Corrosion-resistant steel wire rope and preparation method thereof

Abstract

The present invention discloses a corrosion-resistant steel wire rope and its preparation method. First, a cylindrical steel billet is smelted, argon-blown, and cast according to the chemical composition of the formula. The surface is nano-treated, yttrium-infiltrated, and high-speed wire rod controlled rolling and cooling is performed to obtain a wire rod with a diameter of 6 to 8 mm. The wire rod is then ultrasonically cleaned, solution-treated, and drawn to obtain a coarse steel wire with a diameter of 2 to 3 mm. The coarse steel wire is completely immersed in a polytungstic acid sol, quickly removed, and vacuum-heat-treated to obtain a pre-treated coarse steel wire. The pre-treated coarse steel wire is then further drawn to obtain a fine steel wire with a diameter of 0.2 to 0.3 mm. Finally, the fine steel wire is boronized and twisted into a steel wire rope. The steel wire rope obtained by the present invention has high strength and excellent corrosion resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of steel wire rope preparation, and particularly relates to a corrosion-resistant steel wire rope and a preparation method thereof. Background Art

[0002] The demand for high-strength and high-toughness steel wire ropes is increasing. They are used in many fields such as automobiles, roads, bridges, and in the processing of wire rope nets.

[0003] Steel wire rope is made from twisted steel wire. During production, the steel wire undergoes continuous cold drawing to produce wires of varying diameters. The primary factor influencing the wire's drawing performance is its plasticity, which depends on its chemical composition. Only wires with the appropriate chemical composition and drawing process can minimize wire breakage and maintain excellent strength and toughness.

[0004] Patent CN107497868B discloses a steel wire drawing method that involves coating a lubricating coolant on the surface of a metal precursor, followed by a first-stage drawing, annealing, a second-stage drawing, and heat treatment to produce the steel wire. The lubricating coolant is prepared from carbon nanotubes, epoxy resin, an aminosilane coupling agent, an emulsifier, and water. This patented technology primarily relies on the high performance of carbon nanotubes, which are relatively expensive to use, making it difficult to commercialize.

[0005] In addition, wire ropes are often exposed to harsh environments, so corrosion resistance is very necessary.

[0006] Patent application CN109355954A discloses a corrosion-resistant steel wire rope manufacturing process, including the following steps: pretreatment, drawing, heat treatment, stranding, and coating with a film layer. The patent application does not provide a detailed description of the composition of the coating layer, and the film's adhesion to the wire rope surface is not guaranteed. Once corrosion pits appear, corrosive elements will enter the wire rope, causing corrosion and damage, seriously shortening the wire rope's service life. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the object of the present invention is to provide a corrosion-resistant steel wire rope and a preparation method thereof, which has good strength and corrosion resistance.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A method for preparing a corrosion-resistant steel wire rope, comprising the following specific steps:

[0010] (1) First, according to the chemical composition of the formula, smelting, argon blowing, and casting are performed to obtain cylindrical steel billets, surface nano-treatment, yttrium infiltration treatment, high-speed wire controlled rolling and controlled cooling treatment, and wires with a diameter of 6 to 8 mm are obtained;

[0011] (2) The wire is then ultrasonically cleaned, solution treated, and drawn to obtain a thick steel wire with a diameter of 2 to 3 mm;

[0012] (3) completely immersing the thick steel wire in the polytungstic acid sol, quickly taking it out, and vacuum heat treating it to obtain the pretreated thick steel wire;

[0013] (4) The pretreated thick steel wire is further drawn to obtain a thin steel wire with a diameter of 0.2 to 0.3 mm;

[0014] (5) Finally, the fine steel wire is subjected to boronizing treatment and twisted into a steel wire rope.

[0015] Preferably, in step (1), the chemical composition is as follows, in percentage by mass: carbon 0.7-0.8%, silicon 0.2-0.3%, nitrogen 0.1-0.2%, nickel 2.5-2.7%, manganese 0.6-0.8%, chromium 0.6-0.8%, vanadium 0.08-0.1%, molybdenum 0.05-0.07%, niobium 0.02-0.03%, phosphorus 0.03-0.04%, cerium 0.01-0.02%, boron 0.002-0.003%, sulfur 0.001-0.002%, and the balance is iron and unavoidable impurities.

[0016] Preferably, in step (1), the smelting temperature is 1550-1600°C.

[0017] Preferably, in step (1), the process conditions for blowing argon are: argon flow rate 30-35 L / min, and treatment time 50-60 minutes.

[0018] Preferably, in step (1), the diameter of the cylindrical steel billet is 100-110 mm and the length is 4-5 m.

[0019] Preferably, in step (1), the specific method of surface nano-treatment is: using a friction head to perform circular reciprocating motion on the surface of the steel billet at 10 to 15 r / min for 200 to 220 minutes, and heat treating at 500 to 550°C and a vacuum degree of 0.03 to 0.05 Pa for 250 to 300 minutes; wherein the distance between the friction head and the surface of the steel billet is less than 15 μm.

