DEVELOPMENT OF FERRITIC STEELS FOR HIGH TEMPERATURE SODIUM SERVICE. PART I. 2.25 Cr-1 Mo-0.4 Cb-0.4 Ti EXPERIMENTAL ALLOY
The commercially available ferritic chromium-molybdenum steels have several advantages over austenitic stainless steels. However, they have lower high-temperature strength, tend to decarburize in sodium systems containing austenitic steels, and require post-weld heat treatments. The purpose of this study is to develop a ferritic steel which has strength at 1100 deg F equal to Type 304 stainless steel, resists decarburization in sodium systems, and does not require a complex post-weld heat treatment. In the alloy development program at Atomics International, niobium and titanium are added to conventional chromiummolybdenum high temperature steels. A 2.25% Cr-1% Mo0.4% Nb-0.4% Ti analysis was produced and evaluated. The results on this preliminary heat-of- steel show that the short time tensile, creep, and stress rupture properties are equivalent to Type 304 SS at temperatures at least up to 1100 deg F. In a sodium system this steel was found to be neutral to Type 304 SS with respect to carbon transfer. (auth)
- Research Organization:
- Atomics International. Div. of North American Aviation, Inc., Canoga Park, Calif.
- DOE Contract Number:
- AT(11-1)-GEN-8
- NSA Number:
- NSA-14-015893
- OSTI ID:
- 4155477
- Report Number(s):
- NAA-SR-4832
- Country of Publication:
- United States
- Language:
- English
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