Invention Grant
US07648587B2 Steel product for use as line pipe having high HIC resistance and line pipe produced using such steel product
有权
钢产品用作具有高HIC电阻的管线管和使用这种钢产品生产的管线管
- Patent Title: Steel product for use as line pipe having high HIC resistance and line pipe produced using such steel product
- Patent Title (中): 钢产品用作具有高HIC电阻的管线管和使用这种钢产品生产的管线管
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Application No.: US10588122Application Date: 2004-06-17
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Publication No.: US07648587B2Publication Date: 2010-01-19
- Inventor: Takahiro Kushida , Tomohiko Omura , Mitsuhiro Numata
- Applicant: Takahiro Kushida , Kazuyo Kushida, legal representative , Tomohiko Omura , Mitsuhiro Numata
- Applicant Address: JP Osaka
- Assignee: Sumitomo Metal Industries, Ltd.
- Current Assignee: Sumitomo Metal Industries, Ltd.
- Current Assignee Address: JP Osaka
- Agency: Clark & Brody
- Priority: JP2004-028635 20040204
- International Application: PCT/JP2004/008542 WO 20040617
- International Announcement: WO2005/075694 WO 20050818
- Main IPC: C22C38/00
- IPC: C22C38/00
Abstract:
A steel product for a line pipe according to the invention has a composition containing, in mass %, C : 0.03% to 0.15%, Si: 0.05% to 1.0%, Mn: 0.5% to 1.8%, P: 0.015% or less, S: 0.004% or less, O: 0.01% or less, N: 0.007% or less, sol. Al: 0.01% to 0.1%, Ti: 0.024% or less, Ca: 0.0003% to 0.02%, and the balance consisting of Fe and impurities. The size of TiN in the steel product for a line pipe is at most 30 μm. The steel product has high HIC resistance and its crack area ratio can be reduced to 3% or less.
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