Alloy 475,Nilo 475 Fittings,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) - Fittings 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 **Fittings** form encompasses precision-manufactured components designed for connecting, terminating, or transitioning specialized glass-to-metal or ceramic-to-metal seals in high-reliability systems. * **UNS Designation:** **K95000** * **Product Type:** Precision Fittings, Connectors, Adapters, Specialized Assemblies --- #### **1. Chemical Composition** Precisely controlled chemistry ensures consistent thermal performance in finished fittings. | Element | Percentage (%) | Role in the Alloy | |:---|:---|:---| | **Nickel (Ni)** | 46.0 - 48.0 | Controls CTE characteristics | | **Cobalt (Co)** | 24.0 - 26.0 | Modifies thermal expansion properties | | **Iron (Fe)** | Balance | Base structural element | | **Manganese (Mn)** | 0.10 - 0.30 | Enhances manufacturability of complex shapes | | **Silicon (Si)** | 0.10 - 0.30 | Improves glass/ceramic wetting characteristics | | **Carbon (C)** | 0.05 max | Limited for optimal welding performance | | **Sulfur (S)** | 0.02 max | Controlled impurity | | **Phosphorus (P)** | 0.02 max | Controlled impurity | --- #### **2. Physical Properties** Specialized properties optimized for fittings applications and special material 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) | | | **Thermal Expansion Coefficient** | 20-300°C: 7.8-8.5 μm/m·°C
20-400°C: 8.2-9.0 μm/m·°C | Unique CTE for special applications | | **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 | | | **Specific Heat** | 0.45 J/g·°C at 20°C | | --- #### **3. Mechanical Properties** Typical properties for fittings in annealed condition. * **Tensile Strength:** 540-610 MPa (78-88 ksi) * **Yield Strength (0.2% Offset):** 300-370 MPa (44-54 ksi) * **Elongation:** 20-30% in 2 inches * **Hardness:** 75-90 HRB * **Modulus of Elasticity:** 158 GPa (22.9 × 10⁶ psi) * **Impact Strength:** 45-65 J (Charpy V-notch) --- #### **4. Product Specifications & Applications** **Fittings Types and Configurations:** * **Special Connector Fittings:** - Hermetic connectors for unique glass systems - Multi-pin feedthroughs for specialized applications - Coaxial connectors for advanced RF systems - High-voltage feedthroughs for special requirements * **Adapter Fittings:** - Special glass-to-metal transitions - Ceramic-to-metal adapters - Flange adapters for unique interfaces - Angle connectors for complex configurations * **Specialty Fittings:** - Custom-shaped components for unique applications - Complex geometric assemblies - Integrated sensor housings for special environments - Vacuum port fittings for advanced systems **Primary Applications:** **Electronics & Vacuum Applications:** * **Advanced Vacuum System Components:** Special feedthrough adapters and flange connectors * **Electronic Package Headers:** Multi-pin connectors for unique glass systems * **Microwave Tube Components:** Special waveguide adapters and interfaces * **Semiconductor Equipment:** Advanced process chamber fittings **Industrial & Scientific Applications:** * **Advanced Optical System Adapters:** Special lens mounts and window frames * **Laboratory Apparatus:** Unique glass-to-metal transition fittings * **Sensor Housings:** Protection fittings for specialized sensors * **Analytical Instrumentation:** Components for advanced spectrometers **Aerospace & Defense:** * **Special Avionics Packaging:** Hermetic connectors for unique aircraft systems * **Satellite Components:** Space-qualified feedthroughs with special requirements * **Military Electronics:** Advanced radar system components * **Weapon Systems:** Special guidance system packaging **Medical & Healthcare:** * **Advanced Medical Device Connectors:** Special implantable device headers * **Imaging System Components:** Advanced X-ray tube connectors * **Surgical Instrumentation:** Specialized fittings for medical equipment --- #### **5. International Standards** Comprehensive international specifications for fittings 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 | | **ISO** | ISO 9711 | Metallic Materials for Glass-to-Metal Seals | | **DIN** | DIN 1745 | Metallic Materials for Glass-to-Metal Seals | | **MIL-STD** | MIL-STD-883 | Test Methods for Microelectronics | --- #### **6. Manufacturing & Quality Assurance** **Manufacturing Processes:** * **Precision Machining:** CNC turning, milling, and grinding * **Forming:** Cold and hot forming for complex shapes * **Joining:** TIG welding, laser welding, and specialized brazing * **Surface Treatment:** Plating, polishing, and special coatings **Quality Control Measures:** * **Dimensional Inspection:** CMM verification of critical dimensions * **Leak Testing:** Helium mass spectrometry to 1 × 10⁻⁹ atm·cc/s * **Metallurgical Examination:** Grain structure and integrity assessment * **Performance Testing:** Thermal cycling and mechanical load testing **Special Features:** * **Custom Engineering:** Tailored solutions for specific applications * **Prototype Development:** Rapid prototyping capabilities * **Volume Production:** Manufacturing capacity for production quantities * **Quality Certification:** ISO 9001, AS9100 compliance --- #### **7. Design Considerations** **Critical Design Parameters:** * **Wall Thickness:** Optimized for mechanical strength and thermal performance * **Sealing Surfaces:** Precision-machined for optimal material adhesion * **Thermal Management:** Designed to minimize thermal stress * **Interface Compatibility:** Engineered for seamless system integration **Application-Specific Configurations:** * **High-Vacuum Fittings:** Optimized for specialized vacuum applications * **High-Temperature Fittings:** Designed for elevated temperature service * **High-Pressure Fittings:** Engineered for pressure containment * **Radiation-Hardened Fittings:** Suitable for nuclear applications --- **Summary** **Alloy 475 (Nilo 475) Fittings (UNS K95000)** provide engineered solutions for complex sealing applications requiring precise mechanical interfaces and reliable performance with special glasses and certain ceramics. Their unique thermal expansion properties, enhanced by cobalt content, combined with good manufacturability and consistent quality, make them essential for critical systems in aerospace, medical devices, semiconductor equipment, and advanced scientific instrumentation. The fittings form enables the creation of sophisticated hermetic assemblies where special materials must be seamlessly integrated with metal components in complex geometries. Compliance with **ASTM F15** and other international standards ensures material consistency and performance reliability for demanding applications where hermetic integrity, thermal cycle performance, and unique expansion matching are essential requirements.

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 2529 gallon liquid totes Special package is available on request.