Highly-thermoplastic high-manganese and high-aluminum TWIP steel and production method thereof

Abstract

The invention discloses highly-thermoplastic high-manganese and high-aluminum TWIP steel and a production method thereof. The highly-thermoplastic high-manganese and high-aluminum TWIP steel is prepared from the following chemical components in percentage by mass: 0.3 to 0.8 percent of C, 1 to 3 percent of Si, 16 to 25 percent of Mn, 0.001 to 0.008 percent of P, 0.001 to 0.008 percent of S, 1 to 3 percent of Al, 0.002 to 0.009 percent of N, 0.06 to 0.1 percent Nb and / or 0.2 to 0.4 percent of Mo, and the balance of Fe and other inevitable trace elements. According to the TWIP steel, Nb and / or Mo are / is added into the steel, so that the thermoplasticity of the steel is improved. The precipitation of aluminum nitride at the grain boundary of the steel can be reduced, the occurrence rate of dynamic recrystallization of the steel is increased, the thermoplasticity of the high-manganese and high-aluminum TWIP steel for automobiles is remarkably improved, and the tensile strength of the steel is improved, so that the problems of surface defects, cracks and the like in the hot working process are solved.

Description

technical field [0001] The invention relates to a high-manganese-high-aluminum TWIP steel, in particular to a high-thermoplastic high-manganese-high-aluminum TWIP steel and a production method thereof. Background technique [0002] High manganese and high aluminum TWIP steel is also called twin-induced plasticity steel. It has a single austenite structure at room temperature and an annealed twin structure before deformation. Twins are formed during deformation, resulting in excellent plasticity. The strength and plasticity of high manganese and high aluminum TWIP steel can reach more than 50GPa·%, which is an ideal automobile steel integrating high strength and high plasticity. For example, the body and chassis used to make a car can reduce the weight of the car by more than 20%, which can significantly reduce fuel consumption, enhance anti-collision safety, and play a role in energy saving and emission reduction. High manganese and high aluminum TWIP steel is considered to...

AI Technical Summary

Problems solved by technology

The rare earths added by this method are extremely active in the steelmaking process, the yield is low, and the effect stability is poor, and the target steel type is austenitic stainless steel, which cannot directly guide the improvement of the thermoplasticity of high manganese and high aluminum TWIP steel

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