TECHNICAL DATA Hardness TECHNICAL DATA CUTTING TOOL MATERIALS The chart below shows the relationship between various tool materials, in relation with hardness on a vertical axis and toughness on a horizontal axis. Today, cemented carbide, coated carbide and TiC-TiN-based cermet are key tool materials in the market, as they offer a good balance of hardness and toughness. Diamond Coating Sintered Diamond Sintered CBN Ceramics Coated Carbide Coated Cermet Coated Micro-grain Cemented Carbide Cermet Coated Cemented Carbide Micro-grain Cemented Carbide HSS Powder HSS HSS Toughness GRADE CHARACTERISTICS Hard Materials Hardness(HV) Energy Formation Solubility in Iron(kcal/g · atom)(%.1250r)* ThermalConductivity(W/m·k)ThermalExpansion(x 10-6/k)Tool Material Diamond >9000 – Highly Soluble 2100 3.1 Sintered Diamond CBN >4500 – – 1300 4.7 Sintered CBN Si3N4 1600 – – 100 3.4 Ceramics AI2O3 2100 -100 i0 29 7.8 CeramicsCemented Carbide TiC 3200 -35 < 0.5 21 7.4 CermetCoated Carbide TiN 2500 -50 – 29 9.4 CermetCoated Carbide P TaC 1800 -40 0.5 21 6.3 Cemented Carbide WC 2100 -10 7 121 5.2 Cemented Carbide * 1W/m • K=2.39×10-3cal/cm • sec • r P042