CN113930686A - Anti-seismic steel bar HRB400E-Cr and production method thereof - Google Patents
Anti-seismic steel bar HRB400E-Cr and production 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
- 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
- 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
- C21C7/06—Deoxidising, e.g. killing
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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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- 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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- 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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- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
Abstract
The invention relates to an anti-seismic steel bar HRB400E-Cr and a production method thereof, and steel ladle alloying: adding lime, a pre-deoxidizer and an iron alloy for deoxidation alloying when tapping 1/4-1/3, wherein the argon blowing time is more than or equal to 5 min; adding target amount of iron alloy: 13.0-14.4 kg/t of manganese silicon steel, 2.7-3.2 kg/t of silicon iron steel, 0.15-0.20 kg/t of aluminum iron steel, 1.8-2.0 kg/t of steel-making carburant, 4.0-4.6 kg/t of high-carbon ferrochrome steel and 0.22-0.25 kg/t of vanadium-nitrogen alloy; adding amount of auxiliary materials: 20-23 kg/t steel with lime, 14.0-17.0 kg/t steel with dolomite, and 18-20 kg/t steel with recycled iron. The advantages are that: the steel bar is produced by a vanadium-nitrogen alloy, chromium and nitrogen addition low microalloying process, so that the mechanical property and the anti-seismic property of the export anti-seismic steel bar are ensured, and the yield-strength ratio is stable.
Description
Technical Field
The invention relates to an anti-seismic steel bar HRB400E-Cr and a production method thereof.
Background
With the increasing demand of 400 MPa-level earthquake-resistant reinforcing steel bars, the high-strength-level earthquake-resistant reinforcing steel bars are required to have higher mechanical property and earthquake-resistant property, namely, when a building is impacted by earthquake waves, the time for breaking the building can be delayed, the building is prevented from instantaneously and integrally collapsing, and the earthquake-resistant property of the building is improved.
Domestic HRB400 Cr/HRB 400E-Cr production enterprises mostly adopt a water-through cooling process for production, but have the following problems:
1. the HRB400Cr strength-to-yield ratio can not meet the requirement of the anti-seismic steel bar strength-to-yield ratio: ReL is more than or equal to 1.25; the HRB400E-Cr steel bar is produced by a water-through cooling process, the yield ratio is low, the strength of the head and the tail is high, and the individual yield ratio is lower than 1.25. The iron oxide skin formed by the steel bar produced by the water cooling process is thin and not compact enough, the steel bar is easy to rust when meeting water or in marine environment, and the engineering life is short.
2. The national standard anti-seismic steel bar HRB400E mainly adopts a vanadium and niobium microalloying process, does not conform to export tax return conditions, and has high tax rate.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the anti-seismic steel bar HRB400E-Cr and the production method thereof, the low-microalloying process is adopted to produce the low-cost outlet anti-seismic steel bar HRB400E-Cr, the standard requirement of the anti-seismic steel bar is met, the yield-strength ratio control is stable, and the anti-seismic performance of the steel bar is good.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a production method of anti-seismic steel bars HRB400E-Cr comprises the following production process routes: blast furnace molten iron → molten iron pretreatment → converter smelting → ladle deoxidation, ladle alloying → argon station wire feeding and nitrogen increasing, argon station argon blowing and refining → square billet continuous casting → heating furnace heating → rolling → micro water penetration → cooling bed cooling → sizing and shearing → collection and bundling → inspection → warehousing;
alloying the steel ladle: adding lime, a pre-deoxidizer and an iron alloy for deoxidation alloying when tapping 1/4-1/3, wherein the argon blowing time is more than or equal to 5 min; adding target amount of iron alloy: 13.0-14.4 kg/t of manganese silicon steel, 2.7-3.2 kg/t of silicon iron steel, 0.15-0.20 kg/t of aluminum iron steel, 1.8-2.0 kg/t of steel-making carburant, 4.0-4.6 kg/t of high-carbon ferrochrome steel and 0.22-0.25 kg/t of vanadium-nitrogen alloy; adding amount of auxiliary materials: 20-23 kg/t steel with lime, 14.0-17.0 kg/t steel with dolomite, and 18-20 kg/t steel with recycled iron.
