发明申请
- 专利标题: Hot Dip Al Coated Steel Sheet Excellent in Heat Black Discoloration Resistance and Method of Production of Same
- 专利标题(中): 热浸镀铝钢板耐热黑色耐变色性及其制作方法
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申请号: US13704786申请日: 2010-06-21
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公开(公告)号: US20130095345A1公开(公告)日: 2013-04-18
- 发明人: Jun Maki , Shinichi Yamaguchi
- 申请人: Jun Maki , Shinichi Yamaguchi
- 国际申请: PCT/JP2010/060917 WO 20100621
- 主分类号: C23C2/12
- IPC分类号: C23C2/12
摘要:
In conventional Al coated steel sheet, with the Al coating as it is, black discoloration cannot be prevented at 550° C. or more. For this reason, post annealing is used to form a barrier layer and suppress the formation of Fe—Al intermetallic compounds. However, with this method, there were the problems that the steel sheet became poor in workability and, further, high temperature, long time heating was required, so there were problems from the workability, economy, and environmental aspect. The present invention provides steel sheet which has a heat black discoloration resistance even at a 550° C. or more high temperature without additional annealing after Al coating and further is excellent in workability.That is, it is hot dip Al coated steel sheet which comprises steel sheet which contains predetermined ingredients of C, Si, P, S, Al, N, and O plus one or both of furthermoreNi: 0.01 to 0.1% or Cu: 0.01 to 0.1% and satisfies 10×C+Ni+Cu>0.03 and an Al coating layer which contains Si: 4 to 11% on the surface of that steel sheet and which have a thickness 5 μm or less Al—Fe—Si alloy layer in the interface between the Al coating layer and the steel sheet.
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