A normalized dual-phase cold-formed steel and its production method and application

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By using normalized duplex cold forming steel with a single alloy composition and adjusting the tensile strength through annealing treatment, the problems of high production difficulty and complex welding process in body white manufacturing are solved, and efficient production of strength and plastic matching is achieved.

CN119753509APending Publication Date: 2025-04-04BEIJING CHEHEJIA AUTOMOBILE TECH CO LTD

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Patent Information

Application Number: CN202510018828.8
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2025-01-06
Publication Date: 2025-04-04

Application Information

Patent Timeline

06 Jan 2025

Application

CN202510018828.8

04 Apr 2025

Publication

CN119753509A

IPC: C22C38/02; C22C38/04; C22C38/06; C22C38/38; C22C38/26; C22C38/24; C21D8/02; C21D1/26; B62D29/00

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Superstructures

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AI Technical Summary

Technical Problem

In the manufacture of body white DP steel, due to the different chemical compositions corresponding to different strength levels, the production difficulty is difficult, material recycling is difficult and the welding process is complex.

Method used

Normalized duplex cold-formed steel with a single alloy composition is used to adjust its tensile strength range through annealing treatment, from 500MPa to 1250MPa, covering the needs of different strength levels.

Benefits of technology

DP steels of different tensile strength levels are achieved in a single alloy composition, which simplifies the production process, reduces the difficulty of material recycling, and simplifies the welding process, with good elongation and strength matching.

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Abstract

The present invention provides a normalized dual-phase cold-formed steel. Compared with the prior art, the normalized dual-phase cold-formed steel provided by the present invention can obtain different tensile strengths with a single alloy component, covering the strength of typical commercial similar products, while showing good elongation. When used to prepare a body-in-white, it can reduce the resistivity difference within the sheet stack, thereby simplifying the welding process, and may revolutionize the body-in-white manufacturing of the global automotive industry and contribute to carbon neutrality.

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