Alloy 39，Low Expansion 39 Alloy Plate，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 39 / Low Expansion 39 Alloy Plate** **Premium Plate Stock for Precision Engineering and Thermal Stability Applications** **Alloy 39 Plate** is a specialized nickel-iron-cobalt alloy plate engineered to provide exceptional dimensional stability and controlled thermal expansion in structural applications. This advanced material offers an optimal combination of low thermal expansion characteristics, excellent mechanical properties, and superior machinability, making it ideal for precision instruments, optical systems, and semiconductor equipment where thermal stability is critical. --- #### **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 | * **Precision Engineering:** The optimized nickel-cobalt balance ensures consistent low thermal expansion characteristics, while stringent impurity control guarantees superior flatness stability and machining performance. --- #### **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 | Annealed Condition | Stress-Relieved Condition | | :--- | :--- | :--- | | **Tensile Strength** | 70-85 ksi (483-586 MPa) | 75-90 ksi (517-621 MPa) | | **Yield Strength (0.2%)** | 40-55 ksi (276-379 MPa) | 45-60 ksi (310-414 MPa) | | **Elongation** | 30-40% | 25-35% | | **Hardness** | HRB 75-85 | HRB 80-90 | | **Flatness Tolerance** | 0.010" per inch | 0.005" per inch | --- #### **4. Product Specifications & Applications** **Plate Specifications:** - **Thickness Range:** 0.010" to 4.000" (0.25mm to 101.6mm) - **Width Range:** 12" to 48" (304.8mm to 1219.2mm) - **Length Range:** 24" to 144" (609.6mm to 3657.6mm) - **Surface Finish:** 2B, No. 1, or customized finishes - **Flatness:** Commercial or precision grades available **Primary Applications:** * **Precision Instrumentation:** - Optical mounting platforms - Laser system base plates - Coordinate measuring machine tables - Metrology equipment structures * **Semiconductor Manufacturing:** - Wafer stage components - Lithography equipment bases - Vacuum chamber platforms - Inspection system mounting plates * **Aerospace & Defense:** - Inertial navigation system mounts - Satellite optical benches - Radar system structural components - Avionics equipment platforms * **Scientific Research:** - Telescope mounting plates - Interferometer bases - Laboratory standard platforms - Cryogenic equipment structures **Specialized Applications:** - Composite tooling plates - Precision fixture bases - Optical table substrates - Thermal management platforms - Vibration isolation bases --- #### **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:** ±0.001" to ±0.015" - **Flatness Standards:** ASTM A480 compliant - **Surface Quality:** No. 1 finish standard - **Dimensional Stability:** Controlled through stress relieving - **Certification:** EN 10204 3.1/3.2 available --- #### **6. Technical Advantages & Processing Characteristics** **Manufacturing Benefits:** - **Exceptional Flatness:** Maintains dimensional stability under thermal cycling - **Superior Machinability:** Excellent chip formation and surface finish - **Good Weldability:** Compatible with standard welding techniques - **Thermal Stability:** Minimal dimensional change across temperature ranges - **Corrosion Resistance:** Suitable for most industrial environments **Processing Guidelines:** - **Machining:** Use sharp tools with positive rake angles - **Heat Treatment:** Stress relieve at 425-540°C after heavy machining - **Surface Grinding:** Suitable for precision surface finishing - **Forming:** Good cold working characteristics in annealed condition - **Cleaning:** Avoid chloride-containing solutions **Quality Assurance:** - **Chemical Analysis:** Complete material certification - **Mechanical Testing:** Verification of all specified properties - **Flatness Verification:** Precision measurement capabilities - **Surface Inspection:** Comprehensive quality examination - **Traceability:** Full material history documentation --- #### **Why Choose Our Alloy 39 Plate?** * **Premium Quality:** Strict control of chemical composition and microstructure * **Precision Manufacturing:** Excellent flatness and dimensional accuracy * **Technical Expertise:** Comprehensive application support and guidance * **Quality Assurance:** Full certification and traceability * **Global Compliance:** Meets international standards and specifications * **Proven Reliability:** Extensive track record in critical applications **Value-Added Services:** - Precision cutting to size - Surface grinding and finishing - Stress relief annealing - Custom machining services - 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 plate 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 2760 gallon liquid totes Special package is available on request.