Zinc-plated steel sheet and manufacturing method thereof

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United States of America Patent

PATENT NO 11859259
APP PUB NO 20210155999A1
SERIAL NO

17047663

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Abstract

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A zinc-plated steel sheet includes a steel sheet having a predetermined chemical composition and a zinc-plated layer. In the steel sheet, steel microstructures in a range of ⅛ thickness to ⅜ thickness, having the center at ¼ thickness from a steel sheet surface, include, by vol %, ferrite: 0% to 10%, bainite: 0% to 30%, tempered martensite: 50% or more, fresh martensite: 0% to 10%, retained austenite: more than 10% and 30% or less, and pearlite: 0% to 5%. In the zinc-plated steel sheet, the amount of hydrogen emitted when the steel sheet is heated to 200° C. from room temperature after removal of the zinc-plated layer is 0.40 ppm or less per mass of the steel sheet, the tensile strength is 1470 MPa or more, and no cracking occurs in a U-shape bending test where a stress equivalent to 1000 MPa is applied for 24 hours.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATIONCHIYODA-KU TOKYO 100-8071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hayashi, Kunio Tokyo, JP 72 521
Nakata, Masahiro Tokyo, JP 104 917
Uchida, Satoshi Tokyo, JP 129 1270
Yamaguchi, Yuji Tokyo, JP 154 1195
Yokoyama, Takafumi Tokyo, JP 30 93

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