Inconel 625 at a glance
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Designation
| Item | Value |
|---|---|
| Designation | Inconel 625 |
| Class | Nickel alloys |
| Type | nickel-base alloy |
Composition
| Item | Limit | Source |
|---|---|---|
| Composition | Nickel 58 % min, chromium 20–23 %, molybdenum 8–10 %, niobium plus tantalum 3.15–4.15 %, iron 5 % max | Special Metals, Inconel alloy 625 bulletin, limiting chemical composition |
Properties
| Property | Value | Source |
|---|---|---|
| Type | Solid-solution, matrix-strengthened nickel-base alloy; no precipitation hardening needed | MIL-HDBK-5J, par. 6.3.3.0 |
| Temperature | Corrosion and oxidation resistance to about 1,800 °F | MIL-HDBK-5J, par. 6.3.3.0 |
| Condition | Annealed at 1,700 to 1,900 °F | MIL-HDBK-5J, par. 6.3.3.0 |
| Sheet, strip, plate | AMS 5599, annealed | MIL-HDBK-5J, Table 6.3.3.0(a) |
| Bar, forging, ring | AMS 5666, annealed | MIL-HDBK-5J, Table 6.3.3.0(a) |
| Welding | Can be welded by common industrial practices | MIL-HDBK-5J, par. 6.3.3.0 |
Design allowables — Inconel 625 sheet and plate, annealed (AMS 5599)
Strength in ksi. MIL-HDBK-5J Table 6.3.3.0(b), p. 6-35.
| Thickness, in | Basis | Ftu LT | Fty LT | Fsu |
|---|---|---|---|---|
| 0.062 and under | A | 120 | 57 | 79 |
| 0.063–0.109 | A | 120 | 56 | 79 |
| 0.110–0.140 | A | 120 | 55 | 79 |
| 0.141–0.187 | A | 119 | 54 | 79 |
| 0.188–0.250 | S | 120 | 60 | 79 |
| 0.251–1.000 | S | 120 | 60 | — |
Elongation 30 percent (S basis, LT). E = 29.8 × 10³ ksi, G = 11.8 × 10³ ksi, density 0.305 lb/in³. B-basis values and L-direction values are in the table.
Notes from the guide
- Annealed values only. Cold work before annealing changes them.
- Powerplant material. The engine manufacturer's manual governs any repair.
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Sources
- MIL-HDBK-5J, Metallic Materials and Elements for Aerospace Vehicle Structures (31 Jan 2003) — par. 6.3.3.0 and Tables 6.3.3.0(a), (b), pp. 6-34 and 6-35. Cancelled; superseded by MMPDS.
- FAA-H-8083-31B, Aviation Maintenance Technician Handbook, Airframe, Volume 1 — Working Inconel Alloys 625 and 718, p. 4-82, Figure 4-166.
- MMPDS (formerly MIL-HDBK-5) — the current home of design allowables. A repair substantiation cites MMPDS or the SRM, not a website.
- Special Metals, Inconel alloy 625 — Limiting chemical composition.
Educational reference only. not approved data. Always consult the applicable SRM, AMM, or AC 43.13-1B and your certifying authority.