STAINLESS STEEL FOR OIL WELLS AND STAINLESS STEEL PIPE FOR OIL WELLS

Title:

STAINLESS STEEL FOR OIL WELLS AND STAINLESS STEEL PIPE FOR OIL WELLS

Document Type and Number:

WIPO Patent Application WO/2013/146046

Kind Code:

A1

Abstract:

Provided is stainless steel for oil wells, which has excellent corrosion resistance at high temperatures and is capable of stably achieving a strength of 758 MPa or more. This stainless steel for oil wells contains, in mass%, 0.05% or less of C, less than 1.0% of Si, 0.01-1.0% of Mn, 0.05% or less of P, 0.002% or less of S, 16-18% of Cr, 1.8-3% of Mo, 1.0-3.5% of Cu, 3.0-5.5% of Ni, 0.01-1.0% of Co, 0.001-0.1% of Al, 0.05% or less of O and 0.05% or less of N, with the balance made up of Fe and impurities. This stainless steel for oil wells satisfies the following formula (1) and formula (2). Cr + 4Ni + 3Mo + 2Cu ≥ 44 (1) Cr + 3Ni + 4Mo + 2Cu/3 ≤ 46 (2) In this connection, the contents (mass%) of corresponding elements are assigned to respective symbols of elements in formula (1) and formula (2).

Inventors:

NAKATSUKA SHINJIRO (JP)
OHE TARO (JP)
AMAYA HISASHI (JP)
TAKABE HIDEKI (JP)
OTOME YOHEI (JP)
TOMIO YUSAKU (JP)
SEO MASANAO (JP)
OMURA TOMOHIKO (JP)
KONDO KUNIO (JP)

Application Number:

PCT/JP2013/055219

Publication Date:

October 03, 2013

Filing Date:

February 27, 2013

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

C22C38/00; C22C38/52; C22C38/54; C21D9/08

Domestic Patent References:

WO2011136175A1	2011-11-03
WO2010050519A1	2010-05-06
WO2009119048A1	2009-10-01
WO2010050519A1	2010-05-06
WO2010134498A1	2010-11-25

Foreign References:

JP2007009321A	2007-01-18
JP2007277639A	2007-10-25
JP2008050646A	2008-03-06
JP2002004009A	2002-01-09
JP2005336595A	2005-12-08
JP2006016637A	2006-01-19
JP2007332442A	2007-12-27

Other References: