Microstructure, properties and welding of T24 steel - Critical review

Abstract

In this paper a new bainitic 7CrMoVTiB10-10 (T24) steel has been described on the basis of our own research results and a review of relevant literature. The T24 creep-resistant steel is known to be intended for membrane walls in power-generation units operating at supercritical steam parameters. Chemical composition, thermal treatment, microstructure and mechanical properties of T24 steel were characterized. Moreover, the processes of microstructure degradation during ageing/creeping and their effects on mechanical properties have been shown. Weldability of T24 steel and the problems connected with cracking of its homogeneous joints, as well as the methods of preventing them, are given in the paper.