Inner and outer epoxy coal‑tar pitch anti‑corrosion steel pipe adopts double‑sided anti‑corrosion treatment. Both the inner wall and outer wall of the steel pipe are coated with epoxy coal‑tar pitch paint. Fiberglass cloth can be added to form reinforced structures such as one‑cloth two‑oil, two‑cloth three‑oil, three‑cloth four‑oil.

The anti‑corrosion coating forms a compact waterproof protective layer on both sides of the pipe. It features excellent acid‑resistance, alkali‑resistance, salt‑water resistance and anti‑microbial performance. It can resist corrosion from internal sewage, industrial wastewater and external underground soil simultaneously.

Spiral‑welded, straight‑seam and seamless steel pipes are optional as base materials. Different inner‑wall and outer‑wall anti‑corrosion grades can be customized separately according to medium property and geological corrosion condition.

All finished steel pipes pass coating‑thickness test, adhesion inspection and visual check before delivery. It is widely used for sewage treatment, industrial wastewater transportation, buried drainage pipelines, chemical fluid conveyance and other projects requiring both‑sides anti‑corrosion protection.