CN114855093A - High-cold-heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod and preparation method thereof - Google Patents
High-cold-heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C21C7/072—Treatment with gases
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- C22C33/04—Making ferrous alloys by melting
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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Abstract
The invention relates to a high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod and a preparation method thereof, belonging to the field of steel preparation. A high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod comprises the following alloy components: 0.19 to 0.24 percent of C, less than or equal to 0.07 percent of Si, 0.70 to 0.90 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.035 percent of Ni, less than or equal to 0.03 percent of Cr, less than or equal to 0.05 percent of Cu, 0.025 to 0.040 percent of Alt, and the balance of Fe. The finished product wire rod microstructure is ferrite and a small amount of pearlite, the grain size is 9-10 grade, the tensile strength is 460-510 MPa, and the reduction of area is not less than 50%. The alloy composition design of the invention ensures low cold deformation hardening rate of the hot rolled wire rod, good matching of strength, plasticity and toughness, difficult mixed crystal and good cold formability.
Description
Technical Field
The invention relates to a high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod and a preparation method thereof, belonging to the field of steel preparation.
Background
The low-carbon low-silicon aluminum-containing cold heading steel is used for manufacturing fasteners and connecting pieces, and is required to have better plasticity and cold processing performance, the contents of C, Si, Mn, P, S and Al are designed and comprehensively matched in different ways, and the tensile strength, yield strength, plasticity, toughness, deformation resistance and cold heading deformation capacity are greatly influenced. The conditions of recarburization, silicon increment and rephosphorization frequently occur in the smelting process of the low-carbon low-silicon cold forging steel, mixed crystals occur occasionally, severe surface cracking is easy to occur in the cold forging deformation process, the mechanical property and the technological property are not stable enough, and the product quality is seriously influenced. The main factors influencing the formability of the cold heading steel comprise the chemical composition, the surface quality, the purity, the grain size and the tissue state of the steel, the reasonable composition design and control are realized, and the key for obtaining high cold heading formability is the good surface quality, the purity, the grain size and the tissue state of the steel.
The existing similar materials and technologies, such as a production method of high-performance low-silicon cold heading steel and the like, of CN202011637191.4, cannot realize the preparation of hot-rolled wire rod products with good surface quality, purity, grain size, comprehensive mechanical properties and tissue state by adopting low alloy component design under a simple process route, and have insufficient cold heading formability.
Disclosure of Invention
The invention aims to provide a high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel QQGCH22A hot rolled wire rod and a preparation method thereof.
A high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod comprises the following alloy components: 0.19 to 0.24 percent of C, less than or equal to 0.07 percent of Si, 0.70 to 0.90 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.035 percent of Ni, less than or equal to 0.03 percent of Cr, less than or equal to 0.05 percent of Cu, 0.025 to 0.040 percent of Alt, and the balance of Fe.
The finished product wire rod microstructure is ferrite and a small amount of pearlite, the grain size is 9-10 grades, the tensile strength is 460-510 MPa, and the reduction of area is not less than 50%.
The high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod comprises the following chemical components: 0.19 to 0.24 percent of C, less than or equal to 0.07 percent of Si, 0.70 to 0.90 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.035 percent of Ni, less than or equal to 0.03 percent of Cr, less than or equal to 0.05 percent of Cu, 0.025 to 0.040 percent of Alt, and the balance of Fe.
The invention also aims to provide a preparation method of the high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod.
The preparation method of the high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod comprises the following steps of converter smelting, LF furnace refining, continuous casting, heating by a heating furnace and rolling in sequence, wherein the converter smelting comprises the following steps: the raw materials are molten iron and scrap steel, wherein the scrap steel accounts for 6-10%; oxygen top-bottom combined blowing is carried out, the tapping temperature is 1665-1685 ℃, the tapping end point C is more than or equal to 0.040 percent, P is less than or equal to 0.012 percent, and slag discharging is strictly forbidden; alloying a steel ladle, and adding 24-48 kg/t lime, 1.8-2.4 kg/t silicomanganese and 6-8 kg/t high-carbon ferromanganese in the tapping process; the smelting period is 40-50 min; and (3) statically blowing argon for 10-20 min, wherein the temperature before treatment is 1610-1630 ℃, the temperature after treatment is 1580-1600 ℃, and the pure calcium core-spun yarn is fed for 1-1.2 kg/t after statically blowing argon.
