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High-ductility steel with low yield ratio

A high-plasticity steel and low yield ratio technology, applied in the field of high-strength steel, can solve the problems of steel cold forming performance decline, yield ratio increase, etc., achieve stable production process, excellent comprehensive performance, and improve the effect of tensile strength

Inactive Publication Date: 2014-05-07
吴雪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase of the yield ratio will lead to a significant decrease in the cold formability of the steel

Method used

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  • High-ductility steel with low yield ratio

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Experimental program
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Effect test

Embodiment 1

[0010] A low yield ratio high plasticity steel, the chemical composition of the steel is calculated by weight percentage: C: 0.07%, Si: 0.18%, Mn: 1.30%, P: 0.008%, S: 0.004%, Ti: 0.011% , Cr: 0.10%, Ni: 0.15%, Cu: 0.20%, Al: 0.025%, and the balance is Fe and unavoidable impurities.

[0011] A rolling process of high plasticity steel with low yield ratio: adopting controlled rolling and controlled cooling process, heating temperature of continuous casting slab before rolling is 1180℃~1200℃; using austenite recrystallization zone and austenite non-recrystallization zone Two-stage controlled rolling, the reduction rate of each pass of rough rolling is 10-15%, the finishing temperature of rough rolling is 1000-1050℃, and the rough rolling is made into an intermediate billet with a thickness of 1.6-2.0 times the thickness of the finished product; the starting temperature of finishing rolling is 850- 870°C, the reduction rate of each pass is 10-15%, the finish rolling temperature i...

Embodiment 2

[0013] A low-yield ratio high-plasticity steel, the chemical composition of which is calculated by weight percentage: C: 0.09%, Si: 0.20%, Mn: 1.50%, P: 0.008%, S: 0.005%, Ti: 0.015% , Cr: 0.20%, Ni: 0.18%, Cu: 0.25%, Al: 0.030%, and the balance is Fe and unavoidable impurities.

[0014] Rolling process is the same as embodiment 1.

[0015] The mechanical property of embodiment 1 and 2 among the present invention is shown in Table 1:

[0016] Table 1

[0017]

[0018] The present invention improves the yield strength and tensile strength of the steel plate through microalloying and controlled rolling and controlled cooling, increases the probability of precipitate precipitation through two-phase zone quenching, obtains a uniform ultrafine grain ferrite structure, and makes the material have low yield strength Ratio, superplasticity, high strength and other characteristics. The production process is stable, the operability is strong, the cost is low, and the comprehensive...

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Abstract

The invention discloses a high-ductility steel with low yield ratio. The high-ductility steel comprises the following chemical ingredients in percentage by weight: 0.07-0.09% of C, 0.15-0.20% of Si, 1.30-1.50% of Mn, less than or equal to 0.008% of P, less than or equal to 0.004% of S, 0.010-0.015% of Ti, 0.10-0.20% of Cr, 0.15-0.20% of Ni, 0.20-0.25% of Cu, 0.025-0.030% of Al, and the balance of Fe and inevitable impurities. The high-ductility steel with low yield ratio adopts the controlled rolling and controlled cooling process to obtain a bainite structure. Due to the technology for heating processing, an ultra-fine grain structure is obtained, so that the material has the advantages of low yield ratio, superplasticity, high strength and the like.

Description

technical field [0001] The invention relates to a high-strength steel, specifically a low-yield ratio high-plasticity steel. Background technique [0002] With the development of society and economy, the iron and steel industry is facing three major pressures: saving resources, saving energy, and protecting the environment. Therefore, improving steel quality, reducing cost, and greatly improving its comprehensive mechanical properties have become the main direction of steel material research. [0003] Generally, the yield strength and tensile strength of steel are proportional to the -1 / 2 power of the grain diameter d, and grain refinement will significantly increase the yield strength and tensile strength of steel. The increase of the yield ratio will lead to a significant decrease in the cold formability of the steel. Therefore, high yield ratio and low plasticity are still difficult problems to be solved in the existing ultra-fine grain production technology. Contents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50
Inventor 吴雪
Owner 吴雪