High-strength galvanized steel sheet and method for manufacturing same

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United States of America Patent

PATENT NO 11408059
APP PUB NO 20200377978A1
SERIAL NO

16766398

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Abstract

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A high-strength galvanized steel sheet includes a steel sheet having a steel composition having a specific component composition, a steel structure containing martensite and bainite at more than or equal to 70% (including 100%), ferrite at less than 20% (including 0%), and retained austenite at less than 5% (including 0%) in terms of area ratio, the amount of diffusible hydrogen in steel being less than or equal to 0.20 mass ppm; and a galvanizing layer provided on a surface of the steel sheet, having a content amount of Fe of 8 to 15% in mass %, and having an coating weight per one surface of 20 to 120 g/m2, wherein the amount of Mn oxides contained in the galvanizing layer is less than or equal to 0.050 g/m2, and a tensile strength is more than or equal to 1100 MPa and a yield ratio is more than or equal to 0.85.

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Patent Owner(s)

Patent OwnerAddress
JFE STEEL CORPORATIONTOKYO 100-0011

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Koba, Masaki Tokyo, JP 17 34
Matsuda, Hiroshi Tokyo, JP 474 5592
Okita, Yasuaki Tokyo, JP 25 127
Ono, Yoshihiko Tokyo, JP 72 419
Yoshitomi, Hiromi Tokyo, JP 14 40

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