HIGH STRENGTH STAINLESS STEEL SEAMLESS PIPE FOR OIL WELL AND MANUFACTURING METHOD THEREFOR

Title:

HIGH STRENGTH STAINLESS STEEL SEAMLESS PIPE FOR OIL WELL AND MANUFACTURING METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2017/138050

Kind Code:

A1

Abstract:

Provided is a high strength stainless steel seamless pipe for an oil well that has high strength, excellent low temperature toughness, and excellent corrosion resistance even if the wall is thick. The pipe has a composition containing, in mass%, C: 0.05% or less, Si: 1.0% or less, Mn: 0.1-0.5%, P: 0.05% or less, S: less than 0.005%, Cr: greater than 15.0% to 19.0%, Mo: greater than 2.0% to 3.0%, Cu: 0.3-3.5%, Ni: 3.0% to less than 5.0%, W: 0.1-3.0%, Nb: 0.07-0.5%, V: 0.01-0.5%, Al: 0.001-0.1%, N: 0.010-0.100%, and O: 0.01% or less, wherein Nb, Ta, C, N and Cu satisfy a specified formula and the balance is made of Fe and unavoidable impurities. The pipe is configured to have a structure comprising, in volume fraction, at least 45% of tempered martensite phases, 20-40% of ferrite phases, and greater than 10% to 25% of retained austenite phases.

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Inventors:

EGUCHI KENICHIRO (JP)
ISHIGURO YASUHIDE (JP)

Application Number:

PCT/JP2016/004800

Publication Date:

August 17, 2017

Filing Date:

November 02, 2016

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/48; C21D8/10; C21D9/08; C22C38/54

Domestic Patent References:

WO2005017222A1	2005-02-24
WO2014097628A1	2014-06-26
WO2014112353A1	2014-07-24
WO2013179667A1	2013-12-05
WO2010050519A1	2010-05-06
WO2010050519A1	2010-05-06
WO2010134498A1	2010-11-25
WO2013146046A1	2013-10-03

Foreign References:

JP2005336595A	2005-12-08
JP2008081793A	2008-04-10
JP2010209402A	2010-09-24
JP2012149317A	2012-08-09

Other References: