Invention Grant
- Patent Title: High strength steel pipe for low-temperature usage having excellent buckling resistance and toughness of welded heat affected zone and method for producing the same
- Patent Title (中): 用于低温使用的高强度钢管具有优异的抗弯曲性和焊接热影响区的韧性及其制造方法
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Application No.: US13147992Application Date: 2010-02-05
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Publication No.: US08765269B2Publication Date: 2014-07-01
- Inventor: Junji Shimamura , Nobuyuki Ishikawa , Mitsuhiro Okatsu , Nobuo Shikanai
- Applicant: Junji Shimamura , Nobuyuki Ishikawa , Mitsuhiro Okatsu , Nobuo Shikanai
- Applicant Address: JP
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP
- Agency: DLA Piper LLP (US)
- Priority: JP2009-025477 20090206
- International Application: PCT/JP2010/052118 WO 20100205
- International Announcement: WO2010/090349 WO 20100812
- Main IPC: C22C38/00
- IPC: C22C38/00 ; B21B1/38 ; B21B3/00 ; B21C37/08 ; C21D8/02 ; C22C38/58 ; B23K9/025 ; B23K9/23
Abstract:
An APIX100-grade high strength steel pipe includes a base material containing, in mass percentage, C: more than 0.03% and 0.08% or less, Si: 0.01% to 0.5%, Mn: 1.5% to 3.0%, P: 0.015% or less, S: 0.005% or less, Al: 0.01% to 0.08%, Nb: 0.005% to 0.025%, Ti: 0.005% to 0.025%, N: 0.001% to 0.010%, O: 0.005% or less, and B: 0.0003% to 0.0020%, further contains one or more of Cu, Ni, Cr, Mo, and V, satisfies 0.19≦Pcm≦0.25, the balance being Fe and unavoidable impurities, and has a TS of 760 to 930 MPa, a uniform elongation of 5% or more, and a YR of 85% or less; the seam weld metal has a specific composition.
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