This paper presents the research of the authors did to determine the current state of two steam pipe-lines after 100 000 hours in function at 500°C and 10MPa. Chemical and metallographic analyses, mechanical tests and creep failure tests have been performed. The results of the creep tests were extrapolated by means of Larson-Miller method. The paper presents graphics of results obtained. The behaviour of the studied materials is interpreted from the residual life assessment.
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