Invar 36,Super Invar 32-5 Pipe,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 Pipe (UNS K93050) - Technical Product Introduction** --- ### **Overview** **Super Invar 32-5 Pipe** (UNS K93050) represents the tubular form of the advanced iron-nickel-cobalt alloy known for its exceptionally low coefficient of thermal expansion. This product combines the ultra-low thermal expansion characteristics of Super Invar with the geometric advantages of pipe, making it ideal for precision fluid handling systems and structural applications where dimensional stability under thermal cycling is paramount. --- ### **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 | | **Magnetic Properties** | Ferromagnetic below 250°C | --- ### **3. Mechanical Properties** | Property | Seamless Pipe | Welded & Drawn Pipe | |----------|---------------|---------------------| | **Tensile Strength** | 480-550 MPa | 470-530 MPa | | **Yield Strength (0.2% Offset)** | 280-350 MPa | 270-330 MPa | | **Elongation** | 25-35% | 20-30% | | **Hardness** | 75-85 HRB | 70-80 HRB | --- ### **4. Product Specifications** **Pipe Types:** - **Seamless Pipe:** Maximum integrity for high-pressure applications - **Welded & Drawn Pipe:** Superior dimensional control and surface finish **Size Range:** - **Outside Diameter:** 6 mm to 150 mm - **Wall Thickness:** 1.0 mm to 10.0 mm - **Length:** Standard 3-6 meters, cut-to-length available **Pressure Ratings:** - **Schedule 5S:** Light wall for low-pressure applications - **Schedule 10S:** Standard wall for general applications - **Special Schedules:** Custom wall thicknesses available --- ### **5. Product Applications** **Aerospace & Defense:** - **Satellite Propellant Lines:** Dimensionally stable fuel and oxidizer transfer - **Spacecraft Cooling Systems:** Precision thermal management conduits - **Avionics Thermal Control:** Stable coolant pathways for electronic systems - **Cryogenic Fuel Systems:** LNG and liquid hydrogen transfer lines **Semiconductor Manufacturing:** - **Ultra-High Purity Gas Lines:** Stable delivery systems for process gases - **Chemical Distribution:** Precision chemical delivery piping - **Vacuum Chamber Components:** Structural and gas feed elements - **Wafer Processing Equipment:** Process gas and coolant lines **Scientific Research:** - **Particle Accelerator Components:** Beam line vacuum chambers - **Cryogenic Research Equipment:** Liquid gas transfer systems - **Telescope Cooling Systems:** Stable coolant conduits - **Laboratory Instrumentation:** Precision fluid handling systems **Precision Engineering:** - **Laser Cooling Systems:** Stable water cooling conduits - **Metrology Equipment:** Temperature-stable structural elements - **Optical System Components:** Stable mounting and support structures - **Medical Imaging Systems:** Precision coolant and gas lines --- ### **6. International Standards** | Standard Body | Standard Number | Description | |---------------|-----------------|-------------| | **ASTM** | ASTM F1684-06 | Standard Specification for Pipe and Tube | | **UNS** | K93050 | Unified Numbering System | | **AMS** | AMS 7726 | Aerospace Material Specification | | **ASME** | SA-658 | Boiler and Pressure Vessel Code | | **JIS** | JIS NCF 3 | Japanese Industrial Standard | --- ### **7. Fabrication & Processing** **Welding Requirements:** - **Preferred Process:** GTAW (TIG) with matching filler metal - **Filler Metal:** AWS A5.14 ERNiFeCr-3 or equivalent - **Shielding Gas:** High-purity argon or argon-helium mixtures - **Post-Weld Heat Treatment:** Mandatory for stress relief **Heat Treatment Protocol:** - **Solution Treatment:** 830-850°C followed by rapid cooling - **Stabilization Treatment:** 315-370°C for 2-4 hours - **Stress Relieving:** 425-480°C after fabrication - **Atmosphere Control:** Hydrogen or vacuum recommended **Forming & Bending:** - **Minimum Bend Radius:** 3 × OD for seamless pipe - **Bending Methods:** Mandrel bending for tight radii - **Annealing Requirements:** Intermediate annealing for severe deformation - **Surface Protection:** Essential during forming operations --- ### **8. Quality Assurance** **Mandatory Testing:** - **CTE Verification:** Dilatometer testing per ASTM E228 - **Hydrostatic Testing:** 1.5 × design pressure for 10 seconds - **Ultrasonic Testing:** 100% examination for critical applications - **Dimensional Verification:** Full compliance with specifications **Certification Requirements:** - **Full Traceability:** From raw material to finished pipe - **Heat Treatment Records:** Complete thermal history documentation - **CTE Test Reports:** Actual performance data for each heat - **Third-Party Verification:** Required for aerospace applications --- ### **9. Design & Application Considerations** **Thermal Performance:** - Optimal CTE performance in room temperature range - Requires thermal conditioning for maximum stability - Sensitive to thermal gradients during operation - Excellent long-term dimensional stability **Pressure Design:** - Higher strength allows thinner wall designs - Good creep resistance at room temperature - Excellent fatigue performance in cyclic service - Suitable for high-vacuum applications **Corrosion Considerations:** - Similar corrosion resistance to standard Invar - Requires protection in corrosive environments - Compatible with high-purity applications - Suitable for ultra-clean processing systems --- ### **Conclusion** Super Invar 32-5 Pipe (UNS K93050) offers unparalleled thermal stability in tubular form, making it the material of choice for critical applications where dimensional stability in piping systems is essential. Its exceptionally low coefficient of thermal expansion, approximately three times lower than standard Invar 36, combined with good mechanical properties and fabricability, makes it indispensable for aerospace, semiconductor, and scientific applications. The material's superior performance justifies the additional processing controls and costs for applications where dimensional stability in fluid handling systems is critical. Proper design, fabrication following recommended procedures, and comprehensive quality assurance are essential for achieving optimal performance in service.

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 2433 gallon liquid totes Special package is available on request.