�Step 3 • Select the cutting speed (continued)
Low-Carbon(3% C) and Free-MachiningSteelspeed — m/minStarting Conditions
material
groupgrade135180225275320360410455495m/min
WP15CT395
WP25CT275
P0/P1WP35CT210
WS10PT280
WM35CT280
Medium- and High-Carbon Steels(speed — m/minStarting Conditions
material
groupgrade135180225275320360410455495m/min
WP15CT265
WP25CT195
P2WP35CT150
WS10PT200
WM35CT200
Alloy Steels andTool Steels(�330 HB) (�35HRC)speed — m/minStarting Conditions
material
groupgrade135180225275320360410455495m/min
WP15CT190
WP25CT155
P3WP35CT120
WS10PT155
WM35CT155
Alloy steels andTool Steels(340–450 HB) (36–48 HRC)speed — m/minStarting Conditions
material
groupgrade6090120150180210240270300m/min
WP15CT145
WP25CT105
P4WP35CT95
WS10PT110
WM35CT110
Ferritic, Martens (�330 HB) (�35 H materialitic, and PH Stai B)nless Steelsspeed — m/minStarting Conditions
groupgrade120150180210240270300330360m/min
WP15CT215
P5WP25CT195
WP35CT135
WS10PT200
Ferritic, Martens (340–450 HB) (36itic, and PH Stai –48 HRC)nless Steelsspeed — m/minStarting Conditions
material
groupgrade105135165195225255285315345m/min
WP15CT180
P6WP25CT150
WP35CT105
WS10PT150