Table 14. Cutting Speeds and Feeds for Milling Ferrous Cast Metals
End Milling
Face Milling
Slit Milling
Uncoated Carbide
Coated Carbide
Uncoated Carbide
Coated Carbide
Uncoated Carbide
Coated Carbide
HSS
HSS
Ceramic
CBN
Brinell Hardness Number
f = feed (0.001 in/tooth), s = speed (ft/min) Metric Units: f 3 25.4 = mm/rev, s 3 0.3048 = m/min Opt. Avg. Opt. Avg. Opt. Avg. Opt. Avg. Opt. Avg. Opt. Avg. Opt. Avg. Opt. Avg. Opt. Avg. Gray Cast Iron
Speed (fpm)
Material
ASTM Class 20 ASTM Class 25
120-150 100 160-200 80 190-220 70
f s
5 35 5 30
3 90
5 520 5 515
3 855
39 140
20 225
39 285 39 185
20 535
39 1130
20 1630 20 1220
39 200 39 150
20 530 20 400
39 205 39 145
20 420
ASTM Class 30, 35, and 40 ASTM Class 45 and 50 ASTM Class 55 and 60 ASTM Type 1, 1b, 5 (Ni resist) ASTM Type 2, 3, 6 (Ni resist) ASTM Type 2b, 4 (Ni resist)
220-260 50 f s 250-320 30 100-215 50 120-175 40 150-250 30 110-160 110 f s 160-200 80 f s 200-240 65 200-255 55
3 70
3 1100
39 95
20 160
20 395
39 845
20 380
Malleable Iron
5 30 5 25
3 70 3 65
5 180 5 150
3 250 3 215
39 120
20 195 20 150
39 225 39 210
20 520 20 400
39 490 39 295
20 925 20 645
39 85 39 70
20 150 20 125
(Ferritic): 32510, 35018
(Pearlitic): 40010, 43010, 45006, 45008, 48005, 50005 (Martensitic): 53004, 60003, 60004
39 90
(Martensitic): 70002, 70003
220-260 50 240-280 45 250-320 25
(Martensitic): 80002 (Martensitic): 90001
Nodular (Ductile) Iron
140-190 75 f s
7 15 7 10
4 35 4 30
7 125
4 240 4 210
39 100
20 155 20 145
39 120 39 150
20 255 20 275
39 580 39 170
20 920 20 415
39 60 39 40
20 135 20 100
(Ferritic): 60-40-18, 65-45-12
190-225 60 225-260 50 240-300 40 270-330 25
(Ferritic-Pearlitic): 80-55-06 (Pearlitic-Martensitic): 100-70-03
{
f s
7 90
39 95
(Martensitic): 120-90-02
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