The high nitrogen 20Cr–10Ni–0·7N austenitic stainless steels were produced in a high pressure induction furnace and their hot workability was investigated. The results of torsion and drop hammer tests showed that the optimum temperature range for hot working was from 1350 to 1523 K, suggesting the difficulty in hot rolling. The precipitation of nitrides, which reduced the ductility; occurred below 1350 K. However, calcium treatment or reducing the oxygen and sulphur contents resulted in a marked improvement in hot workability and made hot rolling possible in these high nitrogen stainless steels.
MST/1102
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