• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Provided is an apparatus, which is provided between the surface of a plating bath for hot-dip plating and air knife equipment for controlling the thickness of plating metal attached to the surface of a strip, so as to form a nitrogen cloud (curtain) along the periphery of the strip rising from the plating bath. The apparatus of the present invention: has a semicylinder-shaped body spaced at a predetermined distance from the surface of the plating bath and of which the bottom surface is opened so as to face the surface of the plating bath; has a slit, through which the strip passes, formed on the upper surface of the body; has a lower gas exhaust part formed along the periphery of the lower end portion of the body, and spraying nitrogen gas toward the surface of the plating bath so as to block external air; includes inner gas exhaust parts arranged at both sides of the strip so as to face each other, while traversing the bottom surface of the body in the width direction of the strip, so as to spray the nitrogen gas toward the strip; and has a plurality of spray nozzles, formed at the inner side of the body, for spraying the nitrogen gas toward the strip.
    公开号:ES2725126A2
    申请号:ES201890066
    申请日:2016-05-27
    公开日:2019-09-19
    发明作者:Byung Moon Lim；Byung Sun Moon；Young Keun Song；Ick Seok Choi
    申请人:DONGKUK STEEL MILL CO Ltd；
    IPC主号:
    专利说明:

    [0001]
    [0002] APPARATUS FOR FORMING A NITROGEN CLOUD TO MANUFACTURE A HOT IMMERSION COATED STEEL SHEET WITH EXCELLENT QUALITY OF THE SURFACE AND METHOD FOR MANUFACTURING A HOT COVERED STEEL PLATE AND ALUMINUM TO USE
    [0003]
    [0004] OBJECT OF THE INVENTION
    [0005]
    [0006] The present invention, as stated in the statement, refers to an apparatus for forming a nitrogen cloud for manufacturing a hot dipped coated steel sheet with excellent surface quality and method for manufacturing a hot dipped coated steel sheet zinc and aluminum using the same device, more specifically, refers to an apparatus that effectively forms a non-oxidizing atmosphere to block an ambient air by a steel plate coated in a device that coats a metal by hot dipping such as zinc or aluminum on a steel plate, and with a method that manufactures a hot-dipped zinc-aluminum coated steel sheet using the same apparatus.
    [0007] The main object of the invention is to provide an apparatus for forming a non-oxidizing atmosphere on a steel sheet that comes from a surface of a coating bath when producing a hot dipped coated steel sheet, and a method for produce a hot-dipped zinc-aluminum coated steel sheet using said apparatus.
    [0008]
    [0009] BACKGROUND OF THE INVENTION
    [0010]
    [0011] A steel sheet with a hot dip metal coating is generally used in an attempt to get a base steel sheet to obtain corrosion resistance. Normally, a zinc coated steel sheet (GI) is generally used due to its economic efficiency and the abundance of this resource. It is currently one of the most used types of coated steel sheet. In addition, there is a considerable body of research to improve the corrosion resistance of zinc-coated steel sheets. Specifically, an aluminum-coated steel plate (called Galvalume) was proposed at the end of the sixties, which has a 55% aluminum and zinc content and currently presents superior corrosion resistance and a beautiful appearance. .
    [0012] Said aluminum coated steel sheet has superior corrosion resistance and thermal resistance compared to the coated steel sheets of zinc. Therefore, it is generally applied to car silencers, appliances, heat-resistant materials and the like.
    [0013] For example, Japanese Patent Publication with Publication Number 57 47861 discloses an aluminum steel sheet containing titanium (Ti) in iron, Japanese Patent Publication with Publication Number 63-184043 discloses an aluminum coated steel plate containing carbon (C), silicon (Si), copper (Cu), nickel (Ni), as well as a small amount of chromium (Cr) in iron, and Japanese Patent Publication with Publication Number 60-243258 discloses a Aluminum coated steel sheet containing 0.01 to 4.0% manganese, 0.001 to 1.5% titanium and 3.0 to 15.0% silicon.
    [0014] In addition, in order to stop the growth of an iron and aluminum alloy layer or the rapid diffusion of the aluminum metal into the iron due to the reaction of the aluminum with the iron, 10% or less of silicon is added to an aluminum coating bath. A coated steel plate that is manufactured by this method has relatively higher malleability and superior thermal resistance and is generally used for heat-resistant elements such as car silencers, hot water supplies, heaters and the interior walls of electrical cooking appliances rice.
    [0015] However, the silicon that is added to stop the formation of alloy layers can often cause damage to the surface appearance of the coated steel layers and the disadvantage that it has is that it makes the surface appearance unclear. In this regard, it is known that the damage caused by silicon to the surface appearance can be remedied to a certain extent by incorporating a small amount of magnesium (US Patent Publication Number 3,055,771 to Sprowl).
    [0016] In addition, in recent years, the fact of having extended the life of the components used for exhaust systems in cars has led to the development of steel sheets that are obtained by introducing Cr to a sheet metal. aluminum coated steel. For example, the Japanese Patent Publication with Publication Number 63-18043 discloses a coated steel sheet containing 1.8 to 3.0% chromium and the Japanese Patent Publication with Publication Number 63-47456 discloses a sheet of steel containing 2 to 3% chromium.
    [0017] Meanwhile, a steel sheet coated with a zinc and aluminum alloy has the disadvantage that a processed cutting part does not exert sufficient corrosion resistance. This phenomenon is caused by the deterioration in the resistance to corrosion of a surface that is exposed to the cutting part, which is due to a decrease in the sacrifice of the corrosion-resistant zinc that prevents corrosion of the iron through the layer of zinc alloy and aluminum. In addition, a steel sheet coated with a zinc and aluminum alloy has the disadvantage that its corrosion resistance deteriorates after processing. This is because a coated layer is formed that does not have a heterogeneous alloy phase and a contact surface becomes fragile with use after bending. or stretching, and therefore the corrosion resistance deteriorates after processing.
