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    • 专利摘要:
    The invention discloses a process for manufacturing a grade II aluminum-sheathed relaxation-grade steel wire for a bridge cable, which comprises the following steps: preparing a wire rod for a bridge wire; surface treatment of the wire rod; stretching: the strength of the steel wire obtained reaches 1770-2100 MPa; sheathing: the temperature in the cavity of the sheathing machine is 380 to 430 ° C, and the cladding speed is 50 to 150 m / min; the resultant aluminum sheathed steel wire has a resistance in the range of 720 to 2060 MPa; stabilizing treatment: the aluminum-sheathed steel wire is heated by medium-frequency induction, and the heating temperature is controlled between 370 and 420 ° C to complete the stabilization treatment. The invention optimizes the process parameters of the surface treatment, drawing, sheathing and stabilization of the wire rod by changing the processing paths, to form an aluminum sheathed steel wire for bridge wire with Grade II relaxation performance, which fully meets the application requirements for a high grade bridge. Figure for the abstract: Fig. 1.
    公开号:FR3080305A1
    申请号:FR1904212
    申请日:2019-04-19
    公开日:2019-10-25
    发明作者:Yuming HE；Laian DING；Lingen Huang；Jinfeng LIAO；Xianhai JIANG；Guowen Wang
    申请人:Jiangxi Xinhua Metal Products Co Ltd；
    IPC主号:
    专利说明:

    Description
    Title of the invention: process for manufacturing a steel wire sheathed in grade II relaxation aluminum for bridge cables Technical field [0001] The present invention relates to the technical field of steel wire products for bridge cables such as cable-stayed bridges and suspension bridges, and more particularly a process for manufacturing a grade II relaxed aluminum-clad steel wire for bridge cables.
    PRIOR ART In 2007, our company designed a steel wire sheathed in prestressed aluminum for the first time in the world, and applied for the patent right of invention with the patent number ZL 200710051322.9, wherein the product is a bimetallic composite of aluminum and steel and is primarily designed to improve the corrosion resistance of bridge cable materials. After years of research and development on pre-stressed aluminum-clad steel wire, we have found that in the industrialization process, the patented manufacturing process has certain flaws, mainly with regard to product performance. . The specific defects are as follows: the product manufactured in the test does not meet the design requirements for grade II relaxation performance and cannot be used on long-life, high-grade bridges. As there are national or industry standards for pre-stressed aluminum sheathed steel wire, aluminum sheathed steel wire products sold by the company are supplied in accordance with national standard GB / T17101-2008 " galvanized steel wire for bridge cables ”. The stress relaxation performance requirement is as follows: when the steel wire for cable is at 20 ± 2 ° C, under conditions such that the initial test load is 70% of the nominal load, the rate of stress relaxation for grade I relaxation after 1000 hours is less than 7.5%, and the rate of stress relaxation for grade II relaxation is not more than 2.5%. Numerous experiments have shown that the product produced using this patented technology has difficulty meeting the requirements for grade II relaxation performance due to the sequence of the manufacturing process. The manufacturing process of the patented technology consists in stabilizing the steel wire after drawing, and then in sheathing it. The temperature of the die cavity in the sheathing process is from 450 ° C to 600 ° C, which changes the internal structure of the steel wire (such as grain limit, reduction of crystal dislocation), destroys the original relaxation performance, increases the relaxation rate, and therefore fails to meet the severe requirement of grade II relaxation performance.
    summary
    The object of the present invention is to provide a method for manufacturing a grade II relaxation aluminum clad steel wire for a bridge cable, and the product in aluminum clad steel wire obtained has good grade II relaxation performance, and the technical performance of the product completely satisfies the requirements of the high quality index of GB / T17101-2008 standard and satisfies the application requirements of long life bridges and high grade.
    In order to achieve the above object of the present invention, a method for manufacturing a grade II relaxation coated aluminum clad steel wire for a bridge cable comprises the following steps:
    51, preparation of the raw material: preparation of wire rods for bridge cables having the corresponding product specifications;
    52, surface treatment of the wire rod: implementation of a surface treatment of the wire rod for the bridge cable;
    53, drawing: the wire rod is drawn continuously into a wire having the required specifications by means of a wire drawing machine, and after being hardened by drawing, the resistance of the steel wire formed reaches 1,770- 2,100 MPa, and then the wire is subjected to the sheathing process;
    54, sheathing: first degreasing of the drawn steel wire, and then cleaning of the residual rust on the surface of the steel wire; after drying, introduction of the steel wire into an induction heating furnace at intermediate frequency for a preheating treatment, the wire is heated by induction to 370-420 ° C, and then enters a sheathing machine by continuous extrusion ; at the same time, the high purity aluminum bar or the aluminum alloy bar, cleaned, dried and straightened, is simultaneously introduced into the die cavity of the sheathing machine by the other end of the sheathing machine. The temperature in the cavity of the cladding machine is 380 to 430 ° C, the shutter pressure is 60 to 80 MPa, the cladding speed is 50 to 150 m / min. According to different strength requirements, different thicknesses of sheathing with an aluminum layer are designed and, after cooling and drying, a steel wire sheathed in aluminum is obtained, and the steel wire sheathed in aluminum has a resistance in the range from 1,720 to 2,060 MPa;
    55, stabilization treatment: application of a certain tension to the aluminum sheathed steel wire, the tension is 38 to 45% of the actual breaking force of the aluminum sheathed steel wire. Under these conditions, the aluminum-coated steel wire is subjected to induction heating at medium frequency, and the heating temperature is controlled between 370 ° C. and 420 ° C. so that the stress of the internal fabric is eliminated, and then the stabilization treatment is finished.
    The method further comprising a step S6, inspection: the stabilized aluminum sheathed steel wire is picked up by a take-up reel, the surface quality and the thickness of the aluminum layer are inspected, and then the inspection performance is performed in accordance with a predetermined standard, the strength of the aluminum-clad steel wire is 1,700 to 2,040 MPa, the grade II relaxation rate is not more than 2.0%. The predetermined standard can be GB / T17101-2008.
    In addition, in step S2, the wire rod is subjected to pickling, phosphating, neutralization, and drying.
