CN111197140B - Wire rod for deep drawing cold drawing spring steel wire and preparation method thereof - Google Patents
Wire rod for deep drawing cold drawing spring steel wire and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
Abstract
The invention discloses a wire rod for deep drawing and cold drawing of spring steel wires and a preparation method thereof. By applying a series of measures such as an electric furnace, an LF furnace, a VD furnace, continuous casting process control and the like, and organically combining chemical composition optimization design, smelting process control and rolling and cooling control processes, the steel purity level of the wire rod for deep drawing is greatly improved, the N content is controlled within 70PPm, the central carbon segregation is controlled to be less than or equal to 1.09, the Soxhlet ratio is greater than or equal to 85%, and the mechanical property (same circle) fluctuation of the whole wire rod is within 50 Mpa. Overcomes the influence of the smelting residual elements and the N content of the electric furnace on the drawing performance, and realizes the synergy of the tensile strength and the sorbite rate. By optimizing the process test, partial deep-drawn products can be produced without a VD furnace under certain conditions, and the production cost is reduced. The deep drawing cold drawing spring steel wire rod obtained by the method reduces the drawing wire breaking rate and the coil spring wire breaking rate in the cold drawing process in the use process of downstream users, improves the working efficiency and obtains excellent fatigue performance.
Description
Technical Field
The invention belongs to the technical field of spring steel, and particularly relates to a wire rod for deep drawing and cold drawing of a spring steel wire and a preparation method thereof.
Background
The spring is used as an important damping and functional part, is widely applied to the automobile manufacturing industry and daily life, is a product with high added value, and has very large market demand. Statistically, the demand for springs will continue to increase, with the demand for spring steel for components also increasing in unison. For example, german spring industry association (VDFI) statistics, with 62% of its buyers in the spring steel industry, except suppliers, coming from the automotive industry. In japan, springs used for automobiles and motorcycles account for about 65% of the total amount of spring steel produced. Therefore, the strong development of the automobile industry inevitably drives the rapid development of the steel industry for automobile parts in China. The existing spring marks mainly comprise 65Mn, 60Si2MnA, 55SiCr and the like, which belong to Cr-V series, Cr-Mn series, Si-Mn series and the like respectively, have the advantages of good hardenability, high strength, excellent fatigue performance and the like, and are widely applied to the production of springs with different purposes.
The spring steel wire can be divided into a cold-drawn spring steel wire and an oil quenching tempering steel wire according to the application, the spring steel wire and the oil quenching tempering steel wire are both directly wound with the steel wire in a supply state, and the formed spring is directly used after stress relief treatment. The steel wire can be classified into a low tensile strength spring steel wire, a medium tensile strength spring steel wire and a high tensile strength spring steel wire according to strength grade, load type and diameter range, and the 65Mn cold-drawn spring steel wire belongs to the high tensile strength spring steel wire. The cold-drawn spring steel wire has high dimensional accuracy, smooth surface, no oxidation and decarburization defects and stable fatigue life, and is widely used. The spring mainly has the application of cold-drawing steel wire cold-coiling spiral springs, such as spring steel wires of shock absorbers, spring steel wires used as suspension springs, spring steel wires used as engine valves, spring steel wires used as camera shutters and the like. The steel wire for cold-rolled spring is mainly carbon spring steel wire, and the spring is not heat-treated or only heated at low temperature after cold-rolled and formed.
The traditional process for preparing the cold-drawn spring steel wire by using the wire rod comprises the following steps: wire rod → acid cleaning → phosphorization → drawing → heat treatment (lead bath treatment or quenching + medium temperature tempering) → drawing → finished product, however, the production process of the 65Mn wire rod drawing spring steel wire of more users at present changes, the middle wire heat treatment step is omitted, and the process changes: wire rod → acid cleaning → phosphorization → saponification → drawing → finished product. The method omits a straight-pull production process after heat treatment, and provides higher requirements for indexes such as cleanliness, center structure compactness, grain size, surface quality and the like of the wire rod.
