Invention Publication
- Patent Title: HIGH STRENGTH STEEL SHEET HAVING EXCELLENT WORKABILITY AND METHOD FOR MANUFACTURING SAME
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Application No.: US18267082Application Date: 2021-12-01
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Publication No.: US20240011117A1Publication Date: 2024-01-11
- Inventor: Jae-Hoon LEE , Young-Roc IM
- Applicant: POSCO CO., LTD
- Applicant Address: KR Pohang-si
- Assignee: POSCO CO., LTD
- Current Assignee: POSCO CO., LTD
- Current Assignee Address: KR Pohang-si
- Priority: KR 20200177516 2020.12.17
- International Application: PCT/KR2021/017992 2021.12.01
- Date entered country: 2023-06-13
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/00 ; C21D8/02 ; C23G1/00

Abstract:
Provided is a steel sheet that may be used for automobile parts and the like, and to a steel sheet having an excellent balance of strength and ductility, an excellent balance of strength and hole expansion ratio, and an excellent yield ratio evaluation index, and a method for manufacturing the same. The steel sheet includes: by wt %, C: 0.1 to 0.25%, Si: 0.01 to 1.5%, Mn: 1.0 to 4.0%, Al: 0.01 to 1.5%, P: 0.15% or less, S: 0.03% or less, N: 0.03% or less, B: 0.0005 to 0.005%, a balance of Fe, and unavoidable impurities; and as microstructures, bainite, tempered martensite, fresh martensite, retained austenite and unavoidable structures.
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