[0020] Preferably, in step (1), the specific method of yttrium infiltration treatment is: first, lithium yttrium fluoride, lithium fluoride, and yttrium oxide are uniformly mixed in a molar ratio of 89.55:9.95:0.5, and treated at 630-650°C and a vacuum degree of 100-200 Pa for 2-3 hours to obtain a premixed melt; then, under an argon atmosphere, the pretreated steel billet is placed in the premixed melt, the pretreated steel billet is used as a cathode, and graphite is used as an anode, and electro-reduction yttrium infiltration is performed, the steel billet is taken out, and naturally cooled to room temperature under an argon atmosphere, washed with water, and dried.

[0021] Further preferably, the pretreated steel billet is prepared by the following method: placing the steel billet after surface nano-processing in an atmosphere furnace and treating it for 40 to 50 minutes under the conditions of nitrogen-oxygen mixed gas of 1 atm and temperature of 500 to 520°C; wherein the molar ratio of nitrogen to oxygen in the nitrogen-oxygen mixed gas is 1:8 to 9.

[0022] Further preferably, the process conditions for electro-reduction yttrium infiltration are: temperature 600-620°C, voltage 4.3-4.5V, current density 0.3-0.5A / cm 2 , time 1 to 2 hours.

[0023] Preferably, in step (1), the process conditions for the controlled rolling and controlled cooling treatment of the high-speed wire rod are: rough rolling at 1100-1200°C, finishing rolling at 900-920°C, finishing rolling at 1000-1100°C, water cooling, wire laying at 900-950°C, air cooling at 700-800°C on the air cooling line, and the cooling rate is controlled at 15-20°C / s.

[0024] Preferably, in step (2), the wire is ultrasonically cleaned using a potassium sulfate-sodium oxalate mixed aqueous solution, and the specific process conditions are: temperature 70-80°C, ultrasonic power 300-400W, and treatment time 20-30 minutes; wherein the mass concentrations of potassium sulfate and sodium oxalate contained in the mixed aqueous solution are 10% and 5%, respectively.

[0025] Preferably, in step (2), the process conditions for the solution treatment are: argon flow rate 2 to 3 m 3 / h, temperature 1030~1050℃, solution time 30~40s; water cooling achieves rapid cooling.

[0026] Preferably, in step (2), the thick steel wire is obtained by drawing the steel wire through 7 passes at a speed of 200 to 300 m / min.

[0027] Preferably, in step (3), the polytungstic acid sol is prepared by the following method: adding tungsten powder to a 30% by mass concentration hydrogen peroxide solution, continuously stirring until the tungsten powder is completely dissolved, centrifuging to obtain the supernatant, adding anhydrous ethanol, stirring and mixing, and heating and distilling under reduced pressure to obtain the sol; wherein the mass ratio of tungsten powder, hydrogen peroxide solution, and anhydrous ethanol is 1:10-12:80-90, and the process conditions of the reduced pressure distillation are: temperature 50-55°C, pressure 20-30Pa, and time 20-25 minutes.

[0028] Preferably, in step (3), the process conditions of the vacuum heat treatment are: treatment at 1100-1200° C. and a vacuum degree of 10-20 Pa for 2-3 hours.

[0029] Preferably, in step (4), the fine steel wire is obtained by drawing the steel wire 14 times at a speed of 100 to 120 m / min.

[0030] Preferably, in step (5), the specific method of boronizing treatment is: completely immerse the thin steel wire in the boronizing solution, with the thin steel wire as the cathode and the graphite as the anode, pressurize to 220-300V at room temperature, and take it out after treating for 2-3 minutes.

[0031] Further preferably, the boronizing solution is obtained by mixing the following components in parts by weight: 25-30 parts of sodium fluoroborate, 10-12 parts of potassium hydroxide, 5-6 parts of potassium chloride, 10-12 parts of nickel sulfate, 8-10 parts of titanium sulfate, 20-22 parts of citric acid, and deionized water is added to 1000 parts.

[0032] Preferably, in step (5), the steel wire rope is twisted into a 6×7+IWS structure.

[0033] A corrosion-resistant steel wire rope is obtained by the above-mentioned preparation method.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] First, a cylindrical steel billet is smelted, argon-blown, and cast according to the chemical composition of the formula. The steel billet is then subjected to surface nano-crystallization, yttrium-infiltrating, and high-speed controlled rolling and controlled cooling to obtain a wire with a diameter of 6 to 8 mm. The wire is then ultrasonically cleaned, solution-treated, and drawn to obtain a thick steel wire with a diameter of 2 to 3 mm. The thick steel wire is completely immersed in a polytungstic acid sol, quickly removed, and subjected to vacuum heat treatment to obtain a pre-treated thick steel wire. The pre-treated thick steel wire is then further drawn to obtain a thin steel wire with a diameter of 0.2 to 0.3 mm. The thin steel wire is then boronized and twisted into a steel wire rope. The steel wire rope obtained by the present invention has high strength and good corrosion resistance.

