Invention Grant
- Patent Title: High-strength hot dip galvannealed steel sheet having high powdering resistance and method for producing the same
- Patent Title (中): 具有高耐粉蚀性的高强度热浸镀锌合金化钢板及其制造方法
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Application No.: US12094997Application Date: 2006-12-01
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Publication No.: US08025982B2Publication Date: 2011-09-27
- Inventor: Yuichi Futamura , Michitaka Tsunezawa , Masaaki Miura , Hiroshi Irie , Takatoshi Yoshida , Masafumi Shimizu
- Applicant: Yuichi Futamura , Michitaka Tsunezawa , Masaaki Miura , Hiroshi Irie , Takatoshi Yoshida , Masafumi Shimizu
- Applicant Address: JP Kobe-shi
- Assignee: Kobe Steel, Ltd.
- Current Assignee: Kobe Steel, Ltd.
- Current Assignee Address: JP Kobe-shi
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2005-352291 20051206
- International Application: PCT/JP2006/324114 WO 20061201
- International Announcement: WO2007/066600 WO 20070614
- Main IPC: B32B15/04
- IPC: B32B15/04 ; B32B15/18 ; B32B15/20 ; B05D1/18 ; B05D3/02 ; C21D1/70 ; C21D11/00
Abstract:
Disclosed is a high-strength hot dip galvannealed steel sheet having high powdering resistance produced by employing such a constitution that a Fe—Zn alloy plated layer is provided on at least one side of a basis steel sheet and a region in which Al (atomic %)/Zn (atomic %)≧0.10 is present in a thickness of 300 Å or more from the surface of the plated layer along the depth direction of the plated layer. Also disclosed is a hot dip galvannealed steel sheet whose formability is greatly improved by optionally specifying chemical composition and structure of the basis steel sheet.
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