AN ENHANCED SUPERAUSTENITIC STAINLESS STEEL OFFERS RESISTANCE TO AGGRESSIVE MEDIA

摘要

Marine applications require construction material to resist harsh environments, but yet must be economical to produce and buy. Alloys such as UNS N06686 or UNS N10276 exhibit excellent corrosion resistance, but at a high price. Other alloys, like those in the 6 percent molybdenum superaustenitic stainless steel (6 percent Mo SS) family are more economical, but sacrifice much of the corrosion resistance of the higher alloyed materials. Thus, an alloy that could approach the corrosion resistance of UNS N10276, but with a price near the 6 percent Mo SS alloys would satisfy both of the requirements for marine service. To meet these requirements, a new superaustenitic stainless steel with enhanced corrosion resistance to both general and localized environments has been developed. Corrosion rates for this new alloy and competitive alloys in seawater, in chloride environments, and other applications relevant to marine service are discussed.