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

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, ...

AI Technical Summary

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

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