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Title:
SEAMLESS STEEL PIPE AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2018/025778
Kind Code:
A1
Abstract:
A seamless steel pipe which has a chemical composition that contains, in mass%, 0.10-0.20% of C, 0.05-1.0% of Si, 0.05-1.2% of Mn, 0.025% or less of P, 0.005% or less of S, 0.20% or less of Cu, 0.007% or less of N, 0.20-0.50% of Ni, 0.30% or more but less than 0.50% of Cr, 0.30-0.50% of Mo, 0.01-0.05% of Nb, 0.001-0.10% of Al, 0.0005-0.0020% of B, 0.003-0.050% of Ti, 0.01-0.20% of V and 0-0.025% in total of one or more elements selected from among Ca, Mg and REM, with the balance made up of Fe and unavoidable impurities, and wherein: Pcm = (C + (Si/30) + (Mn/20) + (Cu/20) + (Ni/60) + (Cr/20) + (Mo/15) + (V/10) + 5B) ≤ 0.30; the tempered martensite in the metal structure is 90% by area or more; the tensile strength is 980 MPa or more; and the Charpy impact value at -40°C as determined using a 2 mm V-notch test piece is 75 J/cm2 or more.

Inventors:
MIKI TAKESHI (JP)
ARAI YUJI (JP)
MIHARA YUSUKE (JP)
UCHIDA YOHSUKE (JP)
YAMAZAKI MASAHIRO (JP)
YAMAMOTO MASAYUKI (JP)
Application Number:
PCT/JP2017/027529
Publication Date:
February 08, 2018
Filing Date:
July 28, 2017
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C21D8/10; C21D9/08; C22C38/54
Domestic Patent References:
WO2008050628A12008-05-02
WO2010061882A12010-06-03
Foreign References:
JP2016094649A2016-05-26
JP2012193404A2012-10-11
JP2013139610A2013-07-18
JP2006283117A2006-10-19
JP2012107333A2012-06-07
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
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