Alloy 205，Nickel 205 ，UNS N02205，EFORU

British Specs:，American Specs:AMS 5555 Wire and Ribbon MIL-N-46025，German Specs:

### **Technical Datasheet: Nickel 205 (Alloy 205 / UNS N02205)** #### **1. Introduction** **Nickel 205** (commercially known as **Alloy 205**, and standardized as **UNS N02205**) is a commercially pure nickel alloy with controlled magnesium addition (typically 0.01-0.10%). This alloy maintains the excellent corrosion resistance and physical properties of pure nickel while offering improved oxidation resistance and elevated temperature strength compared to Nickel 200 and 201. The addition of magnesium enhances the material's resistance to high-temperature oxidation and improves its creep resistance, making Nickel 205 suitable for applications requiring long-term stability at elevated temperatures. It retains good electrical and thermal conductivity while providing enhanced performance in oxidizing atmospheres. #### **2. Chemical Composition (% Weight)** | Element | Content (%) | Content (%) (Typical) | | :--- | :--- | :--- | | **Nickel (Ni)** | 99.0 min | ≥ 99.0 | | **Magnesium (Mg)** | 0.01 - 0.10 | 0.03 - 0.06 | | **Carbon (C)** | 0.15 max | 0.08 | | **Manganese (Mn)** | 0.35 max | 0.20 | | **Iron (Fe)** | 0.40 max | 0.20 | | **Copper (Cu)** | 0.25 max | 0.15 | | **Silicon (Si)** | 0.35 max | 0.15 | | **Sulfur (S)** | 0.01 max | 0.005 | #### **3. Physical Properties** | Property | Metric Unit | Imperial Unit | | :--- | :--- | :--- | | **Density** | 8.89 g/cm³ | 0.321 lb/in³ | | **Melting Point** | 1435-1445 °C | 2615-2633 °F | | **Thermal Conductivity** (at 25°C) | 69 W/m·K | 478 BTU·in/hr·ft²·°F | | **Electrical Resistivity** | 0.096 µΩ·m | 36.8 µΩ·in | | **Modulus of Elasticity** | 186 GPa | 27 x 10⁶ psi | | **Thermal Expansion Coefficient** (20-100°C) | 13.3 µm/m·°C | 7.4 x 10⁻⁶ in/in·°F | | **Curie Temperature** | ~ 360 °C | ~ 680 °F | #### **4. Mechanical Properties (Typical at Room Temperature)** **Annealed Condition:** * **Tensile Strength:** 400 - 520 MPa (58 - 75 ksi) * **Yield Strength (0.2% Offset):** 120 - 240 MPa (17 - 35 ksi) * **Elongation (in 2 inches):** 40 - 50% **Elevated Temperature Properties (at 500°C/932°F):** * **Tensile Strength:** ~ 280 MPa (41 ksi) * **Yield Strength:** ~ 120 MPa (17 ksi) * **Creep Strength:** Improved compared to Nickel 200/201 #### **5. International Standards** Nickel 205 is covered by various international specifications: | Product Form | ASTM Standard | UNS | Other Standards | | :--- | :--- | :--- | :--- | | **Plate, Sheet & Strip** | ASTM B162 | N02205 | - | | **Rod & Bar** | ASTM B160 | N02205 | - | | **Wire** | ASTM B160 | N02205 | - | | **Forgings** | ASTM B564 | N02205 | - | #### **6. Key Characteristics & Advantages** * **Improved Oxidation Resistance:** Magnesium addition enhances resistance to high-temperature oxidation * **Enhanced Creep Resistance:** Better long-term performance at elevated temperatures compared to Nickel 200/201 * **Excellent Corrosion Resistance:** Maintains good resistance to caustic alkalis, reducing acids, and neutral salts * **Good Electrical Conductivity:** Suitable for electrical applications requiring elevated temperature performance * **Magnetic Properties:** Ferromagnetic at room temperature, becoming non-magnetic above Curie temperature * **Good Fabricability:** Can be readily formed, machined, and welded using standard techniques #### **7. Temperature Capability** * **Recommended Maximum Service Temperature:** **650°C (1200°F)** * **Continuous Service:** Up to 650°C (1200°F) with improved oxidation resistance * **Intermittent Service:** Up to 870°C (1600°F) for short durations * **Cryogenic Service:** Down to -196°C (-321°F) #### **8. Product Applications** Nickel 205 is specified for applications requiring improved high-temperature performance: * **Electronics Industry:** * Lead frames for high-temperature applications * Electronic tube components * Electrical contacts requiring oxidation resistance * High-temperature connector components * **Electrical Applications:** * Resistance welding electrodes * Electrical heating elements supports * High-temperature electrical connectors * Power semiconductor components * **Industrial Applications:** * Furnace components * Heat treatment fixtures * Chemical processing equipment for elevated temperature service * Glass-to-metal seals * **Automotive Industry:** * Spark plug electrodes * Sensor components * High-temperature electrical connections * **Other Applications:** * Aerospace components requiring oxidation resistance * High-temperature instrumentation * Nuclear reactor components * Specialized chemical processing equipment --- **Disclaimer:** The information provided herein is for reference purposes only. Material properties can vary based on manufacturing process, heat treatment, and product form. For critical applications, consult the relevant material standards and a qualified materials engineer. Performance at elevated temperatures should be verified for specific service conditions.

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 1650 gallon liquid totes Special package is available on request.