15-5PH / X5CrNiCuNb15-5
1.4545Martensitic precipitation-hardening stainless steel. Similar to 17-4PH but with better transverse ductility and toughness due to lower delta ferrite. Used for aerospace structural components, nuclear reactor parts, food processing equipment, and high-performance fasteners.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AMS | USA | UNS S15500 | S15500 | REF |
| 🇪🇺 | EN | Europe | X5CrNiCuNb15-5 | 1.4545 | 95% |
Sources: AMS 5659, EN 10088-3
Chemical composition comparison (wt%)
Side-by-side: 15-5PH / X5CrNiCuNb15-5 (ASTM) (AMS 5659) vs X5CrNiCuNb15-5 (EN)
| Element | 15-5PH / X5CrNiCuNb15-5 (ASTM) | X5CrNiCuNb15-5 (EN) | Overlap |
|---|---|---|---|
| C | 0–0.07% | — | — |
| Si | 0–1% | — | — |
| Mn | 0–1% | — | — |
| P | 0–0.03% | — | — |
| S | 0–0.01% | — | — |
| Cr | 14–15.5% | — | — |
| Ni | 3.5–5.5% | — | — |
| Cu | 2.5–4.5% | — | — |
| Nb | 0.15–0.45% | — | — |
Mechanical properties
H900
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 1310 | MPa |
| Yield Strength | ≥ 1170 | MPa |
| Elongation | ≥ 10 | % |
| Hardness HRC | 40–47 | HRC |
| Elastic Modulus | ≥ 196 | GPa |
| Density | ≥ 7.78 | g/cm3 |
H1025
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 1070 | MPa |
| Yield Strength | ≥ 1000 | MPa |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| solution_treating | 1020–1050 °C | air | 30-60 min | Cool to room temperature before aging |
| aging_H900 | 480–480 °C | air | 1 hour min | H900: Max strength (1310 MPa UTS) |
| aging_H1025 | 552–552 °C | air | 4 hours min | H1025: Better toughness, moderate strength |
Compatibility verdict
15-5PH / X5CrNiCuNb15-5 and X5CrNiCuNb15-5: 95% composition match
Close equivalents but NOT identical.
Related materials
304 Stainless Steel
1.4301The most widely used austenitic stainless steel. Excellent corrosion resistance, good formability and weldability. Standard choice for food processing, chemical, and architectural applications.
316L
1.4404Low-carbon austenitic stainless steel with molybdenum addition. Superior corrosion resistance to 304, especially against chlorides and pitting. Standard choice for chemical processing, marine, medical implants, and pharmaceutical equipment.
430 Stainless Steel
1.4016Ferritic chromium stainless steel with good corrosion resistance and formability. Lower cost than austenitic grades. Used for automotive trim, kitchen sinks, architectural panels, and appliance components.
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