Alloy 39，Low Expansion 39 Alloy Strip，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 39 / Low Expansion 39 Alloy Strip** **Precision Cold-Rolled Strip for Advanced Electronic and Instrumentation Applications** **Alloy 39 Strip** is a precision cold-rolled nickel-iron-cobalt alloy specifically engineered for applications requiring exceptional dimensional stability, controlled thermal expansion, and consistent mechanical properties in thin-gauge form. This advanced material combines the superior thermal characteristics of Alloy 39 with the precise dimensional control needed for high-volume manufacturing of electronic components, precision instruments, and micro-mechanical devices. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | Control Purpose | | :--- | :--- | :--- | | **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 | Formability and weldability | | **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 Alloy Design:** The optimized nickel-cobalt balance ensures consistent low thermal expansion characteristics, while tight impurity control guarantees superior rolling performance and dimensional stability in strip form. --- #### **2. Physical Properties** | Property | Value | 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 (Soft) | 1/4 Hard | 1/2 Hard | Full Hard | | :--- | :--- | :--- | :--- | :--- | | **Tensile Strength (ksi)** | 70-80 | 80-95 | 95-115 | 115-135 | | **Yield Strength (ksi)** | 40-50 | 60-75 | 80-95 | 100-120 | | **Elongation (%)** | 35-45 | 25-35 | 15-25 | 5-15 | | **Hardness (HRB)** | 75-82 | 82-88 | 88-95 | 95-102 | | **Vickers Hardness (HV)** | 140-160 | 160-190 | 190-230 | 230-270 | --- #### **4. Product Specifications & Applications** **Strip Specifications:** - **Thickness Range:** 0.001" to 0.060" (0.025mm to 1.52mm) - **Width Range:** 0.125" to 12" (3.17mm to 304.8mm) - **Coil Weight:** 100 lbs to 2000 lbs (45 kg to 900 kg) - **Tolerance:** ±0.0001" thickness, ±0.002" width - **Edge Condition:** Slit edge, round edge, or custom profiles **Primary Applications:** * **Electronic Components:** - IC lead frames and terminals - Semiconductor package components - Connector pins and contacts - Hybrid circuit substrates * **Precision Instruments:** - Spring contacts and connectors - Miniature relay components - Sensor elements - Measuring device components * **Aerospace & Defense:** - Avionics component leads - Guidance system parts - Satellite electronic components - Military connector elements * **Medical Devices:** - Medical instrument components - Surgical device parts - Diagnostic equipment elements - Implantable device substrates **Specialized Strip Applications:** - High-speed stamped sealing components - Precision etched circuit elements - Multi-slide formed parts - Progressive die stamped assemblies - Fine blanked sealing surfaces --- #### **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:** - **Dimensional Standards:** ASTM A480 compliant - **Tolerance Grades:** Precision and Ultra-Precision available - **Surface Quality:** No. 1, 2B, BA, or custom finishes - **Flatness Standards:** Standard, Precision, or Ultra-Flat - **Certification:** EN 10204 3.1/3.2 with full traceability --- #### **6. Technical Advantages & Processing Characteristics** **Manufacturing Benefits:** - **Excellent Formability:** Superior deep drawing and bending capabilities - **Consistent Properties:** Uniform mechanical characteristics throughout coils - **Thermal Stability:** Maintains dimensional integrity under thermal cycling - **Good Weldability:** Compatible with standard welding techniques - **Corrosion Resistance:** Suitable for most industrial environments **Processing Guidelines:** - **Stamping:** Excellent for high-speed precision stamping operations - **Photochemical Etching:** Suitable for complex micro-patterns - **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 Strip?** * **Premium Quality Control:** Strict control of chemical composition and microstructure * **Precision Manufacturing:** Exceptional thickness control and dimensional accuracy * **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 temper development - Special surface treatments - Protective packaging solutions - Just-in-time delivery programs **Contact our technical team** for detailed specifications, application engineering support, and material selection guidance. We provide complete solutions for your low expansion alloy strip requirements, ensuring optimal performance in your most demanding precision engineering and electronic 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 2762 gallon liquid totes Special package is available on request.