Disclosure of Invention
In view of the above, the invention provides a wire rod for deep drawing and cold drawing of spring steel wires and a preparation method thereof, wherein the deep drawing performance is improved and improved after certain components are added and multiple groups of components are optimized, and the problems of high wire breakage rate in drawing and wire breakage rate and incapability of realizing deep drawing in a straight drawing production process after heat treatment in the process of smelting the wire rod for deep drawing and cold drawing of spring steel wires by an electric furnace are solved in cooperation with the improvement of the preparation process.
The invention provides a wire rod for deep drawing and cold drawing of spring steel wires, which comprises the following components in percentage by mass: c: 0.60-0.67%, Si: 0.2-0.3%, Mn: 0.8-1.2%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, Cu: 0-0.2, As: 0-0.020%, Sn: 0-0.010%, Cr: 0 to 0.1 percent of the total weight of the alloy, less than or equal to 0.0020 percent of O, less than or equal to 0.0070 percent of N and the balance of Fe.
Preferably, the sorbite rate of the wire rod for the deep-drawing cold-drawn spring steel wire is 85-95%.
The invention provides a preparation method of the wire rod for the deep-drawing cold-drawn spring steel wire, which comprises the following steps:
s1, smelting in an electric furnace: pure oxygen smelting in the whole process, low N recarburizing agent recarburization, electric furnace end point control C: 0.06% -0.10%, adding deoxidizer into the electric furnace tapping to obtain the product with water oxygen activity less than or equal to 20X 10-6The molten steel of (2);
s2, refining in an LF furnace: refining the molten steel obtained in the step S1 in an LF furnace, and controlling the oxygen activity of the obtained LF molten steel to be less than or equal to 10 multiplied by 10-6；
S3, continuous casting: controlling the center carbon segregation index to be 1.00-1.15 to obtain a steel billet meeting the chemical composition requirement of claim 1;
s4, heating the steel billet by a heating furnace, rolling, and cooling under control to obtain a product, wherein the rolling comprises the following steps: the initial rolling temperature is controlled to be 1000-1030 ℃, the inlet temperature of a pre-finish rolling mill is controlled to be 880-900 ℃, the pre-finish rolling is carried out, then, the pre-finish rolling is carried out, the cooling is carried out, then, the finish rolling is carried out, the inlet temperature of the finish rolling is 850-930 ℃, the diameter reducing and sizing temperature is 850-880 ℃, and the spinning temperature is 860-900 ℃.
Preferably, in step S1, an aluminum block is used as a deoxidizer; in step S2, the LF furnace is deoxidized by combining silicon carbide and aluminum particles, and the alkalinity of the slag is controlled to be 3.0-3.5.
Preferably, in step S2, after the refining in the LF furnace is completed, the vacuum treatment is performed by using a VD furnace, and the vacuum treatment conditions are as follows: the pressure is less than or equal to 67Pa, and the pressure maintaining time is 10-30 min.
Preferably, in step S3, the continuous casting is performed by three-flow casting or four-flow casting, and the degree of superheat is controlled to be 15-35 ℃; the three-flow casting corresponding drawing speed is 1.8-2.2m/min, and the four-flow casting corresponding drawing speed is 1.6-2.0 m/min.
Preferably, in step S4, the heating by the heating furnace includes: the temperature of the soaking section is controlled to be 1050-.
Preferably, in step S4, high-pressure water is used for dephosphorization after heating, the dephosphorization water pressure is greater than 18Mpa, and the rolling is performed after dephosphorization.
Preferably, the controlling cooling in step S4 includes: cooling by adopting a Steyr air cooling line, starting a fan after spinning, covering a heat preservation cover behind the fan for slow cooling, and controlling the temperature of the cover placed at the lap joint point to be 550-580 ℃.
Compared with the prior art, the invention has the following advantages:
(1) the electric furnace smelting, LF furnace refining and continuous casting process adopted by the invention are controlled, so that the purity of the wire rod for deep drawing is reduced to 5-12ppm, and the level of steel purity is greatly improved.
(2) The invention strictly controls the electric furnace and LF furnace process, controls the N content of the deep drawing steel wire rod within 70PPm, and meets the drawing requirement of the common 65Mn wire rod. The deep-drawn product can realize VD-free production, and the production cost is reduced.
