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Annealing preparation process for enhancing product of strength and elongation of twinning-induced plasticity high-manganese steel board

A technology of twinning induced plasticity and preparation process, which is applied in the field of iron and steel material manufacturing, can solve the problems of inability to guarantee the total reduction rate of cold rolling, high annealing temperature, and large load of the rolling mill, and achieve the improvement of heat treatment process and rolling method, Improve the strength and plasticity, eliminate the effect of internal stress

Inactive Publication Date: 2012-04-18
UNIV OF SCI & TECH BEIJING
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  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an annealing preparation process for enhancing the twin-induced plasticity high-manganese steel plate strength and plasticity, to solve the process of preparing TWIP steel by traditional methods, especially in the single-pass rolling process that exists in the cold rolling process and heat treatment process The load of the rolling mill is too large, and it is difficult to ensure a reasonable total reduction rate of cold rolling and to provide a higher annealing temperature

Method used

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  • Annealing preparation process for enhancing product of strength and elongation of twinning-induced plasticity high-manganese steel board
  • Annealing preparation process for enhancing product of strength and elongation of twinning-induced plasticity high-manganese steel board

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Embodiment 1

[0025] The preparation steps of embodiment 1:

[0026] (1) Smelt according to the following composition (mass percentage): C: 0.56%, Si: ≤0.012%, Al: ≤0.1%, Mn: 22.5%, P: ≤0.1%, S: ≤0.02% , and the balance is iron or unavoidable impurities. In the designed chemical composition of Example 1, the contents of Al and Si are extremely low.

[0027] (2) Heat the billet to 1150±50°C for one hour, and forge it into a steel billet with a thickness of 80mm.

[0028] (3) Using rolling technology, carry out conventional hot rolling on the steel plate blank, wherein the hot rolling heating temperature is 1200±10°C, and start rolling after holding for 1 hour, and carry out multi-pass hot rolling, the starting rolling temperature is 1100°C, and the final rolling temperature is 1100°C. The rolling temperature was 900° C. to obtain a hot-rolled sheet having a thickness of 4.5 mm. Air-cool to room temperature after final rolling to obtain a hot-rolled sheet in use.

[0029] (4) The hot-ro...

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Abstract

The invention belongs to the field of metal material processing, and relates to an annealing preparation process for enhancing a product of strength and elongation of a twinning-induced plasticity (TWIP) high-manganese steel board. The high-manganese TWIP cold-rolled steel board comprises the following components in percentage by mass: 0.06-0.6% of C, not more than 3% of Si, not more than 3% of Al, 22-30% of Mn, not more than 0.1% of P, not more than 0.02% of S, and the balance of iron or inevitable impurities. The high-manganese TWIP cold-rolled steel board is prepared by the preparation steps of: smelting, carrying out die casting or continuous casting, hot rolling, cold rolling and heat treatment, carrying out heat insulation on the cold-rolled board in a heating furnace at 800-1000 DEG C for 0.1-0.5 hour, carrying out short-time heat treatment and rolling process multiple times, and carrying out air cooling to room temperature. According to the invention, by component and process control, the prepared material has superhigh strength and plasticity ratio, the tensile strength can reach 900-1020 MPa, the elongation can reach 70-80% and the strength and plasticity ratio can reach 80000 MPa.%; and the preparation process is simple and feasible as well as economical.

Description

technical field [0001] The invention relates to a method for manufacturing iron and steel materials, in particular to an annealing preparation process for twin crystal induced plasticity (TWIP) high manganese steel plate (TWIP). Background technique [0002] As a representative of advanced high-strength automotive sheet, TWIP steel sheet has high tensile strength, strong ductility, high stamping forming ability, can punch more complex parts, and has high impact absorption performance. Once a collision occurs, it will pass through itself. Deformation absorbs energy instead of transferring it outward. Due to its unique strengthening and toughening mechanism and high strength and toughness, it is recognized as a new generation of high-strength steel plates for automobiles. Parts that can be used to absorb collision energy in automobiles, such as bumpers and bumper ribs, impact beams, front and rear suspension supports, front and rear longitudinal beam steel plates, A-pillars, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D8/02
Inventor 米振莉靖海涛唐荻江海涛李志超吴彦欣杨顺利
Owner UNIV OF SCI & TECH BEIJING
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