High-strength austenitic stainless steel wire for cold heading and method for manufacturing the same

Abstract

The present application relates to the technical field of stainless steel wire production, and particularly discloses a high-strength austenitic stainless steel wire for cold heading, which comprises the following components in percentage by weight: C: 0.06-0.08%, Si: 0.30-0.45%, Mn: 6.25-6.45%, P: 0.036-0.042%, S: 0.0008%, Cr: 18.10-18.20%, Ni: 3.02-3.07%, Cu: 1.57-1.65%, Mo: 0.10-0.15%, and N: 0.20-0.25%. The present application uses QN1803 stainless steel wire as the raw material of the stainless steel wire for cold heading, adopts multi-pass continuous drawing, high-temperature medium-speed heat treatment process, and resin film agent for film treatment, and the produced stainless steel wire has the advantages of bright surface, defect-free appearance, excellent mechanical properties, good corrosion resistance, and large deformation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stainless steel wire production, in particular to a high-strength austenitic stainless steel wire for cold heading and a preparation method thereof. BACKGROUND

[0002] At present, QN1803 stainless steel wire has been widely used in various fields, especially as cold heading stainless steel wire, under the same process conditions, QN1803 stainless steel wire has better cold working forming performance and corrosion resistance. SUMMARY

[0003] In order to solve the technical problems of poor surface quality, poor mechanical properties and easy wire breaking of the high-strength austenitic stainless steel wire for cold heading in the prior art, one embodiment of the present application provides a high-strength austenitic stainless steel wire for cold heading, which comprises the following components:

[0004] C: 0.06-0.08%, Si: 0.30-0.45%, Mn: 6.25-6.45%, P: 0.036-0.042%, S: 0.0008%, Cr: 18.10-18.20%, Ni: 3.02-3.07%, Cu: 1.57-1.65%, Mo: 0.10-0.15%, N: 0.20-0.25%, by weight percentage.

[0005] Another embodiment of the present application provides a preparation method of the high-strength austenitic stainless steel wire for cold heading, which comprises the following steps:

[0006] S1, soaking the QN1803 stainless steel wire coil with a diameter of Φ5.5mm for skin film treatment;

[0007] S2, multi-pass drawing the QN1803 stainless steel wire coil with a diameter of Φ5.5mm after the soaking skin film treatment to draw the stainless steel wire with a diameter of Φ3.0mm;

[0008] S3, removing the skin film agent on the surface of the stainless steel wire with a diameter of Φ3.0mm and cleaning the stainless steel wire with a diameter of Φ3.0mm with pure water;

[0009] S4, performing first annealing treatment on the stainless steel wire with a diameter of Φ3.0mm in an annealing furnace;

[0010] S5, pickling the stainless steel wire with a diameter of Φ3.0mm after the first annealing treatment with sulfuric acid, and cleaning the stainless steel wire with a diameter of Φ3.0mm after the pickling with clean water and pure water;

[0011] S6, performing second annealing treatment on the stainless steel wire with a diameter of Φ3.0mm in an annealing furnace;

[0012] S7, film treatment is performed on the Φ3.0mm diameter stainless steel wire after the second annealing treatment, and the Φ3.0mm diameter stainless steel wire after the film treatment is dried;

[0013] S8, the Φ3.0mm diameter stainless steel wire is drawn in the same direction, and is drawn into a Φ2.8mm or Φ1.2mm diameter stainless steel wire.

[0014] In a preferred embodiment, in step S1, the QN1803 stainless steel wire coil with a diameter of Φ5.5mm is immersed in the film treatment, and the film agent is in powder form and is dissolved in water.

[0015] In a preferred embodiment, in step S2, the pass deformation of the Φ5.5mm QN1803 stainless steel wire coil after the immersion film treatment is as follows:

[0016] 24%-22%-20%-18%-16%-14%-12%-10%, and is drawn into a Φ3.0mm diameter stainless steel wire.

[0017] In a preferred embodiment, in step S3, the ring type powder wiping method is used to wipe off the film agent on the surface of the Φ3.0mm diameter stainless steel wire.

[0018] In a preferred embodiment, in step S4, the annealing furnace for the first annealing treatment of the Φ3.0mm diameter stainless steel wire is divided into 6-8 temperature zones, each temperature zone is 1m long, the temperature is between 1050-1100℃, and ammonia gas is introduced during the annealing process.

[0019] In step S6, the annealing furnace for the second annealing treatment of the Φ3.0mm diameter stainless steel wire is divided into 6-8 temperature zones, each temperature zone is 1m long, the temperature is between 1050-1100℃, and ammonia gas is introduced during the annealing process.

[0020] In a preferred embodiment, in step S5, sulfuric acid is used for pickling the Φ3.0mm diameter stainless steel wire after the first annealing treatment, and the concentration of the sulfuric acid solution is 16-21%.

