Relative Machinability
The following table compares the machinability of various steel specifications to the machinability of 230M07 (EN1A Freecutting), which is taken as being 100
| BS 970 1991/1983 | En/AISI No. | Index |
|---|---|---|
| 230M07 | En1A | 100 |
| 230M07Pb | En1A Pb | 130 |
| 080A15/070M20 | En3B | 55 |
| 080A15/070M20 Pb | En3B Pb | 70 |
| 210M15 | En32M | 70 |
| 210M15 Pb | En32M Pb | 95 |
| 214M15 | En202 | 80 |
| 080M40 | En8 | 44 |
| 080M40 Pb | En8 Pb | 58 |
| 212A42 | En8DM | 58 |
| 212A42 Pb | En8DM Pb | 70 |
| 226M44 | Usacut 45 | 65 |
| 150M19 | En14A | 54 |
| 070M55 | En9 | 33 |
| 606M36T | En16MT | 38 |
| * | Usacut 55T | 44 |
| 605M36T | En16T | 30 |
| 605M36T Pb | En16T Pb | 38 |
| 708M40T | En19T | 25 |
| 817M40T | En24T | 25 |
| 817M40 Annealed | En24 Annealed | 30 |
| 665M17 | En34 | 42 |
| 655M13 | En36 | 36 |
| 635M15 | En351 | 44 |
| 805M20 | AISI SAE8620 | 44 |
| 805M20 Pb | AISI SAE8620 Pb | 54 |
| 722M24T | En40BT | 22 |
| 303S31 | En58AM | 45 |
| 416S21 | EN56AM | 68 |
| 316S11 | En58J | 33 |
| 431S29 | En57 | 30 |
This table should be used as a guide only. Machinability may vary with machine type and operating conditions.