    In addition, the pickling can be a pickling with industrial hydrochloric acid, the concentration of hydrochloric acid is 12 to 25%, and the pickling time is 30 to 45 minutes.
    In addition, in the phosphating step, the total acidity of the phosphating solution used is 50 to 70 degrees, the temperature is 70 ° C to 75 ° C, and the immersion phosphating time is 3 to 5 minutes.
    In addition, in step S3, the stretching is carried out 7 to 9 times.
    Furthermore, in step S4, the aluminum layer of the aluminum-clad steel wire has a thickness of 0.03 to 0.10 mm to form a nested layer of steel and aluminum. Furthermore, in step S5, the speed of introduction of the aluminum-clad steel wire is controlled so as to be from 80 to 180 m / min.
    In comparison with the prior art, the advantageous effects of the present invention include the following: the present invention optimizes the process parameters of surface treatment, drawing, sheathing and stabilization of the wire rod by changing the channel treatment. After the aluminum-clad steel wire has finally been stabilized, the aluminum-clad wire rod for bridge cable with grade II relaxation performance is formed. The aluminum-clad steel wire obtained by the manufacturing process of the present invention has a smooth surface, high strength and good relaxation performance, and completely satisfies the application requirements for long-life bridges and high grade.
    Brief description of the drawings [0003] [fig.l] Figure 1 is a schematic view showing the flow of operations of the manufacturing process of the present invention.
    Detailed Description The present invention will be more clearly and completely described below in conjunction with the drawings and the embodiments.
    With reference to Ligure 1, the present invention discloses a method for manufacturing a grade II relaxation coated aluminum clad steel wire for a bridge cable, and the method comprises the following steps:
    51, preparation of the raw material: preparation of wire rods for bridge cables having the corresponding product specifications;
    52, implementation of a surface treatment of the wire rod for the bridge cable: pickling, phosphating, neutralization, and drying of the wire rod;
    a) pickling: the wire rod is washed with acid with industrial hydrochloric acid, the concentration of hydrochloric acid is preferably 12 to 25%, the pickling time is 30 to 45 minutes, so that iron oxide scales on the surface of the wire rod are removed;
    b) phosphating: the wire rod treated by pickling is further subjected to a phosphating treatment, preferably the total acidity of the phosphating solution is 50 to 70 degrees, the temperature is 70 to 75 ° C, and the immersion phosphating time is 3 to 5 minutes. After phosphating, a phosphating film is formed on the surface of the wire rod, and after the lubricant has been added to the wire drawing die, the wire rod has better lubricity in the drawing process;
    c) neutralization: the wire rod after the two above steps is put in a lime basin for 3 to 6 minutes, the acid acid phosphating solution remaining on the surface of the wire rod is neutralized and then the wire is removed, so that the formation of rust on the phosphated wire rod is prevented;
    d) drying: the wire rod having passed the three steps above is dried naturally, and the dried wire rod is assembled on a wire drawing machine to prepare a wire drawing treatment of the wire rod;
    53, wire drawing: the wire rod is drawn continuously into a steel wire having the required specifications by means of a wire drawing machine, the number of drawing passes is from 7 to 9 and, after hardening by drawing, the resistance of the steel wire obtained reaches 1,770-2,100 MPa, and then the wire is subjected to the sheathing process;
    54, cladding: first degreasing of the drawn steel wire, and then cleaning of residual corrosion and impurities on the surface of the steel wire; after drying, it is sent to an intermediate frequency induction heating furnace for a preheating treatment, and then introduced into a sheathing machine by continuous extrusion; the wire is heated to 370-420 ° C, preferably 380 to 410 ° C. The test shows that: if the temperature of the medium-frequency induction heating oven is less than 360 ° C, the bonding strength between aluminum and steel is lower; if the temperature of the medium-frequency induction heating furnace is higher than 430 ° C., the surface of the steel wire will be sticky towards aluminum, will not be clean, will retain impurities, and surface quality will deteriorate. Furthermore, the bar of aluminum alloy or of high purity aluminum cleaned, dried and straightened is simultaneously introduced into the die cavity of the cladding machine by the other end of the cladding machine, and the temperature in the cavity of the cladding machine die is 380 to 430 ° C, the cap pressure is 60 to 80 MPa, and the cladding speed is 50 to 150 m / min. Likewise, if the temperature inside the sheathing machine cavity is too high, the surface of the steel wire will be sticky towards aluminum, will not be clean, will retain impurities, and the surface quality will be deteriorated, and therefore the temperature will generally not exceed 450 ° C, and is preferably controlled in the range of 380 to 430 ° C; moreover, the cladding speed should not be too high. If the speed exceeds 160 m / min, the spinning process during the aluminum cladding will cause longitudinal scratches on the surface of the steel wire, the surface of the steel wire is not round, and the quality of surface is deteriorated. In this process, the aluminum alloy or high purity aluminum bar is continuously introduced into the die cavity by extrusion wheels, the aluminum bar is softened by heat, and is uniformly pushed around the wire. steel, and the moving steel wire and softened aluminum are continuously rubbed to remove the aluminum. After bonding ("sizing"), an aluminum sheath layer which is closely bound is formed, and the sheathing thickness of the aluminum layer is designed in a variable manner according to the different resistance requirements. The thickness of the aluminum layer of the aluminum-clad steel wire ranges from 0.03 mm to 0.10 mm, and an overlapping layer of steel and aluminum is formed. After cooling and drying, an aluminum-clad steel wire is obtained, the resistance of which is in the range from 1,720 to 2,060 MPa;
    S5, stabilization treatment: the definition of stabilization treatment comes from standard GB / T5224-2003, which is a short-term heat treatment under a certain voltage intended to reduce stress relaxation during the application of the wire of prestressed steel. The purpose of stabilization of aluminum-clad steel wire is to ensure that the stress relieving performance of aluminum-clad steel wire meets the technical design requirements of prestressing of bridge cables and the like. A certain tension is applied to the aluminum sheathed steel wire, the tension is 38 to 45% of the actual breaking force of the aluminum sheathed steel wire, and the speed of introduction of the steel wire coated with aluminum is controlled at 80-180 m / min. Under these conditions, the aluminum-coated steel wire is subjected to induction heating at intermediate frequency. The heating temperature is controlled at 370-420 ° C, so that the stresses of the internal tissue are eliminated, and then the stabilization treatment is completed.
