Selection of stainless steel tubes to minimize hot corrosion in utility boilers

Journal Article · Wed Dec 01 04:00:00 EST 1982 · J. Mater. Energy Syst.; (United States)

DOI:https://doi.org/10.1007/BF02833408· OSTI ID:5941788

Fujikawa, H; Makiura, H

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), Journal Name: J. Mater. Energy Syst.; (United States) Vol. 4:3; ISSN JMSMD
• Country of Publication: United States
• Language: English

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ALLOYS
BOILERS
CHALCOGENIDES
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COMPARATIVE EVALUATIONS
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CORROSION RESISTANT ALLOYS
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
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NICKEL ALLOYS
NIOBIUM
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NIOBIUM ALLOYS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM SULFATES
SODIUM COMPOUNDS
SODIUM SULFATES
STAINLESS STEEL-304
STAINLESS STEEL-316
STAINLESS STEEL-321
STAINLESS STEEL-347
STAINLESS STEELS
STEELS
SULFATES
SULFUR COMPOUNDS
SUPERHEATERS
TITANIUM
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUBES
VANADIUM COMPOUNDS
VANADIUM OXIDES