(3) The invention organically combines the adjustment of chemical components with the controlled rolling and controlled cooling process, overcomes the influence of the content of residual elements and N in electric furnace smelting on the strength, and realizes the synergy of tensile strength and sorbite rate.
(4) The wire rod sorbite rate of the high-temperature spinning provided by the invention is more than 1-1.5 grade (90-95%). The average tensile strength of the wire rod under the high-temperature spinning process is 20MPa higher than that under the low-temperature spinning process. By reducing the heating temperature and the initial rolling temperature, the face shrinkage is improved to some extent, and the tail face shrinkage is obviously improved.
(5) The wire rod provided by the invention can adapt to the condition that a straight-pull production process after heat treatment is omitted by a user, the wire breakage rate of the wire rod in drawing is reduced, deep drawing can be realized, and the wire rod has a good application prospect.
Drawings
FIGS. 1A, 1B and 1C are schematic diagrams showing a metallographic structure and edge decarburization of a 65Mn spring steel wire rod in an example of the present invention, and the scale on the upper left corner in FIGS. 1A, 1B and 1C is 30 μm.
Fig. 2A, 2B and 2C are schematic views of pearlite inter-lamellar spacing of 65Mn spring steel wire rods in examples of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited to the following specific examples.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The invention provides a wire rod for deep drawing and cold drawing of spring steel wires, which comprises the following components in percentage by mass: c: 0.60-0.67%, Si: 0.2-0.3%, Mn: 0.8-1.2%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, Cu: 0-0.2, As: 0-0.020%, Sn: 0-0.010%, Cr: 0 to 0.1 percent of the total weight of the alloy, less than or equal to 0.0020 percent of O, less than or equal to 0.0070 percent of N and the balance of Fe.
Preferably, the sorbite rate of the wire rod for the deep-drawing cold-drawn spring steel wire is 85-95%.
The invention provides a preparation method of the wire rod for the deep-drawing cold-drawn spring steel wire, which comprises the following steps:
s1, smelting in an electric furnace: pure oxygen smelting in the whole process, low N recarburizing agent recarburization, electric furnace end point control C: 0.06% -0.10%, adding deoxidizer into the electric furnace tapping to obtain the product with water oxygen activity less than or equal to 20X 10-6The molten steel of (2);
s2, refining in an LF furnace: refining the molten steel obtained in the step S1 in an LF furnace, and controlling the oxygen activity of the obtained LF molten steel to be less than or equal to 10 multiplied by 10-6；
S3, continuous casting: controlling the center carbon segregation index to be 1.00-1.15 to obtain a steel billet meeting the chemical composition requirement of claim 1;
s4, heating the steel billet by a heating furnace, rolling, and cooling under control to obtain a product, wherein the rolling comprises the following steps: the initial rolling temperature is controlled to be 1000-1030 ℃, the inlet temperature of a pre-finish rolling mill is controlled to be 880-900 ℃, the pre-finish rolling is carried out, then, the pre-finish rolling is carried out, the cooling is carried out, then, the finish rolling is carried out, the inlet temperature of the finish rolling is 850-930 ℃, the diameter reducing and sizing temperature is 850-880 ℃, and the spinning temperature is 860-900 ℃.
The wire rod for deep drawing and cold drawing spring steel wire and the preparation method thereof according to the present invention will be described in detail with reference to specific examples.
Example 1
The embodiment provides a wire rod for deep drawing and cold drawing of spring steel wires and a preparation method thereof. The hot rolled wire rod is rolled by the steps of electric furnace smelting, LF furnace refining, continuous casting, heating by a heating furnace, rolling, controlled cooling and the like. The specific production steps are as follows: scrap steel sorting → electric furnace → LF → VD → continuous casting 150 square billet → inspection → 150mm × 150mm billet → heating → high pressure water descaling → roughing mill group → medium mill group → pre-finishing mill group → water tank → reducing and sizing mill group → water tank → laying head → stelmor cooling → coil gathering → P & F line → shear head, tail → quality inspection, sampling → bundling → weighing → sign → coil unloading → warehousing. The specific production process is as follows:
electric furnace smelting: tapping and slag stopping are adopted, so that slag does not enter a steel ladle; adding aluminum blocks into electric furnace tappingIs a deoxidizer. Modifying top slag after tapping, reducing the content of FeO and MnO in slag, and requiring that the oxygen activity of molten steel entering LF is less than or equal to 20 x 10-6. In the aspect of reducing nitrogen increase of the electric furnace, foam slag is produced by reasonably spraying carbon; avoid arc light exposure and reduce nitrogen increase. Pure oxygen smelting is carried out in the whole process. And a low-N carburant is used for carburant in the carburant process. And (3) controlling the end point of the electric furnace by C weight percent: 0.06 percent to 0.10 percent.
