... from kneader.Barrel screw use 38CrMoAlA quality alloy steel, nit riding treatment, high hardness, wear resistance to corrosion. ... from kneader.Barrel screw use 38CrMoAlA quality alloy steel, nit riding treatment, high hardness, wear resistance to corrosion. ... .Pelletizing granulation line for low smoke halogen free flame retardant materials including the following single machines:1.disperison ...