Preparation method of non-magnetic stainless steel wire rope

Abstract

The invention relates to a preparation method of a non-magnetic stainless steel wire rope. The preparation method comprises the following steps: S1, temperature-controlled drawing: performing temperature-controlled drawing on a 304 stainless steel bus to obtain a stainless steel wire; s2, stranding: the stainless steel wires are twisted into stainless steel wire strands; s3, rope combining, wherein the stainless steel wire strands are rolled through a burr type pre-deformation tool, so that the stainless steel wire strands form spiral stainless steel strands; s4, mechanical stress relief treatment, wherein the stainless steel strands are repeatedly bent and straightened through compression rollers of two sets of deformers, so that residual stress of the strands is distributed again; s5, low-temperature stress relief treatment; S4, the steel wire rope subjected to mechanical stress relief treatment in the step S4 is subjected to low-temperature stress relief treatment at the temperature of 300-450 DEG C; s6, cleaning: ultrasonic alkali cleaning; s7, washing with hot water: rinsing with hot water; and S8, drying, wherein the non-magnetic stainless steel wire rope is obtained after drying. The preparation method of the non-magnetic stainless steel wire rope is simple to operate, and the prepared stainless steel wire rope is non-magnetic and is suitable for the fields of medical industry and precision machinery.

Description

Technical Field

[0001] The invention belongs to the technical field of metal product processing, and particularly relates to a method for preparing a non-magnetic stainless steel wire rope. Background Art

[0002] The use of stainless steel wire ropes in different fields is increasing, and the requirements for their quality and performance are also getting higher and higher. For the medical industry and precision machinery field, the wire ropes are not only required to have good appearance and mechanical properties, but also to be non-magnetic.

[0003] Chinese patent CN107675534A discloses a production process of stainless steel wire rope, which uses stainless steel as the raw material for wire rope production, and specifically includes the following process steps: step 1, surface treatment; step 2, drawing; step 3, normalizing heat treatment, galvanizing; step 4, drawing; step 5, twisting into rope. Although the prepared stainless steel wire rope has good corrosion resistance, it is a high-carbon steel wire rope with strong magnetism and is not suitable for the medical industry and precision machinery field.

[0004] Chinese patent CN202211443792.0 discloses a method for preparing a high-cleanliness medical steel wire rope, comprising the following steps: selecting a 304 stainless steel busbar with a busbar diameter of 0.8-1.0mm. Solution treatment, passing the 304 stainless steel busbar through an annealing furnace for solution treatment; using a wet drawing process, drawing the 304 stainless steel busbar 16-18 times to draw it into stainless steel wire; twisting the stainless steel wire into a stainless steel wire rope through a stranding machine; burning and degreasing; cleaning and making a wire rope that meets medical industry standards. This patent is mainly for medical stainless steel wire ropes, and its main function is to reduce the residual lubricant on the surface to improve the corrosion resistance of the product in the boiling water test. The steel wire rope has a strong magnetism and is not suitable for the field of precision machinery.

[0005] Chinese patent CN201911372185.8 discloses a production process for corrosion-resistant stainless steel wire rope for woven mesh, including the following steps: selecting 316 stainless steel busbar; annealing, annealing the 316 stainless steel busbar through an annealing furnace; surface treatment; using a wet drawing process to draw the 316 stainless steel busbar 14 times to draw it into stainless steel wire; twisting the stainless steel wire into a stainless steel wire rope through a stranding machine. This patent mainly improves the corrosion resistance from the aspects of raw materials, front-end cold processing, and heat treatment production processes. The stainless steel wire rope still has a certain weak magnetism and is not suitable for the field of precision machinery.

[0006] Therefore, there is an urgent need for a method for preparing a stainless steel wire rope, wherein the prepared stainless steel wire rope not only has good appearance and mechanical properties, but is also non-magnetic and can be applied to the field of precision machinery. Summary of the invention

[0007] The purpose of the present invention is to provide a method for preparing a non-magnetic stainless steel wire rope, which is simple to operate. The prepared stainless steel wire rope has no magnetism and can be used in the medical industry, precision machinery parts, etc.

