Invar 36,Super Invar 32-5 Sheet,UNS K93603,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 Sheet (UNS K93603) - Technical Product Introduction** --- ### **Overview** **Super Invar 32-5 Sheet** (UNS K93603) represents the sheet form of the advanced iron-nickel-cobalt alloy, offering the lowest coefficient of thermal expansion among commercially available metal alloys in thin-sheet configuration. This product combines exceptional dimensional stability with excellent formability, making it ideal for precision applications where minimal thermal expansion is critical in thin-section components. --- ### **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 | --- ### **3. Mechanical Properties** | Condition | Tensile Strength | Yield Strength | Elongation | Hardness | |-----------|------------------|----------------|------------|----------| | **Annealed** | 470-540 MPa | 270-340 MPa | 25-35% | 70-80 HRB | | **¼ Hard** | 550-620 MPa | 480-550 MPa | 15-25% | 85-95 HRB | | **½ Hard** | 620-690 MPa | 550-620 MPa | 8-15% | 95-100 HRB | --- ### **4. Product Specifications** **Thickness Range:** - **Standard Sheet:** 0.5 mm to 6.0 mm - **Precision Tolerance:** ±0.02 mm to ±0.05 mm - **Special Thickness:** Available upon request **Standard Sizes:** - **Width:** 600 mm to 1500 mm - **Length:** 1200 mm to 3000 mm - **Custom Dimensions:** Available per requirements **Surface Conditions:** - **Cold Rolled:** Standard mill finish - **Annealed & Pickled:** Clean, scale-free surface - **Polished:** Special surface finishes available --- ### **5. Product Applications** **Ultra-Precision Electronics:** - **Semiconductor Lead Frames:** High-stability packaging components - **Microwave Circuit Bases:** Stable substrates for RF applications - **Sensor Diaphragms:** Precision sensing elements - **Optical Mounting Plates:** Thin, stable mounting surfaces **Aerospace & Defense:** - **Satellite Components:** Thin structural elements and shields - **Avionics Mounting Plates:** Stable platforms for electronic systems - **Optical System Components:** Precision alignment shims and mounts - **Thermal Management:** Heat spreader applications **Scientific Research:** - **Laboratory Instrumentation:** Precision reference surfaces - **Optical Experiment Platforms:** Stable mounting sheets - **Cryogenic Apparatus:** Low-temperature structural components - **Measurement Standards:** Reference sheet materials **Specialized Industrial:** - **Laser System Components:** Optical mounting and alignment - **Metrology Equipment:** Precision reference surfaces - **Composite Tooling:** Stable mold surfaces - **Precision Mechanisms:** Thin structural elements --- ### **6. International Standards** | Standard Body | Standard Number | Description | |---------------|-----------------|-------------| | **ASTM** | ASTM F1684-06 | Standard Specification for Sheet | | **UNS** | K93603 | Unified Numbering System | | **AMS** | AMS 7726 | Aerospace Material Specification | | **JIS** | JIS NCF 3 | Japanese Industrial Standard | | **GB** | GB 4J32 | Chinese National Standard | --- ### **7. Fabrication Characteristics** **Forming & Stamping:** - **Minimum Bend Radius:** 1t (material thickness) - **Punch Clearance:** 5-8% of material thickness - **Deep Drawing:** Excellent in annealed condition - **Springback:** Predictable and consistent **Welding & Joining:** - **Preferred Process:** GTAW (TIG) welding - **Filler Metal:** AWS A5.14 ERNiFeCr-3 - **Brazing:** Compatible with silver-based alloys - **Adhesive Bonding:** Good surface compatibility **Heat Treatment:** - **Solution Annealing:** 830-850°C, rapid cool - **Stabilization:** 315-370°C for 1-2 hours - **Stress Relieving:** 425-480°C after forming - **Atmosphere Control:** Hydrogen or vacuum recommended --- ### **8. Quality Assurance** **Testing Requirements:** - **CTE Verification:** Dilatometer testing per ASTM E228 - **Surface Quality:** Microscopic inspection - **Flatness Testing:** Laser-based measurement - **Dimensional Verification:** Statistical process control **Certification:** - **Material Traceability:** Full manufacturing history - **Heat Treatment Records:** Complete thermal cycle documentation - **CTE Certification:** Batch-specific test data - **Third-Party Verification:** For critical applications --- ### **9. Design Considerations** **Thermal Performance:** - CTE approximately 3× lower than standard Invar 36 - Optimal stability in room temperature range - Requires thermal conditioning for maximum performance - Minimal dimensional change during thermal cycling **Mechanical Design:** - Higher strength than standard Invar sheets - Excellent fatigue resistance in thin sections - Good formability in annealed condition - Suitable for high-vacuum applications **Application Guidelines:** - **Storage:** Proper conditions to prevent deformation - **Handling:** Care required to prevent surface damage - **Cleaning:** Suitable for standard cleaning methods - **Protection:** Corrosion protection in harsh environments --- ### **Conclusion** Super Invar 32-5 Sheet (UNS K93603) offers unparalleled thermal stability in sheet form, providing engineers with a material solution for the most demanding precision applications. Its exceptionally low coefficient of thermal expansion, combined with excellent manufacturing characteristics, makes it indispensable for applications in aerospace, semiconductor manufacturing, and scientific research where dimensional stability in thin sections is critical. While requiring careful processing and quality control, the material's superior performance justifies its use in applications where conventional materials cannot meet thermal stability requirements. Proper selection of temper condition and adherence to recommended fabrication practices are essential for achieving optimal performance in final components.

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 2423 gallon liquid totes Special package is available on request.