The converter smelting comprises the following steps: scrap steel accounts for 10 +/-1 percent, and molten iron accounts for 90 +/-1 percent; the smelting period is 26-32 min, the top and bottom oxygen blowing is carried out again, the oxygen blowing time is 13-17 min, and the oxygen blowing amount is 2100-2267 m3The tapping temperature is 1680-1700 ℃, the tapping end point C is 0.10-0.15 percent, P is less than or equal to 0.010 percent, and slag discharging is strictly forbidden.
The wire feeding and nitrogen increasing of the argon station and the argon blowing and refining of the argon station are as follows: the static argon blowing time is more than or equal to 10min, the temperature before treatment is 1660-1670 ℃, the temperature after treatment is 1640-1650 ℃, the wire feeding speed is 2.8-3.2 m/s, and the nitrogen-alloy-coated wire is fed with 1 kg-1.2 kg/t steel after the static argon blowing.
And (3) continuous casting of the square billet: the temperature of the tundish is 1560-1578 ℃, the superheat degree is kept at 20-30 ℃, and the pulling speed is 1.8-2.0 m/min; and (3) protecting casting in the continuous casting process of the square billet, wherein the crystallizer casting powder is medium-carbon steel casting powder.
The heating process of the heating furnace adopts two-section heating:
temperature control of the heating section: 1170-1280 ℃, temperature control of a soaking section: 1180-1250 ℃, rolling start temperature: 980-1100 ℃.
After rolling, micro water penetration cooling is carried out, and the tempering temperature is controlled at 940 +/-30 ℃.
An anti-seismic steel bar HRB400E-Cr comprises the following components in percentage by weight:
c: 0.21% -0.25%, Si: 0.40-0.50%, Mn: 1.00-1.20%, Cr: 0.30-0.40%, P is less than or equal to 0.040%, S is less than or equal to 0.040%, V: 0.025% -0.045%, N: 90ppm to 120ppm, the carbon equivalent Ceq is less than or equal to 0.54 percent, and the balance is Fe and inevitable impurities;
wherein, V is according to reinforcing bar specification: 0.025 to 0.037% for 10 to 14 mm; 16-22 mm is 0.028-0.040%; 25-32 mm is 0.030-0.045%; and adopting wire feeding to increase nitrogen.
The wire feeding nitrogen increasing adopts a core-spun yarn feeding mode to increase nitrogen, and core powder in the core-spun yarn comprises the following components in parts by weight: n: 22-27 parts of Si: 32-50 parts of Mn: 3-7 parts of Al: 3-7 parts, S: 0.01-0.15 parts of P: 0.01 to 0.15 portion.
The yield strength ReL of the anti-seismic steel bar HRB400E-Cr after pricking is more than or equal to 420MPa, the tensile strength is more than or equal to 560MPa, the maximum force total elongation is more than or equal to 9%, and the strength-to-yield ratio is more than or equal to 1.25.
Compared with the prior art, the invention has the beneficial effects that:
the anti-seismic steel bar HRB400E-Cr and the low-micro alloying process of vanadium-nitrogen alloy, chromium and nitrogen increase adopted by the production method are used for producing the economical low-cost export anti-seismic steel bar HRB400E-Cr, so that the mechanical property and the anti-seismic property of the export anti-seismic steel bar HRB400E-Cr are ensured, and the yield-strength ratio is stable; the corrosion resistance of the steel bar is improved while the anti-seismic performance is improved by adding Cr, the purity requirement of the steel can be ensured by adopting argon station refining after the furnace, the export tax return condition is met, the economic benefit of an enterprise is increased, and the enterprise competitiveness is improved. The addition of alloy is reduced through a nitrogen increasing process, the yield ratio is improved, alloy resources are saved, the heating temperature is reduced, the heating energy consumption is reduced, and the cost is reduced. The yield strength ReL of the anti-seismic steel bar HRB400E-Cr after pricking is more than or equal to 420MPa, the tensile strength is more than or equal to 560MPa, the maximum force total elongation is more than or equal to 9%, and the strength-to-yield ratio is more than or equal to 1.25; after natural aging, the yield strength ReL is more than or equal to 400MPa, the tensile strength is more than or equal to 540MPa, the maximum force total elongation is more than or equal to 9 percent, and the yield ratio is more than or equal to 1.25
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
Example 1
A production method of anti-seismic steel bars HRB400E-Cr comprises the following steps:
step 1: in the converter smelting process, 9 percent of scrap steel and 91 percent of molten iron are contained; the smelting period is 28min, oxygen top and bottom combined blowing is carried out, the oxygen blowing time is 15min, and the oxygen blowing amount is 2200m3Tapping temperature is 1685 ℃, tapping end point C: 0.12%, P: 0.008% without slag.
