conical twin screw and barrel

conical twin screw and barrel bimetallic screw and barrel Technical index: 1)Depth of nitration case:0.4-0.7mm 2)Hardness of nitration:850-1000 3)Roughness of the surface:Ra 0.4μm 4)Screw straightness: 0.015mm/m 5)hardness of the double alloys:HRC56-65 6)Fully hard screw(wear-proof, corrosion-proof, heatproof, high-pressure proof and high-speed proof):HPT1 HPT2 HPT3 7)depth of the double alloys :0.8-2.0mm 8)fragility of nitration:<grade 2