[0036] The specific chemical composition of the present invention (iron, carbon, silicon, nitrogen, nickel, manganese, chromium, vanadium, molybdenum, niobium, phosphorus, cerium, boron, etc.) ensures that the product has good strength and certain corrosion resistance.

[0037] During wire preparation, surface nano-crystallization treatment helps improve surface adhesion for subsequent treatments, enhancing product strength and corrosion resistance. Yttrium infiltration treatment helps improve strength and corrosion resistance, reducing wire breakage during the drawing process.

[0038] The wire is ultrasonically cleaned and solution treated before drawing to reduce the wire breakage rate.

[0039] The thick steel wire is coated with polytungstic acid sol and then vacuum heat treated to form a tungsten oxide coating on the surface, which helps to further improve the strength and corrosion resistance of the product.

[0040] Finally, the fine steel wire is subjected to boronizing treatment, which works synergistically with the previous yttrium infiltration and tungsten oxide coating to enhance the product's strength and corrosion resistance.

[0041] The timing of surface nano-treatment, yttrium treatment, polytungstic acid sol treatment, boron treatment, etc. cannot be changed at will. They work together to improve the microstructure of the product, form more sufficient protection for the surface of the fine steel wire, and ensure that the product has higher strength and corrosion resistance. DETAILED DESCRIPTION

[0042] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] Unless otherwise specified, all commodities in this invention are purchased through market channels.

[0044] Example 1

[0045] A method for preparing a corrosion-resistant steel wire rope, comprising the following specific steps:

[0046] (1) First, according to the chemical composition of the formula, smelting, argon blowing, and casting are performed to obtain cylindrical steel billets, surface nano-treatment, yttrium infiltration treatment, high-speed wire controlled rolling and controlled cooling treatment, and wire rods with a diameter of 6 mm are obtained;

[0047] (2) The wire is then ultrasonically cleaned, solution treated, and drawn to obtain a thick steel wire with a diameter of 2 mm;

[0048] (3) completely immersing the thick steel wire in the polytungstic acid sol, quickly taking it out, and vacuum heat treating it to obtain the pretreated thick steel wire;

[0049] (4) The pretreated thick steel wire is further drawn to obtain a thin steel wire with a diameter of 0.2 mm;

[0050] (5) Finally, the fine steel wire is subjected to boronizing treatment and twisted into a steel wire rope.

[0051] Wherein, in step (1), the chemical composition is as follows, in percentage by mass: carbon 0.7%, silicon 0.2%, nitrogen 0.1%, nickel 2.5%, manganese 0.6%, chromium 0.6%, vanadium 0.08%, molybdenum 0.05%, niobium 0.02%, phosphorus 0.03%, cerium 0.01%, boron 0.002%, sulfur 0.001%, and the balance is iron and unavoidable impurities.

[0052] In step (1), the smelting temperature is 1550°C.

[0053] In step (1), the process conditions for blowing argon are: argon gas flow rate 30 L / min, and processing time 50 minutes.

[0054] In step (1), the diameter of the cylindrical steel billet is 100 mm and the length is 4 m.

[0055] In step (1), the specific method of surface nano-treatment is: using a friction head to perform circular reciprocating motion on the surface of the steel billet at 10 r / min for 200 minutes, and heat treating it at 500°C and a vacuum degree of 0.03 Pa for 250 minutes; wherein the distance between the friction head and the surface of the steel billet is less than 15 μm.

[0056] In step (1), the specific method of yttrium infiltration treatment is: first, lithium yttrium fluoride, lithium fluoride, and yttrium oxide are uniformly mixed in a molar ratio of 89.55:9.95:0.5, and treated at 630°C and a vacuum degree of 100Pa for 2 hours to obtain a premixed melt; then, under an argon atmosphere, the pretreated steel billet is placed in the premixed melt, the pretreated steel billet is used as a cathode, and graphite is used as an anode to perform electro-reduction yttrium infiltration, the steel billet is taken out, and naturally cooled to room temperature under an argon atmosphere, washed with water, and dried.

[0057] The pretreated steel billet is prepared by the following method: placing the steel billet after surface nano-processing in an atmosphere furnace and treating it under the conditions of nitrogen-oxygen mixed gas of 1 atm and temperature of 500°C for 40 minutes; wherein the molar ratio of nitrogen to oxygen in the nitrogen-oxygen mixed gas is 1:8.

[0058] The process conditions for electro-reduction yttrium infiltration are: temperature 600℃, voltage 4.3V, current density 0.3A / cm 2 , time 1 hour.

[0059] In step (1), the process conditions for the controlled rolling and controlled cooling treatment of the high-speed wire rod are: rough rolling at 1100°C, finishing rolling at 900°C, finishing rolling at 1000°C, water cooling, wire drawing at 900°C, air cooling at 700°C on the air cooling line, and the cooling rate is controlled at 15°C / s.

