Alloy 42,Nilo 42 ,UNS K94100,E FORU

British Specs:，American Specs: ASTM F30 ASTM B 753 AMS 5683 Welding Wire，German Specs: WS 1.3917,DIN 17745 AFNOR NF A54-301

**Product Datasheet: Alloy 42 / Nilo 42 (UNS K94100)** **Low Expansion Nickel-Iron Alloy** --- ### **1. Overview** Alloy 42 (commercially known as **Nilo 42**) is a **nickel-iron alloy** containing approximately **42% nickel**, engineered to exhibit a **controlled thermal expansion coefficient** that closely matches those of **borosilicate glass, alumina, and certain ceramics**. This characteristic makes it an ideal material for creating reliable **hermetic seals** in electronic, aerospace, and telecommunications components. The alloy is covered under the Unified Numbering System as **UNS K94100**. --- ### **2. Chemical Composition (Weight %)** | Element | Alloy 42 / Nilo 42 (Standard) | UNS K94100 Requirements | |------------------|--------------------------------|---------------------------| | **Nickel (Ni)** | 41.0 – 42.5% | 41.0 – 42.5% | | **Iron (Fe)** | Balance | Balance | | **Manganese (Mn)**| 0.50 – 0.80% | ≤ 0.80% | | **Silicon (Si)** | 0.15 – 0.30% | ≤ 0.30% | | **Carbon (C)** | ≤ 0.05% | ≤ 0.05% | | **Chromium (Cr)**| ≤ 0.15% | ≤ 0.15% | | **Copper (Cu)** | ≤ 0.05% | ≤ 0.05% | | **Aluminum (Al)**| ≤ 0.05% | ≤ 0.05% | | **Sulfur (S)** | ≤ 0.015% | ≤ 0.015% | | **Phosphorus (P)**| ≤ 0.015% | ≤ 0.015% | --- ### **3. Physical & Mechanical Properties** | Property | Typical Value | Condition | |---------------------------------|----------------------------------|-------------------------| | **Coefficient of Thermal Expansion** | 4.5 – 5.5 × 10⁻⁶/°C (20–300°C) | Annealed | | **Density** | 8.11 g/cm³ | – | | **Melting Point** | 1420 – 1450°C | – | | **Tensile Strength** | 520 – 620 MPa | Annealed | | **Yield Strength (0.2% Offset)**| 280 – 380 MPa | Annealed | | **Elongation (in 2")** | 30 – 40% | Annealed | | **Modulus of Elasticity** | 145 GPa | – | | **Hardness (Rockwell B)** | 65 – 80 HRB | Annealed | | **Electrical Resistivity** | 0.75 μΩ·m | at 20°C | | **Thermal Conductivity** | 14.5 W/m·K | at 20°C | | **Curie Temperature** | 360°C | – | --- ### **4. International Standards & Equivalents** | Standard Type | Designation | |-------------------------|-------------------------------| | **UNS** | K94100 | | **ASTM** | F30 (Alloy 42) | | **EN (European)** | Ni42Fe (1.3917) | | **ISO** | NiFe42 | | **JIS** | C42N | | **GB (China)** | 4J42 | | **DIN** | Ni42 | --- ### **5. Product Applications** #### 5.1 Electronics & Semiconductor Packaging - **Lead frames** for ICs and transistors - **Semiconductor packaging** with glass or ceramic seals - **Microelectronic housings** #### 5.2 Glass & Ceramic Sealing - **Hermetic seals** in connectors, sensors, and relays - **RF & microwave components** - **Laser and optical packaging** #### 5.3 Automotive & Aerospace - **Ignition system components** - **Sealed sensors and control units** - **Avionics and communication modules** #### 5.4 Telecommunications & Power - **Reed switches** - **Power transistor bases** - **Waveguide and antenna components** --- ### **6. Available Product Forms** - Strip & Foil - Wire & Rod - Sheet & Plate - Custom forgings and stamped parts --- ### **7. Key Features & Benefits** - **Excellent thermal expansion match** with glass and ceramics - **Good brazeability and weldability** - **High strength and ductility** in annealed condition - **Good corrosion resistance** in typical service environments - **Suitable for plating** (nickel, gold, silver) --- ### **8. Quality Assurance & Certification** - Certified mill test reports per **EN 10204 3.1/3.2** - Full traceability from melt to final product - Compliance with **ASTM, EN, JIS, and GB** standards --- **Note:** For optimal performance in glass or ceramic sealing, proper heat treatment and surface preparation are essential. Contact our technical team for specific application guidance and processing recommendations.

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 2443 gallon liquid totes Special package is available on request.