Alloy 42,Low expansion 42 Alloy Fittings,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 FITTINGS** **UNS K94100 - Precision Fittings & Components** --- ### **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)**, engineered to perfectly match **borosilicate glass, alumina ceramics, and semiconductor materials**. Manufactured as **precision fittings**, these components ensure reliable thermal compatibility and dimensional stability in critical piping and assembly applications. The alloy is registered under the Unified Numbering System as **UNS K94100**. --- ### **2. CHEMICAL COMPOSITION (Weight %)** | Element | Alloy 42 Fittings 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) | |---------------------------------|--------------------------| | **CTE (20–300°C)** | 4.5 – 5.5 × 10⁻⁶/°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)** | 70 – 85 HRB | | **Electrical Resistivity** | 0.75 μΩ·m | | **Thermal Conductivity** | 14.5 W/m·K | | **Pressure Rating** | Schedule 40/80 compatible | --- ### **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 | | **Fitting Standards** | ASTM B366, ASME B16.9, B16.11 | --- ### **5. FITTING TYPES & SPECIFICATIONS** #### **5.1 Butt-Weld Fittings** - **Elbows**: 45°, 90°, 180° (1/8" to 12" NPS) - **Tees**: Equal and reducing (1/8" to 12" NPS) - **Reducers**: Concentric and eccentric (1/8" to 12" NPS) - **Caps**: Pipe caps and closures (1/8" to 12" NPS) #### **5.2 Socket-Weld Fittings** - **Couplings**: Socket weld couplings (1/8" to 2" NPS) - **Unions**: Socket weld unions (1/8" to 2" NPS) - **Elbows**: 45° and 90° socket weld (1/8" to 2" NPS) - **Tees**: Socket weld tees (1/8" to 2" NPS) #### **5.3 Flanged Components** - **Flanges**: Slip-on, weld neck, blind flanges - **Adapter Rings**: Transition flanges - **Special Shapes**: Custom flange configurations --- ### **6. PRODUCT APPLICATIONS** #### **6.1 Semiconductor Manufacturing** - **Gas Distribution Systems**: High-purity gas line fittings - **Vacuum Chamber Connections**: UHV and HV fitting components - **Chemical Delivery Systems**: Corrosive fluid handling fittings - **Wafer Processing Equipment**: Process chamber connection fittings #### **6.2 Aerospace & Defense** - **Avionics Cooling Systems**: Thermal management system fittings - **Fuel System Components**: Aircraft fuel line fittings - **Cryogenic Systems**: Liquid gas transfer line fittings - **Radar Waveguide Assemblies**: RF transmission system fittings #### **6.3 Scientific Instruments** - **Electron Microscope Components**: Vacuum system fittings - **Particle Accelerator Systems**: Beam line connection fittings - **Laboratory Instrumentation**: Precision fluid handling fittings - **Research Equipment**: Specialized connection system fittings #### **6.4 Industrial Applications** - **Glass Sealing Systems**: Molten glass handling system fittings - **Precision Instrumentation**: Measurement device plumbing fittings - **Thermal Management**: Heat transfer system connection fittings - **Process Piping**: Specialized industrial process line fittings --- ### **7. TECHNICAL SPECIFICATIONS** #### **7.1 Size Range & Pressure Ratings** - **Pipe Size**: 1/8" to 12" NPS (DN6 to DN300) - **Wall Thickness**: Schedule 5S to Schedule 80 - **Pressure Class**: 150# to 1500# - **Temperature Rating**: -196°C to 400°C #### **7.2 Manufacturing Standards** - **Dimensional**: ASME B16.9, B16.11, B16.28 - **Tolerance**: Standard and special tolerances available - **Testing**: Hydrostatic, pneumatic, NDT testing - **Certification**: PED 2014/68/EU, NACE MR0175 #### **7.3 Material Condition** - **Solution Annealed**: 750-850°C, rapid cooling - **Stress Relieved**: 500-600°C, controlled cooling - **Surface Finish**: Pickled, passivated, or electropolished - **Marking**: Laser etched per ASTM A960 --- ### **8. FABRICATION & INSTALLATION** #### **8.1 Machining & Processing** - **Machinability**: Good with proper tools and techniques - **Cutting Speed**: Moderate with adequate cooling - **Tool Material**: Carbide or high-speed steel recommended - **Surface Finish**: Can be precision machined to tight tolerances #### **8.2 Welding Procedures** - **Welding Process**: GTAW (TIG) recommended for critical applications - **Filler Metal**: Alloy 42 matching composition - **Shielding Gas**: Argon or argon/hydrogen mixture - **Preheat/Postheat**: Generally not required for thin sections #### **8.3 Quality Control** - **Dimensional Inspection**: 100% verification to specifications - **Surface Examination**: Visual and liquid penetrant testing - **Pressure Testing**: Hydrostatic testing per applicable standards - **Documentation**: Complete certification package provided --- ### **9. QUALITY ASSURANCE** #### **9.1 Material Certification** - **Chemical Analysis**: Certified spectrographic analysis - **Mechanical Testing**: Tensile and hardness certification - **Metallurgical Tests**: Grain size and microstructure examination - **Traceability**: Full material history from melt to finished part #### **9.2 Testing & Inspection** - **Non-Destructive Testing**: RT, UT, MT, PT as required - **Pressure Testing**: Hydrostatic and pneumatic testing - **Leak Testing**: Helium leak detection for vacuum applications - **Dimensional Verification**: First article and production inspection #### **9.3 Compliance & Certification** - **Quality Systems**: ISO 9001, AS9100, NADCAP - **Material Certificates**: EN 10204 3.1/3.2 - **Industry Standards**: ASTM, ASME, ANSI compliance - **Customer Specifications**: Custom certification available --- ### **10. TECHNICAL ADVANTAGES** - **Perfect CTE Match**: Excellent thermal compatibility with glass and ceramics - **Superior Dimensional Stability**: Maintains precision across temperature ranges - **Excellent Weldability**: Compatible with standard welding methods - **Good Corrosion Resistance**: Suitable for most chemical environments - **High Temperature Capability**: Service up to 400°C continuous - **Vacuum Compatibility**: Low outgassing characteristics --- **Note:** For critical applications involving high vacuum, ultra-high purity, or extreme temperatures, special processing and testing protocols are available. Consult our technical team for specific application requirements and custom fitting solutions. Prototype development and testing services offered 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 2464 gallon liquid totes Special package is available on request.