38CrMoAIA single screw barrel for injection moulding machine Diameter 12mm-300mm Min.Order 1 set Materials 38CrMoAIA Discount Available Application EVA shoes,caps, plastic hanger ,plastic brush Payment Term T/T, L/C Technical Process 1.Rough Machining 2.Quenching and Tempering 3.Finish Machining 4.Nitriding 5.Screw polishing Technological Parameter Roughness Ra 0.4um Hardness of Quenching and Tempering HB 240-280 Depth of Nitride Layer 0.5~0.8mm...