[0008] The technical solution adopted by the present invention to solve the above problem is: a method for preparing a non-magnetic stainless steel wire rope, comprising the following steps: S1 temperature-controlled drawing: 304 stainless steel busbar is selected as raw material, which includes the following components by mass percentage: C < 0.12%, Cr 17.00-20.00%, Ni 4.0-8.5%, Mn > 0.5%, Si 0.3-0.5%, P < 0.032%, S < 0.0030%, Cu < 0.5%, N < 0.5%, the balance is Fe and inevitable impurities, and the 304 stainless steel busbar is temperature-controlled drawn by a water tank wire drawing equipment to obtain stainless steel wire; S2 stranding: The stainless steel wire drawn in S1 is twisted into stainless steel wire strands by a stranding machine; S3 rope closing: The stainless steel wire strands in S2 are rolled by a bristle pre-deformation tooling through a rope closing machine to form a spiral stainless steel strand; S4 Mechanical stress relief treatment: In S3, the steel wire rope is repeatedly bent and straightened by two sets of rollers of the deformer to redistribute the residual stress of the strands; S5 low temperature stress relief treatment: The steel wire rope after mechanical stress relief treatment in S4 is subjected to low temperature stress relief treatment at 300-450℃ to further eliminate the residual stress and magnetic phase of the steel wire rope; S6 cleaning: The stainless steel wire rope in S5 is subjected to ultrasonic alkaline cleaning; S7 hot water washing: The stainless steel wire rope is rinsed in 70~85℃ hot water; S8 Drying: In step S7, the stainless steel wire rope is washed with hot water and then dried to obtain a non-magnetic stainless steel wire rope.

[0009] Preferably, lubricating liquid is used in the drawing process of step S1, and the temperature of the lubricating liquid is 40-90° C.; the diameter of the 304 stainless steel busbar is 0.4-0.8 mm, and the strength is 700-900 MPa.

[0010] More preferably, when the temperature of the lubricating liquid is 40-60°C, the pulling speed is 250+ / -10m / min; when the temperature of the lubricating liquid is 60-90°C, the pulling speed is 320+ / -10m / min.

[0011] More preferably, the lubricating liquid comprises the following components in percentage by mass: 18-20% of Jinan Yinuo WD 6688 wire drawing agent, 8-12% of Jinan Yinuo WD 500 wire drawing agent, 9-10% of Condat 4036 wire drawing lubricant, and the rest is water.

[0012] Preferably, in the water tank wire drawing described in step S1, the first drawing amount is between 15% and 18%, the last drawing amount is between 10% and 12%, the surface reduction rate of the intermediate passes is the same, and the drawing amount of each pass is between 12% and 13.5%.

[0013] Preferably, the bristle-type pre-deformation tooling in step S3 is a bristle-type 6-equally divided pre-deformation tooling, which is composed of three dividing disks with a sheet diameter of 4+ / -0.5mm, each dividing disk has 6 rollers, and each dividing disk can rotate freely and is fixed with screws.

[0014] More preferably, the diameter of the inner circular dividing disk of the barbed 6-part pre-deformation is 40+ / -4mm, the diameter of the outer circular dividing disk is 45+ / -4mm, the angle between the side of the dividing disk and the center line is 20+ / -5°, the diameter of the barbed roller is 3.4+ / -0.2mm, the width of the roller groove is 1.2+0.2mm, and the depth of the groove is 0.6+0.2mm.

[0015] Preferably, the amount of stainless steel strand pressed by the tool roller in step S3 is = (3-5) × wire rope diameter - roller diameter.

[0016] Preferably, in step S4, the two groups of deformers are adjacently and vertically placed to further reduce and eliminate the residual stress of the yarn rope, making the structure of the yarn rope more compact and straight. The diameter of the horizontal pulley in deformer 1 is 15±2mm, the spacing between adjacent pulleys is 15±2mm, and the number of pulleys is 15+16; the diameter of the horizontal pulley in deformer 2 is 15±2mm, the spacing between adjacent pulleys is 15±2mm, and the number of pulleys is 15+16.

[0017] Preferably, in step S4, the wire rope is subjected to stress elimination by two groups of deformers, wherein the pressure amount of the 5 middle rollers of each group of deformers = (2-3) × the diameter of the wire rope, the pressure amount of the 5 rollers before the wire rope enters the deformer = (1-2) × the diameter of the wire rope, and the pressure amount of the last 5 rollers before the wire rope exits the deformer = (0.5-1.5) × the diameter of the wire rope.

