O.S.D. screw barrel Diameter 30mm-250mm Min.Order 1 set Materials 38CrMoAIA 42CrMo(JIS SCM440) 9Cr18MoV CW6Mo5Cr4V2 SKD11,61 GH113 Discount Available Application pp,hdpe, lldpe,ldpe ,recycling Payment Term T/T, L/C, WESTERN UNION Technical Process 1.Rough Machining 2.Quenching and Tempering 3.Finish Machining (4.Nitriding) 5.Spraying and welding with alloy power 6.Screw polishing Technological Parameter Roughness Ra 0.4um ...