Table 4b. Cutting Speeds and Feeds for Turning Ferrous Cast Metals
Tool Material Coated Carbide
Uncoated Carbide
Ceramic
Uncoated HSS
Hard
Tough
Hard
Tough
Hard
Tough
Cermet
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. Nodular (Ductile) Iron
Material
Speed (fpm)
28 200 28 130
13 325 13 210
28 490 28 355
13 700 13 510
28 435 28 310 28 145
13 665 13 460 13 175
15 970 11 765 10 615
8 1450
15 845
8 1260 6 1640
8 365 8 355 8 120
4 480 4 445 4 145
f s f s f s
(Ferritic): 60-40-18, 65-45-12
140-190 190-225 225-260 240-300 270-330 300-400 100-150 125-175 175-225 225-300 150-200 200-250 250-300 175-225 225-250 250-300 300-350
100
80 65 45 30 15
(Ferritic-Pearlitic): 80-55-06 (Pearlitic-Martensitic): 100-70-03
{
6 995 5 750
11 1260
28 40
13 65
10 500
5 615
(Martensitic): 120-90-02
{
Cast Steels
110 100
17 370
8 490
36 230
17 285
17 665
8 815
28 495
13 675
15 2090
8 3120
7 625
3 790
f s
(Low-carbon): 1010, 1020
(Medium-carbon): 1030, 1040, 1050
{
9070
f s
17 370
8 490
36 150
17 200
17 595
8 815
28 410
13 590
15 1460
8 2170
7 625
3 790
90 80 60 80 70 55 45
(Low-carbon alloy): 1320, 2315, 2320, 4110, 4120, 4320, 8020, 8620
{
f s f s f s
17 310
8 415
36 115 28 70 †
17 150 13 145 13 355
17 555
8 760
15 830
8 1240
(Medium-carbon alloy): 1330, 1340, 2325, 2330, 4125, 4130, 4140, 4330, 4340, 8030, 80B30, 8040, 8430, 8440, 8630, 8640, 9525, 9530, 9535
1544 5
8 665
{
350-400 8 1430 The combined feed/speed data in this table are based on tool grades (identified in Table 16) as shown: uncoated carbides, hard = 17; tough = 19, † = 15; coated car bides, hard = 11; tough = 14; ceramics, hard = 2; tough = 3; cermet = 7. Also, see footnote to Table 4a. 30 28 115 † 28 335 13 345 15 955
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