[0018] Preferably, the protective atmosphere for the low-temperature stress relief treatment in step S5 is nitrogen and hydrogen decomposed from ammonia, and the stainless steel wire rope subjected to the low-temperature stress relief treatment is cooled by air.

[0019] Preferably, the alkaline solution in step S6 is 20.0±2% by mass of alkaline cleaning agent WC-180FZ (manufacturer: Jinan Yinuo Lubricant Manufacturing Co., Ltd.) and 1.0±0.2% by mass of organic emulsified silicon, and the rest is water and unavoidable impurities; the temperature of the alkaline solution is 80±5°C.

[0020] Preferably, step S8 is specifically as follows: after the stainless steel wire rope is washed with hot water in step S7, the wire rope temperature is 30-60°C, and the wire rope is dried in an oven at 160.0+ / -10°C.

[0021] More preferably, in step S8, the oven uses circulating hot air, and the hot air is blown from the oven outlet through the lower pipe to the oven inlet by a blower, forming a hot air circulation inside the oven.

[0022] Compared with the prior art, the advantages of the present invention are: In the preparation method of the non-magnetic stainless steel wire rope of the present invention, 304 stainless steel busbar is selected as the raw material, and its components and their mass percentages are limited, thereby reducing the magnetic phase in the masterbatch. In addition, in the process of temperature-controlled drawing of the 304 stainless steel busbar through a water tank wire drawing device to obtain a stainless steel wire, temperature-controlled drawing and appropriate deformation amount can effectively reduce the generation of the magnetic phase of the stainless steel wire.

[0023] In the production and preparation method of the non-magnetic stainless steel wire rope of the present invention, a 304 stainless steel busbar is drawn by a water tank wire drawing device under temperature control to obtain a stainless steel wire, and a new formula of lubrication mixed with an aqueous and oily lubricant is used. Under the condition of ensuring lubrication, the oily lubricant floats on the surface to form a thermal insulation layer, so that the temperature of the lubricant is maintained within the required temperature range. At the same time, the new formula of the aqueous and oily lubricant can improve the production efficiency of the stainless steel wire and can make the wire rope product have a better appearance.

[0024] The method of first subjecting the non-magnetic stainless steel wire rope to mechanical stress relief treatment and then subjecting the non-magnetic stainless steel wire rope to low-temperature stress relief treatment in the production and preparation method of the present invention not only makes the straightness and flatness of the steel wire rope meet the requirements of GB / T 9944-2015, but also does not need to be subjected to a higher heat treatment temperature to eliminate the magnetic phase, thereby avoiding the defect that the actual measured breaking tension of the steel wire rope will be greatly reduced when the magnetic phase is eliminated at an excessively high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a front view of a 6-partition pre-deformation tool with a bristle pattern used in the method for preparing a non-magnetic stainless steel wire rope of the present invention.

[0026] Figure 2 It is a right view of the 6-partition pre-deformation tool with bristles used in the preparation method of the non-magnetic stainless steel wire rope of the present invention.

[0027] Among them: 1 is a pressure roller; 2 is an outer circular distribution disk; 3 is a middle circular distribution disk; 4 is an inner circular distribution disk; 5, 6, 7, 8, 9, 10 are all pressure rollers. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1 , 2 As shown, there is a front view of a barbed-type 6-equally divided pre-deformation tool used in the method for preparing the non-magnetic stainless steel wire rope in Example 1, and a right view of a barbed-type 6-equally divided pre-deformation tool used in the method for preparing the non-magnetic stainless steel wire rope in Example 2. Example 1

[0030] A method for preparing a non-magnetic stainless steel wire rope comprises the following steps: S1 temperature controlled drawing: The mass percentage of the stainless steel busbar with a diameter of 0.6mm and a strength of 780Mpa is as follows: C=0.09%, Cr=18.0%, Ni=5.6%, Mn=9.8%, Si=0.5%, P=0.024%, S=0.0001%, Cu=0.20%, N=0.3%, and the remainder is Fe and inevitable impurities; the stainless steel wire is obtained by temperature controlled drawing of the water tank wire drawing equipment; wherein, when the temperature of the water tank wire drawing lubricant is 65°C, the drawing speed is 330m / min, and the stainless steel wire is divided into surface strand center wire 0.15mm, surface strand surface wire 0.13mm, center strand center wire 0.15mm, center strand surface wire 0.15mm, and water tank wire drawing equipment The lubricant is used in the drawing process, and the lubricant includes 19% Jinan Yinuo WD 6688 wire drawing agent, 10% Jinan Yinuo WD 500 wire drawing agent, 10% Condat 4036 wire drawing lubricant, and the rest is water.

