... special design for extruder, based on 38CrMoAlA. conical twin screw and barrel for plastic extruder, granulator or ... /75, 45/90, 45/100, 50/105, 55/110, 60/125, 80/143, 80/156, ... nitriding treatment, alloy coating spraying, heating treatment, screw fully hardeningDiameter: Φ45-Φ200(according to the ... various kinds of screw barrels according to the customer’s requirement conical twin screw and barrel for ...