[0021] In a preferred embodiment, in step S7, the film treatment is performed on the Φ3.0mm diameter stainless steel wire after the second annealing treatment, and the Φ3.0mm diameter stainless steel wire after the film treatment is dried;

[0022] In a preferred embodiment, in step S7, the drying furnace for drying the Φ3.0mm diameter stainless steel wire after the film treatment is 1m long, and the drying temperature is 320-380℃.

[0023] In a preferred embodiment, the pass deformation of the stainless steel wire with a diameter of 3.0 mm is less than 20% in the step S8.

[0024] The technical scheme provided by the embodiment of the present application has at least the following beneficial effects:

[0025] The present application provides a kind of high-strength austenitic stainless steel wire for cold upsetting and its preparation method, QN1803 stainless steel wire is used as the raw material of stainless steel wire for cold upsetting, drawing, pickling, washing, preheating oven drying, annealing heat treatment is carried out in heating zone, multi-section area heating to meet the temperature required by process, film processing is carried out to the steel wire after heat treatment, directly drawing to finished product specification.Using multi-pass continuous drawing process, annealing is carried out through heating furnace tube, ammonia gas is introduced into the furnace tube, ammonia gas is decomposed into hydrogen-nitrogen mixed gas by heating, to prevent oxidation during annealing process, to ensure the surface quality of stainless steel wire product.

[0026] The present application provides a kind of high-strength austenitic stainless steel wire for cold upsetting and its preparation method, using soaking film processing and resin film agent lubrication to carry out film processing on the surface of stainless steel wire, reducing the friction between stainless steel wire and mold during cold plastic deformation, reducing mold loss, ensuring that the surface of stainless steel wire is not scratched, ensuring the surface quality of product, reducing the breakage rate, and improving production efficiency.

[0027] The present application provides a kind of high-strength austenitic stainless steel wire for cold upsetting and its preparation method, using QN1803 stainless steel wire as the raw material of stainless steel wire for cold upsetting, using multi-pass continuous drawing, high-temperature medium-speed heat treatment process, resin film agent for film processing, the produced stainless steel wire has surface brightness, appearance without defect, excellent mechanical property, good corrosion resistance, and can realize large deformation.

[0028] The present application provides a kind of high-strength austenitic stainless steel wire for cold upsetting and its preparation method, using manganese and nitrogen instead of nickel to stabilize austenitic structure, in austenitic stainless steel, nitrogen is mainly used as solid solution strengthening element to improve the strength of austenitic stainless steel, but does not significantly damage the plasticity and toughness of steel; at the same time, nitrogen improves the corrosion resistance of steel, especially the resistance to local corrosion, such as intergranular corrosion, pitting corrosion and crevice corrosion. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiment of the present application will be described clearly and completely below, obviously, the described embodiment is only a part of the embodiment of the present application, not all the embodiments. Based on the embodiment in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0030] The terms "first", "second", "third", "fourth" and the like in the description and in the claims of the present application, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of such terms, if any, are not intended to limit potential additional discussions of embodiments of the application in which the objects so described can be discussed regardless of the manner in which they are discussed, such as out of order and / or reverse order. Furthermore, the terms "comprise", "comprising", "include", "including", and the like, as used herein, are specifically intended to be construed as open-ended terms (i.e., the terms do not exclude additional, unrecited elements), rather than terms of limitation. By using these terms, the disclosure and any claims thereof can also include one or more elements or steps even though these elements or steps are not recited in the claims.

[0031] According to embodiments of the present application, there is provided a high-strength austenitic stainless steel wire for cold heading, comprising the following components:

[0032] C: 0.06-0.08%, Si: 0.30-0.45%, Mn: 6.25-6.45%, P: 0.036-0.042%, S: 0.0008%, Cr: 18.10-18.20%, Ni: 3.02-3.07%, Cu: 1.57-1.65%, Mo: 0.10-0.15%, N: 0.20-0.25%, and the balance being iron and inevitable impurities. The high-strength austenitic stainless steel wire for cold heading according to the present application has a full austenitic structure.

[0033] According to embodiments of the present application, there is provided a method for manufacturing a high-strength austenitic stainless steel wire for heading, to manufacture the high-strength austenitic stainless steel wire for cold heading according to the present application, the method comprising:

[0034] Step S1, soaking film treatment is performed on QN1803 stainless steel wire coils having a diameter of Φ5.5mm.

[0035] The soaking film treatment is performed on QN1803 stainless steel wire coils having a diameter of Φ5.5mm as raw materials. The film agent used is in powder form, which is dissolved in water to increase the roughness of the surface of the stainless steel wire, so as to facilitate the adhesion of the wire drawing lubricating powder.

