摘要
某石化公司的加氢裂化装置热高分气混合氢换热器入口注水线阀门的阀体出现开裂。通过宏观观察、金相检验、材质分析、电镜观察等手段进行了检测分析,结果表明,阀体断裂的主要机制为淬火断裂和疲劳断裂;发生断裂的主要原因是由于阀体内的夹杂物含量较高,在加工过程中冷却速度过快造成淬火裂纹;而后,由于管线的振动,产生交变载荷,使其发生疲劳断裂,导致最终的宏观裂纹。
In the hydrocracking unit of a petrochemical company, valve body cracking was present on the water injection line of heat exchanger for hot high-pressure separator gas and recycled hydrogen. The cracking was detected and analyzed with the methods of macro observation, metallographie examination, material analysis and electron microscope observation. The results reveal that main mechanism for the cracking contains two parts of quenching fracture and fatigue fracture, and high content of inclusion in the valve body is the main reason that results in the fracture. Quenching fracture was brought about by excessive cooling speed in the course of processing, and then fatigue fracture was incurred by the alternating load due to the vibration of pipeline, which leads to the final macroscopic crack.
出处
《石油化工腐蚀与防护》
CAS
2016年第5期58-60,共3页
Corrosion & Protection In Petrochemical Industry
关键词
加氢裂化
阀体开裂
淬火裂纹
疲劳开裂
Hydroeracking unit, Valve body cracking, Quenching fracture, Fatigue fracture
