Nickel Iron Alloy,ASTM F30,50Ni50Fe Alloy,E FORU

### **Product Introduction: Nickel Iron Alloy (ASTM F30, 50Ni50Fe Alloy)** **50Ni50Fe Alloy** is a precision nickel-iron alloy manufactured in accordance with ASTM F30 specifications, containing approximately 50% nickel and 50% iron. This specialized alloy is engineered to provide a unique combination of controlled thermal expansion characteristics, excellent magnetic properties, and reliable mechanical performance. The balanced composition offers thermal expansion properties that bridge the gap between low-expansion Invar-type alloys and higher-expansion stainless steels, making it ideal for applications requiring precise dimensional stability under varying thermal conditions. The alloy demonstrates good fabricability, consistent performance characteristics, and reliable service in both electronic and industrial applications where thermal management and dimensional precision are critical requirements. --- #### **1. Chemical Composition (Weight %)** The chemical composition of 50Ni50Fe alloy per ASTM F30 specifications is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | 49.0 - 51.0 | **Carbon (C)** | 0.05 max | | **Iron (Fe)** | Balance | **Manganese (Mn)** | 0.50 max | | **Cobalt (Co)** | 0.50 max | **Silicon (Si)** | 0.30 max | | **Copper (Cu)** | 0.20 max | **Sulfur (S)** | 0.02 max | | **Phosphorus (P)** | 0.02 max | **Other Elements** | 0.50 max | --- #### **2. Physical & Mechanical Properties** **Physical Properties:** | Property | Metric Units | Imperial Units | |----------|-----------------|------| | **Density** | 8.25 g/cm³ | 0.298 lb/in³ | | **Melting Point** | 1425 °C | 2597 °F | | **Curie Temperature** | 360 °C | 680 °F | | **Thermal Conductivity** | 19.0 W/m·K | 132 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 9.5 μm/m·°C | 5.3 μin/in·°F | | **Specific Heat** | 515 J/kg·K | 0.123 Btu/lb·°F | | **Electrical Resistivity** | 0.45 μΩ·m | 270 Ω·cir mil/ft | **Mechanical Properties:** | Property | Value | |----------|-----------------| | **Tensile Strength** | 520 MPa | 75 ksi | | **Yield Strength (0.2% Offset)** | 280 MPa | 41 ksi | | **Elongation** | 35% | | **Hardness (Rockwell B)** | 75 HRB | | **Modulus of Elasticity** | 155 GPa | 22.5 x 10⁶ psi | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Controlled Thermal Expansion**: Intermediate coefficient of thermal expansion between Invar alloys and stainless steels - **Good Magnetic Properties**: Exhibits soft magnetic characteristics with moderate permeability - **Excellent Dimensional Stability**: Maintains precise dimensions under thermal cycling conditions - **Good Machinability**: Can be machined using conventional methods and equipment - **Weldability**: Suitable for welding with proper techniques and parameters - **Thermal Conductivity**: Balanced thermal management properties for various applications **Product Applications:** 50Ni50Fe alloy serves critical functions in multiple precision industries: - **Electronics & Semiconductor Manufacturing**: - Lead frames and semiconductor packaging components - Electronic connectors and electrical headers - Vacuum tube components and assemblies - Microwave and RF tube parts - **Precision Instrumentation**: - Bimetal thermostats and thermal actuators - Precision measuring equipment components - Optical mounting and alignment systems - Laboratory instrument structural parts - **Automotive & Aerospace**: - Sensor components and housing - Navigation system parts - Satellite and spacecraft components - Avionics packaging and thermal management - **Industrial Applications**: - Glass-to-metal sealing applications - Thermostatic elements and controls - Precision molds and tooling components - Temperature-compensating mechanisms --- #### **4. International Standards & Specifications** 50Ni50Fe alloy complies with the following international standards: **Primary Specifications:** - **ASTM F30**: Standard Specification for Iron-Nickel Sealing Alloys **International Equivalents:** - **UNS**: K94890 (50Ni-50Fe) - **EN**: NiFe50 (European designation) - **DIN**: 2.4150 - **JIS**: NCF 1 - **AMS**: 7710 (Brazing Alloy Applications) **Industry Specifications:** - **MIL-SPEC**: MIL-I-23011 - **ISO**: Relevant international standards for nickel-iron alloys --- #### **Summary of Key Advantages** - **Optimized Thermal Performance**: Controlled thermal expansion for precise engineering applications - **Proven Reliability**: Established performance history in critical applications - **Excellent Fabricability**: Suitable for machining, forming, and welding operations - **Consistent Quality**: Reproducible properties meeting ASTM F30 requirements - **Versatile Application Range**: Suitable for electronics, instrumentation, and industrial uses - **Cost-Effective Solution**: More economical than specialized low-expansion alloys while maintaining performance **Technical Note**: The thermal expansion characteristics of 50Ni50Fe alloy can be modified through specific heat treatments and processing conditions to meet particular application requirements. The alloy typically requires annealing in hydrogen or vacuum atmosphere to achieve optimal magnetic and thermal properties. For glass-to-metal sealing applications, proper surface preparation and oxidation control are essential for successful performance. The material's Curie temperature of approximately 360°C defines its upper operational limit for magnetic applications, while mechanical properties remain stable to higher temperatures. Proper handling and storage procedures are recommended to prevent surface contamination that could affect subsequent processing or performance in final applications.

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 3163 gallon liquid totes Special package is available on request.