[0036] Step S2, multi-pass drawing is performed on the QN1803 stainless steel wire coils having a diameter of Φ5.5mm after soaking film treatment, to draw the stainless steel wire into a diameter of Φ3.0mm.

[0037] The pass deformation amount of the multi-pass drawing performed on the QN1803 stainless steel wire coils having a diameter of Φ5.5mm after soaking film treatment is as follows:

[0038] 24%-22%-20%-18%-16%-14%-12%-10%, the deformation amount of each pass is reduced by 2% successively, and the stainless steel wire with a diameter of Φ3.0mm is drawn.

[0039] In step S3, the film agent on the surface of the stainless steel wire with a diameter of Φ3.0mm is removed, and the stainless steel wire with a diameter of Φ3.0mm is cleaned by using pure water.

[0040] In step S3, the film agent on the surface of the stainless steel wire with a diameter of Φ3.0mm is removed by using a ring-type powder wiping device, and the stainless steel wire with a diameter of Φ3.0mm after the film agent is removed is cleaned by using pure water.

[0041] In step S4, the stainless steel wire with a diameter of Φ3.0mm is subjected to first annealing treatment in an annealing furnace.

[0042] In the first annealing treatment of the stainless steel wire with a diameter of Φ3.0mm, the annealing furnace is divided into 6-8 temperature zones, each temperature zone is 1m long, the temperature is between 1050-1100℃, the wire speed is 6-14m / min, and ammonia gas is introduced during the annealing process. The ammonia gas is decomposed into hydrogen and nitrogen mixed gas to prevent oxidation of the stainless steel wire with a diameter of Φ3.0mm during the annealing process.

[0043] In step S5, the stainless steel wire with a diameter of Φ3.0mm after the first annealing treatment is pickled by using sulfuric acid, and the stainless steel wire with a diameter of Φ3.0mm after the pickling is cleaned by using clean water and pure water.

[0044] In the pickling of the stainless steel wire with a diameter of Φ3.0mm after the first annealing treatment, the concentration of the sulfuric acid solution is 16-21%, and the stainless steel wire with a diameter of Φ3.0mm after the pickling is cleaned by using clean water and pure water again.

[0045] In step S6, the stainless steel wire with a diameter of Φ3.0mm is subjected to second annealing treatment in an annealing furnace.

[0046] In the second annealing treatment of the stainless steel wire with a diameter of Φ3.0mm, the annealing furnace is divided into 6-8 temperature zones, each temperature zone is 1m long, the temperature is between 1050-1100℃, the wire speed is 6-14m / min, and ammonia gas is introduced during the annealing process. The ammonia gas is decomposed into hydrogen and nitrogen mixed gas to prevent oxidation of the stainless steel wire with a diameter of Φ3.0mm during the annealing process.

[0047] In step S7, the stainless steel wire with a diameter of Φ3.0mm after the second annealing treatment is subjected to film treatment, and the stainless steel wire with a diameter of Φ3.0mm after the film treatment is dried.

[0048] The diameter Φ3.0mm stainless steel wire after the second annealing treatment is subjected to film processing, the film processing uses resin film agent for lubrication, reducing the friction between the wire and the mold in the cold plastic deformation process, ensuring that the surface of the steel wire is not scratched.

[0049] The diameter Φ3.0mm stainless steel wire after the film processing is subjected to drying, the drying furnace used is 1m in length, the drying temperature is 320-380℃, and the wire speed is 6-15m / min.

[0050] Step S8, the diameter Φ3.0mm stainless steel wire is subjected to forward drawing, and is drawn into a diameter Φ2.8mm or Φ1.2mm stainless steel wire.

[0051] The pass deformation of the diameter Φ3.0mm stainless steel wire subjected to forward drawing is less than 20%, and is drawn into a diameter Φ2.8mm or Φ1.2mm stainless steel wire, and the treated stainless steel wire is coiled, packaged and finished.

[0052] In the example, the diameter Φ2.8mm high-strength austenitic stainless steel wire for cold heading is prepared by the preparation method of the application. The temperature of the annealing furnace for the first annealing is 1080℃, the stainless steel wire is pickled with sulfuric acid with a concentration of 18-20%, the temperature of the annealing furnace for the second annealing is 1080℃, the wire speed for the first annealing and the second annealing is 6m / min. The drying temperature of the drying furnace is 350℃, and the wire speed is 8m / min.

[0053] In the example, the diameter Φ1.2mm high-strength austenitic stainless steel wire for cold heading is prepared by the preparation method of the application. The temperature of the annealing furnace for the first annealing is 1080℃, the stainless steel wire is pickled with sulfuric acid with a concentration of 18-20%, the temperature of the annealing furnace for the second annealing is 1080℃, the wire speed for the first annealing and the second annealing is 8m / min. The drying temperature of the drying furnace is 350℃, and the wire speed is 10m / min.

