Best Coating for Carbide Roughing End Mills on Steel: TiSiN vs AlTiCrN vs Balzers DR (HRC Guide)
Short tool life on steel roughing? Here’s the exact coating you need: GM Series TiSiN for HRC≤40, PM Series AlTiCrN Composite for HRC≤55, HM Series Balzers DR for HRC55-68. Real shop data, side-by-side comparison and 30-second checklist.