[0060] In step (2), the wire is ultrasonically cleaned using a potassium sulfate-sodium oxalate mixed aqueous solution, and the specific process conditions are: temperature 70°C, ultrasonic power 300W, and treatment time 20 minutes; wherein the mass concentrations of potassium sulfate and sodium oxalate contained in the mixed aqueous solution are 10% and 5%, respectively.

[0061] In step (2), the process conditions for solution treatment are: argon flow rate 2m 3 / h, temperature 1030℃, solution time 30s; water cooling for rapid cooling.

[0062] In step (2), the thick steel wire is obtained by drawing the steel wire through 7 passes at a speed of 200 m / min.

[0063] In step (3), the polytungstic acid sol is prepared by the following method: adding tungsten powder to a 30% by mass concentration hydrogen peroxide solution, continuously stirring until the tungsten powder is completely dissolved, centrifuging to obtain the supernatant, adding anhydrous ethanol, stirring and mixing, and distilling under reduced pressure; wherein the mass ratio of tungsten powder, hydrogen peroxide solution, and anhydrous ethanol is 1:10:80, and the process conditions of the reduced pressure distillation are: temperature 50°C, pressure 20Pa, and time 20 minutes.

[0064] In step (3), the process conditions of vacuum heat treatment are: treatment at 1100° C. and vacuum degree 10 Pa for 2 hours.

[0065] In step (4), the fine steel wire is obtained by drawing the steel wire through 14 passes at a speed of 100 m / min.

[0066] In step (5), the specific method of boronizing treatment is: completely immerse the thin steel wire in the boronizing solution, with the thin steel wire as the cathode and the graphite as the anode, pressurize to 220V at room temperature, and take it out after treating for 2 minutes.

[0067] The boronizing solution is prepared by mixing the following components: 0.25 kg of sodium fluoroborate, 0.1 kg of potassium hydroxide, 0.05 kg of potassium chloride, 0.1 kg of nickel sulfate, 0.08 kg of titanium sulfate, 0.2 kg of citric acid, and adding deionized water to 10 kg.

[0068] In step (5), the steel wire rope is twisted into a 6×7+IWS structure.

[0069] Example 2

[0070] A method for preparing a corrosion-resistant steel wire rope, comprising the following specific steps:

[0071] (1) First, according to the chemical composition of the formula, smelting, argon blowing, and casting are performed to obtain a cylindrical steel billet, surface nano-treatment, yttrium infiltration treatment, high-speed wire controlled rolling and controlled cooling treatment, and a wire with a diameter of 8 mm is obtained;

[0072] (2) The wire is then ultrasonically cleaned, solution treated, and drawn to obtain a thick steel wire with a diameter of 3 mm;

[0073] (3) completely immersing the thick steel wire in the polytungstic acid sol, quickly taking it out, and vacuum heat treating it to obtain the pretreated thick steel wire;

[0074] (4) The pretreated thick steel wire is further drawn to obtain a thin steel wire with a diameter of 0.3 mm;

[0075] (5) Finally, the fine steel wire is subjected to boronizing treatment and twisted into a steel wire rope.

[0076] Wherein, in step (1), the chemical composition is as follows, in percentage by mass: carbon 0.8%, silicon 0.3%, nitrogen 0.2%, nickel 2.7%, manganese 0.8%, chromium 0.8%, vanadium 0.1%, molybdenum 0.07%, niobium 0.03%, phosphorus 0.04%, cerium 0.02%, boron 0.003%, sulfur 0.002%, and the balance is iron and unavoidable impurities.

[0077] In step (1), the smelting temperature is 1600°C.

[0078] In step (1), the process conditions for blowing argon are: argon gas flow rate 35 L / min, and processing time 60 minutes.

[0079] In step (1), the diameter of the cylindrical steel billet is 110 mm and the length is 5 m.

[0080] In step (1), the specific method of surface nano-treatment is: using a friction head to perform circular reciprocating motion on the surface of the steel billet at 15 r / min for 220 minutes, and heat treating it at 550°C and a vacuum degree of 0.05 Pa for 300 minutes; wherein the distance between the friction head and the surface of the steel billet is less than 15 μm.

[0081] In step (1), the specific method of yttrium infiltration treatment is: first, lithium yttrium fluoride, lithium fluoride, and yttrium oxide are uniformly mixed in a molar ratio of 89.55:9.95:0.5, and treated at 650°C and a vacuum degree of 200Pa for 3 hours to obtain a premixed melt; then, under an argon atmosphere, the pretreated steel billet is placed in the premixed melt, the pretreated steel billet is used as a cathode, and graphite is used as an anode to perform electro-reduction yttrium infiltration, the steel billet is taken out, and naturally cooled to room temperature under an argon atmosphere, washed with water, and dried.

[0082] The pretreated steel billet is prepared by the following method: placing the steel billet after surface nano-processing in an atmosphere furnace and treating it under the conditions of nitrogen-oxygen mixed gas of 1 atm and temperature of 520°C for 50 minutes; wherein the molar ratio of nitrogen to oxygen in the nitrogen-oxygen mixed gas is 1:9.

