Inconel 718
Inconel 718 is a precipitation-hardenable nickel-chromium alloy containing niobium and molybdenum. It is valued for very high strength, good fatigue resistance and useful corrosion resistance over a broad temperature range.
Inconel 718 Information
Inconel 718 is a precipitation-hardenable nickel-chromium alloy containing niobium and molybdenum. It is valued for very high strength, good fatigue resistance and useful corrosion resistance over a broad temperature range.
Metallic winding and compatible ring components where service conditions are suitable.
| Material specification | ASTM B670 |
|---|---|
| Specified grade / UNS | Alloy 718 N07718 |
Inconel 718 Chemical Composition
ASTM B670 · Grade-specific requirements
| Element / requirement | Value |
|---|---|
| C % | ≤0.080 |
| Mn % | ≤0.35 |
| Si % | ≤0.35 |
| P % | ≤0.015 |
| S % | ≤0.015 |
| Cr % | 17.0–21.0 |
| Co % | ≤1.0 if determined |
| Mo % | 2.80–3.30 |
| Nb + Ta % | 4.75–5.50 |
| Ti % | 0.65–1.15 |
| Al % | 0.20–0.80 |
| Fe | Remainder |
| Cu % | ≤0.30 |
| Ni % | 50.0–55.0 |
| B % | ≤0.006 |
Inconel 718 Mechanical Properties
ASTM B670 · Grade-specific requirements
| Product form / condition | Tensile min (MPa) | Yield min (MPa) | Elongation min (%) | Hardness |
|---|---|---|---|---|
| After precipitation heat treatment · ≤1.0 in. (25.4 mm) | 1241 | 1034 | 12 | — |
| After precipitation heat treatment · >1.0–2.25 in. (25.4–57.2 mm) | 1241 | 1034 | 10 | — |
ASTM B670 Additional Tests
| Nominal thickness | Stress (MPa) | Life min (h) | Elongation min (%) |
|---|---|---|---|
| ≤0.015 in. (0.38 mm) | 655 | 23 | — |
| >0.015–0.025 in. (0.38–0.64 mm) | 655 | 23 | 4 |
| >0.025–1.5 in. (0.64–38.1 mm) | 690 | 23 | 4 |
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