Selection of stainless steel tubes to minimize hot corrosion in utility boilers
Austenitic stainless steel tubes of AISI 304, 316, 321, and 347 types are sometimes exposed to severe hot corrosion environments in superheaters and reheaters of utility boilers. Hot corrosion depends on the existence of V/sub 2/O/sub 5/ and Na/sub 2/SO/sub 4/ in the oil-fired boilers, and of Na/sub 2/SO/sub 4/ and K/sub 2/SO/sub 4/ in the coal-fired boilers. Among various kinds of ash corrosions, the alkali sulphate-side corrosion has been mainly studied. Type 347 steel better resistance to alkali sulphate-side corrosion than 304, 316, and 321 steels. Alloying with Nb was more effective than Mo or Ti. A (Cr, Fe, Ni)-spinel oxide layer with little ash content formed at the scale-metal interface in 347 steel. In field tests, 347 tubes have maintained good resistance to both fire-side and steam-side corrosion for five years. However, 321 tubes were removed after three years of service, because of severe fire-side corrosion.
- Research Organization:
- Central Research Laboratories, Sumitomo Metal Industries, Ltd, No. 1-3, Nishinagasu hondori, Ama-gasaki
- OSTI ID:
- 5941788
- Journal Information:
- J. Mater. Energy Syst.; (United States), Vol. 4:3
- Country of Publication:
- United States
- Language:
- English
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BOILERS
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STAINLESS STEEL-304
CORROSION RESISTANCE
STAINLESS STEEL-316
STAINLESS STEEL-321
STAINLESS STEEL-347
COMPARATIVE EVALUATIONS
HIGH TEMPERATURE
MOLYBDENUM
NIOBIUM
POTASSIUM SULFATES
SODIUM SULFATES
SUPERHEATERS
TITANIUM
VANADIUM OXIDES
ALKALI METAL COMPOUNDS
ALLOYS
CHALCOGENIDES
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
METALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
SODIUM COMPOUNDS
STAINLESS STEELS
STEELS
SULFATES
SULFUR COMPOUNDS
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM COMPOUNDS
421000* - Engineering- Combustion Systems
200101 - Fossil-Fueled Power Plants- Cooling & Heat Transfer Equipment & Systems