Invention Grant
- Patent Title: Ultra high strength hot rolled steel sheet having low deviation of mechanical property and excellent surface quality, and method for manufacturing same
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Application No.: US16628436Application Date: 2018-07-06
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Publication No.: US11421295B2Publication Date: 2022-08-23
- Inventor: Jong-Pan Kong , Jea-Sook Chung
- Applicant: POSCO
- Applicant Address: KR Pohang-si
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si
- Agency: Cantor Colburn LLP
- Priority: KR10-2017-0085932 20170706
- International Application: PCT/KR2018/007718 WO 20180706
- International Announcement: WO2019/009675 WO 20190110
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C21D6/00 ; C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/06 ; C22C38/26 ; C22C38/28 ; C22C38/32 ; C22C38/38

Abstract:
Provided is an ultra high-strength hot-rolled steel sheet, having tensile strength of 800 MPa, and a method for manufacture same, the method enabling excellent surface quality, workability, weldability as well as significantly reduced deviation of the mechanical property in the width and length directions of the steel sheet by means of an endless rolling mode in a continuous casting-direct rolling process.
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