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

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

### **Alloy 48 (Nilo 48) - Forgings 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 **Forgings** form provides superior mechanical properties and structural integrity for critical components requiring high reliability in demanding applications where thermal expansion matching with hard glass is essential. * **UNS Designation:** **K94800** * **Product Type:** Die Forgings, Open-Die Forgings, Precision Forgings --- #### **1. Chemical Composition** Precisely controlled chemistry ensures consistent thermal and mechanical properties in forged components. | Element | Percentage (%) | Role in the Alloy | |:---|:---|:---| | **Nickel (Ni)** | 47.5 - 48.5 | Controls thermal expansion coefficient and Curie point | | **Iron (Fe)** | Balance | Base element providing structural matrix | | **Manganese (Mn)** | 0.10 - 0.30 | Enhances forgeability and acts as deoxidizer | | **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** Forged components maintain consistent physical properties critical for glass sealing applications. | 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** Forgings provide enhanced mechanical properties compared to wrought forms. **Typical Properties in Heat Treated Condition:** * **Tensile Strength:** 550-620 MPa (80-90 ksi) * **Yield Strength (0.2% Offset):** 300-380 MPa (44-55 ksi) * **Elongation:** 25-35% in 2 inches * **Reduction of Area:** 45-60% * **Impact Strength:** 45-65 J (33-48 ft-lb) [Charpy V-notch] * **Hardness:** 70-85 HRB * **Fatigue Strength:** 280 MPa (41 ksi) at 10⁸ cycles --- #### **4. Product Specifications & Applications** **Forging Types and Capabilities:** * **Closed-Die Forgings:** - Complex, near-net shapes - High dimensional accuracy - Minimal machining required - Weight range: 0.5 kg to 50 kg * **Open-Die Forgings:** - Larger, simpler forms - Custom shapes and sizes - Weight range: 50 kg to 500 kg - Enhanced grain structure * **Precision Forgings:** - Tight dimensional tolerances - Superior surface finish - Minimal secondary operations - High-volume production capability **Primary Applications:** **Aerospace & Defense:** * **Engine Components:** Mounting brackets and support structures * **Structural Members:** Airframe components requiring glass seals * **Missile System Parts:** Guidance system housings and components * **Radar System Components:** Waveguide supports and structural elements **Power Electronics & Industrial:** * **Power Tube Components:** Large transmitter tube housings and supports * **Vacuum System Flanges:** Large diameter sealing flanges * **Semiconductor Equipment:** Chamber components and process modules * **High-Temperature Fixtures:** Furnace components and processing fixtures **Scientific & Medical:** * **Research Equipment:** Particle accelerator components * **Medical Imaging:** MRI and CT scanner components * **Analytical Instruments:** Mass spectrometer housings * **Nuclear Applications:** Radiation detector housings --- #### **5. International Standards** Comprehensive international specifications for forged 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 Forgings | | **DIN** | DIN 1745 | Metallic Materials for Glass-to-Metal Seals | | **ISO** | ISO 9711 | Metallic Materials for Glass-to-Metal Seals | --- #### **6. Manufacturing & Quality Assurance** **Forging Process:** * **Forging Temperature:** 1100-1250°C (2010-2280°F) * **Grain Flow Optimization:** Controlled deformation for optimal properties * **Heat Treatment:** Solution annealing and stress relief cycles * **Surface Preparation:** Machining to final dimensions **Quality Control:** * **Ultrasonic Testing:** Per ASTM A388 for internal quality * **Dye Penetrant Inspection:** Per ASTM E165 for surface defects * **Metallurgical Examination:** Grain size assessment per ASTM E112 * **Mechanical Testing:** Tensile and impact testing per heat treat lot **Special Capabilities:** * **Complex Geometry:** Ability to produce intricate shapes * **Size Range:** From small precision parts to large structural components * **Material Utilization:** Optimized for minimum waste * **Repeatability:** Consistent quality across production runs --- #### **7. Design Advantages** **Technical Benefits:** * **Superior Strength:** Enhanced mechanical properties over castings * **Grain Structure:** Optimized grain flow for improved fatigue resistance * **Reliability:** Proven performance in critical applications * **Cost Effectiveness:** Reduced machining and material waste **Application-Specific Solutions:** * **Custom Designs:** Tailored to specific application requirements * **Prototype Development:** Rapid prototyping capabilities * **Volume Production:** Scalable manufacturing processes * **Technical Support:** Engineering expertise for optimal design --- **Summary** **Alloy 48 (Nilo 48) Forgings (UNS K94800)** provide the highest level of structural integrity and reliability for critical hard glass-to-metal sealing applications. The forging process enhances mechanical properties, improves grain structure, and ensures material soundness for components subjected to high stresses and demanding service conditions. The superior fatigue strength, impact resistance, and thermal stability make forged Alloy 48 components the preferred choice for aerospace, defense, power generation, and scientific applications where failure is not an option. Compliance with **ASTM F15** and other international standards guarantees consistent performance in the most challenging sealing applications, ensuring long-term reliability and operational safety.

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 2504 gallon liquid totes Special package is available on request.