    The method can also include a step S6. S6, inspection: the aluminum-coated steel wire, after the stabilization treatment, is picked up by a take-up reel, the surface quality and the thickness of the aluminum layer are inspected, and then the performance is inspected according to a predetermined standard, such as GB /
    T17101-2008, the resistance range of the sheathed steel wire is 1,700 to 2,040 MPa, and the grade II relaxation rate is not more than 2.0%.
    Embodiment 1:
    As shown in Figure 1, in accordance with the above operational steps, a high strength grade II relaxation coated aluminum clad steel wire having a diameter of 7.00mm is produced in the present embodiment:
    51, preparation of the raw material: the wire rod prepared for the bridge cable can adopt the Baosteel 87MnQL grade, the size of the raw material is 14.00 mm, the resistance of the raw material is detected to be 1250 MPa , and the method goes to step S2;
    52, surface treatment of the wire rod: pickling, phosphating, neutralization, and drying of the wire rod;
    a) pickling: pickling of the wire rod for bridge cable, the pickling with acid is carried out by using industrial hydrochloric acid, the concentration of hydrochloric acid is 13%, the pickling time is 32 minutes;
    b) phosphating: the machine wire for acid-washed bridge cable is further subjected to a phosphating treatment, the total acidity of the phosphating solution is 52 degrees, the temperature is 72 ° C., and the immersion phosphating time is 4 minutes;
    c) neutralization: the wire rod for the bridge cable, after the two steps above, is put in the lime basin for 3 to 4 minutes, and then removed therefrom;
    d) drying: the wire rope for bridge cable having passed the above three stages is dried naturally, and the wire rod for dried bridge cable is assembled on a wire drawing machine so that it is prepared for the step S3 of the method;
    53, stretching:
    The wire drawing machine continuously draws the wire rod obtained in step S2 above 7 times, then the steel wire is hardened by being drawn, the diameter is 6.92 mm, the resistance is 1,790 MPa, and then the process proceeds to step S4;
    54, cladding:
    1) first degreasing the drawn steel wire, and then cleaning the residual corrosion and impurities on the surface of the steel wire;
    2) after drying, introduction of the steel wire into the intermediate frequency induction heating furnace for a preheating treatment, the steel wire is heated by induction to 380 ° C;
    3) then the steel wire enters a sheathing machine by continuous extrusion, at the same time the aluminum alloy or high purity aluminum bars cleaned, dried and straightened are introduced by the other end of the machine sheathing in the die cavity of the sheathing machine, the temperature of the die cavity of the sheathing machine is 380 to 410 ° C, the shutter pressure is 62 MPa, and the sheathing speed is 55 m / min. In this process, the pressing wheels continuously introduce the bars of aluminum alloy or high purity aluminum into the die cavity. The aluminum bars are softened by heat, and are uniformly pressed around the steel wire. A layer of aluminum is continuously removed by the friction between the moving steel wire and the softened aluminum, and after bonding, the aluminum cladding layer which tightly envelops the steel wire with a firm and close bond is formed, and the thickness of the aluminum layer is 0.04mm, the aluminum layer is closely combined with the steel wire to form a nested layer of steel and aluminum. After cooling and drying, an aluminum sheathed steel wire is obtained, the aluminum sheathed steel wire has a resistance of 1,750 MPa and it is then sent to step S5 of the process;
    55, stabilization treatment:
    Application of a tension of 27,000 N to aluminum-coated steel wire, the speed of introduction of aluminum-coated steel wire is controlled at 80 m / min. Under these conditions, the aluminum-coated steel wire is subjected to induction heating at intermediate frequency, the heating temperature is controlled at 380 ° C., the stress of the internal tissue is eliminated, and the stabilization is completed.
    56, inspection: the aluminum-coated steel wire, after the stabilization treatment, is picked up by a take-up reel, the surface quality and the thickness of the aluminum layer are inspected, and then the performance is inspected according to standard GB / T17101-2008, the resistance of steel wire sheathed in aluminum is 1730 MPa, Rp 0, 2 is 1540 MPa, and the stress relaxation rate was 1.8% after 1,000 hours under conditions where the initial charge is 70% of the nominal charge. Embodiment 2:
    In this embodiment, a high resistance grade II relaxation coated aluminum steel wire having a diameter of 7.00 mm is produced:
    51, preparation of the raw material: the wire rod prepared for the bridge cable adopts the Baosteel 92MnQL grade, the size of the raw material is 14.00 mm, the resistance of the raw material is detected to be 1400 MPa, and the method proceeds to step S2;
    52, implementation of a surface treatment on the wire rod: pickling, phosphating, neutralization, and drying of the wire rod;
    a) pickling: pickling of the wire rod for the bridge cable, pickling with acid is carried out using industrial hydrochloric acid, the concentration of hydrochloric acid is 24%, the pickling time is 44 minutes;
    b) phosphating: the wire rod for acid-washed bridge cable is further subjected to a phosphating treatment, the total acidity of the phosphating solution is 68 degrees, the temperature is 74 ° C., and the immersion phosphating time is 5 minutes;
    c) neutralization: the wire rod for the bridge cable, after the two steps above, is put in the lime basin for 6 minutes, and then removed therefrom;
    d) drying: the wire rope for bridge cable having passed the above three stages is dried naturally, and the wire rod for dried bridge cable is assembled on a wire drawing machine so that it is prepared for the step S3 of the process.
