Title:
HIGH-STRENGTH STEEL PLATE FOR SOUR RESISTANT LINE PIPE, METHOD FOR MANUFACTURING SAME, AND HIGH-STRENGTH STEEL PIPE USING HIGH-STRENGTH STEEL PLATE FOR SOUR RESISTANT LINE PIPE
Document Type and Number:
WIPO Patent Application WO/2019/064459
Kind Code:
A1
Abstract:
The present invention provides a high-strength steel plate for sour resistant line pipe having superior HIC resistance in a center segregation part and surface layer part. This high-strength steel plate for sour resistant line pipe is characterized by having a component composition that includes a prescribed amount of C, Si, Mn, P, S, Al, and Ca, with the remainder being Fe and inevitable impurities and in that the hydrogen diffusion coefficient at the center of plate thickness is 5.0 × 10-6 cm2/s or greater, the maximum Vickers harness HV0.1 at 0.5 mm beneath the steel plate surface is 250 or less, and the tensile strength is 520 MPa or greater.
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Inventors:
YASUDA KYONO (JP)
YOKOTA TOMOYUKI (JP)
YOKOTA TOMOYUKI (JP)
Application Number:
PCT/JP2017/035330
Publication Date:
April 04, 2019
Filing Date:
September 28, 2017
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/06; C22C38/58
Domestic Patent References:
| WO2014010150A1 | 2014-01-16 | |||
| WO2006003775A1 | 2006-01-12 |
Foreign References:
| JP2012241270A | 2012-12-10 | |||
| JP2013139630A | 2013-07-18 | |||
| JP3951428B2 | 2007-08-01 | |||
| JP3951429B2 | 2007-08-01 | |||
| JP2002327212A | 2002-11-15 | |||
| JP3711896B2 | 2005-11-02 |
Other References:
See also references of EP 3677698A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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