Step 2: deoxidizing the steel ladle, alloying the steel ladle, adding lime, a pre-deoxidizer and an iron alloy when tapping 1/4 to perform deoxidation alloying, and blowing argon for 8 min; adding target amount of iron alloy: 13.5kg/t of manganese-silicon steel, 2.8kg/t of ferrosilicon steel, 0.16kg/t of aluminum-iron steel, 1.8kg/t of steel-making carburant, 4.2kg/t of high-carbon ferrochrome steel and 0.23kg/t of vanadium-nitrogen alloy; adding amount of auxiliary materials: 22kg/t steel of lime, 14kg/t steel of dolomite and 18kg/t steel of recycled iron.
And step 3: feeding wire and increasing nitrogen in an argon station, blowing argon in the argon station for refining, statically blowing argon for 15min, wherein the temperature before treatment is 1660 ℃, the temperature after treatment is 1640 ℃, and statically blowing argon, then feeding nitrogen-enriched alloy cored wire 1kg/t steel, and the wire feeding speed is 2.8 m/s.
And 4, step 4: continuously casting the square billet, wherein the temperature of a tundish is 1560 ℃, the average superheat degree is kept at 22 ℃, and the drawing speed is 1.8 m/min; and (3) protecting casting in the continuous casting process of the square billet, wherein the crystallizer casting powder is medium-carbon steel casting powder.
And 5: heating, rolling, and controlling the temperature of a heating section: average 1180 ℃, temperature control of a soaking section: 1190 ℃, start rolling temperature: 990 ℃. After rolling, micro water penetration cooling is carried out, and the tempering temperature is controlled at 950 +/-5 ℃.
The compositions of the molten steel static argon blowing outlet station are shown in the following table 1, and the mechanical properties are shown in the following table 2;
TABLE 1 chemical composition
TABLE 2 mechanical Properties
| Categories | Yield strength ReL/MPa | Tensile strength Rm/MPa | Maximum force total elongation Agt% | Yield ratio R DEG m/RoeL | Scale ratio R degree m/ReL |
| 12mm | 460 | 619 | 15 | 1.352 | 1.15 |
Example 2
A production method of anti-seismic steel bars HRB400E-Cr comprises the following steps:
step 1: in the converter smelting process, the scrap steel accounts for 10 percent, and the molten iron accounts for 90 percent; the smelting period is 30min, the top and bottom oxygen blowing is carried out again, the oxygen blowing time is 15min, and the oxygen blowing amount is 2250m3Tapping temperature 1690 ℃, tapping end point C: 0.11%, P: 0.009%, no slag.
Step 2: deoxidizing the steel ladle, alloying the steel ladle, adding lime, a pre-deoxidizer and an iron alloy when tapping 1/4 to perform deoxidation alloying, and blowing argon for 8 min; adding target amount of iron alloy: 13kg/t of manganese-silicon steel, 2.9kg/t of ferrosilicon steel, 0.17kg/t of aluminum-iron steel, 1.8kg/t of steel-making carburant, 4.3kg/t of high-carbon ferrochrome steel and 0.24kg/t of vanadium-nitrogen alloy; adding amount of auxiliary materials: 21kg/t steel of lime, 15kg/t steel of dolomite and 19kg/t steel of return iron.
And step 3: feeding wire and increasing nitrogen in an argon station, blowing argon in the argon station for refining, statically blowing argon for 16min, wherein the temperature before treatment is 1670 ℃, the temperature after treatment is 1650 ℃, feeding 1.1kg/t steel of the nitrogen-enriched alloy cored wire after statically blowing argon, and the wire feeding speed is 2.8 m/s.
And 4, step 4: continuously casting the square billet, wherein the temperature of a tundish is 1565 ℃, the average superheat degree is kept at 23 ℃, and the drawing speed is 1.9 m/min; and (3) protecting casting in the continuous casting process of the square billet, wherein the crystallizer casting powder is medium-carbon steel casting powder.
And 5: heating, rolling, and controlling the temperature of a heating section: average 1185 ℃, temperature control of a soaking section: 1195 ℃, initial rolling temperature: 985 deg.C. After rolling, micro water penetration cooling is carried out, and the tempering temperature is controlled at 950 +/-5 ℃.
