| | | Grade Designation Milling Gr | Structure ades | Standard Designation | 5 Wear resistance | 4 10 | 1 15 | App 1 20 | icati 25 | on r 30 | nge 1 35 | 1 40 | ► 45 | 0 Toughness | Steel | Stainless steel | Cast iron M a | Non-ferrous metals ® a | Heavy-machining materials o | Hard materials s | Dry machining | Wet machining | |