Alloy PK33,Nimonic PK33 Rod,,E FORU

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

### **Product Data Sheet: Alloy PK33 / Nimonic PK33 Rod (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 **rod**, this material delivers **exceptional high-temperature strength, outstanding creep resistance, and superior structural integrity** at temperatures up to 950°C (1740°F). Nimonic PK33 rod is specifically engineered for machining into critical rotating components where dimensional stability, mechanical reliability, and long-term performance under extreme thermal and stress conditions are paramount. The rod form offers optimal machinability in the solution-treated condition while developing maximum strength through subsequent aging treatment. --- #### **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:** 12-22% **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. Product Specifications** **Rod Dimensions:** * **Diameter Range:** 5mm to 300mm (0.2" to 12") * **Length:** Standard random lengths 3-6 meters (10-20 feet) * **Cut lengths available to customer requirements** **Surface Finish:** * Centerless ground * Turned and polished * Black finish * Special surfaces upon request **Straightness Tolerance:** * Standard: 1.5 mm per meter * Precision: 1.0 mm per meter --- #### **5. Key Characteristics** * **Exceptional High-Temperature Strength:** Superior performance up to 950°C * **Outstanding Creep Resistance:** Excellent stress rupture properties * **Excellent Oxidation Resistance:** Extended service life in oxidizing environments * **Optimized Machinability:** Can be machined in solution-annealed condition * **Microstructural Stability:** Maintains properties during long-term exposure * **Good Thermal Fatigue Resistance:** Performs well under thermal cycling conditions * **Consistent Grain Structure:** Uniform properties throughout cross-section --- #### **6. Product Applications** Nimonic PK33 rod is primarily used for machining critical components in extreme temperature environments: * **Aerospace & Gas Turbine Engines:** * **High-pressure turbine blades** * **Turbine vanes and nozzles** * **Rotor discs and spacers** * **Shafts and spindle components** * **Fasteners and bolting** * **Power Generation:** * **Industrial gas turbine blades** * **Turbine discs and shafts** * **High-temperature valve stems** * **Rotor assemblies** * **High-Temperature Tooling:** * **Heat treatment fixtures** * **Hot working tools** * **Specialized manufacturing equipment** --- #### **7. International Standards** | Standard Type | Standard Number | Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS N07041** | All product forms | | **Aerospace (SAE/AMS)** | **AMS 5805** | Bar, Forgings, and Rings (Solution heat treated, precipitation-hardenable) | | **ASTM** | **ASTM B637** | Standard Specification for Precipitation-Hardening Nickel Alloy Bars, Forgings, and Forging Stock | | **British Standard** | **BS HR 8** | Bar and Rod Specifications | | **European** | **EN 10302** | Nickel and cobalt alloys | | **Werkstoff Nr.** | **2.4955** | Material number | --- #### **8. Quality Assurance** **Testing Requirements:** * Chemical analysis certification * Mechanical properties testing at room and elevated temperatures * Ultrasonic testing per ASTM A388 * Grain size assessment * Macro-etch testing **Certification:** * Material Test Certificate 3.1 per EN 10204 * Full traceability to melt heat number * Heat treatment compliance records * Dimensional inspection reports --- **Summary** **Alloy PK33 Rod (Nimonic PK33, UNS N07041)** provides an optimal combination of machinability and extreme temperature performance for critical rotating and structural components. Its exceptional creep strength and oxidation resistance at temperatures up to 950°C make it particularly suitable for high-pressure turbine components and other critically stressed applications in advanced gas turbine engines and power generation equipment. The rod form offers excellent dimensional consistency and metallurgical quality, enabling precision machining of complex components while maintaining the superior properties that make Nimonic PK33 a preferred choice for the most demanding high-temperature applications. Compliance with international standards including AMS 5805, ASTM B637, and BS HR 8 ensures reliable performance in critical aerospace and industrial applications where component reliability and extended service life are paramount. The alloy's balanced machinability and fabricability make it particularly suitable for applications requiring complex machining operations, while its precipitation-hardening characteristics provide exceptional strength for service at extremely elevated temperatures up to 950°C.

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 2184 gallon liquid totes Special package is available on request.