CN111187984A - Steel for worm gear and worm transmission device and preparation method thereof - Google Patents
Steel for worm gear and worm transmission device and preparation method thereof Download PDFInfo
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- CN111187984A CN111187984A CN202010095569.6A CN202010095569A CN111187984A CN 111187984 A CN111187984 A CN 111187984A CN 202010095569 A CN202010095569 A CN 202010095569A CN 111187984 A CN111187984 A CN 111187984A
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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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses steel for a worm gear transmission device and a preparation method thereof, wherein a proper amount of alloy elements such as manganese, chromium and the like are added into the steel for the worm gear transmission device, can obtain higher surface hardness and wear resistance, low-temperature impact toughness and the like, has good use effect after carburization and quenching, is mainly used for manufacturing parts such as gears, worms, sealing shaft sleeves and the like, in the preparation method, the longitudinal welded pipe is used for replacing a seamless welded pipe, the problems of complex process, serious abrasion, larger sliding friction resistance and high price of the traditional worm gear and worm transmission device are solved, in the aspect of controlling the shape and the surface quality, reasonable measures such as higher heating temperature, higher finishing temperature, lower coiling temperature and the like are adopted, the method can ensure excellent plate shape, and the produced steel completely meets the use requirements of users with excellent performance and good plate shape and quality.
Description
Technical Field
The invention relates to the technical field of steel preparation, and particularly provides steel for a worm gear and worm transmission device and a preparation method thereof.
Background
The traditional gear steel adopts an electric furnace smelting-VOD refining-continuous casting-high-speed rod and wire production line, and the thickness specification is 3.0 mm-10.0 mm. The traditional worm gear and worm transmission device has the problems of complex process, serious abrasion, larger sliding friction resistance and high price.
The traditional worm gear and worm transmission device is high in manufacturing cost, economic benefits of enterprises are greatly reduced, the survival crisis is met, and the substitute materials capable of meeting actual production manufacturing and performance requirements of special steel for the worm gear and worm need to be researched and developed urgently to reduce the production cost of the enterprises.
Disclosure of Invention
In view of the above, the present invention aims to provide a steel material for a worm gear transmission device and a preparation method thereof, so as to solve the problems of high cost and poor performance of the existing steel material for the worm gear transmission device.
The invention provides a steel material for a worm gear transmission device, which comprises the following components in percentage by mass: c: 0.10 to 0.25 wt%, Si: 0.10 to 0.40 wt%, Mn: 1.0 to 1.5 wt%, S: 0.003-0.015 wt%, P: 0.003 to 0.020 wt%, Cr: 0.80-1.20 wt%, Al: 0.015 to 0.055 wt%, N: 0.0010 to 0.0050 wt%, Ca: 0.0010-0.0050 wt%, and the balance of Fe and other unavoidable impurities.
The invention also provides a preparation method of the steel for the worm gear and worm transmission device, which comprises the following steps:
1) pretreatment of molten iron
Pretreating molten iron to ensure that the mass ratio of S in the molten iron fed into the converter is less than or equal to 0.003 percent, and feeding the molten iron into the converter after completely slagging off;
2) smelting in a converter
Smelting refined scrap steel and molten iron; the converter draws carbon for one time, and avoids point blowing; tapping adopts high manganese and ferrosilicon, argon purging is carried out on a steel ladle before tapping, a tapping hole is controlled, free flow is avoided, and the mass content of Als in the steel ladle is 0.010-0.030%; n in the steel ladle is less than or equal to 20 ppm;
3) LF refining
The LF treatment process keeps micro-positive pressure, and the N increase amount is less than or equal to 10 ppm; the LF adopts active lime and fluorite to produce reducing slag, controls the argon blowing strength and avoids the exposure of molten steel; calcium treatment is carried out by adopting calcium silicate wires, and 400-500 m CaSi wires are fed, so that inclusions are fully spheroidized, and the product performance is improved;
4) continuous casting
Protective pouring is carried out in the whole process, argon is adopted to purge the tundish before pouring, no molten steel is exposed in the pouring process, N is strictly controlled to be absorbed at a water port, and the increase of N is controlled to be less than or equal to 4 ppm; high-alkalinity slag inclusion is adopted to facilitate the removal of inclusions in steel; the constant drawing speed is kept in the steel casting process; the control target of the continuous casting superheat degree is not more than 30 ℃;
5) heating in a furnace
The heating temperature is 1220-1260 ℃, and the heat preservation time is 30-40 minutes;
6) hot continuous rolling, rolling and coiling to obtain the steel plate
The rough rolling is controlled by selecting a 3+3 mode; the finishing temperature is as follows: more than or equal to 870 ℃; the coiling temperature is less than or equal to 500 ℃, and the cooling mode adopts a sixth group of opening cooling and intermittent cooling mode;
7) thermal treatment
Carrying out 850-950 ℃ oil quenching and 100-3500 ℃ tempering on the steel plate prepared in the step 6), wherein the metallographic structure is as follows: tempering martensite;
8) ERW pipe making
Performing ERW pipe making to obtain the target steel.
