Steel pipeline corrosion is mainly divided into two categories: internal corrosion and external corrosion.

External corrosion is mainly caused by corrosion caused by the connection between the pipeline material and the external environment such as soil, seawater, atmosphere, and other corrosive media. At the same time, because some pipelines have an insulation layer on the outside, water may accumulate under the insulation layer due to other factors. The accumulation (sometimes also due to the heating of external moisture due to the high temperature of the medium in the pipe) creates a highly corrosive corrosion area, causing corrosion under the insulation layer of the pipeline.

Internal corrosion, the types of internal corrosion that occur vary depending on the properties of the fluid in the pipeline. Including acid corrosion, corrosion caused by chloride ions, microbial corrosion, stress corrosion, welding corrosion, etc.