Invar 36,Super Invar 32-5 Bar(Round bar, Flat bar),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 Bar (Round Bar & Flat Bar) - UNS K93603 Product Introduction** --- ### **Overview** **Super Invar 32-5 Bar** (UNS K93603), available in both round and flat bar forms, represents the premium grade of low expansion alloys with an exceptionally low coefficient of thermal expansion approximately one-third that of standard Invar 36. These bar products are engineered for applications demanding the highest level of dimensional stability under thermal variations. --- ### **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 (Annealed Condition)** | Property | Round Bar | Flat Bar | |----------|-----------|----------| | **Tensile Strength** | 480-550 MPa | 470-540 MPa | | **Yield Strength (0.2%)** | 280-350 MPa | 270-340 MPa | | **Elongation** | 25-35% | 25-35% | | **Hardness** | 75-85 HRB | 70-80 HRB | --- ### **4. Product Specifications** **Round Bar:** - **Diameter Range:** 5 mm to 200 mm - **Length:** Standard 3-4 meters, cut-to-length available - **Tolerance:** ±0.1 mm (standard), ±0.025 mm (precision) - **Surface Finish:** Hot finished, cold drawn, centerless ground **Flat Bar:** - **Thickness:** 5 mm to 100 mm - **Width:** 20 mm to 300 mm - **Length:** Standard 3-4 meters, cut-to-length available - **Flatness:** 1.5 mm per meter maximum --- ### **5. Product Applications** **Ultra-Precision Engineering:** - **Laser System Components:** Optical mounting bars and bases - **Metrology Equipment:** Reference bars and gauge blocks - **Interferometer Bases:** Stable structural components - **Optical Bench Systems:** Precision rails and supports **Aerospace & Defense:** - **Satellite Structures:** Structural members and mounting bars - **Telescope Systems:** Mirror cells and support frames - **Guidance System Components:** Stable platform elements - **Space Instrumentation:** Precision structural elements **Semiconductor Manufacturing:** - **Wafer Stage Components:** Precision guide bars and rails - **Lithography Equipment:** Structural frames and bases - **Inspection Systems:** Stable reference structures - **Clean Room Equipment:** Precision structural members **Scientific Research:** - **Particle Accelerators:** Beam line support structures - **Cryogenic Apparatus:** Low-temperature structural elements - **Fundamental Physics:** Precision experimental setups - **Laboratory Standards:** Primary reference materials --- ### **6. International Standards** | Standard Body | Standard Number | Description | |---------------|-----------------|-------------| | **ASTM** | ASTM F1684-06 | Standard Specification for Bar Products | | **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. Special Processing Requirements** **Heat Treatment Cycle:** - **Solution Treatment:** 830-850°C in controlled atmosphere - **Quenching:** Rapid cooling to room temperature - **Stabilization:** 315-370°C for 2-4 hours per inch of thickness - **Final Aging:** Controlled cooling to optimize properties **Machining Guidelines:** - **Cutting Tools:** Carbide tools with positive rake angles - **Cutting Speed:** 15-25 m/min for optimal results - **Feed Rate:** 0.1-0.3 mm/rev depending on operation - **Coolant:** Essential for temperature control and surface finish --- ### **8. Quality Assurance** **Mandatory Testing:** - **CTE Verification:** Dilatometer testing per ASTM E228 - **Ultrasonic Inspection:** For internal quality assessment - **Dimensional Verification:** Full compliance with specifications - **Metallographic Examination:** Grain structure evaluation **Certification Requirements:** - **Full Traceability:** From melt to final product - **Heat Treatment Records:** Complete thermal history - **CTE Test Reports:** Actual performance data - **Third-Party Verification:** For critical applications --- ### **9. Design & Application Guidelines** **Thermal Considerations:** - Optimal performance in 0-50°C range - CTE increases outside room temperature range - Requires thermal conditioning for maximum stability - Sensitive to thermal shock conditions **Mechanical Design:** - Higher strength than standard Invar alloys - Excellent fatigue resistance for dynamic applications - Good creep characteristics at room temperature - Suitable for high-vacuum and clean room environments **Application Limitations:** - Maximum service temperature: 200°C - Requires corrosion protection in harsh environments - Magnetic properties similar to other nickel-iron alloys - Higher cost justifies use in critical applications only --- ### **Conclusion** Super Invar 32-5 Bar (UNS K93603) in both round and flat forms represents the ultimate in thermal stability for precision engineering applications. Its exceptionally low coefficient of thermal expansion, approximately three times lower than standard Invar 36, makes it indispensable for applications where dimensional stability at the sub-micron level is critical. While requiring specialized processing and strict quality controls, the material's unparalleled thermal performance justifies its use in the most demanding applications in aerospace, semiconductor manufacturing, and scientific research. Proper selection of product form, adherence to recommended processing guidelines, and comprehensive quality assurance are essential for achieving the material's full potential in precision components and structures.

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 2419 gallon liquid totes Special package is available on request.