forming properties, amorphous graphite is more preferred. A preferred content of lubricating powder in the solid lubricant coating is 2 to 15% by weight. In the present invention, it is necessary for the friction coefficient of the second solid lubricant coating to be less than the friction coefficient of the high friction solid lubricant coating. The friction coefficient of the second solid lubricant coating can be adjusted by the content of the lubricating powder. Consequently, as determined above, if the content of a lubricating powder becomes small, this type of solid lubricant coating can also be used as a high friction solid lubricant coating.
[00104] The binder can be an organic resin or an inorganic polymer.
[00105] The organic resin is preferably one that has heat resistance and adequate hardness and resistance to wear. Examples of such a resin are thermosetting resins such as epoxy resins, polyimide resins, polycarbodiimide resins, phenolic resins, furan resins, and silicone resins; and thermoplastic resins such as polyolefins, polystyrenes, polyurethanes, polyimides,
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30/60 polyesters, polycarbonates, acrylic resins, thermoplastic epoxy resins, polyamide-imide resins, polyether ether ketones, and polyether sulfones. The resin that is used can be a copolymer or a mixture of two or more resins.
[00106] When the binder is a thermosetting resin, from the point of view of adhesion and wear resistance of a solid thermoset lubricant coating, it is preferred to perform a thermal hardening treatment. The temperature of such heat curing treatment is preferably at least 120 ° C and more preferably 150 to 380 ° C, and the treatment time is preferably at least 30 minutes and more preferably 30 to 60 minutes.
[00107] When the binder is a thermoplastic resin, it is possible to employ a coating composition using a solvent, however it is also possible to form a solid thermoplastic lubricant coating without a solvent using the hot fusion method. In the hot melt method, a coating composition containing a thermoplastic resin and a lubricating powder is heated to melt the thermoplastic resin, and the composition that has become a low viscosity fluid is sprayed from a spray gun that has a temperature maintenance that maintains a constant temperature (usually a temperature that is approximately equal to the temperature of the composition in a molten state). The heating temperature of the composition is preferably 10 to 50 ° C higher than the melting point of the thermoplastic resin (the melting temperature is the softening point). In this method, it is appropriate to use a thermoplastic resin with a melting point of 80 to 320 ° C and preferably 90 to 200 ° C.
[00108] The substrate that is coated (that is, the contact surface of the pin and / or the box) is preferably preheated to a temperature higher than the melting point of the thermoplastic resin. As a result, it is possible to obtain satisfactory coating properties. When the coating composition contains a small amount (as a maximum of 2% in
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31/60 mass) of a surface active agent such as polydimethyl siloxane, it is possible to form a good quality coating even if the substrate is not preheated or even if the preheating temperature is lower than the set point. melting of the base resin. After coating, the thermoplastic resin is solidified by cooling the substrate by air cooling or natural cooling to form a solid lubricant coating on the substrate.
[00109] The inorganic polymer is a compound that has a three-dimensionally cross-linked structure of metal-oxygen bonds such as Ti-O, Si-O, Zr-O, Mn-O, Ce-O, or Ba-O. This compound can be formed by hydrolysis and condensation of a hydrolyzable organometallic compound with a metal alkoxide, although the hydrolyzable inorganic compound such as titanium tetrachloride can also be used. A preferred metal alkoxide that can be used is one that has lower alkoxy groups such as methoxy, ethoxy, isopropoxy, propoxy, isobutoxy, butoxy, or tert-butoxy groups. A preferred metal alkoxide is titanium or silicon alkoxide, and titanium alkoxide is particularly preferred. Among these, titanium isopropoxide is preferred due to its excellent film-forming properties.
[00110] The inorganic polymer can contain an alkyl group that can be replaced by a functional group such as an amine or epoxy group. For example, it is possible to use an organometallic compound in which some alkoxy groups are replaced by an alkyl group that contains a functional group as is the case with silane coupling agents and titanate coupling agents.
[00111] When the binder is an inorganic polymer, a lubricating powder is added to a solution of a metal alkoxide or a partial hydrolyzate thereof and dispersed therein, and the resulting composition is applied to the contact surface of at least one between a pin and a box. The resulting coating can be subjected to a humidifying treatment and then heated if necessary, thus allowing hydrolysis and condensation of the alkoxide
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32/60 metal to proceed and form a solid lubricant coating in which a lubricating powder is dispersed in a coating formed from an inorganic polymer that has metal-oxygen bonds.
[00112] Even when using any of the binders described above, when the coating composition contains a solvent, the solvent can be any one of water, a water miscible organic solvent like an alcohol, or a water immiscible organic solvent like a hydrocarbon or an ester. Two or more types of solvents can be used in combination.
[00113] In addition to a lubricating powder, various additives as a rust prevention agent can be added to the solid lubricant coating within a range that does not impair the resistance to flaking of the coating. For example, the rust-preventing properties of the solid lubricant coating itself can be enhanced by adding one or more between zinc powder, a chrome pigment, silica, and an alumina pigment. A particularly preferred rust prevention agent is calcium ion exchange silica. A solid lubricant coating can also contain an inorganic powder to adjust the sliding properties of the coating. Examples of this inorganic powder are titanium dioxide and bismuth oxide. These rust prevention agents, inorganic powders, and the like (ie, powder components except a lubricating powder) can be present in a total amount of up to 20% of the solid lubricant coating.
[00114] In addition to the above components, the solid lubricant coating may contain auxiliary additives selected from a surface active agent, a dye, an antioxidant, and the like in an amount of a maximum of 5%, for example. It is also possible to contain an extreme pressure agent, a liquid lubricant, or the like in a very small amount of maximum 2%.
[00115] For the same reasons as indicated by the viscous liquid lubricant coating, the thickness of the solid lubricant coating is preferably 5 to 150 µm and more preferably 20 to 100 µm. When the coating
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33/60 solid lubricant is formed over a high friction solid lubricant coating, the total thickness of the high friction solid lubricant coating and the solid lubricant coating is preferably at most 150 pm.
[SOLID ANTICORROSIVE COATING] [00116] As determined above in relation to Figure 4, during the time until the actual use of a tubular threaded joint, a protector is usually mounted on a pin or box that has not been connected to another element. It is necessary that a solid anticorrosive coating is not destroyed under at least one applied force during the assembly of a protector, is not dissolved even when exposed to water that condenses below the dew point during transport or storage, and not easily softened to high temperatures exceeding 40 ° C. Any coating that can satisfy these properties can be used as a solid anticorrosive coating. For example, a solid anticorrosive coating may be a thermosetting resin coating optionally containing a rust prevention component.
[00117] A preferred solid anticorrosive coating is a coating based on an ultraviolet curing resin. Known resin compositions comprising at least one monomer, an oligomer, and a photopolymerization initiator can be used as an ultraviolet curing resin.
[00118] Examples of monomers include, but are not limited to, polyvalent esters (di-, tri-, or higher) of a polyvalent alcohol with a (meth) acrylic acid, various (meth) acrylate compounds, N-vinylpyrrolidone, Nvinylcaprolactam, and styrene. Examples of oligomers include, but are not limited to, epoxy (meth) acrylates, urethane (meth) acrylates, (meth) polyester acrylates, (meth) polyester acrylates, (meth) polyether acrylates, and (meth) acrylates. silicone.
[00119] Useful light curing initiators are compounds that have an absorption in the wavelength range of 260 to 450 nm,
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34/60 including benzoin and its derivatives, benzophenone and its derivatives, acetophenone and its derivatives, Michler's ketone, benzyl and its derivatives, tetralkylthiuram monosulfide, thioxanes, and the like. It is particularly preferred to use a thioxane.
