Abstract
Cast austenitic stainless steel grade CF8C of ASTM A351 possesses varying degrees of suitability for services both at high temperatures and in corrosive environments. CF8C contain Nb of 1% max as per ASTM A351, i.e. 8 times the carbon content. Unlike CF8M and CF3M of ASTM A351, CF8C grade has option for stabilization treatment due to Nb present which forms carbides, between 870 and 900 °C after solution annealing in austenite matrix. This prevents depletion of chromium around grain boundary and prevents sensitization of steel. However, this stabilization treatment has been mentioned as supplementary requirement of ASTM A351 Clause 3.1 depending on the end property requirement. In this line, experimentation carried out on solution annealing and solution annealing + stabilization treatment of CF8C grade and testing carried out in order to evaluate properties after both treatments. For other stainless steels like CF8M, and CF3M of ASTM A351 similar experiment carried out.
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