Machinability Ratings

Grade Approx.
Surf. Ft.
per min.
% Relative Speed
Based on B-1112
as 100%
Grade Approx.
Surf. Ft.
per min.
% Relative Speed
Based on B-1112
as 100%(165 SFM)
302
302/304 "B"
303
303 H.T.
304
304L
309
310
316
316 "B"
316L
317-317L
321
330
347
410
416 Ann
416 H.T.
418*
70
55
150
80
70
70
60
60
60
50
60
60
60
45
60
95
150
85
96
40
28
75
43
40
40
36
36
36
22
36
36
36
20
36
54
75
50
50
420
420F
430
430F
431
440A
440C
440F Se
446
Ph-13-8 MO
15-5 PH
17-4 PH
17-4 PH "H1150"
Fer. 255/2205
AM 355
Nitronic 40
Nitronic 50
Nitronic 60
Carp. 20
85
125
110
150
80
65
65
80
60
60
75
75
85
60
72
50
50
50
70
50
68
66
75
48
40
40
48
36
36
45
45
50
36
42
22
22
22
40
Super Alloys - Titanium - Electrical Steels
6AL-4V
Maraging "300"
A-286
4750
L-605
Nickel 400
Nickel 600
Nickel 625
90
60
54
60
15
50
50
50
54
36
28
36
9
22
22
22


Waspaloy
Hastelloy C (C-276)
Hastelloy X
Kovar
Haynes Alloy 41
(Rene 41)


45
40
45
60
15


20
18
20
36
9
Alloy
E-4130 Annealed
E-4130 H.T.
E-4140 Annealed
E-4140 H.T.
E-4340 Annealed
E-4340 H.T.
Mod "300M".
E-8620
E-52100
E-6150
120
65
110
60
95
55
95
110
65
100
72
40
66
35
57
35
57
66
40
60
E-8740
E-9310
EN30B Annealed
EN30B H.T.
H-11
Hy-Tuf
D6AC
9-4-30
M-50
110
80
55
40
75
75
80
75
70
66
49
35
25
45
45
49
45
40
Carbon
C-1018
C-1045
C-1117
C-1137
130
95
150
150
78
57
91
72
C-1144
C-12L14
C-1215
Stressproof
125
325
225
125
76
198
136
76

*Greek Ascoloy