Coated steel pipes are products that utilize PE (modified polyethylene) for hot dipping galvanization or EP (epoxy resin) for both internal and external coating, boasting excellent corrosion resistance. The coating itself also offers good electrical insulation and does not cause electrolytic erosion. They have low water absorption rates, high mechanical strength, and a low friction coefficient, enabling long-term use. They can also effectively prevent damage from plant root systems and soil environmental stress. They feature easy connection and simple maintenance.