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

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

### **Alloy 48 (Nilo 48) - Strip 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 **Strip** form provides precision thin, narrow material with exact dimensional control for high-volume manufacturing of components requiring reliable thermal expansion compatibility with hard glass. * **UNS Designation:** **K94800** * **Common Names:** Nilo 48 Strip, Glass Sealing 48 Strip --- #### **1. Chemical Composition** Precisely controlled chemistry ensures consistent thermal expansion properties in strip form. | 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 strip rolling characteristics | | **Silicon (Si)** | 0.10 - 0.30 | Improves glass wetting performance | | **Carbon (C)** | 0.05 max | Limited for optimal stamping performance | | **Sulfur (S)** | 0.02 max | Controlled impurity | | **Phosphorus (P)** | 0.02 max | Controlled impurity | --- #### **2. Physical Properties** Specialized properties optimized for strip 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. | Property | Annealed | Quarter Hard | Half Hard | Full Hard | |:---|:---|:---|:---|:---| | **Tensile Strength (MPa)** | 500-580 | 600-700 | 700-800 | 800-950 | | **Yield Strength (MPa)** | 260-330 | 500-600 | 600-720 | 720-880 | | **Elongation (%)** | 30-40 | 15-25 | 10-20 | 5-12 | | **Hardness (HV)** | 130-160 | 170-200 | 200-240 | 240-300 | --- #### **4. Product Specifications & Applications** **Strip Specifications:** * **Thickness Range:** 0.05 mm to 2.0 mm * **Width Range:** 2.0 mm to 300 mm * **Length:** Coils up to 2000 meters * **Thickness Tolerance:** ±3% standard, ±2% available * **Width Tolerance:** ±0.05 mm standard * **Surface Finish:** 0.4 μm Ra standard, 0.2 μm Ra available **Temper Conditions:** * **Annealed (O):** Maximum formability * **Quarter Hard (1/4H):** Good formability with increased strength * **Half Hard (1/2H):** Moderate formability, higher strength * **Full Hard (H):** Maximum strength, spring properties **Primary Applications:** **Electronics & Electrical:** * **Lead Frames:** Precision-stamped frames for semiconductor packages * **Electronic Package Components:** Lids, bases, and shielding elements * **Connector Components:** Precision contacts and spring elements * **Sensor Elements:** Thin-film substrates and sensing components **Industrial & Scientific:** * **Sealing Ribbons:** Narrow seals for vacuum and electronic tubes * **Optical Component Frames:** Precision mounts for optical systems * **Instrumentation Parts:** Small components for scientific instruments * **Medical Device Components:** Precision parts for medical equipment **Automotive & Aerospace:** * **Automotive Sensors:** Components for engine management systems * **Aerospace Electronics:** Critical components for avionics systems * **Satellite Components:** Precision parts for space applications --- #### **5. International Standards** Comprehensive international specifications for strip 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 Strip | | **DIN** | DIN 1745 | Metallic Materials for Glass-to-Metal Seals | | **ISO** | ISO 9711 | Metallic Materials for Glass-to-Metal Seals | | **JIS** | JIS H 4541 | Iron-Nickel Alloy Strip for Glass Sealing | --- #### **6. Manufacturing & Processing** **Stamping & Forming:** * **Blank Size:** Up to 300 mm width in coil form * **Progressive Die Capability:** Excellent for high-speed production * **Minimum Bend Radius:** 1x thickness (annealed), 2x thickness (hard) * **Tooling Clearance:** 5-8% of material thickness recommended **Surface Treatments:** * **Copper Plating:** 0.5-2.0 μm for improved solderability * **Nickel Plating:** For high-temperature applications * **Pre-oxidation:** Controlled surface for immediate glass sealing * **Bright Annealing:** For critical surface applications **Quality Control:** * **Dimensional Control:** Laser measurement for thickness and width * **Surface Inspection:** Automated surface defect detection * **Edge Quality:** Controlled slit edge condition * **Mechanical Testing:** Regular tensile and hardness verification --- #### **7. Special Features** **Precision Attributes:** * **Dimensional Stability:** Excellent for precision component manufacturing * **Surface Quality:** Superior for critical glass sealing applications * **Consistency:** Batch-to-batch consistency for high-volume production * **Formability:** Adaptable to various manufacturing processes **Processing Guidelines:** * **Storage:** Dry, controlled environment recommended * **Handling:** Proper coil handling to prevent edge damage * **Slitting:** Precision slitting to tight width tolerances * **Annealing:** Continuous annealing available for coil products --- **Summary** **Alloy 48 (Nilo 48) Strip (UNS K94800)** represents the highest precision form of this hard glass sealing alloy, offering exceptional dimensional control and consistent performance for mass-produced electronic components. Its carefully engineered thermal expansion properties, combined with excellent stamping characteristics and superior surface quality, make it indispensable for modern electronics manufacturing, particularly in semiconductor packaging, precision connectors, and micro-electronic components. The strip form enables high-volume, cost-effective production of complex components through progressive die stamping and high-speed automation while maintaining perfect thermal expansion matching with hard glasses. Compliance with **ASTM F15** and other international standards ensures material quality and performance consistency for automated high-volume production of reliable glass-to-metal seals in critical electronic 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 2502 gallon liquid totes Special package is available on request.