[0031] When drawing the water tank wire, the first drawing amount is 18%, the last drawing amount is 12%, the intermediate drawing rates are the same and the drawing amount of each drawing is 13.5%.

[0032] S2 stranding: The stainless steel wire drawn in S1 is twisted into stainless steel wire strands by a stranding machine. When stranding, a dividing disc is used to evenly divide the surface wire of the stainless steel wire into six equal parts.

[0033] S3 rope closing: The stainless steel wire strands in S2 are rolled by the rope closing machine through the barbed 6-division pre-deformation tooling to form spiral stainless steel strands, which are evenly divided into 6 equal parts and enter the die. The barbed 6-division pre-deformation consists of three wire dividing disks with a sheet diameter of 4mm, each of which has 6 rollers. Each wire dividing disk can rotate freely and can be fixed with screws. The diameter of the inner circular wire dividing disk of the barbed 6-division pre-deformation is 40mm, the diameter of the outer circular wire dividing disk is 45mm, and the angle between the side of the wire dividing disk and the center line is 20°. The diameter of the barbed roller is 3.4mm, the width of the roller groove is 1.2mm, the depth of the groove is 0.6mm, and the amount of stainless steel strand pressed by rolling is = 4×wire rope diameter-roller diameter=1.4.

[0034] S4 mechanical stress relief treatment: The steel wire rope in S3 is repeatedly bent and straightened by the pressure rollers of two sets of deformers to redistribute the residual stress of the strands. The two sets of deformers are adjacent and placed vertically. The horizontal pulley diameter of the first deformer is 15mm, the distance between adjacent pulleys is 15mm, and the number of pulleys is 15+16; the horizontal pulley diameter of the second deformer is 15mm, the distance between adjacent pulleys is 15mm, and the number of pulleys is 15+16.

[0035] The wire rope is stress-relieved by two sets of deformers, where the pressure of the 5 middle rollers of each set of deformers = 2.5 × wire rope diameter = 3 mm, the pressure of the 5 rollers before the wire rope enters the deformer = 1.5 × wire rope diameter = 1.8 mm, and the pressure of the last 5 rollers before the wire rope exits the deformer = 0.9 × wire rope diameter = 1.08 mm.

[0036] S5 low temperature stress relief treatment: The steel wire rope after mechanical stress relief treatment in S4 can be further relieved of residual stress and magnetic phase by low temperature stress relief treatment at 380℃. The protective atmosphere is nitrogen and hydrogen decomposed from ammonia, and the stainless steel wire rope after low temperature stress relief treatment is air cooled.

[0037] S6 cleaning: The stainless steel wire rope in S5 is cleaned by ultrasonic alkali, and the alkaline solution is 20.0% by mass of alkaline cleaning agent WC-180FZ (manufacturer: Jinan Yinuo Lubricant Manufacturing Co., Ltd.) and 1.0% by mass of organic emulsified silicon, and the rest is water and unavoidable impurities. The alkaline solution is controlled at 80℃.

[0038] S7 hot water washing: The stainless steel wire rope is rinsed with 85℃ hot water to preheat the wire rope.

[0039] S8 Drying: After the stainless steel wire rope is washed with hot water in step S7, the wire rope temperature is 48°C, and the wire rope is dried in an oven at 160°C. Circulating hot air is used, and the hot air is blown from the oven outlet through the lower pipe to the oven inlet by a blower, and hot air circulation is formed inside the oven. Example 2

