Abstract
Abstract An alloy for boiling water reactor (BWR) welded pipe applications that is not subject to intergranular stress corrosion cracking (IGSCC) has been qualified for service in high purity high temperature oxygenated water. This alloy provides extra margin against cracking as compared to reference Type 304 stainless steel. Several commercially available alloys were studied in the form of welded 4 inch (10 cm) diameter schedule 80 pipe. Basic resistance to IGSCC was evaluated utilizing cyclic load stress corrosion tests conducted on 4 foot (1.2 m) lengths of welded pipe. Once the basic IGSCC resistance was established, the corrosion fatigue resistance of the alloys was evaluated to verify the adequacy of the ASME Code fatigue design curve. Results of all the testing were analyzed in terms of a model that considers chemical composition, degree of sensitization, stress and phases present. The two optimum alternate alloys were selected.
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