[00120] From the point of view of coating resistance and sliding properties, a solid anti-corrosion coating formed from an ultraviolet curing resin can contain an additive selected from a lubricant and / or a fibrous filler and a coating agent. rust prevention. Examples of a lubricant are metal soaps such as calcium stearate and zinc stearate, and polytetrafluoroethylene resin (PTFE). An example of a fibrous filler is acicular calcium carbonate such as Whiskal sold by Maruo Calcium Co., Ltd .. One or more of these additives can be added in an amount of 0.05 to 0.35 part by weight with respect to 1 part mass of ultraviolet curing resin. Examples of a rust prevention agent are aluminum tripolyphosphate and aluminum phosphite. This can be added in a maximum amount of about 0.10 part by weight compared to 1 part by mass of the ultraviolet curing resin.
[00121] A solid anticorrosive coating that is formed from an ultraviolet curing resin is generally transparent. From the point of view of facilitating the quality inspection of the resulting solid anti-corrosion coating both visually and by image processing (investigating whether there is a coating and the uniformity or non-uniformity of the coating thickness), the solid anti-corrosion coating may contain a dye . The dye that is used can be selected from pigments, dyes, and fluorescent materials. The amount of a dye is preferably at most 0.05 part by weight with respect to a part by mass of the ultraviolet curing resin.
[00122] A preferred dye is a fluorescent material. A fluorescent material can be any fluorescent pigment, fluorescent dye, and fluorophore used in fluorescent inks, but is preferably a pigment
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35/60 fluorescent. A solid anticorrosive coating that contains a fluorescent material is colorless or transparent with a color under visible light, but when it is irradiated with black light or ultraviolet rays, it exhibits fluorescence and becomes colored, making it possible to check for the presence of a coating or if there is irregularity in the coating. Furthermore, since it is transparent under visible light, the material under the solid anticorrosive coating, that is, the surface of the substrate can be observed. Consequently, inspection of damage to the threaded portions of the threaded joint is not prevented by a solid anti-corrosion coating.
[00123] After a composition based on an ultraviolet curing resin is applied to a contact surface of a threaded joint, it is irradiated with ultraviolet light to cure the coating, resulting in the formation of a solid anticorrosive coating based on a resin. of ultraviolet curing. Irradiation with ultraviolet light can use a commercially available ultraviolet light irradiation device that has an output wavelength in the range of 200 to 450 nm. Examples of an ultraviolet light source consist of a high pressure mercury vapor lamp, a high-high pressure mercury vapor lamp, a xenon lamp, a carbon arc lamp, a metal halide lamp, and sunshine.
[00124] The coating thickness of a solid anticorrosive coating (the total coating thickness when there are two or more layers of an ultraviolet curing resin) is preferably in the range of 5 to 50 pm and more preferably in the range of 10 to 40 pm . If the coating thickness of the solid anti-corrosion coating is too small, it does not function properly as an anti-corrosion coating. On the other hand, if the coating thickness of the solid anti-corrosion coating is too large, the solid anti-corrosion coating is sometimes destroyed under the assembly force when a protective element such as a protector is installed, and corrosion prevention ends up being inadequate.
[00125] A solid anticorrosive coating based on a resin of
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36/60 ultraviolet curing is a transparent coating, so the condition of the substrate can be observed through the coating without removing it, and it is possible to inspect the threaded portions before constitution from the top of the coating. Consequently, by forming the solid anti-corrosion coating on the contact surface of a pin, it is possible to easily inspect the damage of the threaded portion of the pin that is typically formed on the outer surface of one end of a steel tube and that is easily damaged.
[00126] As determined above with respect to the high friction solid lubricant coating, each viscous liquid lubricant coating, solid lubricant coating, and solid anticorrosive coating described above is preferably applied by spray coating. The spray coating includes a hot melt coating.
[00127] As shown in Figure 5 (A), when a solid, high-friction lubricating coating is formed on the non-threaded metallic contact portion of a contact surface and a second lubricating coating is formed on the threaded portion which is the remainder of the contact surface, the solid high-friction lubricant coating or the second lubricant coating can be formed first. In that case, particularly when the second lubricating coating is a solid lubricating coating, it is preferred to create the roughly equal thickness of the high friction solid lubricating coating and the solid lubricating coating (for example, within ± 15 pm) so that a large shoulder does not develop at the edge between the two types of lining. When the second lubricating coating is a viscous liquid lubricating coating, it has a great capacity to flow at the moment of constitution, so the second lubricating coating and the high friction solid lubricating coating can have a big difference in their thickness. Typically, the viscous liquid lubricant coating has a greater coating thickness than the high friction solid lubricant coating.
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37/60 [PREPARATORY SURFACE TREATMENT] [00128] In a tubular threaded joint according to the present invention in which a high friction solid lubricant coating and a second lubricant coating and in some cases also a solid anti-corrosion coating are formed on the contact surfaces of a pin and / or a box, if the preparatory surface treatment for surface roughness is carried out on the contact surfaces that are the substrate of the coatings so that the surface roughness is greater than 3 to 5 pm, this is the surface roughness after machining, the coating adhesion increases, and the desired effects of the coatings tend to increase. Consequently, before forming a coating, it is preferred to carry out a preparatory surface treatment on the contact surfaces to make the surfaces rough.
[00129] When a coating is formed on a contact surface that has a large surface roughness, the thickness of the coating is preferably greater than Rmax of the contact surface to completely cover the contact surface. When the contact surface is rough, the thickness of a coating is the average value of the total coating thickness that is calculated from the area, mass, and density of the coating.
[00130] Examples of preparatory surface treatment to make the surface rough consist of blasting treatment by protecting a blasting material such as spherical shot or angular shot, pickling by immersion in a strong acid such as sulfuric acid, hydrochloric acid, nitric acid, or acid hydrofluoric to roughen the surface, chemical conversion treatment such as phosphate treatment, oxalate treatment, or borate treatment (as the resulting crystals develop, the roughness of the crystalline surface increases), electroplating with a metal such as Cu, Fe , Sn, or Zn or an alloy of these metals (the projections are selectively galvanized, so the surface becomes slightly rough), and the
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38/60 impact galvanizing which can form a porous galvanized coating. As a type of electrogalvanization, composite galvanization that forms a galvanized coating in which small solid particles are dispersed in metal is possible as a method of conferring surface roughness, as small solid particles protrude from the galvanized coating. Preparatory surface treatment can use two or more methods in combination. Treatment can be carried out according to known methods.
[00131] Any preparatory surface treatment method is used for contact surfaces, the surface roughness Rmax produced by preparatory surface treatment to roughen the surface is preferably 5 to 40 pm. If Rmax is less than 5 pm, adhesion of a formed lubricant coating and retention of the coating may be inappropriate. On the other hand, if Rmax exceeds 40 pm, friction increases, the coating may be unable to withstand shear forces and compressive forces at high pressure, and the coating can be easily destroyed or peeled.
[00132] From the point of view of the adhesion of the lubricant coating, the preparatory surface treatment that can form a porous coating, that is, chemical conversion treatment and impact galvanizing are preferred. With these methods, to make Rmax of the coating porous at least 5 pm, the coating thickness is preferably at least 5 pm. There is no particular upper limit on the coating thickness, but normally a maximum of 50 pm and preferably a maximum of 40 pm is sufficient. If a lubricant coating is formed over a porous coating that is formed by preparatory surface treatment, the adhesion of the lubricant coating is increased by the so-called anchor effect. As a result, it becomes difficult to detach the solid lubricant coating under repeated constitution and rupture, contact between metals is effectively prevented, and resistance to flaking, gas tightness, and corrosion resistance
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39/60 are additionally increased.
