Alloy PK33,Nimonic PK33 Forgings,,E FORU

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

### **Product Data Sheet: Alloy PK33 / Nimonic PK33 Forgings (UNS N07041)** **Overview** **Alloy PK33** (commercially known as **Nimonic PK33**) is a high-performance nickel-chromium-cobalt superalloy strengthened by precipitation hardening. In the form of **forgings**, this material delivers **exceptional high-temperature strength, outstanding creep resistance, and superior structural integrity** at temperatures up to 950°C (1740°F). Nimonic PK33 forgings are produced through controlled thermomechanical processes that refine the grain structure, enhance mechanical properties, and ensure metallurgical soundness. The forging process optimizes the alloy's inherent high-temperature capabilities, making it the preferred manufacturing route for critically stressed components in advanced aerospace and power generation 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 | --- #### **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 Condition)** * **Tensile Strength:** 1200-1400 MPa (174-203 ksi) * **Yield Strength (0.2% Offset):** 850-1050 MPa (123-152 ksi) * **Elongation:** 10-20% * **Reduction of Area:** 12-20% **Elevated Temperature Performance** * **Stress Rupture Strength (1000 hours):** * **850°C (1560°F):** ~150 MPa (~22 ksi) * **950°C (1740°F):** ~65 MPa (~9.4 ksi) --- #### **4. Forging Process & Capabilities** **Forging Types:** * **Open-Die Forgings:** For large, simple shapes and pre-forms * **Closed-Die Forgings:** For complex, near-net shapes * **Rolled Rings:** For circumferential components * **Precision Forgings:** For critical rotating components **Forging Temperature Range:** * **Hot Working:** 1050-1150°C (1920-2100°F) * **Solution Treatment:** 1180°C ± 10°C, followed by rapid cooling * **Aging Treatment:** Multi-stage aging for optimal precipitation hardening **Forging Ratios:** * Typical 4:1 to 6:1 for optimal grain refinement * Higher ratios for critical applications --- #### **5. Key Characteristics** * **Superior Structural Integrity:** Forging eliminates porosity and refines grain structure * **Enhanced Mechanical Properties:** Improved strength, ductility, and fatigue resistance * **Optimized Grain Flow:** Grain structure oriented to follow component contours * **Exceptional Creep Resistance:** Maintains mechanical integrity under prolonged stress at extreme temperatures * **Outstanding Oxidation Resistance:** Suitable for continuous service in oxidizing atmospheres up to 950°C * **Thermal Stability:** Retains microstructure and properties during long-term exposure * **Good Machinability:** Can be machined using conventional methods with proper tooling * **Enhanced Fatigue Performance:** Superior resistance to thermal and mechanical fatigue --- #### **6. Product Applications** Nimonic PK33 forgings are specified for the most critically stressed components: * **Aerospace & Gas Turbine Engines:** * **High-pressure turbine blades and vanes** * **Turbine discs and rotors** * **Compressor discs and casings** * **Combustion chamber components** * **Shafts and spindle assemblies** * **Turbine spacers and rings** * **Afterburner components** * **Power Generation:** * **Industrial gas turbine rotor components** * **Turbine wheels and discs** * **High-temperature bolting and fasteners** * **Valve bodies and stems** * **Combustion system components** * **Special Applications:** * **Rocket engine components** * **Nuclear reactor fixtures** * **High-temperature test fixtures** --- #### **7. International Standards** | Standard Type | Standard Number | Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS N07041** | All product forms | | **Aerospace (SAE/AMS)** | **AMS 5805** | Bars, Forgings, and Rings (Solution heat treated, precipitation-hardenable) | | **ASTM** | **ASTM B637** | Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock | | **European** | **EN 10302** | Nickel and cobalt alloys | | **Werkstoff Nr.** | **2.4955** | Material number | | **ISO** | **ISO 9726** | Nickel alloy forgings for aerospace applications | --- #### **8. Quality Assurance** **Testing Requirements:** * Chemical analysis certification * Mechanical properties testing at room and elevated temperatures * Ultrasonic testing per ASTM A388 * Grain size assessment per ASTM E112 * Macro-etch testing * Dye penetrant inspection * Stress rupture testing for critical applications **Certification:** * Material Test Certificate 3.1 per EN 10204 * Full traceability to melt heat number * Heat treatment compliance records * Non-destructive testing reports * Forging process documentation --- **Summary** **Alloy PK33 Forgings (Nimonic PK33, UNS N07041)** represent the premium product form for components demanding the highest levels of strength, reliability, and metallurgical soundness in extreme temperature applications. The forging process imparts a uniform, refined microstructure that is essential for withstanding extreme centrifugal, thermal, and vibratory stresses encountered in advanced jet engine and power turbine cores. Their proven performance under the most severe conditions, governed by strict international standards like AMS 5805 and ASTM B637, makes them a fundamental material for advanced engineering in aerospace and energy sectors. The combination of superior high-temperature properties up to 950°C and optimized forging technology ensures maximum component reliability and service life in the most demanding applications, particularly for rotating components where failure is not an option. Comprehensive quality assurance protocols and strict adherence to OEM specifications guarantee consistent performance and reliability, making Nimonic PK33 forgings the material of choice for critical applications where safety, performance, and longevity are paramount considerations.

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 2192 gallon liquid totes Special package is available on request.