Invention Grant
- Patent Title: Cryogenic steel plate and method for manufacturing same
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Application No.: US16763061Application Date: 2018-06-22
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Publication No.: US11608549B2Publication Date: 2023-03-21
- Inventor: Hak-Cheol Lee
- Applicant: POSCO
- Applicant Address: KR Pohang-si
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si
- Agency: Morgan, Lewis & Bockius LLP
- Priority: KR10-2017-0154083 20171117
- International Application: PCT/KR2018/007090 WO 20180622
- International Announcement: WO2019/098480 WO 20190523
- Main IPC: C22C38/08
- IPC: C22C38/08 ; C21D1/18 ; C21D8/02 ; C21D9/46 ; C22C38/02 ; C22C38/04

Abstract:
Provided are a cryogenic steel plate and a method for manufacturing the same, the cryogenic steel plate comprising, in wt %, 0.04 to 0.08% carbon (C), 8.9 to 9.3% nickel (Ni), 0.6 to 0.7% manganese (Mn), and 0.2 to 0.3% silicon (Si), and 50 ppm or less of P, 10 ppm or less of S, and the remainder in iron (Fe) and various unavoidable impurities, and the microstructure at a ¼t location of the steel plate, where t is a thickness of the steel plate, comprising, in % surface area, 10% or more of tempered bainite, 10% or less of residual austenite, and the remainder of tempered martensite.
Public/Granted literature
- US20200347487A1 CRYOGENIC STEEL PLATE AND METHOD FOR MANUFACTURING SAME Public/Granted day:2020-11-05
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