西固热电厂8、9号炉间主汽母管弯管在1983年8月22日于运行中裂漏。该管在压力100公斤/厘米~2,540℃下共运行13.7万小时,启停约20次。弯管尺寸为φ325×26毫米,直管为φ326×24毫米,材料为12 Cr1MoV。在裂纹弯管宏观和金相观察的基础上进行了形变分析和断口分析,通过应力分析和寿命估算等工作,认为该弯管的断裂为沿晶洞型蠕变断 Xigou Thermal Power Plant 8, No. 9 furnace main steam pipe elbow in the August 22, 1983 in the operation of cracking. The tube at a pressure of 100 kg / cm ~ 2,540 ℃ total operation 137,000 hours, start and stop about 20 times. Bend size φ325 × 26 mm, straight tube φ326 × 24 mm, the material is 12 Cr1MoV. Based on the macroscopic and metallographic observations of the cracked elbows, the deformation analysis and the fracture analysis were carried out. According to the analysis of stress and life expectancy, the fracture of the elbow was considered as the creep of the cave