HY-PRO® CARB Performance Sub-Micrograin Carbide End Mills List HP419, HP413: (continued) High Speed Light 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 WorkMaterial Mild SteelsCarbon SteelsCast IronAlloy SteelsTool SteelsTi Alloys (Annealed)Pre-hardenedSteelsTi Alloys(Solution Treated andPre-hardenedSteelsStainless SteelsInconelHardened SteelsHardened Steels Aged) Ni Based Alloys CuttingSpeed 951 SFM 820 SFM 722 SFM 574 SFM 574 SFM 394 SFM Depthof Cut aa arD < 5/320.02D0.05D5/32