High-strength Zn—Al—Mg-based surface-coated steel sheet and method for producing same

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United States of America

PATENT NO 12227851
APP PUB NO 20200173004A1
SERIAL NO

16615955

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Abstract

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A high-strength surface-coated steel sheet includes a base steel sheet having a composition by mass of C: 0.01 to 0.20%, Si: 0.01 to 0.50%, Mn: 0.10 to 2.50%, P: 0.005 to 0.050%, B: 0.0005 to 0.010%, Ti: 0.01 to 0.20%, Nb: 0 to 0.10%, Mo: 0 to 0.50%, Cr: 0 to 0.50%, Al: 0.01 to 0.10%, and the balance of Fe and inevitable impurities; and a Zn—Al—Mg-based coating layer disposed on a surface of the base steel sheet, The steel sheet has a diffusible hydrogen concentration in the base steel sheet of 0.30 ppm or less and having a time until occurrence of red rust of 7000 hours or more as measured by a salt spray test. The high-strength hot-dip Zn—Al—Mg-based-plated steel sheet has a significantly lowered in-steel concentration of hydrogen which has entered the steel in a plating line and exhibits excellent corrosion resistance.

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Patent Owner(s)

  • NIPPON STEEL NISSHIN CO., LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fujiwara, Susumu Tokyo, JP 47 129
Shigetomi, Tomoharu Tokyo, JP 4 16
Uesugi, Shinya Tokyo, JP 3 4

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