... steelTechnology: Nitriding treatment, alloy coating spraying, heat-treatmentAppliance: PVC, PP, PE, PA, PC, ABS, AS etcDepth of ... and welding methods for the screw of different functions.Materials38CrMoAlA (JIS SACM645)SKD61 .etcApplication PS,HIPS,ABS,SAN,EPN/LDPE,HDPE,UHMPE,EVA,PP,PVC ... Chinaplas exhibition : Lucheng screw machinery factory PP PE PVC PETplastic extruder machine pin screw barrel