Materials You are here: Shop / Milling Cutters / Materials Aluminium < 10% Si Aluminium > 10% Si Copper / Copper Alloys, Brass, Bronze Thermo Plastics Graphite Low Carbon Medium Carbon, Alloy Wheels Die / Tools Steels Grey cast iron (GG) <180HB Malleable Cast Iron (SG) 180>260HB Free Machining Austenitic, Martensitic, PH Stainless Cobalt Chrome Alloys, Super Duplex 25%, Duplex 22% High Temp Alloys Titanium Alloys Hardened Steels 50>55 HRC Hardened Steels 55>60 HRC Hardened Steels 60> HRC