Title:
STAINLESS STEEL PIPE AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2022/224640
Kind Code:
A1
Abstract:
Provided are a stainless steel pipe and a manufacturing method thereof. This stainless steel pipe has: a component composition containing, by mass%, 0.05% or less of C, 1.0% or less of Si, 0.10 to 2.0% of Mn, 0.05% or less of P, less than 0.005% of S, more than 16.0% but not more than 20.0% of Cr, more than 0.6% but less than 1.4% of Mo, 3.0% or more but less than 5.0% of Ni, 0.001 to 0.10% of Al, 0.010 to 0.100% of N, 0.01% or less of O, 0.3 to 3.5% of Cu, and the balance Fe and inevitable impurities, wherein Cr, Ni, Mo, W, Cu, and C satisfy a prescribed relational expression; a structure comprising, by volume fraction, 45% or more of tempered martensite phase, 20 to 40% of ferrite phase, and 5% to 25% of retained austenite phase; a yield strength of 758 MPa or greater; and absorbed energy vE-10 of 40 J or greater at -10˚C.
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Inventors:
EGUCHI KENICHIRO (JP)
YUGA MASAO (JP)
YUGA MASAO (JP)
Application Number:
PCT/JP2022/011814
Publication Date:
October 27, 2022
Filing Date:
March 16, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/10; C21D9/08; C22C38/58; C22C38/60
Domestic Patent References:
| WO2016079922A1 | 2016-05-26 | |||
| WO2010050519A1 | 2010-05-06 | |||
| WO2010134498A1 | 2010-11-25 | |||
| WO2013146046A1 | 2013-10-03 |
Foreign References:
| JP2017031493A | 2017-02-09 | |||
| JP2017039998A | 2017-02-23 | |||
| JP2017048424A | 2017-03-09 | |||
| JP2005336595A | 2005-12-08 | |||
| JP2008081793A | 2008-04-10 | |||
| JP2010209402A | 2010-09-24 | |||
| JP2012149317A | 2012-08-09 | |||
| JP2019073789A | 2019-05-16 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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