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Title: Steamside Oxidation Behavior of Experimental 9%Cr Steels

Reducing emissions and increasing economic competitiveness require more efficient steam power plants that utilize fossil fuels. One of the major challenges in designing these plants is the availability of materials that can stand the supercritical and ultra-supercritical steam conditions at a competitive cost. There are several programs around the world developing new ferritic and austenitic steels for superheater and reheater tubes exposed to the advanced steam conditions. The new steels must possess properties better than current steels in terms of creep strength, steamside oxidation resistance, fireside corrosion resistance, and thermal fatigue resistance. This paper introduces a series of experimental 9%Cr steels containing Cu, Co, and Ti. Stability of the phases in the new steels is discussed and compared to the phases in the commercially available materials. The steels were tested under both the dry and moist conditions at 650ºC for their cyclical oxidation resistance. Results of oxidation tests are presented. Under the moist conditions, the experimental steels exhibited significantly less mass gain compared to the commercial P91 steel. Microstructural characterization of the scale revealed different oxide compositions.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
925710
Report Number(s):
DOE/NETL-IR-2008-007
TPR-1955; TRN: US200810%%85
DOE Contract Number:
None cited
Resource Type:
Conference
Resource Relation:
Conference: 5th International Conference on Advances in Materials Technology for Fossil Power Plants, Marco Island, FL, Oct. 3-5, 2007; Related Information: Title in the conference program varies slightly: Steamside Oxidation Behavior of Experimental 9%Cr Ferritic Steels
Publisher:
Electric Power Research Institute, Palo Alto, CA
Research Org:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV
Sponsoring Org:
USDOE - Office of Fossil Energy (FE)
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; AUSTENITIC STEELS; AVAILABILITY; CORROSION RESISTANCE; CREEP; ECONOMICS; FOSSIL FUELS; OXIDATION; OXIDES; POWER PLANTS; STABILITY; STEAM; STEELS; SUPERHEATERS; THERMAL FATIGUE