Grade TN30MTN20KTN10UTN15U WIDIA™ VariTurn™ Grades and Grade Descriptions Coatings provide high-speed P Steel capability and are engineered M Stainless Steel for finishing to heavy roughing. K Cast Iron 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 M Coated carbide. MTCVD-TiN-TiCN-Al2O3-TiN. Ideal for general-purpose machining of stainless steels. S HC-M30 P Coated carbide. MTCVD-TiN-TiCN-Al2O3-TiN. Great when used for straight K or lightly interrupted cut applications of ductile and cast irons. HC-K20 P M Coated carbide. PVD-TiAlN-TiN. Ideal for finishing of difficult to machine K alloys and stainless steels. N S HC-S10 P M Uncoated carbide. Excellent abarasion resistance for machining cast irons, K austentic stainless steels, and most high-temperature alloys. N S HW-P15 widia.com B121