Invention Grant
- Patent Title: High strength thin steel excellent in hole expansibility, ductility and chemical treatment characteristics
- Patent Title (中): 高强度薄钢具有优异的孔膨胀性,延展性和化学处理特性
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Application No.: US10540418Application Date: 2003-12-24
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Publication No.: US07780797B2Publication Date: 2010-08-24
- Inventor: Riki Okamoto , Hirokazu Taniguchi
- Applicant: Riki Okamoto , Hirokazu Taniguchi
- Applicant Address: JP Tokyo
- Assignee: Nippon Steel Corporation
- Current Assignee: Nippon Steel Corporation
- Current Assignee Address: JP Tokyo
- Agency: Kenyon & Kenyon LLP
- Priority: JP2002-377097 20021226; JP2003-357281 20031017
- International Application: PCT/JP03/16614 WO 20031224
- International Announcement: WO2004/059024 WO 20040715
- Main IPC: C22C38/04
- IPC: C22C38/04 ; C22C38/06 ; C22C38/14

Abstract:
High strength hot rolled steel sheet having at least a 590 N/mm2 tensile strength and excellent in elongation and ability of phosphate coating, that is, high strength hot rolled steel sheet excellent in burring, elongation, and ability of phosphate coating having a tensile strength of 590 N/mm2 or more comprising a steel composition containing, by mass %, C: 0.02 to 0.08%, Si: 0.50% or less, Mn: 0.50 to 3.50%, P: 0.03% or less, S: 0.01% or less, Al: 0.15 to 2.0%, and the balance of iron and unavoidable impurities, satisfying Mn+0.5×Al
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