Steels with a chromium content of more than 10,5% and less than 0,15% carbon. Unlike martensitic steels, these grades cannot be stiffened by quench hardening but only through cold working (e.g. Cold drawing). Ferritic steels are ferromagnetic.
| W.N. | AISI | UNS | EN | BS |
|---|---|---|---|---|
| – | – | S40940 | – | – |
| – | – | S40976 | – | – |
| – | 414 | S41400 | – | – |
| 1.4512 | 409 | S40900 | X2CrTi12 | – |
| 1.4003 | – | S41003 | X2CrNi12 / X2Cr11 | – |
| 1.4742 | – | – | X10CrAlSi18 / X10CrAl18 | – |
| 1.4016 | 430 | S43000 | – | 430S11 / 430S18 |
| 1.4113 | 434 | S43400 | X6CrMo17-1 | 434S20 |
| 1.4105 | 430F | S43020 | X6CrMoS17 | – |
| 1.4511 | – | – | X3CrNb17 | – |
| 1.4510 | 430Ti | S43036 | X3CrTi17 | – |
| – | 430F | S43020 | – | – |
| 1.4104 | – | – | X14CrMoS17 | – |
| 1.4521 | 444 | S44400 | X2CrMoTi18-2 | – |
| – | XM-34 | S18200 | – | – |
| 1.4762 | – | – | X10CrAlSi25 / X10CrAl24 | – |
| – | 446 | S44600 | – | – |
| 1.4713 | – | – | X10CrAlSi7 | – |