The Estimation Of Microstructure And Properties For 10CrMo910 Main Steam Pipes After 150 Thousand Hours' Running

The developments of main stream pipes in power plant were summarized in the article. Watchful problems and the steps to be likely adopted of the main stream pipes which being used in power plants were brought forward. The two 10CrMo910 refractory main stream pipes have worked for 146967 hours were studied in this article. To get the microstructure and properties of the 1~# and 2~# main pipes of the 4th set, many ways were taken just like: chemical components analysis, normal and high temperature mechanics properties testing, metallographic analysis, SEM analysis, electronic probe analysis and TEM analysis. The results show that because of the gathering of carbide of Cr and Mo in the boundary, the pipes' hardness increase, the strike toughness decrease, a few creep cavities were also found in the grain and boundaries, which leads to the creep cracks.In the course of the research, the carbide structure and the distributing of carbides and the alloy element re-distributing and the permanent strength were observed, and the research datum can be taken as the foundation in both theoretics and practice in the metal intendance.The author thought that in the practice application, in metal intendance, the economic benefit can't be put in the first place, safe work is the most important thing. We should take all this two aspect into account in the metal intendance work.