17-7PH at a glance
Where to buy
Designation
| Item | Value |
|---|---|
| Designation | 17-7PH |
| Class | Steel and stainless |
| Type | precipitation-hardening stainless steel |
Composition
| Item | Limit | Source |
|---|---|---|
| Composition | Chromium 16–18 %, nickel 6.5–7.75 %, aluminum 0.75–1.5 %, carbon up to 0.09 % | Metal supplier's 17-7 PH datasheet, chemical composition (AMS 5528) |
Properties
| Property | Value | Source |
|---|---|---|
| Related grade in the AC table | PH15-7Mo: carbon 0.09, chromium 15, nickel 7, molybdenum and aluminum | AC 43.13-1B CHG 1, Table 4-3 |
| Sheet, plate | AMS 5528, TH1050 | MIL-HDBK-5J, Table 2.6.10.0(b) |
| Service limit | High strength and good corrosion and oxidation resistance up to 600 °F | MIL-HDBK-5J, par. 2.6.10.0 |
| Forming | Supplied in Condition A for ease of forming; readily cold formed | MIL-HDBK-5J, par. 2.6.10.0 |
| Growth in hardening | Net growth 0.0045 in/in from Condition A to TH1050 | MIL-HDBK-5J, par. 2.6.10.0 |
Design allowables — 17-7PH sheet and plate, TH1050 (AMS 5528)
TH1050 only. MIL-HDBK-5J Table 2.6.10.0(b), p. 2-214.
| Property | Sheet 0.015–0.187, A basis | Sheet 0.015–0.187, B basis | Plate 0.188–0.500 and 0.501–1.000, S | Unit |
|---|---|---|---|---|
| Ftu, LT | 177 | 184 | 180 | ksi |
| Fty, LT | 150 | 167 | 150 | ksi |
| Fcy, LT | 166 | 185 | 166 (to 0.500) | ksi |
| Fsu | 112 | 117 | 114 (to 0.500) | ksi |
| Elongation LT (S basis) | — | — | 6 | % |
| E | 29.0 | 29.0 | 29.0 | 10³ ksi |
| Density | 0.276 | 0.276 | 0.276 | lb/in³ |
Design values come from material austenite conditioned and aged by suppliers; properties of material that has been formed or cold worked may be different. G = 11.5 × 10³ ksi. MIL-HDBK-5J (2003) is superseded by MMPDS.
Notes from the guide
- Hardening growth 0.0045 in/in must be planned for.
- No A-to-service shortcut.
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Sources
- MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (31 Jan 2003) — par. 2.6.10.0 and Table 2.6.10.0(b), p. 2-214. Cancelled; superseded by MMPDS.
- FAA AC 43.13-1B CHG 1 — Table 4-3.
- 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 17-7 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.