Screw and Barrel for PE, PP,PET 1.Material:38CrMoAlA 2.Treatment:Nitrided/bimetallic/ ... .Customer-made/OEM Screw and Barrel for film blowing machine, extruder, injection machine, recycling machine Specification: For screw: Dia. 15-300 mm Length ... :D2, SKD61, 9Cr18MoV etc.Heat resistant steel:SKH51, GH113 etc.Technical Index: Steel Material38CrMoALA,SKD61.,D2 etc.Hardness after Hardening&TermperingHB240 ...