A-286 at a glance
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Designation
| Item | Value |
|---|---|
| Designation | A-286 |
| Class | Steel and stainless |
| Type | iron-base superalloy |
Composition
| Item | Limit | Source |
|---|---|---|
| Composition | Iron base, nickel 24–27 %, chromium 13.5–16 %, molybdenum 1.0–1.5 %, titanium 1.9–2.35 %, vanadium 0.1–0.5 % | ATI A286 alloy page, chemical composition (AMS 5525) |
Properties
| Property | Value | Source |
|---|---|---|
| Type | Precipitation-hardening iron-base alloy | MIL-HDBK-5J, par. 6.2.1.0 |
| Temperature | High strength to 1,300 °F; oxidation resistance to 1,500 °F | MIL-HDBK-5J, par. 6.2.1.0 |
| Sheet, strip, plate | AMS 5525, solution treated (1,800 °F) and aged | MIL-HDBK-5J, Table 6.2.1.0(a) |
| Bar, forging, tubing | AMS 5731, 5732, 5734, 5737 | MIL-HDBK-5J, Table 6.2.1.0(a) |
| Compared with stainless | Somewhat harder to hot or cold work than the austenitic stainless steels | MIL-HDBK-5J, par. 6.2.1.0 |
Design allowables — A-286 sheet, strip and plate, solution treated and aged
AMS 5525, thickness over 0.004 in. MIL-HDBK-5J Table 6.2.1.0(b), p. 6-6.
| Property | S basis | Unit |
|---|---|---|
| Ftu, LT | 140 | ksi |
| Fty, LT | 95 | ksi |
| Fcy, LT | 95 | ksi |
| Fsu | 91 | ksi |
| Elongation, LT | 15 | % |
| E | 29.1 | 10³ ksi |
| G | 11.1 | 10³ ksi |
| Density | 0.287 | lb/in³ |
Bars (AMS 5731, 5732, 5734, 5737) have their own columns by diameter in the same table: Ftu 130–140 ksi, Fty 85–95 ksi.
Notes from the guide
- Hot-section material. Specified by the engine or airframe maker.
- Heavier forming loads than stainless.
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Sources
- MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (31 Jan 2003) — par. 6.2.0.2, 6.2.1.0 and Tables 6.2.1.0(a), (b), pp. 6-5 and 6-6. Cancelled; superseded by MMPDS.
- MMPDS (formerly MIL-HDBK-5) — the current home of design allowables. A repair substantiation cites MMPDS or the SRM, not a website.
- ATI, A286 alloy — Chemical composition and AMS 5525.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.