... high quality 3Processed to drawing or buyers request Alloy steel conical twin screw barrel for extruder machineSpecification:35/76, 45 ... 4140Hard chrome coated layer 4Cr5MoSiV1,SKD-61,SKD-11Spraying bimetal alloy layer and nitriding treatment HPM38,SI36,SUS440,9Cr18MoV high ... type, double screen type, shunt type, separation type, exhaust type, pin type, mixed type, double- head type, three-head type, ...