Invar 36,Super Invar 32-5 Fittings,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 Fittings (UNS K93603) - Technical Product Introduction** --- ### **Overview** **Super Invar 32-5 Fittings** (UNS K93603) represent precision-engineered connection components manufactured from the advanced iron-nickel-cobalt alloy with the lowest commercially available coefficient of thermal expansion. These fittings are specifically designed for critical piping and tubing systems where exceptional dimensional stability under thermal cycling is paramount, ensuring reliable performance in ultra-precision applications. --- ### **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 (Annealed Condition)** | Property | Value | |----------|-------| | **Tensile Strength** | 480-550 MPa | | **Yield Strength (0.2% Offset)** | 280-350 MPa | | **Elongation** | 25-35% | | **Hardness** | 75-85 HRB | | **Impact Strength** | 100-120 J | --- ### **4. Product Specifications** **Fitting Types Available:** - **Socket Weld Fittings:** 3000# to 6000# pressure ratings - **Butt Weld Fittings:** Seamless construction - **Threaded Fittings:** NPT and metric threads - **Special Fittings:** Custom configurations **Standard Configurations:** - **Elbows:** 45°, 90°, 180° - **Tees:** Equal and reducing - **Reducers:** Concentric and eccentric - **Caps:** Socket weld and threaded - **Unions:** Precision ground faces **Size Range:** - **Socket Weld:** 1/8" to 2" NPS - **Butt Weld:** 1/2" to 4" NPS - **Threaded:** 1/8" to 2" NPS --- ### **5. Product Applications** **Aerospace & Defense:** - **Satellite Propulsion Systems:** Cryogenic fuel line fittings - **Spacecraft Thermal Control:** Precision cooling system connections - **Avionics Cooling:** Stable fluid circuit fittings - **Optical System Plumbing:** Stable instrument connections **Semiconductor Manufacturing:** - **Extreme Ultraviolet Lithography:** EUVL system fittings - **Ultra-Pure Gas Systems:** High-purity gas panel fittings - **Chemical Delivery Systems:** Precision chemical handling - **Vacuum Chamber Fittings:** High-vacuum compatible connections **Scientific Research:** - **Particle Accelerators:** Beam line vacuum fittings - **Synchrotron Radiation:** Optical component connections - **Cryogenic Research:** Low-temperature system fittings - **Laboratory Instrumentation:** Precision fluid system connections **Medical & Analytical:** - **MRI Systems:** Cryogenic and coolant fittings - **Analytical Instruments:** Chromatography system fittings - **Medical Imaging:** Stable fluid system components - **Research Equipment:** Precision laboratory fittings --- ### **6. International Standards** | Standard Body | Standard Number | Description | |---------------|-----------------|-------------| | **ASTM** | ASTM F1684-06 | Material Specification | | **ASME** | B16.11 | Forged Fittings Standard | | **UNS** | K93603 | Unified Numbering System | | **AMS** | AMS 7726 | Aerospace Material Specification | | **ISO** | ISO 9001 | Quality Management | --- ### **7. Manufacturing & Quality** **Manufacturing Process:** - **Hot Forging:** Optimized grain structure - **Precision Machining:** CNC turning and milling - **Surface Treatment:** Passivation and cleaning - **Quality Testing:** 100% dimensional inspection **Testing Requirements:** - **Hydrostatic Testing:** 1.5 × design pressure - **Dimensional Verification:** CMM inspection - **Material Certification:** 3.1 Mill Certificate - **Traceability:** Full heat code traceability **Quality Standards:** - **Surface Finish:** 32 Ra μin maximum - **Dimensional Tolerances:** Per ASME B16.11 - **Marking:** Permanent identification - **Packaging:** Protected to prevent damage --- ### **8. Special Processing** **Heat Treatment Protocol:** - **Solution Treatment:** 830-850°C, controlled atmosphere - **Stabilization:** 315-370°C for 2-4 hours - **Stress Relieving:** 425-480°C after machining - **Atmosphere Control:** Hydrogen or vacuum essential **Welding Requirements:** - **Process:** GTAW (TIG) exclusively - **Filler Metal:** AWS A5.14 ERNiFeCr-3 - **Preheat:** Not required for standard thicknesses - **Post-Weld Heat Treatment:** Mandatory --- ### **9. Design Considerations** **Thermal Performance:** - CTE approximately 3× lower than standard Invar - Optimal stability in 15-35°C range - Requires thermal conditioning for critical applications - Minimal dimensional change during thermal cycling **Pressure Design:** - Higher strength allows compact designs - Excellent creep resistance at room temperature - Good fatigue performance in cyclic service - Suitable for high-vacuum applications **Application Guidelines:** - Maximum service temperature: 200°C - Corrosion protection required in harsh environments - Compatible with high-purity applications - Special handling to maintain surface quality --- ### **Conclusion** Super Invar 32-5 Fittings (UNS K93603) represent the ultimate in thermal stability for critical connection applications, offering unparalleled dimensional stability under thermal variations. Their exceptionally low coefficient of thermal expansion, combined with robust mechanical properties and precision manufacturing, makes them indispensable for aerospace, semiconductor, and scientific applications where conventional materials cannot meet thermal stability requirements. While demanding in terms of manufacturing controls and quality assurance, these fittings provide reliable performance in the most demanding thermal environments, ensuring system integrity and longevity in precision fluid handling systems.

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 2425 gallon liquid totes Special package is available on request.