Full top PCBN inserts possess excellent hardness and thermal stability and bears 1300 degree of cutting temperature, which is mainly used for machining Hardened Steel with HRC50-60 hardness. For example: carbon tool steel, bearing steel, die steel and high speed steel and so on, gray cast iron, nodular cast iron, chilled cast iron and Ni-baseã?�Co-baseã?�Cr-baseã?�Fe-base high temperature alloy. Insoll Tools supply 3 grades PCBN inserts: ITC10-for high speed machining grey cast iron. Roughing/semi-finishing light interrupted cutting. ITC20-for roughing and semi-finishing cast iron. ITC30-for continuous roughing and semi-finishing cutting high hard steel (HRC 45-65).