Alloy 42,Nilo 42 Bar(Round bar, Flat bar),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 BAR** **UNS K94100 - Round Bar & Flat Bar** --- ### **1. OVERVIEW** Alloy 42 (commercially known as **Nilo 42**) is a **nickel-iron alloy** containing approximately **42% nickel**, specifically engineered to provide a **thermal expansion coefficient** that closely matches **borosilicate glass, alumina ceramics, and certain semiconductor materials**. Available in **round bar and flat bar** forms, this material is ideal for machined components requiring dimensional stability across temperature variations. The alloy is registered under the Unified Numbering System as **UNS K94100**. --- ### **2. CHEMICAL COMPOSITION (Weight %)** | Element | Alloy 42 / Nilo 42 Bar | 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 | Round Bar (Annealed) | Flat Bar (Annealed) | |---------------------------------|----------------------|------------------------| | **CTE (20–300°C)** | 4.5 – 5.5 × 10⁻⁶/°C | 4.5 – 5.5 × 10⁻⁶/°C | | **Density** | 8.11 g/cm³ | 8.11 g/cm³ | | **Melting Point** | 1420 – 1450°C | 1420 – 1450°C | | **Tensile Strength** | 520 – 620 MPa | 540 – 640 MPa | | **Yield Strength (0.2% Offset)**| 280 – 380 MPa | 300 – 400 MPa | | **Elongation (in 2")** | 30 – 40% | 25 – 35% | | **Modulus of Elasticity** | 145 GPa | 145 GPa | | **Hardness (Rockwell B)** | 65 – 80 HRB | 70 – 85 HRB | | **Electrical Resistivity** | 0.75 μΩ·m | 0.75 μΩ·m | | **Thermal Conductivity** | 14.5 W/m·K | 14.5 W/m·K | --- ### **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** #### **Round Bar Applications** - **Precision shafts** for optical and electronic equipment - **Machined connectors** for glass-to-metal seals - **Semiconductor processing components** - **Support rods** in vacuum and cryogenic systems - **Fastener stock** for thermal-stable assemblies #### **Flat Bar Applications** - **Structural frames** for electronic packaging - **Mounting brackets** for sensors and instruments - **Lead frame substrates** - **Heat sink bases** for power electronics - **Machined spacers** and shims --- ### **6. PRODUCT SPECIFICATIONS** #### **Round Bar** - **Diameter Range**: 3 mm to 200 mm - **Length**: Standard 3-4 meters, custom lengths up to 6 meters - **Tolerance**: ISO h8-h11 or per customer requirements - **Surface Finish**: Cold-drawn, turned, ground, or centerless ground #### **Flat Bar** - **Thickness**: 3 mm to 100 mm - **Width**: 10 mm to 300 mm - **Length**: Standard 3-4 meters, custom lengths available - **Edge Condition**: As-rolled, machined, or precision ground --- ### **7. KEY FEATURES & BENEFITS** - **Excellent CTE Match** with glass and ceramics for reliable sealing - **Superior Machinability** for complex component manufacturing - **Good Weldability** using TIG, MIG, and resistance welding methods - **High Strength-to-Weight Ratio** for structural applications - **Corrosion Resistance** in typical service environments - **Thermal Stability** across wide temperature ranges (-100°C to +400°C) --- ### **8. PROCESSING & FABRICATION** - **Machining**: Suitable for turning, milling, drilling, and threading - **Heat Treatment**: Annealing at 750-850°C recommended for optimal properties - **Welding**: Compatible with common welding techniques; use matching filler material - **Surface Treatment**: Accepts various platings (nickel, gold, silver) and coatings --- ### **9. QUALITY ASSURANCE** - **Certification**: Mill test reports per EN 10204 3.1/3.2 - **Traceability**: Full material history from melt to final product - **Testing**: Chemical analysis, mechanical testing, non-destructive testing available - **Compliance**: Meets ASTM, EN, ISO, JIS, and GB standards --- **Note:** For applications requiring specific thermal expansion characteristics or mechanical properties, contact our technical team for customized heat treatment recommendations and processing guidance.

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 2445 gallon liquid totes Special package is available on request.