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| Grade | Code | EN | Precipitation-Hardening Stainless Steels |
| 13-8PH / 13-8 Mo | X3CrNiMoAl13-8-2 | 1.4534 |
13-8PH is a martensitic precipitation-hardening stainless steel that offers high strength, good fracture toughness and resistance to stress-corrosion cracking. Its mechanical properties can be tailored through solution treatment and ageing, and it is produced to provide the high metallurgical cleanliness and uniformity required for critical components.
| C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | Al % | N % | Fe % |
| ≤ 0.05 | ≤ 0.10 | ≤ 0.10 | ≤ 0.01 | ≤ 0.008 | 12.25–13.25 | 7.50–8.50 | 2.00–2.50 | 0.90–1.35 | ≤ 0.010 | Bal. |
| Product | Rp0.2 [MPa] | Rm [MPa] | Elongation [%] | Hardness [HB] | Density [g/cm³] |
| Bar | 827 | 1,103 | 17 | ≈311* | 7.76 |
* The listed properties are typical production-bar values. For Condition A, AMS 5629 sets a maximum hardness of 363 HB.
| Sector | Products |
| Aerospace | Landing gear components, actuator shafts, structural fasteners |
| Defense Industry | Missile structural parts, high-strength pins, locking hardware |
| Oil, Gas and Petrochemicals | Valve stems, pump shafts, wellhead fasteners |
| Nuclear Energy | Reactor internals, control-rod drive shafts, high-strength reactor fasteners |
| Marine | Propeller shaft nuts, seawater pump parts, corrosion-resistant fasteners |
| Machinery and General Industry | High-performance shafts, pins, lock washers |
| Plastic Injection Moulding | Mould cores, mould cavities, wear-resistant mould components |
| Medical | Surgical tools, dental tools, high-strength medical device parts |
13-8PH is distinguished by deriving its strength not from carbon-based hardening, but from extremely fine nickel-aluminium precipitates formed during ageing within the martensitic matrix. The material can be machined close to its final dimensions in Condition A and then brought to the required mechanical properties through a single-stage, low-temperature ageing treatment. For 13-8PH, selecting a condition within the H950–H1150 range allows the balance among strength, hardness, ductility, fracture toughness and resistance to stress-corrosion cracking to be tailored to the application. The VIM-VAR double-vacuum melting route limits gas, inclusion and segregation levels, helping to provide uniform and reliable transverse mechanical properties, particularly in thick sections. With a suitable heat-treatment condition, it can retain its mechanical properties up to approximately 315–316 °C.
13-8 PH, PH 13-8 Mo, 13-8 Mo, XM-13, UNS S13800, EN/DIN 1.4534, X3CrNiMoAl13-8-2
| Product Form | ASTM | AMS |
| Bar | ASTM A564/A564M – XM-13 | AMS 5629 |
| Plate | ASTM A693/A693M – XM-13 | AMS 5864 |
15-5 PH – Offers similar precipitation hardening, high strength and good fracture toughness.
17-7 PH – Offers high mechanical strength and an age-hardenable structure.
S165M – Offers high strength, good toughness and corrosion resistance.
ATI – ATI 13-8™ / ATI 13-8-MIL™
Note: The information contained in this datasheet is for informational purposes only; no liability is accepted.
