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Production of 32-40mmhrb400e fine-grained high-strength and toughness anti-seismic steel bars by niobium-chromium microalloying and its preparation method

一种微合金化、抗震钢筋的技术，应用在冶金领域，能够解决钒合金价格昂贵、不利钢筋企业生产成本产品市场竞争力、生产成本高等问题，达到淬透性和二次硬化作用提高、细晶强化效果显著、改善抗震性能的效果

Active Publication Date: 2021-05-14
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of vanadium alloy, the production cost is high, which is not conducive to the reduction of production cost of steel bar enterprises and the improvement of product market competitiveness
At present, there are no related patents and paper research reports on the preparation method of niobium-chromium microalloying to produce large-scale HRB400E fine-grained high-strength and tough seismic steel bars with a nominal diameter of 32-40mm

Method used

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  • Production of 32-40mmhrb400e fine-grained high-strength and toughness anti-seismic steel bars by niobium-chromium microalloying and its preparation method
  • Production of 32-40mmhrb400e fine-grained high-strength and toughness anti-seismic steel bars by niobium-chromium microalloying and its preparation method
  • Production of 32-40mmhrb400e fine-grained high-strength and toughness anti-seismic steel bars by niobium-chromium microalloying and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method of niobium-chromium micro-alloying of the present invention produces HRB400E fine-grained high-strength and toughness anti-seismic steel bars with a nominal diameter of 32-40mm, including molten steel smelting, deoxidizing alloy, refining of molten steel in argon station, molten steel casting, billet controlled rolling and controlled cooling, and specifically includes the following steps :

[0020] a. Molten steel smelting: 145~160kg / t respectively 钢, 10kg / t 钢 The cold material is charged into the proportion, and the chemical composition C is 0.12~0.20wt%, Si 0.17~0.30wt%, Mn 0.25~0.50wt%, P 0.028~0.042wt%, S 0.022~0.035wt%, and the rest is Fe and Unavoidable impurity steel scrap, chemical composition C 0.12~0.20wt%, Si 0.17~0.30wt%, Mn 0.25~0.50wt%, P 0.028~0.042wt%, S 0.022~0.035wt%, the rest is Fe and Pig iron with inevitable impurities is added to the LD converter, and then 910~920kg / t 钢 The loading ratio of the chemical composition is C 4....

Embodiment 1

[0038] a. Molten steel smelting: 145kg / t respectively 钢 , 10kg / t 钢 The cold material is charged into the proportion, and the steel scrap (chemical composition: C 0.12wt%, Si 0.17wt%, Mn 0.25wt%, P 0.028wt%, S 0.022wt% is added to the LD converter with the following mass ratio, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.1wt%, Si 0.20wt%, Mn 0.45wt%, P0.068wt%, S 0.024wt%, the rest is Fe and unavoidable impurities); Then press 920kg / t 钢 The proportion of molten iron is loaded into the LD converter with the following temperature and mass ratio of molten iron: molten iron temperature 1300 ° C, molten iron composition C 4.2wt%, Si0.20wt%, Mn 0.55wt%, P 0.105wt%, S 0.025wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the LD converter, then conventional top-bottom composite blowing is carried out, and conventional lime, lightly burned dolomite and magnesite balls are added to make slag...

Embodiment 2

[0052] a. Molten steel smelting: 150kg / t respectively 钢 , 10kg / t 钢 The cold material is loaded into the proportion, and the scrap steel (chemical composition: C 0.18wt%, Si 0.23wt%, Mn 0.38wt%, P 0.035wt%, S 0.029wt% is added in the LD converter, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.2wt%, Si 0.30wt%, Mn 0.62wt%, P0.075wt%, S 0.030wt%, the rest is Fe and unavoidable impurities); Then press 915kg / t 钢 The proportion of molten iron is loaded into the LD converter with the following temperature and mass ratio of molten iron: molten iron temperature 1310°C, molten iron composition C 4.4wt%, Si0.32wt%, Mn 0.67wt%, P 0.120wt%, S 0.030wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the LD converter, then conventional top-bottom composite blowing is carried out, and conventional lime, lightly burned dolomite and magnesite balls are added to make slag, and the amount of lime added is...

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Abstract

The invention discloses the production of 32-40mm HRB400E fine-grained high-strength and toughness anti-seismic steel bars by niobium-chromium micro-alloying and a preparation method thereof. Mn 0.95~1.15wt%, Cr 0.280‑0.350wt%, Nb 0.025~0.032wt%, S≤0.045wt%, P≤0.045wt%, N≤0.0090wt%, the rest is Fe and unavoidable impurities, Its preparation method includes molten steel smelting, deoxidized alloy, molten steel refining in argon station, molten steel casting, billet controlled rolling and controlled cooling process; the present invention adds ferro-niobium and ferrochrome to the steel and adopts appropriate post-rolling controlled cooling process to increase the Nb (C,N), Cr(C,N) and other carbonitride precipitation driving force, a large number of fine and dispersed second phases are precipitated on the matrix, grain boundaries and dislocation lines of the low-temperature ferrite region, making ferrite The body matrix is ​​strengthened, the strength of the steel is significantly improved, and the properties of welding and aging of the steel are improved at the same time; the process of the present invention has the characteristics of low production cost and strong process applicability, and the production cost is reduced by 50 yuan compared with the existing vanadium microalloying process / t 钢 above.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to the production of 32-40mm HRB400E fine-grained high-strength and tough anti-seismic steel bars by niobium-chromium microalloying and a preparation method thereof. Background technique [0002] After the implementation of the GB / T 1499.2-2018 standard, domestic manufacturers of hot-rolled ribbed steel bars basically adopt the vanadium microalloying process to produce straight ribbed steel bars. The microstructure and cross-section Vickers hardness meet the inspection requirements of the new standard. At present, there are domestic research reports on the production technology of HRB400E straight anti-seismic steel bars after the implementation of the GB / T 1499.2-2018 standard. The vanadium-nitrogen micro-alloying process is mainly used, and a certain amount of vanadium-nitrogen alloy or vanadium-iron nitride is added to the steel. The V content in large-scale HRB40...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/26C22C33/06C21C7/06C21C7/00C21D8/08
CPCC21C7/0006C21C7/06C21D8/065C21D8/08C21D2211/002C21D2211/005C21D2211/009C22C33/06C22C38/001C22C38/002C22C38/02C22C38/04C22C38/26Y02P10/20
Inventor 陈伟张卫强吴光耀郭继祥王文锋段鹏杰邓家木文玉兵胡威刘红兵朱艳红
Owner WUKUN STEEL
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