Nickel-base alloys are generally less susceptible to metal dusting than steels and the attack is slower.Exposures in strongly carburizing CO-H{sub}2-H{sub}2O mixtures at 650 ℃ and 750 ℃ haveshown, however, gradually increasing attack on the alloys with lower Cr-content. Alloy 600 and even601 were gradually attacked by pitting, whereas for alloys with > 25 % Cr the materials loss wasnegligible even after l0,000h. For these alloys such as 602 CA and 690 the formation of a protectivechromia scale is strongly favored compared to carbon ingress and metal dusting.
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