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| Grade | Code | EN | Precipitation-Hardening Stainless Steels |
| 15-5PH | X5CrNiCu15-5 | 1.4545 |
15-5PH is a high-strength martensitic stainless steel that can be precipitation hardened. Developed as an advanced derivative of 17-4PH, its more homogeneous microstructure provides improved transverse toughness, ductility and forgeability. The material is generally supplied in the solution-treated condition, and the required balance of strength and toughness is obtained through a single-stage, low-temperature ageing treatment. By combining high mechanical strength with good corrosion resistance, dimensional stability and machinability, it is a preferred PH stainless steel for precision components exposed to high loads.
| C % | Mn % | Si % | P % | S % | Cr % | Ni % | Cu % | Nb + Ta % |
| ≤ 0.07 | ≤ 1.00 | ≤ 1.00 | ≤ 0.040 | ≤ 0.030 | 14.00 – 15.50 | 3.50 – 5.50 | 2.50 – 4.50 | 0.15 – 0.45 |
| Product form | Rp0.2 [MPa] | Rm [MPa] | Elongation [%] | Hardness [HB] | Density [g/cm³] |
| Bar | 827–903 | 931–1,007 | 14–17 | ≈286 | 7.75 |
| Plate | ≈963 | ≈1,110 | ≈8 | ≈327 | 7.78 |
| Sector | Products |
| Aerospace | Aircraft structural fittings, engine components, flap tracks |
| Defence industry | Missile-system components, firearm mechanism components, high-strength fasteners |
| Oil and gas | Wellhead components, high-pressure valve bodies, pump shafts |
| Chemical and petrochemical | Process valves, pump components, high-pressure fittings |
| Energy and nuclear | Nuclear reactor components, turbine shafts, compressor components |
| Food processing | Mixer shafts, pump shafts, valve components |
| Pulp and paper | Roll shafts, pump shafts, valve components |
| General engineering | Gears, drive shafts, high-strength bolts |
15-5PH offers consistent mechanical properties, particularly in thick sections and parts loaded from different directions, due to the homogeneous microstructure and low delta-ferrite content achieved through controlled melting practices. In Condition A, the material can be machined and welded; subsequent single-stage ageing at low temperature forms copper-rich precipitates, producing high strength and hardness. This treatment allows the part to be machined close to its final dimensions while limiting the risk of distortion. 15-5PH may undergo approximately 0.04–0.10% dimensional contraction during ageing, so close tolerances should be planned accordingly. The final heat-treatment condition should be selected by considering strength, toughness, fatigue performance and stress-corrosion requirements together.
15-5PH, 15Cr-5Ni, PH15-5, SAE 15-5, EN/DIN 1.4545, X5CrNiCu15-5, UNS S15500, ASTM XM-12
| Product form | ASTM | AMS |
| Bar | ASTM A564/A564M – Grade XM-12 | AMS 5659 |
| Plate | ASTM A693/A693M – Grade XM-12 | AMS 5862 |
13-8PH – The closest alternative for components requiring high strength, toughness and resistance to stress-corrosion cracking.
17-7PH – May be considered particularly for sheet and thin-plate applications requiring high strength and fatigue resistance.
1.4418 – Suitable for bars, shafts and thick-section components where high strength must be combined with impact toughness.
Carpenter Technology – 15Cr-5Ni / UNS S15500
BÖHLER Edelstahl – N701 AMS / 15-5PH / UNS S15500
Note: The information contained in this datasheet is for informational purposes only; no liability is accepted.
