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.
| UNS Number | N07718 |
|---|---|
| Common Product Specifications | ASTM B637 / AMS specifications |
| Material Type | Ni-Cr-Fe-Nb-Mo precipitation-hardening alloy |
| Common / Applicable Specification | ASTM B637 / applicable product specification |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
Inconel 718 Chemical Composition
Reference composition limits are shown below. Exact requirements should be confirmed against the applicable product specification and certified material documentation.
| Element / Constituent | Symbol | Composition / Information |
|---|---|---|
| Nickel | Ni | 50.0–55.0 |
| Chromium | Cr | 17.0–21.0 |
| Iron | Fe | Balance |
| Niobium + Tantalum | Nb+Ta | 4.75–5.50 |
| Molybdenum | Mo | 2.80–3.30 |
| Titanium | Ti | 0.65–1.15 |
| Aluminium | Al | 0.20–0.80 |
| Carbon | C | 0.08 max. |
| Cobalt | Co | 1.00 max. |
Inconel 718 Mechanical Properties
Reference room-temperature properties are shown for a commonly supplied condition. Exact requirements depend on product form, size, heat treatment and governing specification.
| Property | Reference Value | Unit / Basis |
|---|---|---|
| Tensile Strength | Typical aged ≈1240–1450 | MPa |
| 0.2% Offset Yield Strength | Typical aged ≈1030–1200 | MPa |
| Elongation | Typical aged ≈12–20 | % |
Values shown are engineering reference data, not universal design allowables. Final procurement and design must use the governing specification, exact product form/condition and certified material test documentation.
Inconel 718 Physical & Service Information
Reference physical properties and service considerations relevant to material selection for Spiral Wound Gaskets.
| Density | Approx. 8.19 g/cm³ |
|---|---|
| Structure | Precipitation-hardenable nickel-base alloy |
| Strength Behaviour | Very high strength after solution treatment and aging. |
| Heat Treatment | Mechanical properties depend strongly on solution and aging schedule. |
| Service Selection | Use the exact product specification and certified heat-treatment condition for engineering values. |
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