Invention Grant
- Patent Title: Steel plate and steel pipe for line pipes
- Patent Title (中): 钢管钢管钢管
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Application No.: US12741271Application Date: 2008-11-07
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Publication No.: US08801874B2Publication Date: 2014-08-12
- Inventor: Nobuyuki Ishikawa , Makoto Suzuki , Tomohiro Matsushima , Akiyoshi Tsuji , Shinichi Kakihara , Nobuo Shikanai , Yutaka Awajiya
- Applicant: Nobuyuki Ishikawa , Makoto Suzuki , Tomohiro Matsushima , Akiyoshi Tsuji , Shinichi Kakihara , Nobuo Shikanai , Yutaka Awajiya
- Applicant Address: JP
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP
- Agency: DLA Piper LLP (US)
- Priority: JP2007-290220 20071107
- International Application: PCT/JP2008/070726 WO 20081107
- International Announcement: WO2009/061006 WO 20090514
- Main IPC: C22C38/00
- IPC: C22C38/00 ; C22C38/18 ; C22C38/14 ; C22C38/12 ; F16L9/00
Abstract:
A steel plate for line pipes containing, in terms of % by weight, C: 0.02 to 0.06%, Si: 0.5% or less, Mn: 0.8 to 1.6%, P: 0.008% or less, S: 0.0008% or less, Al: 0.08% or less, Nb: 0.005 to 0.035%, Ti: 0.005 to 0.025%, and Ca: 0.0005 to 0.0035%, and optionally contains one or more of Cu: 0.5% or less, Ni: 1% or less, Cr: 0.5% or less, Mo: 0.5% or less and V: 0.1% or less, and has a CP value of 0.95 or less represented by CP=4.46C(%)+2.37Mn(%)/6+{1.18Cr(%)+1.95Mo(%)+1.74V(%)}/5+{1.74Cu(%)+1.7Ni(%)}/15+22.36P(%), and a Ceq value of 0.30 or more represented by Ceq=C(%)+Mn(%)/6+{Cr(%)+Mo(%)+V(%)}/5 +{Cu(%)+Ni(%)}/15.
Public/Granted literature
- US20100326559A1 STEEL PLATE AND STEEL PIPE FOR LINE PIPES Public/Granted day:2010-12-30
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