Alloy 475,Nilo 475,UNS K95000,E FORU

### **Alloy 475 / Nilo 475 / UNS K95000** **Iron-Nickel-Cobalt Controlled Expansion Alloy for Precision Instrumentation** --- #### **1. Overview** **Nilo 475**, commercially designated as **Alloy 475**, is an iron-nickel-cobalt controlled expansion alloy specifically engineered to provide an optimal balance of thermal expansion characteristics, mechanical properties, and thermal stability. This alloy is designed for applications requiring precise dimensional control under varying temperature conditions, particularly in precision instrumentation and electronic packaging. The strategic addition of cobalt enhances the alloy's performance at elevated temperatures while maintaining excellent thermal expansion control. --- #### **2. Chemical Composition (Weight %)** The typical chemical composition of Alloy 475 is outlined below. The balance is Iron (Fe). | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Iron (Fe)** | Balance | Forms the primary matrix of the alloy system. | | **Nickel (Ni)** | 40.0 - 42.0 | Primary element controlling thermal expansion characteristics. | | **Cobalt (Co)** | 5.0 - 6.0 | Enhances high-temperature stability and modifies thermal expansion properties. | | **Manganese (Mn)** | 0.30 - 0.60 | Improves hot workability and acts as a deoxidizer during processing. | | **Silicon (Si)** | 0.15 - 0.25 | Enhances oxidation resistance and improves surface characteristics. | | **Carbon (C)** | 0.03 max | Minimized to ensure dimensional stability and prevent aging effects. | | **Chromium (Cr)** | 0.15 max | Controlled impurity element. | | **Copper (Cu)** | 0.15 max | Controlled impurity element. | | **Aluminum (Al)** | 0.05 max | Carefully regulated to ensure consistent material properties. | | **Titanium (Ti)** | 0.05 max | Controlled trace element. | | **Sulfur (S)** | 0.010 max | Minimized to prevent hot shortness during fabrication. | | **Phosphorus (P)** | 0.010 max | Controlled to maintain ductility and workability. | --- #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.15 g/cm³ (0.294 lb/in³) | | **Melting Point** | ~ 1425 °C (2597 °F) | | **Mean Coefficient of Thermal Expansion** | 20 - 200°C (68 - 392°F): **5.8 x 10⁻⁶/°C** (3.2 x 10⁻⁶/°F)
20 - 300°C (68 - 572°F): **6.5 x 10⁻⁶/°C** (3.6 x 10⁻⁶/°F)
20 - 400°C (68 - 752°F): **7.3 x 10⁻⁶/°C** (4.1 x 10⁻⁶/°F) | | **Thermal Conductivity** | 14.8 W/m·K (102 Btu·in/hr·ft²·°F) at 20°C (68°F) | | **Specific Heat Capacity** | 512 J/kg·K (0.122 Btu/lb·°F) at 20°C (68°F) | | **Electrical Resistivity** | 0.72 μΩ·m at 20°C (68°F) | | **Modulus of Elasticity (Young's Modulus)** | 147 GPa (21.3 x 10⁶ psi) at 20°C (68°F) | | **Curie Temperature** | ~ 380 °C (716 °F) | | **Magnetic Properties** | Ferromagnetic below Curie temperature | --- #### **4. Mechanical Properties (Typical for Annealed Condition)** | Property | Value at Room Temperature | | :--- | :--- | | **Tensile Strength** | 530 MPa (77 ksi) | | **Yield Strength (0.2% Offset)** | 360 MPa (52 ksi) | | **Elongation (in 50 mm / 2 in)** | 28% | | **Reduction of Area** | 63% | | **Hardness (Rockwell B)** | 79 HRB | | **Vickers Hardness** | 162 HV | --- #### **5. International Standards** Alloy 475 conforms to the following international specifications: * **ASTM:** * **F1684:** Standard Specification for Iron-Nickel and Iron-Nickel-Cobalt Alloys for Low Thermal Expansion Applications * **AMS:** * **AMS 7726:** Sheet, Strip, and Plate * **UNS:** K95000 * **ISO:** * **ISO 19960:** Iron-nickel low expansion alloys * **JIS:** * **JIS C 2531:** Iron-nickel alloy for sealing use * **EN:** * **EN 10140:** Cold rolled narrow steel strip --- #### **6. Product Applications** Alloy 475 serves critical functions in precision applications requiring controlled thermal expansion: * **Precision Instrumentation:** * Optical measurement equipment frames * Laboratory instrument structures * Metrology system components * Calibration device mounts * **Aerospace Systems:** * Avionics packaging components * Guidance system housings * Satellite instrument mounts * Navigation equipment frames * **Electronic Packaging:** * Hybrid circuit substrates * Precision electronic enclosures * Sensor packaging components * RF and microwave housings * **Telecommunications:** * Base station components * Fiber optic alignment systems * Communication equipment frames * Network infrastructure hardware * **Medical Equipment:** * Diagnostic instrument frames * Medical imaging components * Surgical device structures * Laboratory analyzer mounts --- #### **7. Key Characteristics & Advantages** * **Optimized Thermal Expansion:** CTE of 5.8-7.3 x 10⁻⁶/°C provides excellent matching for various technical applications * **Enhanced Thermal Stability:** Cobalt addition improves performance at elevated temperatures * **Excellent Mechanical Properties:** Balanced strength and ductility for precision applications * **Good Dimensional Stability:** Maintains precise dimensions under thermal cycling * **Superior Fabricability:** Excellent formability and machinability characteristics * **Consistent Performance:** Reliable and repeatable material properties * **Good Corrosion Resistance:** Suitable for various environmental conditions * **Proven Reliability:** Successful implementation in demanding precision applications --- **Disclaimer:** *Nilo® is a registered trademark. The values provided are typical and for informational purposes only. For critical applications, always consult the official material data sheets from the supplier and relevant design codes. Proper heat treatment may be required to achieve optimal dimensional stability for specific 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 1691 gallon liquid totes Special package is available on request.