Grade CM1C2C3 and C25TN7ALO Grades and Grade Descriptions Small Hole Boring Inserts P Steel Coatings provide high-speed M Stainless Steel capability and are engineered K Cast Iron for finishing to light roughing. N Non-Ferrous S High-Temp Alloys H Hardened Materials wearresistance toughness Coating Grade Description 05 10 15 20 25 30 35 40 45 P Uncoated carbide. A very tough, ultra-fine grain unalloyed substrate. For M general-purpose machining of most steels, stainless steels, high-temperature alloys, K titanium, irons, and non-ferrous materials. Performs best at low speeds and will handle interruptions and high feed rates. Use when C2, C3, or C25 N fail due to chipping or breaking. S HW-S25 M Uncoated carbide. A hard, low binder content, unalloyed WC/Co fine-grained grade. General-purpose grade for non-ferrous materials. Has excellent abrasion resistance K for machining cast irons, austenitic stainless steels, non-ferrous metals, non-metals, N and most high-temperature alloys. S HW-N15 M Uncoated carbide. Has excellent abrasion resistance for machining cast irons, aluminium, and non-ferrous metals. Good wear resistance with some K toughness. Harder than C2, resulting in greater edge wear resistance. Suitable N for finishing operations. S HW-K15 P A highly wear-resistant (TiC/TiN-based) cermet grade. High edge strength and wear-resistant cermet offers improved tool life over uncoated/coated carbides K and resists material build-up on cutting edge. Finishing to semi-finishing of carbon, alloy, and stainless steels at medium to high speeds. Can also be used on non-ferrous materials. HT-P15 P M Coated carbide. CVD — TiCN-TiC-Al2O3. A thin alumina coating over a hard,deformation-resistant substrate. High-speed finishing of grey cast irons andK medium-speed finishing of alloy steels that are in a hardness range of 35–50 HRC. Can withstand light interruptions. Alumina coating enables higher cutting speeds. HC-K15 D38 widia.com