CUTTING SPEEDS | G-NOTCH
Recommended Starting Speeds v c (ft/min) S125 f n (inch/rev) .003 .006 .010
Brinell Hardness HB
Rockwell Hardness HRC
Tensile Strength MPa
Material Group
ISO
Workpiece Material
Low-Carbon Steels, Long Chipping (C < .25%) Ex. A36, 1008, 1010, 1018, 1108, 1117
PO
<125
<530 525 440 360
Low-Carbon Steels, Short Chipping, Free Machining (C < .25%) Ex. 10L18, 1200 Series, 1213, 12L14
P1
<125
<530 460 410 345
Medium- and High-Carbon Steels (C > .25%) Ex. 1035, 1045, 10L45, 1080, 1137, 1144, 1525, 1572
P2
<220
<25
>530 400 360 300
Alloy Steels and Tool Steels (C > .25%) Ex. P20, 1300, 2000, 3000, 4000, 5000, 8000, SAE A, D, H, O, S, M, T High-Strength Alloy Steels and Tool Steels (C > .25%) Ex. P20, 1300, 2000, 3000, 4000, 5000, 8000, SAE A, D, H, O, S, M, T
P Steel
P3
<330
<35 600-850 345 310 230
P4
340-450 35-48 850-1400 300 250 200
Ferritic, Martensitic and PH Stainless Steels Ex. 13-8 PH, 15-5 PH, 17-4 PH, 400 and 500 Series
P5
<330
<35 600-900 360 330 280
High-Strength Ferritic, Martensitic and PH Stainless Steels Ex. 13-8 PH, 15-5 PH, 17-4 PH, 400 and 500 Series
P6
340-450 35-48 900-1350 280 230 200
Austenitic Stainless Steels Ex. 200 Series, 301, 302, 304, 304L, 309
M1
130-200
<600 460 400 330
M Stainless Steel
High-Strength Austenitic Stainless and Cast Stainless Steels Ex. 310, 316, 316L, 321, 347, 384
M2
150-230 <25 600-800 400 330 280
Duplex Stainless Steels Ex. 323, 329, F55, 2205
M3
135-275 <30 <800 430 350 300
Gray Cast Iron Ex. Class 20, 25, 30, 35, 40, 45, 50, 55, 60, G1800, G3000, G3500, G4000
K1
120-290 <32 125-500 920 720 560
Ductile Cast Irons (Nodular Irons) and Compacted Graphite Irons (CGI) Ex. 60-40-18, 65-45-12, 80-55-06, SAE J434: D4018, D4512, D5506 High-Strength Ductile Irons and Austempered Ductile Irons (ADI) Ex. ASTM A536: 100-70-03, 120-90-02, SAE J434: D7003
K Cast Iron
K2
130-260 <28
<600 690 540 425
K3
180-350 <43
>600 490 360 260
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