    [0018] In order to solve these phenomena, Korean Patent with Publication Number 0586437 discloses the fact of coating a sheet steel material coated with a zinc, aluminum, magnesium and silicon alloy with superior corrosion resistance in a bath that It contains 45 to 70% by weight of aluminum (Al), 3 to 10% by weight of magnesium (Mg), 3 to 10% by weight of silicon (Si), and the rest of zinc (Zn) and unavoidable impurities, as well as Korean Patent with Publication Number 0928804 discloses a steel sheet coated with a zinc, aluminum and magnesium alloy with superior corrosion resistance and malleability.
    [0019] The quality of the surface of a hot-dipped metal-coated steel sheet may depend on a technique for controlling a surface of a galvanized steel plate, as well as a coating bath composition. The components of a hot dip coating layer, for example zinc (Zn), aluminum (Al) and magnesium (Mg), bond with oxygen in the air to form an oxide film that degrades the surface quality of the coated steel plate. Specifically, a coated sheet steel product that is obtained by adding magnesium (Mg) to a coating bath has a problem with the quality of the exterior appearance of a surface compared to a current coating bath of GI or GL in many cases, and the problem is caused by oxidation that is characteristic of the characteristics of the element of magnesium (Mg). Mg is an element that has a high oxidation and the oxidation reactivity of Mg increases particularly in a coating bath that has a high temperature. Because of this, an oxide or an oxidation material of fine Mg that binds to other elements is confined in a band to deteriorate the surface quality of the coated steel sheet.
    [0020] In an effort to solve the problem, both a method of the related art for forming a non-oxidizing atmosphere to prevent oxidation in a section in which a band that is placed within a molten metal that comes from a molten metal that comes from a molten metal is exposed Coating bath (hole) and cooling in the air to perform the coating, as an apparatus of this method.
    [0021] Some examples of related techniques include International Publication WO2011 / 102434 (D1), Japanese Open Patent Publication 55-141554 (D2), Japanese Open Patent Publication 2010-202951 (D3), Japanese Open Patent Publication 2002 -348651 (D4), US Pat. No. 4,444,814 (D5), US Pat. No. 4,502,408 (D6) and similar publications.
    [0022] However, the existing methods and apparatus that form the non-oxidizing atmosphere in the section in which the band is placed inside a molten metal and which is subsequently exposed in the air have several problems.
    [0023] This is, as illustrated in the drawings (see FIG. 2 of D1, FIG. 2 of D2, FIG. 2 of D3 and FIG. 3 of D4) of the related techniques mentioned above, apparatus of related techniques to form a non-oxidizing atmosphere are configured as a box type that covers its entirety, from a surface of the coated molten metal to an upper air knife device.
    [0024] When the coated steel plate is manufactured, the temperature of each coating bath is about 460 ° C (zinc plated and general aluminum sheet steel bath), about 600 ° C (steel sheet steel bath Galvalume) and about 650 ° C (aluminum coated steel sheet bath), and here, due to the shape of the closed container or the closed box, an internal hot air that has a high temperature cannot be adequately released in the air and increases the internal temperature of the container or box.
    [0025] The method and structure of the related technique causes numerous problems in a real process such as the following:
    [0026]
    [0027] - Deformation of a structure due to heat in the limited space.
    [0028]
    [0029] : Structures such as an air knife break, a break, an immersion roller arm or similar structures that are thermally deformed.
    [0030]
    [0031] - Improper maleability of an electric device to drive an air knife, such as several sensors or an engine that is attached to the air knife.
    [0032]
    [0033] : To prevent this, a cooling device needs to be provided separately to avoid a temperature rise in several electrical devices. In addition, the life of the various electrical devices is also reduced.
    [0034]
    [0035] - It is not easy to control the grains after controlling the coating and an amount of bonding
    [0036]
    [0037] : Micronizing a grain size on a surface of the coated steel sheet greatly affects the quality of the product, and to micronize the grains, cooling should take place quickly after a bonding quantity is controlled, but in the case of box type, cooling efficiency deteriorates due to internal latent heat. In order to increase the speed of cooling of the web after coating, other techniques such as mist spraying or metal powder spraying are effectively used, as well as an air spray cooling technique, but the box-like structure It is a structure or method that rather makes cooling difficult after coating.
    [0038]
    [0039] - It is not easy to remove surface slags that are generated on an upper part of a coating bath.
    [0040] : The objective of forming a non-oxidizing atmosphere when spraying a nitrogen gas is to eliminate the generation of oxidation by hot dipping and the adsorption of the oxide that is generated to the band, but the box type has a structure that makes it difficult to eliminate the surface slags that are generated on the surface of the molten metal.
    [0041]
    [0042] : A considerable amount of oxide is actually generated on a surface of the band even under a non-oxidizing atmosphere, which must be removed regularly by resorting to personnel or using a robotic device but the box-like structure that has a closed shape needs to have a type Door opening and closing and the type of door opening and closing need to open and close repeatedly to remove rust from the surface of the band. In this case, repeated opening and closing make it difficult to maintain a stable nitrogen atmosphere inside the box.
    [0043]
    [0044] - Increase in the cost of nitrogen gas
    [0045]
    [0046] : There are two types of methods for filling the inside of the box-like structure with nitrogen, that is, a method of filling the inside of the box-like structure using pulverized nitrogen to control a quantity of coated joint from an air knife and a method to provide nitrogen through a different supply line from outside.
    [0047]
    [0048] : An amount of nitrogen that is sprayed from the air knife of a continuous and real zinc coating line is generally about 3000 to about 6000 m3 / h, which is insufficient to fill the oxygen within the box type structure with nitrogen and, as mentioned above, in order to release heat to the outside due to the molten metal temperature, an additional nitrogen gas should be supplied from the outside. With this objective, it is necessary to supply additionally nitrogen of about 3000 to about 4000 m3 / h in addition to the nitrogen that is supplied from the air knife, which is twice or more the amount of use of general nitrogen and occupies a considerable part of the manufacturing cost
    [0049]
    [0050] DESCRIPTION OF THE INVENTION
    [0051]
    [0052] The present invention has been realized in view of the aforementioned problems and, therefore, the main object of the invention is to provide an apparatus for forming a non-oxidizing atmosphere on a steel sheet that comes from a surface of a coating bath when producing a hot dipped coated steel sheet, and a method for producing a hot dipped zinc and aluminum coated steel sheet using said apparatus.