The invention relates to a preparation method of a high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod, wherein the LF furnace refining comprises the following steps: the arrival temperature is 1570-1590 ℃, 6-8.5 kg/t of active lime and 0.70-0.85 kg/t of fluorite are added to make white slag, 0.2-0.47 kg/t of calcium carbide is added to adjust the alkalinity and the fluidity of the slag, the LF refining time is 65-85 min, and 1.3-1.5 kg/t of aluminum particles are added to carry out precipitation deoxidation; according to the full analysis result, the chemical components are finely adjusted by using a carburant, silicomanganese and medium carbon ferromanganese, so that the requirement of internal control is met: 0.20-0.23% of C, less than or equal to 0.06% of Si, 0.72-0.85% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, less than or equal to 0.030% of Ni, less than or equal to 0.03% of Cr, less than or equal to 0.03% of Cu, and 0.028-0.038% of Alt; and (4) statically blowing argon for 12-20 min, and feeding 0.2-0.3 kg/t of aluminum wire for final deoxidation.
The invention relates to a preparation method of a high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod, which comprises the following steps of: the electromagnetic stirring of the crystallizer adopts a positive and negative rotation alternate rotation mode, the current is 280A, the frequency is 5Hz, the positive rotation is 6s, the stop is 6s, the reverse rotation is 6s, the superheat degree is kept at 35-45 ℃, and the pulling speed is 2.2-2.6 m/min; the whole process is casting-protected, and the crystallizer casting powder is medium-carbon steel casting powder.
The invention relates to a preparation method of a high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod, which comprises the following steps of: heating by adopting a steel pushing type heating furnace, wherein the temperature of a preheating section is 880 +/-30 ℃, and the time is 60-80 min; heating at 1100 +/-30 ℃ for 60-80 min; the soaking section is 1150 +/-30 ℃ and the time is 30-50 min; the total heating time is 2.5-3.5 h.
The invention relates to a preparation method of a high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod, which comprises the following steps: rough rolling temperature: 980 +/-10 ℃; finish rolling inlet temperature: 870 plus or minus 10 ℃; spinning temperature: 870 plus or minus 10 ℃; adjusting the cooling speed of the wire by jointly using the air cooling roller way and the heat preservation cover, setting the speed of the head roller way to be 0.09-0.12 m/s, adjusting the length of a heat preservation channel, and controlling the cooling speed to be 0.95-1.05 ℃/s; and removing phosphorus and iron scales by adopting high-pressure water in front of the machine, wherein the water pressure is more than or equal to 14 MPa.
The preparation method of the high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod further comprises the conventional steps of preparing steel, such as the steps of pretreatment (S removal and slag removal) of blast furnace molten iron and molten iron before the converter smelting step; after rolling and spinning, the process steps of checking, coil collecting, heat preservation channel slow cooling, checking, packaging and warehouse exchanging and the like are included, and the process steps are carried out according to a mode disclosed by the prior art to meet the process requirements.
The invention has the beneficial effects that:
1. the alloy composition design of low carbon, low silicon, aluminum and manganese ensures that the cold deformation hardening rate of the hot rolled wire rod is low, the matching of the strength, the plasticity and the toughness is good, the mixed crystal is not easy to occur, and the cold formability is good.
2. The hot-rolled wire rod produced by the preparation method has the size precision reaching B + in GB/T14981, good removal of the oxide scale on the surface in the process, reasonable structure and thickness of the oxide scale of the finished product, effective mechanical dephosphorization before wire drawing, uniform metallographic structure of the finished product, fine grain size, no mixed crystal, moderate strength, good toughness and plasticity.
