... a special design for extruder, based on 38CrMoAlA. conical twin screw and barrel for plastic extruder, granulator or pelletizer Ruian Yumin machine ... , 92/188, 95/188Material: 38CrMoAlA high quality alloy steelTechnology: nitriding treatment, alloy coating spraying, heating treatment, screw fully hardeningDiameter: Φ45-Φ200(according to ...