    [0053] In accordance with one aspect of the present invention, an apparatus is provided which is installed between a surface of a coating bath for hot dipping coating and an air knife installation for controlling the thickness of a coated metal adhered to a surface of a band to form a cloud of nitrogen (curtain) around the band that comes from the bathroom.
    [0054] Specifically, the apparatus of the present invention is separated from the surface 10 of the coating bath by a predetermined distance, and the apparatus includes: a body 3 having a semi-cylindrical shape, in which a lower surface of said body is open towards the bathroom surface 10; a groove 32 that is formed on an upper surface of the body 3 to allow the band 100 to pass through it; lower gas discharge pieces 33 that are formed in a circumference of a lower end of the body 3 to spray a nitrogen gas towards the surface 10 of the coating bath to block an ambient air; and interior gas discharge parts 31 that are positioned on both sides of the band 100 in an opposite manner through a lower surface of the body 3 in the direction of the width of the band 100 to spray a nitrogen gas towards the band 100 , where a multitude of injection nozzles 34 for spraying a nitrogen gas towards the band 100 are formed within the body 3.
    [0055] In the apparatus of the present invention, the steel sheet may be a steel sheet coated with an alloy based on zinc and aluminum, and the coating bath may include 33 to 55% by weight zinc, from 0.5 to 3% by weight of silicon, from 0.005 to 1.0% by weight in chromium, from 0.01 to 3.0% by weight of magnesium, from 0.001 to 0.1% by weight of titanium and the rest consists of aluminum and in the inevitable impurities contained. According to this composition, the coated steel sheet that is manufactured has an excellent surface appearance and corrosion resistance.
    [0056] In addition, in the apparatus of the present invention, the bath may also include 1 to 10% by weight of calcium in relation to the total weight of magnesium.
    [0057] In accordance with the apparatus of the present invention, by forming a cloud of nitrogen (air curtain) around the steel sheet coming from the coating bath, the steel sheet (strip) is prevented from coming into contact with the air ambient before you reach the installation of the air knife. Specifically, in the apparatus of the present invention, a nitrogen gas is sprayed into a body to fill the entire interior of the body, an opening of a lower surface of the body is blocked from the ambient air by the nitrogen gas at through the lower gas discharge parts that are formed on the lower surface of the body, and the nitrogen gas is sprayed into a band that comes from a bath surface through the internal gas discharge parts of both sides of the band, so that a coated metal that is adhered to the band is blocked from ambient air from the moment the band begins to come from the surface of the coating bath.
    [0058] Meanwhile, the apparatus of the present invention may further include a top gas discharge piece for jetting a nitrogen gas towards the band that passes through the slit, on both sides of said slit.
    [0059] Therefore, it is prevented that ambient air that includes oxygen is introduced into the body through the slit.
    [0060] Here, the inner gas discharge piece includes a circular tube body in which a multitude of nozzles are formed to discharge a nitrogen gas in order to separate from each other at a predetermined interval in a longitudinal direction, a housing in which is formed a groove in a longitudinal direction to accommodate one side of the tube body, as well as fixing blocks where each one has a gap that corresponds to the tube body to allow the tube body to be mounted on top at both ends of the tube body, where one or more ducts are formed in which the nitrogen gas moves inside the tube body and the housing, respectively.
    [0061] As described above, in accordance with the present invention, it is prevented that the steel sheet coming from the coating bath comes into contact with the ambient air before the steel sheet passes through the air knife , which improves the quality of the steel sheet with hot dipped metal coating.
    [0062] In addition, the heat that is transmitted from the coating bath and the slit to the apparatus can be easily expelled outside the apparatus.
    [0063]
    [0064] DESCRIPTION OF THE DRAWINGS
    [0065]
    [0066] The objects mentioned above, as well as other objects and features of the present invention, will become apparent with the description of the following embodiments taken in conjunction with the accompanying drawings, in which:
    [0067] Fig. 1 is a side view in accordance with an embodiment of the present invention. Fig. 2 is a partially enlarged view in accordance with an embodiment of the present invention.
    [0068] Fig. 3 is a perspective view of a body part in accordance with an embodiment of the present invention.
    [0069] Fig. 4 is a partially enlarged view of a part of the body in accordance with another embodiment of the present invention.
    [0070] Fig. 5 is a perspective view of a part of the body in accordance with another embodiment of the present invention.
    [0071] Fig. 6 is a perspective view of an inner gas discharge part in accordance with another embodiment of the present invention.
    [0072] Fig. 7 is a developed perspective view of an inner gas discharge part in accordance with another embodiment of the present invention.
    [0073] Fig. 8 is a cross-sectional view taken along the line A-A 'of Fig. 6.
    [0074] Fig. 9 is a bottom view of a body part in accordance with another embodiment of the present invention.
    [0075]
    [0076] PREFERRED EMBODIMENT OF THE INVENTION
    [0077]
    [0078] Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.
    [0079] Referring to Figs. ranging from 1 to 3, an apparatus according to an embodiment of the present invention is separated from a surface (10) of a coating bath at a predetermined distance and is placed below an air knife installation ( 2). The apparatus of the present invention has a body part (3). The body part (3) has a semi-cylindrical dome shape and a slit (32) is formed to allow the coated band (100) to pass through it in order to extend in a longitudinal direction of the body part (3) on an upper surface of said body. The slit (32) is formed to be greater than the thickness and the width of the band (100). The body part (3) can be formed of iron plate.
    [0080] A lower surface of the body part (3) is open towards the surface (10) of the coating bath. In addition, a lower gas discharge piece (33) for spraying a nitrogen gas towards the surface (10) of the bath is formed on a rectangular edge of the lower surface of the body part (3). The lower gas discharge piece (33), which is similar to a device called an air curtain , sprays down a compressed nitrogen gas through a slit (33a) (see Fig. 9) to form an air curtain in order to block both an inner and an outer part of the lower gas discharge part (33) of the ambient air.
    [0081] The apparatus of the present invention includes a multitude of nozzles (34) for jetting a nitrogen gas into the body (3). The nozzles (34) squirt a nitrogen gas towards the center of the body (3) to form a cloud of nitrogen S inside the body 3.
