Inconel 718 vs Monel 400: 19% composition overlap. Significantly different materials serving different application areas.
Inconel 718 vs Monel 400
Side-by-side chemical composition and mechanical property comparison.
Overview
Inconel 718
2.4668
THE most widely used aerospace superalloy. Precipitation-hardened Ni-Cr-Fe alloy strengthened by gamma-prime and gamma-double-prime phases (Nb). Unique slow aging kinetics allow welding without cracking. UTS >1275 MPa aged. Used for gas turbine discs, jet engine components, rocket motors, cryogenic tanks, and oil/gas downhole tools. Service to 700°C.
Monel 400
2.4360
Nickel-copper alloy with excellent resistance to seawater, hydrofluoric acid, and alkaline environments. One of the few alloys resistant to HF acid at all concentrations. Used for marine engineering, chemical processing, oil refinery piping, and valve/pump components.
| Inconel 718 | Monel 400 | |
|---|---|---|
| Material Number | 2.4668 | 2.4360 |
| Category | Nickel Alloys | Nickel Alloys |
| Standard | ASTM B637 | ASTM B127 |
Chemical composition (wt%)
| Element | Inconel 718 | Monel 400 | Overlap |
|---|---|---|---|
| C | 0–0.08% | 0–0.3% | OK |
| Si | 0–0.35% | 0–0.5% | OK |
| Mn | 0–0.35% | 0–2% | OK |
| S | — | 0–0.024% | — |
Mechanical properties
| Property | Inconel 718 | Monel 400 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 1275 | ≥ 480 | MPa |
| yield_strength | ≥ 1034 | ≥ 170 | MPa |
| elongation | ≥ 12 | ≥ 35 | % |
Compatibility Assessment
Inconel 718 and Monel 400 have significantly different compositions (19% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is Inconel 718 the same as Monel 400?
Inconel 718 and Monel 400 have a 19% composition overlap. They are generally not directly interchangeable.
Can I replace Inconel 718 with Monel 400?
Generally not recommended. The compositions differ significantly (19% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between Inconel 718 and Monel 400?
The main differences are in the following elements: Ni, Cu. Inconel 718 is a Nickel Alloys grade, while Monel 400 is a Nickel Alloys grade.
Related Comparisons
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.