Alloy 42,Low expansion 42 Alloy Plate,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 PLATE** **UNS K94100 - Plate Product Form** --- ### **1. OVERVIEW** **Alloy 42**, commercially known as **Low Expansion 42 Alloy**, is a specialized **nickel-iron alloy** containing precisely **42% nickel** that exhibits an exceptionally **low coefficient of thermal expansion (CTE)**, carefully engineered to match **borosilicate glass, alumina ceramics, and critical semiconductor materials**. Supplied in **plate form**, this product provides excellent dimensional stability and thermal compatibility for applications requiring flat, stable surfaces and structural components. The alloy is registered under the Unified Numbering System as **UNS K94100**. --- ### **2. CHEMICAL COMPOSITION (Weight %)** | Element | Alloy 42 Plate 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 | Typical Value (Annealed Condition) | |---------------------------------|-----------------------------------| | **Coefficient of Thermal Expansion** | 4.5 – 5.5 × 10⁻⁶/°C (20–300°C) | | **Density** | 8.11 g/cm³ | | **Melting Point** | 1420 – 1450°C | | **Tensile Strength** | 520 – 620 MPa | | **Yield Strength (0.2% Offset)**| 280 – 380 MPa | | **Elongation (in 2")** | 30 – 40% | | **Modulus of Elasticity** | 145 GPa | | **Hardness (Rockwell B)** | 65 – 80 HRB | | **Electrical Resistivity** | 0.75 μΩ·m | | **Thermal Conductivity** | 14.5 W/m·K | | **Curie Temperature** | 360°C | --- ### **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 | | **Plate Standards** | ASTM A480, AMS 7721 | --- ### **5. PLATE SPECIFICATIONS** #### **5.1 Standard Plate** - **Thickness Range**: 3.0 mm to 50 mm - **Width Range**: 500 mm to 1500 mm - **Length Range**: 1000 mm to 3000 mm - **Thickness Tolerance**: ±0.15 mm to ±0.80 mm - **Flatness**: 5 mm per meter maximum #### **5.2 Precision Plate** - **Thickness Range**: 1.0 mm to 20 mm - **Width Range**: 300 mm to 1000 mm - **Length Range**: 1000 mm to 2000 mm - **Thickness Tolerance**: ±0.05 mm to ±0.25 mm - **Flatness**: 2 mm per meter maximum #### **5.3 Surface Finish Options** - **Hot-Rolled**: Annealed and pickled finish - **Cold-Rolled**: Smooth matte finish - **Machined**: Precision machined surfaces - **Polished**: Mirror or decorative finishes --- ### **6. PRODUCT APPLICATIONS** #### **6.1 Electronics & Semiconductor** - **Lead Frame Substrates**: Integrated circuit lead frame bases - **Semiconductor Bases**: Power device mounting plates - **Hybrid Circuit Bases**: Thick-film circuit substrates - **Electronic Package Bases**: Hermetic package base plates #### **6.2 Glass-to-Metal Sealing** - **Hermetic Seal Bases**: Connector and sensor base plates - **Optical Window Frames**: Laser and optical package frames - **Ceramic Package Plates**: Multi-layer package base plates - **Feedthrough Mounting**: Electrical feedthrough mounting plates #### **6.3 Precision Instruments** - **Optical Mounting Plates**: Telescope and laser mounting bases - **Measuring Equipment**: Coordinate measuring machine tables - **Laboratory Apparatus**: Scientific instrument base plates - **Metrology Standards**: Precision reference surfaces #### **6.4 Industrial Applications** - **Mold Bases**: Composite curing tools and molds - **Fixture Plates**: Manufacturing jig and fixture bases - **Structural Components**: Precision machine frame elements - **Thermal Management**: Heat sink base plates --- ### **7. MACHINING & FABRICATION** #### **7.1 Machining Characteristics** - **Machinability Rating**: 25% (compared to 1212 steel) - **Recommended Tools**: Carbide tools with positive rake angles - **Cutting Speeds**: 30-50 m/min for milling operations - **Feed Rates**: 0.1-0.3 mm/tooth for optimal finish - **Coolant**: Recommended for all machining operations #### **7.2 Forming & Welding** - **Bend Radius**: Minimum 2× thickness for 90° bends - **Punching**: Suitable for blanking and piercing operations - **Welding Methods**: GTAW (TIG), GMAW (MIG), laser welding - **Filler Metal**: Matching composition recommended #### **7.3 Heat Treatment** - **Annealing Temperature**: 750-850°C followed by rapid cooling - **Stress Relieving**: 500-600°C for 1-2 hours - **Atmosphere Control**: Hydrogen or vacuum for bright annealing - **Grain Size Control**: ASTM 5-8 for optimal properties --- ### **8. QUALITY ASSURANCE** #### **8.1 Material Certification** - **Chemical Analysis**: Certified spectrographic analysis - **Mechanical Testing**: Tensile and hardness certification - **Dimensional Report**: Full dimensional verification - **Surface Quality**: Per ASTM A480 requirements #### **8.2 Testing & Inspection** - **Ultrasonic Testing**: For internal quality assessment - **Flatness Measurement**: Precision straightedge verification - **Surface Roughness**: Ra measurement per specification - **Visual Inspection**: 100% surface examination #### **8.3 Traceability & Documentation** - **Heat Number Tracking**: Full material history maintained - **Mill Certificates**: EN 10204 3.1/3.2 certification - **Process Control Records**: Complete manufacturing documentation - **Custom Marking**: Customer-specific identification available --- ### **9. TECHNICAL ADVANTAGES** - **Exceptional Thermal Stability**: Maintains flatness and dimensions across temperature ranges - **Superior Surface Quality**: Ideal for precision mounting and sealing applications - **Excellent Machinability**: Can be precision machined to tight tolerances - **Perfect CTE Matching**: Optimal for glass and ceramic interface applications - **High Strength**: Robust performance in structural applications - **Good Weldability**: Compatible with standard welding processes --- ### **10. PACKAGING & DELIVERY** #### **10.1 Standard Packaging** - **Individual Wrapping**: Protective paper or plastic wrapping - **Stacking**: Separated with protective interleaving - **Edge Protection**: Corner guards and edge protectors - **Wooden Crating**: For large or heavy plates #### **10.2 Special Requirements** - **Cleanroom Packaging**: Class 1000 environment available - **VCI Protection**: Volatile corrosion inhibitor packaging - **Custom Sizes**: Plasma or waterjet cut to customer patterns - **Just-in-Time Delivery**: Scheduled delivery programs --- **Note:** For critical applications requiring precise flatness or specific thermal expansion characteristics, consultation with our technical team is recommended. Stress relieving after rough machining is advised for components requiring dimensional stability. Material samples and technical data sheets available upon request.

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 2461 gallon liquid totes Special package is available on request.