Title:
AUSTENITIC HEAT-RESISTANT ALLOY AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2017/119415
Kind Code:
A1
Abstract:
Provided is an austenitic heat-resistant alloy having high creep strength and high toughness even in a high-temperature environment. This austenitic heat-resistant alloy has a chemical composition containing, in terms of mass%, 0.03 to less than 0.25% C, 0.01-2.0% Si, 2.0% or less of Mn, 10 to less than 30% Cr, more than 25% to 45% Ni, more than 2.5% to less than 4.5% Al, 0.2-3.5% Nb, and 0.025% or less of N, the remainder comprising Fe and unavoidable impurities, and P and S being 0.04% or less and 0.01% or less, respectively, of the impurities. The gross moment of precipitates 6 µm or larger in the structure of the austenitic heat-resistant alloy is 5% or less.
Inventors:
KOCHI NORIFUMI (JP)
MAKI JUN (JP)
NISHIYAMA YOSHITAKA (JP)
MAKI JUN (JP)
NISHIYAMA YOSHITAKA (JP)
Application Number:
PCT/JP2017/000056
Publication Date:
July 13, 2017
Filing Date:
January 04, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C21D8/00; C22C19/05; C22C30/02; C22C38/58; C22F1/10; C22F1/00
Foreign References:
| JPS5610983B2 | 1981-03-11 | |||
| JPS59229468A | 1984-12-22 | |||
| US20080304996A1 | 2008-12-11 | |||
| US20130266477A1 | 2013-10-10 | |||
| CN103774056A | 2014-05-07 | |||
| CN104561821A | 2015-04-29 | |||
| JPH02115348A | 1990-04-27 | |||
| JPH07316751A | 1995-12-05 | |||
| JP2014043621A | 2014-03-13 | |||
| JP2013227644A | 2013-11-07 |
Other References:
ZHOU,D.Q ET AL.: "Precipitate characteristics and their effects on the high-temperature creep resistance of alumina-forming austenitic stainless steels", MATERIALS SCIENCE & ENGINEERING A, vol. 622, 12 January 2015 (2015-01-12), pages 91 - 100, XP029115889
YAMAMOTO,Y. ET AL.: "Alloying effects on creep and oxidation resistance of austenitic stainless steel alloys employing intermetallic precipitates", INTERMETALLICS, vol. 16, no. 3, March 2008 (2008-03-01), pages 453 - 462, XP022500387
See also references of EP 3401415A4
YAMAMOTO,Y. ET AL.: "Alloying effects on creep and oxidation resistance of austenitic stainless steel alloys employing intermetallic precipitates", INTERMETALLICS, vol. 16, no. 3, March 2008 (2008-03-01), pages 453 - 462, XP022500387
See also references of EP 3401415A4
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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