Nickel 270,Nickel, Ni, UNS N02270; ASTM F1, F2, F3, F239，1

### **Product Introduction: Nickel 270 (UNS N02270)** **Nickel 270** is the ultimate commercially pure wrought nickel, representing the highest grade of purity available with a typical nickel content of **99.98%**. This exceptional purity gives it the highest thermal and electrical conductivity of all nickel alloys, superior ductility, and excellent corrosion resistance. It is the material of choice for the most critical applications in electronics, aerospace, and scientific research where ultra-purity and maximum performance are non-negotiable. Often referred to as "four nines" nickel, it is supplied in a fully soft, annealed condition to maximize its workability. --- ### **International Standards & Material Equivalences** Nickel 270 is defined primarily by its UNS number and several key ASTM standards that specify its use in electronic components. | Standard Type | Standard Number | Title / Purpose | | :--- | :--- | :--- | | **UNS (Unified Numbering System)** | **N02270** | **Nickel 270** | | **ASTM** | **ASTM F239** | Standard Specification for Pure Nickel Strip for Electron Tube Use | | **MIL Standard (Historical)** | **MIL-N-47173** | Nickel, Wrought, High Purity (Replaced by ASTM and others) | | **Other Designations** | - | Often simply called "High Purity Nickel" or "99.98% Ni" | > **Note on ASTM F1, F2, F3:** While the user listed these, **ASTM F1, F2, and F3 are specific grades of Oxygen-Free Copper (C10100, C10200, C10300)**, not nickel. They are not applicable to Nickel 270. The correct and primary ASTM standard for Nickel 270 in electronic forms is **ASTM F239**. --- ### **Chemical Composition** The defining feature of Nickel 270 is its ultra-high purity, with stringent limits on all other elements. | Element | Content (%) (Typical) | | :--- | :--- | | **Nickel (Ni)** | 99.98% min. | | **Cobalt (Co)** | 0.005 max. | | **Copper (Cu)** | 0.001 max. | | **Iron (Fe)** | 0.005 max. | | **Manganese (Mn)** | 0.001 max. | | **Carbon (C)** | 0.005 max. | | **Silicon (Si)** | 0.001 max. | | **Sulfur (S)** | 0.001 max. | | **Magnesium (Mg)** | 0.001 max. | | **Oxygen (O)** | 0.005 max. | --- ### **Physical Properties** Nickel 270's high purity gives it a distinct and superior set of physical properties compared to other pure nickels like Nickel 200/201. | Property | Value | | :--- | :--- | | **Density** | 8.90 g/cm³ (0.321 lb/in³) | | **Melting Point** | 1455 °C (2651 °F) | | **Thermal Conductivity** | 110 W/m·K (at 20°C) | | **Electrical Resistivity** | **0.062 μΩ·m** (at 20°C) - *Significantly lower than other Ni alloys* | | **Thermal Expansion Coefficient** | 13.3 μm/m·°C (20-100°C) | | **Modulus of Elasticity** | 200 GPa (29 x 10⁶ psi) | | **Magnetic Permeability** | Low, but ferromagnetic at room temperature | | **Curie Temperature** | **353 °C (667 °F)** | --- ### **Mechanical Properties (Typical for Annealed Condition)** Supplied in a dead-soft annealed state, it possesses very low strength and exceptionally high ductility. | Property | Value (Annealed) | | :--- | :--- | | **Tensile Strength** | 345 - 380 MPa (50 - 55 ksi) | | **Yield Strength (0.2% Offset)** | 70 - 110 MPa (10 - 16 ksi) | | **Elongation** | **50% min.** | | **Hardness (Rockwell B)** | 45 - 65 HRB | | **Hardness (Vickers HV)** | ~60 HV | --- ### **Key Characteristics & Advantages** 1. **Ultra-High Purity (99.98% Ni):** The highest commercially available purity, minimizing the impact of impurities on electrical, thermal, and corrosion performance. 2. **Highest Electrical Conductivity:** Its resistivity is approximately **35% lower** than that of Nickel 200, making it the best electrical conductor among nickel alloys. 3. **Superior Ductility and Formability:** Its soft, annealed state allows for extreme cold working, deep drawing, and intricate forming without failure. 4. **Well-Defined Magnetic Properties:** It has a sharp and consistent **Curie point at 353°C**, a critical property for thermomagnetic devices and temperature-sensitive applications. 5. **Excellent Corrosion Resistance:** Outstanding resistance to caustic alkalies, neutral and alkaline salt solutions, and fresh water. --- ### **Product Applications** Nickel 270 is specified for the most demanding applications where the superior properties of ultra-pure nickel are essential. * **Electronics and Vacuum Technology:** * **Electron Tubes & Traveling Wave Tubes:** Anodes, grids, cathodes, and support structures (as per **ASTM F239**). * **Thyratrons and Magnetrons:** Critical internal components requiring high purity and consistent magnetic properties. * **Integrated Circuit (IC) Lead Frames:** For high-reliability packages. * **Battery and Fuel Cell Components.** * **Aerospace & Defense:** * **Waveguides** and other RF components. * **Cruciforms** and other structural components in satellite systems. * **Scientific and Research Equipment:** * **Thermomagnetic Switches and Compensators:** Leveraging its precise and sharp Curie point. * **Particle Accelerator Components.** * **Crucibles** for high-purity crystal growth (e.g., semiconductors). * **Chemical Processing:** * Equipment for handling ultra-pure chemicals or processes where even trace contamination from standard nickel alloys is unacceptable. --- ### **Comparison with Other Pure Nickels** * **vs. Nickel 200/201 (UNS N02200/N02201):** Nickel 270 has significantly higher purity, resulting in measurably better electrical/thermal conductivity and more consistent magnetic properties. * **vs. Nickel 222 (Werkstoff 2.4053):** While both are high-purity nickels for electronics, Nickel 270 is the premium grade with even stricter impurity controls, particularly for cobalt and iron, and superior conductivity. ### **Summary** **Nickel 270 (UNS N02270)** is the pinnacle of commercially pure nickel. Its ultra-high **99.98%** purity defines its exceptional electrical and thermal conductivity, superior formability, and consistent magnetic behavior. Governed by standards like **ASTM F239**, it is an indispensable material for critical components in the electronics, aerospace, and scientific research industries, where performance cannot be compromised.

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 3290 gallon liquid totes Special package is available on request.