- 专利标题： High strength steel sheet having excellent cryogenic temperature toughness and low yield ratio properties, and method for manufacturing same
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申请号： US14654649申请日： 2012-12-28
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公开(公告)号： US10689735B2公开(公告)日： 2020-06-23
- 发明人: Sung-Ho Jang , Woo-Gyeom Kim , Ki-Hyun Bang
- 申请人： POSCO
- 申请人地址： KR Pohang-si
- 专利权人： POSCO
- 当前专利权人： POSCO
- 当前专利权人地址： KR Pohang-si
- 代理机构： Cantor Colburn LLP
- 优先权： com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@6fd440e3
- 国际申请： PCT/KR2012/011747 WO 20121228
- 国际公布： WO2014/104443 WO 20140703
- 主分类号： C22C38/16
- IPC分类号： C22C38/16 ; C21D6/00 ; C21D8/02 ; C21D9/46 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/12 ; C22C38/14 ; C22C38/08 ; C22C38/00 ; C22C38/20
摘要：
A high strength steel sheet comprises 0.02 to 0.12 wt % of carbon (C), 0.5 to 2.0 wt % of manganese (Mn), 0.05 to 0.5 wt % of silicon (Si), 0.05 to 1.0 wt % of nickel (Ni), 0.005 to 0.1 wt % of titanium (Ti), 0.005 to 0.5 wt % of aluminum (Al), 0.015 wt % or less of phosphorus (P), 0.015 wt % or less of sulfur (S), and the balance of Fe and other inevitable impurities. The microstructure thereof includes 70% to 90% of ultrafine ferrite and 10% to 30% of MA (martensite/austenite) structure by area fraction, and the yield ratio (YS/TS) thereof is 0.8 or less.
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