Monel K-500 vs Monel 400: Same Ni-Cu base — K-500 adds precipitation hardening via Al/Ti
Monel K-500 vs Monel 400
Side-by-side chemical composition and mechanical property comparison.
Overview
Monel K-500
2.4375
Age-hardenable version of Monel 400. Al and Ti additions enable precipitation hardening to double the strength of Monel 400. Retains excellent seawater and HF acid resistance. Used for pump shafts, impellers, doctor blades, oil well tools, and marine fasteners.
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.
| Monel K-500 | Monel 400 | |
|---|---|---|
| Material Number | 2.4375 | 2.4360 |
| Category | Nickel Alloys | Nickel Alloys |
| Standard | ASTM B865 | ASTM B127 |
Chemical composition (wt%)
| Element | Monel K-500 | Monel 400 | Overlap |
|---|---|---|---|
| C | 0–0.25% | 0–0.3% | OK |
| Si | 0–0.5% | 0–0.5% | OK |
| Mn | 0–1.5% | 0–2% | OK |
| S | — | 0–0.024% | — |
Mechanical properties
| Property | Monel K-500 | Monel 400 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 1035 | ≥ 480 | MPa |
| yield_strength | ≥ 725 | ≥ 170 | MPa |
| elongation | ≥ 15 | ≥ 35 | % |
Compatibility Assessment
K-500 reaches 1035 MPa UTS (vs 480 MPa for 400) through age hardening. Both have same corrosion resistance profile. K-500 costs more and requires heat treatment. Choose K-500 for high-strength marine applications.
Frequently Asked Questions
Is Monel K-500 the same as Monel 400?
Monel K-500 and Monel 400 have a 70% composition overlap. Same Ni-Cu base — K-500 adds precipitation hardening via Al/Ti
Can I replace Monel K-500 with Monel 400?
In many cases, yes. The compositions overlap significantly (70%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between Monel K-500 and Monel 400?
The main differences are in the following elements: Cu. Monel K-500 is a Nickel Alloys grade, while Monel 400 is a Nickel Alloys grade.
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Data provided for reference only. Always verify against the applicable specification for critical applications.
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