Flutes have a low helix angle to provide the cutting forces required for difficulttomachine material, such as tool steel, hardened steel, and iron. Carbide Ball End Mills for Stainless Steel and Titanium . With a wearresistant titaniumaluminumnitride (TiAlN) coating, these end mills provide excellent shearing and chip removal in stainless steel and titanium. Carbide Ball End .