HY-PRO® CARB Performance Sub-Micrograin Carbide End Mills List HP432, HP434, HP433, HP435: (continued) High Speed Light Milling (Metric) Hardness Up to 20 HRC 20 to 30 HRC 30 to 38 HRC 38 to 45 HRC 45 to 55 HRC Work Mild SteelsMaterialCarbon SteelsAlloy SteelsTool SteelsTi Alloys (Annealed)Hardened SteelsPre-hardened SteelsTi Alloys(Solution Treated and Aged)Hardened SteelsPre-hardened SteelsStainless SteelsInconelNi Based AlloysHardened Steels CuttingSpeed 1,310 SFM 1,150 SFM 820 SFM 490 SFM 260 SFM aa arDepthD<81.5D0.01Dof Cut8