Alloy 39，Low Expansion 39 Alloy Pipe，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 39 / Low Expansion 39 Alloy Pipe** **Precision Tubing for Advanced Thermal Management Applications** **Alloy 39 Pipe** is a specialized iron-nickel-cobalt alloy tubing engineered to provide exceptional dimensional stability and controlled thermal expansion in piping applications. This advanced material maintains consistent performance across wide temperature ranges, making it ideal for critical applications in aerospace, semiconductor manufacturing, and precision instrumentation where thermal stability and reliability are paramount. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | Control Significance | | :--- | :--- | :--- | | **Nickel (Ni)** | 38.0 - 40.0 | Primary thermal expansion control | | **Cobalt (Co)** | 14.0 - 16.0 | Secondary expansion adjustment | | **Iron (Fe)** | Balance | Matrix structure formation | | **Manganese (Mn)** | 0.50 max | Deoxidation and sulfur control | | **Silicon (Si)** | 0.30 max | Deoxidation agent | | **Carbon (C)** | 0.05 max | Weldability and corrosion resistance | | **Chromium (Cr)** | 0.20 max | Surface stability | | **Aluminum (Al)** | 0.10 max | Deoxidation element | | **Copper (Cu)** | 0.20 max | Minor alloying element | | **Titanium (Ti)** | 0.10 max | Grain refinement | | **Sulfur (S)** | 0.015 max | Hot workability control | | **Phosphorus (P)** | 0.015 max | Ductility and toughness | * **Optimized Formula:** The precise balance of nickel and cobalt ensures minimal thermal expansion while maintaining excellent mechanical properties and corrosion resistance in piping applications. --- #### **2. Physical Properties** | Property | Value | Test Condition | | :--- | :--- | :--- | | **Density** | 8.17 g/cm³ | 20°C | | **Melting Point** | 1450°C | Approximate | | **Thermal Conductivity** | 14.5 W/m·K | 20°C | | **Mean CTE (20-300°C)** | 4.5-5.5 × 10⁻⁶/°C | - | | **Specific Heat Capacity** | 460 J/kg·K | 20°C | | **Electrical Resistivity** | 75 μΩ·cm | 20°C | | **Modulus of Elasticity** | 152 GPa | 20°C | | **Thermal Shock Resistance** | Excellent | - | --- #### **3. Mechanical Properties** | Property | Seamless Pipe (Annealed) | Welded Pipe (Annealed) | | :--- | :--- | :--- | | **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 | | **Burst Pressure** | Schedule dependent | Schedule dependent | --- #### **4. Product Specifications & Applications** **Pipe Configurations:** - **Seamless Pipe:** Maximum integrity for high-pressure applications - **Welded Pipe:** Cost-effective solution for standard applications - **Size Range:** 1/8" to 8" NB (6mm to 200mm) - **Wall Thickness:** Schedule 5S to Schedule 80 - **Lengths:** Standard random lengths, custom cut lengths available **Primary Applications:** * **Semiconductor Industry:** - Ultra-pure chemical delivery systems - Process gas distribution lines - Vacuum chamber components - Etching and deposition equipment * **Aerospace & Defense:** - Hydraulic system components - Fuel management systems - Environmental control systems - Avionics cooling circuits * **Precision Instrumentation:** - Laser cooling systems - Optical instrument plumbing - Laboratory analysis equipment - Cryogenic transfer lines * **Energy Sector:** - Solar panel manufacturing - Fuel cell components - Nuclear instrumentation - Thermal management systems **Specialized Pipe Applications:** - Thermal compensation loops - Precision fluid handling systems - Vacuum and pressure vessels - Chemical processing equipment - Research and development apparatus --- #### **5. International Standards & Specifications** **Global Standards Compliance:** - **ASTM B722:** Standard Specification for Nickel-Iron-Chromium Alloy Seamless Pipe - **ASTM B725:** Standard Specification for Welded Nickel and Nickel-Cobalt Alloy Pipe - **UNS K94670:** Unified Numbering System Designation - **AMS 7725:** Aerospace Material Specification - **MIL-DTL-23488:** Military Specification - **ISO 4950:** High Yield Strength Steel Plates - **DIN 17470:** German Industrial Standard **Pipe Specifications:** - **Size Standards:** ASME B36.10M, B36.19M - **Pressure Ratings:** ASME B31.3 compliant - **Tolerances:** ASTM A999/A999M - **Surface Finish:** 0.8 μm Ra maximum (internal) - **End Preparation:** Plain, beveled, or threaded ends --- #### **6. Technical Advantages & Processing Characteristics** **Manufacturing Benefits:** - **Excellent Thermal Stability:** Maintains dimensional integrity under thermal cycling - **Superior Corrosion Resistance:** Suitable for aggressive chemical environments - **Good Weldability:** Compatible with standard welding techniques - **Easy Fabrication:** Suitable for bending and forming operations - **Long Service Life:** Maintains properties in extreme conditions **Fabrication Guidelines:** - **Welding:** Use matching filler metals for optimal performance - **Bending:** Minimum bend radius 3x pipe diameter - **Machining:** Excellent machinability with proper tooling - **Cleaning:** Passivation recommended for corrosion resistance - **Testing:** Hydrostatic and pneumatic testing capabilities **Quality Assurance:** - **Chemical Analysis:** Complete material certification - **Non-Destructive Testing:** UT, RT, MT, PT as required - **Dimensional Verification:** Full compliance with specifications - **Surface Inspection:** Internal and external surface quality - **Pressure Testing:** Hydrostatic and pneumatic tests available --- #### **Why Choose Our Alloy 39 Pipe?** * **Premium Quality:** Strict control of chemical composition and microstructure * **Precision Manufacturing:** Excellent dimensional accuracy and surface quality * **Technical Expertise:** Comprehensive application support and guidance * **Quality Assurance:** Full certification and traceability * **Global Compliance:** Meets international standards and specifications * **Proven Performance:** Extensive track record in critical applications **Value-Added Services:** - Custom cutting and machining - End preparation and threading - Heat treatment processing - Non-destructive testing - Comprehensive certification packages **Contact our technical team** for detailed specifications, application engineering support, and material selection guidance. We provide complete solutions for your low expansion alloy pipe 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 2758 gallon liquid totes Special package is available on request.