Preferably, in the step 4), the steel casting process is performed under a soft reduction function.
More preferably, the step 6) further comprises the step of performing small scale removal after the F1 and F2 machines.
More preferably, in step 6), the finish rolling reduction ratio is not less than 4.0.
According to the steel for the worm gear transmission device, after micro alloy elements such as manganese, silicon, chromium and the like are added into steel, a compact and strong-adhesion oxide protective layer is formed on the surface of the steel, so that the inward diffusion and development of external gas and oxides can be prevented, a matrix below the oxide layer is protected, an oxide compact layer with the thickness of about 40-90 mu m is formed between the protective layer and the surface of the steel matrix, and the compact oxide layer prevents oxygen and water in the external environment air from permeating into the steel matrix, prevents the corrosion of the oxide layer of a steel material and improves the wear resistance of the steel material.
The effects of the components in the steel are given below:
c is an element for improving the strength of steel, and in order to enable the strength of steel to reach a level of more than 880MPa, the content of C is required to be more than 0.10 wt%, and good wear resistance, welding performance, cold brittleness performance, stamping performance and the like are ensured, so that the content of C is controlled to be 0.10-0.25 wt%.
P is one of the most effective alloy elements for improving the atmospheric corrosion resistance of steel, and P in the steel is an anode depolarizer which can accelerate the uniform dissolution of the steel and Fe in the steel2+The oxidation rate of (2) is favorable for forming a compact oxide protective film on the surface of the steel, and the protective film becomes a protective barrier for corrosion media to enter the steel base. The P content in the steel is more than 0.020 wt% so that the toughness is greatly reduced, and therefore, the content of the P is controlled between 0.003 and 0.020 wt%.
Cr can form a compact oxide layer on the surface of steel, the passivation capability of steel is improved, the content of Cr is improved, the refining of α -FeOOH is facilitated, when the Cr content in α -FeOOH of an oxide layer/metal interface exceeds 5%, the invasion of corrosive anions can be effectively inhibited, meanwhile, the Cr element is added, the conversion of Fe3+ to Fe2+ can be prevented, the wear resistance of the steel is improved, and the content of Cr is controlled within the range of 0.80-1.20 wt%.
Si is usually added as a deoxidizer, so that the strength of the steel can be improved, the adhesion performance of the surface of the steel can be improved, and the wear resistance of the steel can be improved. However, since the toughness of the steel is lowered when the Si content exceeds 0.4 wt%, the Si content is controlled to be 0.10 to 0.40 wt% in the present invention.
Ca is added into the gear steel to improve the integral wear resistance of the steel, and a small amount of Ca is added into the steel to form a CaO and CaS compound and promote an oxide layer to be converted into a compact protective film with good protection. The content of Ca is controlled to be 0.0010-0.0050 wt%.