3. The cold heading ratio of the hot-rolled wire rod metal product in the production process reaches 1/4, and the cold heading formability is good.
Drawings
FIG. 1 is a transverse metallographic structure photograph of a high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled QQGCH22A wire rod. As can be seen from the figure, the metallographic structure of the finished product wire rod is ferrite and a small amount of pearlite structure, the structure is uniform and compact, and the grain size is 9.5 grade.
Detailed Description
The following non-limiting examples will allow one of ordinary skill in the art to more fully understand the present invention, but will not limit the invention in any way.
The test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
One of the specific implementation modes is as follows:
a high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod comprises:
design of chemical components
The chemical composition of the hot-rolled wire rod QQGCH22A is designed as follows: 0.19 to 0.24 percent of C, less than or equal to 0.07 percent of Si, 0.70 to 0.90 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.035 percent of Ni, less than or equal to 0.03 percent of Cr, less than or equal to 0.05 percent of Cu, 0.025 to 0.040 percent of Alt, and the balance of Fe
The high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod disclosed by the invention has the following component design principles:
the content of C has great influence on the comprehensive mechanical property of the cold heading steel, the content of C is high, the tensile strength and the yield strength are high, the plasticity and the toughness are correspondingly lower, the deformation resistance is increased, and the cold heading deformation capability is low, so that the range of the content of C in the cold heading steel is reasonably designed and is ensured to fluctuate in a narrow range to obtain better cold heading property.
Si can improve the tensile strength, yield strength and hardness of the cold heading steel and reduce the plasticity and toughness, but Si content is increased, the strength and hardness are improved, the plasticity and toughness are reduced, the deformation resistance is increased, the cold heading deformability is reduced, the amount of C, D inclusions in the steel is increased, cold heading cracking is caused during cold heading deformation, and therefore the Si content is controlled to be lower.
Mn can improve the strength of steel, reduce the ductility and toughness of the steel, and Mn with proper content can not cause great influence on cold heading performance, but the Mn content is higher, and cold heading forming is more difficult.
P reduces the plasticity of the steel, easily causes cold brittleness and fracture, can promote delayed fracture in the cold forging steel, and the lower the content is, the better the content is.
S is partially gathered in the form of sulfide in the steel at the grain boundary, and the cold heading performance is reduced. In the production process of aluminum-containing cold forging steel, a water gap is easy to block, and the strength of a standard part is reduced due to the existence of the water gap, so that the S content is strictly controlled, and the lower the S content is, the better the S content is.
Al is used as a strong deoxidizer, is matched with calcium treatment to deeply deoxidize and control the content and the size of inclusions, and simultaneously, the grains are refined, and the drawing and cold heading performances are improved.
Second, preparation method
1. The process comprises the following steps: blast furnace molten iron → molten iron pretreatment (S removal and slag removal) → converter (top-bottom combined blowing) → LF furnace refining → billet continuous casting (150 mm. times.150 mm) → heating furnace heating → wire rod rolling → spinning → inspection → coil collection → heat preservation channel slow cooling → inspection → packaging transportation warehouse
2. Key process
Smelting in a converter: the raw materials are molten iron and scrap steel, wherein the scrap steel accounts for 6-10%; oxygen top-bottom combined blowing is carried out, the tapping temperature is 1665-1685 ℃, the tapping end point C is more than or equal to 0.040 percent, P is less than or equal to 0.012 percent, and slag discharging is strictly forbidden; alloying a steel ladle, and adding 24-48 kg/t lime, 1.8-2.4 kg/t silicomanganese and 6-8 kg/t high-carbon ferromanganese in the tapping process; the smelting period is 40-50 min; and (3) statically blowing argon for 10-20 min, wherein the temperature before treatment is 1610-1630 ℃, the temperature after treatment is 1580-1600 ℃, and after statically blowing argon, feeding 1-1.2 kg/t of pure calcium cored wires.
