Fireside Fracture and High Temperature Corrosion Cause Analysis of Water Cooled Wall of Ultra Supercritical Generating Set
Meng Dianw · Journal of Chengdu University · 2014
Under water circulation of boiler,the fracture,corrosion,etc. of 15CrMo alloy steel pipes often occur. This paper analyzes the fracture of a 2-year 15CrMo alloy steel pipe in the boiler. The analysis results indicate that pipe wall cracks are single cracks,which are mainly distributed in the high temperature welding areas. On the fireside,corrosion is more serious and organization structure becomes balled,which is regarded as high temperature corrosion. Fatigued cracks under the high temperature occur due to stress concentration in the welding areas.