Alloy PK33,Nimonic PK33 Bar(Round bar, Flat bar),,E FORU

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

### **Product Data Sheet: Alloy PK33 / Nimonic PK33 Bar (Round Bar, Flat Bar) (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 **round bar and flat bar**, this material delivers **exceptional high-temperature strength, outstanding creep resistance, and superior structural integrity** at temperatures up to 950°C (1740°F). Nimonic PK33 bar products are manufactured to provide reliable performance in the most demanding high-temperature applications where dimensional stability, mechanical reliability, and long-term performance are critical. Both round and flat bar forms offer excellent machinability and fabrication versatility while maintaining the alloy's superior high-temperature characteristics. --- #### **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 Forms & Specifications** **Round Bar:** * **Diameter Range:** 5mm to 300mm (0.2" to 12") * **Standard Lengths:** 3-6 meters (10-20 feet) * **Tolerance:** h11 for precision applications **Flat Bar:** * **Thickness Range:** 3mm to 150mm (0.12" to 6") * **Width Range:** 10mm to 300mm (0.4" to 12") * **Standard Lengths:** 3-6 meters (10-20 feet) **Surface Condition:** * Centerless ground (round bar) * Turned and polished * Hot-rolled, annealed, and pickled * Machined surfaces available --- #### **5. Key Characteristics** * **Exceptional High-Temperature Strength:** Superior performance up to 950°C * **Outstanding Creep Resistance:** Excellent stress rupture properties under load * **Excellent Oxidation Resistance:** Extended service life in oxidizing environments * **Optimized Machinability:** Can be machined in solution-annealed condition * **Good Thermal Fatigue Resistance:** Performs well under thermal cycling conditions * **Microstructural Stability:** Maintains properties during long-term exposure * **Consistent Grain Structure:** Uniform properties throughout cross-section * **Good Weldability:** Can be welded using appropriate procedures and filler materials --- #### **6. Product Applications** Nimonic PK33 bar products are used for the most critically stressed components in extreme temperature environments: **Round Bar Applications:** * **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 fasteners** * **Valve stems** **Flat Bar Applications:** * **Structural supports and brackets** * **Wear plates and guides** * **Fabrication components** * **Heat treatment fixtures** * **Tooling and die components** * **High-temperature structural elements** **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** | 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 Specifications | | **European** | **EN 10302** | Nickel and cobalt alloys | | **Werkstoff Nr.** | **2.4955** | Material number | --- #### **8. Quality Assurance** **Testing & Certification:** * Chemical analysis certification * Mechanical properties testing at room and elevated temperatures * Ultrasonic testing per ASTM A388 * Grain size assessment * Macro-etch testing * Dimensional inspection **Certification:** * Material Test Certificate 3.1 per EN 10204 * Full traceability to melt heat number * Heat treatment compliance records * Non-destructive testing reports --- **Summary** **Alloy PK33 Bar (Nimonic PK33, UNS N07041)** in both round and flat forms provides an optimal combination of machinability and extreme temperature performance for the most critically stressed 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 bar forms offer excellent dimensional consistency and metallurgical quality, enabling precision machining and fabrication of 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, good weldability, and exceptional high-temperature strength make it particularly suitable for applications requiring complex fabrication operations, while its precipitation-hardening characteristics provide outstanding 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 2185 gallon liquid totes Special package is available on request.