Machinability Ratings

Grade
302
302/304 “B”
303
303 High Tensile
304
304 L
309
310
316
316 “B”
316 L
317-317 L
321
330
347
403
410
416 Ann
416 H.T.
418 (Greek Ascoloy)

Approximate Surf. Ft. Per Min.
70
55
150
80
70
70
60
60
60
50
60
60
60
45
60
95
95
150
85
96

% Relative Speed Based on B-1112 as 100%
40
28
75
43
40
40
36
36
22
36
36
36
20
36
54
54
75
50
50
50

Grade
420
420 F
430
430 F
431
440 A
440 C
440 F Se
446
Custom 455
PH-13-8 MO
15-5 PH
17-4 PH
17-4 PH “H1150”
17-7 PH
AM 355
Nitronic 40
Nitronic 50
Nitronic 60
Carp. 20

Approximate Surf. Ft. Per Min.
85
125
110
150
80
65
65
80
60
55
60
75
75
85
75
72
50
50
50
70

% Relative Speed Based on B-1112 as 100% (165 SFM)
50
68
66
75
48
40
40
48
36
28
36
45
45
50
45
42
22
22
22
40

Grade
Maraging “300”
A-286
4750
L-605
Nickel “200”
Nickel “400”
Nickel “405”
Nickel “K-500”
Nickel “600”

Approximate Surf. Ft. Per Min.
60
54
60
15
110
80
80
60
50

% Relative Speed Based on B-1112 as 100%
36
28
36
9
66
48
48
36
22

Grade
Nickel “625”
718
X-750
INVAR 36 “FM”
Waspaloy
Alloy C (C-276)
Alloy X
Kovar
Alloy R41

Approximate Surf. Ft. Per Min.
20
20
20
92
45
40
45
60
15

% Relative Speed Based on B-1112 as 100% (165 SFM)
12
12
12
55
20
18
20
22
9