The compositions of the molten steel static argon blowing outlet station are shown in the following table 3, and the mechanical properties are shown in the table 4;
TABLE 3 chemical composition
TABLE 4 mechanical Properties
| Categories | Yield strength ReL/MPa | Tensile strength Rm/MPa | Maximum force total elongation Agt% | Yield ratio R DEG m/RoeL | A scale-yielding ratio R DEGm/ReL |
| 14mm | 447 | 605 | 16 | 1.35 | 1.12 |
Example 3
A production method of anti-seismic steel bars HRB400E-Cr comprises the following steps:
step 1: in the converter smelting process, 11 percent of scrap steel and 89 percent of molten iron are contained; the smelting period is 32min, the top and bottom oxygen blowing is carried out again, the oxygen blowing time is 16min, and the oxygen blowing amount is 2260m3Tapping temperature is 1685 ℃, tapping end point C: 0.12%, P: 0.008% without slag.
Step 2: deoxidizing the steel ladle, alloying the steel ladle, adding lime, a pre-deoxidizer and an iron alloy when tapping 1/4 to perform deoxidation alloying, and blowing argon for 8 min; adding target amount of iron alloy: 13.5kg/t of manganese-silicon steel, 3.0kg/t of ferrosilicon steel, 0.18kg/t of aluminum-iron steel, 1.8kg/t of steel-making carburant, 4.2kg/t of high-carbon ferrochrome steel and 0.23kg/t of vanadium-nitrogen alloy; adding amount of auxiliary materials: 22kg/t steel of lime, 15kg/t steel of dolomite and 18kg/t steel of recycled iron.
And step 3: feeding wire and increasing nitrogen in an argon station, blowing argon in the argon station for refining, statically blowing argon for 18min, wherein the temperature before treatment is 1660 ℃, the temperature after treatment is 1640 ℃, and statically blowing argon, then feeding nitrogen-enriched alloy cored wire 1.1kg/t steel, and the wire feeding speed is 2.8 m/s.
And 4, step 4: continuously casting the square billet at 1570 ℃ with the average superheat degree kept at 23 ℃ and the drawing speed of 1.8 m/min; and (3) protecting casting in the continuous casting process of the square billet, wherein the crystallizer casting powder is medium-carbon steel casting powder.
And 5: heating, rolling, and controlling the temperature of a heating section: average 1180 ℃, temperature control of a soaking section: 1190 ℃, start rolling temperature: 987 deg.C. After rolling, micro water penetration cooling is carried out, and the tempering temperature is controlled at 950 +/-5 ℃.
The compositions of the molten steel static argon blowing outlet station are shown in the following table 5, and the mechanical properties are shown in the following table 6;
TABLE 5 chemical composition
TABLE 6 mechanical Properties
| Categories | Yield strength ReL/MPa | Tensile strength Rm/MPa | Maximum force total elongation Agt% | Yield ratio R DEG m/RoeL | Scale ratio R degree m/ReL |
| 16mm | 458 | 618 | 15 | 1.36 | 1.145 |
Example 4
A production method of anti-seismic steel bars HRB400E-Cr comprises the following steps:
step 1: in the converter smelting process, the scrap steel accounts for 10 percent, and the molten iron accounts for 90 percent; the smelting period is 30min, the top and bottom oxygen blowing is carried out again, the oxygen blowing time is 17min, and the oxygen blowing amount is 2264m3Tapping temperature is 1683 ℃, tapping end point C: 0.11%, P: 0.009%, no slag.
Step 2: deoxidizing the steel ladle, alloying the steel ladle, adding lime, a pre-deoxidizer and an iron alloy when tapping 1/4 to perform deoxidation alloying, and blowing argon for 8 min; adding target amount of iron alloy: 13.4kg/t of manganese-silicon steel, 3.1kg/t of ferrosilicon steel, 0.19kg/t of aluminum-iron steel, 1.9kg/t of steel-making carburant, 4.1kg/t of high-carbon ferrochrome steel and 0.23kg/t of vanadium-nitrogen alloy; adding amount of auxiliary materials: 20kg/t steel of lime, 16kg/t steel of dolomite and 19kg/t steel of return iron.
