Abstract
INCONEL alloy 625 is a nickel-chromium-molybdenum-columbium alloy used in aggressive corrosive applications where high strength, fabricability, and outstanding corrosion resistance are required. Because of these properties, the alloy is used by the power and chemical industries in a variety of components in coal-fired, nuclear, and chemical process plants. However, widespread use of INCONEL alloy 625 is limited due to its cost. There is a need, notably in utility flue gas desulfurization systems (scrubbers) for an economical, highly corrosive-resistant material. To satisfy this need, INCONEL alloy 625 thin-gauge clad steel plate was developed by Lukens Steel Company. The corrosion resistance of INCONEL alloy 625 in several aggressive corrosive environments will be reviewed. Additionally, this paper will describe methods used to manufacture, fabricate, and weld INCONEL alloy 625 clad plate. Field test evaluation programs conducted at six power plant scrubber systems will also be reported.
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