    53, stretching:
    The wire drawing machine continuously draws the wire rod obtained in step S2 above 9 times, then the steel wire is hardened by being drawn, the diameter is 6.89 mm, the resistance is 1,920 MPa, and then the process proceeds to step S4;
    54, cladding:
    1) first degreasing the drawn steel wire, and then cleaning the residual corrosion and impurities on the surface of the steel wire;
    2) after drying, introduction of the steel wire into the intermediate frequency induction heating furnace for a preheating treatment, the steel wire is heated by induction to 420 ° C;
    3) then the steel wire enters the sheathing machine by continuous extrusion, at the same time the aluminum alloy or high purity aluminum bars cleaned, dried and straightened are introduced by the other end of the machine sheathing in the die cavity of the sheathing machine, the temperature of the die cavity of the sheathing machine is from 410 to 430 ° C, the shutter pressure is 80 MPa, and the sheathing speed is 140 m / min. In this process, the pressing wheels continuously introduce the bars of aluminum alloy or high purity aluminum into the die cavity. The aluminum bars are softened by heat, and are uniformly pressed around the steel wire. Aluminum is continuously removed by the friction between the moving steel wire and the softened aluminum, and after bonding, the aluminum sheathing layer which tightly wraps the steel wire with a firm and close bond is formed, and the thickness of the aluminum layer is 0.08mm, the aluminum layer is closely combined with the steel wire to form a nested layer of steel and aluminum. After cooling and drying, an aluminum-clad steel wire is obtained, the aluminum-clad steel wire has a resistance of 1840 MPa and it is then sent to step S5 of the process;
    55, stabilization treatment:
    Application of a tension of 33,000 N to aluminum-coated steel wire, the speed of introduction of aluminum-coated steel wire is controlled at 160 m / min. Under these conditions, the aluminum-coated steel wire is subjected to induction heating at intermediate frequency, the heating temperature is controlled at 410 ° C., the stress of the internal tissue is eliminated, and the stabilization is completed.
    S6, inspection: the aluminum-coated steel wire, after the stabilization treatment, is picked up by a take-up reel, the surface quality and the thickness of the aluminum layer are inspected, and then the performance is inspected according to standard GB / T17101-2008, the resistance of steel wire sheathed in aluminum is 1820 MPa, Rp 0, 2 is 1620 MPa, and the stress relaxation rate was 1.7% after 1,000 hours under conditions where the initial charge is 70% of the nominal charge.
    Embodiment 3:
    In the present embodiment, a steel wire sheathed in high strength grade II relaxation aluminum having a diameter of 7.00 mm is produced:
    51, preparation of the raw material: the wire rod prepared for the bridge cable can adopt the Baosteel 97MnQL grade, the size of the raw material is 14.00 mm, the resistance of the raw material is detected to be 1520 MPa , and the method goes to step S2;
    52, implementation of a surface treatment on the wire rod: pickling, phosphating, neutralization, and drying of the wire rod;
    a) pickling: pickling of the wire rod for the bridge cable, pickling with acid is carried out using industrial hydrochloric acid, the concentration of hydrochloric acid is 20%, the pickling time is 40 minutes;
    b) phosphating: the wire rod for bridge cable washed with acid is further subjected to a phosphating treatment, the total acidity of the phosphating solution is 65 degrees, the temperature is 70 ° C., and the immersion phosphating time is 5 minutes;
    c) neutralization: the wire rod for bridge cable, after the above two steps, is put in the lime basin for 5 minutes, and then removed therefrom;
    d) drying: the wire rope for bridge cable having passed the above three stages is dried naturally, and the wire rod for dried bridge cable is assembled on a wire drawing machine so that it is prepared for the step S3 of the process.
    53, stretching:
    The wire drawing machine continuously draws the wire rod obtained in step S2 above 9 times, then the steel wire is hardened by being drawn, the diameter is 6.87 mm, the resistance is 2020 MPa, and then the process proceeds to step S4;
    54, cladding:
    1) first degreasing the drawn steel wire, and then cleaning the residual corrosion and impurities on the surface of the steel wire;
    2) after drying, introduction of the steel wire into the intermediate frequency induction heating furnace for a preheating treatment, the steel wire is induction heated to 410 ° C;
    3) then the steel wire enters the sheathing machine by continuous extrusion, at the same time the aluminum alloy or high purity aluminum bars cleaned, dried and straightened are introduced by the other end of the machine sheathing in the die cavity of the sheathing machine, the temperature of the die cavity of the sheathing machine is 400 to 420 ° C, the shutter pressure is 70 MPa, and the sheathing speed is 130 m / min. In this process, the pressing wheel continuously feeds the bars of aluminum alloy or high purity aluminum into the die cavity. The aluminum bars are softened by heat, and are uniformly pressed around the steel wire. A layer of aluminum is continuously removed by the friction between the moving steel wire and the softened aluminum, and after bonding, the aluminum cladding layer which tightly envelops the steel wire with a firm and close bond is formed, and the thickness of the aluminum layer is 0.09mm, the aluminum layer is closely combined with the steel wire to form a nested layer of steel and aluminum. After cooling and drying, an aluminum-clad steel wire is obtained, the aluminum-clad steel wire has a resistance of 1,960 MPa and it is then sent to step S5 of the process;
    55, stabilization treatment:
    Application of a tension of 32,000 N to aluminum-coated steel wire, the speed of introduction of aluminum-coated steel wire is controlled at 120 m / min. Under these conditions, the aluminum-coated steel wire is subjected to induction heating at intermediate frequency, the heating temperature is controlled at 390 ° C., the stress of the internal tissue is eliminated, and the stabilization is completed.
