Invention Grant
US08529829B2 High-strength hot-rolled steel sheet with excellent combined formability
有权
高强度热轧钢板,具有优异的组合成形性
- Patent Title: High-strength hot-rolled steel sheet with excellent combined formability
- Patent Title (中): 高强度热轧钢板,具有优异的组合成形性
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Application No.: US12294341Application Date: 2007-03-14
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Publication No.: US08529829B2Publication Date: 2013-09-10
- Inventor: Motoo Satou , Tetsuo Soshiroda
- Applicant: Motoo Satou , Tetsuo Soshiroda
- 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: JP2006-082968 20060324
- International Application: PCT/JP2007/055050 WO 20070314
- International Announcement: WO2007/122910 WO 20071101
- Main IPC: C22C38/16
- IPC: C22C38/16 ; C22C38/00 ; C22C38/08

Abstract:
Disclosed herein is a high-strength hot-rolled steel sheet which is characterized by high strength (in terms of tensile strength at 900 MPa level) and excellent combined formability expressed by balance between strength and ductility [tensile strength (TS)×total elongation (El)] and balance between strength and stretch flangeability [tensile strength (TS)×bore expanding ratio (λ)]. The hot-rolled steel sheet contains C: no less than 0.02% and no more than 0.15%, Si: no less than 0.2% and no more than 2.0%, Mn: no less than 0.5% and no more than 2.5%, Al: no less than 0.02% and no more than 0.15%, Cu: no less than 1.0% and no more than 3.0%, Ni: no less than 0.5% and no more than 3.0%, and Ti: no less than 0.03% and no more than 0.5%. (% means mass %) It also has a metallographic structure in longitudinal cross section such that the sum of bainitic ferrite and granular bainitic ferrite accounts for no less than 85% by area.
Public/Granted literature
- US20090136378A1 HIGH-STRENGTH HOT- ROLLED STEEL SHEET WITH EXCELLENT COMBINED FORMABILITY Public/Granted day:2009-05-28
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