Evaluation of advanced austenitic alloys relative to alloy design criteria for steam service
The results are summarized for a 6-year activity on advanced austenitic stainless steels for heat recovery systems. Commercial, near-commercial, and developmental alloys were evaluated relative to criteria for metallurgical stability, fabricability, weldability, and mechanical strength. Fireside and steamside corrosion were also considered, but no test data were collected. Lean stainless steel alloys that were given special attention in the study were type 316 stainless steel, fine-grained type 347 stainless steel, 17-14CuMo stainless steel, Esshete 1250, Sumitomo ST3Cu{reg sign} stainless steel, and a group of alloys identified as HT-UPS (high-temperature, ultrafine-precipitation strengthened) steels that were basically 14Cr--16Ni--Mo steels modified by various additions of MC-forming elements. It was found that, by solution treating the MC-forming alloys to temperatures above 1150{degree}C and subsequently cold or warm working, excellent metallurgical stability and creep strength could be achieved. Test data to beyond 35,000 h were collected. The ability to clad the steels for improved fireside corrosion resistance was demonstrated. Weldability of the alloys was of concern, and hot cracking was found to be a problem in the HT-UPS alloys. By reducing the phosphorous content and selecting either CRE 16-8-2 stainless steel or alloy 556 filler metal, weldments were produced that had excellent strength and ductility. The major issues related to the development of the advanced alloys were identified and ways to resolve the issues suggested. 89 refs., 45 figs., 8 tabs.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- DOE/FE
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6751647
- Report Number(s):
- ORNL-6629/P1; ON: DE90014765
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
AUSTENITIC STEELS
MECHANICAL PROPERTIES
BOILERS
CHEMICAL COMPOSITION
CORROSION
CRACK PROPAGATION
CREEP
FABRICATION
FOSSIL-FUEL POWER PLANTS
PHASE TRANSFORMATIONS
STAINLESS STEEL-316
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STAINLESS STEELS
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CHEMICAL REACTIONS
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HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
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