Mn can improve the strength of steel, is one of main elements for improving hardenability, can improve the wear resistance and fatigue property of steel to a certain extent, however, the toughness and weldability of the steel are reduced by using excessive Mn, so that the content of Mn is controlled to be 1.0-1.5 wt%.
S has adverse effect on the wear resistance of the gear steel, but can form an oxide layer by compounding with manganese and chromium, so that the wear resistance and the fatigue performance of the steel are improved, and the content of the S is controlled to be 0.003-0.015 wt%.
Al is an element added as a deoxidizer in steel, a certain amount of aluminum is added into molten steel, aluminum and oxygen react to generate aluminum oxide under a high-temperature condition, the aluminum oxide floats on the surface of the molten steel in the form of residue, the residue is removed to control the oxygen content in the molten steel, impurities in the steel can be effectively reduced, the quality of the steel is improved, and the aluminum deoxidizer plays an important role. In the invention, the content is controlled to be 0.015-0.055 wt%.
N: the steel can remove partial harmful gas impurities and mechanical impurities in the smelting process, the performance of steel is improved, the quality of the steel is improved, and if the content of N is too high, the impact toughness of the steel is influenced, and failure hardening is caused. Therefore, the content of the compound is controlled to be 0.0010-0.0050 wt%.
The steel for the worm and gear transmission device provided by the invention is added with a proper amount of alloy elements such as manganese, chromium and the like, has better hardenability and machinability, can obtain higher surface hardness and wear resistance, low-temperature impact toughness and the like for parts with larger cross sections after heat treatment, has good use effect after carburization and quenching, and is mainly used for manufacturing parts such as gears, worms, sealing shaft sleeves and the like.
According to the preparation method of the steel for the worm gear and worm transmission device, the proper alloy elements such as manganese and chromium are added, the hot rolled plate replaces a rod, the straight welded pipe replaces a seamless welded pipe, the problems that the existing traditional worm gear and worm transmission device is complex in process, serious in abrasion, large in sliding friction resistance and high in price are solved, and through actual measurement and calculation, the process cost is 1/3 of the original process cost, the production and manufacturing cost of the worm gear and worm can be greatly reduced, the market competitiveness of the worm gear and worm transmission device is improved, and meanwhile a large amount of alloy cost can be saved.
On the aspect of mechanical property, each index of the steel provided by the invention meets the requirement, and the allowance is sufficient; the wear resistance and the service life both meet the use requirements of users; in the aspect of controlling the plate shape and the surface quality, reasonable measures such as higher heating temperature, higher finish rolling temperature, lower coiling temperature and the like are adopted, so that the excellent plate shape can be ensured, the produced steel has excellent performance and good plate shape and quality, the use requirements of users are completely met, the cost of enterprises is reduced, the higher finished product quality and yield are reflected, and the good economic benefit is achieved.
Detailed Description
The invention will be further explained with reference to specific embodiments, without limiting the invention.
The invention provides a steel material for a worm gear transmission device, which comprises the following components in percentage by mass: c: 0.10 to 0.25 wt%, Si: 0.10 to 0.40 wt%, Mn: 1.0 to 1.5 wt%, S: 0.003-0.015 wt%, P: 0.003 to 0.020 wt%, Cr: 0.80-1.20 wt%, Al: 0.015 to 0.055 wt%, N: 0.0010 to 0.0050 wt%, Ca: 0.0010-0.0050 wt%, and the balance of Fe and other unavoidable impurities.
