Invention Grant
- Patent Title: Hot-rolled steel sheet and method of producing the same
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Application No.: US14008205Application Date: 2012-04-13
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Publication No.: US09752217B2Publication Date: 2017-09-05
- Inventor: Tatsuo Yokoi , Hiroshi Shuto , Riki Okamoto , Nobuhiro Fujita , Kazuaki Nakano , Takeshi Yamamoto
- Applicant: Tatsuo Yokoi , Hiroshi Shuto , Riki Okamoto , Nobuhiro Fujita , Kazuaki Nakano , Takeshi Yamamoto
- 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: JP2011-089520 20110413
- International Application: PCT/JP2012/060132 WO 20120413
- International Announcement: WO2012/141290 WO 20121018
- Main IPC: C21D8/02
- IPC: C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/08 ; C22C38/12 ; C22C38/14 ; C22C38/16 ; C22C38/28 ; C22C38/34 ; C22C38/38

Abstract:
In a hot-rolled steel sheet, an average pole density of an orientation group {100} to {223} , which is represented by an arithmetic mean of pole densities of orientations {100} , {116} , {114} , {112} , and {223} is 1.0 to 4.0 and a pole density of a crystal orientation {332} is 1.0 to 4.8, in a thickness center portion which is a thickness range of ⅝ to ⅜ from the surface of the steel sheet; an average grain size in the thickness center portion is less than or equal to 10 μm and a grain size of cementite precipitating in a grain boundary of the steel sheet is less than or equal to 2 μm; and an average grain size of precipitates containing TiC in grains is less than or equal to 3 nm and a number density per unit volume is greater than or equal to 1×1016 grains/cm3.
Public/Granted literature
- US20140014237A1 HOT-ROLLED STEEL SHEET AND METHOD OF PRODUCING THE SAME Public/Granted day:2014-01-16
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