Galvanized steel sheet for hot forming

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United States of America Patent

PATENT NO 9902135
APP PUB NO 20150314568A1
SERIAL NO

14417876

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Abstract

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A galvanized steel sheet for hot forming, the galvanized steel sheet including a galvanized film provided on a surface of a steel sheet,

    wherein the steel sheet has a chemical composition consisting of, in mass %,C: 0.02% to 0.58%,Mn: 0.5% to 3.0%,sol. Al: 0.005% to 1.0%,a predetermined element(s) as necessary;Si: less than or equal to 2.0%,P: less than or equal to 0.03%,S: less than or equal to 0.004%,N: less than or equal to 0.01%, andthe balance: Fe and impurities,wherein a content of Mn in a portion from an interface of the steel sheet and the galvanized film to a depth of 5 μm is more than or equal to 0.3 mass %,wherein the galvanized film has a plating coverage of 40 g/m2 to 110 g/m2, an Al content of more than or equal to 150 mg/m2 within the galvanized film, and an Al concentration of less than or equal to 0.5 mass %, andwherein the galvanized steel sheet is used for an application in which the galvanized steel sheet is heated to 700° C. or above and is then subjected to hot forming.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATION6-1 MARUNOUCHI 2-CHOME CHIYODA-KU TOKYO 100-8071

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Imai, Kazuhito Tokyo, JP 8 67
Nishibata, Hitomi Tokyo, JP 12 45
Takahashi, Hiroyuki Tokyo, JP 71 5

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