立方氮化硼（cBN）具有高导热性和高硬度，仅次于金刚石，相对于黑色金属材料而言相对惰性。因此，通过将cBN粉末与粘结剂材料烧结而成的PCBN（多晶cBN）压块已被用作主要在汽车工业中切削铸铁和硬化钢的工具。近年来，为了应对汽车零部件行业的发展趋势，人们越来越需要对铁和淬硬钢进行高效加工。新技术、PCBN压块的改进和新的刀具设计显著提高了加工效率。

Cubic boron nitride (cBN) has high thermal conductivity and high hardness second only to diamond, and is relatively inert with respect to ferrous materials. Consequently, PCBN (polycrystalline cBN) compacts, fabricated by sintering cBN powder with binder materials, has been used as tools for cutting cast iron and hardened steel mainly in automobile industries. In recent years, in response to trends in automotive parts industries, there is a growing need for high efficiency machining of iron and hardened steel. The new technologies, the improvement of PCBN compacts and the new tool design, increase the machining efficiency remarkably.