Alloy 42,Low expansion 42 Alloy Wire,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 / LOW EXPANSION 42 ALLOY WIRE** **UNS K94100 - Precision Wire Products** --- ### **1. OVERVIEW** **Alloy 42**, commercially known as **Low Expansion 42 Alloy**, is a precision **nickel-iron alloy** containing **42% nickel** that delivers an exceptionally **low coefficient of thermal expansion (CTE)**, specifically engineered to match **borosilicate glass, alumina ceramics, and semiconductor materials**. Manufactured as **precision wire**, this product offers exceptional dimensional stability and formability for applications requiring linear components with precise thermal matching characteristics. The alloy is registered under the Unified Numbering System as **UNS K94100**. --- ### **2. CHEMICAL COMPOSITION (Weight %)** | Element | Alloy 42 Wire Specification | 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 | Annealed Condition | Hard Drawn Condition | |---------------------------------|--------------------|----------------------| | **CTE (20–300°C)** | 4.5 – 5.5 × 10⁻⁶/°C | 4.5 – 5.5 × 10⁻⁶/°C | | **Density (g/cm³)** | 8.11 | 8.11 | | **Tensile Strength (MPa)** | 450 – 550 | 700 – 900 | | **Yield Strength (MPa)** | 250 – 350 | 600 – 800 | | **Elongation (%)** | 30 – 40 | 8 – 15 | | **Electrical Resistivity (μΩ·m)** | 0.75 | 0.75 | | **Thermal Conductivity (W/m·K)** | 14.5 | 14.5 | | **Hardness (HV)** | 130 – 170 | 200 – 250 | --- ### **4. INTERNATIONAL STANDARDS & EQUIVALENTS** | Standard Organization | Designation & Specification | |-----------------------|----------------------------| | **UNS** | K94100 | | **ASTM** | F30 (Alloy 42) | | **EN (European)** | 1.3917 (Ni42Fe) | | **ISO** | NiFe42 | | **JIS (Japan)** | C42N | | **GB (China)** | 4J42 | | **DIN (Germany)** | Ni42 | | **Wire Standards** | ASTM B749, AMS 7721 | --- ### **5. WIRE SPECIFICATIONS** #### **5.1 Diameter Ranges** - **Fine Wire**: 0.05 mm to 0.50 mm (±0.002 mm) - **Medium Wire**: 0.50 mm to 2.00 mm (±0.005 mm) - **Coarse Wire**: 2.00 mm to 6.00 mm (±0.01 mm) - **Special Sizes**: Custom diameters available #### **5.2 Temper Conditions** - **Annealed (Soft)**: Optimal for forming and weaving - **Quarter-Hard**: Good formability with moderate strength - **Half-Hard**: Balanced formability and spring properties - **Hard Drawn**: Maximum strength for spring applications #### **5.3 Surface Finish** - **Bright Finish**: Standard smooth surface - **Oxidized Finish**: Heat-treated oxide layer - **Coated Wire**: Tin, nickel, or silver plated - **Special Finish**: Custom surface treatments available --- ### **6. PRODUCT APPLICATIONS** #### **6.1 Electronics & Electrical** - **Lead Frames**: IC and transistor lead wires - **Resistor Wire**: Precision resistance elements - **Connector Pins**: Electronic connector components - **Fuse Elements**: Current-limiting fuse wire #### **6.2 Glass & Ceramic Sealing** - **Feedthrough Wires**: Glass-to-metal seal components - **Header Pins**: Ceramic package lead wires - **Sealing Studs**: Hermetic sealing elements - **Support Wires**: Glass assembly support elements #### **6.3 Automotive Electronics** - **Sensor Elements**: Automotive sensor components - **Ignition Parts**: Ignition system wire elements - **Connector Terminals**: Wire form connectors - **Control Modules**: ECU internal wire components #### **6.4 Consumer Electronics** - **Battery Contacts**: Spring contact wires - **Display Components**: Display mounting wires - **Audio Equipment**: Speaker voice coil wires - **Communication Devices**: RF component wires --- ### **7. TECHNICAL ADVANTAGES** #### **7.1 Thermal Performance** - **Perfect CTE Match**: Compatible with glass and ceramics - **Thermal Stability**: Maintains properties across temperature ranges - **Low Thermal EMF**: Suitable for precision measurement applications - **Heat Resistance**: Service up to 400°C continuous #### **7.2 Mechanical Properties** - **Excellent Formability**: Can be bent, coiled, and shaped - **Good Spring Properties**: Suitable for spring applications - **High Strength**: Maintains integrity in thin diameters - **Fatigue Resistance**: Excellent for dynamic applications #### **7.3 Electrical Characteristics** - **Controlled Resistivity**: Consistent electrical properties - **Low Magnetic Permeability**: Near-zero magnetostriction - **Stable Characteristics**: Minimal aging effects - **Welding Compatibility**: Good weldability characteristics --- ### **8. PROCESSING CHARACTERISTICS** #### **8.1 Forming & Fabrication** - **Bending**: Minimum bend radius 1× diameter - **Coiling**: Suitable for precision spring coiling - **Heading**: Can be upset and formed - **Swaging**: Compatible with swaging operations #### **8.2 Joining Methods** - **Resistance Welding**: Excellent weldability - **TIG Welding**: Suitable for precision welding - **Laser Welding**: Ideal for micro-joining - **Brazing**: Compatible with standard brazing alloys #### **8.3 Heat Treatment** - **Annealing**: 750-850°C in protective atmosphere - **Stress Relieving**: 400-500°C for 15-30 minutes - **Grain Size Control**: ASTM 7-9 for optimal properties - **Atmosphere**: Hydrogen or vacuum recommended --- ### **9. QUALITY ASSURANCE** #### **9.1 Dimensional Control** - **Diameter Tolerance**: Continuously monitored during drawing - **Surface Quality**: 100% visual inspection for critical grades - **Roundness**: Controlled to tight tolerances - **Length Accuracy**: Precise cut-length control #### **9.2 Material Testing** - **Chemical Analysis**: Spectrometer verification for each heat - **Mechanical Testing**: Tensile and elongation testing - **Surface Inspection**: Microscope examination for defects - **Electrical Testing**: Resistivity verification #### **9.3 Special Testing** - **CTE Verification**: Precision thermal expansion measurement - **Weldability Testing**: Joint strength and quality assessment - **Cleanliness Testing**: Surface contamination analysis - **Metallographic Examination**: Grain structure evaluation --- ### **10. PACKAGING OPTIONS** #### **10.1 Standard Packaging** - **Spool Sizes**: 5 kg to 200 kg capacity - **Coil Dimensions**: Custom sizes available - **Protective Wrapping**: Anti-corrosion papers and films - **Identification**: Continuous marking with specifications #### **10.2 Special Packaging** - **Cleanroom Packaging**: Class 1000 environment - **ESD Protection**: Anti-static packaging materials - **Vacuum Sealing**: Moisture-proof packaging - **Custom Labeling**: Customer-specific identification --- ### **11. INDUSTRY COMPLIANCE** - **Electronics**: IPC, JEDEC standards - **Automotive**: IATF 16949 requirements - **Aerospace**: AS9100, AMS specifications - **Medical**: ISO 13485 compliance - **General**: ISO 9001 quality systems --- **Note:** For specific applications requiring unique diameter tolerances, special temper conditions, or customized testing, please consult our technical team. Sample materials and technical support are available for application development and process optimization.

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 2468 gallon liquid totes Special package is available on request.