And step 3: feeding wire and nitrogen in an argon station, blowing argon in the argon station for refining, wherein the static argon blowing time is 17min, the temperature before treatment is 1663 ℃, the temperature after treatment is 1644 ℃, feeding 1.2kg/t steel of the nitrogen-alloy-coated wire after static argon blowing, and the wire feeding speed is 2.8 m/s.
And 4, step 4: continuously casting the square billet at a tundish temperature of 1575 ℃, keeping the average superheat degree at 24 ℃ and a drawing speed of 1.9 m/min; and (3) protecting casting in the continuous casting process of the square billet, wherein the crystallizer casting powder is medium-carbon steel casting powder.
And 5: heating, rolling, and controlling the temperature of a heating section: average 1182 ℃, temperature control of a soaking section: 1193 ℃, initial rolling temperature: 986 deg.C. After rolling, micro water penetration cooling is carried out, and the tempering temperature is controlled at 950 +/-5 ℃.
The compositions of the molten steel static argon blowing outlet station are shown in the following table 7, and the mechanical properties are shown in the following table 8;
TABLE 7 chemical composition
TABLE 8 mechanical Properties
| Categories | Yield strength ReL/MPa | Tensile strength Rm/MPa | Maximum force total elongation Agt% | Yield ratio R DEG m/RoeL | Scale ratio R degree m/ReL |
| 16mm | 455 | 612 | 16 | 1.35 | 1.138 |
Example 5
A production method of anti-seismic steel bars HRB400E-Cr comprises the following steps:
step 1: in the converter smelting process, the scrap steel accounts for 10 percent, and the molten iron accounts for 90 percent; the smelting period is 29min, the top and bottom oxygen blowing is carried out again, the oxygen blowing time is 16min, and the oxygen blowing amount is 2267m3Tapping temperature is 1686 ℃, tapping end point C: 0.13%, P: 0.007% without slag.
Step 2: deoxidizing the steel ladle, alloying the steel ladle, adding lime, a pre-deoxidizer and an iron alloy when tapping 1/4 to perform deoxidation alloying, and blowing argon for 8 min; adding target amount of iron alloy: 13.6kg/t of manganese-silicon steel, 3.2kg/t of ferrosilicon steel, 0.20kg/t of aluminum-iron steel, 1.8kg/t of steel-making carburant, 4.0kg/t of high-carbon ferrochrome steel and 0.22kg/t of vanadium-nitrogen alloy; adding amount of auxiliary materials: 23kg/t steel of lime, 17kg/t steel of dolomite and 20kg/t steel of return iron.
And step 3: feeding wire and nitrogen in an argon station, blowing argon in the argon station for refining, statically blowing argon for 16min, wherein the temperature before treatment is 1666 ℃, the temperature after treatment is 1648 ℃, and statically blowing argon, then feeding 1.1kg/t of steel with the nitrogen-alloy-coated wire, and the wire feeding speed is 2.8 m/s.
And 4, step 4: continuously casting the square billet at a tundish temperature of 1578 ℃, keeping the average superheat degree at 25 ℃ and at a drawing speed of 2.0 m/min; and (3) protecting casting in the continuous casting process of the square billet, wherein the crystallizer casting powder is medium-carbon steel casting powder.
And 5: heating, rolling, and controlling the temperature of a heating section: average 1183 ℃, temperature control of a soaking section: 1195 ℃, initial rolling temperature: 988 deg.C. After rolling, micro water penetration cooling is carried out, and the tempering temperature is controlled at 950 +/-5 ℃.
The compositions of the molten steel static argon blowing outlet station are shown in the following table 9, and the mechanical properties are shown in the table 10;
TABLE 9 chemical composition
TABLE 10 mechanical Properties
| Categories | Yield strength ReL/MPa | Tensile strength Rm/MPa | Maximum force total elongation Agt% | Yield ratio R DEG m/RoeL | Scale ratio R degree m/ReL |
| 14mm | 446 | 606 | 14 | 1.355 | 1.115 |
。
Claims (9)
1. A production method of anti-seismic steel bars HRB400E-Cr comprises the following production process routes: blast furnace molten iron → molten iron pretreatment → converter smelting → ladle deoxidation, ladle alloying → argon station wire feeding and nitrogen increasing, argon station argon blowing and refining → square billet continuous casting → heating furnace heating → rolling → micro water penetration → cooling bed cooling → sizing and shearing → collection and bundling → inspection → warehousing;
the method is characterized in that the steel ladle alloying comprises the following steps: adding lime, a pre-deoxidizer and an iron alloy for deoxidation alloying when tapping 1/4-1/3, wherein the argon blowing time is more than or equal to 5 min; adding target amount of iron alloy: 13.0-14.4 kg/t of manganese silicon steel, 2.7-3.2 kg/t of silicon iron steel, 0.15-0.20 kg/t of aluminum iron steel, 1.8-2.0 kg/t of steel-making carburant, 4.0-4.6 kg/t of high-carbon ferrochrome steel and 0.22-0.25 kg/t of vanadium-nitrogen alloy; adding amount of auxiliary materials: 20-23 kg/t steel with lime, 14.0-17.0 kg/t steel with dolomite, and 18-20 kg/t steel with recycled iron.
