Invar 36,Nilo 36 Wire,UNS K93601,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 / Nilo 36 Wire (UNS K93601) - Technical Product Introduction** --- ### **Overview** Invar 36, commercially known as **Nilo 36 Wire** (UNS K93601), represents the wire form of the classic 36% nickel-iron low expansion alloy. This product combines the unique thermal stability of the Invar family with the versatility of wire, offering exceptional dimensional stability in continuous lengths suitable for various precision applications including electronic components, measurement systems, and specialized industrial uses. --- ### **1. Chemical Composition (%)** | Element | Content | |---------|---------| | **Nickel (Ni)** | 35.0-37.0 | | **Iron (Fe)** | Balance | | **Carbon (C)** | ≤0.10 | | **Manganese (Mn)** | ≤0.50 | | **Silicon (Si)** | ≤0.30 | | **Phosphorus (P)** | ≤0.025 | | **Sulfur (S)** | ≤0.025 | | **Cobalt (Co)** | ≤0.50 | | **Chromium (Cr)** | ≤0.25 | --- ### **2. Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.13 g/cm³ | | **Melting Point** | 1425°C | | **Coefficient of Thermal Expansion** | **1.6 × 10⁻⁶/°C** (20-100°C) | | **Thermal Conductivity** | 10.5 W/m·K | | **Specific Heat Capacity** | 515 J/kg·K | | **Modulus of Elasticity** | 145 GPa | | **Electrical Resistivity** | 0.75 μΩ·m | | **Curie Temperature** | 230°C | --- ### **3. Mechanical Properties** | Condition | Tensile Strength | Yield Strength | Elongation | |-----------|------------------|----------------|------------| | **Annealed** | 450-550 MPa | 250-310 MPa | 25-35% | | **Hard Drawn** | 620-760 MPa | 550-690 MPa | 8-15% | | **Stress-Relieved** | 500-600 MPa | 350-450 MPa | 15-25% | --- ### **4. Product Specifications** **Wire Diameter Range:** - **Fine Wire:** 0.025 mm to 0.50 mm - **Medium Wire:** 0.50 mm to 2.0 mm - **Coarse Wire:** 2.0 mm to 6.0 mm **Available Forms:** - **Spooled Wire:** Standard 1-25 kg spools - **Straight Lengths:** Cut to specific lengths - **Special Coatings:** Bare, tinned, or nickel-plated - **Temper Conditions:** Annealed, hard drawn, stress-relieved **Tolerances:** - **Diameter Tolerance:** ±0.001 mm to ±0.01 mm - **Roundness:** Within 50% of diameter tolerance - **Surface Finish:** Smooth, free from defects --- ### **5. Product Applications** **Electronics & Electrical:** - **Lead Wires:** For high-reliability semiconductor packages - **Bonding Wire:** Precision interconnects - **Resistance Wire:** Stable heating elements - **Spring Contacts:** Precision electrical contacts **Precision Instrumentation:** - **Measuring Wires:** Geodetic and survey equipment - **EDM Wire:** Electrical discharge machining - **Reference Wires:** Calibration standards - **Optical Alignment:** Precision positioning wires **Industrial Applications:** - **Welding Wire:** For joining Invar components - **Screening Wire:** Mesh and filter manufacturing - **Fastener Wire:** For precision screw machining - **Support Wires:** In optical and scientific instruments **Specialized Applications:** - **Cryogenic Applications:** Support wires at low temperatures - **Aerospace Components:** Lightweight structural elements - **Medical Devices:** Precision surgical components - **Research Equipment:** Scientific instrument components --- ### **6. International Standards** | Standard Body | Standard Number | Description | |---------------|-----------------|-------------| | **ASTM** | ASTM F1684 | Standard Specification for Wire | | **AMS** | AMS 7725 | Aerospace Material Specification | | **DIN** | DIN 1.3912 | German Standard | | **EN** | EN 1.3912 | European Standard | | **JIS** | JIS NCF 2 | Japanese Industrial Standard | | **GB** | GB 4J36 | Chinese National Standard | --- ### **7. Fabrication Characteristics** **Forming & Processing:** - **Bend Radius:** Minimum 2× diameter for hard wire - **Winding Characteristics:** Excellent for coil winding - **Springback:** Predictable and consistent - **Work Hardening:** Moderate rate, requires annealing **Joining Methods:** - **Welding:** GTAW (TIG) with matching filler - **Brazing:** Excellent with silver-based alloys - **Soldering:** Good compatibility with tin-based solders - **Resistance Welding:** Suitable for spot welding **Heat Treatment:** - **Annealing:** 830-880°C, rapid cool - **Stress Relieving:** 425-540°C, 30-60 minutes - **Atmosphere:** Hydrogen or vacuum recommended --- ### **8. Quality Assurance** **Testing & Inspection:** - **Dimensional Verification:** Laser micrometer control - **Surface Quality:** Microscopic examination - **Tensile Testing:** Regular mechanical property checks - **Winding Tests:** Spooling performance verification **Certification & Documentation:** - **Material Certification:** 3.1 Mill Certificate - **Traceability:** Full heat and spool traceability - **Chemical Analysis:** Certified composition report - **RoHS/REACH Compliance:** Environmental compliance **Special Requirements:** - **Clean Room Packaging:** For electronic applications - **Anti-Corrosion Protection:** VCI packaging available - **Custom Spooling:** Specific winding patterns - **Special Marking:** Color coding or other identification --- ### **9. Design Considerations** **Electrical Applications:** - Consistent electrical resistivity - Good solderability and bondability - Stable performance under thermal cycling **Mechanical Applications:** - Excellent fatigue resistance - Good creep characteristics - Maintains properties at extreme temperatures **Processing Guidelines:** - Proper spool handling to prevent tangling - Appropriate wire straightening techniques - Correct annealing procedures when required - Suitable storage conditions to prevent corrosion --- ### **Conclusion** Nilo 36 Wire (UNS K93601) offers an exceptional combination of low thermal expansion, consistent mechanical properties, and excellent processability in wire form. Its unique characteristics make it particularly valuable for precision applications in electronics, instrumentation, and specialized industrial sectors where dimensional stability in wire form is critical. The material's consistent performance across various diameters and tempers ensures reliable operation in demanding applications. Proper selection of diameter, temper condition, and surface finish is essential for achieving optimal performance in specific applications. The comprehensive quality assurance and international standard compliance guarantee material consistency and reliability for critical applications.

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 2416 gallon liquid totes Special package is available on request.