Corrosion and degradation of test materials in the General Electric GEGAS 25 ton/day coal gasification process development unit
Alloys were evaluated in the GEGAS 25 ton/day coal gasification pilot plant operating at 300 psig (2.1 MPa gauge). The exposure period lasted for approximately 500 h under gasification conditions. Coupons were exposed in the gasifier (below the bottom grate and in the off-gas) and spray-quench vessel. Ferritic alloy 18Cr-2Mo was the best performing alloy (<20 mpy (0.5 mm/y)) in the air-superheated steam (temperature range: 500/sup 0/ to 1000/sup 0/F (260/sup 0/ to 538/sup 0/C)) environment in the ash pit below the grate assembly. Austenitic alloys Types 304 and 316 underwent stress-corrosion cracking. Irregular corrosion and pitting attack were the modes of corrosion for martenstic alloy Type 410, low-alloy steels 5Cr-0.5Mo and 2.25Cr-1Mo, and carbon steel A515. Their corrosion rates were >100 mpy (2.5 mm/y). In the gasifier off-gas test location, alloys Incoloy 800, Incoloy 825, and 20Cb-3 gave the best corrosion performance in the low-Btu product gas. Alloys 18-18-2, 18Cr-2Mo, and Type 321 experienced corrosion losses due to scaling; intergranular corrosion was experienced by Types 304 and 316. Operating temperatures ranged from 1000/sup 0/ to 1200/sup 0/F (538/sup 0/ to 649/sup 0/C). Process conditions were much milder for alloy coupons in the spray-quench vessel during 500 h exposure. High-alloy steels (18-18-2, 18Cr-2Mo, Types 304 and 316) experienced little corrosion at 350/sup 0/ to 400/sup 0/F (177/sup 0/ to 204/sup 0/C) in the vapor phase. The performances of carbon steel A515 and cast iron A278 were unacceptable since corrosion rates were >30 mpy (0.8 mm/y). 13 refs., 11 figs., 7 tabs.
- Research Organization:
- Metal Properties Council, Inc., New York (USA); IIT Research Inst., Chicago, IL (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5505744
- Report Number(s):
- DOE/OR/21400-T150; MPCI-22241-3; ON: DE85012388
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010404* -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
AUSTENITIC STEELS
CARBIDES
CARBON ADDITIONS
CARBON COMPOUNDS
CARBON STEELS
CAST IRON
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
COAL GASIFICATION
COAL GASIFICATION PLANTS
COPPER ALLOYS
CORROSION
DATA
EXPERIMENTAL DATA
FERRITIC STEELS
FUNCTIONAL MODELS
GASIFICATION
GEGAS PROCESS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
INCOLOY 800
INCOLOY 825
INCOLOY ALLOYS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
IRON CARBIDES
IRON COMPOUNDS
MARTENSITE
MATERIALS
MATERIALS TESTING
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NUMERICAL DATA
PILOT PLANTS
STEELS
TEMPERATURE EFFECTS
TESTING
THERMOCHEMICAL PROCESSES
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS