Invar 36,Super Invar 32-5 Tube,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 Tube (UNS K93603) - Technical Product Introduction** --- ### **Overview** **Super Invar 32-5 Tube** (UNS K93603) represents the precision tubular form of the advanced iron-nickel-cobalt alloy, offering the lowest coefficient of thermal expansion among commercially available metal alloys. This product is specifically engineered for applications requiring exceptional dimensional stability in precision tubing configurations, making it ideal for advanced instrumentation, aerospace, and semiconductor 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 | | **Curie Temperature** | 250°C | --- ### **3. Mechanical Properties** | Condition | Tensile Strength | Yield Strength | Elongation | Hardness | |-----------|------------------|----------------|------------|----------| | **Annealed** | 480-550 MPa | 280-350 MPa | 25-35% | 75-85 HRB | | **Hard Drawn** | 620-750 MPa | 550-680 MPa | 8-15% | 90-100 HRB | --- ### **4. Product Specifications** **Tube Types:** - **Seamless Tube:** Maximum integrity for precision applications - **Welded & Drawn Tube:** Superior dimensional control **Size Range:** - **Outside Diameter:** 1.5 mm to 50 mm - **Wall Thickness:** 0.3 mm to 5.0 mm - **Length:** Standard 3-6 meters, custom lengths available **Tolerance Classes:** - **Standard Tolerance:** ±0.05 mm OD, ±10% wall thickness - **Precision Tolerance:** ±0.01 mm OD, ±5% wall thickness - **Ultra-Precision:** ±0.005 mm OD, ±3% wall thickness --- ### **5. Product Applications** **Aerospace & Defense:** - **Satellite Thermal Control:** Precision heat transfer conduits - **Spacecraft Instrumentation:** Stable sensor and optical component housings - **Avionics Cooling:** Dimensionally stable cooling channels - **Guidance Systems:** Stable structural tubing for inertial platforms **Semiconductor Manufacturing:** - **Extreme Ultraviolet Lithography:** Stable vacuum chamber components - **Wafer Processing:** Ultra-pure gas and chemical delivery lines - **Metrology Equipment:** Precision reference tubing - **Vacuum Systems:** Stable structural elements in process chambers **Scientific Research:** - **Particle Accelerators:** Precision beam line components - **Synchrotron Radiation:** Stable optical component housings - **Cryogenic Systems:** Dimensionally stable transfer lines - **Fundamental Physics:** Precision experimental apparatus **Medical & Instrumentation:** - **MRI Systems:** Stable cryogenic and structural components - **Laboratory Instruments:** Precision fluid handling systems - **Optical Systems:** Stable mounting and alignment structures - **Measurement Standards:** Primary length reference tubing --- ### **6. International Standards** | Standard Body | Standard Number | Description | |---------------|-----------------|-------------| | **ASTM** | ASTM F1684-06 | Standard Specification for Tube | | **UNS** | K93603 | Unified Numbering System | | **AMS** | AMS 7726 | Aerospace Material Specification | | **DIN** | DIN 2.3360 | German Standard | | **JIS** | JIS NCF 3 | Japanese Industrial Standard | --- ### **7. Special Processing Requirements** **Manufacturing Process:** - **Cold Drawing:** Multiple passes with intermediate annealing - **Surface Finish:** Typical Ra 0.4 μm or better - **Straightness:** 0.5 mm per meter maximum - **Cleanliness:** Suitable for high-purity applications **Heat Treatment:** - **Solution Annealing:** 830-850°C in controlled atmosphere - **Stabilization:** 315-370°C for 1-2 hours - **Stress Relieving:** 425-480°C after final fabrication - **Atmosphere:** Hydrogen or vacuum essential --- ### **8. Quality Assurance** **Testing Requirements:** - **CTE Verification:** Dilatometer testing per ASTM E228 - **Eddy Current Testing:** 100% examination for defects - **Hydrostatic Testing:** Optional for pressure applications - **Dimensional Verification:** Statistical process control **Certification:** - **Material Traceability:** Full manufacturing history - **Heat Treatment Records:** Complete thermal cycle documentation - **CTE Certification:** Batch-specific test data - **Cleanliness Certification:** For high-purity applications --- ### **9. Design Considerations** **Thermal Performance:** - CTE approximately 3× lower than standard Invar 36 - Optimal stability in 15-35°C range - Requires thermal conditioning for critical applications - Minimal hysteresis in thermal cycling **Mechanical Design:** - Higher strength-to-weight ratio than standard Invar - Excellent fatigue resistance in thin-walled sections - Good creep resistance at room temperature - Suitable for high-vacuum and clean room use **Fabrication Notes:** - **Bending:** Minimum radius 2× OD with proper tooling - **Welding:** GTAW with matching filler metal required - **Machining:** Similar to standard Invar but tighter controls - **Handling:** Special care to prevent surface damage --- ### **Conclusion** Super Invar 32-5 Tube (UNS K93603) represents the pinnacle of dimensional stability in precision tubing applications. Its exceptionally low coefficient of thermal expansion, combined with excellent mechanical properties and manufacturing precision, makes it indispensable for applications where sub-micron dimensional stability is required. While demanding in terms of processing controls and quality assurance, its unparalleled thermal performance justifies its use in the most critical aerospace, semiconductor, and scientific applications. Proper design, fabrication following strict protocols, and comprehensive quality control are essential to realize the full benefits of this exceptional material in precision tubular 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 2421 gallon liquid totes Special package is available on request.