The invention also provides a preparation method of the steel for the worm gear and worm transmission device, which comprises the following steps:
1) pretreatment of molten iron
Pretreating molten iron to ensure that the mass ratio of S in the molten iron fed into the converter is less than or equal to 0.003 percent, and feeding the molten iron into the converter after completely slagging off;
2) smelting in a converter
Smelting refined scrap steel and molten iron; the converter draws carbon for one time, and avoids point blowing; tapping adopts high manganese and ferrosilicon, argon purging is carried out on a steel ladle before tapping, a tapping hole is controlled, free flow is avoided, and the mass content of Als in the steel ladle is 0.010-0.030%; n in the steel ladle is less than or equal to 20 ppm;
3) LF refining
The LF treatment process keeps micro-positive pressure, and the N increase amount is less than or equal to 10 ppm; the LF adopts active lime and fluorite to produce reducing slag, controls the argon blowing strength and avoids the exposure of molten steel; calcium treatment is carried out by adopting calcium silicate wires, and 400-500 m CaSi wires are fed, so that inclusions are fully spheroidized, and the product performance is improved;
4) continuous casting
Protective pouring is carried out in the whole process, argon is adopted to purge the tundish before pouring, no molten steel is exposed in the pouring process, N is strictly controlled to be absorbed at a water port, and the increase of N is controlled to be less than or equal to 4 ppm; high-alkalinity slag inclusion is adopted to facilitate the removal of inclusions in steel; preferably, the steel casting process has the function of soft reduction; the constant drawing speed is kept in the steel casting process; controlling the superheat degree of continuous casting to be not more than 30 ℃, carrying out hot overheating loading on the plate blank, and placing the rest plate blank in a slow cooling area in a warehouse;
5) heating in a furnace
The heating temperature is 1220-1260 ℃, the heat preservation time is 30-40 minutes, the alloying elements can be fully ensured to be melted, so that the high-strength steel has a better product of strength and elongation and a good plate shape during rolling, the requirements of the rolling process are met, the atmosphere of a furnace chamber of a heating furnace is controlled, the generation of casting blank iron scales is reduced, the uniform heating temperature is ensured, and a foundation is provided for ensuring the plate shape;
6) hot continuous rolling, rolling and coiling to obtain the steel plate
The rough rolling is controlled by selecting a 3+3 mode; adjusting the load distribution of the finish rolling model to ensure the rolling stability; the finishing temperature is as follows: more than or equal to 870 ℃; the coiling temperature is less than or equal to 500 ℃, a fine and uniform tissue can be obtained, and a sixth group of opening cooling and intermittent cooling mode is adopted in a cooling mode; selectively throwing the steel strip into an F1 machine or an F2 machine for small scale removal according to the actual condition of the surface of the steel strip; meanwhile, the control of the cooling water amount between the racks is optimized and adjusted, preferably, in the step 6), the finish rolling compression ratio is more than or equal to 4.0, the metallographic structure and the physical property of the steel can be improved, and the quality of a final product is improved; the excellent plate shape is ensured by measures such as reasonable heating temperature, higher finishing temperature, low-temperature coiling temperature and the like, wherein fine and uniform tissues can be obtained by low-temperature coiling;
7) thermal treatment
Performing 850-950 ℃ oil quenching and 100-3500 ℃ tempering on the steel plate prepared in the step 6), wherein the metallographic structure is tempered martensite;
8) ERW pipe making
Performing ERW pipe making to obtain the target steel.
Example 1
Preparing steel for the worm gear transmission device according to the following mass percentages: c: 0.10 to 0.25 wt%, Si: 0.10 to 0.40 wt%, Mn: 1.0 to 1.5 wt%, S: 0.003-0.015 wt%, P: 0.003 to 0.020 wt%, Cr: 0.80-1.20 wt%, Al: 0.015 to 0.055 wt%, N: 0.0010 to 0.0050 wt%, Ca: 0.0010-0.0050 wt%, and the balance of Fe and other unavoidable impurities.
