Preparation method of high-strength medium-manganese steel plate

Abstract

The invention discloses a preparation method of a high-strength medium-manganese steel plate, and belongs to the technical field of steel plates with high strength and toughness. The preparation method comprises the following steps that 1), smelting is carried out according the proportion of the components in the high-strength medium-manganese steel plate, and continuous casting or die casting iscarried out, then forging is carried out to obtain a blank; 2), heating and heat preservation are carried out on the blank, and the blank is air-cooled to the room temperature after subjected to multi-pass hot rolling so as to obtain a hot-rolled plate or a hot-rolled coiled plate; 3), the hot-rolled plate or the hot-rolled coiled plate is heated, undergoes heat preservation and then is cooled toobtain a primary annealing steel plate, and the primary annealing steel plate undergoes a step 4) or directly undergoes a step 5); 4), the primary annealing steel plate is cold-rolled to obtain a cold-rolled plate; and 5), the cold-rolled plate or the primary annealing steel plate is heated, undergoes heat preservation and is cooled to the room temperature to obtain the high-strength medium-manganese steel plate, wherein the yield strength of the high-strength medium-manganese steel plate is 450-1000 MPa, the tensile strength of the high-strength medium-manganese steel plate is 800-1500 MPa, the elongation percentage of the high-strength medium-manganese steel plate is 18%-60%, no Luders bands are generated during the uniaxial tension process, and the yield elongation rate of the high-strength medium-manganese steel plate is less than or equal to 1%. The preparation method has the advantage that high strength and elongation of the steel plate can be guaranteed, the steel plate can be yielded continuously in the deformation process, and the Luders bands and deformation can be prevented from being generated so as to facilitate cold stamping forming of the steel plates.

Description

technical field [0001] The invention belongs to the technical field of high-strength and tough steel plates, and in particular provides a preparation method of high-strength medium-manganese steel plates. Background technique [0002] High strength and toughness have always been the goal of the development of steel materials. The use of high-strength and toughness materials can improve the safety of parts, and can reduce the amount of materials used on the premise of ensuring safety, and realize the weight reduction of parts. All automobile manufacturers are working hard Realize vehicle weight reduction. With the rapid development of my country's automobile industry, the problems of energy consumption and environmental pollution have become increasingly prominent. Although the application of new energy in automobiles has slowed down the problem of environmental pollution, it has put forward higher requirements for the lightweight of automobiles. Iron and steel materials are...

AI Technical Summary

Problems solved by technology

However, a large number of literature studies have shown that after reverse phase transformation annealing of severely cold-rolled medium-manganese steel, equiaxed ferrite and austenite structures are formed, and Lüders band deformation is easy to occur during the deformation process, without macroscopic work hardening, and Causes surface wrinkles of steel parts, which cannot meet the requirements of stamping and forming of automobile sheets

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