A "cleaner" version of 17-4 — re-melted to eliminate delta ferrite stringers, giving significantly better transverse (across-grain) toughness. Used where 17-4 would be specified but the part sees loading across the forging grain direction. Aerospace structural forgings and helicopter rotor components are the canonical applications.
Vacuum-consumable re-melted or vacuum-induction melted for improved isotropy.
Preferred over 17-4 for airframe forgings per many aerospace OEM specs (e.g., Boeing BMS 7-240).
H900 through H1150 conditions; interchangeable tooling and process.
| Element | Content |
|---|---|
| Iron | Balance |
| Chromium | 14.0–15.5% |
| Nickel | 3.5–5.5% |
| Copper | 2.5–4.5% |
| Niobium + Tantalum | 0.15–0.45% |
| Carbon (max) | 0.07% |
Composition per ASTM A564. Specific mill test reports (MTR) available on request for production orders.
Specify 15-5 PH when part loading runs transverse to forging grain.
Cut in Condition A, age-harden after. See 17-4 PH page for cutting data.
Typically 15–25% more expensive than 17-4 due to re-melt process.
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