Alloy 475,Nilo 475 Rod,UNS K95000,E FORU

British Specs:，American Specs:AMS 7718 Bar, Tube and Forgings MIL-N-14411 Comp 3，German Specs:

### **Alloy 475 (Nilo 475) - Rod Product Overview** **Alloy 475**, commercially known as **Nilo 475**, is a nickel-iron-cobalt controlled expansion alloy specifically engineered for matched sealing with special hard glasses and certain ceramic materials. The **Rod** form provides solid, cylindrical stock material for machining precision components that require unique thermal expansion compatibility in high-reliability applications. * **UNS Designation:** **K95000** * **Common Names:** Nilo 475 Rod, Glass Sealing 475 Rod --- #### **1. Chemical Composition** Precisely controlled chemistry ensures consistent thermal expansion properties in rod form. | Element | Percentage (%) | Role in the Alloy | |:---|:---|:---| | **Nickel (Ni)** | 46.0 - 48.0 | Controls CTE characteristics | | **Cobalt (Co)** | 24.0 - 26.0 | Modifies thermal expansion and Curie point | | **Iron (Fe)** | Balance | Base structural element | | **Manganese (Mn)** | 0.10 - 0.30 | Enhances hot workability during rod production | | **Silicon (Si)** | 0.10 - 0.30 | Improves glass wetting characteristics | | **Carbon (C)** | 0.05 max | Limited to prevent embrittlement | | **Sulfur (S)** | 0.02 max | Controlled impurity | | **Phosphorus (P)** | 0.02 max | Controlled impurity | --- #### **2. Physical Properties** Specialized properties optimized for rod applications and special glass/ceramic sealing. | Property | Value / Condition | Notes | |:---|:---|:---| | **Density** | 8.35 g/cm³ (0.302 lb/in³) | Higher due to cobalt content | | **Melting Point** | ~1445 °C (2635 °F) | | | **Rod Diameter Range** | 3.0 mm to 150 mm | Standard sizes available | | **Thermal Expansion Coefficient** | 20-300°C: 7.8-8.5 μm/m·°C
20-400°C: 8.2-9.0 μm/m·°C | Matches special glass/ceramic expansion | | **Curie Temperature** | ~420 °C (790 °F) | Modified by cobalt addition | | **Thermal Conductivity** | 14.5 W/m·K at 20°C | | | **Electrical Resistivity** | 0.52 μΩ·m at 20°C | | --- #### **3. Mechanical Properties** Typical properties for rod in annealed condition. | Diameter Range (mm) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB) | |:---|:---|:---|:---|:---| | 3.0-12.0 | 540-610 | 300-370 | 25-35 | 75-90 | | 12.0-25.0 | 540-610 | 300-370 | 25-35 | 75-90 | | 25.0-50.0 | 530-600 | 290-360 | 25-35 | 73-88 | | 50.0-150.0 | 520-590 | 280-350 | 20-30 | 73-88 | --- #### **4. Product Specifications & Applications** **Rod Specifications:** * **Diameter Tolerances:** ±0.1 mm for diameters <25 mm, ±0.2% for diameters >25 mm * **Straightness:** ≤1 mm per meter length * **Surface Finish:** 3.2 μm Ra (125 μin) standard, 1.6 μm Ra (63 μin) available * **Length:** Standard 3-4 meters, custom lengths available * **Condition:** Annealed, descaled, and polished **Primary Applications:** * **Special Glass Sealing Components:** Electrodes and support pins for unique glass compositions * **Ceramic-to-Metal Seals:** Precision components for ceramic sealing applications * **Hermetic Feedthroughs:** Specialized connectors for high-reliability systems * **Optical Component Mounts:** Lens holders and positioning rods in scientific instruments * **Vacuum System Components:** Machined flanges and connectors for specialized applications * **Power Tube Components:** Special electrode supports in high-power electronic tubes * **Medical Device Components:** Precision parts for specialized medical equipment * **Aerospace Electronics:** Critical components requiring unique CTE matching --- #### **5. International Standards** Comprehensive standardization for rod products. | Standard Type | Standard Number | Title / Specification | |:---|:---|:---| | **ASTM** | **ASTM F15** | Standard Specification for Iron-Nickel Sealing Alloys | | **UNS** | **K95000** | Unified Numbering System Designation | | **AMS** | AMS 7724 | Aerospace Material Specification for Rod and Bar | | **ASTM** | ASTM B48 | Standard Specification for Rod and Bar | | **DIN** | DIN 1745 | Metallic Materials for Glass-to-Metal Seals | | **ISO** | ISO 9711 | Metallic Materials for Glass-to-Metal Seals | --- #### **6. Machining & Processing Characteristics** **Machinability:** * **Machinability Rating:** 35% (compared to free-cutting brass at 100%) * **Recommended Tools:** High-speed steel or carbide with positive rake angles * **Cutting Speed:** 25-40 m/min for turning operations * **Feed Rate:** 0.1-0.3 mm/rev * **Coolant:** Recommended for optimal surface finish **Heat Treatment:** * **Annealing Temperature:** 850-900°C in protective atmosphere * **Stress Relief:** 650-750°C after heavy machining * **Cooling Rate:** Controlled cooling for optimal microstructure **Surface Preparation:** * **Glass Sealing Surface:** Requires clean, oxide-free surface * **Plating Options:** Copper, nickel, or gold plating available * **Pre-oxidation:** Controlled oxidation for immediate glass sealing --- #### **7. Quality Assurance** * **Chemical Analysis:** Heat certification to specified composition * **Dimensional Verification:** 100% diameter and straightness checking * **Surface Inspection:** Visual and dimensional surface quality assessment * **Mechanical Testing:** Tensile and hardness testing per ASTM standards * **Metallurgical Quality:** Grain size control (ASTM 5-7 typical) --- **Summary** **Alloy 475 (Nilo 475) Rod (UNS K95000)** provides a robust, machinable form of this specialized sealing alloy with unique thermal expansion characteristics due to its cobalt content. Its precisely controlled thermal expansion properties, combined with excellent mechanical properties and consistent dimensional quality, make it ideal for manufacturing precision components in aerospace, medical, scientific instrumentation, and specialized industrial applications requiring matching with special glasses or ceramics. The rod's ability to be machined into complex components while maintaining perfect thermal expansion matching ensures reliable performance in the most demanding sealing applications. Compliance with **ASTM F15** and other international standards guarantees material consistency and performance reliability across all manufacturing processes.

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 2522 gallon liquid totes Special package is available on request.