PVC Coated Steel Pipes, also known as coated pipes, steel-plastic composite pipes, or plastic-coated steel pipes, are steel pipes with a plastic anti-corrosion layer fused onto their inner surface by spraying, rolling, dipping, or absorption methods, or with a plastic anti-corrosion layer fused onto both inner and outer surfaces. These coated steel pipes offer excellent corrosion resistance and low frictional resistance. Epoxy resin coated steel pipes are suitable for conveying water supply and drainage, seawater, warm water, oil, and gases, while polyvinyl chloride coated steel pipes are suitable for conveying drainage, seawater, oil, and gases.