Alloy 39，Low Expansion 39 Alloy Wire，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 39 / Low Expansion 39 Alloy Wire** **Precision-Drawn Wire for Critical Thermal Management Applications** **Alloy 39 Wire** is a premium nickel-iron-cobalt alloy wire specifically engineered for applications requiring exceptional dimensional stability and controlled thermal expansion. This precision-drawn wire maintains the superior thermal characteristics of Alloy 39 while offering excellent formability and consistent mechanical properties, making it ideal for electronic components, precision instruments, and aerospace applications where thermal stability is paramount. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | Control Significance | | :--- | :--- | :--- | | **Nickel (Ni)** | 38.0 - 40.0 | Primary expansion control | | **Cobalt (Co)** | 14.0 - 16.0 | Secondary expansion adjustment | | **Iron (Fe)** | Balance | Matrix formation | | **Manganese (Mn)** | 0.50 max | Deoxidation control | | **Silicon (Si)** | 0.30 max | Surface quality | | **Carbon (C)** | 0.05 max | Formability | | **Chromium (Cr)** | 0.20 max | Surface stability | | **Aluminum (Al)** | 0.10 max | Deoxidation | | **Copper (Cu)** | 0.20 max | Minor alloying element | * **Precision Formulation:** The optimized nickel-cobalt balance ensures consistent low thermal expansion characteristics, while stringent impurity control guarantees superior drawing performance and wire quality. --- #### **2. Physical Properties** | Property | Value | Condition | | :--- | :--- | :--- | | **Density** | 8.17 g/cm³ | 20°C | | **Melting Point** | 1450°C | - | | **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 | | **Curie Temperature** | 230°C | - | | **Modulus of Elasticity** | 152 GPa | 20°C | --- #### **3. Mechanical Properties** | Property | Annealed Condition | Hard Drawn Condition | | :--- | :--- | :--- | | **Tensile Strength** | 70-85 ksi (483-586 MPa) | 100-130 ksi (690-896 MPa) | | **Yield Strength (0.2%)** | 40-55 ksi (276-379 MPa) | 90-115 ksi (621-793 MPa) | | **Elongation** | 35-45% | 10-20% | | **Reduction of Area** | 60-70% | 40-50% | | **Hardness** | HV 140-160 | HV 220-260 | --- #### **4. Product Specifications & Applications** **Wire Specifications:** - **Diameter Range:** 0.005" to 0.250" (0.127 mm to 6.35 mm) - **Diameter Tolerance:** ±0.0001" to ±0.001" - **Spool Sizes:** 5 lb to 50 lb (2.3 kg to 22.7 kg) standard - **Surface Finish:** Bright, cleaned, or specially coated - **Temper Conditions:** Annealed, 1/4 Hard, 1/2 Hard, Full Hard **Primary Applications:** * **Electronics & Semiconductor:** - IC lead frames and connector pins - Hybrid circuit bonding wires - Semiconductor package leads - Microwave component leads * **Precision Instruments:** - Spring contacts and connectors - Instrument component wires - Measuring device elements - Optical alignment wires * **Aerospace & Defense:** - Avionics component leads - Sensor wiring elements - Guidance system components - Satellite electronic parts * **Medical Devices:** - Medical instrument components - Surgical device wires - Implantable device elements - Diagnostic equipment parts **Specialized Applications:** - Precision spring components - Welding electrode cores - Thermal management elements - Vacuum tube components - Research apparatus parts --- #### **5. International Standards & Specifications** **Global Standards Compliance:** - **ASTM F30:** Standard Specification for Iron-Nickel-Cobalt Alloys - **UNS K94670:** Unified Numbering System Designation - **AMS 7725:** Aerospace Material Specification - **MIL-DTL-23488:** Military Specification - **ISO 4950:** High Yield Strength Steel - **DIN 17470:** German Industrial Standard - **JIS C2531:** Japanese Industrial Standard **Quality Specifications:** - **Diameter Tolerance:** ±0.0001" to ±0.001" - **Surface Quality:** Free of seams and defects - **Spooling Quality:** Uniform winding without tangles - **Certification:** EN 10204 3.1/3.2 with full traceability - **Testing:** Comprehensive mechanical and physical testing --- #### **6. Technical Advantages & Processing Characteristics** **Manufacturing Excellence:** - **Precision Drawing:** Advanced multi-stage cold drawing process - **Heat Treatment:** Controlled atmosphere annealing - **Surface Preparation:** Advanced cleaning and finishing - **Quality Control:** 100% dimensional verification **Performance Benefits:** - **Exceptional Thermal Stability:** Maintains dimensions under thermal cycling - **Excellent Formability:** Suitable for complex bending and forming - **Consistent Properties:** Uniform mechanical characteristics - **Good Weldability:** Compatible with standard welding techniques **Processing Guidelines:** - **Wire Forming:** Excellent for automatic forming operations - **Machining:** Good machinability with proper techniques - **Heat Treatment:** Stress relieving recommended after severe forming - **Surface Treatment:** Compatible with various plating processes **Quality Assurance:** - **Chemical Analysis:** Complete material certification - **Mechanical Testing:** Verification of all specified properties - **Dimensional Inspection:** Precision measurement capabilities - **Surface Examination:** Comprehensive quality assessment - **Performance Testing:** Application-specific testing available --- #### **Why Choose Our Alloy 39 Wire?** * **Premium Quality:** Strict control of chemical composition and microstructure * **Precision Manufacturing:** Exceptional diameter control and surface quality * **Technical Expertise:** Comprehensive application support and guidance * **Quality Assurance:** Full traceability with certified documentation * **Global Compliance:** Meets international standards and specifications * **Proven Reliability:** Extensive track record in critical applications **Value-Added Services:** - Custom spooling and packaging - Special surface treatments - Precision cutting to length - 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 wire 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 2767 gallon liquid totes Special package is available on request.