Bimetallic screw barrelBimetallic barrel is a kind of barrels which have be casted a layer of 2-3mm corrosion & abrasion resistant alloy on the inner wall.Specifications:Screw diameter:OD15mm-250mmScrew Length: 300mm-8000mmBarrel outer diameter: OD 40mm-400mmL/D:10-46Bimetallic Alloy Materials:Fe-based alloyNi- based alloy/Deloro alloyCo- based alloyNiCo-based alloyTungsten carbide/Wolfram carbideDouble–alloy levelLevel A – containing Tungsten of 40%Level B – containing Tungsten of 25%Level C – containing Tungsten of 9.5%Techinical ParameterDepth of nitration0.5-0.8mmHardness of nitration950-1020HVStraight of screw0.0015MMFragility of nitrationLess than grade 1Roughness of surfaceRa 0.4umDepth of alloy layer2-3mmHardness of alloyHRC58-62Hardness after hardending and temperingHB260-290Hard chrome plating thickness0.03-0.08mmHardness of hard chrome plating≥950HVCharacteristicsAlloyHarding (HRC)Base materialAbrasion resistanceFe+Ni+Cr+B58-6445/40CrAnti-corrosionNi+Cr+Co+B50-5845/40CrAbrasion resistance & Anti-corrosionFe+Ni+Cr+Co+B56-6445/40CrHigh Abrasion resistance & Anti-corrosionNi+Cr+Wc+Co+B58-6745/40Cr
