Cobalt drill bitsare a combination of steel(or another alloy) mixed with a small percentage of Cobalt, typically between 5-7%. Cobalt has a melting point of 1495 degree and a boiling point of 2927degree, which makes it perfect for use at high temperature. By combing a small amount of cobalt with another alloy. the results are incredible.
Cobalt drill bits are incredibly strong. they can be operated at much higher speeds than a standard HSS drill bit. the ability to withstand heat means that cobalt bits perform for long periods without cooling or the need for cutting fluid.
They are most often used to cut through hardened and abrasive materials. Cobalt bits are able to cut through the most hardened metals, including bronze, cast iron, stainless steel and tinanium, they are also able to cut through weld seams.
The cutting edge on a good quality cobalt bit should last for longer than a standard HSS bits, like oother HSS bits, they are corrosion-resistant, which means they should retain their condition in all storage and usage conditions the are likely to experience. However, cobalt can be brittle, if your cobalt drill bits are not cared or are dropped. they can break-which can prove costly.