[0083] The process conditions for electro-reduction yttrium infiltration are: temperature 620℃, voltage 4.5V, current density 0.5A / cm 2 , time 2 hours.

[0084] In step (1), the process conditions for the controlled rolling and controlled cooling treatment of the high-speed wire are: rough rolling at 1200°C, finishing rolling at 920°C, finishing rolling at 1100°C, water cooling, wire drawing at 950°C, air cooling at 800°C on the air cooling line, and the cooling rate is controlled at 20°C / s.

[0085] In step (2), the wire is ultrasonically cleaned using a potassium sulfate-sodium oxalate mixed aqueous solution, and the specific process conditions are: temperature 80°C, ultrasonic power 400W, and treatment time 30 minutes; wherein the mass concentrations of potassium sulfate and sodium oxalate contained in the mixed aqueous solution are 10% and 5%, respectively.

[0086] In step (2), the process conditions for solution treatment are: argon flow rate 3m 3 / h, temperature 1050℃, solution time 40s; water cooling for rapid cooling.

[0087] In step (2), the thick steel wire is obtained by drawing the steel wire through 7 passes at a speed of 300 m / min.

[0088] In step (3), the polytungstic acid sol is prepared by the following method: adding tungsten powder to a 30% by mass concentration hydrogen peroxide solution, continuously stirring until the tungsten powder is completely dissolved, centrifuging to obtain the supernatant, adding anhydrous ethanol, stirring and mixing, and distilling under reduced pressure; wherein the mass ratio of tungsten powder, hydrogen peroxide solution, and anhydrous ethanol is 1:12:90, and the process conditions of the reduced pressure distillation are: temperature 55°C, pressure 30Pa, and time 25 minutes.

[0089] In step (3), the process conditions of vacuum heat treatment are: treatment at 1200° C. and vacuum degree 20 Pa for 3 hours.

[0090] In step (4), the fine steel wire is obtained by drawing the wire through 14 passes at a speed of 120 m / min.

[0091] In step (5), the specific method of boronizing treatment is: completely immerse the thin steel wire in the boronizing solution, with the thin steel wire as the cathode and the graphite as the anode, pressurize to 300V at room temperature, and take it out after 3 minutes of treatment.

[0092] The boronizing solution is prepared by mixing the following components: 0.3 kg of sodium fluoroborate, 0.12 kg of potassium hydroxide, 0.06 kg of potassium chloride, 0.12 kg of nickel sulfate, 0.1 kg of titanium sulfate, 0.22 kg of citric acid, and adding deionized water to 10 kg.

[0093] In step (5), the steel wire rope is twisted into a 6×7+IWS structure.

[0094] Example 3

[0095] A method for preparing a corrosion-resistant steel wire rope, comprising the following specific steps:

[0096] (1) First, according to the chemical composition of the formula, smelting, argon blowing, and casting are performed to obtain cylindrical steel billets, surface nano-treatment, yttrium infiltration treatment, high-speed wire controlled rolling and controlled cooling treatment, and wire rods with a diameter of 7 mm are obtained;

[0097] (2) The wire is then ultrasonically cleaned, solution treated, and drawn to obtain a thick steel wire with a diameter of 3 mm;

[0098] (3) completely immersing the thick steel wire in the polytungstic acid sol, quickly taking it out, and vacuum heat treating it to obtain the pretreated thick steel wire;

[0099] (4) The pretreated thick steel wire is further drawn to obtain a thin steel wire with a diameter of 0.2 mm;

[0100] (5) Finally, the fine steel wire is subjected to boronizing treatment and twisted into a steel wire rope.

[0101] Wherein, in step (1), the chemical composition is as follows, in percentage by mass: carbon 0.75%, silicon 0.25%, nitrogen 0.15%, nickel 2.6%, manganese 0.7%, chromium 0.7%, vanadium 0.09%, molybdenum 0.06%, niobium 0.02%, phosphorus 0.03%, cerium 0.01%, boron 0.003%, sulfur 0.001%, and the balance is iron and unavoidable impurities.

[0102] In step (1), the smelting temperature is 1580°C.

[0103] In step (1), the process conditions for blowing argon are: argon gas flow rate 33 L / min, and processing time 55 minutes.

[0104] In step (1), the diameter of the cylindrical steel billet is 105 mm and the length is 4 m.

[0105] In step (1), the specific method of surface nano-treatment is: using a friction head to perform circular reciprocating motion on the surface of the steel billet at 12 r / min for 210 minutes, and heat treating it at 530°C and a vacuum degree of 0.04 Pa for 280 minutes; wherein the distance between the friction head and the surface of the steel billet is less than 15 μm.

[0106] In step (1), the specific method of yttrium infiltration treatment is: first, lithium yttrium fluoride, lithium fluoride, and yttrium oxide are uniformly mixed in a molar ratio of 89.55:9.95:0.5, and treated at 640°C and a vacuum degree of 150Pa for 2 hours to obtain a premixed melt; then, under an argon atmosphere, the pretreated steel billet is placed in the premixed melt, the pretreated steel billet is used as a cathode, and graphite is used as an anode to perform electro-reduction yttrium infiltration, the steel billet is taken out, and naturally cooled to room temperature under an argon atmosphere, washed with water, and dried.

