Failure Analysis of Water Screen Tube in Steam Boiler

The normal part and the burst part of a burst water screen pipe were examined by macro and microstructure analyses,AES and EPMA.The bursting reason was the bad treatment of water,resulting in the expansion and bursting of the part of the thinned pipe due to the ulcerative corrosion under scale caused by the insufficiency of deoxidization process.SEM analysis did not find material defects.