Table 1. Cutting Speeds and Feeds for Turning Plain Carbon and Alloy Steels Table 1. (Continued) Cutting Speeds and Feeds for Turning Plain Carbon and Alloy Steels
Tool Material Coated Carbide
Uncoated Carbide
Ceramic
HSS
Hard
Tough
Hard
Tough
Hard
Tough
Cermet
Brinell Hardness Number a 220-300
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.
Material AISI/SAE Designation
Speed (fpm)
65
f s
17 220
8 295
36 100
17 150
20 355
10 525
28 600
13 865
10 660
5 810
7 570
3 740
300-350
50
Ultra-high-strength steels (not ASI): AMS alloys 6421 (98B37 Mod.), 6422 (98BV40), 6424, 6427, 6428, 6430, 6432, 6433, 6434, 6436, and 6442; 300M and D6ac
17 105
17 325
8 350
28 175
13 260
8 660
4 730
7 445
3 560
17 165
8 185
36 55 †
f s
350-400
35
43-48 RC 25
f s
17 55 †
8 90
7 385
3 645
10 270
5 500
48-52 RC 10
f s f s f s f s
17 220
8 295
36 100
17 150
20 355
10 525
28 600
13 865 660 810
10 570 10 270
5 740 7
250-325
60
3
Maraging steels (not AISI): 18% Ni, Grades 200, 250, 300, and 350
17 55
8 90
7 385‡ 15 1490 8 1200
3 645
5 500
50-52 RC 10
17 525 17 330
8 705 8 440
36 235 36 125
17 320 17 175
17 505 17 585
8 525 8 790
28 685 28 125
13 960 13 220
8 2220 4 1320
15 1190
8 1780 4 1060
7 1040
3 1310
200-250
70
Nitriding steels (not AISI): Nitralloy 125, 135, 135 Mod., 225, and 230, Nitralloy N, Nitralloy EZ, Nitrex 1
8 960
7 575
3 740
300-350
30
a Brinell Hardness Number given unless otherwise indicated by RC for hardness on the Rockwell C scale. 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 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, hard = 17, tough = 19, † = 15; coated carbides, hard = 11, tough = 14; ceramics, hard = 2, tough = 3, ‡ = 4; cermet = 7 .
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