free machining steel

Free machining steel is steel that forms small chips when machined.

However, it still has a good machinability rating on mild steels and free machining steels.

There are four main types of free machining steel: leaded, resulfurized, rephosphorized and resulfurized, and super.

Bismuth achieves a free machining steel by melting into a thin film of liquid for a fraction of a microsecond to lubricate the cut.

Free machining steel costs 15 to 20% more than a standard steel, but this is made up by increased machining speeds, larger cuts, and longer tool life.

Free machining steels are carbon steels that have sulfur, lead, bismuth, selenium, tellurium, or phosphorus added.

In 1938 the company introduced lead-bearing steels to the United Kingdom, and in the 1960s developed free machining steels containing tellurium and an alloy replacement steel.

Aluminium alloys, cold worked steels, and free machining steels, as well as materials with a high shear zone don't tend to form built up edges, so these materials would rank as more machinable.