[00133] Particularly preferred types of preparatory surface treatment to form a porous coating consist of chemical phosphate conversion treatment (treatment with manganese phosphate, zinc phosphate, manganese and iron phosphate, or calcium and zinc phosphate) and formation of a zinc or zinc-iron alloy coating by impact galvanizing. A manganese phosphate coating is preferred from an adhesion point of view, and a coating of zinc or zincferon alloy that provides a sacrificial zinc corrosion prevention effect can be expected to be preferred from the point of view of corrosion resistance.
[00134] Treatment by chemical conversion of phosphate (phosphating) can be carried out by immersion or spraying in a conventional manner. An acidic phosphating solution that is normally used for zinc-galvanized materials can be used as a chemical conversion treatment solution. For example, a zinc phosphating solution that contains 1 to 150 g / L of phosphate ions, 3 to 70 g / L of zinc ions, 1 to 100 g / L of nitrate ions, and 0 to 30 g / L of nickel ions can be used. It is also possible to use a manganese phosphate solution that is normally used for threaded joints. The temperature of the solution can be from room temperature to 100 ° C, and the treatment duration can be up to 15 minutes depending on the desired coating thickness. To promote the formation of a coating, before the phosphate treatment, an aqueous surface conditioning solution containing colloidal titanium can be supplied to the surface to be treated. After treatment with phosphate, washing is preferably carried out with cold or hot water followed by drying.
[00135] Impact galvanizing can be carried out by mechanical galvanizing in which the particles are impacted with a material that will be galvanized within a rotating barrel, or by sandblasting galvanizing in which the particles are impacted against a material that will be galvanized
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40/60 using a blasting machine. In the present invention, it is sufficient to galvanize only one contact surface, so it is preferred to employ blasting galvanizing which can perform localized galvanization. The thickness of a layer of zinc or zinc alloy that is formed by impact galvanizing is preferably 5 to 40 pm from the points of view of corrosion resistance and adhesion.
[00136] For example, particles that have an iron core coated with zinc or zinc alloy are blasted against the contact surface that will be coated. The content of zinc or a zinc alloy in the particles is preferably in the range of 20 to 60% by weight, and the diameter of the particles is preferably in the range of 0.2 to 1.5 mm. As a result of blasting, only the zinc or zinc alloy that is the coating layer of the particles adheres to the contact surface that forms a substrate, and a porous coating made of zinc or a zinc alloy formed on the contact surface. This impact galvanizing can form a galvanized porous metal coating that has good adhesion to a steel surface regardless of the composition of the steel.
[00137] As another type of preparatory surface treatment, although it has almost no roughening effect, electroplating in one or more specific layers can increase the adhesion of the lubricant coating to the substrate and can increase the resistance to flaking of a joint threaded tubular.
[00138] Examples of this preparatory surface treatment for a lubricant coating are electroplating with a metal such as Cu, Sn, or Ni or alloys of these metals. Galvanization can be single-layer or multi-layer galvanization with two or more layers. Specific examples of this type of electroplating are Cu galvanizing, Sn galvanizing, Ni galvanizing, CuSn alloy galvanizing, Cu-Sn-Zn alloy galvanizing, Cu galvanizing and Sn galvanizing in two layers, and galvanizing in three layers
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41/60 by plating with Ni, plating with Cu, and plating with Sn. In particular, a tubular threaded joint made of steel that has a Cr content that exceeds 5% is susceptible to flaking, and therefore is preferably subjected to preparatory surface treatment in the form of single-layer galvanization with a Cu alloy -Sn or a CuSn-Zn alloy or multilayer galvanizing with two or more layers selected from these alloy galvanizing and Cu galvanizing, Sn galvanizing, and Ni galvanizing as two-layer galvanizing with Cu galvanizing and galvanizing with Sn, galvanized in two layers for galvanizing with and galvanizing with Sn, galvanized in two layers by galvanizing with Ni and galvanizing with alloy of Cu-SnZn, and galvanizing in three layers by galvanizing with Ni, galvanizing with Cu, and galvanizing with Sn are preferred.
[00139] These types of galvanizing can be formed by the method described in JP 2003-74763 A. In the case of multi-layer galvanizing, the lowest galvanizing layer (usually Ni-plating) is preferably an extremely thin galvanizing layer referred to as electrolytic plating and has a thickness of less than 1 pm. The galvanizing thickness (the total thickness in the case of multi-layer galvanizing) is preferably in the range of 5 to 15 pm.
[00140] It is possible to form a solid anticorrosive coating as another method of preparatory surface treatment.
[00141] When the second lubricant coating is a viscous liquid lubricant coating, to reduce the surface adhesion of that coating, a thin dry solid coating (for example, with a thickness of 10 to 50 pm) can be formed as a top layer of the lubricant coating. This dry solid coating can be a normal resin coating (such as a coating of an epoxy resin, a polyamide resin, a polyamide-imide resin, or a vinyl resin) and it can be formed from a composition based on of water or a
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42/60 composition based on organic solvent. The coating may also contain a small amount of wax to provide lubricity.
EXAMPLES [00142] The effects of the present invention will be illustrated by the following examples and comparative examples. In the following explanation, the contact surface of a pin that includes the threaded portion and the non-threaded metallic contact portion will be referred to as the pin surface, and the contact surface of a box that includes the threaded portion and the contact portion unthreaded metal will be referred to as the box surface. The surface roughness is expressed as Rmax. Except where particularly specified,% means% by mass.
[00143] The commercially available special pin surface and screw joint surface (VAM TOP with an outside diameter of 17.78 cm (7 inches) and a wall thickness of 1.036 cm (0.408 inch) manufactured by Sumitomo Metal Industries, Ltd.) made of carbon steel A, Cr-Mo B steel, or 13% Cr C steel that has the composition shown in Table 1 were subjected to the preparatory surface treatment as shown in Table 2. Then, as shown in Table 3, a high friction solid lubricant coating and a second lubricant coating selected from a viscous liquid lubricant coating and a solid lubricant coating and sometimes a solid anti-corrosion coating are formed on the pin surface and the surface of Cashier.
[00144] Details of treatment and coating composition will be described below. In Table 3, the non-threaded metal contact portion means the sealing portion and the shoulder portion, and the threaded portion means the portion of the contact surface except the sealing portion and the shoulder portion. When different coatings are formed on the non-threaded metal contact portion and the threaded portion, first the high-friction solid lubricant coating is formed on the non-threaded metallic contact portion, and then the lubricant coating
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43/60 indicated is formed on the threaded portion. When a lubricant coating is formed on the threaded portion, a protective plate is used to not form the lubricant coating on the high friction solid lubricant coating that has been formed on the non-threaded metal contact portion. However, the margin between these coatings need not be transparent, and the effects of the present invention can be obtained even when there is an overlapping region of about 1 mm.
[00145] The friction coefficients of the high friction solid lubricant coating, the viscous liquid lubricant coating, and the solid lubricant coating that have been formed are the maximum friction coefficients under fixed state conditions when the friction coefficients are measured by the Falex test mentioned above with a pressure of 1 GPa. The measurement was performed according to ASTM D2670. The pin used for the measurement has a diameter of 6.35 mm (1/4 inch), and 2 V-blocks have a V-shaped notch with an included angle of 96 ° and a notch width of 6.35 mm (1/4 inch). The pin and blocks were prepared by cutting them from a billet of the same steel as the threaded joint to be tested, and these were subjected to the same preparatory surface treatment and coating treatment as the surface of the pin and the box, respectively , of the threaded joint to be tested.
[00146] A high torque test in which the constitution was performed with a high constitution torque was carried out on a threaded tubular joint that was prepared in the manner described above to obtain a torque graph like the one shown in Figure 2. The values of Ts (the shoulder support torque), Ty (the yield torque), and AT (the torque shoulder resistance = Ty - Ts) were measured on the torque graph.
[00147] Ts is the torque at the beginning of interference of the shoulder portions. Specifically, Ts is the torque when the torque change appeared when the interfered shoulder portions started to enter a linear region (region of elastic deformation). Ty is the torque at the beginning of plastic deformation.
