Abstract
The creep-rupture behaviour of nitrided 20Cr/25Ni/Nb/1.5Ti stainless steel has been studied in environments of iodine vapour, air and vacuum under initial applied stresses 138–310 MN/m 2 at 750°C. Iodine vapour reduced the times to failure compared with vacuum or air over this stress range, but only reduced the failure strain in tests lasting > 100 h. The secondary creep rate remained unaffected by the test environment. The results are compared with creep-rupture data obtained previously on 20Cr/25Ni/Nb stainless steel in the same test environments.
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