Machinability Ratings

GRADE	APPROXIMATE SURFACE FEET PER MINUTE	RELATIVE SPEED BASED ON C-1212
A-286	54	28
L-605	15	9
Nickel 200	110	66
Monel 400	80	48
Monel R405	80	48
Monel K500	60	36
K500 Aged	40	25
600	50	22
625	20	12
718	20	12
X-750	20	12
Waspaloy	45	20
MP 35N	45	20
MP 159	45	20
C-276	40	18
Hast X	45	20
These machinability ratios must be recognized as approximate values. They are a reasonable guide to relative tool life and lower required for cutting. It is obvious, however, that variables of speed, cutting oil, feed and depth of cut will significantly affect these ratios.