Invar 36,Super Invar 32-5 Other/Similar Specs,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 & Related Specifications (UNS K93603) - Comprehensive Technical Introduction** --- ### **Overview** **Super Invar 32-5** (UNS K93603) represents the premium grade of controlled expansion alloys, offering the lowest coefficient of thermal expansion among commercially available iron-nickel-cobalt alloys. This material finds application in ultra-precision industries where dimensional stability under thermal variations is critical. --- ### **1. Chemical Composition (%)** | Element | Standard Range | Precision Grade | |---------|----------------|-----------------| | **Nickel (Ni)** | 31.5-33.0 | 32.0-32.5 | | **Cobalt (Co)** | 4.5-5.5 | 5.0-5.2 | | **Iron (Fe)** | Balance | Balance | | **Carbon (C)** | ≤0.05 | ≤0.02 | | **Manganese (Mn)** | ≤0.50 | ≤0.25 | | **Silicon (Si)** | ≤0.20 | ≤0.10 | | **Phosphorus (P)** | ≤0.015 | ≤0.010 | | **Sulfur (S)** | ≤0.015 | ≤0.008 | | **Chromium (Cr)** | ≤0.15 | ≤0.08 | | **Aluminum (Al)** | ≤0.10 | ≤0.05 | --- ### **2. Physical Properties** | Property | Standard Value | Precision Grade | |----------|----------------|-----------------| | **Density** | 8.10 g/cm³ | 8.10 g/cm³ | | **Melting Point** | 1430°C | 1430°C | | **CTE (20-100°C)** | **0.5-0.8 × 10⁻⁶/°C** | **0.3-0.6 × 10⁻⁶/°C** | | **Thermal Conductivity** | 10.0 W/m·K | 10.0 W/m·K | | **Modulus of Elasticity** | 147 GPa | 147 GPa | | **Curie Temperature** | 250°C | 250°C | --- ### **3. Related Specifications & Equivalents** **International Designations:** - **UNS:** K93603 - **ASTM:** F1684-06 - **AMS:** 7726 - **JIS:** NCF 3 (JIS G 4902) - **GB:** 4J32 (China) - **DIN:** 2.3360 (Germany) - **NF:** F-30 (France) **Proprietary Grades:** - **Vacuum Melt Grades:** Enhanced purity for critical applications - **Low Magnetic Grades:** Reduced magnetic permeability - **Stabilized Grades:** Optimized for specific temperature ranges --- ### **4. Mechanical Properties Comparison** | Property | Super Invar 32-5 | Standard Invar 36 | |----------|------------------|-------------------| | **Tensile Strength** | 480-550 MPa | 450-520 MPa | | **Yield Strength** | 280-350 MPa | 250-310 MPa | | **Elongation** | 25-35% | 30-40% | | **CTE (20-100°C)** | **0.5-0.8 × 10⁻⁶/°C** | **1.6 × 10⁻⁶/°C** | | **Density** | 8.10 g/cm³ | 8.13 g/cm³ | --- ### **5. Specialized Product Forms** **Advanced Manufacturing Forms:** - **Powder Metallurgy Parts:** For complex net-shape components - **Metal Injection Molded Parts:** High-volume precision components - **Additive Manufacturing:** Special wire and powder forms - **Clad Materials:** Composite structures with other alloys **Special Processing Variants:** - **Double Vacuum Melted:** Ultra-high purity - **Electroslag Remelted:** Improved cleanliness - **Precision Rolled:** Ultra-thin foils (down to 0.01mm) - **Single Crystal:** Specialized research applications --- ### **6. Enhanced Applications** **Quantum Technology:** - **Quantum Computer Components:** Stable mounting structures - **Atomic Clock Platforms:** Precision reference surfaces - **Qubit Mounting Systems:** Ultra-stable cryogenic components **Advanced Optics:** - **EUV Lithography:** Mirror mounts and structural elements - **Space Telescopes:** Primary and secondary mirror supports - **Laser Interferometry:** Reference arms and base plates **Fundamental Research:** - **Gravitational Wave Detection:** Test mass suspension systems - **Dark Matter Experiments:** Ultra-stable apparatus - **Precision Measurement:** Reference standards and bases --- ### **7. International Standards Compliance** **Testing Standards:** - **CTE Measurement:** ASTM E228, ISO 11359-2 - **Ultrasonic Testing:** ASTM A388, EN 10160 - **Chemical Analysis:** ASTM E1473, ISO 18114 - **Mechanical Testing:** ASTM E8/E8M, ISO 6892-1 **Quality Standards:** - **Aerospace:** AS9100, NADCAP - **Nuclear:** NQA-1, 10CFR50 - **Medical:** ISO 13485 - **General:** ISO 9001 --- ### **8. Special Processing Requirements** **Enhanced Heat Treatment:** - **Multi-Stage Stabilization:** Complex thermal cycling - **Cryogenic Treatment:** Enhanced dimensional stability - **Controlled Atmosphere:** Hydrogen or vacuum essential - **Precision Quenching:** Critical cooling rate control **Advanced Manufacturing:** - **Precision Machining:** Sub-micron tolerance capability - **Special Welding:** Electron beam and laser welding - **Surface Enhancement:** Super-polishing and coating - **Clean Room Processing:** For high-purity applications --- ### **9. Technical Considerations** **Performance Limitations:** - **Temperature Range:** Optimal performance 15-35°C - **Magnetic Properties:** Ferromagnetic below Curie point - **Corrosion Resistance:** Limited, requires protection - **Cost Factors:** Significantly higher than standard Invar **Design Advantages:** - **Thermal Stability:** 3× better than standard Invar - **Long-Term Stability:** Excellent aging characteristics - **Manufacturability:** Good machining and forming properties - **Reliability:** Proven performance in critical applications --- ### **Conclusion** Super Invar 32-5 (UNS K93603) and its related specifications represent the ultimate in thermal stability for precision engineering applications. With a coefficient of thermal expansion approximately three times lower than standard Invar 36, this advanced alloy enables technological breakthroughs in fields ranging from space exploration to quantum computing. The comprehensive range of international standards and specialized variants ensures that engineers can select the appropriate specification for even the most demanding applications. While requiring sophisticated processing and strict quality controls, the material's unparalleled thermal performance justifies its use in applications where dimensional stability at the nanometer level is essential. Continuous development and refinement of Super Invar alloys maintain their position as critical enabling materials for advancing technology and scientific research.

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 2427 gallon liquid totes Special package is available on request.