Cutting data WALTER PROTOTYP for tapping, thread forming, and thread milling Material group Classification of the main material groups and code l

Cutting data WALTER PROTOTYP for tapping, thread forming, and thread milling Material group Classification of the main material groups and code letters Brinell hardness HB Tensile strength Rm N/mm2 Machining group 1 Tapping solid carbide coated vc ft/min HSS-E (-PM) uncoated vc ft/min HSS-E (-PM) coated vc ft/min 3 Workpiece material p Non-alloyed steel C < 0.25 % annealed 125 428 P1 50 100 E C > 0.25 < 0.55 % annealed 190 639 P2 50 100 E C > 0.25 < 0.55 % heat treated 210 708 P3 40 80 E C > 0.55 % annealed 190 639 P4 50 100 E C > 0.55 % heat treated 300 1,013 P5 150 25 50 E Free cutting steel (short-chipping) annealed 220 745 P6 50 100 E Low-alloyed steel annealed 175 591 P7 50 100 E tempered 300 1,013 P8 165 25 50 E tempered 380 1,282 P9 115 15 25 E tempered 430 1,477 P10 65 5 15 O High-alloyed steel and high-alloyed tool steel annealed 200 675 P11 50 100 E hardened and tempered 300 1,013 P12 165 25 50 E hardened and tempered 400 1,361 P13 100 10 20 O Stainless steel ferritic / martensitic, annealed 200 675 P14 15 35 E martensitic, tempered 330 1,114 P15 5 15 E M Stainless steel austenitic, quench hardened 200 98,000 M1 15 35 E austenitic, precipitation hardened (PH) 300 147,000 M2 10 20 E austenitic / ferritic, duplex 230 112,900 M3 15 25 E K Ductile cast iron ferritic 200 675 K1 130 50 100 E pearlitic 260 867 K2 100 35 65 E Grey cast iron low tensile strength 180 602 K3 150 65 100 E high tensile strength / austenitic 245 825 K4 100 25 50 E Cast iron with spheroidal graphite ferritic 155 518 K5 130 50 100 E pearlitic 265 885 K6 100 35 65 E Cast iron with vermicular graphite 200 675 K7 100 35 65 E N Aluminum wrought alloys can not be precipitation hardened 30 N1 35 50 E precipitation hardenable, precipitation hardened 100 343 N2 50 80 E Cast aluminum alloys < 12 % Si, not precipitation hardenable 75 260 N3 165 50 65 E < 12 % Si, precipitation hardened 90 314 N4 130 50 100 E > 12 % Si, not precipitation hardenable 130 447 N5 100 35 50 E Magnesium alloys 70 250 N6 180 65 100 O Copper and copper alloys (bronze / brass) non-alloyed, electrolytic copper 100 343 N7 15 40 E Brass, bronze, red brass 90 314 N8 165 80 130 E Cu-alloys, short-chipping 110 382 N9 130 65 115 E high-strength, Ampco 300 1,013 N10 40 10 15 E S Heat-resistant alloys Fe-based annealed 200 675 S1 15 25 E precipitation hardened 280 943 S2 10 15 E Ni or Co base annealed 250 839 S3 10 15 E precipitation hardened 350 1,177 S4 5 5 O cast 320 1,076 S5 5 10 O Titanium alloys Pure titanium 200 675 S6 25 25 E Alpha and beta alloys, precipitation hardened 375 1,262 S7 15 25 O Beta alloys 410 1,396 S8 5 10 O Tungsten alloys 300 1,013 S9 25 10 15 O Molybdenum alloys 300 1,013 S10 50 15 25 O H Hardened steel hardened and tempered 50 HRC H1 50 O hardened and tempered 55 HRC H2 25 O hardened and tempered 60 HRC H3 15 O Hardened cast iron hardened and tempered 55 HRC H4 25 Thermoplasts without abrasive fillers O1 65 65 E Thermosetting plastics without abrasive fillers O2 80 35 35 E Plastic, glass-fiber reinforced GFRP O3 50 10 15 E Plastic, carbon-fiber reinforced CFRP O4 50 10 15 E Plastic, aramid fiber reinforced AFRP O5 50 10 15 E Graphite (technical) 80 Shore O6 65 50 50 E 1 The assignment of the machining groups can be found from page H 8 onwards. Depending on application conditions, the optimum cutting data may differ from the table values by up to ± 25 %. Cutting data for wet machining. E Emulsion O Oil vc Cutting speed D 434 Technical information threading