PLATED STEEL SHEET

专利名称：PLATED STEEL SHEET发明人：Koutarou HAYASHI,Akihiro

UENISHI,Masaharu KAMEDA,Jun HAGA,KunioHAYASHI,Kohichi SANO,Hiroyuki KAWATA

申请号：US15567418申请日：20160422

公开号：US20180105908A1公开日：20180419

摘要：A base material () included in a plated steel sheet () includes a structure, at a ¼sheet thickness position, represented by, in volume fraction: tempered martensite: 3.0%or more; ferrite: 4.0% or more; and retained austenite: 5.0% or more. An averagehardness of the tempered martensite in the base material () is 5 GPa to 10 GPa, and apart or all of the tempered martensite and the retained austenite in the base materialform an M-A. A volume fraction of ferrite in a decarburized ferrite layer () included in theplated steel sheet () is 120% or more of the volume fraction of the ferrite in the basematerial () at the ¼ sheet thickness position, an average grain diameter of the ferrite inthe decarburized ferrite layer () is 20 μm or less, a thickness of the decarburized ferritelayer () is 5 μm to 200 μm, a volume fraction of tempered martensite in the decarburizedferrite layer () is 1.0 volume % or more, a number density of the tempered martensite inthe decarburized ferrite layer () is 0.01/μmor more, and an average hardness of thetempered martensite in the decarburized ferrite layer () is 8 GPa or less.

申请人：NIPPON STEEL & SUMITOMO METAL CORPORATION

地址：Tokyo JP

国籍：JP

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