15-5PH at a glance
Where to buy
Designation
| Item | Value |
|---|---|
| Designation | 15-5PH |
| Class | Steel and stainless |
| Type | precipitation-hardening stainless steel |
Composition
| Item | Limit | Source |
|---|---|---|
| Composition | Chromium 14.0–15.5 %, nickel 3.5–5.5 %, copper 2.5–4.5 %, niobium plus tantalum 0.15–0.45 %, carbon 0.07 % max | Metal supplier's 15-5 PH datasheet, chemical composition (AMS 5659 / AMS 5862) |
Properties
| Property | Value | Source |
|---|---|---|
| Use | Parts needing corrosion resistance and high strength to 600 °F; good transverse ductility and strength in large sections | MIL-HDBK-5J, par. 2.6.7.0 |
| Bar | AMS 5659 | MIL-HDBK-5J, Table 2.6.7.0(b) |
| Plate | AMS 5862, H1025 | MIL-HDBK-5J, Table 2.6.7.0(c) |
| Never | Use in Condition A; use H900 or H925 where good fracture toughness or impact is required | MIL-HDBK-5J, par. 2.6.7.0 |
| Best notch toughness | H1150M, recommended for cryogenic use | MIL-HDBK-5J, par. 2.6.7.0 |
Design allowables — 15-5PH bar (AMS 5659) by condition, S basis
Bar up to 12 in. Strength in ksi. MIL-HDBK-5J Table 2.6.7.0(b), p. 2-169.
| Condition | Ftu | Fty | Elongation L, % | Elongation T, % |
|---|---|---|---|---|
| H900 | 190 | 170 | 10 | 6 |
| H925 | 170 | 155 | 10 | 7 |
| H1025 | 155 | 145 | 12 | 8 |
| H1075 | 145 | 125 | 13 | 9 |
| H1100 | 140 | 115 | 14 | 10 |
| H1150 | 135 | 105 | 16 | 11 |
Plate (AMS 5862), H1025, 0.187–0.625 in: Ftu 155 (LT), Fty 145, Fcy 150–152, Fsu 97, elongation 8 percent (Table 2.6.7.0(c), p. 2-170). E = 28.5 × 10³ ksi, G = 11.2 × 10³ ksi, density 0.283 lb/in³.
Notes from the guide
- Never Condition A in service.
- H900/H925 and toughness don't mix.
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Sources
- MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (31 Jan 2003) — par. 2.6.7.0 and Tables 2.6.7.0(b) and (c), pp. 2-169, 2-170. Cancelled; superseded by MMPDS.
- FAA AC 43.13-1B CHG 1 — Table 4-3 (17-4PH, for comparison).
- MMPDS (formerly MIL-HDBK-5) — the current home of design allowables. A repair substantiation cites MMPDS or the SRM, not a website.
- Metal supplier's 15-5 PH datasheet — Chemical composition table.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.