Invention Grant
- Patent Title: Hot-rolled steel sheet
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Application No.: US17044693Application Date: 2019-04-17
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Publication No.: US11434555B2Publication Date: 2022-09-06
- Inventor: Takeshi Toyoda , Tetsuya Hirashima , Riki Okamoto
- Applicant: NIPPON STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL CORPORATION
- Current Assignee: NIPPON STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JPJP2018-079352 20180417
- International Application: PCT/JP2019/016395 WO 20190417
- International Announcement: WO2019/203251 WO 20191024
- Main IPC: C22C38/02
- IPC: C22C38/02 ; C22C38/04 ; C22C38/22 ; C22C38/26 ; C22C38/28 ; C22C38/34 ; C21D8/02 ; C21D9/46 ; C22C38/00 ; C22C38/06

Abstract:
The hot-rolled steel sheet includes, in % by mass, 0.10% or more and 0.50% or less of C; 0.10% or more and 3.0% or less of Si; 0.5% or more and 3.0% or less of Mn; 0.10% or less of P; 0.010% or less of S; 1.00% or less of Al; 0.010% or less of N; 0% or more and 0.20% or less of Ti; 0% or more and 0.100% or less of Nb; 0% or more and 0.0060% or less of Ca; 0% or more and 0.50% or less of Mo; and 0% or more and 1.00% or less of Cr; with the balance comprising Fe and impurities, and an average grain size of prior austenite in a structure is 0.1 μm or larger and 3.0 μm or smaller, and a sheet crown quantity corresponding to a thickness difference between a width center portion and a portion away, by 10 mm, from a width edge portion in the widthwise direction toward the width center portion is 80 μm or smaller.
Public/Granted literature
- US20210040589A1 HOT-ROLLED STEEL SHEET Public/Granted day:2021-02-11
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