The constant progress of machine tools and the increasing production needs require steels particularly apt to machinability for shaving removal. This property is necessary mainly in large mass productions where machines with fully-automatic numerical control are used.
The standard references are:
UNI 10087: free-cutting steels provided as hot rolled;
UNI 10277-3: free-cutting steel bars provided as cold worked.
Interacciai S.p.a trades and commercializes hot rolled and cold worked free-cutting steels.