[0040] S1 temperature controlled drawing: The mass percentage of the stainless steel busbar with a diameter of 0.8mm and a strength of 780Mpa is as follows: C=0.09%, Cr=18.0%, Ni=5.6%, Mn=9.8%, Si=0.5%, P=0.024%, S=0.0001%, Cu=0.20%, N=0.3%, and the remainder is Fe and inevitable impurities; the stainless steel wire is obtained by temperature controlled drawing of the water tank wire drawing equipment; wherein, when the temperature of the water tank wire drawing lubricant is 65°C, the drawing speed is 330m / min, and the stainless steel wire is divided into surface strand center wire 0.15mm, surface strand surface wire 0.13mm, center strand center wire 0.15mm, center strand surface wire 0.15mm, and water tank wire drawing equipment The lubricant is used in the drawing process, and the lubricant includes 19% Jinan Yinuo WD 6688 wire drawing agent, 10% Jinan Yinuo WD 500 wire drawing agent, 10% Condat 4036 wire drawing lubricant, and the rest is water. When drawing the water tank wire, the first drawing amount is 18%, the last drawing amount is 12%, the middle drawing amount is the same, and the drawing amount of each drawing is 13.5%. The rest is the same as Example 1.

[0041] Comparative Example 1 The only difference from Example 1 is that in the temperature-controlled drawing step S1, the stainless steel busbar includes the following components in mass percentage: C = 0.064%, Cr = 17.62%, Ni = 12.05%, Mn = 0.73%, Si = 0.44%, P = 0.034%, S = 0.002%, Cu = 0.16%, N = 0.025%, Mo = 2.02%, and the balance is Fe and unavoidable impurities.

[0042] Comparative Example 2 S3 rope closing: The stainless steel wire strands in S2 are rolled by a rope closing machine through a 6-division pre-deformation tooling to form a spiral stainless steel strand, which is evenly divided into 6 equal parts and enters the die. The 6-division pre-deformation of the thorny type consists of three wire dividing disks with a sheet diameter of 8+ / -0.5mm, each of which is composed of 6 rollers. Each wire dividing disk can rotate freely and can be fixed with screws. The diameter of the inner circular wire dividing disk of the 6-division pre-deformation of the thorny type is 65+ / -4mm, the diameter of the outer circular wire dividing disk is 75+ / -4mm, and the angle between the side of the wire dividing disk and the center line is 30+ / -5°. The diameter of the thorny roller is 5.4+ / -0.2mm, the width of the roller groove is 1.4+0.2mm, and the depth of the groove is 0.8+0.2mm. The amount of stainless steel strand pressed by rolling is = (0.6~0.8) × wire rope diameter-roller diameter. The rest is the same as Example 1.

[0043] Comparative Example 3 S4 Mechanical stress relief treatment: The steel wire rope in S3 is repeatedly bent and straightened by a set of rollers of a deformer to redistribute the residual stress of the strand. The diameter of the horizontal pulley in the deformer is 15±2mm, the spacing between adjacent pulleys is 15±2mm, and the number of pulleys is 15+16. The rest is the same as in Example 1.

[0044] Comparative Example 4 S5 Stress relief treatment: The steel wire rope after mechanical stress relief treatment in S4 is subjected to low temperature stress relief treatment at 700°C to further eliminate the residual stress and magnetic phase of the steel wire rope. The protective atmosphere is nitrogen and hydrogen decomposed from ammonia, and the stainless steel wire rope after low temperature stress relief treatment is cooled by air. The rest is the same as in Example 1.

[0045] Comparative Example 5 S5 Stress relief treatment: The steel wire rope after mechanical stress relief treatment in S4 is subjected to low temperature stress relief treatment at 1000°C to further eliminate the residual stress and magnetic phase of the steel wire rope. The protective atmosphere is nitrogen and hydrogen decomposed from ammonia, and the stainless steel wire rope after low temperature stress relief treatment is cooled by air. The rest is the same as in Example 1.

[0046] Comparative Example 6 A stainless steel busbar with a diameter of 1.0 mm was used. The rest was the same as in Example 1.

[0047] Comparative Example 7 When drawing the water tank wire, the first drawing amount is 18%, the last drawing amount is 13%, the surface reduction rate of the intermediate passes is the same, and the drawing amount of each pass is 15.5%. The rest is the same as in Example 1.

[0048] Comparative Example 8 In the step S1 of temperature-controlled drawing, the lubricating fluid used in the drawing process of the water tank wire drawing equipment is Condat 4036 wire drawing lubricating oil. The rest is the same as in Example 1.

