1. Screw and barrel material:38CrMoAL high grade alloy steel and processed surface by nitriding PVC Corrugated Irrigation Pipe Production Line is made by steps of mixing, extrusion, colling, haul-off and drying, etc. Mainly using PVC or PE as main material, the line is used to produce single or double-wall corrugated pipe. This product has the features of light weight, high corrosion resistance, ...