    [0082] In addition, the apparatus of the present invention includes internal gas discharge parts (31) that are positioned on both sides of the band (100) oppositely through a lower surface of the body (3) in the width direction of the band (100) and that squirts a nitrogen gas towards the band (100). The internal gas discharge piece (31) begins to spray a nitrogen gas from the moment the band (100) comes from the surface (10) of the coating bath, in order to basically prevent oxygen affect a surface of the band (100). In addition, an effect can be obtained to discharge outward heat emitted from the band (100). That is, since the apparatus of the present invention is installed so that it is separated from the surface (10) of the coating bath and that one of its lower surfaces is open, the heat that It is emitted from the band (100) and from a molten metal (1), it can be easily released outwards through the nitrogen gas jetted from the nozzles (34) and from the inner gas discharge part (31) .
    [0083] The pressure of the nitrogen gas jetted from both the nozzles (34), and from the lower gas discharge part (33) and from the internal gas discharge part (31) is variablely adjusted depending on the speed of movement, of the amount of coated joint of the band (100) or of other similar aspects, which are evident to a person skilled in the art.
    [0084] In general, spraying nitrogen to a steel plate that comes from a coating bath to form a non-oxidizing atmosphere is already a known technique (from D1 to D6), as discussed above. However, as mentioned in the related art, when a closed space is formed (such as the shape of a box) that includes an installation to adjust the amount of coating of a steel sheet and the nitrogen is then injected there, The heat of a molten metal is not released to the outside, which causes the machines and various sensors that are inside to be damaged and fail. In addition, since the closed space needs to be opened to occasionally remove the oxide that is produced on a surface of the coating bath, the operation of the apparatus should be interrupted or otherwise ambient air would enter, which would deteriorate the quality.
    [0085] The apparatus of the present invention is installed below the installation of the air knife (2) to adjust a quantity of coated metal adhered to the band (100). Furthermore, in the condition in which the dome-shaped body (3) covers and blocks an ambient air by means of the jet sprayed nitrogen from the lower gas discharge part (33) which is formed at the edge of the lower end of the body (3), the inner gas discharge part (31) sprays nitrogen directly to the steel plate (100) and the remaining space is filled with nitrogen that is discharged from the injection nozzle (34), transforming thus the space S in a non-oxidizing atmosphere formed by nitrogen as illustrated in Fig. 1.
    [0086] In the condition in which the air curtain S is formed by the nitrogen gas, heat can be easily released outwardly while preventing the surface of the band (100) from coming into contact with oxygen, so that several components (not shown) are not affected and thus neither damaged nor fail.
    [0087] In addition, since the apparatus of the present invention is separated from the surface of the coating bath at a predetermined distance, it is easy for both personnel and a device to insert the equipment to remove rust from the surface of the molten metal and even during The nitrogen elimination operation can be sprayed continuously, which offers the advantage that the operation of the apparatus is not necessary to be interrupted.
    [0088] In addition, even with the enclosed space, it is traditionally impossible to completely avoid the union of a molten metal surface oxide that forms on the surface of the molten metal to the steel plate or the formation of a thin oxide coating due to magnesium when the steel plate is released from the molten metal. In contrast, in the present invention, the nitrogen jetted from the inner gas discharge part (31) is sprayed in a downward direction towards the steel sheet (100), which generates a force to act and push the surface oxide of the molten metal outwards from the steel plate (100), so that both the introduction of the molten metal surface oxide to the steel plate (100) or the generation of a metal can be effectively eliminated thin oxide coating on the steel plate (100).
    [0089] In Figs. 1, 2 and 4 the reference number that has no explanation (50) indicates a meniscus that is formed by the molten metal that is adhered to both surfaces of the steel sheet (100) and that comes from the surface of the coating bath . An amount of the molten metal that is included within the meniscus corresponds to the thickness of the coated metal that is adhered to the steel sheet (100), which is adjusted by the speed of movement of the steel sheet, the gas pressure of nitrogen jetted from the air knife (2) or other similar aspects. The inner gas discharge piece (31) serves to physically remove the slag that is generated on a meniscus surface, such that it does not join the coated steel sheet (100t) or eliminate an atmosphere of oxidation in the that scum can be generated.
    [0090] Figs. 4 and 5 illustrate an apparatus in accordance with another embodiment of the present invention. In reference to Figs. 4 and 5, a pair of upper gas discharge pieces (35) are additionally formed to jet a nitrogen gas into the slit (32) which are formed on an upper surface of the body (3) of the apparatus of the present invention on both sides of the slit (32).
    [0091] The air knife installation (2), which is placed above the apparatus of the present invention, adjusts a coating amount of the steel sheet (100) while nitrogen jets with relatively high pressure, and here the gas Nitrogen sprayed with a high pressure can be mixed with ambient air to form an induced current. The induced current probably enters the body (3) through the slit (32). To avoid this, the upper gas discharge parts (35) are formed above the slit (32) through which the nitrogen gas is jetted to prevent oxygen that is mixed with the induced current from flowing inside the body (3) through the slit (32).
    [0092] Figs. ranging from 6 to 8 illustrate a configuration of the inner gas discharge part (31). In reference to Figs. ranging from 6 to 8, the internal gas discharge piece (31) includes a circular tube body (31a) on which a multitude of nozzles (311) are formed to discharge a nitrogen gas in order to that a housing (31b) in which a groove (314) is formed in a longitudinal direction to accommodate one side of the tube body (31a), and fixing blocks are separated from each other in a predetermined range in a longitudinal direction. (31c) where each of them has a hole (330) that is corresponds to the tube body (31a) to allow the tube body (31a) to be mounted there on both ends of the tube body (31a).
    [0093] Here one or more nitrogen supply holes, (315) and (312) are formed to provide a conduit for the purpose of supplying a nitrogen gas, and are formed within the tube body (31a) and the housing ( 31b), respectively.
    [0094] The housing (31b), the tube body (31a) and the fixing blocks (31c) are fixed through a fixing screw (318) that passes through the screw holes (315) and (317).
