Abstract
Internal pressure creep rupture strength was investigated on 1·25Cr-0·5Mo, 2·25Cr-1Mo and 9Cr-1Mo steel tubes which had been used for 153 500 h as the high temperature reheater tubes in a power station boiler. The applicability of an Iso-stress method to predict the remaining life was discussed. A linear relationship between the testing temperature and the logarithm of the time to rupture for 1·25Cr-0·5Mo and 2.25Cr-1Mo steels after prolonged service was found. The remaining life for these two steel tubes can be predicted using the Iso-stress method. However, 9Cr-1Mo steel after prolonged service was strengthened at higher temperatures in Iso-stress tests, and the relationship between testing temperature and logarithm of time to rupture was not linear. The strengthening during the Iso-stress tests at higher temperatures was caused by microstructural change of (Cr, Fe) 2N nitrides precipitated during prolonged service.
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