Alloy 404 (UNS N04404): Low-Permeability Nickel-Copper Alloy for Electronic & Corrosive EnvironmentsMonel® 404 is a nickel-copper alloy engineered for applications demanding high strength, corrosion resistance, and controlled physical properties. It is specifically formulated to maintain low magnetic permeability while offering good brazing characteristics, making it suitable for sensitive electronic assemblies and harsh industrial environments.
1. Product Specifications & AvailabilityAlloy 404 (UNS N04404) is available in multiple forms for manufacturing and fabrication. Forms: Bar (Round), Flat Bar, Tube, Pipe, Sheet, Plate, Wire, Billet, Forgings. Certifications: ISO 9001 and AS9120 certified. Support: Stock lists and samples available upon request.
Chemical Composition| Element | Content (%) |
|---|
| Nickel | 50 – 57 | | Copper | ≤ 45.5 | | Iron | ≤ 0.50 | | Carbon | ≤ 0.15 | | Manganese | ≤ 0.10 | | Silicon | ≤ 0.10 | | Aluminum | ≤ 0.050 | | Sulfur | 0.024 |
Physical & Mechanical Properties| Property | Metric | Imperial |
|---|
| Density | 8.91 g/cm³ | 0.322 lb/in³ | | Tensile Strength (annealed) | 483 MPa | 70 ksi | | Yield Strength (annealed) | 172 MPa | 25 ksi | | Modulus of Elasticity | 169 GPa | 24500 ksi | | Poisson’s Ratio | 0.295 | 0.295 |
2. Operating Conditions & Selection CriteriaMonel 404 is selected when standard nickel-copper alloys cannot meet magnetic or brazing requirements. Magnetic Properties: Maintains consistently low magnetic permeability, essential for relays, electronic capsules, and hermetic seals where magnetic interference must be minimized. Corrosion Resistance: Offers excellent resistance to seawater, chemical agents, and various corrosive media, supporting long-term reliability in marine and processing equipment. Temperature Range: Retains toughness and strength across a wide temperature range, suitable for power generation and heat exchanger applications.
3. Fabrication Guidelines & Material ComparisonMonel® 404 requires specific processing considerations due to its metallurgical characteristics. Fabrication Guidelines: Machining: Can be machined using conventional techniques standard for iron-based alloys. Welding: Good weldability using common welding methods. Cold Working: Performs well with standard tooling. Soft die materials are recommended for optimal surface finish. Hot Working: Cannot be hot worked. This is a critical limitation compared to other Monel alloys. Forging: Can be forged despite the inability to hot work. Annealing: Perform at 760°C (1400°F) for one hour to relieve stress and achieve optimal softness.
Material Comparison: vs. Monel® 400: Monel® 400 is a general-purpose alloy for high-strength structural components (shafts, pumps, valves) in corrosive environments. Monel® 404 is selected when low magnetic permeability and good brazing characteristics are required, often for electronic components, despite similar corrosion resistance. vs. Monel® 401: Monel® 401 is optimized for electrical resistance applications (resistors). Monel 404 is optimized for low magnetic permeability and brazeability in assemblies like relays and seals.
Primary Applications: Electronic components: capsules, relays, seals (critical low-permeability applications) Marine engineering: fixtures exposed to seawater Chemical processing: corrosion-resistant equipment Oil & Gas: gasoline tanks and storage systems Power generation: boiler feed water heaters, heat exchangers
Contact & SupportFor detailed specifications, pricing, or free samples of Monel® 404, contact ZYTC Alloy. Our team provides certified materials and technical guidance for projects requiring specialized magnetic and corrosion-resistant properties. Contact Us:Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
