PCBN用于加工难切削的黑色金属材料，如淬硬钢、粉末冶金零件、耐热合金和铸铁。在日本，超过50%的市场PCBN用于切割通过磨削加工的硬化钢制成的汽车零件或机械零件，因为硬车削具有多种好处，如成本降低、加工效率、灵活性或自动化。本文介绍了各种PCBN硬车削刀具的切削性能及实例。

PCBN IS USED TO MACHINE DIFFICULT-TO-CUT FERROUS MATERIALS SUCH AS HARDENED STEEL, P/M PARTS, HEAT RESISTANT ALLOY, AND CAST IRON. IN JAPAN, MORE THAN 50% OF THE MARKETED PCBN CUTS AUTOMOTIVE PARTS OR MACHINE PARTS MADE OF HARDENED STEEL WHICH HAD BEEN MACHINED BY GRINDING, AS HARD TURNING HAS MANY KINDS OF BENEFITS SUCH AS COST REDUCTION, MACHINING EFFICIENCY, AND FLEXIBILITY OR AUTOMATION. THIS PAPER INTRODUCES THE CUTTING PERFORMANCE AND EXAMPLES OF VARIOUS KINDS OF PCBN TOOLS FOR HARD TURNING.