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Specifically, Ty is the torque when the torque starts to leave the linear region after Ts is reached in which the torque change with the number of turns becomes linear. ÁT (= Ty - Ts) became 100 in Comparative Example 1 in Table 3 using a conventional compound grease. Table 4 shows the results 5 of comparing other examples with this value of AT.
[00148] A test of repeated constitution and rupture was carried out on each threaded tubular joint, and the resistance to flaking was evaluated. In the constitution and rupture test, the constitution of a threaded joint was carried out with a constitution speed of 10 rpm and a high torque of 10 constitution of 20 kN-m, and after the rupture, the state of flaking of the pin surface and of the box surface was investigated. In those cases where risks of binding that have developed due to the constitution are light and repeated constitution is possible if the repair is carried out, the repair has been carried out and the constitution and rupture have continued. The constitution was performed 10 times 15 (during 10 cycles). Table 4 also shows the results of this test.
TABLE 1
Brand Threaded joint steel composition (% by mass, remainder: Fe and impurities) Ç Si Mn P s Ass Ni Cr Mo THE 0.24 0.3 1.3 0.02 0.01 0.04 0.07 0.17 0.04 B 0.25 0.25 0.8 0.02 0.01 0.04 0.05 0.95 0.18 Ç 0.19 0.25 0.8 0.02 0.01 0.04 0.1 13 0.04
TABLE 2
At the. Preparatory surface treatment Steel brand Pin Cashier Example 1 1. Milling machine (R = 3)2. Zn phosphating (R = 8) (t = 12) 1. Milling machine(R = 3)2. phosphating of Mn (R = 12) (t = 15) THE Example2 Sandblasting (R = 10) 1. Milling machine (R = 3)2. electroplating with Ni electrolytic bath + electroplating with Cu(R = 3) (t = 12) Ç
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Example3 1. Milling machine(R = 3)2. Zn phosphating (R = 8) (t = 12) 1. Milling machine (R = 3)2. electroplating with Ni electrolytic bath + electroplating with Cu-Sn-Zn alloy(R = 2) (t = 7) B Example4 1. Milling machine(R = 3)2. Zn phosphating (R = 8) (t = 12) 1. Milling machine (R = 3)2. electroplating with Ni electrolytic bath + electroplating with Cu-Sn-Zn alloy(R = 2) (t = 7) B Compar. Example 1 1. Milling machine(R = 3)2. Zn phosphating (R = 8) (t = 12) 1. Milling machine(R = 3)2. Mn phosphating (R = 12) (t = 15) THE Compar. Example 2 1. Milling machine(R = 3)2. Zn phosphating (R = 8) (t = 12) 1. Milling machine(R = 3)2. Mn phosphating (R = 10) (t = 12) B Compar. Example 3 1. Milling machine(R = 3)2. Zn phosphating (R = 8) (t = 12) 1. Milling machine(R = 3)2. Mn phosphating (R = 10) (t = 12) B Compar. Example 4 1. Milling machine(R = 3)2. Zn phosphating (R = 8) (t = 12) 1. Milling machine(R = 3)2. Mn phosphating (R = 10) (t = 12) B Compar. Example 5 1. Milling machine(R = 3)2. Zn phosphating (R = 8) (t = 12) 1. Milling machine(R = 3)2. Mn phosphating (R = 10) (t = 12) B
R: surface roughness (pm); t: coating thickness (pm)
TABLE 3
At the. Layer Pin Cashier Non-threaded metal contact portion Threaded portion Non-threaded metal contact portion Threaded portion Example 1High friction solid lubricant coating Viscous liquid lubricant coating High friction solid lubricant coating Viscous liquid lubricant coating Example2 Bottom High solid lubricant coatingViscous liquid lubricant coating
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friction Higher Viscous liquid lubricant coating Example3 Bottom High friction solid lubricant coatingViscous liquid lubricant coating Higher High friction solid lubricant coating Example4 - UV-curable solid anti-corrosion coating High friction solid lubricant coating Solid lubricant coating Ex.Comp. 1 - Compound grease in the form of viscous liquid according to API BUL 5A2 Ex.Comp. 2 - Viscous liquid lubricant coating Viscous liquid lubricant coating Ex.Comp. 3 - UV-curable solid anti-corrosion coating Solid lubricant coating Ex.Comp. 4 - High friction solid lubricant coating Viscous liquid lubricant coating Ex.Comp. 5 - UV-curable solid anti-corrosion coating High friction solid lubricant coating
TABLE 4
At the. AT ratio (= Ty - Ts) 1) (Relative value when the Repeated build and break test results at high torque for 10 cycles valueCompa do rativo 1 f Example or 100) Example 1 125 no flakingfor 10 cycles Example 2 112 no flakingfor 10 cycles Example 3 110 no flakingfor 10 cycles Example 4 105 no flakingfor 10 cycles Ex. Compar. 1 100 no flakingfor 10 cycles Ex. Compar. 2 52 no flakingfor 10 cycles Ex. Compar. 3 70 no flakingfor 10 cycles Ex. Compar. 4 61 flaking occurred in the 5th cycle Ex. Compar. 5 not evaluable flaking occurred in the 1st cycle
1) A value of at least 95 is acceptable for practical use.
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47/60 (EXAMPLE 1) [00149] The pin surface and the box surface of a special threaded joint made of carbon steel having the composition A shown in Table 1 were subjected to the preparatory surface treatment and the coating treatment as described below to form the coating structure shown in Figure 5 (A).
[BOX SURFACE] [00150] After finishing by grinding machine (surface roughness of 3 pm), the box surface was subjected to the preparatory surface treatment by immersion for 10 minutes in a manganese phosphate solution at 80 to 95 ° C to form a manganese phosphate coating that has a thickness of 15 pm (surface roughness of 12 pm).
[00151] Surflube C291 manufactured by Nippon Paint Co., Ltd. which was diluted with water to a concentration of 10% was applied by spray coating to the non-threaded metallic contact portion (the sealing portion and the shoulder portion) of box surface that has undergone preparatory surface treatment to form a solid high-friction lubricant coating with a coating thickness of approximately 10 pm after drying. The friction coefficient of this solid lubricant coating is 0.1. The threaded portion (the portions except the sealing portion and the shoulder portion) of the box surface that was subjected to the preparatory surface treatment was treated to form a viscous liquid lubricant coating in the following manner.
[00152] The composition of the viscous liquid lubricant coating is 15% of a hydrogenated resin ester (Ester Gum H manufactured by Arakawa Chemical Industries, Ltd.), 48% of a highly basic calcium sulfonate as a basic metal salt of a aromatic organic acid (CalcinatoeC-400CLR manufactured by Crompton Corporation, base number 400 mg KOH / g), 17% calcium stearate as a metal soap (manufactured by DIC Corporation),
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10% amorphous graphite as a solid lubricant (Blue P manufactured by Nippon Graphite Industries, Ltd.), and 10% paraffin wax.
[00153] After the composition described above is diluted with 30 parts by weight of an organic solvent (Exxsol D40 manufactured by Exxon Mobil Corporation) per 100 parts by weight of the composition to reduce its viscosity, it was applied to the threaded portion of the box surface by spray coating. After evaporation of the solvent, a viscous liquid lubricating coating having a thickness of approximately 50 pm was formed. The friction coefficient of this lubricant coating is 0.04.
[PIN SURFACE] [00154] After finishing by grinding machine (surface roughness of 3 pm), the pin surface was subjected to the preparatory surface treatment by immersion for 10 minutes in a solution of zinc phosphating at 75 a 85 ° C to form a zinc phosphate coating (surface roughness of 8 pm) with a thickness of 12 pm.
[00155] The same treatment of the box surface to form the lubricating coatings was carried out on the pin surface that was subjected to the preparatory surface treatment. That is, the high-friction solid lubricant coating described above was formed on the unthreaded metallic contact portion, and the viscous liquid lubricant coating described above was formed on the threaded portion. The coating thickness and the friction coefficient of each coating are the same for the housing surface.
[00156] As can be seen from Table 4, the value of ΔΤ in a high torque test is such that the ratio of ΔΤ when the value of ΔΤ in Comparative Example 1 adopts a value of 100 (referred to below as the ratio ΔΤ) is 125%. Compared to the ΔΤ ratio of about 50% for Comparative Example 2 which does not have a high friction solid lubricant coating on the sealing portion or the shoulder portion (the entire pin surface and the housing surface have been coated with a liquid lubricant coating
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49/60 viscous), the ΔΤ ratio was greatly increased.
[00157] Furthermore, ΔT in Example 1 was increased by 25% in relation to ΔT in the reference example that uses compound grease (Comparative Example 1). Consequently, it was found that the threaded joint of Example 1 could be formed with a high torque without the flow of shoulder portions occurring. In the repeated constitution and rupture test, constitution and rupture could be performed 10 times without the occurrence of flaking.
(EXAMPLE 2) [00158] The pin surface and the box surface of a special threaded joint made of 13% Cr steel having the composition C shown in Table 1 were subjected to the preparatory surface treatment and the coating treatment described above to form the coating structure shown in Figure 5 (C).