    56, inspection: the aluminum-coated steel wire, after the stabilization treatment, is picked up by a take-up reel, the surface quality and the thickness of the aluminum layer are inspected, and then the performance is inspected according to standard GB / T17101-2008, the resistance of steel wire sheathed in aluminum is 1940 MPa, Rp 0, 2 is 1727 MPa, and the stress relaxation rate was 1.6% after 1,000 hours under conditions where the initial charge is 70% of the nominal charge. Embodiment 4:
    In the present embodiment, a steel wire sheathed in high strength grade II relaxation aluminum having a diameter of 7.00 mm is produced:
    IF, preparation of the raw material: the wire rod prepared for the bridge cable adopts the Baosteel 97MnQL grade, the size of the raw material is 14.00 mm, the resistance of the raw material is detected to be 1550 MPa, and the method proceeds to step S2;
    52, implementation of a surface treatment on the wire rod: pickling, phosphating, neutralization, and drying of the wire rod;
    a) pickling: pickling of the wire rod for the bridge cable, pickling with acid is carried out by using industrial hydrochloric acid, the concentration of hydrochloric acid is 22%, the pickling time is 42 minutes;
    b) phosphating: the wire rod for bridge cable washed with acid is further subjected to a phosphating treatment, the total acidity of the phosphating solution is 60 degrees, the temperature is 73 ° C., and the immersion phosphating time is 5 minutes;
    c) neutralization: the wire rod for bridge cable, after the above two steps, is put in the lime basin for 5 minutes, and then removed therefrom;
    d) drying: the wire rope for bridge cable having passed the above three stages is dried naturally, and the wire rod for dried bridge cable is assembled on the wire drawing machine so that it is prepared for the step S3 of the method;
    53, stretching:
    The wire drawing machine continuously draws the wire rod obtained in step S2 above 9 times, then the steel wire is hardened by being drawn, the diameter is 6.90 mm, the resistance is 2,100 MPa, and then the process proceeds to step S4;
    54, cladding:
    1) first degreasing the drawn steel wire, and then cleaning the residual corrosion and impurities on the surface of the steel wire;
    2) after drying, introduction of the steel wire into the induction heating furnace at intermediate frequency for a preheating treatment, the steel wire is heated by induction to 400 ° C;
    3) then the steel wire enters the sheathing machine by continuous extrusion, at the same time the bar of aluminum alloy or of high purity aluminum cleaned, dried and straightened is introduced by the other end of the machine sheathing in the die cavity of the sheathing machine, the temperature of the die cavity of the sheathing machine is 390 to 410 ° C, the shutter pressure is 75 MPa, and the sheathing speed is 80 m / min. In this process, the pressing wheel continuously introduces the aluminum alloy or high purity aluminum bar into the die cavity. The aluminum bar is softened by heat, and is uniformly pressed around the steel wire. A layer of aluminum is continuously removed by the friction between the moving steel wire and the softened aluminum, and after bonding, the aluminum cladding layer which tightly envelops the steel wire with a firm and close bond is formed, and the thickness of the aluminum layer is 0.10 mm, the aluminum layer is closely combined with the steel wire to form an overlapping layer of steel and aluminum. After cooling and drying, an aluminum sheathed steel wire is obtained, the aluminum sheathed steel wire has a resistance of 2050 MPa and it is then sent to step S5 of the process;
    55, stabilization treatment:
    Application of a tension of 33,000 N to aluminum-coated steel wire, the speed of introduction of aluminum-coated steel wire is controlled at 100 m / min. Under these conditions, the aluminum-clad steel wire is subjected to induction heating at intermediate frequency, the heating temperature is controlled at 400 ° C., the stress of the internal tissue is eliminated, and the stabilization is completed.
    56, inspection: the aluminum-coated steel wire, after the stabilization treatment, is picked up by a take-up reel, the surface quality and the thickness of the aluminum layer are inspected, and then the performance is inspected in accordance with standard GB / T17101-2008, the resistance of the aluminum-clad steel wire is 2,040 MPa, Rpo, 2 is 1,815 MPa, and the stress relaxation rate is 1.8% after 1 000 hours under conditions where the initial charge is 70% of the nominal charge.
    Embodiment 5:
    In the present embodiment, a high resistance grade II relaxation coated aluminum steel wire having a diameter of 5.00 mm is produced:
    51, preparation of the raw material: the wire rod prepared for the bridge cable can adopt the Baosteel 82MnQL grade, the size of the raw material is 11.00 mm, the resistance of the raw material is detected to be 1250 MPa , and the method goes to step S2;
    52, implementation of a surface treatment on the wire rod: pickling, phosphating, neutralization, and drying of the wire rod;
    a) pickling: pickling of the wire rod for the bridge cable, pickling with acid is carried out using industrial hydrochloric acid, the concentration of hydrochloric acid is 18%, the pickling time is 39 minutes;
    b) phosphating: the wire rod for bridge cable washed with acid is further subjected to a phosphating treatment, the total acidity of the phosphating solution is 60 degrees, the temperature is 72 ° C., and the immersion phosphating time is 4 minutes;
    c) neutralization: the wire rod for the bridge cable, after the two steps above, is put in the lime basin for 4 minutes, and then removed therefrom;
    d) drying: the wire rope for bridge cable having passed the above three stages is dried naturally, and the wire rod for dried bridge cable is assembled on the wire drawing machine so that it is prepared for the step S3 of the process.
    53, stretching:
    The wire drawing machine continuously draws the wire rod obtained in step S2 above 8 times, then the steel wire is hardened by being drawn, the diameter is 4.89 mm, the resistance is 1,800 MPa, and then the process proceeds to step S4;
    54, cladding:
    1) first degreasing the drawn steel wire, and then cleaning the residual corrosion and impurities on the surface of the steel wire;
    2) after drying, introduction of the steel wire into the intermediate frequency induction heating furnace for a preheating treatment, the steel wire is induction heated to 390 ° C;
    3) then the steel wire enters the sheathing machine by continuous extrusion, at the same time the bar of aluminum alloy or of high purity aluminum cleaned, dried and straightened is introduced by the other end of the machine sheathing in the die cavity of the sheathing machine, the temperature of the die cavity of the sheathing machine is 380 to 400 ° C, the shutter pressure is 67 MPa, and the sheathing speed is 60 m / min. In this process, the pressing wheel continuously introduces the aluminum alloy or high purity aluminum bar into the die cavity. The aluminum bar is softened by heat, and is uniformly pressed around the steel wire. A layer of aluminum is continuously removed by the friction between the moving steel wire and the softened aluminum, and after bonding, the aluminum cladding layer which tightly envelops the steel wire with a firm and close bond is formed, and the thickness of the aluminum layer is 0.08mm, the aluminum layer is closely combined with the steel wire to form a nested layer of steel and aluminum. After cooling and drying, an aluminum-clad steel wire is obtained, the aluminum-clad steel wire has a resistance of 1,760 MPa and it is then sent to step S5 of the process;
    55, stabilization treatment:
    Application of a tension of 28,000 N to aluminum-coated steel wire, the speed of introduction of aluminum-coated steel wire is controlled at 90 m / min. Under these conditions, the aluminum-coated steel wire is subjected to induction heating at intermediate frequency, the heating temperature is controlled at 390 ° C., the stress of the internal tissue is eliminated, and the stabilization is completed.
