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A series of high-purity iron-chromium-nickel alloys, made to a base analysis of 18 per­ cent of chromium and 10 percent of nickel, and with carbon ranging from 0.007 to 0.30 percent, was melted and solidified in vacuum. The presence or absence of carbides in these alloys after various mechanical and thermal treatments was determined by metallographi c examination. The practical limit of solubility varied from less than 0.007 percent of carbon at 1,300° F to slightly more than 0.077 percent at 1,975° F, the highest temperature studied. The presence of ferrite and/or sigma as stable phases in many of the alloys was established.

Solubility of carbon in 18-percent-chromium 10-percent-nickel austenite