Refining in an LF furnace: the arrival temperature is 1570-1590 ℃, 6-8.5 kg/t of active lime and 0.70-0.85 kg/t of fluorite are added to make white slag, 0.2-0.47 kg/t of calcium carbide is added to adjust the alkalinity and the fluidity of the slag, the LF refining time is 65-85 min, and 1.3-1.5 kg/t of aluminum particles are added to carry out precipitation deoxidation; according to the full analysis result, the chemical components are finely adjusted by using a carburant, silicomanganese and medium carbon ferromanganese, so that the requirement of internal control is met: 0.20-0.23% of C, less than or equal to 0.06% of Si, 0.72-0.85% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, less than or equal to 0.030% of Ni, less than or equal to 0.03% of Cr, less than or equal to 0.03% of Cu, and 0.028-0.038% of Alt; and (4) statically blowing argon for 12-20 min, and feeding 0.2-0.3 kg/t of aluminum wire for final deoxidation.
Continuous casting: the crystallizer adopts a positive and negative rotation alternating rotation mode for electromagnetic stirring, the current is 280A, the frequency is 5Hz, the positive rotation is 6s, the stop is 6s, the reverse rotation is 6s, the superheat degree is kept at 35-45 ℃, and the pulling speed is 2.2-2.6 m/min; the whole process is casting-protected, and the crystallizer casting powder is medium-carbon steel casting powder.
A heating process: heating by adopting a steel pushing type heating furnace, wherein the temperature of a preheating section is 880 +/-30 ℃, and the time is 60-80 min; heating at 1100 +/-30 ℃ for 60-80 min; the soaking section is 1150 +/-30 ℃ and the time is 30-50 min; the total heating time is 2.5-3.5 h.
The rolling process comprises the following steps: rough rolling temperature: 980 +/-10 ℃; finish rolling inlet temperature: 870 plus or minus 10 ℃; spinning temperature: 870 plus or minus 10 ℃; adjusting the cooling speed of the wire by jointly using the air cooling roller way and the heat preservation cover, setting the speed of the head roller way to be 0.09-0.12 m/s, properly adjusting the length of the heat preservation channel, and controlling the cooling speed to be 0.95-1.05 ℃/s; and removing phosphorus and iron scale by adopting high-pressure water in front of the machine, wherein the water pressure is more than or equal to 14 MPa.
The microstructure of the finished product wire rod is controlled to be ferrite and a small amount of pearlite, the grain size is 9-10 grade, the tensile strength is not more than 460-510 MPa, and the reduction of area is not less than 50%.
The preparation method adopts blast furnace molten iron → molten iron pretreatment (S removal and slag removal) → converter (top and bottom combined blowing) → LF furnace refining → billet continuous casting (150mm multiplied by 150mm) → heating of a heating furnace → wire rod rolling → wire laying → inspection → coil collection → heat preservation channel slow cooling → inspection → packaging and warehouse-crossing process route, and the QGCH22A steel hot rolled wire rod is produced and manufactured, so that the comprehensive mechanical property requirements of strength, toughness and the like are met, the steel purity is high, the crystal grains are fine, the structure is uniform, the surface quality is good, the drawing processing performance and the cold heading formability are good, and the cold heading ratio reaches 1/4.
