USER GUIDE MATERIALS AND GRADES MATERIAL GROUPS Based on ISO 513 and VDI 3323 standards Material Tensile Strength Hardness Group ISO Material Condition [N/mm2] Kc1(1) [N/mm2] mc(2) HB No. < 0.25 %C Annealed 420 1350 0.21 125 1 ≥ 0.25 %C Annealed 650 1500 0.22 190 2 Non-alloy steel and cast < 0.55 %C Quenched and tempered 850 1675 0.24 250 3 steel, free cutting steel Annealed 750 1700 0.24 220 4 ≥ 0.55 %C Quenched and tempered 1000 1900 0.24 300 5 Annealed 600 1775 0.24 200 6 P Low alloy and cast steel (less than 5% of 930 1675 0.24 275 7 alloying elements) Quenched and tempered 1000 1725 0.24 300 8 1200 1800 0.24 350 9 Annealed 680 2450 0.23 200 10 High alloyed steel, cast steel and tool steel Quenched and tempered 1100 2500 0.23 325 11 Ferritic/martensitic 680 1875 0.21 200 12 Stainless steel and cast steel Martensitic 820 1875 0.21 240 13 M Stainless steel and cast steel Austenitic, duplex 600 2150 0.20 180 14 Ferritic / pearlitic 1150 0.20 180 15 Gray cast iron (GG) Pearlitic / martensitic 1350 0.28 260 16 Ferritic 1225 0.25 160 17 K Nodular cast iron (GGG) Pearlitic 1350 0.28 250 18 Ferritic 1225 0.25 130 19 Malleable cast iron Pearlitic 1420 0.3 230 20 Not hardenable 700 0.25 60 21 Aluminum-wrought alloys Hardenable 800 0.25 100 22 ≤12% Si Not hardenable 700 0.25 75 23 Aluminum-cast alloys Hardenable 700 0.25 90 24 >12% Si High temperature 750 0.25 130 25 N >1% Pb Free cutting 700 0.27 110 26 Copper alloys Brass 700 0.27 90 27 Electrolytic copper 700 0.27 100 28 Duroplastics, fiber plastics 29 Non metallic Hard rubber 30 Annealed 2600 0.24 200 31 Fe based Hardened 3100 0.24 280 32 High temperature alloys Annealed 3300 0.24 250 33 Ni or Co Hardened 3300 0.24 350 34 S based Cast 3300 0.24 320 35 Pure 400 1160 0.24 36 Titanium alloys Alpha+beta alloys, 1050 1245 0.24 37 hardened Hardened 4600 55 HRC 38 Hardened steel Hardened 4700 60 HRC 39 H Chilled cast iron Cast 4600 400 40 Cast iron Hardened 4500 55 HRC 41 Steel Stainless Steel Cast Iron Non-ferrous High Temp. and Titanium Alloys Hardened Steel and Cast Iron (1) Specific cutting force for 1 mm2 chip section. (2) Chip thickness factor. 493