Alloy PK33,Nimonic PK33 ,,E FORU

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

### **Product Data Sheet: Alloy PK33 / Nimonic PK33 (UNS N07041)** **Overview** **Alloy PK33** (commercially known as **Nimonic PK33**) is a high-performance nickel-chromium-cobalt superalloy strengthened by precipitation hardening. It is specifically designed for **exceptional high-temperature strength, outstanding creep resistance, and excellent oxidation resistance** at temperatures up to 950°C (1740°F). Developed for advanced gas turbine applications, Nimonic PK33 offers superior mechanical properties and microstructural stability under prolonged exposure to extreme thermal and mechanical stresses, making it suitable for the most demanding aerospace and industrial applications. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Austenitic matrix; provides corrosion resistance and toughness | | **Chromium (Cr)** | 18.0 - 21.0 | Confers oxidation and hot corrosion resistance | | **Cobalt (Co)** | 16.0 - 21.0 | Solid solution strengthener; enhances high-temperature strength | | **Molybdenum (Mo)** | 8.0 - 10.0 | Provides solid solution strengthening and creep resistance | | **Aluminum (Al)** | 1.0 - 2.0 | Precipitation hardener (forms γ' phase, Ni₃Al) | | **Titanium (Ti)** | 2.5 - 3.5 | Primary precipitation hardener; contributes to γ' formation | | **Carbon (C)** | 0.03 - 0.10 | Forms carbides for grain boundary strength | | **Boron (B)** | 0.003 - 0.010 | Strengthens grain boundaries and improves creep life | | **Zirconium (Zr)** | 0.02 - 0.10 | Enhances creep rupture properties | | **Iron (Fe)** | 1.0 max | Residual element | --- #### **2. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.25 g/cm³ (0.298 lb/in³) | | **Melting Range** | 1330 - 1380°C (2425 - 2515°F) | | **Specific Heat** | 440 J/kg·K (0.105 Btu/lb·°F) @ 20°C | | **Thermal Conductivity** | 11.2 W/m·K (77.7 Btu·in/hr·ft²·°F) @ 20°C | | **Mean Coefficient of Thermal Expansion** | 13.1 × 10⁻⁶/°C (20-500°C) | | | 16.5 × 10⁻⁶/°C (20-900°C) | | **Electrical Resistivity** | 1.30 μΩ·m @ 20°C | | **Modulus of Elasticity** | 220 GPa (32.0 × 10⁶ psi) @ 20°C | --- #### **3. Mechanical Properties** **Typical Room Temperature Properties (Heat Treated)** * **Tensile Strength:** 1200-1400 MPa (174-203 ksi) * **Yield Strength (0.2% Offset):** 850-1050 MPa (123-152 ksi) * **Elongation:** 10-20% **Elevated Temperature Capability** * **Creep Rupture Strength (1000 hours):** * **850°C (1560°F):** ~150 MPa (~22 ksi) * **950°C (1740°F):** ~65 MPa (~9.4 ksi) --- #### **4. Key Characteristics** * **Exceptional High-Temperature Strength:** Maintains mechanical properties up to 950°C * **Outstanding Creep Resistance:** Superior stress rupture properties * **Excellent Oxidation Resistance:** Performs well in oxidizing atmospheres * **Good Thermal Fatigue Resistance:** Withstands thermal cycling conditions * **Microstructural Stability:** Maintains properties during long-term exposure * **Optimized for Gas Turbine Applications:** Specifically developed for turbine components --- #### **5. Product Applications** Nimonic PK33 is primarily used in critical high-temperature components: * **Aerospace & Gas Turbine Engines:** * **High-pressure turbine blades** * **Turbine vanes and nozzles** * **Rotor discs and spacers** * **Combustion chamber components** * **Afterburner parts** * **Power Generation:** * **Industrial gas turbine blades** * **Turbine discs and shafts** * **High-temperature fasteners** * **Combustion system components** * **High-Temperature Tooling:** * **Heat treatment fixtures** * **Hot working tools** * **Specialized manufacturing equipment** --- #### **6. International Standards** | Standard Type | Standard Number | Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS N07041** | All product forms | | **Aerospace (SAE/AMS)** | **AMS 5805** | Bar, forgings, and rings | | **British Standard** | **BS HR 8** | Sheet, strip, and plate | | **European** | **EN 10302** | Nickel and cobalt alloys | | **Werkstoff Nr.** | **2.4955** | Material number | --- #### **7. Heat Treatment** **Solution Treatment:** * 1180°C ± 10°C, followed by rapid cooling **Aging Treatment:** * 1050°C ± 10°C, 4 hours, air cool * 850°C ± 10°C, 16 hours, air cool * 700°C ± 10°C, 16 hours, air cool --- **Summary** **Alloy PK33 (Nimonic PK33, UNS N07041)** represents an advanced class of nickel-based superalloys optimized for the highest temperature applications in modern gas turbine engines and power generation equipment. Its enhanced composition provides superior creep strength and oxidation resistance compared to earlier generations, making it particularly suitable for high-pressure turbine blades and other critically stressed components operating at extreme temperatures. The alloy's compliance with major international standards including AMS 5805 and BS HR 8 ensures consistent quality and reliability for critical aerospace and industrial applications. With proven performance in extreme temperature environments and extensive documentation of service behavior, Nimonic PK33 continues to be a preferred choice for applications demanding maximum temperature capability and extended service life in the most severe operating conditions.

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 2183 gallon liquid totes Special package is available on request.