[0049] Comparative Example 9 S5 Low temperature stress relief treatment: The steel wire rope after mechanical stress relief treatment in S4 is not subjected to low temperature stress relief treatment. The rest is the same as in Example 1.

[0050] Table 1

[0051] Note: The magnetic testing equipment is the JDZ-2 magnetic permeability measuring instrument produced by Baoji Jingli Automation Machinery Co., Ltd.

[0052] From Table 1 we can see that: It can be seen from Examples 1 and 2 that the present invention provides a method for producing a non-magnetic stainless steel wire rope. By adopting this technical solution, a relatively non-magnetic stainless steel wire rope (6×7-WSC-1.2mm) can be obtained.

[0053] By comparing Example 1 and Comparative Example 1, it can be seen that the components of the masterbatch play a key role in the magnetic properties of the steel wire rope, which shows that the present invention further limits the components of the masterbatch to make the steel wire rope product have lower magnetism.

[0054] By comparing Example 1 and Comparative Example 2, it can be seen that pre-deformation is helpful for the forming of the steel wire rope, which shows that the present invention further limits the size of the pre-deformation tooling, so that the steel wire rope product can have better performance and product quality.

[0055] By comparing Example 1 and Comparative Example 3, it can be seen that the size of the post-deformation tooling is helpful to adjust the residual stress of the wire rope, which shows that the present invention further limits the size of the post-deformation tooling, so that the wire rope product can have better performance and product quality.

[0056] By comparing Example 1 with Comparative Examples 4-5, it can be seen that without using high temperature as a demagnetization method, the steel wire rope will have a higher breaking force while obtaining non-magnetic properties. The heat treatment temperature has an impact on the magnetic phase of the stainless steel wire rope: within the heat treatment temperature range of 500-850°C, the magnetic phase will increase; while within the range of 850-1080°C, the martensite phase in the stainless steel is completely austenitized, the magnetism completely disappears, but the breaking force does not meet the requirements. This shows that the present invention further limits the heat treatment process, which can make the steel wire rope product have a higher breaking force, can make the steel wire rope product have lower magnetism and better product quality.

[0057] By comparing Examples 1-2 and Comparative Example 6, it can be seen that a relatively better non-magnetic effect can be obtained by using a masterbatch with a diameter of 0.4-0.8 mm.

[0058] By comparing Examples 1-2 and Comparative Example 7, it can be seen that excessive cold working deformation of the stainless steel wire will reduce the surface quality of the stainless steel wire and increase its magnetism, especially when the cold working deformation exceeds the drawing limit of the material, the magnetism will increase and the breaking force will also decrease. This shows that the present invention further limits the cold working process of the stainless steel wire, which can make the wire rope product have lower magnetism and better appearance quality.

[0059] Comparative Example 1 and Comparative Example 8, by using a mixed drawing aid (18-20% of Jinan Yinuo WD 6688 wire drawing agent, 8-12% of Jinan Yinuo WD 500 wire drawing agent, 9-10% Condat 4036 wire drawing lubricant, and the rest water), compared with using only Condat 4036 wire drawing lubricant, a non-magnetic stainless steel wire rope can be obtained, and the appearance quality of the wire rope will also be better. This shows that the present invention further limits the ratio of the lubricating aid within a specific range, which can make the wire rope product have a better appearance.

[0060] By comparing Example 1 and Comparative Example 9, it can be seen that the use of low temperature treatment to eliminate stress can enable the steel wire rope to obtain lower residual stress.

