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Abstract
The damage phenomena occurring in low-alloy Cr-Mo steels, due to heat treatments and service life at high temperatures, are first reviewed.
The influence of the various parameters (chemical com- position, metallurgical structure, time in critical temperature fields) on the service behaviour at high temperatures is then examined.
Finally, the author illustrates the principle methods of assessing the remanent life of structures and components and the results of investigations carried out on low-alloy steel tubes used in the low- and high-temperature superheaters of two boilers.