Invar 36,Nilo 36 Plate,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 Plate (UNS K93601) - Product Introduction** #### **Overview** **Invar 36**, commercially known as **Nilo 36 Plate** (UNS K93601), represents the plate form of the classic 36% nickel-iron low expansion alloy. This product is characterized by its exceptional dimensional stability across temperature variations, making it indispensable for applications where thermal expansion must be minimized. The plate form provides robust, flat stock material suitable for machining large components, structural elements, and tooling applications. #### **Key Characteristics** * **Ultra-Low Thermal Expansion:** CTE typically **1.6 × 10⁻⁶/°C** (20-100°C) * **Excellent Flatness & Stability:** Maintains dimensional integrity under thermal cycling * **Superior Machinability:** Good machining characteristics in various conditions * **High Strength & Rigidity:** Suitable for structural and tooling applications * **Good Weldability:** Compatible with standard welding processes --- #### **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 Coefficient of Thermal Expansion** | **1.6 × 10⁻⁶/°C** (20-100°C)
4.5 × 10⁻⁶/°C (20-500°C) | | **Thermal Conductivity** | 10.5 W/m·K (71 BTU·in/hr·ft²·°F) | | **Specific Heat Capacity** | 515 J/kg·K (0.123 BTU/lb·°F) | | **Modulus of Elasticity** | 145 GPa (21 × 10⁶ psi) | | **Magnetic Properties** | Ferromagnetic below 230°C (446°F) | --- #### **3. Mechanical Properties (Annealed Condition)** | Property | Value | |----------|-------| | **Tensile Strength** | 480-550 MPa (70-80 ksi) | | **Yield Strength (0.2% Offset)** | 280-350 MPa (41-51 ksi) | | **Elongation** | 30-40% | | **Reduction of Area** | 55-65% | | **Hardness** | 75-85 HRB | | **Shear Modulus** | 55 GPa (8.0 × 10⁶ psi) | --- #### **4. Product Applications** **Aerospace & Defense:** * **Satellite Structural Components:** Optical benches and mounting plates * **Aircraft Tooling:** Jigs and fixtures for composite manufacturing * **Radar System Bases:** Stable platforms for precision electronics * **Space Telescope Components:** Structural frames and mounting plates **Semiconductor Manufacturing:** * **Wafer Processing Equipment:** Chamber components and base plates * **Lithography Tooling:** Precision stages and mounting surfaces * **Vacuum Chamber Flanges:** Large diameter sealing surfaces * **Metrology Equipment:** Base plates for measurement systems **Tooling & Manufacturing:** * **Composite Molding Tools:** Matched-die molds for aerospace composites * **Precision Measurement Equipment:** Surface plates and granite replacements * **Laser System Bases:** Stable platforms for optical systems * **Cryogenic Equipment:** Structural components for LNG applications **Scientific Research:** * **Particle Accelerator Components:** Beam line mounting plates * **Telescope Mirror Blanks:** Stable substrates for optical systems * **Laboratory Equipment:** Vibration-resistant mounting plates * **Metrology Standards:** Reference surfaces and base plates --- #### **5. International Standards** | Standard Body | Standard Number | Description | |---------------|-----------------|-------------| | **ASTM** | ASTM F1684 | Standard Specification for Iron-Nickel and Cobalt-Nickel Alloy Plate | | **AMS** | AMS 7725 | Aerospace Material Specification | | **ASME** | SA-658 | Boiler and Pressure Vessel Code Specification | | **DIN** | DIN 1.3912 | German Standard | | **EN** | EN 1.3912 | European Standard | | **JIS** | JIS NCF 2 | Japanese Industrial Standard | --- #### **6. Available Forms & Specifications** **Plate Thickness:** * **Standard Range:** 6 mm to 150 mm (0.25" to 6") * **Heavy Plate:** Up to 300 mm (12") available * **Tolerance:** Per ASTM A480/A480M **Standard Sizes:** * **Width:** 1000 mm to 2000 mm (39" to 79") * **Length:** 2000 mm to 4000 mm (79" to 157") * **Custom Sizes:** Available per customer requirements **Surface Conditions:** * **Hot Rolled:** As-rolled surface condition * **Annealed & Pickled:** Clean, scale-free surface * **Machined Surfaces:** Rough or finish machined * **Ground Plates:** Precision surface grinding available --- #### **7. Fabrication & Processing** **Machining Guidelines:** * **Turning:** 20-35 m/min (65-115 SFM) * **Milling:** 30-45 m/min (100-150 SFM) * **Drilling:** 10-15 m/min (30-50 SFM) * **Tool Geometry:** Positive rake angles recommended **Welding Procedures:** * **Processes:** GTAW (TIG), GMAW (MIG), SMAW * **Filler Metal:** AWS A5.14 ERNiFeCr or matching composition * **Preheat:** Not typically required * **Post-Weld Heat Treatment:** 425-540°C (800-1000°F) **Heat Treatment:** * **Annealing:** 830-880°C (1525-1615°F), rapid cool * **Stress Relieving:** 425-540°C (800-1000°F), 1-2 hours per inch --- #### **8. Quality Assurance** **Testing & Inspection:** * **Ultrasonic Testing:** Per ASTM A578/A578M * **Dimensional Verification:** Full compliance with specified tolerances * **Surface Inspection:** Visual and dimensional checks * **Material Certification:** 3.1 Mill Certificate provided **Certification & Documentation:** * **Material Traceability:** Heat number and lot traceability * **Chemical Analysis:** Certified composition report * **Mechanical Properties:** Certified test reports * **Compliance:** RoHS, REACH compliant --- #### **Conclusion** Nilo 36 Plate (UNS K93601) offers an unparalleled combination of dimensional stability, mechanical strength, and manufacturing versatility for flat stock applications. Its exceptional thermal stability makes it the material of choice for aerospace tooling, semiconductor equipment, and precision instrumentation where dimensional integrity under thermal cycling is critical. The availability in various thicknesses and sizes, combined with comprehensive international standard compliance, ensures that engineers can specify this material with confidence for demanding applications. Proper fabrication techniques and adherence to recommended machining and welding procedures are essential to maintain the material's unique properties in finished components.

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 2409 gallon liquid totes Special package is available on request.