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Precipitation hardening alloys of the 17-4 PH and 15-5 PH types achieve their strength by dissolving precipitates by solution annealing. An aging cycle then creates precipitates that strengthen the steel. They are usually characterized by extremely good corrosion resistance.
| Industry standard | Our brands | DIN | UNS | EN | AMS | ASTM | Others |
| 17-4 PH | N700, V630, V631 | 1.4542, 1.4548 | S17400 | X5CrNiCuNb16-4 | 5622, 5643 | – | AISI: 630 |
| 15-5 PH | N701 | 1.4545 | S15500 | X5CrNiCu15-5 | 5659 | – | AISI: XM 12 |
| 13-8 Mo | N4534, N709 | 1.4534 | – | – | 5629 | A564 | – |