Three‑cloth four‑oil anti‑corrosion steel pipe belongs to epoxy coal‑tar pitch fiberglass reinforced anti‑corrosion pipeline. The anti‑corrosion structure consists of four coats of epoxy coal‑tar pitch paint wrapped with three layers of glass‑fiber cloth.

The composite coating forms a thick, compact and waterproof protective barrier on the steel pipe surface. It features strong adhesion, excellent water‑resistance, alkali‑resistance, salt‑water resistance and microbial corrosion resistance. It can effectively protect the steel substrate buried underground or underwater from long‑term erosion of soil, groundwater and chemical media.

Spiral‑welded, straight‑seam and seamless steel pipes are available as base materials. The anti‑corrosion grades can also be customized as two‑cloth three‑oil, three‑cloth four‑oil, four‑cloth five‑oil according to different geological corrosion environments.

This product is widely used in sewage discharge, industrial wastewater transportation, buried drainage pipelines, underground municipal pipelines, port and wharf anti‑corrosion engineering and other projects.