YBC251 The substrate with good toughness and high security of cutting edge, in optimal combination with coating composed of MT-TiCN, thick layer of Al2O3 and TiN makes it suitable for steel semi-finishing. TCMT16T308-HR General chipbreaker for roughing with M-level tolerance, it is suitable for both internal and external roughing of materials such as steel, stainless steel, cast iron, etc.1. Thanks to the technology of gradient sintering, impact resistance of cutting edge and wear resistance are improved which lead to improved capability of cutting edge against damage.Carbide with special crystal structure improves the Red Hardness of substrate and strengthens heat resistance of insert. 2. TiCN layer acts against abrasion, which leads to the best wear resistance of the flank. 3. Special structure of Al2O3 deposit layer acts as a thermal barrier and strengthens the capability of substrate against plastic deformation under dry and high-speed cutting conditions. 4. Golden surface of TiN can reduce friction and enable easy distinction of the variety of wear.