Iron 50/Nickel 50 Alloy,Iron Nickel Alloy,,E FORU

### **Iron-Nickel 50/50 Alloy (FeNi50) - Controlled Expansion Alloy** #### **Overview** **Iron-Nickel 50/50 Alloy** (approximately 50% Fe - 50% Ni) is a precision engineered material belonging to the family of iron-nickel controlled expansion alloys. This specific composition offers a unique combination of tailored thermal expansion characteristics, soft magnetic properties, and excellent mechanical strength. Unlike its more famous cousin Invar (FeNi36) which has ultralow expansion, the 50/50 composition provides a balanced thermal expansion coefficient that bridges the gap between ceramics, glasses, and other metals, making it invaluable for applications requiring precise dimensional stability across temperature ranges. The alloy typically undergoes special heat treatments to optimize its properties for specific applications, particularly in the electronic and telecommunications industries. --- #### **Chemical Composition (Weight % - Typical)** | Element | Content (%) | | :--- | :--- | | **Iron (Fe)** | **Balance** (~49-51%) | | **Nickel (Ni)** | **48.0 - 52.0** | | **Manganese (Mn)** | **0.30 - 0.60** | | **Silicon (Si)** | **0.10 - 0.30** | | **Chromium (Cr)** | **≤ 0.20** | | **Carbon (C)** | **≤ 0.05** | | **Cobalt (Co)** | **≤ 0.50** | | **Copper (Cu)** | **≤ 0.20** | | **Sulfur (S)** | **≤ 0.015** | | **Phosphorus (P)** | **≤ 0.015** | *Note: The composition is tightly controlled to maintain consistent thermal and magnetic properties. Minor variations can significantly affect performance characteristics.* --- #### **Physical & Mechanical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 8.25 g/cm³ | | **Melting Point** | ~1420-1460 °C (2590-2660 °F) | | **Mean Coefficient of Thermal Expansion (CTE)** | **~9.5-10.5 × 10⁻⁶/°C** (20-300°C) | | **Thermal Conductivity** | 18-22 W/m·K (at 20°C) | | **Electrical Resistivity** | 0.45-0.50 μΩ·m | | **Curie Temperature** | ~480-520 °C (896-968 °F) | | **Elastic Modulus** | 150-165 GPa | | **Tensile Strength** | 520-620 MPa (annealed) | | **Yield Strength** | 280-380 MPa (annealed) | | **Elongation** | 30-40% (annealed) | | **Hardness** | 150-180 HV (annealed) | | **Saturation Induction** | ~1.5-1.6 T | --- #### **Key Characteristics & Applications** **Key Characteristics:** 1. **Controlled Thermal Expansion**: The CTE is carefully engineered to match various technical ceramics, glasses, and semiconductor materials 2. **Excellent Soft Magnetic Properties**: High permeability and low coercivity make it suitable for AC applications 3. **Good Mechanical Strength**: Maintains structural integrity under thermal cycling conditions 4. **Excellent Sealing Capability**: Forms reliable hermetic seals with matched-expansion materials 5. **Good Corrosion Resistance**: Superior to plain carbon steels in many environments **Typical Applications:** - **Electronics & Semiconductor**: Lead frames, packages, and support structures for semiconductor devices - **Telecommunications**: Waveguide tubes, microwave components, and RF connectors - **Aerospace & Defense**: Precision instruments, gyroscopes, and navigation equipment - **Medical Devices**: MRI components, surgical instruments, and implantable device housings - **Industrial**: Glass-to-metal seals, thermostats, and precision measurement equipment - **Power Electronics**: Transformer cores and magnetic shields --- #### **International Standards** | Standard Organization | Designation | Description | | :--- | :--- | :--- | | **ASTM** | **F30** | Standard specification for iron-nickel sealing alloys | | **IEC** | **60404-8-6** | International standard for soft magnetic metals | | **JIS** | **C2531** | Japanese industrial standard for 50% Ni-Fe alloy | | **GB/T** | **n/a** | Chinese standards for precision alloys | | **UNS** | **K94800** | Unified numbering system classification | *Note: The alloy is often supplied under manufacturer-specific designations and may be customized for particular applications.* --- #### **Summary** The **Iron-Nickel 50/50 Alloy** represents a critical material in precision engineering applications where controlled thermal expansion and reliable magnetic performance are essential. Its ability to maintain dimensional stability while providing excellent functional properties makes it indispensable in advanced electronic, telecommunications, and aerospace systems. The alloy's balanced characteristics – neither ultra-low expansion like Invar nor high permeability like 80% nickel alloys – position it uniquely in the materials spectrum for applications requiring predictable, intermediate thermal expansion behavior coupled with good magnetic response.

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 3211 gallon liquid totes Special package is available on request.