    56, inspection: the aluminum-coated steel wire, after the stabilization treatment, is picked up by a take-up reel, the surface quality and the thickness of the aluminum layer are inspected, and then the performance is inspected in accordance with standard GB / T17101-2008, the resistance of the aluminum-clad steel wire is 1,740 MPa, Rpo, 2 is 1,530 MPa, and the stress relaxation rate is 1.7% after 1 000 hours under conditions where the initial charge is 70% of the nominal charge. Embodiment 6:
    In the present embodiment, a high resistance grade II relaxation coated aluminum steel wire having a diameter of 5.00 mm is produced:
    51, preparation of the raw material: the wire rod prepared for the bridge cable adopts the Baosteel 87MnQL grade, the size of the raw material is 11.00 mm, the resistance of the raw material is detected to be 1350 MPa, and the method proceeds to step S2;
    52, implementation of a surface treatment on the wire rod: pickling, phosphating, neutralization, and drying of the wire rod;
    a) pickling: pickling of the wire rod for the bridge cable, pickling with acid is carried out using industrial hydrochloric acid, the concentration of hydrochloric acid is 16%, the pickling time is 32 minutes;
    b) phosphating: the machine wire for acid-washed bridge cable is further subjected to a phosphating treatment, the total acidity of the phosphating solution is 56 degrees, the temperature is 74 ° C., and the immersion phosphating time is 3 minutes;
    c) neutralization: the wire rod for the bridge cable, after the two steps above, is put in the lime basin for 4 minutes, and then removed therefrom;
    d) drying: the wire rope for bridge cable having passed the above three stages is dried naturally, and the wire rod for dried bridge cable is assembled on the wire drawing machine so that it is prepared for the step S3 of the process.
    53, stretching:
    The wire drawing machine continuously draws the wire rod obtained in step S2 above 8 times, then the steel wire is hardened by being drawn, the diameter is 4.93 mm, the resistance is 1,900 MPa, and then the process proceeds to step S4;
    54, cladding:
    1) first degreasing the drawn steel wire, and then cleaning the residual corrosion and impurities on the surface of the steel wire;
    2) after drying, introduction of the steel wire into the intermediate frequency induction heating furnace for a preheating treatment, the steel wire is induction heated to 390 ° C;
    3) then the steel wire enters the sheathing machine by continuous extrusion, at the same time the bar of aluminum alloy or of high purity aluminum cleaned, dried and straightened is introduced by the other end of the machine sheathing in the die cavity of the sheathing machine, the temperature of the die cavity of the sheathing machine is 380 to 400 ° C, the shutter pressure is 65 MPa, and the sheathing speed is 130 m / min. In this process, the pressing wheel continuously introduces the aluminum alloy or high purity aluminum bar into the die cavity. The aluminum bar is softened by heat, and is uniformly pressed around the steel wire. A layer of aluminum is continuously removed by the friction between the moving steel wire and the softened aluminum, and after bonding, the aluminum cladding layer which tightly envelops the steel wire with a firm and close bond is formed, and the thickness of the aluminum layer is 0.03mm, the aluminum layer is closely combined with the steel wire to form a nested layer of steel and aluminum. After cooling and drying, an aluminum sheathed steel wire is obtained, the aluminum sheathed steel wire has a resistance of 1860 MPa and it is then sent to step S5 of the process;
    55, stabilization treatment:
    Application of a tension of 29,000 N to aluminum-coated steel wire, the speed of introduction of aluminum-coated steel wire is controlled at 110 m / min. Under these conditions, the aluminum-coated steel wire is subjected to induction heating at intermediate frequency, the heating temperature is controlled at 380 ° C., the stress of the internal tissue is eliminated, and the stabilization is completed.
    56, inspection: the aluminum-coated steel wire, after the stabilization treatment, is picked up by a take-up reel, the surface quality and the thickness of the aluminum layer are inspected, and then the performance is inspected in accordance with GB / T17101-2008, the resistance of the aluminum-clad steel wire is 1,830 MPa, Rpo, 2 is 1,620 MPa, and the stress relaxation rate is 2.0% after 1 000 hours under conditions where the initial charge is 70% of the nominal charge.
    Embodiment 7:
    In the present embodiment, a high resistance grade II relaxation coated aluminum steel wire having a diameter of 5.00 mm is produced:
    51, preparation of the raw material: the wire rod prepared for the bridge cable adopts the Baosteel 87MnQL grade, the size of the raw material is 12.50 mm, the resistance of the raw material is detected to be 1300 MPa, and the method proceeds to step S2;
    52, implementation of a surface treatment on the wire rod: pickling, phosphating, neutralization, and drying of the wire rod;
    a) pickling: pickling of the wire rod for the bridge cable, pickling with acid is carried out using industrial hydrochloric acid, the concentration of hydrochloric acid is 19%, the pickling time is 38 minutes;
    b) phosphating: the machine wire for acid-washed bridge cable is further subjected to a phosphating treatment, the total acidity of the phosphating solution is 58 degrees, the temperature is 71 ° C., and the immersion phosphating time is 5 minutes;
    c) neutralization: the wire rod for the bridge cable, after the two steps above, is put in the lime basin for 4 minutes, and then removed therefrom;
    d) drying: the wire rope for bridge cable having passed the above three stages is dried naturally, and the wire rod for dried bridge cable is assembled on the wire drawing machine so that it is prepared for the step S3 of the process.
