Cold-rolled dual-phase sheet steel with 400MPa-level tensile strength and preparation method thereof

A technology with a tensile strength of 450mpa, which is applied in the field of steel materials, can solve the problems of adverse effects on formability and welding performance, increased production costs, and unfavorable stamping forming, so as to avoid wrinkling on the surface of parts, improve hardenability, and stamping forming good sex effect

Inactive Publication Date: 2013-09-18
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

This invention adds more noble metal elements Al, Mo, Nb, etc., which increases the production cost; at the same time, the C content is high, which has an adverse effect on the formability and weldability of the steel; and from the performance analysis obtained, its yield strength Relatively high, not good for stamping

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  • Cold-rolled dual-phase sheet steel with 400MPa-level tensile strength and preparation method thereof
  • Cold-rolled dual-phase sheet steel with 400MPa-level tensile strength and preparation method thereof
  • Cold-rolled dual-phase sheet steel with 400MPa-level tensile strength and preparation method thereof

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] like figure 1 As shown, the annealing process of the present invention includes six stages of heating section, heat preservation section, slow cooling section, fast cooling section, overaging section and natural cooling section; in the heating section, the steel plate is rapidly heated to the two-phase region to obtain a certain amount of During the heat preservation process of the heat preservation section, the carbides are further dissolved, and the alloy elements are enriched in the austenite, which improves the stability of the austenite; in the slow cooling section, part of the austenite transforms into ferrite , the alloy elements are further enriched in the untransformed austenite; the austenite transforms into martensite in the rapid cooling section; the martensite is tempered at low temperature during the overaging process, and the internal stress obtai...

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Abstract

The invention discloses a cold-rolled high-strength dual-phase sheet steel with 400MPa-level tensile strength for a car and a preparation method thereof, and belongs to the field of steel materials. The double-phase sheet steel adopts a ferrite-martensite dual-phase structure serving as the main structure and contains 4 to 9% of martensite and comprises the following chemical components by mass percent: 0.01 to 0.05% of C, 0.1 to 0.4% of Si, 1.2 to 1.6% of Mn, 0.1 to 0.4% of Cr, 0.02 to 0.05% of Als, not greater than 0.005% of N, not greater than 0.02% of P, not greater than 0.01% of S, and the balance of Fe and inevitable residual impurity elements. The preparation method comprises the steps of hot rolling, acid pickling, cold rolling and heat treating. The produced cold-rolled double-phase sheet steel has the yield strength of 200 to 250MPa, tensile strength of 400 to 450MPa and percentage of elongation of 30 to 35%.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and is a cold-rolled dual-phase steel for automobiles, in particular to a cold-rolled dual-phase steel plate with a tensile strength of 400MPa and a preparation method thereof. Background technique [0002] Reducing the weight of the car body by increasing the strength of the steel plate, achieving energy saving and reducing environmental pollution is an important topic in the research of today's automobile industry. Due to the low yield ratio, high initial work hardening rate, good aging stability, high impact energy absorption capacity, high bake hardening value, excellent welding performance, good strength and elongation of dual phase steel Excellent comprehensive performance such as performance matching, in the ULSAB project, has shown broad prospects in the application of body-in-white, which accounts for about 80% of the weight of the entire body, and is the development trend of stee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/38C22C33/04C21D8/02
Inventor 潘红波闫军章静沈晓辉曹杰王会廷
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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