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

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

### **Alloy 48 (Nilo 48) - Sheet Product Overview** **Alloy 48**, commercially known as **Nilo 48**, is a controlled expansion iron-nickel alloy specifically designed for matched sealing with hard glasses such as borosilicate and alumina-silicate types. The **Sheet** form provides thin, flat material for applications requiring precise thermal expansion compatibility with hard glass while offering excellent formability and consistent mechanical properties. * **UNS Designation:** **K94800** * **Common Names:** Nilo 48 Sheet, Glass Sealing 48 Sheet --- #### **1. Chemical Composition** Precisely controlled chemistry ensures consistent thermal performance in sheet form. | Element | Percentage (%) | Role in the Alloy | |:---|:---|:---| | **Nickel (Ni)** | 47.5 - 48.5 | Primary element controlling CTE characteristics | | **Iron (Fe)** | Balance | Base structural element | | **Manganese (Mn)** | 0.10 - 0.30 | Enhances rolling and forming characteristics | | **Silicon (Si)** | 0.10 - 0.30 | Improves glass wetting performance | | **Carbon (C)** | 0.05 max | Limited for optimal formability | | **Sulfur (S)** | 0.02 max | Controlled impurity | | **Phosphorus (P)** | 0.02 max | Controlled impurity | --- #### **2. Physical Properties** Optimized properties for sheet 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** Properties vary with thickness and temper condition. | Thickness (mm) | Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | |:---|:---|:---|:---|:---| | 0.1-0.5 | Annealed | 500-570 | 260-330 | 25-35 | | 0.5-1.0 | Annealed | 510-580 | 270-340 | 30-40 | | 1.0-3.0 | Annealed | 510-580 | 270-340 | 30-40 | | 3.0-6.0 | Annealed | 520-590 | 280-350 | 30-40 | --- #### **4. Product Specifications & Applications** **Sheet Specifications:** * **Thickness Range:** 0.1 mm to 6.0 mm * **Width Range:** 100 mm to 600 mm * **Length:** Standard coils or cut lengths * **Thickness Tolerance:** ±5% standard, ±3% available * **Surface Finish:** 0.8 μm Ra standard, 0.4 μm Ra available **Temper Conditions:** * **Annealed:** Maximum formability for deep drawing * **Quarter Hard:** Balanced formability and strength * **Half Hard:** Increased strength with moderate formability * **Full Hard:** Maximum strength, limited formability **Primary Applications:** **Electronics & Electrical:** * **Electronic Package Lids:** Hermetic seals for microelectronic packages * **RF/Microwave Housings:** Enclosures for high-frequency components * **Power Device Bases:** Mounting surfaces for power electronics * **Sensor Diaphragms:** Thin sensing elements with glass seals **Industrial & Scientific:** * **Optical Component Mounts:** Precision frames for optical systems * **Laboratory Equipment:** Specialized apparatus requiring glass seals * **Instrument Panels:** Control surfaces with integrated glass viewports * **Vacuum System Components:** Sealing flanges and cover plates **Aerospace & Defense:** * **Avionics Housings:** Electronic enclosures for aircraft systems * **Satellite Components:** Space-qualified electronic packages * **Military Electronics:** Ruggedized enclosures for defense applications --- #### **5. International Standards** Comprehensive international specifications for sheet 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 | | **ASTM** | ASTM B48 | Standard Specification for Nickel Alloy Sheet | | **DIN** | DIN 1745 | Metallic Materials for Glass-to-Metal Seals | | **ISO** | ISO 9711 | Metallic Materials for Glass-to-Metal Seals | --- #### **6. Manufacturing & Processing** **Forming Characteristics:** * **Deep Drawing:** Excellent in annealed condition * **Stamping:** Suitable for high-speed production * **Bending:** Minimum bend radius 1x thickness (annealed) * **Blank Size:** Practical limits based on thickness and equipment **Heat Treatment:** * **Annealing:** 850-900°C in protective atmosphere * **Stress Relieving:** 650-750°C after forming operations * **Continuous Annealing:** Available for coil products **Surface Preparation:** * **Cleaning:** Essential for optimal glass sealing * **Plating Options:** Copper, nickel, or specialty coatings * **Pre-oxidation:** Controlled surface treatment for glass sealing * **Surface Finish:** Critical for consistent glass adherence --- #### **7. Quality Assurance** * **Dimensional Control:** Thickness, width, and flatness verification * **Surface Inspection:** Visual and automated surface quality assessment * **Mechanical Testing:** Tensile and hardness testing per lot * **Flatness Standards:** ≤3 mm per meter for most applications * **Certification:** Full material traceability with test reports --- **Summary** **Alloy 48 (Nilo 48) Sheet (UNS K94800)** provides a versatile thin-gauge material solution for applications requiring reliable hard glass-to-metal seals. Its precisely matched thermal expansion properties with borosilicate and other hard glasses, combined with excellent formability and consistent quality, make it ideal for electronic packaging, aerospace components, scientific instruments, and industrial equipment. The sheet form enables cost-effective manufacturing of complex components through stamping, drawing, and forming processes while maintaining critical thermal expansion matching. Compliance with **ASTM F15** and other international standards ensures material consistency and performance reliability for demanding applications where hermetic integrity and thermal cycle performance are essential.

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 2501 gallon liquid totes Special package is available on request.