Invention Application
- Patent Title: HOT-ROLLED STEEL SHEET
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Application No.: US15538404Application Date: 2015-02-20
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Publication No.: US20170349967A1Publication Date: 2017-12-07
- Inventor: Tatsuo YOKOI , Mitsuru YOSHIDA , Natsuko SUGIURA , Hiroshi SHUTO , Masayuki WAKITA
- Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee Address: JP Tokyo
- International Application: PCT/JP2015/054846 WO 20150220
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C21D6/00 ; C22C38/08 ; C22C38/06 ; C22C38/04 ; C21D8/02 ; C22C38/00 ; B21B3/02 ; C22C38/18 ; C22C38/16 ; C22C38/14 ; C22C38/12 ; C22C38/10 ; C22C38/02

Abstract:
A hot-rolled steel sheet includes a specific chemical composition, and includes a microstructure represented by, in vol %: retained austenite: 2% to 30%; ferrite: 20% to 85%; bainite: 10% to 60%; pearlite: 5% or less; and martensite: 10% or less. A proportion of grains having an intragranular misorientation of 5° to 14° in all grains is 5% to 50% by area ratio, the grain being defined as an area which is surrounded by a boundary having a misorientation of 15° or more and has a circle-equivalent diameter of 0.3 μm or more.
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