Reason Analysis on Bursting of Manhole Cover of 316L Stainless Steel

The bursting reason of manhole cover of 316L stainless steel was analyzed by means of chemical composition analysis, macro and micro examination, corrosion product analysis. The results showed that manhole cover bursted due to stress corrosion. The reason of stress corrosion was that there would be strong residual stress in hemispherical manhole cover by cold pressing, while stress with cyclical change also existed in the working condition.