Alloy 42,Low expansion 42 Alloy Pipe,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 PIPE** **UNS K94100 - Seamless & Welded Pipe Products** --- ### **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 critical semiconductor materials**. Supplied in **pipe form**, this product provides optimal thermal stability for fluid handling systems requiring minimal dimensional change across temperature variations. The alloy is registered under the Unified Numbering System as **UNS K94100**. --- ### **2. CHEMICAL COMPOSITION (Weight %)** | Element | Alloy 42 Pipe 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 | Seamless Pipe (Annealed) | Welded Pipe (Annealed) | |---------------------------------|--------------------------|------------------------| | **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** | 510 – 610 MPa | 500 – 600 MPa | | **Yield Strength (0.2% Offset)**| 270 – 370 MPa | 260 – 360 MPa | | **Elongation (in 2")** | 30 – 40% | 28 – 38% | | **Modulus of Elasticity** | 145 GPa | 145 GPa | | **Hardness (Rockwell B)** | 65 – 80 HRB | 63 – 78 HRB | | **Electrical Resistivity** | 0.75 μΩ·m | 0.75 μΩ·m | | **Thermal Conductivity** | 14.5 W/m·K | 14.5 W/m·K | | **Maximum Service Temperature** | 400°C | 400°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 | | **Pipe Standards** | ASTM B724, ASME SB-724 | --- ### **5. PIPE SPECIFICATIONS** #### **5.1 Seamless Pipe** - **Size Range**: 6 mm OD to 150 mm OD - **Wall Thickness**: 1.0 mm to 12.5 mm - **Schedule Availability**: Schedule 5S to Schedule 80 - **Length**: Standard 3-6 meters, custom lengths available - **Tolerance**: Per ASTM B724 requirements #### **5.2 Welded Pipe** - **Size Range**: 12 mm OD to 300 mm OD - **Wall Thickness**: 1.5 mm to 8.0 mm - **Welding Method**: TIG welded, full penetration - **Weld Quality**: Radiographically tested - **Length**: Standard 3-6 meters, custom lengths available #### **5.3 Surface Finish & Condition** - **Surface Finish**: Pickled, passivated, or electropolished - **Heat Treatment**: Solution annealed and quenched - **End Finish**: Square cut, deburred, beveled ends - **Straightness**: 1.5 mm per meter maximum --- ### **6. PRODUCT APPLICATIONS** #### **6.1 Semiconductor Manufacturing** - **Ultra-Pure Gas Lines**: High-purity gas distribution systems - **Chemical Delivery Pipes**: Process chemical transport lines - **Vacuum Chamber Piping**: UHV and HV system components - **Wafer Process Pipes**: Cleaning and etching solution handling #### **6.2 Aerospace & Defense** - **Cryogenic Transfer Lines**: Liquid gas transport systems - **Avionics Cooling Pipes**: Thermal management systems - **Fuel System Components**: Aircraft fuel line applications - **Environmental Control**: Cabin air system piping #### **6.3 Scientific Research** - **Particle Accelerator Components**: Beam line vacuum pipes - **Laboratory Instrumentation**: Research equipment plumbing - **Cryogenic Systems**: Liquid helium and nitrogen transfer - **Analytical Equipment**: Spectrometer and analyzer piping #### **6.4 Industrial Applications** - **Glass Sealing Systems**: Molten glass handling pipes - **Precision Instrumentation**: Measurement device plumbing - **Thermal Management**: Heat transfer system components - **Process Piping**: Specialized industrial process lines --- ### **7. TECHNICAL SPECIFICATIONS** #### **7.1 Pressure Ratings** - **Schedule 5S**: Low pressure applications - **Schedule 10S**: Medium pressure service - **Schedule 40**: Standard pressure applications - **Schedule 80**: High pressure service #### **7.2 Temperature Performance** - **Cryogenic Service**: Down to -196°C (liquid nitrogen) - **Room Temperature**: Optimal CTE performance - **Elevated Temperature**: Up to 400°C continuous - **Thermal Cycling**: Excellent fatigue resistance #### **7.3 Corrosion Resistance** - **Atmospheric**: Good corrosion resistance - **Chemical**: Resistant to most organic chemicals - **Aqueous**: Suitable for pure water systems - **Oxidation**: Good oxidation resistance to 400°C --- ### **8. FABRICATION & INSTALLATION** #### **8.1 Cutting & Preparation** - **Cutting Methods**: Band saw, abrasive saw, plasma cutting - **End Preparation**: Machined bevels for welding - **Deburring**: Required for all cut ends - **Cleaning**: Essential for high-purity applications #### **8.2 Welding Procedures** - **Welding Process**: GTAW (TIG) recommended - **Filler Metal**: Alloy 42 matching composition - **Shielding Gas**: Argon or argon/hydrogen mixture - **Purge Gas**: Required for interior protection #### **8.3 Bending & Forming** - **Bend Radius**: Minimum 3× OD for cold bending - **Heat Treatment**: Stress relieving after forming - **Tooling**: Mandrel bending for thin-wall pipes - **Springback**: Account for 2-3° springback --- ### **9. QUALITY ASSURANCE** #### **9.1 Material Certification** - **Chemical Analysis**: Certified for each heat - **Mechanical Testing**: Tensile and hardness certification - **Dimensions**: Verified to specified tolerances - **Surface Quality**: Per ASTM A480 requirements #### **9.2 Non-Destructive Testing** - **Hydrostatic Testing**: Standard for all pressure pipes - **Radiographic Testing**: 100% for welded pipes - **Ultrasonic Testing**: For seamless pipe integrity - **Dye Penetrant**: Weld and critical area inspection #### **9.3 Cleanliness & Packaging** - **Cleanroom Packaging**: For semiconductor grades - **End Protection**: Plastic caps for all pipe ends - **Surface Protection**: VCI paper or plastic wrapping - **Identification**: Permanent marking per ASTM A960 --- ### **10. TECHNICAL ADVANTAGES** - **Exceptional Thermal Stability**: Minimal dimensional change with temperature - **Excellent Weldability**: Compatible with standard welding methods - **Superior Surface Quality**: Ideal for high-purity applications - **Good Corrosion Resistance**: Suitable for most industrial environments - **Proven Performance**: Reliable service in critical applications - **Vacuum Compatibility**: Low outgassing characteristics --- **Note:** For high-purity or ultra-high vacuum applications, special cleaning and passivation processes are recommended. Consult our technical team for specific application requirements and processing guidelines. Custom sizes and special testing 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 2459 gallon liquid totes Special package is available on request.