    [0095] In addition, there are caps (313) that have an outside diameter greater than that of the tube body (31a) and that are formed at both ends of the tube body (31a). If necessary, in order to adjust a spray angle of the nozzle (311), an operator can loosen the fixing screw (318) and hold the cap (313) to rotate the tube body (31a) at an angle predetermined.
    [0096] In Fig. 8, it is illustrated that a multitude of nozzles (311) are formed on the tube body (31a), but a nitrogen gas can also be discharged through an extended cut groove like the curtain of air.
    [0097] Fig. 9 illustrates a condition where the internal gas discharge piece (31) slit type is formed on the body (3). Fig. 9 is a bottom view of the body (3), in which the inner gas discharge piece (31) having slits (31f) for spraying a nitrogen gas is jetted to the body (3) through of a support bridge (39).
    [0098] In the above description and in the drawings, neither the component for supplying a nitrogen gas to the gas discharge parts (31), (33) and (35), nor the nozzles (34) and (311) of the apparatus of the present invention from the outside, but it is a matter of obvious design for a person skilled in the art.
    [0099]
    [0100] Next, the advantages offered by the device for forming a nitrogen cloud of the present invention described above will be described in comparison with the apparatus of the related art ranging from D1 to D6.
    [0101]
    [0102] 1) Since the device of the present invention forms the nitrogen cloud only in a partial space at a lower end of the air knife, the structure does not deform due to the latent heat that is generated by the box type of the related art and there is no factor that prevents the micronization of the grains due to a degradation of the cooling rate after coating.
    [0103]
    [0104] : The method and device of the present invention are related to a method (or structure) that forms nitrogen walls by forming a nitrogen curtain (nitrogen cloud) using a nozzle in a section of a lower end of the blade of air (2) in which oxidation may occur at first or in which a slag may be adsorbed to the band (100) on the surface of the coated molten metal, instead of having such a box type as that which exists in the aforementioned inventions in which the entire air knife that controls an amount of coated joint of the surface of the coated molten metal is covered .
    [0105]
    [0106] : Since the nitrogen cloud (S) is formed using the nitrogen nozzle in the lower and upper parts of the lower end section of the air blade and the inside of said blade is kept under a nitrogen atmosphere, instead of the method that fills the enclosed space with nitrogen, so a gas can flow smoothly from the inside of the apparatus to the outside and the latent heat is not maintained.
    [0107]
    [0108] : As can be seen in the drawings, since the nitrogen cloud (S) of the present invention is formed only in the partial space of the lower end of the air knife, it does not affect any type of structure (component) apart from the surface of the coated molten metal or the band in which the coating is made. Therefore, the possibility that the structure is deformed due to the heat generated by the box type of the related technique or the commission of an error due to the heat of an electrical device that drives the air knife such is minimal such as an engine or several sensors.
    [0109]
    [0110] ) Surface slag can be easily removed
    [0111]
    [0112] : Since the manufacturing apparatus of the present invention is separated from the surface of the coated molten metal by a predetermined distance, instead of an atmosphere being in direct contact with the surface of the molten metal coated or placed there, the slag can be eliminate resorting to personnel or a robot through space without anything interfering with it. In addition, since the cloud in the form of a nitrogen curtain that is sprayed through the nozzle is constantly maintained even when the apparatus or a tool is inserted into the separate space to remove the surface slag, it may be Also be effective in maintaining the nitrogen atmosphere.
    [0113]
    [0114] ) Effect of preventing adsorption of surface slag from the top of the molten metal coated to the strip
    [0115]
    [0116] : Although the part of the hole of the coated molten metal is filled with nitrogen in the manufacture of a steel plate coated with added magnesium alloy, it is not really possible to perfectly avoid a thin oxide film by the partial surface slag and that magnesium has a high oxidation.
    [0117] However, since the amount can be reduced considerably, the nitrogen gas spray manufacturing method is applied.
    [0118]
    [0119] : In the present invention, in order to remove a thin oxide film on top of the coated molten metal and the surface slag, the nitrogen atmosphere is formed, and in addition the adsorption of the slag from the slag can also be physically prevented. surface and thin oxide film to the band.
    [0120]
    [0121] : In the present invention, when a nitrogen is sprayed downwardly from the lower nitrogen discharge piece (33), a nitrogen cloud is formed in a lateral direction of the coated hole (see FIG. 1). This generates the effect of physically preventing the movement of the surface slag and the fine oxide film that floats on an upper part of the coating bath near the strip in order to avoid adsorption of this to the strip.
    [0122]
    [0123] : Therefore, the present invention, which achieves the effect of simultaneously preventing adsorption to the web after coating when the nitrogen atmosphere is formed, is different from the device of the related art for removing an oxide by forming only the atmosphere of nitrogen.
    [0124]
    [0125] 4) Cost reduction for nitrogen gas
    [0126]
    [0127] : Since the device of the present invention forms the nitrogen atmosphere only in the necessary partial space at the lower end of the air knife, the nitrogen cloud can only be maintained with a small amount of nitrogen that comes from the piece of Lower nitrogen discharge (33), and is more effective compared to the previous box type for supplying nitrogen while maintaining a pressure greater than normal pressure.
    [0128]
    [0129] : Therefore, the present invention is capable of reducing the amount of nitrogen use compared to the related technique method for filling the inside of the box type with nitrogen. In addition, the manufacturing method of the present invention is a manufacturing method that can show a considerably effective effect of both oxide generation removal and adsorption prevention, as compared to the related art method, even with the same amount. of nitrogen
    [0130]
    [0131] Meanwhile, the present invention provides a method for manufacturing a steel sheet coated with an alloy based on zinc and aluminum that has excellent malleability and corrosion resistance when coating a steel sheet coated with an alloy based on zinc and aluminum in the bath, which includes 33 to 55% by weight of zinc, 0.5 to 3% by weight of silicon, from 0.005 to 1.0% by weight of chromium, of 0.01 to 3.0% by weight of magnesium, from 0.001 to 0.1% by weight of titanium, and the rest consists of aluminum and impurities inevitably contained when using the apparatus of the present invention.
