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Title:
WELDED STEEL PIPE EXCELLENT IN COLLAPSE RESISTANCE AND INTERNAL PRESSURE FRACTURE RESISTANCE, AND MANUFACTURING METHOD THEREOF
Document Type and Number:
Japanese Patent JP2013180311
Kind Code:
A
Abstract:

To provide a line pipe with high strength which can realize both characteristics of collapse resistance and internal pressure fracture resistance, and to provide a method of manufacturing the line pipe.

A welded steel pipe with excellent collapse resistance and internal pressure fracture resistance is formed by cold-working a steel material to a tubular shape and welding its butting portion and cold-forming a welded pipe by expansion and diameter reduction. In the welded steel pipe, tensile yield stress CT in a pipe circumferential direction, compressive yield stress CC in the pipe circumferential direction and tensile yield stress LT in a pipe lengthwise direction are all 420 MPa or more, a mutual difference of the CT, CC and LT is 50 MPa or less.


Inventors:
TANIZAWA AKIHIKO
HORIE MASAYUKI
OKATSU MITSUHIRO
NISHIMURA KIMIHIRO
MITAO SHINJI
Application Number:
JP2012044920A
Publication Date:
September 12, 2013
Filing Date:
March 01, 2012
Export Citation:
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Assignee:
JFE STEEL CORP
International Classes:
B21C37/08
Domestic Patent References:
JP2002206140A2002-07-26
JP2009275261A2009-11-26
JPH093545A1997-01-07
JP2002102931A2002-04-09
JP2003340518A2003-12-02
JP2002295736A2002-10-09
JP2003342639A2003-12-03
JP2004035925A2004-02-05
JP2010235993A2010-10-21
JP2010084171A2010-04-15
JP2003094113A2003-04-02
JPH091233A1997-01-07
JP2002206140A2002-07-26
JP2009275261A2009-11-26
JP2002102931A2002-04-09
JP2010235993A2010-10-21
Attorney, Agent or Firm:
Shigeru Inoue
Kazuhiro Mori



 
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