Failure Analysis of Superheater Welding Boss of Ethylene Cracking Furnace

The leakage causes of ethylene cracking furnace were investigated by chemical composition analysis, SEM, metallographic analysis and other methods. The results showed that the cracking was brittle cracking. Material and mechanical properties imperfection, loading and stress corrosion cracking were the key factors. Some countermeasures were put forward to prevent the failure recurrence.