[BOX SURFACE] [00159] After finishing by grinding machine (surface roughness of 3 pm), the box surface is electroplated with Ni electrolytic bath and then electroplated with Cu electroplating to form a galvanized coating with a total thickness of 12 pm. The surface roughness after this preparatory surface treatment is 3 pm.
[00160] The same viscous liquid lubricant coating described in Example 1 was formed by spray coating over the entire box surface that was subjected to the preparatory surface treatment. The coating thickness of the viscous liquid lubricant coating after evaporation of the solvent is 80 pm, and its friction coefficient is 0.04.
[PIN SURFACE] [00161] The pin surface was subjected to the preparatory surface treatment by sandblasting with No. 80 sand to provide a surface roughness of 10 pm.
[00162] Gardolube L6334 undiluted manufactured by Chemetall GmbH was
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50/60 applied by spray coating to the non-threaded metallic contact portion (the sealing portion and the shoulder portion) of the pin surface that has undergone preliminary surface treatment to form a high-friction solid lubricant coating with a thickness approximately 15 pm. The friction coefficient of this high friction solid lubricant coating is 0.15. The same viscous liquid lubricant coating formed on the housing surface was formed in the same coating thickness over the entire pin surface which includes the non-threaded metallic contact portion on which the high friction solid lubricant coating was formed.
[00163] In the high torque test, the ΔΤ ratio is 112%, confirming that ΔΤ is greater than in Comparative Example 1 which used compound grease. Naturally, constitution and rupture could be performed 10 times without any problem in the repeated constitution and rupture test.
(EXAMPLE 3) [00164] The pin surface and the housing surface of a special threaded joint made of Cr-Mo steel having the composition B shown in Table 1 were subjected to the preparatory surface treatment and coating treatment described below for form the coating structure shown in Figure 6 (C).
[BOX SURFACE] [00165] After finishing by grinding machine (surface roughness of 3 pm), the box surface subjected to electroplating with Ni electrolytic bath followed by electroplating of Cu-Sn-Zn alloy for electroplating to form a galvanized coating that has a total thickness of 7 pm. The surface roughness after the preparatory surface treatment is 2 pm.
[00166] The non-threaded metallic contact portion and the threaded portion of the box surface that were subjected to the preparatory surface treatment were coated by spray coating with
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Surflube C291 manufactured by Nippon Paint Co., Ltd. which was diluted with water to a concentration of 10% to form a high friction solid lubricant coating (friction coefficient of 0.1) with a coating thickness of approximately 10 pm after drying.
[PIN SURFACE] [00167] After finishing by grinding machine (surface roughness of 3 pm), the pin surface was immersed for 10 minutes in a zinc phosphating solution at 75 to 85 ° C for the treatment of preparatory surface to form a zinc phosphate coating (surface roughness of 8pm) with a thickness of 12 pm.
[00168] The non-threaded metallic contact portion of the pin surface that was subjected to the preparatory surface treatment was coated by spray coating with Surflube C291 manufactured by Nippon Paint Co., Ltd. which was diluted with water to a concentration of 10 % to form a high friction solid lubricant coating with a coating thickness of approximately 10 pm (friction coefficient of 0.1) after drying. Then, the viscous liquid lubricant coating described in Example 1 was formed on the solid lubricant coating and on the threaded portion (i.e., the entire pin surface) by the same method as in Example 1 at a coating thickness of approximately 50 pm.
[00169] In the high torque test, the ratio of ΔΤ is 110%, confirming that ΔΤ is greater than that of the compound grease of Comparative Example 1. In the repeated constitution and rupture test, constitution and rupture were performed 10 times without any problem.
(EXAMPLE 4) [00170] The pin surface and the box surface of a special threaded joint made of Cr-Mo steel having the composition B shown in Table 1 were subjected to the preparatory surface treatment and coating treatment described below to form a coating with the structure shown in Figure 6 (B).
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52/60 [BOX SURFACE] [00171] After finishing by grinding machine (surface roughness of 3 pm), the box surface subjected to electroplating with Ni electrolytic bath followed by electroplating of Cu-Sn-Zn alloy by electroplating to form a galvanized coating with a total thickness of 7 pm. The surface roughness after the preparatory surface treatment is 2 pm.
[00172] The non-threaded metallic contact portion of the box surface that was subjected to the preparatory surface treatment was coated by spray coating with Surflube C291 manufactured by Nippon Paint Co., Ltd. which was diluted with water to a concentration of 10 % to form a solid, high-friction lubricant coating (friction coefficient of 0.1) with a coating thickness of approximately 50 pm after drying. On the threaded portion of the box surface that was subjected to the preparatory surface treatment, a solid lubricant coating was formed as follows.
[00173] A lubricant coating composition that has the composition described below was heated to 120 ° C in a tank equipped with a stirrer to maintain a molten state that has a suitable viscosity for the coating, while the box surface that was subjected to preparatory surface treatment described above was preheated to 120 C by induction heating. Using a spray gun that has a spray head with a heat retention mechanism, the molten lubricant coating composition described above was applied to the threaded portion of the preheated housing surface. After cooling, a solid lubricating coating with a thickness of 50 pm (friction coefficient of 0.03) was formed.
[00174] The composition of the lubricant coating composition is as follows:
15% carnauba wax,
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15% zinc stearate,
5% liquid polyalkyl methacrylate (ViscoplexTM 6-950 manufactured by Rohmax Corporation),
49% corrosion inhibitor (NA-SULTM Ca / W1935 manufactured by King Industries, Inc.),
3.5% amorphous graphite
1% zinc oxide,
5% titanium dioxide,
5% bismuth trioxide,
1% silicone (polydimethyl siloxane), and antioxidants (manufactured by Ciba-Geigy Corporation):
0.3% IrganoxTM L150 and
0.2% IrgafosTM 168.
[PIN SURFACE] [00175] After milling machine finish (3 pm surface roughness), the pin surface was immersed for 10 minutes in a zinc phosphating solution at 75 to 85 ° C to form a coating zinc phosphate (surface roughness of 8 pm) with a thickness of 12 pm. Over the entire pin surface that was subjected to the preparatory surface treatment, a solid anticorrosive coating was formed from an ultraviolet curing resin in the following manner.
[00176] A coating composition was prepared by adding aluminum phosphate and zinc as a rust prevention agent and polyethylene wax as a lubricant to an ultraviolet curing resin paint composition based on epoxy acrylic resin (type without solvent ) manufactured by Chugoku Marine Paints, Ltd. The resulting coating composition contains 94% resin, 5% rust prevention agent, and 1% lubricant based on the total solids content. This coating composition was applied by spraying the entire pin surface and was irradiated with ultraviolet rays (wavelength 260 nm) from a mercury vapor lamp
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54/60 air-cooled which has a 4 kW output to cure the coating. The resulting coating has a thickness of 25 pm and is colorless and transparent. The male threaded portion of the pin could be inspected through the coating with the naked eye or with a magnifying glass.
[00177] In the high torque test, the ΔΤ ratio is 105%. The ratio of ΔΤ is greatly increased compared to Comparative Example 3 in which a high-friction solid lubricant coating is not formed on the non-threaded metallic contact portion (the sealing portion and the shoulder portion) of the housing surface. In addition, the ratio of ΔΤ is increased compared to t Comparative Example 1 which uses a conventional compound grease. In the repeated constitution and rupture test, constitution and rupture could be performed 10 times without any problem.
(COMPARATIVE EXAMPLE 1) [00178] The pin surface and the box surface of a special threaded joint made of carbon steel having composition A shown in Table 1 were subjected to the preparatory surface treatment and coating treatment described below .
[BOX SURFACE] [00179] After finishing by a shredding machine (surface roughness of 3 pm), the box surface submitted to the preparatory surface treatment by immersion for 10 minutes in a manganese phosphate solution at 80 to 95 ° C to form a 15 pm thick manganese phosphate coating (12 pm surface roughness). A viscous liquid composite grease according to API BUL 5A2 was applied to the box surface that was subjected to this preparatory surface treatment to form a lubricant coating. The coated amount of the compound grease is a total of 50 g on the pin and the box. The coated area is a total of approximately 1400 cm2.
[PIN SURFACE] [00180] After finishing by grinding machine (roughness of
