Determination of Life of Steel Pipes Used in Thermal Power Plants
Bünyamin ÇİÇEK Yavuz Sun Hayrettin Ahlatçı Yunus Türen
Abstract—In the aim of this study; the determination of life in steel materials used in different temperature conditions in thermal power plants has been conducted. In these systems, basic steels with low C levels are use at low temperatures and Cr-Mo added special series steels are use at high temperatures. In cases where the creep resistance is of great importance, the choice of material according to the level of creep resistance comes to the fore. In the industry, non-destructive testing methods have been develop in order to conduct investigations in the actively working systems. There are many volumetric and superficial tests in welded joints. In the non-destructive tests carried out on the material, with replica microstructure copying and mobile measurements come to the fore. In this study, the determination of life of ASTM SA192 quality steel materials, which a reactive at low temperatures, has been studied. Replica microstructure was replicate through a working system and the images were compare according to the first material. Because of this comparison, changes in material microstructure were determined as grain growth. Hardness and thickness values obtained by mobile devices were also exam according to the first material. As a result, 338C temperature and 39 bar internal pressure in the working material, because of 140000 hours, a 17% reduction in thickness and hardness (HB) was seen a decrease of 21%.