    [0132] In the present invention, by forming nitrogen walls on a separate part of the surface of the coating bath at a predetermined distance and at a lower end of the installation of the air knife, it prevents a thin oxide coating that is formed on the surface of the coating bath at the same time that the oxygen comes into contact with it, it is adsorbed to the steel sheet coated with an alloy based on zinc and aluminum that has been coated in the bath having the coating composition.
    [0133] In the method of the present invention, the bath includes from 35 to 55% by weight zinc. Zinc has a sacrificial protection compared to a base steel plate, which serves to reduce corrosion. A zinc of 35% by weight or more is needed, since if the zinc is less than 35% by weight, the fluidity of the coating bath deteriorates and the corrosion resistance decreases, and if the zinc is greater than 35 % by weight, the bath temperature needs to be increased, which increases the surface slag and causes an obstacle in the operation, which in turn causes the malleability deterioration. In addition, if zinc is greater than 55% by weight, the aluminum index on the coated steel plate increases to increase the cost, which deteriorates economic efficiency.
    [0134] The coating bath of the present invention contains 0.5 to 3.0% by weight of silicon. Silicon works to stop the growth of an alloy layer, is effective in improving the fluidity of the coating bath and in polishing it, and should be added in an amount of 0.5% by weight or more. An important role of silicon in the coating layer is to control the formation of an alloy layer of a base steel sheet with aluminum. When the amount of silicon added is 0.5% by weight or less, the function of the silicon is limited and its malleability deteriorates considerably. On the other hand, when silicon is added in an amount that exceeds 3% by weight, Mg2Si, which serves as a factor that contributes to the improvement of the corrosion resistance of the coating layer, is produced and grows in excess over the surface of the coating layer, the surface of this becomes hard, which causes the surface to discolor at an early stage and deteriorates the coating properties after treatment. Therefore, the amount of silicon added should preferably be 0.5 to 3% by weight.
    [0135] The chromium added to the bath serves to form a passive and dense oxide film on the surface of the coating layer, improves the corrosion resistance of the aluminum coated steel sheet and makes the grains of the coating layer thin , since chromium is distributed evenly in the coating bath.
    [0136] Chromium serves to create a predetermined shape of a mixed phase band of aluminum, zinc, silicon and chromium in the coating layer (FIG. 2). The chromium that is present in the coating layer reacts with the aluminum to form an AlCr2 phase and serves to improve malleability and corrosion resistance in a fracture plane after processing. Chromium allows the silicon content to be controlled at 3% by weight or less and therefore prevents excessive precipitation of needle-shaped silicon in the coating layer.
    [0137] It is known that the chromium content that provides these effects is 0.1% or more (US Patent with Publication Number 3,055,771 to Sprowl). However, in the method of the present invention the chromium content is from 0.005 to 1.0% by weight. When the chromium content is 0.005% by weight or less, the chromium is not immediately homogeneously distributed in the bathroom and when the content of this is 1.0% by weight or more, the temperature needs to increase of the coating bath due to the increase in chromium content, whereby the slag increases and its appearance is unfavorably damaged due to the slag that adheres to the surface of the coated steel sheet.
    [0138] Therefore, it is preferable that the chromium content is from 0.005 to 1.0% by weight.
    [0139] The coating bath of the present invention also contains 0.01 to 3.0% by weight of magnesium.
    [0140] The magnesium added together with the chromium binds to the oxygen that is present in the air and that contacts the coating layer to form a passive film and thus prevents oxygen from being released inside the alloy layer and also prevents additional corrosion, which improves corrosion resistance. The presence of a Mg2Si phase (see FIGS. 1 and 2) that is formed through the reaction between magnesium and silicon and a MgZn2 phase that occurs through the reaction between magnesium and zinc in the Coating layer serves to reduce the rate of corrosion by sacrificing corrosion resistance of zinc during corrosion and creating a local battery. In addition, magnesium reacts with aluminum, obstructs the impregnation of oxygen and thus considerably improves the corrosion resistance of a cutting surface.
    [0141] When an amount of magnesium added is 0.01% by weight or less, the dispersion capacity and the corrosion resistance improvement effect associated with the oxidation properties are minimal, and when the amount exceeds 3.0 % by weight, the coating bath becomes saturated, the melting point increases, the malleability deteriorates, the surface qualities deteriorate due to the continuous generation of slag on the surface, the production costs increase and the problems associated with the Production processes become serious problems.
    [0142] It is preferable that the amount of magnesium added is 0.01 to 3.0% by weight.
    [0143] The coating bath of the present invention also contains calcium in an amount of 1 to 10% by weight in relation to the weight of magnesium. The calcium added together with magnesium and chromium stops the formation of magnesium oxide on the contact surface of a coated molten metal and thus prevents deterioration in appearance quality by a thin magnesium oxide film that is adhered to the surface of the coated steel sheet.
    [0144] It is known that the incorporation of Ca, Be, Al or the like into a molten Mg bath considerably stops oxidation and combustion of the molten Mg bath even at high temperatures. According to a mechanism that stops the oxidation of the molten Mg bath by the incorporation of calcium, the combustion temperature of the molten Mg bath increases to 200 ° C or more due to the incorporation of calcium. This increase in the combustion temperature of a Mg alloy usually causes an oxide layer that generally forms on the surface to change from a porous oxide layer to a dense oxide layer, which effectively obstructs the permeability of oxygen.
    [0145] When the calcium content is 1% by weight or less in relation to the weight of magnesium, the dispersion deteriorates and the inhibition effect of the MgO oxide film is minimal, and when the content thereof exceeds 10% by weight in relation to the weight of magnesium, the malleability of the coating layer that causes the formation of a metal compound of aluminum and calcium may deteriorate. Therefore, it is preferable that the amount of calcium added is 1 to 10% by weight in relation to the weight of magnesium.
    [0146] The present invention provides an application of joining walls of the nitrogen spray nozzle that allows nitrogen to be purified and prevents an oxide film from adhering to the bands, to a lower surface of an air bath blade of the covering. The formation of an oxide film stops when the lower surface of the air knife that rises to the contact surface of the coating bath is cleared after a band is submerged into the bath, with a nitrogen atmosphere and a Nitrogen removal on the bottom surface of the nitrogen walls through a nitrogen curtain nozzle in order to prevent the introduction of a thin oxide film that is formed after coming into contact with the air in an outer part of the Molten coating bath surface inside the walls and have this adhere to the band.
