Roofing Sheet, Galvanized Steel, Galvalume Steel manufacturer / supplier in China, offering ASTM A106 Gr. B Plastic-Coated Steel Pipes with Smooth Inner Surface for Reducing Flow Resistance in Pipeline Systems., En 10210 S275j0/S355j2 Plastic Coated Pipes with Food-Grade Ep Lining for Safe Potable Water Distribution Networks., ASTM A500 Gr. 1/Gr. 2 Plastic Coated Steel Pipes with Durable PE Coating for Water Supply and Drainage Systems. and so on.