Invar 36,Super Invar 32-5 Wire,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

**Product Datasheet: Invar 36 & Super Invar 32-5 (UNS K93050) Wire** **1. Overview** Invar 36 and Super Invar 32-5 wires are precision-drawn forms of the renowned low thermal expansion nickel-iron alloys. These wires maintain the characteristic "Invar Effect" of minimal dimensional change with temperature variations, making them ideal for applications requiring precise thermal stability in linear form. • **Invar 36 Wire**: Standard low-expansion alloy wire for general applications • **Super Invar 32-5 Wire**: Enhanced composition with cobalt for superior CTE performance • **Available Forms**: Round wire, flat wire, shaped wire, and spooled products **2. Chemical Composition (Weight %)** | Element | Invar 36 (ASTM F1684) | Super Invar 32-5 (ASTM F1684) | |---------------|-----------------------|-------------------------------| | Nickel (Ni) | 35.0-37.0% | 31.5-32.5% | | Iron (Fe) | Balance | Balance | | Cobalt (Co) | ≤ 0.5% | 4.8-5.4% | | Carbon (C) | ≤ 0.05% | ≤ 0.05% | | Manganese (Mn)| ≤ 0.35% | ≤ 0.35% | | Silicon (Si) | ≤ 0.25% | ≤ 0.25% | | Chromium (Cr) | ≤ 0.20% | ≤ 0.20% | | Sulfur (S) | ≤ 0.02% | ≤ 0.02% | | Phosphorus (P)| ≤ 0.02% | ≤ 0.02% | **3. Physical & Mechanical Properties** | Property | Invar 36 Wire | Super Invar 32-5 Wire | |-------------------------------|---------------------|-----------------------| | CTE (20-100°C) | 1.6 × 10⁻⁶/°C | 0.6 × 10⁻⁶/°C | | Density (g/cm³) | 8.11 | 8.13 | | Diameter Range | 0.05-6.0 mm | 0.05-6.0 mm | | Melting Point (°C) | 1427 | 1430 | | Tensile Strength (Annealed) | 450-600 MPa | 480-620 MPa | | Tensile Strength (Hard) | 700-900 MPa | 750-950 MPa | | Yield Strength (Annealed) | 250-400 MPa | 280-430 MPa | | Elongation (Annealed) | 25-35% | 20-30% | | Modulus of Elasticity (GPa) | 141 | 141 | | Electrical Resistivity (μΩ·m)| 0.82 | 0.80 | | Thermal Conductivity (W/m·K) | 10.5 | 10.5 | **4. International Standards** | Standard Type | Invar 36 | Super Invar 32-5 | |------------------------|--------------------|---------------------| | Material Standard | ASTM F1684 | ASTM F1684 | | UNS Designation | **K93600** | **K94600** | | Wire Specifications | ASTM B749 | ASTM B749 | | European Standard | EN 1.3912 | EN 1.3981 | | Japanese Standard | JIS Cactus 7 | - | | Dimensional Tolerance | ASTM B750 | ASTM B750 | **5. Available Forms & Conditions** **5.1 Round Wire** - Fine wire: 0.05-1.0 mm diameter - Standard wire: 1.0-6.0 mm diameter - Ultra-fine wire: <0.05 mm (special order) **5.2 Special Wire Forms** - Flat wire: 0.1-3.0 mm thickness - Square and rectangular wire - Shaped wire for specific applications - Welding wire with controlled surface finish **5.3 Temper Conditions** - Annealed (soft) for forming and weaving - Hard drawn for spring applications - Stress-relieved for dimensional stability - Half-hard for general purpose use **6. Product Applications** **6.1 Electronics & Electrical** - Lead frames and connectors - Precision resistors and thermostats - Spark gap electrodes - Electronic packaging components **6.2 Precision Instruments** - Measuring wires and standards - Balance springs in chronometers - Precision scale components - Scientific instrument frames **6.3 Aerospace & Defense** - Satellite mesh and screening - Vibration damping systems - Thermal compensation elements - Structural reinforcement **6.4 Industrial Applications** - Welding wire for Invar structures - Wire mesh for composite tooling - Screening in high-temperature processes - Precision springs and forms **6.5 Special Applications** - Cryogenic instrument components - Optical alignment systems - Semiconductor manufacturing fixtures - Research and development prototypes **7. Technical Advantages** • **Consistent Diameter**: Tight tolerances maintained throughout length • **Excellent Surface Finish**: Suitable for precision applications • **Good Weldability**: Compatible with various welding processes • **High Strength**: Maintains mechanical properties in thin diameters • **Formability**: Can be bent, coiled, and shaped without cracking • **Thermal Stability**: Maintains dimensions across temperature ranges **8. Quality Assurance** - Diameter verification at multiple points - Surface quality inspection - Tensile testing certification - Spooling quality control - Clean packaging for critical applications - Full traceability from melt to final product **9. Packaging Options** - Spool sizes: 5 kg to 200 kg capacity - Coil dimensions: Custom sizes available - Protective wrapping: Anti-corrosion papers - Special packaging: Cleanroom for sensitive applications - Wooden reels: For heavy wire shipments --- *Note: Wire products are supplied with certified test reports. Special surface finishes and coatings available upon request. Technical consultation recommended for specific application requirements.*

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 2442 gallon liquid totes Special package is available on request.