Invar 36,Super Invar 32-5 Plate,UNS K93050,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

### **Product Datasheet: Invar 36 & Super Invar 32-5 (UNS K93050) Plate** #### **1. Overview** **Invar 36** and **Super Invar 32-5** are nickel-iron alloys renowned for their exceptionally **Low Coefficient of Thermal Expansion (CTE)**. The name "Invar," derived from "invariable," perfectly describes its key characteristic: superior **dimensional stability** under thermal stress. * **Invar 36** is the standard alloy, offering a near-zero CTE around room temperature. * **Super Invar 32-5** is a premium grade with a 5% Cobalt addition, delivering an ultra-low CTE, approximately three times lower than standard Invar 36 at room temperature. Supplied in **plate form**, this material is essential for manufacturing large, stable structures in industries where minimal thermal expansion is critical. The Unified Numbering System (UNS) designation **K93050** is a general classification for these low-expansion iron-nickel alloys. #### **2. Chemical Composition (Weight %)** | Element | Invar 36 (ASTM F1684) | Super Invar 32-5 (ASTM F1684) | | :--- | :--- | :--- | | **Nickel (Ni)** | 36.0% | 32.0% | | **Iron (Fe)** | Balance | Balance | | **Cobalt (Co)** | - | 5.0% | | **Carbon (C)** | ≤ 0.05% | ≤ 0.05% | | **Manganese (Mn)**| ≤ 0.35% | ≤ 0.35% | | **Silicon (Si)** | ≤ 0.25% | ≤ 0.25% | | **Chromium (Cr)**| ≤ 0.20% | ≤ 0.20% | | **Sulfur (S)** | ≤ 0.02% | ≤ 0.02% | | **Phosphorus (P)**| ≤ 0.02% | ≤ 0.02% | #### **3. Physical & Mechanical Properties (Typical for Annealed Plate)** | Property | Invar 36 | Super Invar 32-5 | | :--- | :--- | :--- | | **Coefficient of Thermal Expansion (CTE)** | **1.6 x 10⁻⁶/°C**
(20°C to 100°C) | **0.6 x 10⁻⁶/°C**
(20°C to 100°C) | | **Density** | 8.11 g/cm³ | 8.13 g/cm³ | | **Melting Point** | ~1427°C (2600°F) | ~1430°C (2610°F) | | **Curie Temperature** | ~279°C (535°F) | ~310°C (590°F) | | **Thermal Conductivity** | 10.5 W/m·K (at 23°C) | 10.5 W/m·K (at 23°C) | | **Specific Heat** | 515 J/kg·K (at 20°C) | 515 J/kg·K (at 20°C) | | **Tensile Strength** | 517 MPa (75 ksi) | 552 MPa (80 ksi) | | **Yield Strength (0.2% Offset)**| 276 MPa (40 ksi) | 345 MPa (50 ksi) | | **Elongation (in 2")** | 30% | 25% | | **Modulus of Elasticity** | 141 GPa (20.5 x 10⁶ psi) | 141 GPa (20.5 x 10⁶ psi) | | **Hardness (Rockwell B)** | 75 HRB | 80 HRB | #### **4. International Standards** | Standard Type | Invar 36 | Super Invar 32-5 | | :--- | :--- | :--- | | **Material Standard** | ASTM F1684 | ASTM F1684 | | **Unified Numbering System (UNS)** | **K93600** | **K94600** | | **European Standard (EN)** | Ni36 (1.3912) | Ni32Co5Cu (1.3981) | | **Japanese Standard (JIS)** | NILO 36 (Cactus 7) | - | *Note: UNS K93050 is a general prefix. For precise specification, use **UNS K93600** for Invar 36 and **UNS K94600** for Super Invar. Plate dimensions and tolerances typically conform to standards like ASTM A480/A480M.* #### **5. Product Applications** Invar plate is critical for applications requiring maximum dimensional stability: * **Aerospace & Defense:** Satellite structural frames, optical mounting plates, and composite molding tools. * **Semiconductor Manufacturing:** Stages for photolithography equipment (e.g., EUV lithography), metrology frames, and wafer handling systems. * **Precision Instrumentation:** Optical benches, interferometer bases, and large telescope measuring scales. * **Cryogenics:** Internal structures and supports within LNG tanks and cryogenic vessels. * **Molding Composites:** Tools and molds for curing carbon fiber composites in aerospace and automotive industries. #### **6. Key Advantages of Plate Form** * **Unmatched Dimensional Stability:** Maintains shape and flatness across extreme temperature gradients. * **Excellent Machinability:** Can be machined into complex, high-tolerance components. * **Structural Integrity:** Provides a robust and stable base for high-precision assemblies. * **Weldability:** Can be welded using matching filler metals to create large, stable fabrications. --- **Disclaimer:** The values provided are typical and for informational purposes. Specific properties for a given plate lot should be confirmed with the manufacturer's certified test report. Machining and welding require specialized techniques.

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 2435 gallon liquid totes Special package is available on request.