2. The production method of an anti-seismic steel bar HRB400E-Cr according to claim 1, wherein the converter smelting comprises the following steps: scrap steel accounts for 10 +/-1 percent, and molten iron accounts for 90 +/-1 percent; the smelting period is 26-32 min, the top and bottom oxygen blowing is carried out again, the oxygen blowing time is 13-17 min, and the oxygen blowing amount is 2100-2267 m3The tapping temperature is 1680-1700 ℃, the tapping end point C is 0.10-0.15 percent, P is less than or equal to 0.010 percent, and slag discharging is strictly forbidden.
3. A production method of an anti-seismic steel bar HRB400E-Cr according to claim 1, wherein the argon station wire feeding and nitrogen increasing and argon station argon blowing refining: the static argon blowing time is more than or equal to 10min, the temperature before treatment is 1660-1670 ℃, the temperature after treatment is 1640-1650 ℃, the wire feeding speed is 2.8-3.2 m/s, and the nitrogen-alloy-coated wire is fed with 1 kg-1.2 kg/t steel after the static argon blowing.
4. A method for producing anti-seismic steel bars HRB400E-Cr according to claim 1, wherein the square billet is continuously cast: the temperature of the tundish is 1560-1578 ℃, the superheat degree is kept at 20-30 ℃, and the pulling speed is 1.8-2.0 m/min; and (3) protecting casting in the continuous casting process of the square billet, wherein the crystallizer casting powder is medium-carbon steel casting powder.
5. The method for producing anti-seismic steel bar HRB400E-Cr according to claim 1, wherein the heating process of the heating furnace adopts two-stage heating:
temperature control of the heating section: 1170-1280 ℃, temperature control of a soaking section: 1180-1250 ℃, rolling start temperature: 980-1100 ℃.
6. A production method of an anti-seismic steel bar HRB400E-Cr as claimed in claim 1, wherein the rolling is followed by micro-through water cooling, and the tempering temperature is controlled at 940 +/-30 ℃.
7. An anti-seismic steel bar HRB400E-Cr produced by the production method according to any one of claims 1 to 6, wherein the anti-seismic steel bar comprises the following components in percentage by weight:
c: 0.21% -0.25%, Si: 0.40-0.50%, Mn: 1.00-1.20%, Cr: 0.30-0.40%, P is less than or equal to 0.040%, S is less than or equal to 0.040%, V: 0.025% -0.045%, N: 90ppm to 120ppm, the carbon equivalent Ceq is less than or equal to 0.54 percent, and the balance is Fe and inevitable impurities;
wherein, V is according to reinforcing bar specification: 0.025 to 0.037% for 10 to 14 mm; 16-22 mm is 0.028-0.040%; 25-32 mm is 0.030-0.045%; and adopting wire feeding to increase nitrogen.
8. An anti-seismic steel bar HRB400E-Cr according to claim 7, wherein the wire feeding nitrogen increasing is nitrogen increasing by adopting a cored wire feeding mode, and the core powder in the cored wire comprises the following components in parts by weight: n: 22-27 parts of Si: 32-50 parts of Mn: 3-7 parts of Al: 3-7 parts, S: 0.01-0.15 parts of P: 0.01 to 0.15 portion.
9. An anti-seismic steel bar HRB400E-Cr according to claim 7, wherein the post-pricked yield strength ReL of the anti-seismic steel bar HRB400E-Cr is not less than 420MPa, the tensile strength is not less than 560MPa, the maximum force total elongation is not less than 9%, and the yield ratio is not less than 1.25.
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