Injection screw and barrel material: high quality alloy steel 1)38CrMoALA 2)42CrMo 3)9Cr18MoV 4 ... of injection:30g~30000g,can be matched with corresponded screw heads, distributors,barrels according to customer's requirementDepth of ... : Heat-treatment,Nitriding treatment,Electroplated hard-chrome finish, High-frequency quenching,Bimetallic-alloy coating,Vacuum quenching injection screw and barrel