Alloy PK33,Nimonic PK33 Other/Similar Specs,,E FORU

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

### **Technical Data Sheet: Alloy PK33 / Nimonic PK33** **A High-Strength, Creep-Resistant Nickel-Chromium Superalloy** #### **1. Overview** Alloy PK33, more commonly known internationally by its proprietary name **Nimonic PK33**, is a precipitation-hardened nickel-chromium superalloy. It is specifically engineered for exceptional high-temperature strength, outstanding resistance to creep (deformation under load), and excellent oxidation resistance. This alloy is primarily supplied in the form of bar, wire, and forgings for the most demanding applications in aerospace and power generation industries. Developed as a more advanced variant within the Nimonic series, PK33 offers a significant performance increase over alloys like Nimonic 80A and 90, making it suitable for components operating under extreme stress and temperature conditions. #### **2. Chemical Composition (Typical Weight %)** The high-temperature properties of Nimonic PK33 are achieved through a balanced composition of solid-solution strengtheners and precipitation-forming elements. | 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 and grain boundary strength. | | **Boron (B)** | 0.005 max | Enhances grain boundary strength and creep life. | | **Manganese (Mn)**| 0.50 max | Trace element, aids in sulphur control. | | **Silicon (Si)** | 0.50 max | Trace element. | | **Copper (Cu)** | 0.20 max | Impurity control. | | **Iron (Fe)** | 2.0 max | Impurity control. | | **Sulphur (S)** | 0.015 max | Impurity control. | #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.15 g/cm³ (0.294 lb/in³) | | **Melting Range** | ~1330 - 1360 °C (~2425 - 2480 °F) | | **Specific Heat Capacity** | ~ 460 J/kg·K (at 20°C) | | **Thermal Conductivity** | ~ 12.0 W/m·K (at 20°C) | | **Coefficient of Thermal Expansion** | ~ 13.5 μm/m·K (20 - 100°C) | | **Electrical Resistivity** | ~ 1.25 μΩ·m | | **Magnetic Permeability** | Essentially non-magnetic | #### **4. Mechanical Properties (Typical for Bar & Forgings)** Properties are achieved through a full heat treatment cycle: **Solution Treatment + Aging**. * **Room Temperature Tensile Properties (After Heat Treatment):** * **Tensile Strength:** 1200 - 1400 MPa (174 - 203 ksi) * **0.2% Proof Stress:** 800 - 1000 MPa (116 - 145 ksi) * **Elongation:** 15 - 25% * **High-Temperature Capability:** * Nimonic PK33 is designed to retain a high fraction of its room-temperature strength at elevated temperatures. * It exhibits excellent **creep rupture strength** up to approximately **850°C (1560°F)**. * Typical stress for 1000 hours rupture life: ~ **300 MPa** at **750°C**. *(Note: Specific mechanical properties are dependent on product form, size, and the exact heat treatment parameters. Data should be verified with the material producer for critical design.)* #### **5. International Standards & Specifications** Nimonic PK33 is covered by several international and industry-specific standards. | Standard Organization | Standard Designation | Form | | :--- | :--- | :--- | | **Aerospace (SAE/AMS)** | **AMS 5891** | Bar, Forgings, and Rings | | **British Standards (BS)** | **HR 505** (obsolete but referenced) | - | | **European (EN)** | **2.4634** (Material Number) | - | | **Unified Numbering System (UNS)** | **N07041** (Often associated, confirm equivalence) | - | *(It is crucial to consult the latest revision of the relevant standard for procurement.)* #### **6. Product Applications** Nimonic PK33 is used in critical high-stress, high-temperature components, primarily in: * **Aerospace & Gas Turbines:** * Turbine blades and vanes * Turbine disks (forgings) * High-strength fasteners (bolts, nuts) * Shafts and sealing rings * **Power Generation:** * Gas turbine components for stationary power * High-temperature bolting in steam turbines and boilers * **High-Performance Automotive:** * Turbocharger turbines for extreme applications #### **7. Other/Similar Specifications & Alloys** Nimonic PK33 belongs to a family of advanced nickel-based superalloys. Here is a comparison with similar grades: * **Nimonic 105 & Nimonic 115:** Direct competitors within the Nimonic family, with slightly varying compositions of Co, Mo, Ti, and Al, offering comparable performance levels for turbine blades and disks. * **Waspaloy (UNS N07001):** A very well-known alloy with similar applications (disks, blades, fasteners). Waspaloy generally has lower Ti+Al content, resulting in slightly lower tensile strength but excellent overall creep and corrosion balance. * **Udimet 500 / 720:** High-strength superalloys used for similar critical rotating components, often with more complex chemistry for enhanced performance. * **Inconel 718 (UNS N07718):** While Inconel 718 is used for disks and blades, it is strengthened by γ'' phase and is generally used for applications up to ~650°C. PK33 is stronger at temperatures above 700°C. * **Haynes 282:** A more modern superalloy designed for excellent creep strength and fabricability, often seen as a successor for some applications in the 700-800°C range. **Key Differentiator of PK33:** Its balanced composition provides an excellent combination of very high tensile strength, superior creep resistance, and good microstructural stability, making it a top-tier choice for the most demanding rotating and static gas turbine components. --- **Disclaimer:** This data sheet is for informational purposes only. The information is representative and not guaranteed. For specific design and procurement, always consult the official specifications and the material producer's latest data.

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 2193 gallon liquid totes Special package is available on request.