Development of a new heat resistant austenitic stainless steel ``NAR-AH-4'' for power generation equipment
New austenitic stainless steel, NAR-AH-4, which consists of low Si-23 mass %Cr-11.5 %Ni-0.2%N-B-REM (Rare Earth metal) has been developed for the application of high temperature components (up to 1,000 C) in thermal power plants and chemical plants. The corrosion and erosion resistance of developed steel with high content of chromium and slight amount of REM is excellent in forming adherent chromia oxide film on a surface. The creep rupture strength is considerably higher than that of Type 310S(24Cr-20Ni) and Alloy 800H(20Cr032Ni-Al,Ti) due to the addition of nitrogen and boron. The resistance to weld hot cracking sensitivity of this steel is better than Type 310S and high silicon content (0.3%) and optimum ratio of chromium equivalent to nickel equivalent. In addition, this steel has an economical advantage over Type 310S and Alloy 800H. These results indicate that this steel is expected to be widely utilized as a candidate material for high temperature components.
- Research Organization:
- Ishikawajima-Harima Heavy Industries Co., Ltd., Tokyo (JP)
- OSTI ID:
- 20014135
- Resource Relation:
- Conference: 1999 International Joint Power Generation Conference, Burlingame, CA (US), 07/25/1999--07/28/1999; Other Information: PBD: 1999; Related Information: In: Proceedings of the 1999 international joint power generation conference (PWR-Vol. 34). Volume 2: Power, by Penfield, S.R. Jr.; Hayes, R.H.; McMullen, R. [ed.], 752 pages.
- Country of Publication:
- United States
- Language:
- English
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