Title:
HIGH STRENGTH SEAMLESS STAINLESS STEEL PIPE AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/131340
Kind Code:
A1
Abstract:
Provided are: a high strength seamless stainless steel pipe having a combination of high strength, excellent low temperature toughness and excellent corrosion resistance; and a production method therefor. The pipe has a composition that contains, in mass%, C: 0.012-0.05%, Si: 1.0% or less, Mn: 0.1-0.5%, P: 0.05% or less, S: 0.005% or less, Cr: greater than 16.0% to 18.0%; Mo: greater than 2.0% to 3.0%; Cu: 0.5-3.5%, Ni: 3.0% to less than 5.0%, W: 0.01-3.0%, Nb: 0.01-0.5%, Al: 0.001-0.1%, N: 0.012-0.07%, and O: 0.01% or less, the balance being Fe and unavoidable impurities. The pipe has a structure: which has tempered martensite phases as the main phase and is made, in volume fraction, of 20-40% of ferrite phases and 25% or less of retained austenite phases; and in which the C, Cr, Ni, Mo, Nb, N, W and Cu in the retained austenite phases satisfy a specified formula.
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Inventors:
KAMO YUICHI (JP)
YUGA MASAO (JP)
EGUCHI KENICHIRO (JP)
YUGA MASAO (JP)
EGUCHI KENICHIRO (JP)
Application Number:
PCT/JP2017/043775
Publication Date:
July 19, 2018
Filing Date:
December 06, 2017
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/10; C21D9/08; C22C38/48; C22C38/54
Domestic Patent References:
| WO2016079920A1 | 2016-05-26 | |||
| WO2016079922A1 | 2016-05-26 | |||
| WO2010050519A1 | 2010-05-06 | |||
| WO2010134498A1 | 2010-11-25 | |||
| WO2013146046A1 | 2013-10-03 |
Foreign References:
| JP2016033237A | 2016-03-10 | |||
| JP2015110822A | 2015-06-18 | |||
| JP2008297602A | 2008-12-11 | |||
| JP2016132821A | 2016-07-25 | |||
| JP2005336595A | 2005-12-08 | |||
| JP2008081793A | 2008-04-10 | |||
| JP2010209402A | 2010-09-24 | |||
| JP2012149317A | 2012-08-09 |
Other References:
See also references of EP 3569724A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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