The mechanic properties, lasting strength and microstructural properties of straight and elbow pipesof 12CrMo, 10CrMo910 and 12CrlMoV low alloy steel main steam piping system after long-time service weretested and studied. The testing results showed that, for straight and elbow pipes of mainsteam piping under theconditions of high temperature and high pressure, the numerical operating performance indexes of their metalchanged with little difference, generally both within 5%, and the Values of elbow were higher than those ofstraight pipes. These phenomena proved that the aging processes of pipe metal at different positions are thesame. And the cause for higher numerical performance indexes of elbow and higher failure rate at elbow posi-tion during operation of steam pipes were investigated.
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