Invention Grant
- Patent Title: High-strength steel sheet having excellent processability and paint bake hardenability, and method for producing of high-strength steel sheet
- Patent Title (中): 优异的加工性和油漆烘烤硬化性的高强度钢板以及高强度钢板的制造方法
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Application No.: US13508407Application Date: 2010-11-09
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Publication No.: US08911567B2Publication Date: 2014-12-16
- Inventor: Toshio Ogawa , Naoki Matsutani , Koichi Goto , Shinichiro Watanabe , Nobuhiro Fujita , Toshiki Nonaka
- Applicant: Toshio Ogawa , Naoki Matsutani , Koichi Goto , Shinichiro Watanabe , Nobuhiro Fujita , Toshiki Nonaka
- Applicant Address: JP Tokyo
- Assignee: Nippon Steel & Sumitomo Metal Corporation
- Current Assignee: Nippon Steel & Sumitomo Metal Corporation
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JPP2009-255726 20091109
- International Application: PCT/JP2010/069940 WO 20101109
- International Announcement: WO2011/055844 WO 20110512
- Main IPC: C22C38/06
- IPC: C22C38/06 ; C22C38/18 ; C21D8/02 ; C23C2/02 ; C21D8/04 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C23C2/26 ; C23C2/28

Abstract:
The high-strength steel sheet includes, by mass %: C: 0.01% to 0.10%; Si: 0.15% or less; Mn: 0.80% to 1.80%; P: 0.10% or less; S: 0.015% or less; Al: 0.10% to 0.80%; Cr: 0.01% to 1.50%; N: 0.0100% or less; and a balance consisting of iron and inevitable impurities, in which a metallic structure is composed of ferrite and a hard second phase, the area fraction of the ferrite is 80% or more, the area fraction of the hard second phase is 1% to 20%, the fraction of unrecrystallized ferrite in the ferrite is less than 10%, the ferrite grain sizes are 5 μm to 20 μm, and the fraction of the ferrite crystal grains having an aspect ratio of 1.2 or less in the entire ferrite crystal grains is 60% or more.
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