Abstract
A number of ferritic and austenitic stainless steels were exposed at temperatures of 900 to 1200 F for periods up to 34,000 hr. Microstructure of the weld heat-affected zone and parent metal, tensile and creep rupture properties of the parent metal are discussed. The tensile properties at ambient temperature of several steels were changed after exposure for 10,000 hr. The creep rupture strength at 900, 1050, and 1200 F in certain steels was changed after 10,000 hr exposure at the elevated temperatures. Ductility in rupture tests of the ferritic steels increased and in the austenitic steels decreased when compared with the tension test results at ambient temperature. Sigma was observed in all the ferritic steels except 12 Cr free machining (FM) and possibly 12 Cr-Al after 34,000 hr exposure at 1200 F. Sigma was observed after exposure at 1200 F in all the austenitic steels except 25 Cr-12 Ni which was only exposed for 5000 hr.
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