Parallel twin screw barrelbased Material: 38CrMoAlA, SKD61 etc. Treatment: Nitriding, Bimetallic sprayingDepth of Nitrated Layer: 0.5 - 0.8 mmHardness: 58 - 72 HRCFragility of nitration: Less than grade1Surface roughness: Ra 0.4umThickness of Bimetallic layer: 2 - 4 mmAs a professional manufacturer and supplier of screw barrel, we can make any specifcation of screw barrel for Haitian, Demag, Engel, Klauss maffei, Nigro bossi, Arburg, NPM, BOY, Husky, Fanuc, Billion, Sumitomo, Nippon Steel, Nissei, Toshiba, Mitsubishi.