Failure Analysis on Rupture Explosion of a Steel Cylinder for Carbon Dioxide

A rupture explosion accident of a 37Mn seamless steel cylinder occurred in a gas company. Through the site investigation and macro analysis, wall thickness measurement, chemical composition analysis, mechanical property testing, metallographic examination, fracture analysis and so on, the reasons for the rupture explosion of the steel cylinder were analyzed. The results show that:the stress corrosion cracking happened on the inner wall of the steel cylinder; under the action of internal pressure together with the collision and vibration during the transport process, the pressure bearing capacity of the steel cylinder was insufficient, and finally the physical rupture explosion happened to the steel cylinder. Finally, the preventive measures were put forward according to the failure reasons.