Effect of Ni and B on the Hot Workability of High Mo Austenitic Stainless Steels

Effects of Ni content and B addition on the hot workability of austenitic stainless steels containing 4.56.2%Mo for sea water applications have been investigated by hot tensile tests and physical analyses of fractured surfaces. Optimum Ni contents were 22% for 25Cr-4.5Mo steel and 17% for 20Cr-6.2Mo steel respectively, since 34% δ ferrite remaining in the solidification structure was effective to improve the ductility at temperatures between...