Invar 36,Nilo 36 Sheet,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 Sheet (UNS K93601) - Product Introduction** #### **Overview** **Invar 36**, commercially known as **Nilo 36 Sheet** (UNS K93601), is the sheet form of the renowned 36% nickel-iron low expansion alloy. Characterized by its exceptional dimensional stability across temperature variations, this product provides a versatile thin-stock material for applications requiring minimal thermal expansion combined with excellent formability and surface quality. #### **Key Characteristics** - **Ultra-Low Thermal Expansion:** CTE typically **1.6 × 10⁻⁶/°C** (20-100°C) - **Excellent Formability:** Can be readily stamped, drawn, and formed - **Superior Surface Quality:** Uniform, smooth surface finish - **Good Weldability:** Compatible with standard welding processes - **Consistent Thickness Control:** Precision rolling for uniform gauge --- #### **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 (Annealed Condition)** | Property | Value | |----------|-------| | **Tensile Strength** | 450-520 MPa (65-75 ksi) | | **Yield Strength (0.2% Offset)** | 250-310 MPa (36-45 ksi) | | **Elongation** | 30-40% | | **Hardness** | 70-80 HRB | | **Shear Strength** | 380-450 MPa (55-65 ksi) | --- #### **4. Product Applications** **Electronics & Semiconductor:** - **Lead Frames:** Semiconductor packaging components - **Electronic Packaging:** Housings and shields - **Circuit Board Supports:** Stable mounting elements - **RF Components:** Microwave circuit substrates **Aerospace & Defense:** - **Aircraft Instrument Panels:** Stable mounting surfaces - **Satellite Components:** Thin structural elements - **Optical Mounts:** Precision alignment components - **Thermal Management:** Heat spreader applications **Industrial Applications:** - **Bimetal Thermostats:** Low-expansion element - **Precision Scales:** Measurement tape substrates - **Laser System Components:** Optical mounting plates - **Cryogenic Equipment:** Seals and gasket materials **Display Technology:** - **Shadow Masks:** OLED display manufacturing - **Display Frames:** Structural support elements - **Optical Shutters:** Precision moving components --- #### **5. International Standards** | Standard Body | Standard Number | Description | |---------------|-----------------|-------------| | **ASTM** | ASTM F1684 | Standard Specification for Sheet and 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 Sheet:** 0.5 mm to 6.0 mm (0.020" to 0.250") - **Precision Thickness Control:** ±0.02 mm to ±0.05 mm - **Special Thickness:** Available on request **Standard Sizes:** - **Width:** 600 mm to 1500 mm (24" to 60") - **Length:** 1200 mm to 3000 mm (48" to 120") - **Custom Sizes:** Available per requirements **Surface Finish:** - **2B Finish:** Bright cold-rolled finish - **BA Finish:** Bright annealed finish - **Matte Finish:** Dull surface appearance - **Special Finishes:** Available per specification --- #### **7. Fabrication Characteristics** **Forming & Stamping:** - **Bend Radius:** Minimum 1t (material thickness) - **Deep Drawing:** Excellent performance in annealed condition - **Stamping:** Clean edges with minimal burring - **Springback:** Moderate, requires compensation **Welding & Joining:** - **TIG Welding:** Preferred method - **Resistance Welding:** Spot and seam welding suitable - **Brazing:** Compatible with standard brazing alloys - **Adhesive Bonding:** Good surface for bonding **Machining:** - **Cutting:** Laser, waterjet, and shear cutting suitable - **Punching:** Clean holes with proper clearance - **Milling:** Requires sharp tools and positive rake angles --- #### **8. Quality Assurance** **Testing & Certification:** - **Dimensional Inspection:** 100% thickness verification - **Surface Quality:** Visual and microscopic inspection - **Flatness:** Standard and precision tolerances available - **Certification:** 3.1 Mill Certificate with traceability **Quality Standards:** - **Chemical Analysis:** Spectrographic verification - **Mechanical Testing:** Tensile and hardness testing - **Surface Inspection:** Per ASTM A480 requirements - **Packaging:** Protected surface packaging --- #### **Conclusion** Nilo 36 Sheet (UNS K93601) provides an optimal combination of low thermal expansion, excellent formability, and consistent quality for thin-stock applications. Its exceptional dimensional stability makes it particularly valuable for electronic components, precision instruments, and aerospace applications where thermal management is critical. The material's consistent performance, coupled with its fabrication versatility, ensures reliable performance in demanding thermal environments. Proper selection of thickness, temper, and surface finish is essential for achieving optimal results in specific 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 2410 gallon liquid totes Special package is available on request.