Title:
STEEL MATERIAL AND HYDROGEN CONTAINER AS WELL AS MANUFACTURING METHODS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2014/156187
Kind Code:
A1
Abstract:
Provided are: a steel material for which fatigue crack propagation rate in a high pressure hydrogen environment can be reduced more than with prior steel; a hydrogen container; and manufacturing methods therefor. A steel material with a steel structure having a component composition containing, in mass%, C: 0.05-0.60%, Si: 0.01-2.0%, Mn: 0.3-3.0%, P: 0.001-0.040%, S: 0.0001-0.010%, N: 0.0001-0.0060%, and Al: 0.01-1.5%, also containing at least one from among Ti: 0.01-0.20%, Nb: 0.01-0.20%, and V: 0.01% to less than 0.05%, and containing at least one from among B: 0.0001-0.01%, Mo: 0.005-2.0% and Cr: 0.005-3.0%, the remainder being Fe and unavoidable impurities. In the steel structure, at least 95% by volume fraction is tempered martensite, the density of deposits with a diameter of not more than 100 nm and having at least one of Ti, Nb and V and at least one of carbon and nitrogen is at least 50 grains/µm2, and the prior austenite grain diameter is at least 3 µm.
Inventors:
TAKAGI SHUSAKU (JP)
NAGAO AKIHIDE (JP)
NAGAO AKIHIDE (JP)
Application Number:
PCT/JP2014/001832
Publication Date:
October 02, 2014
Filing Date:
March 28, 2014
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D6/00; C21D8/02; C21D8/10; C21D9/08; C22C38/38; C22C38/60
Domestic Patent References:
| WO2011025015A1 | 2011-03-03 |
Foreign References:
| JP2007270293A | 2007-10-18 | |||
| JP2010018862A | 2010-01-28 | |||
| JP2010037652A | 2010-02-18 | |||
| JP2011052321A | 2011-03-17 | |||
| JP2012214891A | 2012-11-08 | |||
| JP2005002386A | 2005-01-06 | |||
| JP2009046737A | 2009-03-05 | |||
| JP2009275249A | 2009-11-26 | |||
| JP2009074122A | 2009-04-09 | |||
| JP2010037655A | 2010-02-18 | |||
| JP2012107332A | 2012-06-07 | |||
| JP2012107333A | 2012-06-07 |
Other References:
YORU WADA, JOURNAL OF THE HYDROGEN ENERGY SYSTEMS SOCIETY OF JAPAN, vol. 35, no. 4, 2010, pages 38 - 44
TAISUKE MIYAMOTO ET AL., TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS (SERIES A, vol. 78, no. 788, 2012, pages 531 - 546
JIS Z2201, 1980
See also references of EP 2980246A4
TAISUKE MIYAMOTO ET AL., TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS (SERIES A, vol. 78, no. 788, 2012, pages 531 - 546
JIS Z2201, 1980
See also references of EP 2980246A4
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
Akira Kumasaka (JP)
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