Burst failure analysis of a gas cylinder

A seamless steel cylinder filled with oxygen exploded during the hydraulic test. In this paper, the microstructure, wall thickness, chemical composition and mechanical properties of gas cylinders are tested and analyzed. The results are in accordance with the relevant standards. However, in the macro analysis of the gas cylinder, it is found that there are linear defects at the fracture surface, the cylinder is corroded seriously and there are a lot of circular block at the bottom of the cylinder. The comprehensive analysis results show that, the defects in the manufacturing process and oxygen corrosion in the use process are the main reasons for the cylinder rupture in the process of hydraulic test.