电动截止阀阀杆断裂原因分析  

Reason Analysis about the Valve-stem Failure of a motor-operated Stop-valve

作　　者：崔丽[1] 崔强[2] 杜世先 

机构地区：[1]哈尔滨锅炉厂有限责任公司,黑龙江哈尔滨150046 [2]哈尔滨理工大学,黑龙江哈尔滨150081

出　　处：《锅炉制造》2001年第4期54-56,共3页Boiler Manufacturing

摘　　要：本文应用化学分析 ,硬度试验 ,脆性试验 ,断口及金相分析方法 ,结合阀门在电厂运行的工作状况 ,对3 8CrMoALA电动截止阀阀杆在运行中断裂的原因进行分析。分析结果认为该阀杆处于非设计的工作状况下 ,阀体内介质流向复杂 ,阀杆受到频繁震动 ,在薄弱部位产生疲劳 。By means of the chemical analysis,hardness test,bittleness test,fibrous fracture and metallographic analysis as well as consiclering operation condition of the valve in power plane,this paper analysed the reason about the valve-stem failure of a 38CrMoALA motor-operated stop-valve.we had following conclosion,because the valve wasing off-design behavior while the direction of the medium stream was very complicated,the valve stem got freqently shock so that the vulnerable area came into fatigue until failure.

关 键 词：阀杆 氮化 疲劳 断裂 锅炉 检验 硬度 金相分析 电动截止阀 

分 类 号：TK226[动力工程及工程热物理—动力机械及工程] TK225