    [0147] In addition, the coating bath of the present invention also includes from 0.001 to 0.1% by weight of titanium in order to reduce the size of the grains that make up the appearance of the coating layer and that form a form of flower coating layer. When the amount of titanium added is 0.001% by weight or less, the dispersion on the steel plate deteriorates, and when the amount of this is 0.1% by weight or more, it is difficult to dissolve within Bath and titanium will not result in improved effects.
    [0148] The present invention is based on the reduction of the grain size that is produced by increasing the possibility of nucleation on a conventional Galvalume coated steel sheet by incorporating adequate amounts of chromium, magnesium, calcium and titanium into a Coating bath containing aluminum, zinc and silicon.
    [0149] That is, the added components are dispersed in the coating layer to form several cores, such as the Mg2Si, MgZn2 and AlCr2 phases after they are It covers the steel sheet, and mutual interference between the grain edges controls the growth of the grains.
    [0150] Therefore, a beautiful surface appearance is guaranteed, corrosion between the grain edges stops and corrosion resistance is improved. In addition, the growth of an aluminum and iron alloy layer is halted and, therefore, a coating film with superior malleability is formed.
    [0151] Meanwhile, it is preferable to set a bath temperature of the base steel sheet within the molten coating bath between 570 and 650 ° C and a temperature of the molten coating bath between 550 and 650 ° C.
    [0152] When the bath temperature of the base steel sheet is below 550 ° C, the fluidity of the coating bath deteriorates, the appearance of the coating is unfavorable and the adhesiveness of the coating deteriorates. When the bath temperature of this is 650 ° C or more, the rapid thermal diffusion of the base steel sheet causes abnormal growth of the alloy layer and deterioration in its malleability, as well as the formation of an oxide layer of excessive Fe inside the molten coating bath.
    [0153] Preferably a coating amount should be 20 to 100 gr / m2 based on one side. When the amount of coating is 20 gr / m2 or less, the air pressure of the air knife equipment that controls the amount of coating increases excessively, variation in the amount of coating occurs and damage also occurs the appearance of the film and the adhesion of the oxide slag to it due to a rapid increase in surface oxide within the molten coating bath.
    [0154] In addition, when the amount of coating is 100 gr / m2 or more, the alloy layer is excessively formed and the malleability deteriorates considerably.
    [0155] Hereinafter, the present invention will be described in more detail by comparison between the Examples and the Comparative Examples. These examples are provided only to illustrate the present invention in more detail and should not be construed as limiting the scope and spirit of the present invention.
    [0156] A cold-rolled steel sheet with a thickness of 0.8mm, a width of 120mm and a length of 250mm was coated using a molten coating simulator in accordance with the apparatus of the claim. As shown in Table 1, a steel sheet coated with an alloy based on aluminum and zinc was manufactured by changing a coating bath composition.
    [0157] The amount of bonded coating was controlled using an air knife (2) and the amount of sheet metal fabrication coated with an alloy based on aluminum and zinc that was evaluated based on one side is shown in Table 1.
    [0158] The evaluation points were corrosion resistance and malleability. The corrosion resistance was compared and evaluated with an initial oxidation generation time (5%) under a NaC1 salt spray test atmosphere at 35 ° C in accordance with KSD 9504. The malleability was compared and evaluated. observing a width (fracture width) of the cracks that are generated after the 180 ° OT flexural test in accordance with a test method of KSD 0006 that uses a stereoscopic microscope of 30 to 50X and that measures the width of the fracture surface. The observation of the alloy phase was performed using an X-ray diffraction.
    [0159] The test results that were obtained by the test method are presented in detail below.
    [0160]
    [0161] 1. Maleability: observed according to the level of the crack width.
    [0162] ©: fracture width from 10 to 20 gm
    [0163] A: fracture width from 20 to 30 gm
    [0164] X: fracture width from 40 to 50 gm
    [0165] 2. Slag level: an amount of slag generated in an upper part of the coating bath after the coating specimens have melted in accordance with the coating composition.
    [0166] ©: generation of 5% or less slag in relation to the bathroom
    [0167] A: generation of 10 to 20% less slag in relation to the bathroom X: generation of 20% or more slag in relation to the bathroom
    [0168] 3. Surface appearance: level of visibility (cleaning) and grain formation of the surface appearance of the coating layer observed with the naked eye ©: Clear grain formation with high brightness
    [0169] A: Matte grain formation
    [0170] X: Small grain formation with bad appearance
    [0171] 4. Corrosion resistance of the cutting surface: oxidation index generated after the salt spray test for 1,000 hours
    [0172] ©: oxidation rate of 5% or less
    [0173] A: 10 to 20% oxidation rate
    [0174] X: oxidation rate of 30% or more
    [0175] 5. Corrosion resistance of the flat part: index of the corrosion generated after the salt spray test for 2,500 hours.
    [0176] : oxidation rate of 5% or less
    [0177] : oxidation rate of 20 to 30%
    [0178] X: oxidation rate of 30% or more
    [0179]
    [0180] As illustrated in Table 1, it can be seen that when the coating is carried out using the apparatus of the present invention, the amount of slag generation is minimal and both the malleability and the corrosion resistance of the steel sheet Coated in accordance with the example of the present invention are excellent.
    [0181] That is, the Examples of the present invention showed a crack (fracture surface) that was generated after a flexion at 180 ° OT, between about 10 to about 20 um and thus showed a superior corrosion resistance compared to the comparative examples. The Examples of the present invention showed the generation of a total cross oxidation after 3,000 hours or more in an adhered coating amount of 50 gr / m2 on the basis of one side and the generation of oxidation on the cross section after 1,000 hours or more. These results show that the Examples of the present invention exhibit superior corrosion resistance compared to conventional compositions.
    [0182] As a result of observation with the naked eye, the Examples showed an aspect of the upper surface compared to the conventional Examples. This is due to the reduction in grain size.
