Corrosion in quench systems of entrained slagging gasifiers: a laboratory study. Final report. [1 1/4Cr-1/2Mo(T-11)]
The objective of this program was to conduct laboratory autoclave tests simulating environments of the gray water system of an entrained slagging gasifier plant. Five tests (one 200-h and four 1000-h) were conducted using ferritic steel material 1 1/4Cr-1/2Mo (T-11) and 14% silicon cast iron; austenitic stainless steels 304L, 316, 321, and Sanicro 28; duplex stainless steel 2205; and Incoloy 825. In the vapor phase with autoclave solution pH in the 4.5 to 4.8 range, 304L SS, 316 SS, 321 SS, and Incoloy 825 double U-bends suffered significant intergranular SCC. Some crevice-assisted cracking is suspected. Pitting corrosion, as measured by maximum pit depth, may become serious since the rate of growth is not known. At the pit base, preferential dissolution was identified similar to grain- and twin-boundary preferential corrosion. General corrosion of the stainless steels was low, but T-11 and 14% silicon cast iron cannot be used unprotected. High acidic pH (6.2 and 6.4) and lower total chloride levels eliminated SCC problems and reduced pitting and corrosion. Of the two phases in a quench system, the vapor phase poses more danger to the materials of construction, particularly to the internal attachments and extensions where welding is required. 13 refs., 31 figs., 4 tabs.
- Research Organization:
- IIT Research Inst., Chicago, IL (USA)
- OSTI ID:
- 6508011
- Report Number(s):
- EPRI-AP-4344; ON: TI86920059
- Country of Publication:
- United States
- Language:
- English
Similar Records
Stress corrosion cracking of candidate waste container materials; Final report
Survey of degradation modes of candidate materials for high-level radioactive-waste disposal containers
Related Subjects
36 MATERIALS SCIENCE
CAST IRON
CORROSION
CHROMIUM-MOLYBDENUM STEELS
COAL GASIFICATION
BENCH-SCALE EXPERIMENTS
MATERIALS TESTING
INCOLOY 825
STAINLESS STEEL-304L
STAINLESS STEEL-316
STAINLESS STEEL-321
AUTOCLAVES
COAL GASIFICATION PLANTS
ENTRAINMENT
EXPERIMENTAL DATA
PH VALUE
PITTING CORROSION
QUENCHING
SIMULATION
STRESS CORROSION
ALLOYS
CARBIDES
CARBON COMPOUNDS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COPPER ALLOYS
CORROSION RESISTANT ALLOYS
DATA
GASIFICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY ALLOYS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
IRON CARBIDES
IRON COMPOUNDS
MATERIALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NUMERICAL DATA
STAINLESS STEELS
STEELS
TESTING
THERMOCHEMICAL PROCESSES
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
010404* - Coal
Lignite
& Peat- Gasification
360105 - Metals & Alloys- Corrosion & Erosion