[0107] The pretreated steel billet is prepared by the following method: placing the steel billet after surface nano-processing in an atmosphere furnace and treating it under the conditions of nitrogen-oxygen mixed gas at 1 atm and temperature of 510°C for 45 minutes; wherein the molar ratio of nitrogen to oxygen in the nitrogen-oxygen mixed gas is 1:8.5.

[0108] The process conditions for electro-reduction yttrium infiltration are: temperature 610℃, voltage 4.5V, current density 0.4A / cm 2 , time 1.5 hours.

[0109] In step (1), the process conditions for the controlled rolling and controlled cooling treatment of the high-speed wire are: rough rolling at 1150°C, finishing rolling at 910°C, finishing rolling at 1100°C, water cooling, wire drawing at 920°C, air cooling at 750°C on the air cooling line, and the cooling rate is controlled at 18°C / s.

[0110] In step (2), the wire is ultrasonically cleaned using a potassium sulfate-sodium oxalate mixed aqueous solution, and the specific process conditions are: temperature 75°C, ultrasonic power 400W, and treatment time 25 minutes; wherein the mass concentrations of potassium sulfate and sodium oxalate contained in the mixed aqueous solution are 10% and 5%, respectively.

[0111] In step (2), the process conditions for solution treatment are: argon flow rate 3m 3 / h, temperature 1040℃, solution time 35s; water cooling achieves rapid cooling.

[0112] In step (2), the thick steel wire is obtained by drawing the steel wire through 7 passes at a speed of 300 m / min.

[0113] In step (3), the polytungstic acid sol is prepared by the following method: adding tungsten powder to a 30% by mass concentration hydrogen peroxide solution, continuously stirring until the tungsten powder is completely dissolved, centrifuging to obtain the supernatant, adding anhydrous ethanol, stirring and mixing, and distilling under reduced pressure; wherein the mass ratio of tungsten powder, hydrogen peroxide solution, and anhydrous ethanol is 1:11:85, and the process conditions of the reduced pressure distillation are: temperature 52°C, pressure 25Pa, and time 22 minutes.

[0114] In step (3), the process conditions of vacuum heat treatment are: treatment at 1150° C. and vacuum degree 15 Pa for 3 hours.

[0115] In step (4), the fine steel wire is obtained by drawing the wire through 14 passes at a speed of 110 m / min.

[0116] In step (5), the specific method of boronizing treatment is: completely immerse the thin steel wire in the boronizing solution, with the thin steel wire as the cathode and the graphite as the anode, pressurize to 260V at room temperature, and take it out after treating for 2 minutes.

[0117] The boronizing solution is prepared by mixing the following components: 0.28 kg of sodium fluoroborate, 0.11 kg of potassium hydroxide, 0.055 kg of potassium chloride, 0.11 kg of nickel sulfate, 0.09 kg of titanium sulfate, 0.21 kg of citric acid, and adding deionized water to 10 kg.

[0118] In step (5), the steel wire rope is twisted into a 6×7+IWS structure.

[0119] Comparative Example

[0120] A method for preparing a steel wire rope, comprising the following specific steps:

[0121] (1) First, according to the chemical composition of the formula, smelting, argon blowing, and casting are performed to obtain cylindrical steel billets, surface nano-treatment, yttrium infiltration treatment, high-speed wire controlled rolling and controlled cooling treatment, and wire rods with a diameter of 6 mm are obtained;

[0122] (2) The wire is then ultrasonically cleaned, solution treated, and drawn to obtain a thick steel wire with a diameter of 2 mm;

[0123] (3) subjecting the thick steel wire to vacuum heat treatment to obtain pretreated thick steel wire;

[0124] (4) The pretreated thick steel wire is further drawn to obtain a thin steel wire with a diameter of 0.2 mm;

[0125] (5) Finally, the fine steel wire is subjected to boronizing treatment and twisted into a steel wire rope.

[0126] Wherein, in step (1), the chemical composition is as follows, in percentage by mass: carbon 0.7%, silicon 0.2%, nitrogen 0.1%, nickel 2.5%, manganese 0.6%, chromium 0.6%, vanadium 0.08%, molybdenum 0.05%, niobium 0.02%, phosphorus 0.03%, cerium 0.01%, boron 0.002%, sulfur 0.001%, and the balance is iron and unavoidable impurities.

[0127] In step (1), the smelting temperature is 1550°C.

[0128] In step (1), the process conditions for blowing argon are: argon gas flow rate 30 L / min, and processing time 50 minutes.

[0129] In step (1), the diameter of the cylindrical steel billet is 100 mm and the length is 4 m.

[0130] In step (1), the specific method of surface nano-treatment is: using a friction head to perform circular reciprocating motion on the surface of the steel billet at 10 r / min for 200 minutes, and heat treating it at 500°C and a vacuum degree of 0.03 Pa for 250 minutes; wherein the distance between the friction head and the surface of the steel billet is less than 15 μm.

