
| �Step 3 • S | elect the c | utting s | peed ( | continued) | |||||||
| Low-Carbon( | 3% C) and Free- | Machining | Steel | spe | ed — m/ | min | Starting Conditions | ||||
| material | |||||||||||
| group | grade | 135 | 180 | 225 | 275 | 320 | 360 | 410 | 455 | 495 | m/min |
| WP15CT | 395 | ||||||||||
| WP25CT | 275 | ||||||||||
| P0/P1 | WP35CT | 210 | |||||||||
| WS10PT | 280 | ||||||||||
| WM35CT | 280 | ||||||||||
| Medium- and Hig | h-Carbon Steels | ( | spe | ed — m/ | min | Starting Conditions | |||||
| material | |||||||||||
| group | grade | 135 | 180 | 225 | 275 | 320 | 360 | 410 | 455 | 495 | m/min |
| WP15CT | 265 | ||||||||||
| WP25CT | 195 | ||||||||||
| P2 | WP35CT | 150 | |||||||||
| WS10PT | 200 | ||||||||||
| WM35CT | 200 | ||||||||||
| Alloy Steels and | Tool Steels(�33 | 0 HB) (�35 | HRC) | spe | ed — m/ | min | Starting Conditions | ||||
| material | |||||||||||
| group | grade | 135 | 180 | 225 | 275 | 320 | 360 | 410 | 455 | 495 | m/min |
| WP15CT | 190 | ||||||||||
| WP25CT | 155 | ||||||||||
| P3 | WP35CT | 120 | |||||||||
| WS10PT | 155 | ||||||||||
| WM35CT | 155 | ||||||||||
| Alloy steels and | Tool Steels(340– | 450 HB) (3 | 6–48 HRC | ) | spe | ed — m/ | min | Starting Conditions | |||
| material | |||||||||||
| group | grade | 60 | 90 | 120 | 150 | 180 | 210 | 240 | 270 | 300 | m/min |
| WP15CT | 145 | ||||||||||
| WP25CT | 105 | ||||||||||
| P4 | WP35CT | 95 | |||||||||
| WS10PT | 110 | ||||||||||
| WM35CT | 110 | ||||||||||
| Ferritic, Martens (�330 HB) (�35 H material | itic, and PH Stai B) | nless Steel | s | spe | ed — m/ | min | Starting Conditions | ||||
| group | grade | 120 | 150 | 180 | 210 | 240 | 270 | 300 | 330 | 360 | m/min |
| WP15CT | 215 | ||||||||||
| P5 | WP25CT | 195 | |||||||||
| WP35CT | 135 | ||||||||||
| WS10PT | 200 | ||||||||||
| Ferritic, Martens (340–450 HB) (36 | itic, and PH Stai –48 HRC) | nless Steel | s | spe | ed — m/ | min | Starting Conditions | ||||
| material | |||||||||||
| group | grade | 105 | 135 | 165 | 195 | 225 | 255 | 285 | 315 | 345 | m/min |
| WP15CT | 180 | ||||||||||
| P6 | WP25CT | 150 | |||||||||
| WP35CT | 105 | ||||||||||
| WS10PT | 150 |