Description (English)
Shanghai Vertex Alloy Co., Ltd (Vertex Alloy) supplies Monel Alloy 404 (UNS N04404) strip, wire, rod and bar to ASTM F96-77 (Reapproved 2015). F96 designates N04404 as Alloy 4 (55Ni-45Cu) under Table 1 — the standard specification for electronic-grade Cu-Ni alloys in wrought forms for electron devices. With Ni 52–57%, Cu balance and tight limits on Fe/Mn/Si/Al, N04404 achieves magnetic permeability μ ≈ 1.0017 (effectively non-magnetic, vacuum-level), Curie temperature ≤ -100 °C (well below ambient), and electrical resistivity 0.494 µΩ·m. The high Cu content delivers excellent brazing and ceramic-to-metal sealing — making 404 the standard choice for transistor headers, ceramic-to-metal seals, electron-tube components, relays, MRI-compatible fixturing and compass-free instruments. As with all Monel grades, it is a single-phase solid solution and cannot be hardened by heat treatment; strengthening is by cold work only, to about 850 MPa tensile maximum. Strip 0.05–3 mm, foil down to 0.01 mm on request, wire Ø 0.1–8 mm, rod/bar Ø 6–100 mm. Annealed tempers include controlled grain size for deep drawing per F96 Section 8. EN 10204 3.1 mill certificate. MONEL® is a registered trademark of Special Metals Corporation; Shanghai Vertex Alloy is not affiliated with Special Metals.
Size Range
- Strip Thickness 0.05 – 3 mm
- Foil Thickness 0.01 – 0.05 mm on request
- Wire Diameter 0.1 – 8 mm
- Rod / Bar Diameter 6 – 100 mm
- Strip Width Per coil / cut-to-width on request
Grade Specification
| System | Value |
|---|---|
| USA (UNS) | N04404 |
| Trade Name (Special Metals) | MONEL® Alloy 404 |
| ASTM F96 Alloy Number | Alloy 4 (55 Ni – 45 Cu) |
| Common Name (informal) | Ni55Cu45 |
| Europe (DIN) | No direct W.-Nr. equivalent (DIN 17471 generic Cu-Ni strip) |
| China (GB) | No dedicated national grade; closest generic 65Ni-28Cu / NCu28-2.5-1.5 (approximate) |
| Principal Standard | ASTM F96-77 (Reapproved 2015) |
| Reference Standards | ASTM B127, B163, B165, DIN 17471 |
Chemical Composition
| Element | Value |
|---|---|
| Ni (incl. Co) | 52.0 – 57.0 |
| Cu | Balance |
| Fe | ≤ 0.50 |
| Mn | ≤ 0.10 |
| Si | ≤ 0.10 |
| C | ≤ 0.15 |
| S | ≤ 0.015 |
| Al | ≤ 0.05 |
| P | ≤ 0.03 |
| Zn | ≤ 0.02 |
| Pb | ≤ 0.01 |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 483 MPa (70 ksi) |
| Yield (0.2%) | ≥ 172 MPa (25 ksi) |
| Elongation | ≥ 35% |
| Hardness | ≤ 150 HB |
Physical Properties
| Property | Unit | Value |
|---|---|---|
| Density | - | 8.91 g/cm³ |
| Melting Range | - | 1300 – 1350 °C |
| Thermal Conductivity (21 °C) | - | 13.4 – 21.8 W/(m·K) |
| Electrical Resistivity (21 °C) | - | 0.494 µΩ·m |
| Specific Heat | - | 414 J/(kg·K) |
| CTE (20 – 300 °C) | - | 13.3 – 13.9 × 10⁻⁶ /K |
| Elastic Modulus | - | 169 – 176 GPa |
| Poisson's Ratio | - | 0.295 |
| Magnetic Permeability (μ) | - | ≈ 1.0017 (essentially vacuum-level) |
| Curie Temperature | - | ≤ -100 °C (no ferromagnetic transition in service) |
Applications
- Electronic Devices:Transistor headers / cans; Ceramic-to-metal seal eyelets & ferrules; Electron tubes, vacuum-tube components;Relay parts (non-magnetic);Waveguide flanges (low eddy current)
- Semiconductor: Lead frames, base plates
- Precision Instruments:Compass-free instrument housings
- Medical Imaging:MRI-compatible fixturing and housings
- Marine:Non-magnetic marine fasteners, instrument housings
- Chemical (specialty):HF / fluoride handling parts, hot concentrated alkali service
- Brazing:High-Cu component for brazing assemblies