Alloy 39，Low Expansion 39 Alloy Sheet，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 39 / Low Expansion 39 Alloy Sheet** **Precision Thin-Gauge Material for Advanced Thermal Management Applications** **Alloy 39 Sheet** is a specialized nickel-iron-cobalt alloy in sheet form, engineered to provide exceptional dimensional stability and controlled thermal expansion in thin-section applications. This advanced material maintains consistent performance across wide temperature ranges, making it ideal for electronic packaging, precision instruments, and aerospace components where thermal stability and reliability are critical requirements. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | Control Significance | | :--- | :--- | :--- | | **Nickel (Ni)** | 38.0 - 40.0 | Primary expansion control element | | **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 formability | | **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 preservation | * **Precision Formulation:** The optimized nickel-cobalt balance ensures minimal thermal expansion while maintaining excellent formability and consistent performance in thin sheet 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 | | **Curie Temperature** | 230°C | - | --- #### **3. Mechanical Properties** | Property | Annealed Condition | Hard Temper Condition | | :--- | :--- | :--- | | **Tensile Strength** | 70-85 ksi (483-586 MPa) | 95-115 ksi (655-793 MPa) | | **Yield Strength (0.2%)** | 40-55 ksi (276-379 MPa) | 85-105 ksi (586-724 MPa) | | **Elongation** | 30-40% | 10-20% | | **Hardness** | HRB 75-85 | HRB 90-100 | | **Flatness** | < 2 mm/m | < 1 mm/m | --- #### **4. Product Specifications & Applications** **Sheet Specifications:** - **Thickness Range:** 0.002" to 0.125" (0.05mm to 3.18mm) - **Width Range:** 6" to 36" (152mm to 914mm) - **Length Range:** 12" to 96" (305mm to 2438mm) - **Surface Finish:** Bright annealed, 2B, BA finishes - **Tolerance:** ±0.0001" to ±0.005" (thickness dependent) **Primary Applications:** * **Electronics & Semiconductor:** - IC package substrates and lids - Hybrid circuit bases - RF microwave packages - Power device enclosures * **Precision Instrumentation:** - Optical mounting platforms - Laser system components - Measuring equipment structures - Sensor mounting elements * **Aerospace & Defense:** - Avionics enclosure components - Satellite instrument mounts - Guidance system platforms - Radar component bases * **Medical Technology:** - Medical instrument housings - Diagnostic equipment shields - Surgical device components - Implantable device encapsulation **Specialized Applications:** - Thin-profile hermetic seals - Precision stamped components - Multi-layer assemblies - Thermal management substrates - Vibration-resistant platforms --- #### **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 Plates - **DIN 17470:** German Industrial Standard - **JIS C2531:** Japanese Industrial Standard **Quality Specifications:** - **Thickness Tolerance:** ASTM A480 compliant - **Surface Quality:** No. 1, 2B, or custom finishes - **Flatness Standards:** Commercial and precision grades - **Dimensional Stability:** Controlled through thermal processing - **Certification:** EN 10204 3.1/3.2 material certificates --- #### **6. Technical Advantages & Processing Characteristics** **Manufacturing Benefits:** - **Excellent Formability:** Superior deep drawing and bending capabilities - **Consistent Flatness:** Maintains dimensional stability during processing - **Good Weldability:** Compatible with standard welding techniques - **Thermal Stability:** Minimal dimensional change under thermal cycling - **Corrosion Resistance:** Suitable for most industrial environments **Processing Guidelines:** - **Stamping:** Excellent for high-speed precision stamping - **Photochemical Etching:** Suitable for complex geometries - **Heat Treatment:** Stress relieving recommended after severe forming - **Surface Treatment:** Compatible with various plating processes - **Cleaning:** Avoid chloride-containing solutions **Quality Assurance:** - **Chemical Analysis:** Complete material certification - **Mechanical Testing:** Verification of all specified properties - **Dimensional Inspection:** Precision measurement capabilities - **Surface Examination:** Comprehensive quality assessment - **Flatness Verification:** Laser-based measurement systems --- #### **Why Choose Our Alloy 39 Sheet?** * **Premium Quality Control:** Strict control of chemical composition and microstructure * **Precision Manufacturing:** Exceptional thickness uniformity 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:** - Precision slitting to custom widths - Custom blanking and shearing - Surface finishing treatments - Heat treatment processing - Comprehensive testing services **Contact our technical team** for detailed specifications, application engineering support, and material selection guidance. We provide complete solutions for your low expansion alloy sheet requirements, ensuring optimal performance in your most demanding precision engineering and thermal management 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 2761 gallon liquid totes Special package is available on request.