... corrugated pipe plastic machinery screw and barrel adopts 38CrMoAiA. the machine has the good characteristics of equality plasticizing, stable extruding, high ... output and long life-span. The barrel of the main machine adopts casting aluminum heater , wind cooling , nicety electric control ... , even corrugation,smooth inner and outer pipe wall. Extruder:corrugator:Coiling machine:products:Moulds