The preparation method comprises the following steps:
1) pretreatment of molten iron
Pretreating molten iron to ensure that the mass ratio of S in the molten iron fed into the converter is less than or equal to 0.003 percent, and feeding the molten iron into the converter after completely slagging off;
2) smelting in a converter
Smelting refined scrap steel and molten iron; the converter draws carbon for one time, and avoids point blowing; tapping adopts high manganese, ferrosilicon and ferromolybdenum, argon purging is carried out on a steel ladle before tapping, a tapping hole is controlled, free flow is avoided, and the mass content of Als in the steel ladle is 0.010-0.030%; n in the steel ladle is less than or equal to 20 ppm;
3) LF refining
The LF treatment process keeps micro-positive pressure, and the N increase amount is less than or equal to 10 ppm; the LF adopts active lime and fluorite to produce reducing slag, controls the argon blowing strength and avoids the exposure of molten steel; calcium treatment is carried out by adopting a calcium silicate wire, and a CaSi wire is fed for 500 meters, so that inclusions are fully spheroidized, and the product performance is improved;
4) continuous casting
Protective pouring is carried out in the whole process, argon is adopted to purge the tundish before pouring, no molten steel is exposed in the pouring process, N is strictly controlled to be absorbed at a water port, and the increase of N is controlled to be less than or equal to 4 ppm; high-alkalinity slag inclusion is adopted to facilitate the removal of inclusions in steel; the soft reduction function is put into the steel casting process; the constant drawing speed is kept in the steel casting process; controlling the superheat degree of continuous casting to be not more than 30 ℃, carrying out hot overheating loading on the plate blank, and placing the rest plate blank in a slow cooling area in a warehouse;
5) heating in a furnace
The heating temperature is 1220 ℃, the heat preservation time is 40 minutes, the alloying elements can be fully ensured to be melted, so that the high-strength steel has better product of strength and elongation and good plate shape during rolling, the requirements of the rolling process are met, the furnace chamber atmosphere of the heating furnace is controlled, the generation of casting blank iron scale is reduced, the uniform heating temperature is ensured, and a foundation is provided for ensuring the plate shape;
6) hot continuous rolling, rolling and coiling to obtain the steel plate
The rough rolling is controlled by selecting a 3+3 mode; adjusting the load distribution of the finish rolling model to ensure the rolling stability; the finishing temperature is as follows: 870 ℃; the coiling temperature is 500 ℃, a fine and uniform tissue can be obtained, and a sixth group of opening cooling and intermittent cooling modes are adopted in a cooling mode; selectively throwing the steel strip into an F1 machine or an F2 machine for small scale removal according to the actual condition of the surface of the steel strip; meanwhile, the control of the cooling water amount between the racks is optimized and adjusted, wherein in the step 6), the finish rolling compression ratio is more than or equal to 4.0, the metallographic structure and the physical property of the steel can be improved, and the quality of a final product is improved; the good plate shape is ensured through measures such as reasonable heating temperature, higher finish rolling temperature, low-temperature coiling temperature and the like;
7) thermal treatment
Carrying out 850 ℃ oil quenching and 100 ℃ tempering on the steel plate prepared in the step 6), wherein the metallographic structure is as follows: tempering martensite;
8) ERW pipe making
According to the requirements of a pipe mill, ERW pipe manufacturing is carried out to obtain the target steel.
Example 2
Preparing steel for the worm gear transmission device according to the following mass percentages: c: 0.10 to 0.25 wt%, Si: 0.10 to 0.40 wt%, Mn: 1.0 to 1.5 wt%, S: 0.003-0.015 wt%, P: 0.003 to 0.020 wt%, Cr: 0.80-1.20 wt%, Al: 0.015 to 0.055 wt%, N: 0.0010 to 0.0050 wt%, Ca: 0.0010-0.0050 wt%, and the balance of Fe and other unavoidable impurities.
The preparation method differs from example 1 in that:
in the step 5), the heating temperature is 1260 ℃, and the heat preservation time is 30 minutes;
in step 6), the finish rolling temperature: 900 ℃; coiling temperature: 400 ℃;
in the step 8), the oil quenching temperature is 950 ℃ and the tempering temperature is 3500 ℃.
Comparative example 1
The preparation process in the background technology is adopted to prepare the seamless tube:
electric furnace smelting, VOD refining, continuous casting, high-speed rod and wire production line, cold drawing, heat treatment and seamless pipe.
The target steels meeting the target composition ranges obtained in examples 1 and 2 and the seamless pipes obtained in comparative example 1 were subjected to performance tests, respectively.