    53, stretching:
    The wire drawing machine continuously draws the wire rod obtained in step S2 above 8 times, then the steel wire is hardened by being drawn, the diameter is 4.92 mm, the resistance is 1,970 MPa, and then the process proceeds to step S4;
    54, cladding:
    1) first degreasing the drawn steel wire, and then cleaning the residual corrosion and impurities on the surface of the steel wire;
    2) after drying, introduction of the steel wire into the intermediate frequency induction heating furnace for a preheating treatment, the steel wire is induction heated to 410 ° C;
    3) then the steel wire enters the sheathing machine by continuous extrusion, at the same time the bar of aluminum alloy or of high purity aluminum cleaned, dried and straightened is introduced by the other end of the machine sheathing in the die cavity of the sheathing machine, the temperature of the die cavity of the sheathing machine is 400 to 420 ° C, the shutter pressure is 80 MPa, and the sheathing speed is 120 m / min. In this process, the pressing wheel continuously introduces the aluminum alloy or high purity aluminum bar into the die cavity. The aluminum bar is softened by heat, and is uniformly pressed around the steel wire. A layer of aluminum is continuously removed by the friction between the moving steel wire and the softened aluminum, and after bonding, the aluminum cladding layer which tightly envelops the steel wire with a firm and close bond is formed, and the thickness of the aluminum layer is 0.09mm, the aluminum layer is closely combined with the steel wire to form a nested layer of steel and aluminum. After cooling and drying, an aluminum-clad steel wire is obtained, the aluminum-clad steel wire has a resistance of 1,930 MPa and it is then sent to step S5 of the process;
    55, stabilization treatment:
    Application of a tension of 29,000 N to aluminum-coated steel wire, the speed of introduction of aluminum-coated steel wire is controlled at 100 m / min. Under these conditions, the aluminum-clad steel wire is subjected to induction heating at intermediate frequency, the heating temperature is controlled at 400 ° C., the stress of the internal tissue is eliminated, and the stabilization is completed.
    56, inspection: the aluminum-coated steel wire, after the stabilization treatment, is picked up by a take-up reel, the surface quality and the thickness of the aluminum layer are inspected, and then the performance is inspected in accordance with GB / T17101-2008 standard, the resistance of steel wire sheathed in aluminum is 1910 MPa, Rp 0, 2 is 1700 MPa, and the stress relaxation rate was 1.6% after 1
    000 hours under conditions where the initial charge is 70% of the nominal charge. Embodiment 8:
    In the present embodiment, a high resistance grade II relaxation coated aluminum steel wire having a diameter of 5.00 mm is produced:
    51, preparation of the raw material: the wire rod prepared for the bridge cable adopts the Baosteel 90SÎQL grade, the size of the raw material is 11.00 mm, the resistance of the raw material is detected to be 1350 MPa, and the method proceeds to step S2;
    52, implementation of a surface treatment on the wire rod: pickling, phosphating, neutralization, and drying of the wire rod;
    a) pickling: pickling of the wire rod for the bridge cable, pickling with acid is carried out by using industrial hydrochloric acid, the concentration of hydrochloric acid is 24%, the pickling time is 45 minutes;
    b) phosphating: the wire rod for bridge cable washed with acid is further subjected to a phosphating treatment, the total acidity of the phosphating solution is 70 degrees, the temperature is 75 ° C., and the immersion phosphating time is 54 minutes;
    c) neutralization: the wire rod for the bridge cable, after the two steps above, is put in the lime basin for 6 minutes, and then removed therefrom;
    d) drying: the wire rope for bridge cable having passed the above three stages is dried naturally, and the wire rod for dried bridge cable is assembled on the wire drawing machine so that it is prepared for the step S3 of the process.
    53, stretching:
    The wire drawing machine continuously draws the wire rod obtained in step S2 above 9 times, then the steel wire is hardened by being drawn, the diameter is 4.92 mm, the resistance is 2,100 MPa, and then the process proceeds to step S4;
    54, cladding:
    1) first degreasing the drawn steel wire, and then cleaning the residual corrosion and impurities on the surface of the steel wire;
    2) after drying, introduction of the steel wire into the induction heating furnace at intermediate frequency for a preheating treatment, the steel wire is heated by induction to 400 ° C;
    3) then the steel wire enters the sheathing machine by continuous extrusion, at the same time the bar of aluminum alloy or of high purity aluminum cleaned, dried and straightened is introduced by the other end of the machine sheathing in the die cavity of the sheathing machine, the temperature of the die cavity of the sheathing machine is 400 to 420 ° C, the shutter pressure is 80 MPa, and the sheathing speed is 120 m / min. In this process, the pressing wheel continuously introduces the aluminum alloy or high purity aluminum bar into the die cavity. The aluminum bar is softened by heat, and is uniformly pressed around the steel wire. A layer of aluminum is continuously removed by the friction between the moving steel wire and the softened aluminum, and after bonding, the aluminum cladding layer which tightly envelops the steel wire with a firm and close bond is formed, and the thickness of the aluminum layer is 0.08mm, the aluminum layer is closely combined with the steel wire to form a nested layer of steel and aluminum. After cooling and drying, an aluminum-clad steel wire is obtained, the aluminum-clad steel wire has a resistance of 2,060 MPa and it is then sent to step S5 of the process;
    55, stabilization treatment:
    Application of a tension of 29,000 N to aluminum-coated steel wire, the speed of introduction of aluminum-coated steel wire is controlled at 90 m / min. Under these conditions, the aluminum-clad steel wire is subjected to induction heating at intermediate frequency, the heating temperature is controlled at 400 ° C., the stress of the internal tissue is eliminated, and the stabilization is completed.
    56, inspection: the aluminum-coated steel wire, after the stabilization treatment, is picked up by a take-up reel, the surface quality and the thickness of the aluminum layer are inspected, and then the performance is inspected in accordance with standard GB / T17101-2008, the resistance of the aluminum-clad steel wire is 2,040 MPa, Rpo > 2 is 1,810 MPa, and the stress relaxation rate is 1.8% after
    000 hours under conditions where the initial charge is 70% of the nominal charge.
    The performance comparison between the comparative embodiment implemented by the document ZL200710051322.9 and the embodiments of the present invention is presented in Table 1.
    Table 1: comparison of effects between the embodiment of document ZL2007100513229 and the embodiments of the present invention.
