High-strength hot-dip galvanized steel sheet excel

专利名称：High-strength hot-dip galvanized steel

sheet excellent in impact resistance

property and high-strength alloyed hot-dipgalvanized steel sheet

发明人：Hiroyuki Kawata,Naoki Maruyama,Akinobu

Murasato,Akinobu Minami,Takeshi

Yasui,Takuya Kuwayama,Hiroyuki Ban,KaoruHiramatsu

申请号：US14348526申请日：20120928公开号：US08932729B2公开日：20150113

摘要：A base steel sheet has a hot-dip galvanized layer formed on a surface thereof,in which, in a steel sheet structure in a range of ⅛ thickness to ⅜ thickness centeredaround ¼ thickness of a sheet thickness from a surface, a volume fraction of a retainedaustenite phase is 5% or less, and a total volume fraction of phases of bainite, bainiticferrite, fresh martensite, and tempered martensite is 40% or more, an average effectivecrystal grain diameter is 5.0 μm or less, a maximum effective crystal grain diameter is 20μm or less, and a decarburized layer with a thickness of 0.01 μm to 10.0 μm is formed ona surface layer portion, in which a density of oxides dispersed in the decarburized layer is1.0×10to 1.0×10oxides/m, and an average grain diameter of the oxides is 500 nm or less.

申请人：Nippon Steel & Sumitomo Metal Corporation

地址：Tokyo JP

国籍：JP

代理机构：Birch, Stewart, Kolasch & Birch, LLP

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