A 490MPa grade duplex steel outer plate and its production method

By using 490MPa grade duplex steel outer panels and employing specific chemical compositions and production processes, the problem of high strength and lightweight automotive outer body panels has been solved, achieving high strength and good formability, making it suitable for high-end automobile manufacturing.

CN116837285BActive Publication Date: 2026-01-30HEBEI DAHE MATERIAL TECH CO LTD +2
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Patent Information

Application Number
CN202310682023.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-09
Publication Date
2026-01-30
Estimated Expiration
2043-06-09

AI Technical Summary

Technical Problem

Existing automotive exterior panel materials are difficult to achieve high strength and lightweight, and traditional materials have limitations in terms of forming, joining and cost, which cannot meet the requirements of automotive lightweighting and safety performance.

Method used

Using 490MPa grade duplex steel outer plates, through specific chemical composition and production process design, combined with phase transformation strengthening technology, high strength and good formability are achieved, replacing traditional steel plate materials.

Benefits of technology

It achieves a strength increase of over 30% and a weight reduction of over 6KG for automotive exterior body panels, possesses excellent formability and surface quality, reduces production difficulty and cost, and is suitable for high-end automobile manufacturing.

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Abstract

This invention discloses a 490MPa grade duplex steel outer plate and its production method. Its chemical composition and mass percentage are as follows: C≤0.09%, Si≤0.08%, Mn: 1.40~1.60%, P: 0.010~0.030%, Al≤0.15%, Cr: 0.20~0.40%, V: 0.13~0.17%, B: 0.002~0.005%, with the balance being Fe and unavoidable impurities. The production method includes converter or electric furnace smelting, RH refining, continuous casting into billets, heating in a heating furnace, hot rolling, coiling, pickling, and hot-dip galvanizing. This duplex steel replaces traditional mild steels such as IF steel and BH steel, and is used to manufacture automotive, especially passenger car, door outer panels, engine hood outer panels, and fender outer panels. It possesses excellent dent resistance, flanging properties, formability, and high surface quality meeting O5 plate requirements, exhibiting superior overall performance.
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