    [Tables 1]
    Redisatron modes Diameter of the steel wire sheathed with ateminum ,. mm Resistance level,MPa Measured resistance, MPa ^ Ao ··MPa ReiasQdsn performance under stress,% Motte of achievement1 7.00 1,570 .1,730 .1 540 1, S Mode of realizationComparative 7.0 to 0 1,570 1,680 1,510 5.9 Dead of achievement2 7.80 1,778 1,820 1,620 ' 1.7 Comparative embodiment 7.98 1,770 1790 1,680 6.0 Mode of realization3 7.90 1,860 1940 1,727 1.6 Comparative embodiment 7 œ 1,860 1,880 1,680 7./5 Mode of realization4 7.00 2 œo 2,040 1,815 1.8 Comparative embodiment 7.00 2,000 2015 1,800 7.0 Mode of realization5 ' 5.8 1,570 ï 740 1,530 1.7 Comparative embodiment 5.9 1,670 1,670 1490 0,., 0 Mode of realization6 5.0 1,77G 1,330 1,620 2.9 Comparative embodiment 5.0 1,778 1780 .1,500Mode of realization7 5.0 1,868 1,910 1,780 1.6 Comparative embodiment 5.8 1,860 1,890 1,650 7.8 Mode of realizationS 5.8 2,800 2,040 1810 1.8 Comparative embodiment 5.8 2,800 2,010 1,790 7.2
    Where: 1. Rp 0 , 2 indicates the specified extension resistance and not proportional. 2. The stress relaxation performance means the stress relaxation rate after 1000 hours when the sample temperature is maintained at 20 ± 2 ° C and the initial load is 70% of the nominal load.
    From the comparison of the performance indices of the comparative embodiment of Table 1 and of the embodiments of the present invention, it can be seen that the stress relaxation performance of the comparative embodiment of the same level of intensity can only meet the requirement that level I relaxation not exceed 7.5%, and the intensity range is not important. In the embodiments of the invention, the resistance margin is large, and the requirement that the relaxation of grade II does not exceed 2.5% can be satisfied, and a steel wire sheathed with high aluminum. quality can be obtained for a long life and high grade bridge.
    The above are only preferred embodiments of the present invention, and it should be noted that those skilled in the art can make improvements and modifications without departing from the technical principles of the present invention. The improvements and variants are also considered to fall within the scope of the present invention.
    权利要求:
    Claims (1)
    [1" id="c-fr-0001]
    Method for manufacturing a grade II relaxation aluminum sheathed steel wire for a bridge cable, the method comprising the following steps:
    51, preparation of the raw material: preparation of wire rods for bridge cables having the corresponding product specifications;
    52, surface treatment of the wire rod: implementation of a surface treatment of the wire rod for the bridge cable;
    53, drawing: the wire rod is drawn continuously into a steel wire meeting the specifications by means of a wire drawing machine, and after hardening by drawing, the resistance of the steel wire formed reaches 1,770- 2,100 MPa, and then the steel wire is subjected to the sheathing process;
    54, sheathing: first degreasing of the drawn steel wire, and then cleaning of the residual rust on the surface of the steel wire; after drying, introduction of the steel wire into an induction heating furnace at intermediate frequency for a preheating treatment, the wire is heated by induction to 370-420 ° C, and then enters a sheathing machine by continuous extrusion ; at the same time, the high purity aluminum bar or the aluminum alloy bar, after having been cleaned, dried and straightened, is introduced into the die cavity of the sheathing machine by the other end of the sheathing machine ; the temperature in the cavity of the cladding machine is 380 to 430 ° C, the shutter pressure is 60 to 80 MPa, the cladding speed is 50 to 150 m / min; the thickness of the cladding aluminum layer is different depending on different strength requirements and, after cooling and drying, an aluminum clad steel wire is obtained, and the aluminum clad steel wire has a resistance in the range from 1,720 to 2,060 MPa;
    55, stabilization treatment: application of a certain tension to the steel wire sheathed in aluminum, the tension is 38 to 48% of the actual breaking force of the steel wire sheathed in aluminum; under these conditions, the aluminum-coated steel wire is heated by induction at medium frequency, and the heating temperature is controlled between 370 ° C. and 420 ° C., the stress of the internal tissue is eliminated and the stabilization treatment is finished.
    Method for manufacturing an aluminum sheathed steel wire with relaxation of [Claim 3] [Claim 4] [Claim 5] [Claim 6] [Claim 7] [Claim 8] grade II for a bridge cable according to claim 1 , which method further comprises:
    S6, inspection: the stabilized aluminum sheathed steel wire is captured by a take-up reel, the surface quality and the thickness of the aluminum layer are inspected, and then the performance inspection is carried out in accordance with a predetermined standard; the strength of the aluminum-clad steel wire is in the range from 1,700 to 2,040 MPa and the grade II relaxation rate is not more than 2.0%. A method for manufacturing a grade II relaxation aluminum sheathed steel wire for a bridge cable according to one of claims 1 or 2, wherein step S2 comprises pickling, phosphating, neutralization, and a wire rod drying.
    Process for manufacturing a grade II relaxation aluminum sheathed steel wire for a bridge cable according to claim 3, in which pickling is carried out using industrial hydrochloric acid, the concentration of hydrochloric acid is 12 at 25%, and the pickling time is 30 to 45 minutes.
    Method for manufacturing a grade II aluminum sheathed steel wire for a bridge cable according to one of Claims 3 or 4, in which, in the phosphating step, the total acidity of the phosphating used is 50 to 70 degrees and the temperature is 70 ° C to 75 ° C, the time of phosphating by immersion is 3 to 5 minutes. Method for manufacturing a grade II aluminum sheathed steel wire for a bridge cable according to one of claims 1 to 5, in which, in step S3, the drawing is carried out 7 to 9 times .
    Method for manufacturing a grade II relaxation aluminum sheathed steel wire for a bridge cable according to one of claims 1 to 6, in which, in step S4, the aluminum layer of the wire Aluminum-clad steel has a thickness of 0.03 to 0.10 mm to form a nested layer of steel and aluminum.
    Method for manufacturing a grade II relaxation aluminum sheathed steel wire for a bridge cable according to one of Claims 1 to 7, in which, in step S5, the speed of introduction of the wire Aluminum-clad steel is controlled to be 80 to 180 m / min.
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    优先权:
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    CN201810363376.7|2018-04-21|
    CN201810363376.7A|CN108580578B|2018-04-21|2018-04-21|A kind of manufacturing method of II grade of loose aluminum cald steel wire of bridge cable|
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