The test results are shown in the following table:
| number plate | Yield strength Rt0.5 | Tensile strength Rm | Elongation% A |
| Standard of merit | ≥635 | 880～1180 | ≥9 |
| Example 1 | 715 | 980 | 15 |
| Example 2 | 710 | 970 | 14 |
| Comparative example 1 | 780 | 925 | 9 |
And (4) conclusion: on the aspect of mechanical property, each index of the steel provided by the invention meets the requirement, and the allowance is sufficient; the wear resistance and the service life both meet the use requirements of users; meanwhile, the cost is low, the quality and the yield of finished products are high, and good economic benefits are achieved.
Claims (5)
1. The steel material for the worm gear transmission device is characterized by comprising the following components in percentage by mass: c: 0.10 to 0.25 wt%, Si: 0.10 to 0.40 wt%, Mn: 1.0 to 1.5 wt%, S: 0.003-0.015 wt%, P: 0.003 to 0.020 wt%, Cr: 0.80-1.20 wt%, Al: 0.015 to 0.055 wt%, N: 0.0010 to 0.0050 wt%, Ca: 0.0010-0.0050 wt%, and the balance of Fe and other unavoidable impurities.
2. The method for producing a steel material for a worm gear according to claim 1, comprising the steps of:
1) pretreatment of molten iron
Pretreating molten iron to ensure that the mass ratio of S in the molten iron fed into the converter is less than or equal to 0.003 percent, and feeding the molten iron into the converter after completely slagging off;
2) smelting in a converter
Smelting refined scrap steel and molten iron; the converter draws carbon for one time, and avoids point blowing; tapping adopts high manganese and ferrosilicon, argon purging is carried out on a steel ladle before tapping, a tapping hole is controlled, free flow is avoided, and the mass content of Als in the steel ladle is 0.010-0.030%; n in the steel ladle is less than or equal to 20 ppm;
3) LF refining
The LF treatment process keeps micro-positive pressure, and the N increase amount is less than or equal to 10 ppm; the LF adopts active lime and fluorite to produce reducing slag, controls the argon blowing strength and avoids the exposure of molten steel; calcium treatment is carried out by adopting calcium silicate wires, and 400-500 m CaSi wires are fed, so that inclusions are fully spheroidized, and the product performance is improved;
4) continuous casting
Protective pouring is carried out in the whole process, argon is adopted to purge the tundish before pouring, no molten steel is exposed in the pouring process, N is strictly controlled to be absorbed at a water port, and the increase of N is controlled to be less than or equal to 4 ppm; high-alkalinity slag inclusion is adopted to facilitate the removal of inclusions in steel; the constant drawing speed is kept in the steel casting process; the control target of the continuous casting superheat degree is not more than 30 ℃;
5) heating in a furnace
The heating temperature is 1220-1260 ℃, and the heat preservation time is 30-40 minutes;
6) hot continuous rolling, rolling and coiling to obtain the steel plate
The rough rolling is controlled by selecting a 3+3 mode; the finishing temperature is as follows: more than or equal to 870 ℃; the coiling temperature is less than or equal to 500 ℃, and the cooling mode adopts a sixth group of opening cooling and intermittent cooling mode;
7) thermal treatment
Carrying out 850-950 ℃ oil quenching and 100-3500 ℃ tempering on the steel plate prepared in the step 6), wherein the metallographic structure is as follows: tempering martensite;
8) ERW pipe making
Performing ERW pipe making to obtain the target steel.
3. The method for producing a steel material for a worm gear according to claim 2, characterized in that: in the step 4), the soft reduction function is put into the steel casting process.
4. The method for producing a steel material for a worm gear according to claim 2, characterized in that: step 6), further comprising the steps of F1 and F2 post-machine small scale removal.
5. The method for producing a steel material for a worm gear according to claim 2, characterized in that: in the step 6), the finish rolling compression ratio is more than or equal to 4.0.
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