... used in extruders,injection molding machine,rubber processing machine,other plastic rubber machine conical¶llel twin screw barrel for rubber &plastic machine Product name:injection / extruder machine/screw barrel/conical ... barrel,bimetallic screw barrel,extruder screw barrel,screw barrel for injection molding machine,conical or parallel screw barrel,Material:38CrMoAlA,SKD11,SKD61 ...