Invar 36,Super Invar 32-5 ,UNS K93050,E FORU

British Specs:，American Specs: ASTM F1684 MIL-S-16598 Tooling plate ASTM B388 Sheet & strip ASTM B753 K93050 Free-cut Invar，German Specs:WS 1.3912

**Super Invar 32-5 (UNS K93050) - Technical Product Introduction** --- ### **Overview** **Super Invar 32-5** (UNS K93050) is an advanced iron-nickel-cobalt controlled expansion alloy that exhibits an exceptionally low coefficient of thermal expansion (CTE) - approximately one-third that of standard Invar 36. This enhanced thermal stability makes it the preferred choice for ultra-precision applications where minimal dimensional change with temperature variation is critical. --- ### **1. Chemical Composition (%)** | Element | Content | |---------|---------| | **Nickel (Ni)** | 31.5-33.0 | | **Cobalt (Co)** | 4.5-5.5 | | **Iron (Fe)** | Balance | | **Carbon (C)** | ≤0.05 | | **Manganese (Mn)** | ≤0.50 | | **Silicon (Si)** | ≤0.20 | | **Phosphorus (P)** | ≤0.015 | | **Sulfur (S)** | ≤0.015 | | **Chromium (Cr)** | ≤0.15 | | **Aluminum (Al)** | ≤0.10 | --- ### **2. Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.10 g/cm³ | | **Melting Point** | 1430°C | | **Coefficient of Thermal Expansion** | **0.5-0.8 × 10⁻⁶/°C** (20-100°C) | | **Thermal Conductivity** | 10.0 W/m·K | | **Specific Heat Capacity** | 500 J/kg·K | | **Modulus of Elasticity** | 147 GPa | | **Electrical Resistivity** | 0.80 μΩ·m | | **Curie Temperature** | 250°C | --- ### **3. Mechanical Properties (Annealed Condition)** | Property | Value | |----------|-------| | **Tensile Strength** | 480-550 MPa | | **Yield Strength (0.2% Offset)** | 280-350 MPa | | **Elongation** | 25-35% | | **Reduction of Area** | 50-60% | | **Hardness** | 75-85 HRB | --- ### **4. Product Applications** **Ultra-Precision Instrumentation:** - **Laser Interferometer Components:** Reference arms and mounting structures - **Atomic Clock Components:** Stable frequency reference cavities - **Metrology Equipment:** Primary length standards and gauge blocks - **Optical Reference Frames:** Ultra-stable optical tables and mounts **Aerospace & Defense:** - **Space Telescope Structures:** Primary mirror mounts and optical benches - **Satellite Guidance Systems:** Inertial measurement unit components - **High-Resolution Imaging Systems:** Stable platforms for cameras and sensors - **Radar System Bases:** Precision mounting surfaces for antenna arrays **Semiconductor Manufacturing:** - **Lithography Equipment:** Reticle stages and wafer chucks - **EUVL Systems:** Extreme ultraviolet lithography components - **Wafer Inspection Equipment:** Precision staging and mounting - **Mask Alignment Systems:** Critical positioning components **Scientific Research:** - **Gravitational Wave Detectors:** Stable optical component mounts - **Synchrotron Radiation Equipment:** Beam line components - **Cryogenic Research:** Ultra-stable supports at low temperatures - **Fundamental Physics Experiments:** Precision measurement apparatus --- ### **5. International Standards** | Standard Body | Standard Number | Description | |---------------|-----------------|-------------| | **ASTM** | ASTM F1684-06 | Standard Specification for Super Invar | | **UNS** | K93050 | Unified Numbering System | | **AMS** | AMS 7726 | Aerospace Material Specification | | **JIS** | JIS NCF 3 | Japanese Industrial Standard | | **GB** | GB 4J32 | Chinese National Standard | --- ### **6. Special Characteristics** **Enhanced Thermal Stability:** - CTE approximately 3× lower than standard Invar 36 - Minimal hysteresis in thermal cycling - Excellent long-term dimensional stability - Stable performance from cryogenic to elevated temperatures **Mechanical Properties:** - Higher strength-to-weight ratio than standard Invar - Good fatigue resistance - Excellent creep resistance at room temperature - Maintains properties in vacuum environments **Processing Considerations:** - Requires precise heat treatment control - Sensitive to cooling rates after annealing - Special handling required to maintain properties - Machining similar to standard Invar but with tighter controls --- ### **7. Heat Treatment Requirements** **Solution Treatment:** - Temperature: 830-850°C - Atmosphere: Hydrogen or vacuum recommended - Cooling: Rapid cooling to room temperature **Stabilization Treatment:** - Temperature: 315-370°C - Duration: 2-4 hours per inch of thickness - Cooling: Controlled slow cooling **Aging Characteristics:** - Sensitive to precipitation phenomena - Requires careful temperature control - Properties stabilize after proper aging --- ### **8. Quality Assurance & Testing** **Mandatory Testing:** - **CTE Verification:** Dilatometer testing per ASTM E228 - **Ultrasonic Inspection:** For internal quality assessment - **Metallographic Examination:** Grain structure evaluation - **Chemical Analysis:** Precise composition verification **Certification Requirements:** - **Enhanced Traceability:** Full manufacturing history - **Special Heat Treatment Records:** Complete thermal cycle documentation - **CTE Certification:** Actual test data for each lot - **Third-Party Verification:** Often required for critical applications --- ### **9. Design Considerations** **Thermal Performance:** - Optimal CTE performance around room temperature - CTE increases above 100°C and below 0°C - Sensitive to thermal shock conditions - Requires thermal conditioning for best stability **Application Limitations:** - Not recommended for high-temperature service (>200°C) - Magnetic properties similar to standard Invar - Requires protection in corrosive environments - Higher cost than standard Invar alloys --- ### **Conclusion** Super Invar 32-5 (UNS K93050) represents the pinnacle of low expansion metal alloys, offering unparalleled thermal stability for the most demanding precision applications. Its exceptional CTE characteristics, approximately three times lower than standard Invar 36, make it indispensable in advanced metrology, space technology, and semiconductor manufacturing. However, this enhanced performance comes with increased sensitivity to processing conditions and requires strict quality control throughout manufacturing. The material's superior stability justifies its use in applications where even nanometer-level dimensional changes are unacceptable, making it a critical enabling material for cutting-edge technologies in science and industry.

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 2430 gallon liquid totes Special package is available on request.