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对300 MW机组低温再热蒸汽管道堵板阀表面裂纹原因进行了试验分析。结果表明,堵板阀轴肩部位存在应力集中、材料中存在大量非金属夹杂物、材料老化是造成堵板阀表面裂纹的主要原因。
The cause of crack on surface of 300 MW unit cryogenic reheat steam pipe block valve was analyzed. The results show that there is stress concentration on the shoulder of blocking plate valve, there is a large amount of non-metallic inclusions in the material, and the aging of the material is the main reason for the crack on the surface of the blocking plate valve.