Alloy 42,Low expansion 42 Alloy Rod,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 ROD** **UNS K94100 - Precision Rod Product** --- ### **1. OVERVIEW** **Alloy 42**, commercially known as **Low Expansion 42 Alloy**, is a specialized **nickel-iron alloy** containing **42% nickel** that delivers an exceptionally **low coefficient of thermal expansion (CTE)**, closely matching **borosilicate glass, alumina ceramics, and critical semiconductor materials**. Supplied in **rod form**, this product provides machinists and manufacturers with raw material for creating precision components that maintain dimensional stability across temperature variations. The alloy is registered under the Unified Numbering System as **UNS K94100**. --- ### **2. CHEMICAL COMPOSITION (Weight %)** | Element | Alloy 42 Rod 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 | As-Drawn Condition | Annealed Condition | |---------------------------------|--------------------|--------------------| | **Coefficient of Thermal Expansion** | 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** | 580 – 720 MPa | 480 – 580 MPa | | **Yield Strength (0.2% Offset)**| 450 – 580 MPa | 250 – 350 MPa | | **Elongation (in 4D)** | 15 – 25% | 30 – 40% | | **Reduction of Area** | 35 – 50% | 50 – 65% | | **Modulus of Elasticity** | 145 GPa | 145 GPa | | **Hardness (Rockwell B)** | 85 – 100 HRB | 65 – 80 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 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 | | **Rod Standards** | ASTM B908, AMS 7721 | --- ### **5. ROD SPECIFICATIONS** #### **5.1 Diameter Ranges & Tolerances** - **Small Diameter**: 3.0 mm to 12.0 mm (±0.05 mm) - **Medium Diameter**: 12.0 mm to 50.0 mm (±0.08 mm) - **Large Diameter**: 50.0 mm to 150.0 mm (±0.13 mm) - **Special Sizes**: Custom diameters available on request #### **5.2 Straightness & Surface Finish** - **Straightness Tolerance**: 0.5 mm per 300 mm length - **Surface Roughness**: Ra 3.2 μm (as-drawn), Ra 1.6 μm (turned) - **Surface Condition**: Bright, scaled, or pickled finish available - **Out-of-Roundness**: ≤ 50% of diameter tolerance #### **5.3 Length & Cutting** - **Standard Lengths**: 3.0 meters, 3.66 meters, 4.0 meters - **Cut Lengths**: ±3 mm tolerance on specified lengths - **Custom Cutting**: Precision cutting to customer requirements - **End Finish**: Saw-cut, machined, or deburred --- ### **6. PRODUCT APPLICATIONS** #### **6.1 Electronics & Semiconductor** - **Lead Frame Pins**: Machined connector pins and headers - **Semiconductor Tooling**: Wafer handling and processing components - **Vacuum Feedthroughs**: Glass-to-metal seal studs and pins - **Chip Carrier Posts**: Support posts and mounting studs #### **6.2 Glass & Ceramic Sealing** - **Hermetic Seal Studs**: Precision machined sealing elements - **Ceramic Package Pins**: Lead frame attachment pins - **Optical Mounting Posts**: Laser and optical component supports - **Sensor Housings**: Pressure and temperature sensor bodies #### **6.3 Precision Instruments** - **Measuring Standards**: Precision gauge pins and reference standards - **Optical Benches**: Support rods and structural elements - **Laboratory Apparatus**: Scientific instrument components - **Alignment Pins**: Precision locating and alignment elements #### **6.4 Automotive & Aerospace** - **Sensor Shafts**: Automotive sensor rotating elements - **Avionics Mounts**: Electronic enclosure mounting posts - **Control Linkages**: Precision mechanical linkage components - **Instrument Pivots**: Gyroscope and accelerometer pivots --- ### **7. MACHINING & PROCESSING CHARACTERISTICS** #### **7.1 Machinability** - **Machinability Rating**: 25% (compared to 1212 steel at 100%) - **Recommended Tools**: Carbide inserts with sharp cutting edges - **Cutting Speeds**: 30-50 m/min for turning operations - **Feed Rates**: 0.1-0.3 mm/rev for optimal surface finish - **Coolant Requirements**: Recommended for all machining operations #### **7.2 Heat Treatment** - **Annealing Process**: 750-850°C followed by rapid cooling - **Stress Relieving**: 500-600°C for 1 hour per 25 mm thickness - **Atmosphere Control**: Hydrogen or vacuum for bright annealing - **Grain Size Control**: ASTM 5-7 for optimal machinability #### **7.3 Secondary Operations** - **Grinding**: Suitable for precision diameter control - **Centerless Grinding**: For improved surface finish and tolerance - **Polishing**: Can be polished to mirror finish - **Plating**: Compatible with nickel, gold, and tin plating --- ### **8. QUALITY ASSURANCE** #### **8.1 Material Certification** - **Chemical Analysis**: Certified spectrographic analysis - **Mechanical Testing**: Tensile and hardness certification - **Dimensional Inspection**: 100% diameter and straightness check - **Surface Quality**: Visual inspection for defects and imperfections #### **8.2 Testing & Verification** - **Ultrasonic Testing**: Available for critical applications - **Macroetch Testing**: For internal quality verification - **Grain Size Measurement**: ASTM E112 compliance - **CTE Verification**: Precision thermal expansion testing #### **8.3 Traceability & Documentation** - **Heat Number Traceability**: Full material history maintained - **Mill Certificates**: EN 10204 3.1/3.2 certification - **Process Control**: Statistical process monitoring records - **Custom Documentation**: Customer-specific certification available --- ### **9. TECHNICAL ADVANTAGES** - **Exceptional Dimensional Stability**: Maintains precision across temperature ranges - **Superior Machining Characteristics**: Good chip formation and surface finish - **Excellent Thermal Matching**: Perfect CTE compatibility with glass and ceramics - **High Strength-to-Weight Ratio**: Robust performance in precision applications - **Corrosion Resistance**: Suitable for most industrial environments - **Proven Reliability**: Consistent performance in critical applications --- ### **10. PACKAGING & HANDLING** - **Standard Packaging**: Bundled with protective caps and strapping - **Surface Protection**: Oiled or VCI paper wrapped for corrosion protection - **Identification**: Clear tagging with heat number and specifications - **Storage Recommendations**: Dry, indoor environment preferred - **Handling Guidelines**: Use appropriate lifting equipment to prevent bending --- **Note:** For precision machining applications, stress relieving after rough machining is recommended to maintain dimensional stability. Consultation with our technical team is advised for critical applications requiring specific thermal expansion characteristics or specialized processing. Sample material available for machining trials and process development.

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 2457 gallon liquid totes Special package is available on request.