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Grooving Corrosion of Electric Resistance Welded Steel Pipe In Water: Case Histories and Effects of Alloying Elements

In view of the increased frequency of grooving corrosion in electric resistance welded(ERW)steel pipes used for water pipes, case histories and factors affecting its occurrence have been investigated. Two types of grooving corrosion are observed in 68 case studies of troubled pipes, the continuous and discontinuous types. The latter is associated with tuberculation, deep penetration being limited to the weld area covered by tubercles. The penetration rate is 2.Smm/y (lOOmpy) in average and 9.5mm/y (380mpy) at maximum, corresponding to 25 and 80 times, respectively, that of the overall corrosion rate in water.
There is a general tendency that a high penetration rate is associated with wates of low specific resistance. This type of corrosion occurs not only on the water side but also on the outer surfaces that are in contact with soil or insulating materials soaked with water . The chemistry and manufacture do not seem to affect the susceptibility as far as the commercial products are concerned Since the differences in chemistry and microstructure between the weld and the base metal exist practically in all commercial ERW pipes, there is a potential danger of grooving corrosion.

Product Number: 81075-75-SG
Author: Katsumi Masamura, Iwao Matsushima
Publication Date: 1981
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