Alloy 404,Monel 404 Wire,,E FORU

British Specs:，American Specs:，German Specs:

### **Product Datasheet: Alloy 404 / Monel® 404 Wire** **A Low-Permeability, High-Conductivity Nickel-Copper Alloy Wire for Critical Electrical and Electronic Applications** --- #### **Overview** Alloy 404 (Monel 404) Wire is a precision-drawn form of a specialized nickel-copper alloy, renowned for its unique combination of exceptionally low magnetic permeability and good electrical conductivity. The wire is produced with stringent controls to maintain the alloy's core characteristic: a magnetic permeability that remains stable and below 1.005, even after significant cold drawing. This makes it an indispensable material for the electronics and electrical industries where magnetic interference must be eliminated. It is available in a wide range of diameters and tempers, from soft annealed for forming to hard drawn for spring applications. --- #### **Key Features & Advantages** * **Guaranteed Low Magnetic Permeability:** The primary feature, with permeability **< 1.005**, ensures it is effectively non-magnetic, critical for sensitive instruments. * **Excellent Electrical Conductivity:** Offers higher conductivity than many other nickel-based alloys, making it suitable for carrying current in non-magnetic systems. * **Good Corrosion Resistance:** Provides excellent resistance to atmospheric corrosion, fresh water, and steam, ensuring long-term reliability. * **High Strength and Durability:** Especially in hard-drawn tempers, it offers superior strength and fatigue resistance compared to copper or aluminum wires. * **Excellent Formability (Annealed Temper):** Can be easily wound, coiled, and formed into complex shapes. * **Superior Brazing Performance:** Low iron and cobalt content prevent embrittlement during high-temperature brazing in hydrogen atmospheres, ideal for lead wires and seals. --- #### **Chemical Composition (Weight % - Typical)** The composition is meticulously controlled to ensure consistent performance in wire form. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 52.0 - 57.0 | | **Copper (Cu)** | Balance | | **Manganese (Mn)** | 0.10 max | | **Iron (Fe)** | 0.25 max | | **Silicon (Si)** | 0.10 max | | **Carbon (C)** | 0.15 max | | **Sulfur (S)** | 0.024 max | | **Cobalt (Co)** | 0.10 max | | **Magnesium (Mg)** | 0.05 - 0.15 | *Note: The critically low Iron and Cobalt content is essential for the wire's non-magnetic properties.* --- #### **Physical & Mechanical Properties** Properties vary significantly with temper (annealed vs. hard drawn). | Property | Condition / Value (Typical) | | :--- | :--- | | **Density** | 8.91 g/cm³ (0.322 lb/in³) | | **Melting Point** | 1300 - 1350 °C (2370 - 2460 °F) | | **Electrical Resistivity** | ~29 μΩ·cm at 20°C | | **Thermal Conductivity** | ~29 W/m·K at 20°C | | **Tensile Strength (Annealed)** | 380 - 480 MPa (55 - 70 ksi) | | **Tensile Strength (Hard Drawn)** | 550 - 690 MPa (80 - 100 ksi) | | **Elongation (Annealed)** | 35 - 45% | | **Magnetic Permeability** | **< 1.005** (All Tempers) | --- #### **Standard Forms & Available Tempers** * **Form:** Round wire, flat wire. * **Diameter (Round Wire):** From fine gauges of 0.05 mm (0.002") up to several millimeters. * **Temper:** * **Annealed (Soft):** Fully softened for maximum ductility, used for coiling, weaving, and forming. * **Hard Drawn:** High strength and spring temper, used for springs, clips, and structural leads. * **Quarter-Hard, Half-Hard:** Intermediate tempers for specific strength and formability requirements. * **Surface Finish:** Standard bright finish, or cleaned for specific brazing applications. --- #### **International Standards** Alloy 404 Wire is primarily governed by the following standards: * **ASTM B164 / B164M:** Standard Specification for Nickel-Copper Alloy (UNS N04400, N04404, N04405) Rod, Bar, and Wire. This is the primary specification. * **UNS (Unified Numbering System):** **N04404** * **AMS (Aerospace Material Specification):** **AMS 4571** (Bar and Forging Stock, often referenced for chemistry). * **ISO (International Organization for Standardization):** While not as common as ASTM, equivalent specifications can be sourced from suppliers. * **RWMA (Resistance Welder Manufacturers' Association):** Sometimes referenced for electrical applications. --- #### **Product Applications** Alloy 404 Wire is specified in applications where its non-magnetic nature and specific properties are critical. * **Lead Wires for Electronic Tubes & Components:** Internal wiring in vacuum tubes, capacitors, and other components where magnetic fields must be avoided. * **Glass-to-Metal Seal Leads:** Used in hermetic connectors, feedthroughs, and semiconductor packages because its thermal expansion coefficient matches certain sealing glasses. * **Non-Magnetic Springs and Clips:** For instruments, gyroscopes, and guidance systems where magnetic interference would cause errors. * **Brazing and Welding Wire:** Used as a filler metal for joining components where a non-magnetic, corrosion-resistant weld is required. * **Resistance Welding Electrodes:** For specialized welding of non-ferrous materials. * **Shielding and Screening:** Woven into mesh or used as a continuous shield for sensitive cables and equipment. * **Critical Fasteners:** Non-magnetic nuts, bolts, and pins in scientific and marine environments. --- #### **Why Choose Alloy 404 Wire Over Other Materials?** * **vs. Copper Wire:** Alloy 404 offers significantly higher strength, better corrosion resistance, and a guaranteed non-magnetic property, which copper cannot reliably provide due to potential magnetic impurities. * **vs. Monel 400 Wire:** The key differentiator is the controlled low permeability. Monel 400 wire, with its higher iron content, can become slightly magnetic after cold drawing. * **vs. Pure Nickel Wire:** Alloy 404 is typically more cost-effective and possesses a more stable, lower permeability than commercially pure nickel. --- **Disclaimer:** *Monel® is a registered trademark of Special Metals Corporation (a PCC company).* The information provided is typical and for reference purposes only. Mechanical properties are highly dependent on wire diameter and temper. For critical applications, users should conduct their own tests and consult directly with the material supplier for specific technical data.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2949 gallon liquid totes Special package is available on request.