Invention Grant
- Patent Title: High strength steel sheet and high strength galvanized steel sheet excellent in shapeability and methods of production of same
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Application No.: US14235550Application Date: 2012-07-27
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Publication No.: US09896751B2Publication Date: 2018-02-20
- Inventor: Hiroyuki Kawata , Naoki Maruyama , Akinobu Murasato , Akinobu Minami , Takeshi Yasui , Yuji Yamaguchi , Natsuko Sugiura
- Applicant: Hiroyuki Kawata , Naoki Maruyama , Akinobu Murasato , Akinobu Minami , Takeshi Yasui , Yuji Yamaguchi , Natsuko Sugiura
- 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: JP2011-167722 20110729
- International Application: PCT/JP2012/069223 WO 20120727
- International Announcement: WO2013/018722 WO 20130207
- Main IPC: C22C38/38
- IPC: C22C38/38 ; C23C2/06 ; C23C2/28 ; B32B15/01 ; C21D8/02 ; C21D9/46 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/08 ; C22C38/12 ; C22C38/14 ; C22C38/16 ; C22C38/22 ; C22C38/26 ; C22C38/28 ; C22C38/32 ; C22C38/34 ; C23C2/02
Abstract:
High strength steel sheet and high strength galvanized steel sheet which are excellent in shapeability which secure a tensile maximum strength 900 MPa or more high strength while obtaining excellent ductility and stretch flangeability, which sheets have predetermined compositions of ingredients, have steel sheet structures which contain volume fraction 1 to 20% of residual austenite phases, and which have martensite transformation points of the residual austenite phases of −60° C. or less.
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