[0131] In step (1), the specific method of yttrium infiltration treatment is: first, lithium yttrium fluoride, lithium fluoride, and yttrium oxide are uniformly mixed in a molar ratio of 89.55:9.95:0.5, and treated at 630°C and a vacuum degree of 100Pa for 2 hours to obtain a premixed melt; then, under an argon atmosphere, the pretreated steel billet is placed in the premixed melt, the pretreated steel billet is used as a cathode, and graphite is used as an anode to perform electro-reduction yttrium infiltration, the steel billet is taken out, and naturally cooled to room temperature under an argon atmosphere, washed with water, and dried.

[0132] The pretreated steel billet is prepared by the following method: placing the steel billet after surface nano-processing in an atmosphere furnace and treating it under the conditions of nitrogen-oxygen mixed gas of 1 atm and temperature of 500°C for 40 minutes; wherein the molar ratio of nitrogen to oxygen in the nitrogen-oxygen mixed gas is 1:8.

[0133] The process conditions for electro-reduction yttrium infiltration are: temperature 600℃, voltage 4.3V, current density 0.3A / cm 2 , time 1 hour.

[0134] In step (1), the process conditions for the controlled rolling and controlled cooling treatment of the high-speed wire rod are: rough rolling at 1100°C, finishing rolling at 900°C, finishing rolling at 1000°C, water cooling, wire drawing at 900°C, air cooling at 700°C on the air cooling line, and the cooling rate is controlled at 15°C / s.

[0135] In step (2), the wire is ultrasonically cleaned using a potassium sulfate-sodium oxalate mixed aqueous solution, and the specific process conditions are: temperature 70°C, ultrasonic power 300W, and treatment time 20 minutes; wherein the mass concentrations of potassium sulfate and sodium oxalate contained in the mixed aqueous solution are 10% and 5%, respectively.

[0136] In step (2), the process conditions for solution treatment are: argon flow rate 2m 3 / h, temperature 1030℃, solution time 30s; water cooling for rapid cooling.

[0137] In step (2), the thick steel wire is obtained by drawing the steel wire through 7 passes at a speed of 200 m / min.

[0138] In step (3), the process conditions of vacuum heat treatment are: treatment at 1100° C. and vacuum degree 10 Pa for 2 hours.

[0139] In step (4), the fine steel wire is obtained by drawing the steel wire through 14 passes at a speed of 100 m / min.

[0140] In step (5), the specific method of boronizing treatment is: completely immerse the thin steel wire in the boronizing solution, with the thin steel wire as the cathode and the graphite as the anode, pressurize to 220V at room temperature, and take it out after treating for 2 minutes.

[0141] The boronizing solution is prepared by mixing the following components: 0.25 kg of sodium fluoroborate, 0.1 kg of potassium hydroxide, 0.05 kg of potassium chloride, 0.1 kg of nickel sulfate, 0.08 kg of titanium sulfate, 0.2 kg of citric acid, and adding deionized water to 10 kg.

[0142] In step (5), the steel wire rope is twisted into a 6×7+IWS structure.

[0143] Test example

[0144] The breaking tensile forces of the steel wire ropes obtained in Examples 1 to 3 and the comparative example were tested using a tensile testing machine.

[0145] The steel wire ropes obtained in Examples 1 to 3 and the comparative example were placed in an environment of hydrochloric acid mist with a mass concentration of 10% at a temperature of 25° C., left to stand, and the time for rust to appear was observed under a microscope.

[0146] The test results are shown in Table 1.

[0147] Table 1. Wire rope strength and corrosion resistance test results

[0148] Breaking force (kN) Time to pitting rust (h) Example 1 5.58 582 Example 2 5.64 589 Example 3 5.71 598 Comparative Example 4.84 501

[0149] As shown in Table 1, the steel wire ropes obtained in Examples 1 to 3 have a large breaking tensile force, and the time for pitting rust to appear in a hydrochloric acid mist environment is more than 580 hours, indicating that the steel wire ropes have good strength and corrosion resistance.

[0150] In the comparative example, the polymer acid sol treatment step was omitted, and the strength and corrosion resistance were significantly deteriorated, indicating that the surface nano-treatment, yttrium infiltration treatment, polymer tungsten acid sol treatment, and boron infiltration treatment had a synergistic effect, which improved the microstructure of the product and provided more sufficient protection for the surface of the fine steel wire, ensuring that the product had higher strength and corrosion resistance.

[0151] While the present invention is illustrated by the aforementioned embodiments, the present invention is not limited to these embodiments, nor does it necessarily rely on these embodiments for implementation. Those skilled in the art will appreciate that any improvements to the present invention, equivalent replacements for individual raw materials in the present invention, additions of auxiliary ingredients, and selection of specific methods, etc., fall within the scope of protection and disclosure of the present invention.

