Delta Ferrite and Martensite Formation in Stainless Steels From studies of 70 chill-cast stainless steel alloy types, nickel- and chromium-equivalents of 13 elements are evaluated for use in a revised Schaeffler diagram

The effects of composi­ tion on delta ferrite and martensite formation were studied in chill-cast experimental stainless steel alloys. Nickel content was varied in each of seventy different alloy types to pro­ duce structures ranging from fully stable austenite to ones containing high percentages of delta ferrite or martensite. The nickel or chromium equivalents of Mn, Mo, Si, V, W, Ti, Cb, Ta, Al, C, N, Co and Cu were evaluated by regression analyses.