Title:
DISPERSION STRENGTHENED AUSTENITIC STAINLESS STEEL, METHOD FOR MANUFACTURING STAINLESS STEEL AND PRODUCT MADE FROM STAINLESS STEEL
Document Type and Number:
WIPO Patent Application WO/2017/073422
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide: an austenitic stainless steel having better radiation exposure resistance and stress corrosion cracking resistance than was conventional while maintaining mechanical properties equal to conventional mechanical properties, and which is low in cost; a method for manufacturing the stainless steel; and a product made from the stainless steel. This dispersion strengthened austenitic stainless steel is characterized by having a chemical composition including 16 to 26 mass% of Cr, 8 to 22 mass% of Ni, 0.005 to 0.08 mass% of C, 0.002 to 0.1 mass% of N, and 0.02 to 0.4 mass% of O, further including at least one of 0.2 to 2.8 mass% of Zr, 0.4 to 5 mass% of Ta and 0.2 to 2.6 mass% of Ti, the remainder consisting of Fe and inevitable impurities. The Zr component, the Ta component and the Ti component form inclusion grains together with the C component, the N component and the O component. The stainless steel has an average crystal grain size of 1 μm or less and a maximum crystal grain size of 5 μm or less.
Inventors:
ISHIZAKI TAKAHIRO (JP)
MARUNO YUSAKU (JP)
MARUNO YUSAKU (JP)
Application Number:
PCT/JP2016/080918
Publication Date:
May 04, 2017
Filing Date:
October 19, 2016
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
C22C38/00; B22F3/10; B22F3/24; C21D6/00; C22C38/50; G21C7/10; G21D1/00; B22F1/052
Domestic Patent References:
| WO2016006280A1 | 2016-01-14 |
Foreign References:
| JP2002256400A | 2002-09-11 | |||
| JP2014080664A | 2014-05-08 |
Other References:
TAKAHIRO ISHIZAKI ET AL.: "Chojumyo Cho Uranium Genso o Nensho Kano na Keisuiro RBWR no Kaihatsu = [Development of light water reactors RBWR capable of burning long lifetime transuranic elements]", 2015 FALL MEETING OF THE ATOMIC ENERGY SOCIETY OF JAPAN, 21 August 2015 (2015-08-21), pages 7, XP009510905
TAKAHIRO ISHIZAKI ET AL.: "Chojumyo Cho Uranium Genso o Nensho Kano na Keisuiro RBWR Ronai Kiki no Kaihatsu (4) Seigyobo-yo Koshosha Kankyoka Taishoku Zairyo no Kaihatsu", 2015 ANNUAL MEETING OF THE ATOMIC ENERGY SOCIETY OF JAPAN, 5 March 2015 (2015-03-05), pages 486
See also references of EP 3369833A4
TAKAHIRO ISHIZAKI ET AL.: "Chojumyo Cho Uranium Genso o Nensho Kano na Keisuiro RBWR Ronai Kiki no Kaihatsu (4) Seigyobo-yo Koshosha Kankyoka Taishoku Zairyo no Kaihatsu", 2015 ANNUAL MEETING OF THE ATOMIC ENERGY SOCIETY OF JAPAN, 5 March 2015 (2015-03-05), pages 486
See also references of EP 3369833A4
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
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