CBN turning

CBN (cubic boron nitride) is the next hardest material after diamonds.

When properly used, tools made from CBN exhibit considerably less wear than other materials.

Cutting inserts or even VHM tools can be equipped with CBN.

Technical application:

Hardened tool steels with hardnesses greater than 55 HRC or high speed steels (HSS) can be machined without problems using CBN.

Case hardened steels and chilled cast iron can also be machined with CBN.
Non-ferrous metals are totally unsuitable for CBN; diamond tools are needed for these.