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Title:
STEEL MATERIAL, STEEL PIPE FOR OIL WELLS, AND METHOD FOR PRODUCING STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2018/066689
Kind Code:
A1
Abstract:
Provided are a steel material and a steel pipe for oil wells, which have excellent SSC resistance and high strength, namely a yield strength of 862 MPa or more but less than 965 MPa. A steel material according to the present invention has a chemical composition that contains, in mass%, 0.25-0.50% of C, 0.05-0.50% of Si, 0.05-1.00% of Mn, 0.025% or less of P, 0.0100% or less of S, 0.005-0.100% of Al, 0.30-1.50% of Cr, 0.25-1.50% of Mo, 0.002-0.050% of Ti, 0.0001-0.0050% of B, 0.002-0.010% of N and 0.0100% or less of O, with the balance made up of Fe and impurities. This steel material additionally contains 0.010-0.050 mass% of solid-solved C. This steel material has a yield strength of 862 MPa or more but less than 965 MPa, and a yield ratio of 90% or more.

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Inventors:
ARAI YUJI (JP)
YOSHIDA SHINJI (JP)
SOMA ATSUSHI (JP)
KAMITANI HIROKI (JP)
Application Number:
PCT/JP2017/036459
Publication Date:
April 12, 2018
Filing Date:
October 06, 2017
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C22C38/54; C21D8/10; C21D9/08
Domestic Patent References:
WO2016103538A12016-06-30
WO2016059763A12016-04-21
WO2016038810A12016-03-17
WO2016013205A12016-01-28
WO2008138642A12008-11-20
Foreign References:
JPH11286720A1999-10-19
US20120211131A12012-08-23
JPS62253720A1987-11-05
JPS59232220A1984-12-27
JPH06322478A1994-11-22
JPH08311551A1996-11-26
JP2000256783A2000-09-19
JP2000297344A2000-10-24
JP2005350754A2005-12-22
JP2012519238A2012-08-23
JP2012026030A2012-02-09
Other References:
See also references of EP 3524706A4
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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