SEAMLESS STAINLESS STEEL PIPE FOR OIL WELL, AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2016/113794

A1

Provided are: a method for manufacturing a seamless stainless steel pipe for an oil well having excellent hot workability, whereby a high-strength, high-toughness seamless stainless steel pipe for an oil well can be obtained having a yield strength of 110 ksi (= 758 MPa), an absorbed energy vE-10 of 40 J or greater in Charpy impact testing at a test temperature of -10°C, and excellent corrosion resistance; and a seamless stainless steel pipe for an oil well obtained by the abovementioned manufacturing method. In the present invention, a billet having predetermined components and having a composition in which the contents of C, Si, Mn, Cr, Mo, Ni, N, W, and Cu satisfy a predetermined relationship is heated and furthermore hot-worked to obtain a seamless steel pipe, and the seamless steel pipe is cooled to room temperature at a cooling rate of air cooling or greater, after which the seamless steel pipe is heated to 850°C or above and subsequently cooled at a cooling rate of air-cooling or greater to a temperature of 100°C or below and quenched, and is then tempered at 700°C or below for a predetermined retention time.

JP5111000	Spinning method for ferritic stainless steel welded pipes
WO/2005/078148	METAL TUBE FOR USE IN CARBURIZING GAS ATMOSPHERE

FUJIMURA KAZUKI (JP)
ISHIGURO YASUHIDE (JP)
GOTO SEIGO (JP)

PCT/JP2015/006001

July 21, 2016

December 03, 2015

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JFE STEEL CORP (JP)

C21D8/10; C21D9/08; C22C38/00; C22C38/58

WO2013146046A1	2013-10-03
WO2011136175A1	2011-11-03

JP2005336595A	2005-12-08
JP2008081793A	2008-04-10
JP2013249516A	2013-12-12
JP2014114500A	2014-06-26
JP2012149317A	2012-08-09
JP2010209402A	2010-09-24
JP2015110822A	2015-06-18

See also references of EP 3246418A4

KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)

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