Large-diameter steel pipe is made by coating plastic on the basis of large-diameter spiral welded pipe and high-frequency welded pipe. The maximum pipe diameter is 1200mm. It can be coated with polyvinyl chloride (PVC), polyethylene (PE), and epoxy according to different needs. Plastic coatings with various properties such as resin (EPOZY), good adhesion, strong corrosion resistance, resistant to strong acids, strong alkalis and other chemical corrosion, non-toxic, non-corrosive, wear-resistant, impact-resistant, and strong in permeability , The surface of the pipeline is smooth and does not adhere to any material, which can reduce the resistance during transportation, increase the flow rate and transportation efficiency, and reduce the pressure loss of transportation. There is no solvent and no exudable substances in the coating, so it will not pollute the conveyed介质,以保证纯度和萨尼tation of the fluid. It can be used alternately with cold and hot cycles in the range of -40℃ to +80℃, without aging, It does not crack, so it can be used in harsh environments such as cold regions.

Large-diameter coated steel pipes are widely used in engineering fields such as tap water, natural gas, petroleum, chemicals, medicine, communications, electric power, and oceans.