Abstract
In this paper, the failure analysis was conducted on a non-occupation refined-oil pipeline, in which corrosion perforation occurs when the pipeline was filled with 1.2 MPa air for more than 1 year, and the material of the corrosion pipeline was L245. To find out the reason of the corrosion, some tests such as XRD analysis for corrosion products, corrosion pits analysis, inclusions and microstructure inspection, as well as corrosion simulation trial were conducted. The experimental results showed that the failure was caused by electro-chemical corrosion because of the dissolved oxygen, while the existence of 1.2 MPa inner air and non-metallic inclusions accelerated the corrosion.
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