Graphitic Corrosion of a Gray Iron Water-Main Pipe Resulting in a Corroded-Through Hole
A section of cast iron water main pipe contained a hole approximately 6.4 x 3.8 cm (2.5 x 1.5 in.). The pipe was laid in clay type soil. Examination revealed severe pitting around the hole and at the opposite side of the outside diam. A macroscopic examination of a pipe section at the hole area showed that the porosity extended a considerable distance into the pipe wall. Metallographic examination revealed a graphite structure distribution expected in centrifugally cast iron with a hypoeutectic carbon equivalent. Chemical analyses of a nonporous sample had a composition typical of cast iron pipe. Chemical...
Graphitic Corrosion of a Gray Iron Water-Main Pipe Resulting in a Corroded-Through Hole, ASM Failure Analysis Case Histories: Buildings, Bridges, and Infrastructure, ASM International, 2019, https://doi.org/10.31399/asm.fach.bldgs.c0047335
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