Heat treatment on the corrosion resistance of electric-resistance welded pipe after welding
Electric-resistance welded pipe(short for erw pipe ) can only occur in a specific environment, it also has the following characteristics: (1) Stress corrosion cracking can only occur when stress (especially tensile stress) is present. This stress can be an applied stress, or the residual stress introduced during the welding and joining process, or the expansion stress caused by the wedging action of the corrosion product. (2) Stress corrosion fracture is a time-dependent hysteresis damage, which is completely similar to hydrogen lag cracking. (3) Stress corrosion cracking is a low stress brittle fracture. Stress corrosion cracking is a common cause of failure of the chemical and chemical equipment, especially the erw pipe for oil pipelines. Due to the unpredictability of stress corrosion cracking, it is the biggest hidden danger in the petrochemical industry. The necessary conditions for stress corrosion crac...