制氢装置水分离器入口法兰及三通失效分析

FAILURE OF TEE AND FLANGE OF HYDROGEN PRODUCING SET

应用光学显微镜、扫描电镜、光电子谱、显微硬度仪、铁素体测量仪等对开裂失效试样进行分析．结果表明，三通和法兰开裂失效是由于氢致开裂所致；同时也具有明显的氯化物应力腐蚀破裂敏感性．

Failure samples of tee and flange were examined by using microscope, SEM, XPS, micro\|hardness meter and ferromagnetic meter. The results showed that the crack of tee and flange were attributed to the hydrogen induced crack (HIC), and the samples were sensitive to chloride stress corrosion crack. In the case of environment with high H 2 pressures, hydrogen was the main factor, and work hardening and increasing in stress and hardness at weld zone were inducing factors for the crack of tee and flange. The protective measures are proposed.