Alloy 42,Low expansion 42 Alloy Forgings,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 FORGINGS** **UNS K94100 - Forged Components** --- ### **1. OVERVIEW** **Alloy 42**, commercially known as **Low Expansion 42 Alloy**, is a specialized **nickel-iron alloy** containing precisely **42% nickel** that delivers an exceptionally **low coefficient of thermal expansion (CTE)**, engineered to perfectly match **borosilicate glass, alumina ceramics, and semiconductor materials**. Manufactured through **forging processes**, these components offer superior mechanical properties, refined grain structure, and enhanced structural integrity for demanding applications. The alloy is registered under the Unified Numbering System as **UNS K94100**. --- ### **2. CHEMICAL COMPOSITION (Weight %)** | Element | Alloy 42 Forgings 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-Forged Condition | Heat-Treated Condition | |---------------------------------|--------------------|------------------------| | **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** | 580 – 720 MPa | 520 – 620 MPa | | **Yield Strength (0.2% Offset)**| 380 – 520 MPa | 280 – 380 MPa | | **Elongation (in 2")** | 20 – 30% | 30 – 40% | | **Reduction of Area** | 35 – 50% | 50 – 65% | | **Impact Strength (Charpy V)** | 35 – 60 J | 50 – 80 J | | **Hardness (Rockwell B)** | 85 – 100 HRB | 70 – 85 HRB | | **Fatigue Strength** | 240 – 280 MPa | 220 – 260 MPa | --- ### **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 | | **Forging Standards** | ASTM B788, AMS 7721 | --- ### **5. FORGING CAPABILITIES** #### **5.1 Forging Processes** - **Open Die Forgings**: 5 kg to 2000 kg capacity - **Closed Die Forgings**: Complex geometries with minimal machining allowance - **Ring Rolling**: Diameters up to 4000 mm - **Precision Forgings**: Near-net shape components #### **5.2 Forging Temperature Range** - **Heating Temperature**: 1150 – 1250°C - **Forging Start**: 1100 – 1200°C - **Forging Finish**: ≥ 850°C - **Cooling Method**: Controlled air cooling or furnace cooling #### **5.3 Heat Treatment** - **Solution Annealing**: 850 – 950°C, rapid cooling - **Stress Relieving**: 500 – 600°C, 1-2 hours per inch thickness - **Grain Size Control**: ASTM 5-7 for optimal properties - **Quality Heat Treatment**: Certified furnace operations --- ### **6. PRODUCT APPLICATIONS** #### **6.1 Semiconductor Equipment** - **Vacuum Chamber Components**: Chamber flanges and fittings - **Wafer Handling Systems**: Robotic arms and end effectors - **Process Module Frames**: Structural support components - **Gas Distribution Systems**: Manifolds and valve bodies #### **6.2 Aerospace & Defense** - **Satellite Structures**: Mounting brackets and frames - **Avionics Housings**: Instrument enclosures and supports - **Optical Systems**: Telescope mounts and alignment frames - **Radar Components**: Waveguide supports and antenna elements #### **6.3 Power Generation** - **Nuclear Instrumentation**: Control rod drive components - **Turbine Components**: Non-rotating structural parts - **Transformer Systems**: Core clamps and structural elements - **Switchgear Components**: Circuit breaker mechanisms #### **6.4 Industrial Equipment** - **Glass Sealing Machines**: Heating elements and supports - **Precision Instruments**: Measurement equipment frames - **Laser Systems**: Optical bench components and mounts - **Cryogenic Equipment**: Support structures and fittings --- ### **7. TECHNICAL ADVANTAGES** #### **7.1 Metallurgical Benefits** - **Refined Grain Structure**: Superior to cast or wrought products - **Improved Density**: Elimination of internal porosity - **Enhanced Mechanical Properties**: Superior strength and toughness - **Optimal Grain Flow**: Contoured to component shape for maximum strength #### **7.2 Performance Advantages** - **Superior Fatigue Resistance**: Ideal for cyclic loading applications - **Enhanced Impact Toughness**: Suitable for shock load conditions - **Better Stress Distribution**: Uniform properties throughout cross-section - **Improved Reliability**: Consistent performance in critical applications --- ### **8. QUALITY ASSURANCE** #### **8.1 Material Certification** - **Chemical Analysis**: Certified spectrographic analysis - **Mechanical Testing**: Full suite of mechanical property tests - **Metallurgical Examination**: Grain size and microstructure analysis - **Non-Destructive Testing**: UT, RT, MT, PT as specified #### **8.2 Dimensional Control** - **First Article Inspection**: Comprehensive dimensional verification - **Process Control**: Statistical monitoring of forging parameters - **Final Inspection**: 100% dimensional and surface inspection - **Documentation**: Complete inspection records and certifications #### **8.3 Testing Capabilities** - **Ultrasonic Testing**: Per ASTM A388 for internal quality - **Magnetic Particle**: Per ASTM E709 for surface defects - **Liquid Penetrant**: Per ASTM E165 for non-magnetic applications - **Radiographic Testing**: Per ASTM E94 for critical sections --- ### **9. DESIGN & ENGINEERING SUPPORT** #### **9.1 Technical Services** - **Forging Design**: Optimization for manufacturability and performance - **Process Simulation**: Finite element analysis of forging process - **Material Selection**: Guidance on heat treatment and processing - **Application Engineering**: Component design and optimization #### **9.2 Custom Capabilities** - **Prototype Development**: Small quantity prototype forgings - **Material Testing**: Specialized testing for specific applications - **Custom Heat Treatment**: Tailored thermal processing - **Special Testing**: Application-specific validation testing --- ### **10. INDUSTRY COMPLIANCE** - **Aerospace**: NAS, AMS, and customer-specific standards - **Nuclear**: ASME Section III, NQA-1 requirements - **Defense**: MIL standards and customer specifications - **Commercial**: ISO 9001, AS9100 quality systems - **Documentation**: Full material and process traceability --- **Note:** Forging design and process parameters significantly impact final component properties. Early consultation with our engineering team is recommended to optimize design for forging and ensure maximum performance in your specific application. Prototype development and testing services available for new applications.

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 2465 gallon liquid totes Special package is available on request.