Alloy PK33,Nimonic PK33 Fittings,,E FORU

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

### **Product Data Sheet: Alloy PK33 / Nimonic PK33 Fittings (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 **fittings**, this material delivers **exceptional high-temperature strength, outstanding creep resistance, and reliable performance** in high-temperature piping and tubing systems operating up to 950°C (1740°F). Nimonic PK33 fittings are precision-manufactured to ensure leak-proof connections and long-term reliability in extreme thermal environments. These components maintain structural integrity under combined thermal, pressure, and mechanical stresses, making them essential for critical high-temperature fluid and gas handling systems 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 ductility | | **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% **Pressure Rating:** * **Maximum Working Pressure:** Temperature-dependent design * **Burst Pressure:** Typically 3-4 times maximum working pressure * **Design Standards:** ASME B31.1, B31.3 applicable --- #### **4. Product Types & Specifications** **Fitting Types Available:** * **Butt-Weld Fittings:** Elbows (45°, 90°, 180°), tees, reducers, caps * **Socket-Weld Fittings:** Unions, elbows, tees, couplings * **Threaded Fittings:** Nipples, couplings, adapters, plugs * **Flanged Components:** Special high-temperature flanges * **Special Fittings:** Custom configurations for specific applications **Size Range:** * **Butt-Weld:** 1/2" to 12" NB (Nominal Bore) * **Socket-Weld:** 1/8" to 2" NB * **Threaded:** 1/8" to 2" NB * **Flanges:** 1/2" to 12" NB **Standards Compliance:** * ASME B16.9, B16.11, B16.28 * MSS SP-43, SP-97 * DIN 2605, 2615, 2616 * Customer-specific specifications --- #### **5. Key Characteristics** * **Exceptional High-Temperature Strength:** Superior performance up to 950°C * **Outstanding Creep Resistance:** Excellent stress rupture properties under pressure * **Excellent Oxidation Resistance:** Extended service life in oxidizing environments * **Pressure Integrity:** Reliable performance in ultra-high-pressure systems * **Thermal Fatigue Resistance:** Superior performance under thermal cycling conditions * **Good Weldability:** Can be welded using GTAW with matching filler metal * **Microstructural Stability:** Maintains properties during long-term exposure * **Dimensional Accuracy:** Precision machining for perfect fit-up --- #### **6. Product Applications** Nimonic PK33 fittings are essential for critical high-temperature piping systems: * **Aerospace & Gas Turbine Engines:** * **High-pressure fuel system components** * **Hot gas path connections** * **Exhaust system manifolds** * **Afterburner fuel piping systems** * **Turbine cooling system connections** * **Bleed air ducting systems** * **Power Generation:** * **Advanced gas turbine fuel systems** * **High-temperature steam line connections** * **Heat recovery system piping** * **Turbine bypass systems** * **Superheater and reheater connections** * **Combustion system components** * **Industrial Processing:** * **High-temperature chemical processing systems** * **Heat treatment furnace piping networks** * **Thermal oil system connections** * **Pyroprocessing gas handling systems** * **Reactor and vessel connections** * **Nuclear Applications:** * **Advanced reactor systems** * **High-temperature gas-cooled reactor systems** * **Nuclear process piping connections** --- #### **7. International Standards** | Standard Type | Standard Number | Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS N07041** | All product forms | | **ASTM** | **ASTM B366** | Standard Specification for Factory-Made Wrought Nickel Alloy Fittings | | **ASTM** | **ASTM B462** | Standard Specification for Forged or Rolled Nickel Alloy Pipe Flanges | | **Aerospace (SAE/AMS)** | **AMS 5805** | Bar and Forging Stock (Base material for fittings) | | **European** | **EN 10253** | Butt-welding pipe fittings | | **Werkstoff Nr.** | **2.4955** | Material number | | **ASME** | **SB-366** | ASME Code Case for pressure applications | --- #### **8. Fabrication & Quality Assurance** **Manufacturing Processes:** * Hot forging and machining * Precision investment casting * Cold forming for specific configurations * Full heat treatment after forming **Welding Requirements:** * **Process:** GTAW (TIG) preferred * **Filler Metal:** Matching composition or AWS A5.14 ERNiCrMo-XX * **Preheat:** Generally not required * **Post-Weld Heat Treatment:** Full solution and age treatment recommended **Quality Assurance:** * Dimensional verification * Liquid penetrant testing * Radiographic examination (for critical applications) * Pressure testing * Material certification * Heat treatment records --- **Summary** **Alloy PK33 Fittings (Nimonic PK33, UNS N07041)** represent the ultimate solution for high-temperature, high-pressure piping systems where reliability and performance are absolutely critical. Their exceptional creep strength, oxidation resistance, and pressure containment capability at temperatures up to 950°C make them indispensable for advanced aerospace propulsion systems, next-generation power generation equipment, and demanding industrial processes. The fittings are precision-manufactured to ensure perfect fit-up and long-term reliability while providing the superior high-temperature properties that make Nimonic PK33 a preferred choice for extreme service conditions. Compliance with international standards including ASTM B366, ASME SB-366, and EN 10253 ensures consistent quality and reliability for the most demanding high-temperature applications. Proper manufacturing techniques, comprehensive quality assurance, and strict adherence to welding procedures ensure optimal performance throughout the service life of the piping system, making Nimonic PK33 fittings the preferred choice for engineers designing systems that must operate reliably under the most severe thermal and pressure 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 2191 gallon liquid totes Special package is available on request.