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55/60 3 pm surface), the pin surface was immersed for 10 minutes in a zinc phosphating solution at 75 to 85 ° C to form a zinc phosphate coating (8 pm surface roughness) with a thickness from 12 pm. The same compound grease used on the box surface was applied to the pin surface that was subjected to this preparatory surface treatment.
[00181] As shown in Table 3, during 10 constitution and rupture cycles in the repeated constitution and rupture test, no flaking occurred until the tenth cycle. However, compound grease contains heavy metal like lead, so it is harmful to humans and the environment.
[00182] In the high torque test, the joint exhibited a high value of Ty with a large value of ΔΤ thus the flow of the shoulder portions did not occur even when the constitution was performed with a high torque. The ratio values of ΔΤ in the other examples were calculated with the value of ΔΤ at that time performed in 100.
(COMPARATIVE EXAMPLE 2) [00183] The pin surface and the housing surface of a special threaded joint made of Cr-Mo steel having composition B in Table 1 were subjected to the following preparatory surface treatment and coating treatment.
[BOX SURFACE] [00184] After finishing by grinding machine (surface roughness of 3 pm), the box surface was immersed for 10 minutes in a manganese phosphate solution at 80 to 95 ° C to form a coating of manganese phosphate with a thickness of 12 pm (surface roughness of 10 pm). The viscous liquid lubricant coating described in Example 1 was formed by the same method over the entire box surface that was subjected to this preparatory surface treatment. After evaporation of the solvent, a viscous liquid lubricating coating with a thickness of approximately 60 pm was formed. The friction coefficient of this lubricant coating is 0.04.
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56/60 [PIN SURFACE] [00185] After finishing by grinding machine (surface roughness of 3 pm), the pin surface was immersed for 10 minutes in a zinc phosphating solution at 75 to 85 ° C for form a zinc phosphate coating (surface roughness of 8 pm) with a thickness of 12 pm. The same viscous liquid lubricant coating that is on the box surface was formed to a thickness of 60 pm over the entire pin surface that was subjected to the preparatory surface treatment.
[00186] In the repeated constitution and rupture test, the results were extremely satisfactory without flaking in 10 cycles of constitution and rupture. However, in the high torque test, the ΔΤ ratio is an extremely small value of 52% compared to conventional composite grease (Comparative Example 1). That is, it has again been confirmed that if the contact surfaces of a tubular threaded joint are fully coated with only a viscous liquid lubricant coating with a low friction coefficient, the ratio of ΔΤ is significantly reduced.
(COMPARATIVE EXAMPLE 3) [00187] The pin surface and the box surface of a special threaded joint made of Cr-Mo steel having composition B in Table 1 were subjected to the following preparatory surface treatment and coating treatment.
[BOX SURFACE] [00188] After finishing by grinding machine (surface roughness of 3 pm), the box surface submitted to the preparatory surface treatment by immersion for 10 minutes in a manganese phosphate solution at 80 to 95 ° C to form a manganese phosphate coating with a thickness of 12 pm (surface roughness of 10 pm). The same solid lubricant coating described in Example 4 was formed by the same method over the entire box surface that was subjected to the preparatory surface treatment. After cooling, a solid lubricant coating
Petition 870190083806, of 27/08/2019, p. 127/191
57/60 with a thickness of approximately 50 pm (friction coefficient of 0.03) was formed.
[PIN SURFACE] [00189] After finishing by milling machine (3 pm surface roughness), the pin surface was immersed for 10 minutes in a zinc phosphating solution at 75 to 85 ° C to form a coating zinc phosphate (surface roughness of 8 pm) with a thickness of 12 pm. The same ultraviolet curing resin coating (coating thickness of 25 pm) described in Example 4 was formed by the same method over the entire pin surface that was subjected to the preparatory surface treatment.
[00190] In the test of repeated constitution and rupture, the results were extremely satisfactory without the occurrence of flaking in 10 cycles of constitution and rupture. However, in the high torque test, the ΔΤ ratio is an extremely small value of 70% compared to conventional composite grease.
(COMPARATIVE EXAMPLE 4) [00191] The pin surface and the box surface of a special threaded joint made of Cr-Mo steel having composition B in Table 1 were subjected to the following preparatory surface treatment and coating treatment.
[BOX SURFACE] [00192] After finishing by grinding machine (surface roughness of 3 pm), the box surface was immersed for 10 minutes in a manganese phosphate solution at 80 to 95 ° C to form a coating of manganese phosphate with a thickness of 12 pm (surface roughness of 10 pm). The same viscous liquid lubricant coating described in Example 1 was formed by the same method over the entire box surface that was subjected to this preparatory surface treatment. After evaporation of the solvent, a viscous liquid lubricating coating with a thickness of approximately 60 pm was formed. The friction coefficient of this coating
Petition 870190083806, of 27/08/2019, p. 128/191
58/60 lubricant is 0.04.
[PIN SURFACE] [00193] After finishing by grinding machine (surface roughness of 3 pm), the pin surface was immersed for 10 minutes in a zinc phosphating solution at 75 to 85 ° C to form a coating of zinc phosphate (surface roughness of 8 pm) with a thickness of 12 pm. The same high-friction solid lubricant coating formed on the non-threaded metallic contact portion of the pin surface in Example 1 was formed to a thickness of 10 pm over the entire pin surface that was subjected to the preparatory surface treatment.
[00194] In the repeated constitution and rupture test, the constitution torque is constantly high since the first cycle, and flaking occurred in the fifth cycle making it unable to continue the test. In the high torque test, the ratio of ΔΤ is a small value of 61% compared to conventional composite grease (Comparative Example 1). That is, when the entire contact surface of a threaded joint element is coated with a solid, high-friction lubricant coating, the peeling resistance is greatly compromised, and due to a considerable increase in shoulder torque, the ratio of ΔΤ has not been improved.
(COMPARATIVE EXAMPLE 5) [00195] The pin surface and the box surface of a special threaded joint made of Cr-Mo steel having composition B in Table 1 were subjected to the following preparatory surface treatment and coating treatment.
[BOX SURFACE] [00196] After finishing by grinding machine (surface roughness of 3 pm), the box surface was immersed for 10 minutes in a manganese phosphate solution at 80 to 95 ° C to form a coating of manganese phosphate with a thickness of 12 pm (surface roughness of 10 pm). The same high friction solid lubricant coating formed on
Petition 870190083806, of 27/08/2019, p. 129/191
59/60 the non-threaded metallic contact portion of the box surface in Example 4 was formed to a thickness of about 20 pm over the entire box surface that was subjected to the preparatory surface treatment.
[PIN SURFACE] [00197] After finishing by milling machine (surface roughness of 3 pm), the pin surface was immersed for 10 minutes in a zinc phosphating solution at 75 to 85 ° C to form a coating zinc phosphate (surface roughness of 8 pm) with a thickness of 12 pm. The same coating of ultraviolet curing resin (coating thickness of 25 pm) described in Example 4 was formed by the same method over the entire pin surface that was subjected to the preparatory surface treatment.
[00198] In the repeated constitution and rupture test, flaking occurred in the first cycle, and the test ended. This premature peeling made it unable to be evaluated by the high torque test. It has been confirmed that the combination of coatings in this example provides unsatisfactory lubricity resulting in a significant worsening of peeling resistance, which is the fundamental performance required for a tubular threaded joint.
(OTHER TESTS) [00199] To investigate the rust prevention properties of the tubular threaded joints manufactured in Examples 1 to 4, the same preparatory surface treatment and formation of lubricant coating or coatings in the box in Table 2 were performed on a piece of separately prepared test (70 mm x 150 mm x 1.0 mm thick). Each test piece was subjected to a salt spray test (according to JIS Z 2371 (corresponding to ISO 9227) at a temperature of 35 ° C for 1000 hours) or a moisture resistance test (according to JIS K 56007-2 (corresponding to ISO 6270) at a temperature of 50 ° C and a relative humidity of 98% for 200 hours), and the occurrence of rust was investigated. As a result, it was found that there was no rust on the tubular threaded joints of Examples 1 to 4 in each test.
Petition 870190083806, of 27/08/2019, p. 130/191
60/60 [00200] When each example of a tubular threaded joint is subjected to a gas tightness test and an actual usage test on a real excavation apparatus, each joint exhibits satisfactory properties. It was confirmed that the constitution could be stably carried out with these joints even when the constitution torque is high due to the ΔΤ values that are higher than with the conventionally used compound grease.
Petition 870190083806, of 27/08/2019, p. 131/191

