Invention Grant
US08852360B2 High strength hot-rolled steel plate exhibiting excellent acid pickling property, chemical conversion processability, fatigue property, stretch flangeability, and resistance to surface deterioration during molding, and having isotropic strength and ductility
有权
表现出优异的酸洗性能，化学转化加工性，疲劳性能，拉伸凸缘性，以及成型时耐表面变质性的高强度热轧钢板，并且具有各向同性强度和延展性
- Patent Title: High strength hot-rolled steel plate exhibiting excellent acid pickling property, chemical conversion processability, fatigue property, stretch flangeability, and resistance to surface deterioration during molding, and having isotropic strength and ductility
- Patent Title (中): 表现出优异的酸洗性能，化学转化加工性，疲劳性能，拉伸凸缘性，以及成型时耐表面变质性的高强度热轧钢板，并且具有各向同性强度和延展性
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Application No.: US13509946Application Date: 2010-11-16
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Publication No.: US08852360B2Publication Date: 2014-10-07
- Inventor: Hiroyuki Tanahashi , Shinya Saitoh , Masashi Fukuda , Hiroyuki Okada , Kunio Hayashi , Toshimasa Tomokiyo , Nobuhiro Fujita
- Applicant: Hiroyuki Tanahashi , Shinya Saitoh , Masashi Fukuda , Hiroyuki Okada , Kunio Hayashi , Toshimasa Tomokiyo , Nobuhiro Fujita
- Applicant Address: JP Tokyo
- Assignee: Nippon Steel & Sumitomo Metal Corporation
- Current Assignee: Nippon Steel & Sumitomo Metal Corporation
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JPP2009-263268 20091118
- International Application: PCT/JP2010/070346 WO 20101116
- International Announcement: WO2011/062151 WO 20110526
- Main IPC: C22C38/02
- IPC: C22C38/02 ; C22C38/04 ; C22C38/06 ; C23C2/02 ; C22C38/12 ; C23C2/06 ; C21D9/46 ; C22C38/00 ; C22C38/14
Abstract:
This high strength hot-rolled steel sheet includes: in terms of percent by mass, C: 0.05 to 0.12%; Si: 0.8 to 1.2%; Mn: 1.6 to 2.2%; Al: 0.30 to 0.6%; P: 0.05% or less; S: 0.005% or less; and N: 0.01% or less, with the remainder being Fe and unavoidable impurities, wherein a microstructure includes specific ranges (in area %) of ferrite phases as well as martensite phases, and a maximum concentration of Al detected by a glow discharge emission spectroscopic analysis is in a range of 0.75 mass % or less in a region from a surface of the steel sheet to a thickness of 500 nm after being acid-pickled.
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