1pcs DCMT070204 CBN Hardened/Tool Steel Cutting Carbide Lathe Inserts

Cubic Boron Nitride (CBN) also known as Polycrystalline Cubic Boron Nitride (PCBN) are ideal for cutting hardened tool steel (>HRC40). They have near unparalleled hardness and heat resistance which makes them ideal for cutting hard metals which both generate lots of heat and require high hardness to cut, which a regular carbide either wouldn't cut or would rapidly wear out from heat and friction.

Features:
High hardness and wear resistance, providing long tool life

High thermal stability, allowing for use at high cutting speeds and temperatures. Can tolerate up to 1000 C comfortably and can still retains cutting power at even higher temperatures, though at reduced lifespan

Suitable for cutting hardened tool steel, cast iron and other high hardness ferrous metals.

Good chemical stability, resisting wear and damage from cutting fluids and coolants

When not to use CBN:

CBN is unsuitable for cutting many softer metals, which can be cut equally well or better with cheaper carbide inserts. CBN is designed for hardness and temperature resistance, rather than sharpness, and so will not cut softer metals as well as a sharper, less hard material like uncoated carbide.

- Aluminium and Aluminium Alloys - CBN contains trace amounts of Aluminium Nitride which chemically reacts with aluminium which causes it to bond with the cutter, which both leaves a terrible surface finish and rapidly wears the cutter. For High Performance Aluminium cutting inserts look to uncoated Carbide or PCD inserts.

- Chromium and Chrome Alloys over 20% chromium content - CBN can cut chrome plated steels but pure chromium or alloys with high chromium content will chemically react with CBN to form Chromium Carbide which results in short tool lifespan.

-Uncoated steel carbide insert tipped with Cubic Boron Nitride (CBN), ideal for cutting hardened and tool steel.