Monel 400
Monel 400 is a nickel-copper alloy known for good resistance to seawater, hydrofluoric acid and many neutral or reducing environments. It retains useful mechanical properties across a broad temperature range.
Monel 400 Information
Monel 400 is a nickel-copper alloy known for good resistance to seawater, hydrofluoric acid and many neutral or reducing environments. It retains useful mechanical properties across a broad temperature range.
Metallic winding and compatible ring components where service conditions are suitable.
| UNS Number | N04400 |
|---|---|
| Common Product Specification | ASTM B127 |
| Material Type | Nickel-copper solid-solution alloy |
| Common / Applicable Specification | ASTM B127 (plate/sheet/strip) |
| Typical Gasket Use | Metallic winding and compatible ring components where service conditions are suitable. |
Monel 400 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 + Cobalt | Ni+Co | 63.0 min. |
| Copper | Cu | 28.0–34.0 |
| Iron | Fe | 2.5 max. |
| Manganese | Mn | 2.0 max. |
| Carbon | C | 0.30 max. |
| Silicon | Si | 0.50 max. |
| Sulfur | S | 0.024 max. |
Monel 400 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 | ≈480 min. | MPa |
| 0.2% Offset Yield Strength | ≈170 min. | MPa |
| Elongation | ≈35 min. | % |
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.
Monel 400 Physical & Service Information
Reference physical properties and service considerations relevant to material selection for Spiral Wound Gaskets.
| Density | Approx. 8.80 g/cm³ |
|---|---|
| Structure | Single-phase nickel-copper solid solution |
| Corrosion Behaviour | Good resistance to flowing seawater and many reducing chemicals; not universally resistant to oxidizing acids. |
| Heat Treatment | Strength is controlled mainly by cold work, not precipitation hardening. |
| Service Selection | Check compatibility with oxidizing contaminants and galvanic conditions. |
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