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1.发明公开公开(公告)号：US20240060161A1
公开(公告)日：2024-02-22
申请号：US18267428
申请日：2021-12-01
Applicant: POSCO CO., LTD
Inventor： Jae-Hoon LEE , Ki-Taek JUNG
CPC classification number: C22C38/04 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/06
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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2.发明公开公开(公告)号：US20240011118A1
公开(公告)日：2024-01-11
申请号：US18267084
申请日：2021-12-01
Applicant: POSCO CO., LTD
Inventor： Jae-Hoon LEE , Sang-Ho HAN
IPC: C21D9/46 , C22C38/38 , C22C38/32 , C22C38/22 , C22C38/60 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/10 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00 , C21D1/18 , C21D1/84
CPC classification number: C21D9/46 , C22C38/38 , C22C38/32 , C22C38/22 , C22C38/60 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/10 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/008 , C22C38/005 , C22C38/002 , C22C38/001 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D6/001 , C21D6/002 , C21D6/005 , C21D6/007 , C21D6/008 , C21D1/18 , C21D1/84 , C21D2211/005 , C21D2211/002 , C21D2211/008 , C21D2211/009 , C21D2211/001
Abstract: Provided is a steel sheet which can be used for automobile parts and the like, and relates to a steel sheet and a method for manufacturing same, the steel sheet having an excellent balance between strength and ductility, an excellent balance between strength and hole expansion properties, and an excellent yield ratio evaluation score. 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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公开(公告)号：US20250051889A1
公开(公告)日：2025-02-13
申请号：US18719489
申请日：2022-12-14
Applicant: POSCO CO., LTD
Inventor： Jae-Hoon LEE , Seong-Ho HAN , Yong-Hoon CHOI
Abstract: The present invention relates to a high-strength steel sheet having excellent formability and a high yield ratio, and a manufacturing method therefor, and more particularly, to a high-strength steel sheet having excellent formability and a high yield ratio, and a manufacturing method therefor, the steel sheet having various uses such as that of vehicle parts.
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4.发明公开公开(公告)号：US20240011117A1
公开(公告)日：2024-01-11
申请号：US18267082
申请日：2021-12-01
Applicant: POSCO CO., LTD
Inventor： Jae-Hoon LEE , Young-Roc IM
CPC classification number: C21D9/46 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/002 , C22C38/001 , C21D8/0236 , C21D8/0226 , C21D8/0273 , C23G1/00 , C21D2211/002 , C21D2211/008 , C21D2211/001
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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