Invention Grant
- Patent Title: Hot-rolled steel sheet for high-strength electric-resistance welded pipe having sour-gas resistance and excellent weld toughness, and method for manufacturing the same
- Patent Title (中): 具有耐酸气性和优异的焊接韧性的高强度电阻焊管热轧钢板及其制造方法
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Application No.: US11049836Application Date: 2005-02-03
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Publication No.: US07879287B2Publication Date: 2011-02-01
- Inventor: Takashi Kobayashi , Hiroshi Nakata , Chikara Kami , Toru Inazumi , Shuji Kawamura
- Applicant: Takashi Kobayashi , Hiroshi Nakata , Chikara Kami , Toru Inazumi , Shuji Kawamura
- Applicant Address: JP
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP
- Agency: DLA Piper LLP (US)
- Priority: JP2004-047162 20040224
- Main IPC: C22C38/60
- IPC: C22C38/60 ; C22C38/14 ; C22C38/12 ; C22C38/00 ; C21D9/08 ; C21D9/52 ; C21D8/02
Abstract:
A hot-rolled steel sheet for high-strength ERW pipes contains about 0.02% to about 0.06% C; about 0.05% to about 0.50% Si; about 0.5% to about 1.5% Mn; about 0.010% or less P; about 0.0010% or less S; about 0.01% to about 0.10% Al; about 0.01% to about 0.10% Nb; about 0.001% to about 0.025% Ti; about 0.001% to about 0.005% Ca; about 0.003% or less 0; and about 0.005% or less N, and at least one element selected from the group consisting of about 0.01% to about 0.10% V; about 0.01% to about 0.50% Cu; about 0.01% to about 0.50% Ni; and about 0.01% to about 0.50% Mo on the basis of mass. The group of C, Si, Mn, Cu, Ni, Mo, and V and the group of Ca, 0, and S satisfy specific relationships, and the microstructure of the steel sheet is composed of about 95% by volume or more bainitic ferrite.
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