Title:
ELECTRIC RESISTANCE WELDED STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2014/051119
Kind Code:
A1
Abstract:
An electric resistance welded steel pipe which has sufficient strength and low-temperature toughness and a low yield ratio and which is suitable as a line pipe to be laid in depths of the sea, characterized in that: the composition of the base material contains, in mass%, 0.05 to 0.10% of C, 1.00 to 1.60% of Mn, and 0.005 to less than 0.035% of Nb, and has a Ceq value of 0.23 to 0.38; and the metal structure of the base material contains 3 to 13% of martensite in area fraction with the balance being ferrite.
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Inventors:
SHINOHARA YASUHIRO (JP)
NAGAI KENSUKE (JP)
OZAKI MASAKAZU (JP)
NAGAI KENSUKE (JP)
OZAKI MASAKAZU (JP)
Application Number:
PCT/JP2013/076422
Publication Date:
April 03, 2014
Filing Date:
September 27, 2013
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; B21B3/00; B21C37/08; B23K13/00; C21D8/02; C21D9/46; C22C38/14; C22C38/58
Domestic Patent References:
| WO2012133558A1 | 2012-10-04 | |||
| WO2012008486A1 | 2012-01-19 | |||
| WO2005080621A1 | 2005-09-01 |
Foreign References:
| JP2008111162A | 2008-05-15 | |||
| JPH05105952A | 1993-04-27 | |||
| JPH10176239A | 1998-06-30 |
Other References:
See also references of EP 2902519A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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