... (HRc56~65) Roughness of the surface: Ra 0.4μ M Screw straightness: 0.015mm/m Chrome plating thickness: 0.01-0 ... material 38CrMoAIA, welded inlay on the flight, prolong life of screw. Easy wearing parts of barrel feed inlet made from imported ... anti-wear alloy can be improvde abrasion performance. Twin screw and barrel made: CINCINNATI, BATTENFELD, KRUSSMAFFEI, BAUSANO and AMUT model ...