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97338 HIGH SPECIALTY STAINLESS STEELS AND NICKEL ALLOYS FOR FGD DAMPERS

Picture for 97338 HIGH SPECIALTY STAINLESS STEELS
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Product Number: 51300-97338-SG
ISBN: 97338 1997 CP
Author: W. R. Herda, M. B. Rockel, G. K. Grossmann, K. Starke
Industry: Materials Selection and Design
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Because of process design and construction, FGD installations normally have bypass ducts, which necessitates use of dampers. Due to corrosion from acid dew resulting tlom interaction of hot acidic flue gases and colder outside environments, carbon steel cannot be used as construction materird under these specific conditions. In the past, commercial stainless steels have suffered by pitting and crevice corrosion and occasionally failed by stress corrosion cracking. Only high alloy specialty super-austenitic stainless steels with 6.5 %Mo should be used and considered for this application. Experience in Germany and Europe has shown that with regard to safety and life cycle cost analysis as well as providing a long time warranty, a new specialty stainless steel, alloy 31 - UNS N08031 - (31 Ni, 27 Cr, 6.5 Mo, 0.2 N) has proven to be the best and most economical choice. Hundreds of tons in forms of sheet, rod and bar, m well as strip (for damper seals) have been used and installed in many FGD installations throughout Europe. Under extremely corrosive conditions, the new advanced Ni-Cr-Mo alley 59- UNS N06059 - (59 Ni, 23 Cr, 16 Mo) should be used. This paper describes qualification and workability of these alloys as pertains to darnper applications. Some case histories are also provided. Keywords: Damper, FGD, localized corrosion, super-austenitic stainless steels, alloy 31 (UNS N0803 1), nickel alloys, alloy 59 (UNS N06059), damper references.
Because of process design and construction, FGD installations normally have bypass ducts, which necessitates use of dampers. Due to corrosion from acid dew resulting tlom interaction of hot acidic flue gases and colder outside environments, carbon steel cannot be used as construction materird under these specific conditions. In the past, commercial stainless steels have suffered by pitting and crevice corrosion and occasionally failed by stress corrosion cracking. Only high alloy specialty super-austenitic stainless steels with 6.5 %Mo should be used and considered for this application. Experience in Germany and Europe has shown that with regard to safety and life cycle cost analysis as well as providing a long time warranty, a new specialty stainless steel, alloy 31 - UNS N08031 - (31 Ni, 27 Cr, 6.5 Mo, 0.2 N) has proven to be the best and most economical choice. Hundreds of tons in forms of sheet, rod and bar, m well as strip (for damper seals) have been used and installed in many FGD installations throughout Europe. Under extremely corrosive conditions, the new advanced Ni-Cr-Mo alley 59- UNS N06059 - (59 Ni, 23 Cr, 16 Mo) should be used. This paper describes qualification and workability of these alloys as pertains to darnper applications. Some case histories are also provided. Keywords: Damper, FGD, localized corrosion, super-austenitic stainless steels, alloy 31 (UNS N0803 1), nickel alloys, alloy 59 (UNS N06059), damper references.
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