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The composition of steel and alloying elements is discussed in a seperate question on the properties of steel. The higher the carbon content of steel, the lower the machinability. The hardness is also of primary importance. Conventional tools can be used to 45 HRC. Up to 68 HRc carbide tools and inserts specially designed for this purpose can be used. Above this hardness CBN and ceramic tools find limited use; grinding and EDM methods are other alternatives.
The structure of steel is important as well. Wrought, rolled and extruded steel, particularly if subsequently surface machined and annealed, will be somewhat easier to cut. Castings and compacted forgings, which often contain non-metallic inclusions (Sand, aluminum oxide) or have surface skin, can prove difficult to machine.
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