Invar 36,Nilo 36 Strip,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 Strip (UNS K93601) - Product Introduction** #### **Overview** **Invar 36**, commercially known as **Nilo 36 Strip** (UNS K93601), represents the precision strip form of the classic 36% nickel-iron low expansion alloy. This product is characterized by its exceptional dimensional stability, precise gauge control, and superior surface quality, making it ideal for high-volume precision components in electronics, instrumentation, and aerospace applications. #### **Key Characteristics** - **Ultra-Low Thermal Expansion:** CTE typically **1.6 × 10⁻⁶/°C** (20-100°C) - **Precision Gauge Control:** Tight thickness tolerances for automated processing - **Excellent Surface Finish:** Suitable for plating and fine etching - **High Formability:** Excellent for stamping, blanking, and forming operations - **Consistent Mechanical Properties:** Uniform characteristics across coil length --- #### **1. Chemical Composition** | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | 35.0 - 37.0 | | **Iron (Fe)** | Balance | | **Carbon (C)** | 0.10 max | | **Manganese (Mn)** | 0.50 max | | **Silicon (Si)** | 0.30 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 | |----------|-------| | **Density** | 8.13 g/cm³ (0.294 lb/in³) | | **Melting Point** | 1425°C (2600°F) | | **Mean CTE (20-100°C)** | **1.6 × 10⁻⁶/°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 | --- #### **3. Mechanical Properties** | Condition | Tensile Strength | Yield Strength | Elongation | |-----------|------------------|----------------|------------| | **Annealed** | 450-520 MPa | 250-310 MPa | 30-40% | | **¼ Hard** | 550-620 MPa | 480-550 MPa | 15-25% | | **½ Hard** | 620-690 MPa | 550-620 MPa | 8-15% | --- #### **4. Product Applications** **Electronics & Semiconductor:** - **Lead Frames:** High-precision semiconductor packages - **Connector Components:** RF and microwave connectors - **Shielding Components:** EMI/RFI shielding applications - **Sensor Elements:** Precision sensing components **Precision Instrumentation:** - **Bimetal Elements:** Low-expansion side of thermostats - **Measuring Instruments:** Precision scales and tapes - **Optical Components:** Mounting and alignment strips - **Watch and Clock Components:** Precision springs and gears **Automotive Electronics:** - **Engine Sensors:** Thermal management components - **Electronic Control Units:** Stable mounting elements - **Sensor Housings:** Precision stamped components - **Connector Systems:** High-reliability connectors **Medical Devices:** - **Surgical Instruments:** Precision components - **Medical Sensors:** Stable sensing elements - **Implantable Devices:** Critical components - **Diagnostic Equipment:** Precision mechanical parts --- #### **5. International Standards** | Standard Body | Standard Number | Description | |---------------|-----------------|-------------| | **ASTM** | ASTM F1684 | Standard Specification for Strip | | **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 | --- #### **6. Available Forms & Specifications** **Thickness Range:** - **Standard Strip:** 0.05 mm to 2.0 mm (0.002" to 0.080") - **Precision Tolerance:** ±0.005 mm for critical applications - **Special Thickness:** Custom thicknesses available **Width Range:** - **Narrow Strip:** 2 mm to 100 mm (0.08" to 4.0") - **Wide Strip:** Up to 300 mm (12.0") - **Slit Edge:** Clean, burr-free edges **Temper Conditions:** - **Annealed (Soft):** Maximum formability - **¼ Hard:** Balance of strength and formability - **½ Hard:** Higher strength applications - **Full Hard:** Maximum strength --- #### **7. Fabrication Characteristics** **Stamping & Blanking:** - **Clearance:** 5-8% of material thickness - **Tool Life:** Excellent with proper tool steel - **Burr Formation:** Minimal with sharp tools - **Springback:** Predictable and consistent **Surface Treatments:** - **Plating:** Excellent for gold, nickel, and tin plating - **Coating:** Suitable for various organic coatings - **Etching:** Good for precision chemical etching - **Annealing:** Bright annealing available **Quality Requirements:** - **Surface Quality:** Free from scratches and imperfections - **Flatness:** Strict flatness tolerances maintained - **Edge Condition:** Clean, burr-free edges - **Dimensional Stability:** Consistent through coil length --- #### **8. Quality Assurance** **Testing & Certification:** - **Dimensional Control:** Continuous monitoring during production - **Surface Inspection:** 100% visual inspection - **Mechanical Testing:** Regular tensile and hardness tests - **Chemical Analysis:** Full compositional verification **Certification Requirements:** - **Material Certificate:** 3.1 Mill Certificate - **Traceability:** Full heat and coil traceability - **RoHS Compliance:** Meets environmental requirements - **REACH Compliance:** Meets chemical safety standards --- #### **Conclusion** Nilo 36 Strip (UNS K93601) offers an exceptional combination of low thermal expansion, precision manufacturing capabilities, and consistent performance for high-volume precision components. Its superior gauge control, surface quality, and formability make it particularly valuable for electronic components, precision instruments, and automotive applications where thermal stability and manufacturing precision are critical. The material's consistent performance in strip form enables reliable high-volume production of components requiring exceptional dimensional stability under thermal cycling conditions.

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 2411 gallon liquid totes Special package is available on request.