Nickel-copper alloy offering exceptional resistance to seawater, marine atmospheres, and biofouling.
Outstanding performance in hydrofluoric and sulfuric acid environments for chemical processing applications.
Maintains high strength and toughness from cryogenic temperatures up to 480°C (900°F).
Available in bar, sheet, plate, pipe, fittings, wire, and forgings to suit diverse requirements.
Monel 400 is a nickel-copper alloy known for its excellent corrosion resistance, especially in marine and chemical environments.
As a reliable Monel 400 supplier, Hengyi Metal offers high-quality materials for various industrial applications.
We are also a professional nickel alloy supplier providing various materials.
Contact us now for a quotation.
Email: sales@hengyimetal.com
WhatsApp: +86 19521258704
Product Details
Monel 400 (UNS N04400, W.N.r 2.4360) is a solid-solution alloy that exhibits exceptional resistance to chloride ion stress corrosion cracking and performs reliably in reducing environments. The alloy remains ductile and tough at sub-zero temperatures while resisting oxidation at elevated temperatures up to 760°C (1400°F) in intermittent service. Typical applications include marine hardware, chemical processing equipment, heat exchangers, pump shafts, valve components, and aerospace fuel systems. Each product is supplied with full material traceability and mill test certificates (EN 10204 Type 3.1) upon request.
Technical Specifications
| Parameter | Details |
|---|---|
| UNS Number | N04400 |
| W.N.r | 2.4360 |
| Standards | ASTM B127, B164, B165, B366, ASME SB-127, SB-164, SB-165, AMS 4574, AMS 4675 |
| Density | 8.80 g/cm³ (0.318 lb/in³) |
| Melting Range | 1300 – 1350°C (2370 – 2460°F) |
| Tensile Strength (Annealed) | 480 – 620 MPa |
| Yield Strength (Annealed) | 170 – 340 MPa |
| Elongation (Annealed) | 35 – 60% |
| Hardness (Annealed) | 135 – 185 HB |
Chemical Composition
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 63.0 – 70.0 |
| 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 |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.80 g/cm³ (0.318 lb/in³) |
| Melting Range | 1300 – 1350°C (2370 – 2460°F) |
| Electrical Resistivity | 0.547 µΩ·m (20°C) |
| Thermal Conductivity | 21.8 W/m·K (20°C) |
| Coefficient of Thermal Expansion | 13.9 µm/m·°C (20 – 100°C) |
| Modulus of Elasticity | 179 GPa |
| Magnetic Properties | Slightly magnetic (cold worked), non-magnetic (annealed) |
Mechanical Properties (Annealed)
| Property | Typical Value |
|---|---|
| Tensile Strength | 480 – 620 MPa (70 – 90 ksi) |
| Yield Strength (0.2% Offset) | 170 – 340 MPa (25 – 50 ksi) |
| Elongation | 35 – 60% |
| Hardness | 135 – 185 HB |
| Impact Strength (Charpy V-Notch) | 120 – 200 J |
Available Forms & Specifications
| Product Form | Size Range | Specifications |
|---|---|---|
| Bar & Rod | 3mm – 300mm diameter | ASTM B164, ASME SB-164, AMS 4675 |
| Sheet & Plate | 0.5mm – 100mm thickness | ASTM B127, ASME SB-127, AMS 4574 |
| Pipe & Tube | Custom sizes | ASTM B165, ASME SB-165, ASTM B725 |
| Fittings | Custom configurations | ASTM B366, ASME SB-366 |
| Wire | 0.1mm – 12mm diameter | ASTM B164 |
| Forgings | Custom configurations | ASTM B564, ASME SB-564 |
Applications
| Industry | Applications |
|---|---|
| Marine | Pump shafts, propeller shafts, seawater valves, marine hardware, boat fittings |
| Chemical Processing | Heat exchangers, evaporators, pressure vessels, reactor vessels, piping systems |
| Oil & Gas | Downhole tools, wellhead components, sour gas service equipment |
| Aerospace | Fuel systems, hydraulic systems, engine components |
| Electronics | Spring contacts, electrical connectors |
| General Industrial | Valve components, pump components, fasteners, chains, springs |
Corrosion Resistance
Monel 400 exhibits excellent resistance to:
| Environment | Resistance Level |
|---|---|
| Seawater & Marine Atmospheres | Excellent – resistant to biofouling and crevice corrosion |
| Hydrofluoric Acid (all concentrations) | Exceptional – preferred material for HF service |
| Sulfuric Acid | Good – in reducing conditions, up to moderate concentrations |
| Hydrochloric Acid | Fair to good – in reducing conditions, limited to low concentrations |
| Alkalis (Caustic Soda, etc.) | Excellent – including high-temperature caustic environments |
| Chloride Ion Stress Corrosion Cracking | Excellent – virtually immune |
| Neutral & Alkaline Salt Solutions | Excellent |
Fabrication & Welding
| Process | Suitability |
|---|---|
| Cold Forming | Excellent – work hardens rapidly, intermediate annealing may be required |
| Hot Forming | Good – 950 – 1175°C range |
| Machining | Fair to good – work hardens, use sharp tools and positive feeds |
| Gas Tungsten Arc Welding (GTAW/TIG) | Excellent |
| Gas Metal Arc Welding (GMAW/MIG) | Excellent |
| Shielded Metal Arc Welding (SMAW) | Good |
| Submerged Arc Welding (SAW) | Good |
Recommended Filler Metals: ERNiCu-7 (AWS A5.14), ENiCu-7 (AWS A5.11), W.N.r 2.4375
Frequently Asked Questions
Q: What is Monel 400 used for?
A: Monel 400 is widely used in marine applications (pump shafts, valves, hardware), chemical processing equipment (heat exchangers, pressure vessels), and aerospace fuel systems due to its exceptional corrosion resistance and high strength.
Q: Is Monel 400 magnetic?
A: In the annealed condition, Monel 400 is non-magnetic. However, cold working can induce slight magnetic properties.
Q: Can Monel 400 be welded?
A: Yes, Monel 400 exhibits excellent weldability using standard welding processes with ERNiCu-7 filler metal. No preheating is required for most applications.
Q: What is the difference between Monel 400 and Monel K-500?
A: Monel K-500 is an age-hardenable version of Monel 400 with added aluminum and titanium, offering higher strength and hardness. Monel 400 is used where maximum corrosion resistance and good formability are required.
Learn more about Monel 400 properties and applications
Read comparosom：Monel K500 VS Monel 400
Learn more about real-world usage in our guide:
- Inconel 600 VS Inconel 625
- Hastelloy C22 vs C276 Comparison
Hastelloy c2000-guide - Inconel 718 Properties
- Incoloy 800 VS Inconel 600
- Inconel X-750 VS Inconel 718
For a broader overview, see our guide on what are nickel alloys
