Hardness (GPa) CBN & PCD Tools CBN Lineup Negative inserts CBN inserts for machining hardened material H chipbreaker series C Unique molded chipbreaker provides excellent chip control when machining hardened material. 3 Chipbreaker styles for a wide range of machining applications. Chipbreaker Application Recommended cutting range HH Hardened steel finishing 1st Recommendation 55HRC or more Small D.O.C. ap = 0.1 ~ 0.3 mm HL Hardened steel finishing55HRC or less HD Removing carburized layer Large D.O.C.From carburized layer to unhardened layerap = 0.3 ~ 0.7 mm MEGACOAT CBN Properties of PVD coating Advantages of MEGACOAT 40 35 30 TiCN Improved Stability 25 TiAIN MEGACOAT 20 TiN 15 Extended tool life High speed 10 400 600 800 1,000 1,200 machining Oxidation temperature (°C) Low Oxidation resistance High Long tool life and stable machining due to superior heat-resistance and hardness. Stability improvement through prevention of crater wear (oxidation, diffusional wear). High thermal stability and surface smoothness provide excellent surface finish. C3