[0061] In addition to the above embodiments, the present invention also includes other implementation modes. Any technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing a non-magnetic stainless steel wire rope, characterized in that: The following steps are involved: S1 temperature-controlled drawing: 304 stainless steel busbar is selected as raw material, which includes the following components by mass percentage: C < 0.12%, Cr 17.00-20.00%, Ni 4.0-8.5%, Mn > 0.5%, Si 0.3-0.5%, P < 0.032%, S < 0.0030%, Cu < 0.5%, N < 0.5%, the balance is Fe and inevitable impurities, and the 304 stainless steel busbar is temperature-controlled drawn by a water tank wire drawing equipment to obtain stainless steel wire; S2 stranding: The stainless steel wire drawn in S1 is twisted into stainless steel wire strands by a stranding machine; S3 rope closing: The stainless steel wire strands in S2 are rolled by a bristle pre-deformation tooling through a rope closing machine to form a spiral stainless steel strand; S4 Mechanical stress relief treatment: In S3, the steel wire rope is repeatedly bent and straightened by two sets of rollers of the deformer to redistribute the residual stress of the strands; S5 low temperature stress relief treatment: The steel wire rope after mechanical stress relief treatment in S4 is subjected to low temperature stress relief treatment at 300-450℃ to further eliminate the residual stress and magnetic phase of the steel wire rope; S6 cleaning: The stainless steel wire rope in S5 is subjected to ultrasonic alkaline cleaning; S7 hot water washing: the stainless steel wire rope is rinsed with hot water; S8 Drying: In step S7, the stainless steel wire rope is washed with hot water and then dried to obtain a non-magnetic stainless steel wire rope.

2. The method for preparing a non-magnetic stainless steel wire rope according to claim 1, characterized in that: In step S1, a lubricating liquid is used in the drawing process, and the temperature of the lubricating liquid is 40-90° C. The diameter of the 304 stainless steel busbar is 0.4-0.8 mm, and the strength is 700-900 MPa.

3. The method for preparing the non-magnetic stainless steel wire rope according to claim 2, characterized in that: When the lubricating fluid temperature is 40~60℃, the pulling speed is 250+ / -10m / min; when the lubricating fluid temperature is 60~90℃, the pulling speed is 320+ / -10m / min.

4. The method for preparing a non-magnetic stainless steel wire rope according to claim 2, characterized in that: The lubricating liquid includes the following components in percentage by mass: 18-20% of Jinan Yinuo WD 6688 wire drawing agent, 8-12% of Jinan Yinuo WD 500 wire drawing agent, 9-10% of Condat 4036 wire drawing lubricant, and the rest is water.

5. The method for preparing a non-magnetic stainless steel wire rope according to claim 1, characterized in that: During the water tank wire drawing described in step S1, the first drawing amount is between 15% and 18%, the last drawing amount is between 10% and 12%, the surface reduction rate of the intermediate passes is the same and the drawing amount of each pass is between 12% and 13.5%.

6. The method for preparing a non-magnetic stainless steel wire rope according to claim 1, characterized in that: The bristle-type pre-deformation tooling in step S3 is a bristle-type 6-equally divided pre-deformation tooling, which is composed of three dividing disks with a sheet diameter of 4+ / -0.5mm, each of which is composed of 6 rollers, and each dividing disk can rotate freely and is fixed with screws.

7. The method for preparing a non-magnetic stainless steel wire rope according to claim 6, characterized in that: The diameter of the inner circular dividing disk of the barbed-hair type 6-part pre-deformed structure is 40+ / -4mm, the diameter of the outer circular dividing disk is 45+ / -4mm, the angle between the side of the dividing disk and the center line is 20+ / -5°, the diameter of the barbed-hair type roller is 3.4+ / -0.2mm, the width of the roller groove is 1.2+0.2mm, and the depth of the groove is 0.6+0.2mm.

8. The method for preparing a non-magnetic stainless steel wire rope according to claim 1, characterized in that: In step S4, the two groups of deformers are placed adjacently and vertically to further reduce and eliminate the residual stress of the yarn rope, making the structure of the yarn rope more compact and straight. The diameter of the horizontal pulley in deformer 1 is 15±2mm, the spacing between adjacent pulleys is 15±2mm, and the number of pulleys is 15+16; the diameter of the horizontal pulley in deformer 2 is 15±2mm, the spacing between adjacent pulleys is 15±2mm, and the number of pulleys is 15+16.

9. The method for preparing a non-magnetic stainless steel wire rope according to claim 1, characterized in that: In step S5, the protective atmosphere for low-temperature stress relief treatment is nitrogen and hydrogen decomposed from ammonia, and the stainless steel wire rope after low-temperature stress relief treatment is cooled by air.

10. The method for preparing a non-magnetic stainless steel wire rope according to claim 1, characterized in that: The alkaline solution in step S6 is 20.0±2% by mass of an alkaline cleaning agent and 1.0±0.2% by mass of an organic emulsified silicon, with the remainder being water and unavoidable impurities.

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