Cracking Reason and Solution for Head Plate Made of Explosive Welding Stainless Complex Steel Plate

By the inspection of 16 large pressure vessels of explosive welding stainless complex steel plates, amounts of crack were found in 14 vessel heads, the cracking in heads was determined as stress corrosion cracking by macrography, hardness test, optical microscopy, magnetic memory testing, medium component analysis etc. High stress area was in the location where cracking occurred. Under the combined action of the stress and corrosive medium of F^- and Cl^-, stress corrosion cracking in heads occured. High stress in head was analyzed, and large complex steel plate head type choice and crack treatment were proposed.