- Patent Title: Hot-dip galvanized steel sheets and galvannealed steel sheets that have good appearance and adhesion to coating and methods for producing the same (as amended)
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Application No.: US15021518Application Date: 2014-09-11
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Publication No.: US09932659B2Publication Date: 2018-04-03
- Inventor: Minoru Tanaka , Yoshitsugu Suzuki , Yasunobu Nagataki
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: RatnerPrestia
- Priority: JP2013-188920 20130912
- International Application: PCT/JP2014/004700 WO 20140911
- International Announcement: WO2015/037241 WO 20150319
- Main IPC: C22C38/34
- IPC: C22C38/34 ; C23C2/02 ; C23C2/06 ; C23C2/28 ; C22C18/04 ; C22C38/00 ; C23C2/40 ; C21D1/74 ; C21D1/76 ; C21D8/02 ; C21D9/56 ; C21D1/52 ; C21D6/00 ; C21D9/46 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/12 ; C22C38/14 ; C22C38/20 ; C22C38/22 ; C22C38/26 ; C22C38/28 ; C22C38/32 ; C22C38/42 ; C22C38/44 ; C22C38/48 ; C22C38/50 ; C23C2/36 ; B32B15/01 ; C22C18/00 ; C22C38/16 ; C22C38/38 ; C22C38/54 ; C22C38/58
Abstract:
A hot-dip galvanized steel sheet having a good appearance and good adhesion to a coating, the hot-dip galvanized steel sheet having a composition containing, on a mass basis: C: 0.08% or more and less than 0.20%, Si: 0.1% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%, and S: 0.200% or less, a remainder being Fe and incidental impurities, wherein the hot-dip galvanized steel sheet includes an internal oxidation layer and a decarburized layer, the internal oxidation layer having a thickness of 5 μm or less, the decarburized layer having a thickness of 20 μm or less, and 50% or more by area of the internal oxidation layer is composed of a Si oxide containing Fe and/or Mn represented by Fe2XMn2-2XSiOY, wherein X ranges from 0 to 1, and Y is 3 or 4.
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