Claims

1. A method for preparing a corrosion-resistant steel wire rope, characterized in that: The specific steps are as follows: (1) First, according to the chemical composition of the formula, smelting, argon blowing, and casting are performed to obtain cylindrical steel billets, surface nano-treatment, yttrium infiltration treatment, high-speed wire controlled rolling and controlled cooling treatment, and wires with a diameter of 6 to 8 mm are obtained; (2) The wire is then ultrasonically cleaned, solution treated, and drawn to obtain a thick steel wire with a diameter of 2 to 3 mm; (3) completely immersing the thick steel wire in the polytungstic acid sol, quickly taking it out, and vacuum heat treating it to obtain the pretreated thick steel wire; (4) The pretreated thick steel wire is further drawn to obtain a thin steel wire with a diameter of 0.2 to 0.3 mm; (5) Finally, the fine steel wire is subjected to boronizing treatment and twisted into a steel wire rope; Wherein, in step (1), the specific method of surface nano-treatment is: using a friction head to perform circular reciprocating motion on the surface of the steel billet at 10-15 r / min for 200-220 minutes, and heat treating at 500-550°C and a vacuum degree of 0.03-0.05 Pa for 250-300 minutes; wherein, the distance between the friction head and the surface of the steel billet is less than 15 μm; Wherein, in step (1), the specific method of yttrium infiltration treatment is: first, lithium yttrium fluoride, lithium fluoride, and yttrium oxide are uniformly mixed according to a molar ratio of 89.55:9.95:0.5, and treated at 630-650°C and a vacuum degree of 100-200 Pa for 2-3 hours to obtain a premixed melt; then, under an argon atmosphere, the pretreated steel billet is placed in the premixed melt, the pretreated steel billet is used as a cathode, and graphite is used as an anode to perform electro-reduction yttrium infiltration, the steel billet is taken out, and naturally cooled to room temperature under an argon atmosphere, washed with water, and dried; Among them, in step (5), the specific method of boronizing treatment is: completely immerse the thin steel wire in the boronizing solution, with the thin steel wire as the cathode and the graphite as the anode, pressurize to 220-300V at room temperature, and take it out after treating for 2-3 minutes.

2. The preparation method according to claim 1, characterized in that In step (1), the chemical composition is as follows, in percentage by mass: 0.7-0.8% carbon, 0.2-0.3% silicon, 0.1-0.2% nitrogen, 2.5-2.7% nickel, 0.6-0.8% manganese, 0.6-0.8% chromium, 0.08-0.1% vanadium, 0.05-0.07% molybdenum, 0.02-0.03% niobium, 0.03-0.04% phosphorus, 0.01-0.02% cerium, 0.002-0.003% boron, 0.001-0.002% sulfur, and the balance is iron and unavoidable impurities.

3. The preparation method according to claim 1, characterized in that In step (1), the smelting temperature is 1550-1600°C; the process conditions of argon blowing are: argon gas flow rate 30-35 L / min, processing time 50-60 minutes; the diameter of the cylindrical steel billet is 100-110 mm, and the length is 4-5 m.

4. The preparation method according to claim 1, characterized in that In step (1), the process conditions for the controlled rolling and controlled cooling treatment of the high-speed wire rod are: rough rolling at 1100-1200°C, finishing rolling at 900-920°C, finishing rolling at 1000-1100°C, water cooling, wire laying at 900-950°C, air cooling at 700-800°C on the air cooling line, and the cooling rate is controlled at 15-20°C / s.

5. The preparation method according to claim 1, characterized in that In step (2), the wire is ultrasonically cleaned using a potassium sulfate-sodium oxalate mixed aqueous solution, and the specific process conditions are: temperature 70-80° C., ultrasonic power 300-400 W, and treatment time 20-30 minutes; wherein the mass concentrations of potassium sulfate and sodium oxalate contained in the mixed aqueous solution are 10% and 5%, respectively; The process conditions of solution treatment are: argon flow rate 2-3m3 / h, temperature 1030-1050℃, solution time 30-40s; Water cooling is used to achieve rapid cooling; thick steel wire is obtained through 7 drawing passes at a speed of 200-300m / min.

6. The preparation method according to claim 1, characterized in that In step (3), the polytungstic acid sol is prepared by the following method: adding tungsten powder to a 30% by mass concentration hydrogen peroxide solution, continuously stirring until the tungsten powder is completely dissolved, centrifuging to obtain the supernatant, adding anhydrous ethanol, stirring and mixing, and heating and distilling under reduced pressure to obtain the sol; wherein the mass ratio of tungsten powder, hydrogen peroxide solution, and anhydrous ethanol is 1:10-12:80-90, and the process conditions of the reduced pressure distillation are: temperature 50-55°C, pressure 20-30Pa, and time 20-25 minutes; The process conditions of vacuum heat treatment are: treatment at 1100-1200° C. and vacuum degree 10-20 Pa for 2-3 hours.

7. A corrosion-resistant steel wire rope, characterized in that: The invention is obtained by the preparation method according to any one of claims 1 to 6.