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Title:
STEEL MATERIAL SUITABLE FOR USE IN ACIDIC ENVIRONMENTS
Document Type and Number:
WIPO Patent Application WO/2019/188740
Kind Code:
A1
Abstract:
Provided is a steel material which has excellent SSC resistance and a yield strength of 965-1,069 MPa (140 ksi class). A steel material according to the present disclosure has a chemical composition that contains, in mass%, 0.20-0.50% of C, 0.05-1.00% 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, 0.20-1.50% of Cr, 0.25-1.50% of Mo, 0.002-0.050% of Ti, 0.0001-0.0050% of B, 0.0100% or less of N and 0.0100% or less of O, with the balance being made up of Fe and impurities. This steel material according to the present disclosure contains solid solution C in an amount of 0.010-0.050% by mass. This steel material according to the present disclosure has a yield strength of 965-1,069 MPa and a yield ratio of 90% or more.

Inventors:
YOSHIDA SHINJI (JP)
ARAI YUJI (JP)
SOMA ATSUSHI (JP)
KAMITANI HIROKI (JP)
Application Number:
PCT/JP2019/011962
Publication Date:
October 03, 2019
Filing Date:
March 22, 2019
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/10; C22C38/54
Domestic Patent References:
WO2017200033A12017-11-23
WO2016093161A12016-06-16
WO2018066689A12018-04-12
Foreign References:
JP2012036501A2012-02-23
JP2010159466A2010-07-22
JP2000256783A2000-09-19
JP2000119798A2000-04-25
JPH10280037A1998-10-20
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
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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