316L不銹鋼板式換熱器使用約半年后頻繁出現泄漏事故，通過掃描電鏡分析、能譜分析、金相檢驗、顯微硬度檢測和有限元模擬分析等方法對泄漏原因進行了分析。結果表明：316L不銹鋼板片發生了應力腐蝕開裂，造成泄漏。板片冷加工后產生了較大的殘余拉應力且環境中存在Cl^-腐蝕介質，導致殘余應力較大的波峰和波谷處產生裂紋和腐蝕坑，是造成板片發生早期開裂的主要原因，而高溫工作環境加速了點蝕的產生及裂紋的萌生和擴展，最終板片發生泄漏。

The leakage accidents of 316L stainless steel plate heat exchanger occurred frequently after using for about half a year. The causes of leakage were analyzed by means of scanning electron microscope, energy spectrum analysis, metallographic examination, microhardness test and finite element simulation analysis. The results show that stress corrosion cracking occurred in 316L stainless steel plate, resulting in leakage. Large residual tensile stress and Cl^- corrosion medium existed in the environment after cold working, leading to cracks and corrosion pits at the wave crest and valley with large residual stress, which were the main reason for the early cracking of plate. High temperature working environment accelerated the generation of pitting corrosion and the initiation and propagation of cracks, and finally the plate leaked.