Specimens of 1.25 Cr–0.5 Mo steel which had been exposed for prolonged times at 1000 F under ASME Boiler and Pressure Vessel Code allowable stresses were rupture tested in order to evaluate the influence of service on subsequent elevated-temperature properties. Specimens were tested as-removed from service and after reheat-treatment. The prolonged service drastically reduced short-time rupture properties but did not have any significant influence on the expected long-time rupture strength. Reheat-treatment restored the short-time strength to a high level.

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