Nickel 211 (Nickel Manganese Alloy),ASTM F290,Ni4.75Mn Alloy,E FORU

### **Product Introduction: Nickel 211 (Ni4.75Mn Alloy)** **Nickel 211 (Ni4.75Mn Alloy)** is a nickel-manganese alloy manufactured in accordance with ASTM F290 specifications, containing approximately 4.75% manganese with nickel as the balance. This specialized alloy is engineered to provide superior performance in glass-to-metal sealing applications, offering an optimal combination of thermal expansion characteristics, oxidation resistance, and mechanical properties. The controlled manganese addition significantly enhances the alloy's sealing capabilities while maintaining excellent fabricability and consistent performance in demanding electronic and aerospace applications. The alloy's carefully balanced composition ensures reliable thermal expansion matching with various glass types, making it particularly valuable for hermetic sealing applications where long-term reliability and environmental resistance are critical requirements. --- #### **1. Chemical Composition (Weight %)** The chemical composition of Nickel 211 per ASTM F290 specifications is as follows: | Element | Content (%) | Element | Content (%) | |---------|-------------|---------|-------------| | **Nickel (Ni)** | Balance | **Manganese (Mn)** | 4.2 - 5.2 | | **Iron (Fe)** | 0.25 max | **Carbon (C)** | 0.10 max | | **Copper (Cu)** | 0.05 max | **Silicon (Si)** | 0.10 max | | **Magnesium (Mg)** | 0.05 - 0.15 | **Sulfur (S)** | 0.01 max | | **Other Elements** | 0.50 max | | | --- #### **2. Physical & Mechanical Properties** **Physical Properties:** | Property | Metric Units | Imperial Units | |----------|-----------------|------| | **Density** | 8.84 g/cm³ | 0.319 lb/in³ | | **Melting Point** | 1440 °C | 2624 °F | | **Thermal Conductivity** | 70.0 W/m·K | 485 Btu·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 13.3 μm/m·°C | 7.4 μin/in·°F | | **Specific Heat** | 440 J/kg·K | 0.105 Btu/lb·°F | | **Electrical Resistivity** | 0.16 μΩ·m | 96 Ω·cir mil/ft | | **Magnetic Permeability** | 1.01 max | | **Mechanical Properties:** | Property | Value | |----------|-----------------| | **Tensile Strength** | 450-550 MPa | 65-80 ksi | | **Yield Strength (0.2% Offset)** | 150-250 MPa | 22-36 ksi | | **Elongation** | 35-45% | | **Hardness (Rockwell B)** | 65-75 HRB | | **Modulus of Elasticity** | 180 GPa | 26.1 x 10⁶ psi | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Excellent Glass Sealing Performance**: Optimized thermal expansion matching with various glass types - **Superior Oxidation Resistance**: Forms protective oxide layer for reliable glass adhesion - **Non-Magnetic Properties**: Essentially non-magnetic in annealed condition - **Good Ductility**: Excellent formability for complex component shapes - **Thermal Stability**: Maintains dimensional stability under thermal cycling - **Good Corrosion Resistance**: Suitable for various environmental conditions **Product Applications:** Nickel 211 serves critical functions in hermetic sealing applications across multiple industries: - **Electronics & Semiconductor**: - Transistor and diode packages - Integrated circuit headers - Microwave tube components - Ceramic-to-metal seals - **Aerospace & Defense**: - Hermetic connector seals - Sensor packaging - Avionics component housing - Military communication devices - **Automotive Electronics**: - Sensor encapsulation - Control module packaging - Ignition system components - Power electronic packaging - **Industrial Applications**: - High-reliability electrical feedthroughs - Laboratory instrument seals - Medical device packaging - Optical component housing --- #### **4. International Standards & Specifications** Nickel 211 complies with the following international standards: **Primary Specifications:** - **ASTM F290**: Standard Specification for Round and Flat Glass-to-Metal Sealing Alloys **International Equivalents:** - **UNS**: N02211 - **AMS**: 3900 (Aerospace Material Specification) - **MIL-SPEC**: MIL-N-47173 - **EN**: NiMn5 (European designation) - **DIN**: 2.4215 - **JIS**: NCM 01 --- #### **Summary of Key Advantages** - **Optimized Sealing Performance**: Specifically designed for reliable glass-to-metal seals - **Consistent Thermal Expansion**: Controlled CTE for perfect glass matching - **Excellent Oxidation Characteristics**: Ideal oxide formation for strong glass adhesion - **Proven Reliability**: Extensive history in high-reliability sealing applications - **Superior Fabricability**: Easy to form, machine, and process - **Industry Compliance**: Meets all major international standards for quality **Technical Note**: Nickel 211 requires specific heat treatment in hydrogen or vacuum atmosphere to achieve optimal surface conditions for glass sealing. The recommended annealing temperature range is 900-1000°C (1650-1830°F) with rapid cooling to prevent excessive oxidation. For best sealing results, proper surface preparation and oxidation control are essential. The alloy's manganese content promotes the formation of a tenacious oxide layer that provides excellent bonding with various glass types. Storage in clean, dry conditions is recommended to prevent surface contamination that could affect sealing performance. The material exhibits excellent deep drawing and forming characteristics in annealed condition.

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 3164 gallon liquid totes Special package is available on request.