Fracture Failure Assessment Analysis and Process Improvement of Vessel Bending Test

Abstract The high-purity ethylene dichloride (EDC) head tower is an important pressure vessel in the vinyl chloride production process. During manufacturing process, bending test of 2 product specimens broke. In this paper, failure analysis fracture welding plate was carried out, and a systematic analysis, including chemical composition, mechanical properties, microstructure, out. causes welded plates during process were studied. results show that incorrect heat treatment leads to extension strength, hardness, impact performance, being lower than standard requirements. combined shows material brittle, which makes board brittle fracture. At same time, metallographic steel tempered. comprehensive performance duplex stainless tempered state significantly original solid solution performance. Thus, equipment caused by improper resulting microstructure not meeting relevant According cause fracture, are improved. out first, then prevent supply from changing. Finally, qualified specimen obtained.