Table 2. Cutting Speeds and Feeds for Turning Tool Steels
Tool Material Coated Carbide
Uncoated
Uncoated Carbide
Ceramic
HSS Speed (fpm)
Hard
Tough
Hard
Tough
Hard
Tough
Cermet
Brinell Hardness Number a 150-200 175-225 175-225 200-250 200-250 200-250 225-275 150-200 200-250 325-375 48-50 RC 50-52 RC 52-56 RC 150-200 200-250 150-200
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 Designation
Water hardening: W1, W2, W5 Shock resisting: S1, S2, S5, S6, S7 Cold-work, oil hardening: O1, O2, O6, O7 Cold-work, high carbon, high chromium: D2, D3, D4, D5, D7 Cold-work, air hardening: A2, A3, A8, A9, A10
100 70 70
f s
17 455
8 610
36 210
17 270
17 830
8 1110
28 575
13 805
13 935
7 1310
13 790
7 1110
7 915
3 1150
45 70 55 45 80 65 50 20 10 — 60 50 55 45 75 90 80 65 55
A4, A6
f s
17 445
8 490
36 170
17 235
17 705
8 940
28 515
13 770
13 660
7 925
13 750
7 1210
7 1150
3 1510
A7
f s f s f s f s f s
17 165
8 185
36 55
17 105
17 325
8 350
28 175
13 260
8 660 10 270 13 750 13 790 13 790
4 730 5 500
7 445
3 560
Hot-work, chromium type: H10, H11, H12, H13, H14, H19
17 55 † 36 170 36 210 36 210
8 90
7 385‡
3 645 7 925
Hot-work, tungsten type: H21, H22, H23, H24, H25, H26 Hot-work, molybdenum type: H41, H42, H43
17 445 17 445 17 445
8 490 8 610 8 610
17 235 17 270 17 270
17 705 17 830 17 830
8 940
28 515 28 575 28 575
13 770 13 805 13 805
13 660 13 935 13 935
7 1210 7 1110 7 1110
7 1150
3 1510 3 1150 3 1150
200-250 150-200 100-150 150-200 200-250 225-275 225-275
8 1110 8 1110
7 1310 7 1310
7 915 7 915
Special purpose, low alloy: L2, L3, L6
Mold: P2, P3, P4, P5, P6, P26, P21 High-speed steel: M1, M2, M6, M10, T1, T2,T6 M3-1, M4 M7, M30, M33, M34, M36, M41, M42, M43, M44, M46, M47, T5, T8
f s
17 445
8 490
36 170
17 235
17 705
8 940
28 515
13 770
13 660
7 925
13 750
7 1210
7 1150
3 1510
T15, M3-2 45 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.
Made with FlippingBook - Share PDF online