Alloy PK33,Nimonic PK33 Foil,Shim,,E FORU

British Specs:DTD 5057，American Specs:，German Specs: AFNOR NC19 KDu/v

### **Technical Data Sheet: Alloy PK33 / Nimonic PK33 Foil & Shim Stock** **Precision-Engineered High-Temperature Spacers and Seals** #### **1. Overview** **Alloy PK33 (Nimonic PK33) Foil and Shim Stock** represents the high-performance, thin-gauge form of the renowned nickel-chromium superalloy. This product is engineered for applications requiring precise thickness control, exceptional high-temperature strength, and outstanding resistance to oxidation and creep under load. Supplied as thin sheets, strips, or pre-cut shims, this material is the solution for critical sealing, spacing, and isolation tasks in extreme environments where common materials like stainless steel or aluminum would fail. Its ability to maintain spring properties and dimensional stability under stress at high temperatures makes it indispensable in aerospace and power generation. #### **2. Chemical Composition (Typical Weight %)** The composition conforms to the standard for Nimonic PK33, ensuring consistent high-temperature performance. | Element | Content (%) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Austenitic matrix, provides base corrosion resistance and toughness. | | **Chromium (Cr)** | 18.0 - 21.0 | Confers excellent oxidation and hot corrosion resistance. | | **Cobalt (Co)** | 16.0 - 21.0 | Solid solution strengthener, enhances high-temperature stability. | | **Molybdenum (Mo)**| 4.5 - 6.0 | Potent solid solution strengthener, improves creep strength. | | **Titanium (Ti)** | 2.8 - 3.5 | Forms the primary strengthening γ' phase (Ni₃Ti). | | **Aluminum (Al)** | 1.3 - 1.9 | Forms the primary strengthening γ' phase (Ni₃Al). | | **Carbon (C)** | 0.10 max | Forms carbides for grain boundary strength. | | **Zirconium (Zr)** | 0.05 max | Improves creep ductility. | | **Boron (B)** | 0.005 max | Enhances grain boundary strength. | | **Iron (Fe)** | 2.0 max | Impurity control. | | **Manganese (Mn)**| 0.50 max | Trace element. | | **Silicon (Si)** | 0.50 max | Trace element. | #### **3. Physical & Mechanical Properties (Foil/Shim)** * **Density:** 8.15 g/cm³ * **Melting Range:** ~1330 - 1360 °C (~2425 - 2480 °F) * **Continuous Service Temperature:** Up to 850°C (1560°F) in oxidizing atmospheres. * **Thermal Conductivity:** ~ 12.0 W/m·K (at 20°C) * **Coefficient of Thermal Expansion:** ~ 13.5 μm/m·K (20 - 100°C). This closely matches other superalloys, minimizing thermal stress in assemblies. **Key Characteristics for Foil/Shim Applications:** * **High-Temperature Strength:** Retains a significant portion of its room-temperature strength and hardness at elevated temperatures, preventing extrusion or deformation under bolt load. * **Excellent Spring Properties:** Maintains its "spring-back" and clamping force at high temperatures, crucial for maintaining seal integrity in gaskets and stack-ups. * **Outstanding Oxidation Resistance:** Forms a protective, adherent layer of chromium oxide (Cr₂O₃) that prevents further degradation. * **Creep Resistance:** Resists slow deformation under sustained mechanical stress and heat, ensuring long-term dimensional stability. #### **4. Standard Specifications & Forms** **International Standards:** While often supplied to customer-specific drawings, the base material typically conforms to: * **Aerospace (SAE/AMS):** **AMS 5891** (Bar and forging standard, chemistry reference for foil/shim) * **European (EN):** **2.4634** (Material Number) **Available Forms:** * **Foil / Thin Strip:** Typically supplied in rolls or flat sheets. * **Shim Stock:** Supplied in sheets or pre-cut blanks. * **Custom Pre-Cut Shims:** Manufactured to precise customer drawings (e.g., ring shims, complex geometries). **Common Thickness Range:** * **Standard Foil/Shim:** 0.05 mm (0.002") to 1.0 mm (0.040"). * **Custom Thickness:** Available upon request. #### **5. Product Applications** Nimonic PK33 foil and shims are used in the most demanding high-temperature locations: * **Aerospace & Gas Turbine Engines:** * **Turbine Case Seals and Shim Spacers:** For maintaining precise clearances between static components. * **Combustor Seals:** Critical for containing hot gases. * **Exhaust Section Seals and Insulation Blankets.** * **Compressor and Turbine Stack-Up Spacers:** Where high strength and temperature resistance are required. * **Power Generation (Industrial Gas Turbines):** * Similar applications as in aerospace, for stationary power turbine casings, transitions, and seals. * **High-Temperature Test and R&D Facilities:** * Used for constructing custom furnaces, jigs, and fixtures. #### **6. Fabrication & Handling Notes** * **Heat Treatment:** Foil and shim stock are typically supplied in a solution-annealed or a solution-treated and aged condition to achieve the desired mechanical properties. Post-delivery heat treatment is generally not recommended for thin sections. * **Forming:** Can be formed and shaped in the annealed condition. It has moderate formability; tight bends may require specialized tooling. * **Joining:** Can be welded using TIG or resistance welding techniques, but requires expertise due to its precipitation-hardening nature. * **Storage:** Should be stored in a clean, dry environment to prevent surface contamination or pitting. --- **Disclaimer:** This data sheet is for informational purposes only. Properties and performance can vary based on thickness, heat treatment, and manufacturing process. For critical applications, always consult with our technical engineering team and refer to the official material certification.

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 2194 gallon liquid totes Special package is available on request.