Alloy 39，Low Expansion 39 Alloy Tube，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 39 / Low Expansion 39 Alloy Tube** **Precision Tubing for Critical Thermal Management Applications** **Alloy 39 Tube** is a specialized nickel-iron-cobalt alloy tubing engineered to deliver exceptional dimensional stability and controlled thermal expansion in precision applications. This advanced material maintains consistent performance across wide temperature ranges, making it the ideal choice for aerospace, semiconductor, and scientific instrumentation applications where thermal stability and reliability are paramount. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 38.0 - 40.0 | | **Cobalt (Co)** | 14.0 - 16.0 | | **Iron (Fe)** | Balance | | **Manganese (Mn)** | 0.50 max | | **Silicon (Si)** | 0.30 max | | **Carbon (C)** | 0.05 max | | **Chromium (Cr)** | 0.20 max | | **Aluminum (Al)** | 0.10 max | | **Copper (Cu)** | 0.20 max | | **Titanium (Ti)** | 0.10 max | | **Sulfur (S)** | 0.015 max | | **Phosphorus (P)** | 0.015 max | * **Optimized Formula:** The precise balance of 38-40% nickel and 14-16% cobalt ensures minimal thermal expansion while maintaining excellent mechanical properties and corrosion resistance in tubular applications. --- #### **2. Physical Properties** | Property | Value | | :--- | :--- | | **Density** | 8.17 g/cm³ | | **Melting Point** | 1450°C | | **Thermal Conductivity** | 14.5 W/m·K | | **Mean CTE (20-300°C)** | 4.5-5.5 × 10⁻⁶/°C | | **Specific Heat Capacity** | 460 J/kg·K | | **Electrical Resistivity** | 75 μΩ·cm | | **Modulus of Elasticity** | 152 GPa | | **Curie Temperature** | 230°C | --- #### **3. Mechanical Properties** | Property | Seamless Tube | Welded & Redrawn Tube | | :--- | :--- | :--- | | **Tensile Strength** | 75-90 ksi (517-621 MPa) | 70-85 ksi (483-586 MPa) | | **Yield Strength (0.2%)** | 45-60 ksi (310-414 MPa) | 40-55 ksi (276-379 MPa) | | **Elongation** | 30-40% | 25-35% | | **Hardness** | HRB 78-88 | HRB 75-85 | | **Collapse Pressure** | OD and wall dependent | OD and wall dependent | --- #### **4. Product Specifications & Applications** **Tube Specifications:** - **Types Available:** Seamless, Welded & Redrawn - **Diameter Range:** 0.010" to 4.000" OD (0.25mm to 101.6mm) - **Wall Thickness:** 0.002" to 0.125" (0.05mm to 3.18mm) - **Lengths:** Standard 12-foot, custom lengths available - **Tolerances:** ±0.0005" to ±0.005" (size dependent) **Primary Applications:** * **Semiconductor Equipment:** - Process gas delivery lines - Chemical distribution systems - Vacuum chamber components - Wafer handling system tubing * **Aerospace & Defense:** - Hydraulic system tubing - Fuel line components - Instrumentation pressure lines - Avionics cooling conduits * **Medical Devices:** - Medical instrument components - Surgical device tubing - Diagnostic equipment parts - Implantable device housings * **Scientific Research:** - Cryogenic transfer lines - Vacuum system components - Laboratory apparatus tubing - Research instrument housings **Specialized Applications:** - Optical instrument structures - Laser system components - Precision measurement devices - Thermal management systems - Ultra-high vacuum applications --- #### **5. International Standards & Specifications** **Global Standards Compliance:** - **ASTM B722:** Nickel-Iron-Chromium Alloy Seamless Tube - **ASTM B725:** Welded Nickel and Nickel-Cobalt Alloy Tube - **UNS K94670:** Unified Numbering System - **AMS 7725:** Aerospace Material Specification - **MIL-DTL-23488:** Military Specification - **ISO 4950:** High Yield Strength Steel - **DIN 17470:** German Industrial Standard **Quality Specifications:** - **Dimensional Tolerances:** ASTM A632 compliant - **Surface Finish:** 0.4-0.8 μm Ra (internal) - **Straightness:** 0.001" per foot maximum - **Concentricity:** 90% minimum wall uniformity - **Certification:** EN 10204 3.1/3.2 available --- #### **6. Technical Advantages & Processing Characteristics** **Manufacturing Excellence:** - **Precision Drawing:** Advanced cold drawing technology - **Surface Quality:** Superior internal and external finishes - **Heat Treatment:** Controlled atmosphere annealing - **Quality Control:** 100% dimensional verification **Performance Benefits:** - **Exceptional Thermal Stability:** Maintains dimensions under thermal cycling - **Excellent Corrosion Resistance:** Suitable for aggressive environments - **Good Fabricability:** Easy to bend, form, and machine - **Reliable Performance:** Proven in critical applications **Fabrication Guidelines:** - **Bending:** Minimum radius 2x tube diameter - **Welding:** Use matching filler metals - **Machining:** Excellent with proper tooling - **Cleaning:** Passivation recommended **Quality Assurance:** - **Chemical Analysis:** Complete material certification - **Mechanical Testing:** Verification of all properties - **Non-Destructive Testing:** UT, eddy current available - **Dimensional Inspection:** Precision measurement - **Surface Examination:** Microscopic inspection --- #### **Why Choose Our Alloy 39 Tube?** * **Premium Quality:** Strict control of composition and microstructure * **Precision Manufacturing:** Exceptional dimensional accuracy * **Technical Expertise:** Comprehensive application support * **Quality Assurance:** Full traceability and certification * **Global Compliance:** Meets international standards * **Proven Reliability:** Extensive performance history **Value-Added Services:** - Precision cutting to length - Custom end finishing - Special cleaning and packaging - Heat treatment processing - Comprehensive testing services **Contact our technical team** for detailed specifications and application engineering support. We provide complete solutions for your low expansion alloy tube requirements, ensuring optimal performance in your most demanding thermal management and precision engineering 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 2759 gallon liquid totes Special package is available on request.