[0054] The mechanical properties of the prepared diameter Φ2.8mm and Φ1.2mm high-strength austenitic stainless steel wire for cold heading are shown in Table 1.

[0055] Table 1 Mechanical properties of the diameter Φ2.8mm and Φ1.2mm high-strength austenitic stainless steel wire for cold heading

[0056]

[0057] As shown in Table 1, the mechanical properties of the prepared diameter Φ2.8mm high-strength austenitic stainless steel wire for cold heading are: tensile strength 800-860MPa, yield strength 610-660MPa, elongation 45-55%, and hardness HV: 380-410.

[0058] The mechanical properties of the prepared high-strength austenitic stainless steel wire with a diameter of Φ1.2 mm for cold heading are: tensile strength 950-1000 MPa, yield strength 700-750 MPa, elongation 40-45%, and hardness HV: 400-450.

[0059] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of producing a high-strength austenitic stainless steel wire for cold heading, characterized by, The preparation method comprises: S1, soaking the QN1803 stainless steel wire coil with a diameter of Φ5.5mm for film treatment; The stainless steel wire comprises the following components: by weight percentage, C: 0.06-0.08%, Si: 0.30-0.45%, Mn: 6.25-6.45%, P: 0.036-0.042%, S: 0.0008%, Cr: 18.10-18.20%, Ni: 3.02-3.07%, Cu: 1.57-1.65%, Mo: 0.10-0.15%, N: 0.20-0.25%; S2, multi-pass drawing of the QN1803 stainless steel wire coil with a diameter of Φ5.5mm after the soaking film treatment, the pass deformation of the multi-pass drawing of the QN1803 stainless steel wire coil with a diameter of Φ5.5mm after the soaking film treatment is 24%-22%-20%-18%-16%-14%-12%-10% in turn, and the stainless steel wire with a diameter of Φ3.0mm is drawn; S3, removing the film agent on the surface of the stainless steel wire with a diameter of Φ3.0mm, and cleaning the stainless steel wire with a diameter of Φ3.0mm with pure water; S4, first annealing treatment of the stainless steel wire with a diameter of Φ3.0mm by an annealing furnace, the annealing furnace for the first annealing treatment is divided into 6-8 temperature zones, each temperature zone is 1m long, the temperature is between 1050-1100℃, and ammonia gas is introduced during the annealing process; S5, pickling the stainless steel wire with a diameter of Φ3.0mm after the first annealing treatment with sulfuric acid, and cleaning the stainless steel wire with a diameter of Φ3.0mm after the pickling with clean water and pure water; S6, second annealing treatment of the stainless steel wire with a diameter of Φ3.0mm by an annealing furnace, the annealing furnace for the second annealing treatment is divided into 6-8 temperature zones, each temperature zone is 1m long, the temperature is between 1050-1100℃, and ammonia gas is introduced during the annealing process; S7, film treatment of the stainless steel wire with a diameter of Φ3.0mm after the second annealing treatment, lubrication with a resin film agent, and drying the stainless steel wire with a diameter of Φ3.0mm after the film treatment; S8, forward drawing of the stainless steel wire with a diameter of Φ3.0mm, and drawing the stainless steel wire with a diameter of Φ3.0mm into stainless steel wires with a diameter of Φ2.8mm or Φ1.2mm; The prepared high-strength austenitic stainless steel wire with a diameter of Φ2.8mm for cold heading has mechanical properties of tensile strength 800-860MPa, yield strength 610-660MPa, elongation 45-55%, and hardness HV: 380-410; The prepared high-strength austenitic stainless steel wire with a diameter of Φ1.2mm for cold heading has mechanical properties of tensile strength 950-1000MPa, yield strength 700-750MPa, elongation 40-45%, and hardness HV: 400-450.

2. The production method according to claim 1, characterized by, In step S1, the QN1803 stainless steel wire coil with a diameter of Φ5.5mm is soaked for film treatment, and the film agent used is in powder form and is dissolved in water.

3. The preparation method according to claim 1, characterized in that, In step S3, the film agent on the surface of the stainless steel wire with a diameter of Φ3.0 mm is removed by using a ring type powder wiping method.

4. The production method according to claim 1, characterized by, In step S5, the concentration of the sulfuric acid solution used for pickling the stainless steel wire with a diameter of Φ3.0 mm after the first annealing treatment is 16-21%.

5. The preparation method according to claim 1, characterized in that, In step S7, the drying furnace used for drying the stainless steel wire with a diameter of Φ3.0 mm after the film treatment has a length of 1 m and a drying temperature of 320-380℃.

6. The method of claim 1, wherein, In step S8, the pass deformation of the stainless steel wire with a diameter of Φ3.0 mm during the forward drawing is less than 20%.

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