权利要求:
Claims (5)
[1]
1. Tubular threaded joint consisting of a pin (1) and a housing (2) each having a contact surface comprising a non-threaded metallic contact portion that includes a sealing portion (4a, 4b) and a portion of shoulder (5a, 5b) and a threaded portion (3a, 3b), where the contact surface of at least one between the pin (1) and the housing (2) has a first lubricant coating (10) and a second coating lubricant (11), the first lubricant coating (10) being a solid lubricant coating formed on a portion of the contact surface that includes the shoulder portion (5a, 5b), the second lubricant coating (11) is selected from of a viscous liquid lubricating coating and a solid lubricating coating formed at least on the portion of the contact surface where the first lubricating coating (10) is not present, the first lubricating coating (10) has a coefficient aware of friction that is greater than that of the second lubricating coating (11), the second lubricating coating (11) is positioned at the top if there is a portion of the contact surface where the first lubricating coating (10) and the second lubricating coating ( 11) are present, CHARACTERIZED by the fact that the portion of the contact surface that includes the shoulder portion (5a, 5b) on which the first lubricant coating (10) is formed is a non-threaded metallic contact portion of the contact, and that the non-threaded metallic contact portion of the contact surface of at least one between the pin (1) and the housing (2) has the first lubricant coating (10) and the entire contact surface has the second lubricant coating (11) formed on the first lubricant coating (10).
[2]
2. Tubular threaded joint, according to claim 1, CHARACTERIZED by the fact that the contact surface of at least one between the pin (1) and the housing (2) is subjected to the surface treatment by a method selected from blasting, pickling, chemical phosphate conversion treatment, chemical oxalate conversion treatment,
Petition 870190083806, of 27/08/2019, p. 67/191
2/2 treatment by chemical conversion of borate, electroplating, impact galvanizing, and two or more of these methods before the formation of the lubricant coating.
[3]
3. Tubular threaded joint, according to claim 1 or 2, CHARACTERIZED by the fact that the first lubricant coating (10) has a thickness of 5 to 40 pm.
[4]
4. Tubular threaded joint, according to claim 3, CHARACTERIZED by the fact that the second lubricating coating (11) is a viscous liquid lubricating coating that has a thickness of 5 to 200 pm, and when that second lubricating coating (11) to be positioned over the first lubricating coating (10), the total thickness of the first lubricating coating (10) and the second lubricating coating (11) is at most 200 pm.
[5]
5. Tubular threaded joint, according to claim 3, CHARACTERIZED by the fact that the second lubricant coating (11) is a solid lubricant coating that has a thickness of 5 to 150 pm, and when that second lubricant coating (11) becomes positioned on the first lubricant coating (10), the total thickness of the first lubricant coating (10) and the second lubricant coating (11) is at most 150 pm.