    权利要求:
    Claims (8)
    [1]
    1. - Apparatus for forming a nitrogen cloud, installed between a surface (10) of a coating bath that performs hot dip coatings and an air knife installation (2) to control a thickness of an adhered coating metal to a surface of a band (100) to form a cloud of nitrogen (curtain) around the band (100) that comes from the coating bath (1), characterized in that the apparatus is separated from the surface 10 of the coating bath by a predetermined distance, and the device consists of:
    A body (3) having a semi-cylindrical shape, in which the lower surface thereof is open towards the surface (10) of the bath, a slit (32) that is formed on an upper surface of the body (3) to allow the band (100) passes through it, the lower gas discharge parts (33) are formed on the perimeter of a lower end of the body (3) to spray a nitrogen gas towards the surface (10) of the bath to block an ambient air, and interior gas discharge parts (31) placed on both sides of the band (100) in an opposite manner, along the inside of the semi-cylindrical body (3), and below and separated from its surface in the direction of the width of the band (100) to spray a nitrogen gas towards the band (100), where a multitude of injection nozzles (34) are formed on the surface of the body (3) to spray jets a nitrogen gas towards the band (100).
    [2]
    2. - Apparatus for forming a nitrogen cloud, according to claim 1, characterized in that it also has internal gas discharge parts (35) that spray jets a nitrogen gas towards the band (100) that comes from the groove (32 ) additionally formed on both sides of the groove (32).
    [3]
    3. - Apparatus for forming a nitrogen cloud according to claim number 1, characterized in that the inner gas discharge piece (31) is composed of: a circular tube body (31a) on which a multitude of nozzles are formed (311) to discharge a nitrogen gas in order to be separated from each other in a predetermined range in a longitudinal direction; a housing (31b) in which a groove (314) is formed in a longitudinal direction to accommodate one side of the tube body (31a); and fixing blocks (31c) where each of them has a recess (330) that corresponds to the tube body (31a) to allow the tube body (31a) to be mounted on it at both ends of the tube body (31a), where one or more nitrogen supply holes (315) and (312), which provide conduits in which a nitrogen gas moves, are formed within the tube body (31a) and the housing (31b ), respectively.
    [4]
    4. - Apparatus for forming a nitrogen cloud according to claim number 2, characterized in that where the inner gas discharge part (31) is composed of: a circular tube body (31a) on which a multitude of nozzles (311) are formed to discharge a nitrogen gas in order to be separated from each other at a predetermined interval in a longitudinal direction; a housing (31b) in which a groove (314) is formed in a longitudinal direction to accommodate one side of the tube body (31a); and fixing blocks (31c) where each of them has a recess (330) that corresponds to the tube body (31a) to allow the tube body (31) to be mounted on it at both ends of the tube body (31a), where one or more nitrogen supply holes, (315) and (312), which provide conduits in which a nitrogen gas moves, are formed within the tube body (31a) and the housing ( 31b), respectively.
    [5]
    5. - Method for manufacturing a hot dipped zinc and aluminum coated steel sheet using the same apparatus of claim 3, characterized in that the method comprises coating a steel sheet in a bath comprising from 35 to 55% by weight of zinc, from 0.5 to 3% by weight of silicon, from 0.005 to 1.0% by weight of chromium, from 0.01 to 3.0% by weight of magnesium, from 0.001 to 0, 1% by weight of titanium, and the rest of aluminum and unavoidable impurities.
    [6]
    6. - Method for manufacturing a hot dipped zinc and aluminum coated steel sheet using the same apparatus of claim number 4, characterized in that the method comprises coating a steel sheet in a bath comprising from 35 to 55% by weight of zinc, from 0.5 to 3% by weight of silicon, from 0.005 to 1.0% by weight of chromium, from 0.01 to 3.0% by weight of magnesium, from 0.001 to 0, 1% by weight of titanium, and the rest of aluminum and unavoidable impurities.
    [7]
    7. - Method for manufacturing a hot dipped zinc and aluminum coated steel sheet using the same apparatus, according to claim number 5, characterized in that the coating bath is also composed of 1 to 10% by weight of calcium on the basis of the total weight of magnesium.
    [8]
    8. - Method for manufacturing a hot dipped zinc and aluminum coated steel sheet using the same apparatus, according to claim number 6, characterized in that the coating bath is also composed of 1 to 10% by weight of calcium on the basis of the total weight of magnesium.
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    同族专利:
    公开号 | 公开日
    KR101758717B1|2017-07-18|
    GB2564365B|2021-11-03|
    WO2017200134A1|2017-11-23|
    DE112016006868T5|2019-03-07|
    ES2725126B1|2020-07-17|
    GB2564365A|2019-01-09|
    ES2725126R1|2019-09-27|
    NZ721156A|2019-06-28|
    GB201817297D0|2018-12-05|
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    KR200438061Y1|2006-11-21|2008-01-16|현대하이스코 주식회사|Equipment for preventing and removing ash in snout of CGL|
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    JP5221733B2|2010-10-26|2013-06-26|日新製鋼株式会社|Gas wiping device|
    KR101535073B1|2012-08-01|2015-07-10|동국제강주식회사|Production method for zn-al alloy coated steel sheet and its production device|
    KR101510505B1|2012-12-21|2015-04-08|주식회사 포스코|Method for manufacturing high manganese galvanized steel steet having excellent coatability and ultra high strength and manganese galvanized steel steet produced by the same|
    KR101568506B1|2013-12-21|2015-11-11|주식회사 포스코|Plating Apparatus|KR101944963B1|2018-01-15|2019-02-07|탑스|Fixing jig for plate substrate apparatus|
    法律状态:
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    优先权:
    申请号 | 申请日 | 专利标题
    KR1020160060100A|KR101758717B1|2016-05-17|2016-05-17|Apparatus for producing zinc-aluminum alloy-coated steel sheet with superior workability and corrosion resistance and manufacturing method using the same|
    PCT/KR2016/005617|WO2017200134A1|2016-05-17|2016-05-27|Apparatus for forming nitrogen cloud in order to manufacture hot-dip metal coated steel sheet having excellent surface quality, and method for manufacturing coated steel sheet by using same|
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