Invention Grant
- Patent Title: Fire-resistant steel superior in weld joint reheat embrittlement resistance and toughness and method of production of same
- Patent Title (中): 焊接接头的耐火钢具有优异的耐热脆性和韧性及其制造方法
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Application No.: US12452200Application Date: 2009-03-24
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Publication No.: US08715432B2Publication Date: 2014-05-06
- Inventor: Yasushi Hasegawa , Masaki Mizoguchi , Yoshiyuki Watanabe , Suguru Yoshida , Tadayoshi Okada
- Applicant: Yasushi Hasegawa , Masaki Mizoguchi , Yoshiyuki Watanabe , Suguru Yoshida , Tadayoshi Okada
- Applicant Address: JP Tokyo
- Assignee: Nippon Steel & Sumitomo Metal Corporation
- Current Assignee: Nippon Steel & Sumitomo Metal Corporation
- Current Assignee Address: JP Tokyo
- Agency: Kenyon & Kenyon LLP
- Priority: JP2008-090571 20080331; JP2009-023777 20090204
- International Application: PCT/JP2009/056411 WO 20090324
- International Announcement: WO2009/123076 WO 20091008
- Main IPC: C21D6/02
- IPC: C21D6/02 ; C21D8/02 ; C22C38/00 ; C22C38/22 ; C22C38/44
Abstract:
The present invention provides high temperature strength and fire-resistant steel superior in weld joint reheat embrittlement resistance and toughness which is produced using steel of a room temperature strength of the 400 to 600N/mm2 class containing as main ingredients C: 0.010% to less than 0.05%, Si: 0.01 to 0.50%, Mn: 0.80 to 2.00%, Cr: 0.50% to less than 2.00%, V: 0.03 to 0.30%, Nb: 0.01 to 0.10%, N: 0.001 to 0.010%, and Al: 0.005 to 0.10%, limiting the contents of Ni, Cu, Mo, and B, and satisfying the relationship of 4Cr[%]-5Mo[%]-10Ni[%]-2Cu[%]-Mn[%]>0.
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