Example 1
The best implementation case for manufacturing the high cold heading formability hot rolled wire rod QQGCH22A by adopting the technical scheme of the invention has the following chemical components, and the balance of Fe:
％
| smelting number | C | Si | Mn | P | S | Cr | Ni | Cu | Alt |
| 2E21634 | 0.23 | 0.06 | 0.79 | 0.014 | 0.008 | 0.0297 | 0.0109 | 0.0105 | 0.036 |
The specific implementation production steps are as follows:
1. smelting in a converter
151t of raw material molten iron, 14.6t of scrap steel, and 8.82% of scrap steel; oxygen top-bottom combined blowing is carried out, the tapping temperature is 1684 ℃, and the tapping terminal point C: 0.116%, P: 0.011 percent, strictly forbidding slag discharging; alloying a steel ladle, and adding 6808kg of lime, 359kg of silicomanganese and 1162kg of high-carbon ferromanganese in the tapping process; the smelting period is 41 min; the static argon blowing time is 14min, the temperature before treatment is 1625 ℃, the temperature after treatment is 1592 ℃, and 172kg of pure calcium core-spun yarn is fed after the static argon blowing.
2. Refining in LF furnace
The arrival temperature is 1575 ℃, active lime 1113kg and fluorite 115kg of white making slag are added, and 60kg of calcium carbide is added to adjust the alkalinity and the fluidity of the slag; LF refining time is 82min, 202kg of aluminum particles are added for precipitation and deoxidation; according to the full analysis result, 30kg of carburant and 80kg of medium carbon ferromanganese are added to finely adjust chemical components, so that the requirement of internal control is met: 0.20-0.23% of C, less than or equal to 0.06% of Si, 0.72-0.85% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, less than or equal to 0.030% of Ni, less than or equal to 0.03% of Cr, less than or equal to 0.03% of Cu, and 0.028-0.038% of Alt; static argon blowing time is 12-20 min; and (4) statically blowing argon for 14min, and feeding 38kg of aluminum wire for final deoxidation.
3. Continuous casting
The electromagnetic stirring of the crystallizer adopts a positive and negative rotation alternate rotation mode, the current is 280A, the frequency is 5Hz, the positive rotation is 6s, the stop is 3s, and the reverse rotation is 6 s. The degree of superheat is kept at 38 ℃ and the pulling speed is 2.5 m/min. The whole process is casting-protected, and the crystallizer casting powder is medium-carbon steel casting powder.
4. Heating process
Heating by a steel pushing type heating furnace, wherein the temperature of a preheating section is 900 ℃, the time is 70min, the temperature of a heating section is 1080 ℃, the time is 70min, the temperature of a soaking section is 1130 ℃, the time is 40min, and the total heating time is 3 h.
5. Rolling process
The specification of the product is phi 6.5mm, the rough rolling temperature is 990 ℃, the finish rolling inlet temperature is 880 ℃, the spinning temperature is: 880 ℃; the speed of the wire rod cooling speed and air cooling roller way is adjusted by jointly using the air cooling roller way and the heat preservation cover, the speed of the head roller way is set to be 0.12m/s, the heat preservation cover 1 and the heat preservation cover 2 are closed, the rest of the heat preservation cover are opened, the cooling speed is controlled to be 1.0 ℃/s, and the dephosphorization treatment is carried out under the condition that the water pressure of high pressure water in front of the machine is 15 MPa.
6. Performance of the finished product
The finished wire rod has tensile strength of 498MPa, reduction of area of 64 percent, a microstructure of ferrite and a small amount of pearlite and a grain size of 9.5 grade.
The preparation method of the high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod further comprises the conventional steps of preparing steel, such as the steps of pretreatment (S removal and slag removal) of blast furnace molten iron and molten iron before the converter smelting step; after rolling and spinning, the process steps of checking, coil collecting, heat preservation channel slow cooling, checking, packaging and warehouse exchanging and the like are included, and the process steps are carried out according to a mode disclosed by the prior art to meet the process requirements.
Claims (7)
1. A high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod is characterized in that: the high cold heading formability low-carbon low-silicon aluminum-containing cold heading steel hot rolled wire rod comprises the following alloy components: 0.19 to 0.24 percent of C, less than or equal to 0.07 percent of Si, 0.70 to 0.90 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.035 percent of Ni, less than or equal to 0.03 percent of Cr, less than or equal to 0.05 percent of Cu, 0.025 to 0.040 percent of Alt, and the balance of Fe.
