Abstract
Using temperature as a pitting criterion, a critical pitting temperature has been defined for molybdenum-bearing austenitic stainless steels containing nominally 18% Cr which provides a quantitative measure of their pitting resistance. Single phase alloys had increasing resistance to pit initiation with increasing Mo content while the performance of duplex alloys was limited by the presence of Mo-rich second phase. The effects of heat-treatment and alloy additions on microstructure and pitting resistance are discussed Résumé Une température critique de piqûre a été définie pour des aciers austénitiques au molybdène contenant 18% de chrome. Ceci fournit une mesure quantitative de leur résistance à la piqûre.La teneur en molybdène augmente la résistance au début de piqûre alors que la performance des alliages duplex est limitée par la présence d'une deuxième phase riche en molybdène.
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