Analysis and Prevention of Corrosion of lCrSMo Steel Heater Tubes

The corrosion of the failed tubes of vacuum furnace in atmospheric -vacuum distillation was extensively analyzed via studying metallurgy, work condition,corrosion form, chemical constitution, mechanical character, metallurgical structure and corrosion products. It was found that the corrosion causes of large scale corrosion of tube wall was the naphthenic acid corrosion. It was suggested that one can use resistant materials, high temperature corrosion inhibitor, control the flow rate and pattern to reduce the corrosion.