2. The high cold heading formability low carbon low silicon aluminum containing cold heading steel hot rolled wire rod according to claim 1, wherein: the finished product wire rod microstructure is ferrite and a small amount of pearlite, the grain size is 9-10 grade, the tensile strength is 460-510 MPa, and the reduction of area is not less than 50%.
3. The method for preparing the high cold heading formability low carbon low silicon aluminum-containing cold heading steel hot rolled wire rod as claimed in claim 1, which is characterized in that: the process sequentially comprises the steps of converter smelting, LF furnace refining, continuous casting, heating by a heating furnace and rolling, wherein the converter smelting comprises the following steps: the raw materials are molten iron and scrap steel, wherein the scrap steel accounts for 6-10%; oxygen top-bottom combined blowing is carried out, the tapping temperature is 1665-1685 ℃, the tapping end point C is more than or equal to 0.040 percent, P is less than or equal to 0.012 percent, and slag discharging is strictly forbidden; alloying a steel ladle, and adding 24-48 kg/t lime, 1.8-2.4 kg/t silicomanganese and 6-8 kg/t high-carbon ferromanganese in the tapping process; the smelting period is 40-50 min; and (3) statically blowing argon for 10-20 min, wherein the temperature before treatment is 1610-1630 ℃, the temperature after treatment is 1580-1600 ℃, and the pure calcium core-spun yarn is fed for 1-1.2 kg/t after statically blowing argon.
4. The method of claim 3, wherein: the LF furnace refining comprises the following steps: the arrival temperature is 1570-1590 ℃, 6-8.5 kg/t of active lime and 0.70-0.85 kg/t of fluorite are added to make white slag, 0.2-0.47 kg/t of calcium carbide is added to adjust the alkalinity and the fluidity of the slag, the LF refining time is 65-85 min, and 1.3-1.5 kg/t of aluminum particles are added to carry out precipitation deoxidation; according to the full analysis result, the chemical components are finely adjusted by using a carburant, silicomanganese and medium carbon ferromanganese, so that the requirement of internal control is met: 0.20-0.23% of C, less than or equal to 0.06% of Si, 0.72-0.85% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, less than or equal to 0.030% of Ni, less than or equal to 0.03% of Cr, less than or equal to 0.03% of Cu, and 0.028-0.038% of Alt; and (4) statically blowing argon for 12-20 min, and feeding 0.2-0.3 kg/t of aluminum wire for final deoxidation.
5. The method of claim 3, wherein: the continuous casting comprises the following steps: the electromagnetic stirring of the crystallizer adopts a positive and negative rotation alternate rotation mode, the current is 280A, the frequency is 5Hz, the positive rotation is 6s, the stop is 3s, the reverse rotation is 6s, the superheat degree is kept at 35-45 ℃, and the pulling speed is 2.2-2.6 m/min; the whole process is casting-protected, and the crystallizer casting powder is medium-carbon steel casting powder.
6. The method of claim 3, wherein: the heating of the heating furnace is as follows: heating by adopting a steel pushing type heating furnace, wherein the temperature of a preheating section is 880 +/-30 ℃, and the time is 60-80 min; heating at 1100 +/-30 ℃ for 60-80 min; the soaking section is 1150 +/-30 ℃ and the time is 30-50 min; the total heating time is 2.5-3.5 h.
7. The method of claim 3, wherein: the rolling process comprises the following steps: rough rolling temperature: 980 +/-10 ℃; finish rolling inlet temperature: 870 plus or minus 10 ℃; spinning temperature: 870 plus or minus 10 ℃; adjusting the cooling speed of the wire by jointly using the air cooling roller way and the heat preservation cover, setting the speed of the head roller way to be 0.09-0.12 m/s, adjusting the length of a heat preservation channel, and controlling the cooling speed to be 0.95-1.05 ℃/s; high-pressure water is adopted to remove scales and scale in front of the machine, and the water pressure is more than or equal to 14 MPa.
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