Alloy 48,Nilo 48 Fittings,UNS K94800,E FORU

British Specs:，American Specs: ASTM F30，German Specs:

### **Alloy 48 (Nilo 48) - Fittings Product Overview** **Alloy 48**, commercially known as **Nilo 48**, is a controlled expansion iron-nickel alloy specifically engineered for matched sealing with hard glasses such as borosilicate and alumina-silicate types. The **Fittings** form encompasses precision-manufactured components designed for connecting, terminating, or transitioning glass-to-metal seals in various high-reliability systems where thermal expansion compatibility is paramount. * **UNS Designation:** **K94800** * **Product Type:** Precision Fittings, Connectors, Adapters, Assemblies --- #### **1. Chemical Composition** Precisely controlled chemistry ensures consistent thermal performance in finished fittings. | Element | Percentage (%) | Role in the Alloy | |:---|:---|:---| | **Nickel (Ni)** | 47.5 - 48.5 | Controls CTE characteristics and Curie point | | **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 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 hard glass sealing. | Property | Value / Condition | Notes | |:---|:---|:---| | **Density** | 8.22 g/cm³ (0.297 lb/in³) | | | **Melting Point** | ~1430 °C (2605 °F) | | | **Thermal Expansion Coefficient** | 20-300°C: 8.5-9.2 μm/m·°C
20-400°C: 9.0-9.7 μm/m·°C | Matches borosilicate glass expansion | | **Curie Temperature** | ~480 °C (895 °F) | Critical for CTE matching | | **Thermal Conductivity** | 15.2 W/m·K at 20°C | | | **Electrical Resistivity** | 0.48 μΩ·m at 20°C | | | **Specific Heat** | 0.46 J/g·°C at 20°C | | --- #### **3. Mechanical Properties** Typical properties for fittings in annealed condition. * **Tensile Strength:** 520-590 MPa (75-86 ksi) * **Yield Strength (0.2% Offset):** 280-350 MPa (41-51 ksi) * **Elongation:** 25-35% in 2 inches * **Hardness:** 68-83 HRB * **Modulus of Elasticity:** 154 GPa (22.3 × 10⁶ psi) * **Impact Strength:** 45-65 J (Charpy V-notch) --- #### **4. Product Specifications & Applications** **Fittings Types and Configurations:** * **Connector Fittings:** - Hermetic connectors - Multi-pin feedthroughs - Coaxial connectors - High-voltage feedthroughs * **Adapter Fittings:** - Glass-to-metal transitions - Size reducers/enlargers - Flange adapters - Angle connectors * **Specialty Fittings:** - Custom-shaped components - Complex geometric assemblies - Integrated sensor housings - Vacuum port fittings **Primary Applications:** **Electronics & Vacuum Applications:** * **Vacuum System Components:** Feedthrough adapters, flange connectors, and port fittings * **Electronic Package Headers:** Multi-pin connectors and terminal bases * **Microwave Tube Components:** Waveguide adapters and connector interfaces * **Semiconductor Equipment:** Process chamber fittings and gas distribution components **Industrial & Scientific Applications:** * **Optical System Adapters:** Lens mounts, window frames, and optical port connectors * **Laboratory Apparatus:** Specialized glass-to-metal transition fittings * **Sensor Housings:** Protection fittings for temperature and pressure sensors * **Analytical Instrumentation:** Components for spectrometers and analyzers **Aerospace & Defense:** * **Avionics Packaging:** Hermetic connectors and adapters for aircraft systems * **Satellite Components:** Space-qualified feedthroughs and connector systems * **Military Electronics:** Radar system components and communication equipment * **Weapon Systems:** Guidance system packaging and sensor interfaces **Medical & Healthcare:** * **Medical Device Connectors:** Implantable device headers and diagnostic equipment * **Imaging System Components:** X-ray tube connectors and MRI components * **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** | **K94800** | Unified Numbering System Designation | | **AMS** | AMS 7722 | 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 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:** High-volume manufacturing capacity * **Quality Certification:** ISO 9001, AS9100, and NADCAP compliance --- #### **7. Design Considerations** **Critical Design Parameters:** * **Wall Thickness:** Optimized for mechanical strength and thermal performance * **Sealing Surfaces:** Precision-machined for optimal glass adhesion * **Thermal Management:** Designed to minimize thermal stress * **Interface Compatibility:** Engineered for seamless system integration **Application-Specific Configurations:** * **High-Vacuum Fittings:** Optimized for ultra-high 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 48 (Nilo 48) Fittings (UNS K94800)** provide engineered solutions for complex glass-to-metal sealing applications requiring precise mechanical interfaces and reliable performance. Their controlled thermal expansion properties, combined with excellent manufacturability and consistent quality, make them essential for critical systems in aerospace, medical devices, semiconductor equipment, and scientific instrumentation. The fittings form enables the creation of sophisticated hermetic assemblies where glass 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 the most demanding applications where hermetic integrity, thermal cycle performance, and long-term reliability 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 2503 gallon liquid totes Special package is available on request.