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Cold-rolled high-strength steel using bainite as matrix and preparation method of cold-rolled high-strength steel

A technology of high-strength steel and bainite, which is applied in the field of cold-rolled high-strength steel and its preparation, can solve problems such as impracticability, and achieve the effect of improving stability and improving mechanical properties

Inactive Publication Date: 2022-01-14
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This application provides a cold-rolled high-strength steel with bainite as the matrix and its preparation method to solve the technical problem in the prior art that the preparation process of high-strength steel strengthened by phase transformation induced plastic effect cannot be implemented on the traditional production line

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  • Cold-rolled high-strength steel using bainite as matrix and preparation method of cold-rolled high-strength steel
  • Cold-rolled high-strength steel using bainite as matrix and preparation method of cold-rolled high-strength steel
  • Cold-rolled high-strength steel using bainite as matrix and preparation method of cold-rolled high-strength steel

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Embodiment Construction

[0031] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

[0032] In one embodiment of the present application, a cold-rolled high-strength steel based on bainite is provided, and the cold-rolled high-strength steel includes, in terms of mass fractions: C: 0.13% to 0.18%, Si: 0.8% to 1.8% %, Mn: 2.0% to 2.5%, P≤0.01%, S≤0.01%, the balance is Fe and unavoidable impurities;

[0033] The metallog...

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Abstract

The invention relates to the field of metal materials, in particular to cold-rolled high-strength steel using bainite as a matrix and a preparation method of the cold-rolled high-strength steel. The cold-rolled high-strength steel comprises C, Si, Mn, P, S and the balance Fe and inevitable impurities. The metallographic structure of the cold-rolled high-strength steel comprises ferrite, bainite and retained austenite. The method comprises the following steps of: acquiring molten steel containing the chemical components; continuously casting the molten steel to obtain a plate blank; performing hot rolling and cold rolling on the plate blank to obtain cold-rolled strip steel; and continuously annealing the cold-rolled strip steel to obtain cold-rolled high-strength steel, wherein the continuous annealing comprises soaking, the soaking temperature is Ac<3> + / -30 DEG C, the time is 100 to 300 s, and Ac<3> represents the temperature of complete austenitizing of the cold-rolled strip steel. By controlling the chemical components of the cold-rolled steel, the stability of retained austenite is improved, and the temperature of complete austenitizing in the machining process does not exceed the upper limit of the heating capacity of a traditional cold rolling production line.

Description

technical field [0001] The application relates to the field of metal materials, in particular to a cold-rolled high-strength steel with bainite as a matrix and a preparation method thereof. Background technique [0002] In recent years, lightweight has become the mainstream of the development of the automobile industry. In order to reduce the weight of automobiles as much as possible under the premise of ensuring the strength and safety performance of automobiles, high-strength steel is widely used in automobile safety structural parts, and the commonly used automobile The steel used for safety structural parts is cold-rolled dual-phase steel, including DP590, DP780, DP980, etc. However, with the increase of strength, the plasticity and processability of DP steel become worse, which restricts the application range of high-strength DP steel. [0003] At present, high-strength steels strengthened by phase-transition-induced plasticity have attracted widespread attention. This ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C33/04C21D8/02C21D1/26
CPCC22C38/02C22C38/04C22C33/04C21D8/0205C21D8/0226C21D8/0236C21D8/0247C21D1/26C21D2211/005C21D2211/002C21D2211/001
Inventor 孙伟华胡宽辉祝洪川王俊霖陈一鸣李军
Owner 武汉钢铁有限公司
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