The failure analysis of the heating jacket indicates that the austenitic stainless steel 316L is susceptible to stress corrosion cracking under the combined action of chloride environment and residual stresses induced by welding.

• 结果表明：加热夹套开裂的主要原因是316L奥氏体不锈钢不耐氯化物腐性，焊缝有一定的缺陷和腐蚀介质存在，属于一种典型的应力腐蚀失效形式。