Refining in an LF furnace: and the LF adopts the combined deoxidation of silicon carbide and aluminum particles, the alkalinity of the slag is controlled to be 3.0-3.5, and the white slag refining is ensured. The LF in and out station adjusts the fluidity of the slag, and molten steel is turned over without exposing the molten steel. To find the LF molten steel oxygen activity less than or equal to 10 x 10-6. Ensuring the soft blowing time to be ten minutes.
And (3) VD furnace: whether a VD furnace is adopted for vacuum treatment is selected according to needs, and products meeting the drawing requirements of common 65Mn wire rods can be obtained by omitting the step of the VD furnace. When a VD furnace is adopted for vacuum treatment, the conditions are as follows: the pressure is less than or equal to 67Pa, and the pressure maintaining time is 10min-30 min.
Continuous casting: respectively adopting different pulling speeds when three-flow casting and four-flow casting are adopted, and controlling the superheat degree to be 15-35 ℃; the three-stream drawing speed is 1.8-2.2m/min, the four-stream drawing speed is 1.6-2.0m/min, and the center carbon segregation index is controlled to be 1.00-1.15, so that the steel billet meeting the chemical composition requirement is obtained.
Heating a billet heating furnace: the temperature of the soaking section is 1050-; controlling the temperature deviation of the head and the tail of the billet to be 0-20 ℃; controlling the temperature deviation between the center and the surface of the blank to be 0-30 ℃; controlling the atmosphere in the furnace well, wherein the air-coal ratio is controlled within the range of 9: 1-12: 1, so that the interior of the furnace is controlled according to a micro reducing atmosphere, and the surface oxidation of the steel billet in the furnace is prevented from being aggravated. Starting high-pressure water to remove scale, wherein the pressure of the dephosphorization water is more than 18Mpa, and ensuring that the surface iron scale is removed completely. Strictly in the furnace for 1.5-2.5 hours.
Rolling: the initial rolling temperature is controlled to be 1000-1030 ℃, and the inlet temperature of a pre-finish rolling mill is controlled to be 880-900 ℃. After pre-finish rolling and before finish rolling, water tank-recovery section-water tank-recovery section two-section alternative water cooling is adopted, so that the finish rolling inlet temperature is 850-930 ℃, the reducing sizing temperature is 850-880 ℃, and the spinning temperature is 860-900 ℃, so as to achieve the purposes of low-temperature spinning and prevention of abnormal grain growth.
And (3) controlling cooling: in the cooling process of the air cooling line adopting the Steyr mill, the fan is started after spinning, the heat preservation cover is covered at the position 3m behind the fan for slow cooling, and the temperature of the cover arranged at the lap joint position is controlled at 550-580 ℃.
In the following examples, a trial production of a 65Mn spring steel 4 furnace was performed exactly according to the above-described production process of a 65Mn spring steel. The first two furnaces are processed by EAF → LF → VD → CCM, and are respectively named as a sample I and a sample II; the last two furnaces are subjected to non-vacuum treatment, and the process is EAF → LF → CCM and is respectively named as a sample three and a sample four. The indexes of the obtained heat steel after inspection are shown in tables 1 and 2 and fig. 1A to 2C.
TABLE 1 chemical composition of 65Mn spring steel for each furnace
As can be seen from Table 1, the nitrogen content in the vacuum treatment furnace was about 10ppm lower than that in the non-vacuum treatment furnace. The VD furnace-free experiment can control the N content of 65Mn steel within 70PPm, and the drawing requirement of common 65Mn wire rods is met. The deep drawing product can be produced without a VD furnace under certain conditions, and the production cost is reduced.
