Abstract
SA335-P92 steel is a kind of heat-resistant steel with martensitic lath as matrix and multi alloy composite strengthening, which has excellent high temperature performance. It is used for high temperature components of high parameter units in China for nearly 20 years. Many research institutions have done a lot of research on the properties and characteristics of high temperature aging and creep durability in the laboratory, but there are few researches on the micro-characteristics and properties of P92 steel after long-term service. In this paper, the studies are carried on the P92 steel of high temperature reheat steam pipeline taken from the first group of ultra-supercritical units in China. The microstructure characteristics and properties of the material are systematically studied by means of test methods such as micro metallography, scanning electron microscopy, EDS and mechanical properties. It is concluded that although the P92 steel after long-term service still remains the microstructure of martensitic lath, but the toughness greatly reduces caused by large amounts of large scale precipitates at the original austenite grain boundaries and lath boundaries.
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