Steels with Chromium content between 10–18%, Carbon up to 2% and with the addition of other elements.
In order to improve both mechanical properties and corrosion resistance, they are heated to an appropriate temperature, 950°-1050°C, followed by suitable quenching and tempering.
Martensitic steels are ferromagnetic.
| W.N. | AISI | UNS | EN | BS |
|---|---|---|---|---|
| 1.6546 | – | – | 40NiCrMo2 | – |
| 1.4731 | – | – | X40CrSiMo10-2 | – |
| – | 440A | S44002 | – | – |
| – | 440B | S44003 | – | – |
| 1.4112 | – | – | X90CrMoV18 | – |
| 1.4125 | 440C | S44004 | X105CrMo17 | – |
| – | 440C | S44004 | – | – |
| 1.4037 | – | – | X65Cr13 | – |
| – | 8640 MOD. | – | – | – |
| 1.4006 / 1.4011 | 403 / 410 | S40300 / S41000 | X12Cr13 / X12Cr12 | 410S21 |
| 1.4002 | 405 | S40500 | X6CrAl13 | – |
| 1.4006 / 1.4011 | 403 / 410 | S40300 / S41000 / S41001 | X12Cr13 / X12Cr12 | – |
| 1.4024 | – | – | X15Cr13 | – |
| – | 410CB | S41040 | – | – |
| – | 403Cb / XM-30 | S41040 | – | – |
| 1.4005 | 416 | S41600 | X12CrS13 | 416S21 |
| – | – | S41025 | X13CrMo12 | – |
| – | – | S41025 | X13CrMo12 | – |
| – | 416R | – | – | – |
| 1.4005 | 416 | S41600 | X12CrS13 | 416S21 |
| 1.4034 | – | – | X46Cr13 | – |
| 1.4036 | – | – | X46Cr13 | – |
| 1.4021 | 420 | S42000 | X20Cr13 | – |
| 1.4021 | 420 | S42000 | X20Cr13 / X20Cr14 | – |
| – | – | – | – | 420S29 |
| – | – | – | – | 420S37 |
| – | 420 MOD | S42000 | – | – |
| 1.4120 | – | – | X20CrMo13 | – |
| 1.4028 | 420 | S42000 | X30Cr13 | 420S45 |
| 1.4029 | 420F | S42020 | X29CrS13 | – |
| 1.4031 | 420 | S42000 | X39Cr13 | – |
| 1.4035 | – | – | X46CrS13 | – |
| 1.4116 | – | – | X50CrMoV15 | – |
| 1.4913 | – | – | X19CrMoNbVN11-1 | – |
| 1.4913 | – | – | X19CrMoNbVN11-1 | – |
| 1.4923 / 1.4922 | – | – | X22CrMoV12-1 / X21CrMoNiV12-1 | – |
| – | 616 / 422 / B4B | S42200 | – | – |
| 1.4122 | – | – | X39CrMo17-1 | – |
| 1.4122 | – | – | X35CrMo17 | – |
| 1.4057 | 431 | S43100 | X17CrNi16-2 | – |
| – | – | – | – | 431S29 |
| 1.4939 | XM-32 | S64152 | X12CrNiMoN12 | – |
| 1.4313 | – | S41500 | X3CrNiMo13-4 | – |
| 1.4313 / 1.4413 | – | S41500 | X3CrMo13-4 / X3CrNiMo134 / X4CrNiMo13-4 | – |
| – | – | S41500 | – | – |
| – | – | S41426 | – | – |
| 1.4418 | – | – | X4CrNiMo16-5-1 | – |