Hot dip galvanized steel sheet and method for producing same

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United States of America

PATENT NO 12006562
SERIAL NO

17425234

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Abstract

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Provided are a hot dip galvanized steel sheet comprising a base steel sheet wherein the base steel sheet has a predetermined composition and contains ferrite: 0% to 50%, retained austenite: 0% to 30%, tempered martensite: 5% or more, fresh martensite: 0% to 10%, and pearlite and cementite in total: 0% to 5%, remaining structures consist of bainite, when defining a region having a hardness of 90% or less of the hardness at a position of ¼ thickness to the base steel sheet side from an interface of the base steel sheet and a hot dip galvanized layer as a “soft layer”, there is a soft layer having a thickness of 10 μm or more at the base steel sheet side from the interface, the soft layer contains tempered martensite, and an increase rate in a thickness direction of an area % of tempered martensite from the interface to the inside of the base steel sheet inside the soft layer is 5.0%/μm or less, and a method for producing the same.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL CORPORATIONTOKYO 100-8071

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hayashi, Kunio Tokyo, JP 72 521
Kawata, Hiroyuki Tokyo, JP 104 1026
Uchida, Satoshi Tokyo, JP 129 1270
Yamaguchi, Yuji Tokyo, JP 154 1195
Yokoyama, Takafumi Tokyo, JP 30 93

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