Title:
HIGH-STRENGTH SEAMLESS STEEL TUBE FOR USE IN OIL WELLS, WHICH HAS EXCELLENT RESISTANCE TO SULFIDE STRESS CRACKING AND PRODUCTION METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2010/150915
Kind Code:
A1
Abstract:
Disclosed is a high-strength seamless steel pipe, which has excellent sulfide stress cracking resistance (SSC resistance), for use in oil wells. Specifically the seamless steel pipe has a composition containing, by mass %: C: 0.15-0.50%, Si: 0.1-1.0%, Mn: 0.3-1.0%, P: 0.015% or less, S: 0.005% or less, Al: 0.01-0.1% or less, N: 0.01% or less, Cr: 0.1-1.7%, Mo: 0.40-1.1%, V: 0.01-0.08%, Nb: 0.01-0.08%, B: 0.0005-0.003% and optionally Cu: 0.03-1.0%; where 0.40% or more of solute Mo is included within the aforementioned Mo; and a composition formed by the dispersal of 0.06 mass % or more of roughly particulate M2C precipitates, which has a tempered martensite main phase and has prior austenite grains with a grain number of 8.5 or greater.
Inventors:
EGUCHI KENICHIRO (JP)
TANAKA YUJI (JP)
KIMURA MITSUO (JP)
ISHIGURO YASUHIDE (JP)
YAMADA KATSUMI (JP)
NAKAMICHI HARUO (JP)
TANAKA YUJI (JP)
KIMURA MITSUO (JP)
ISHIGURO YASUHIDE (JP)
YAMADA KATSUMI (JP)
NAKAMICHI HARUO (JP)
Application Number:
PCT/JP2010/061093
Publication Date:
December 29, 2010
Filing Date:
June 23, 2010
Export Citation:
Assignee:
JFE STEEL CORP (JP)
EGUCHI KENICHIRO (JP)
TANAKA YUJI (JP)
KIMURA MITSUO (JP)
ISHIGURO YASUHIDE (JP)
YAMADA KATSUMI (JP)
NAKAMICHI HARUO (JP)
EGUCHI KENICHIRO (JP)
TANAKA YUJI (JP)
KIMURA MITSUO (JP)
ISHIGURO YASUHIDE (JP)
YAMADA KATSUMI (JP)
NAKAMICHI HARUO (JP)
International Classes:
C22C38/00; C21D9/08; C22C38/32; C22C38/54
Domestic Patent References:
| WO2005073421A1 | 2005-08-11 |
Foreign References:
| JPH07197125A | 1995-08-01 | |||
| JPH06116635A | 1994-04-26 | |||
| JP2001073086A | 2001-03-21 | |||
| JPH06220536A | 1994-08-09 | |||
| JP2003041341A | 2003-02-13 | |||
| JP2007016291A | 2007-01-25 | |||
| JPH06235045A | 1994-08-23 | |||
| JP2000297344A | 2000-10-24 | |||
| JP2000178682A | 2000-06-27 | |||
| JP2001172739A | 2001-06-26 |
Other References:
NAKAJIMA ET AL., CAMP-ISIJ, vol. 17, 2004, pages 396
Attorney, Agent or Firm:
OCHIAI, Kenichiro (JP)
Ken-ichiro Ochiai (JP)
Ken-ichiro Ochiai (JP)
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