Invar 36,Alloy 36 Wire,UNS K93600,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

### **Invar 36 / Alloy 36 Wire (UNS K93600) - Product Introduction** #### **Overview** Invar 36, also known as Alloy 36 or UNS K93600, is a nickel-iron alloy celebrated for its exceptionally low Coefficient of Thermal Expansion (CTE). The **Wire** form of this alloy extends its unique properties into continuous, flexible configurations that enable applications ranging from precision measurements to electronic interconnections. Alloy 36 wire maintains the characteristic dimensional stability of the alloy while offering formability and continuity over long lengths. #### **Key Characteristics of Alloy 36 Wire** * **Exceptional Dimensional Stability:** CTE typically measures **1.6 x 10⁻⁶/°C** between 20°C and 100°C, ensuring minimal length change with temperature fluctuations * **Excellent Formability:** Can be wound, coiled, and formed into complex shapes while maintaining structural integrity * **Consistent Diameter Control:** Manufactured to tight diameter tolerances for precision applications * **Good Weldability and Solderability:** Compatible with standard joining techniques * **Work Hardening Capability:** Mechanical properties can be enhanced through cold working processes --- #### **1. Chemical Composition** | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | 36.0% min | | **Iron (Fe)** | Balance | | **Carbon (C)** | 0.10% max | | **Manganese (Mn)** | 0.60% max | | **Silicon (Si)** | 0.40% max | | **Phosphorus (P)** | 0.025% max | | **Sulfur (S)** | 0.025% max | | **Cobalt (Co)** | 0.50% max | | **Chromium (Cr)** | 0.25% max | --- #### **2. Physical Properties** | Property | Value / Description | | :--- | :--- | | **Density** | 8.11 g/cm³ (0.293 lb/in³) | | **Melting Point** | ~1427°C (2600°F) | | **Thermal Expansion Coefficient (CTE)** | **1.6 x 10⁻⁶/°C** (20-100°C)
2.7 x 10⁻⁶/°C (20-300°C) | | **Thermal Conductivity** | 10.5 W/m·K (at 20°C) | | **Specific Heat** | 515 J/kg·K (at 20°C) | | **Electrical Resistivity** | 0.75 μΩ·m | | **Magnetic Properties** | Ferromagnetic at room temperature, transitioning to paramagnetic above ~279°C (534°F) | --- #### **3. Typical Mechanical Properties** | Condition | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | | :--- | :--- | :--- | :--- | | **Annealed** | 450-550 MPa (65-80 ksi) | 250-310 MPa (36-45 ksi) | 25-35% | | **Hard Drawn** | 620-760 MPa (90-110 ksi) | 550-690 MPa (80-100 ksi) | 8-15% | --- #### **4. Product Applications** * **Precision Measurement:** * **Geodetic Wires:** Used in surveying and dimensional measurement systems where thermal stability ensures accuracy over long distances * **Reference Wires:** For calibration of precision instruments and laboratory equipment * **EDM (Electrical Discharge Machining) Wires:** Providing stable cutting performance in precision machining * **Electronics & Electrical:** * **Lead Wires:** For high-reliability semiconductor packages and crystal oscillators * **Resistance Wires:** Used in precision resistors and heating elements where stable performance is critical * **Interconnection Wires:** In aerospace and military electronics requiring thermal stability * **Industrial Applications:** * **Sealing Wire:** For high-temperature gaskets and seals in cryogenic and elevated temperature service * **Support Wires:** In optical systems and scientific instruments where minimal thermal expansion is required * **Welding Wire:** For joining Invar 36 components in fabrication * **Specialty Applications:** * **Mesh and Screening:** Woven into mesh for composite reinforcement and filtration * **Springs and Formed Components:** For applications requiring thermal stability in mechanical elements --- #### **5. International Standards** | Standard Body | Standard Designation | Title / Scope | | :--- | :--- | :--- | | **UNS** | **K93600** | Unified Numbering System | | **ASTM** | **ASTM F1684** | Standard Specification for Iron-Nickel and Cobalt-Nickel Alloy Sheet, Strip, and Plate | | **AMS** | **AMS 7725** | Alloy 36, Sheet, Strip, and Plate | | **EN** | **EN 1.3912** | Wrought Steel Products | | **DIN** | **DIN 1.3912** | German Institute for Standardization | | **Customer Specifications** | - | Often supplied to customer-specific requirements for diameter, temper, and surface finish | --- #### **Conclusion** Invar 36 (Alloy 36) Wire, UNS K93600, provides the unique combination of low thermal expansion with the versatility of a wire form. Its ability to maintain dimensional stability while offering flexibility and continuous length makes it invaluable for precision measurement, electronic interconnections, and specialized industrial applications. When sourcing Alloy 36 wire, careful attention to diameter tolerances, surface finish, and temper condition is essential to ensure optimal performance in the intended application.

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 2403 gallon liquid totes Special package is available on request.