15-5PH
Data verified15-5PH is a refinement of 17-4PH with tighter control of delta ferrite, giving better transverse toughness and ductility, especially in vacuum-melted quality. It is specified for aerospace and nuclear parts in heavier sections.
Chemical composition
| Element | Content (%) |
|---|---|
| C | ≤0.07 |
| Si | ≤1.00 |
| Mn | ≤1.00 |
| P | ≤0.030 |
| S | ≤0.015 |
| Cr | 14.00–15.50 |
| Ni | 3.50–5.50 |
| Cu | 2.50–4.50 |
| Nb | 0.15–0.45 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Solution treated (Condition A) or aged |
| Hardness (H900 aged) | ~40 HRC |
| Tensile strength (H900) | ~1310 MPa |
| Density | 7.80 g/cm³ |
| Magnetic | Yes |
Heat treatment
Solution treat 1025–1055 °C; age as 17-4PH (H900 482 °C/1 h; H1150 621 °C/4 h). Vacuum-melted (ESR/VAR) versions give improved transverse toughness.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.4545 (close) |
| aisi | XM-12 (15-5PH) |
| gb | 05Cr15Ni5Cu4Nb |
Compare side by side: 15-5PH vs 17-4PH
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Aircraft structural parts, engine components, landing-gear hardware, nuclear reactor parts, high-strength fasteners.
Processing: Machines like 17-4PH; forging response is better than 17-4PH; properties are more uniform through thick sections.
FAQ
- 15-5PH or 17-4PH?
- Strength and corrosion performance are nearly identical; choose 15-5PH when transverse toughness in thick or forged sections matters, 17-4PH for general availability and price.
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Ask for a quotationVisit NasteelSource: ASTM A564 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.