TABLE 2 center segregation of elements C
The chemical composition of the center C, S, Mn of the cast slab was analyzed by three-point sampling, and the degree of segregation was as shown in table 2, and the carbon segregation index was at most 1.09.
TABLE 365 Mn spring Steel wire rod chemical composition
The composition of the 65Mn spring steel wire rod after rolling is shown in table 3.
Taking a circle of wire rod of three specifications of 1#, 2#, and 3#, and drawing 7 wires in each circle, corresponding to the results of numbers 1-7, the results of wire rods with phi 6.5mm are shown in table 4, and the wire rods with other specifications are similar to the results.
TABLE 465 Mn spring steel phi 6.5mm wire rod mechanical property results
As can be seen from tables 3 and 4 and fig. 1A to 2C, the synergy between the tensile strength and the sorbite ratio is achieved by the organic combination of the chemical composition adjustment and the controlled rolling and cooling process. The sorbite rate of the wire rod is in grade 1, namely, the free ferrite is very little.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (2)
1. The preparation method of the wire rod for the deep drawing cold drawing spring steel wire comprises the following components in percentage by mass: c: 0.60-0.67%, Si: 0.2-0.3%, Mn: 0.8-1.2%, P is less than or equal to 0.02%, S is less than or equal to 0.02%, Cu: 0-0.2, As: 0-0.020%, Sn: 0-0.010%, Cr: 0-0.1%, less than or equal to 0.0020% of O, less than or equal to 0.0070% of N, and the balance of Fe, wherein the sorbite rate of the wire rod is 85-95%, and the preparation steps comprise:
s1, smelting in an electric furnace: pure oxygen smelting in the whole process, low N recarburizing agent recarburization, electric furnace end point control C: 0.06% -0.10%, adding deoxidizer into the electric furnace tapping to obtain the product with water oxygen activity less than or equal to 20X 10-6The molten steel of (2) adopts an aluminum block as a deoxidizer;
s2, refining in an LF furnace: refining the molten steel obtained in the step S1 in an LF furnace, and controlling the oxygen activity of the obtained LF molten steel to be less than or equal to 10 multiplied by 10-6Ensuring the soft blowing time to be ten minutes, carrying out combined deoxidation in the LF furnace by adopting silicon carbide and aluminum particles, and controlling the alkalinity of the slag to be 3.0-3.5;
s3, continuous casting: controlling the center carbon segregation index to be 1.00-1.15 to obtain a steel billet meeting the chemical composition requirement, wherein the continuous casting adopts three-flow casting and four-flow casting, and the superheat degree is controlled to be 15-35 ℃; the three-flow casting corresponding drawing speed is 1.8-2.2m/min, and the four-flow casting corresponding drawing speed is 1.6-2.0 m/min;
s4, heating the steel billet in a heating furnace, then removing phosphorus by adopting high-pressure water, wherein the phosphorus removal water pressure is more than 18Mpa, rolling after removing phosphorus, and controlling cooling after rolling to obtain a product, wherein the heating in the heating furnace comprises the following steps: controlling the temperature of a soaking section 1050-: controlling the initial rolling temperature to be 1000-1030 ℃, the inlet temperature of a pre-finish rolling mill to be 880-900 ℃, pre-finish rolling, cooling, then finish rolling, wherein the inlet temperature of the finish rolling is 850-930 ℃, the final reduction sizing temperature is 850-880 ℃, the spinning temperature is 860-900 ℃, a Steyr mill air cooling line is adopted for cooling, a fan is started after spinning, a heat preservation cover is covered behind the fan for slow cooling, and the temperature of a lap joint position placing cover is controlled to be 550-580 ℃.
2. The method for manufacturing a wire rod for a deep drawn cold drawn spring steel wire according to claim 1, wherein: in step S2, after the refining in the LF furnace is completed, vacuum processing is performed in the VD furnace, where the vacuum processing conditions are: the pressure is less than or equal to 67Pa, and the pressure maintaining time is 10-30 min.
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