Bimetal scerw&barrel

KH1 Barrel: :Fe-based, wear resistant, alloy depth of 1.5-2mm，HRC60±2。

KH3 Barrel: Ni-based alloy, super wearing resistance, alloy depth of 1.5-2mm，HRC40±2。

KH5 Barrel: Ni-based alloy, super wearing resistance and corrosion resistance, alloy depth of 1.5-2mm，HRC45±2。

KH7 Barrel: Co-based alloy, high speed, pressure and temperature(600) resistance, wearing and corrosion resistance, alloy depth of 1.5-2mm，HRC50±2。