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同族专利:

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BR112014008612C8|2020-06-02|

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UA111250C2|2016-04-11|

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法律状态:
2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-07-02| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|

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2019-09-03| B25D| Requested change of name of applicant approved|Owner name: VALLOUREC OIL AND GAS FRANCE (FR) ; NIPPON STEEL C Owner name: VALLOUREC OIL AND GAS FRANCE (FR) ; NIPPON STEEL CORPORATION (JP) |

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2019-09-17| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2019-11-12| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 16/11/2012, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 16/11/2012, OBSERVADAS AS CONDICOES LEGAIS |

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2020-04-22| B09W| Decision of grant: rectification|Free format text: REFERENTE A RPI 2541 DE 17/09/2019 |

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2020-04-28| B16C| Correction of notification of the grant|Free format text: REFERENCIA: RPI 2549 DE 12.11.2019 REFERENTE AOS DESENHOS |

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2020-06-02| B16C| Correction of notification of the grant|Free format text: REF. RPI 2546 DE 12/11/2019 QUANTO AO RELATORIO DESCRITIVO. |

优先权:

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申请号 | 申请日 | 专利标题

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JP2011253187A|JP5722752B2|2011-11-18|2011-11-18|Tubular threaded joint with excellent high-torque fastening performance|

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PCT/JP2012/080403|WO2013073712A1|2011-11-18|2012-11-16|Tubular threaded joint having improved high torque performance|

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