Analysis of Busrting Cause of Large Cylinder Casing
The busrting cause of a 20CrMoV valve casting for main steam valve during hydrostatic pressure test was analyzed by metallographic analysis, fracture analysis, chemical analysis and mechanical property test. The results show that the direct reasion for bursting of the valve casting is non-clearing crack and weld crack after repair welding on the internal wall of valve casting, and the indirect reason is the poor inner quality of valve casting.