HY-PRO® CARB Performance Sub-Micrograin Carbide End Mills List HP434 Side Milling (Fractional) Hardness – Up to 20 HRC 20 to 30 HRC 30 to 38 HRC 38 to 45 HRC 45 to 55 HRC 55 to 60 HRC Hardened Steels Hardened Steels Alloy Steels Pre-hardened Pre-hardened WorkMaterial Cast Iron Mild Steels Tool SteelsCarbon SteelsTi AlloysSteelsTi AlloysSteelsStainless SteelsHardened Steels Hardened Steels (Annealed) (Solution Treated and Inconel Aged) Ni Based Alloys CuttingSpeed 390 SFM 330 SFM 270 SFM 220 SFM 190 SFM 120 SFM 80 SFM Depthof Cut aa ar D<1/81.5D0.05D1/8