Table 4a. Cutting Speeds and Feeds for Turning Ferrous Cast Metals
Tool Material
Uncoated Carbide
Coated Carbide
Ceramic
HSS
Tough
Hard
Tough
Hard
Tough
Cermet
CBN
Brinell Hardness Number
f = feed (0.001 in/rev), 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. Gray Cast Iron
Speed (fpm)
Material
ASTM Class 20 ASTM Class 25
120-150 120
f s f s f s f s f s
28 240 28 160 28 110 28 180 28 125
13 365 13 245 13 175
28 665 28 400
13 1040
28 585 28 360 28 410 28 660 28 340
13 945 13 580 13 575 13 885 13 510
15 1490 11 1440 15 1060 15 1640 13 1640
8 2220 6 1880 8 1590 8 2450 7 2310
15 1180 11 1200
8 1880 6 1570 8 1320 8 2110 7 1970
8 395 8 335 8 260
4 510 4 420 4 325
24 8490 24 1590
11 36380
160-200 190-220 220-260 250-320 100-215 120-175 150-250
90 80 60 35 70 65 50
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)
13 630
11 2200
15 885
Malleable Iron
13 280 13 200
28 730 28 335
13 940 13 505
15 1410 13 1400
(Ferritic): 32510, 35018
110-160 130
160-200 200-240 200-255 220-260 240-280 250-320
95 75 70 60 50
(Pearlitic): 40010, 43010, 45006, 45008, 48005, 50005 (Martensitic): 53004, 60003, 60004
(Martensitic): 70002, 70003
f s
28 100
13 120
28 205
13 250
11 1720
6 2240
11 1460
6 1910
(Martensitic): 80002 (Martensitic): 90001
30 Speeds for HSS (high-speed steel) tools are based on a feed of 0.012 inch/rev and a depth of cut of 0.125 inch; use Table 5c to adjust the given speeds for other feeds and depths of cut. The combined feed/speed data in the remaining columns are based on a depth of cut of 0.1 inch, lead angle of 15 degrees, and nose radius of 3 ∕ 64 inch. Use Table 5a to adjust the given speeds for other feeds, depths of cut, and lead angles; use Table 5b to adjust given speeds for increased tool life up to 180 minutes. Examples are given in the text. The combined feed/speed data in this table are based on tool grades (identified in Table 16) as follows: uncoated carbides, tough = 15; Coated carbides, hard = 11, tough = 14; ceramics, hard = 2, tough = 3; cermet = 7; CBN = 1.
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