Alloy PK33,Nimonic PK33 Tube,,E FORU

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

### **Product Data Sheet: Alloy PK33 / Nimonic PK33 Tube (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 **tube**, this material delivers **exceptional high-temperature strength, outstanding creep resistance, and superior pressure integrity** at temperatures up to 950°C (1740°F). Nimonic PK33 tubing is precision-engineered for applications requiring reliable performance under combined thermal, pressure, and mechanical stresses. The tubular form maintains the alloy's superior high-temperature characteristics while providing optimal fluid and gas conveyance in the most demanding environments, particularly in advanced aerospace and power generation systems. --- #### **1. Chemical Composition** | Element | Content (%) (Typical) | Role in the Alloy | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Austenitic matrix; provides corrosion resistance and structural integrity | | **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)** * **Tensile Strength:** 1200-1400 MPa (174-203 ksi) * **Yield Strength (0.2% Offset):** 850-1050 MPa (123-152 ksi) * **Elongation:** 10-20% **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. Product Specifications & Types** **Tube Types:** * **Seamless Tubing** - For ultra-high-pressure, high-temperature applications * **Welded and Cold Worked Tubing** - For specific applications * **Heat Exchanger Tubes** - Precision dimensions for thermal efficiency * **Instrumentation Tubing** - Small diameters for sensor and control systems * **Hydraulic Lines** - For extreme-temperature fluid systems **Standard Sizes:** * **Outside Diameter:** 3mm to 150mm (0.125" to 6") * **Wall Thickness:** 0.5mm to 15mm (0.020" to 0.625") * **Tolerances:** To ASTM and AMS specifications **Dimensional Tolerances:** * **OD Tolerance:** ±0.1mm for precision tubes * **Wall Thickness:** ±10% standard, ±5% precision available * **Concentricity:** 90% minimum for critical applications --- #### **5. Key Characteristics** * **Exceptional High-Temperature Strength:** Maintains mechanical properties under extreme thermal cycling and pressure * **Outstanding Creep Resistance:** Withstands prolonged exposure to stress at temperatures up to 950°C * **Excellent Oxidation Resistance:** Protective chromium oxide layer for extended service life * **Pressure Integrity:** Reliable performance in ultra-high-pressure gas and fluid systems * **Thermal Fatigue Resistance:** Superior resistance to thermal cycling and thermal shock * **Good Fabricability:** Can be bent, formed, and welded with proper procedures * **Surface Quality:** Smooth internal and external surfaces for optimal fluid flow and heat transfer * **Microstructural Stability:** Maintains properties during long-term high-temperature exposure --- #### **6. Product Applications** Nimonic PK33 tubing is essential for critical high-temperature systems: * **Aerospace & Gas Turbine Engines:** * **Combustion chamber liners and fuel nozzles** * **Turbine blade cooling passages** * **Heat exchanger components** * **Hydraulic and fuel lines** * **Bleed air systems** * **Afterburner fuel manifolds** * **Power Generation:** * **Advanced gas turbine fuel lines** * **Heat recovery steam generator tubes** * **High-temperature steam lines** * **Turbine cooling systems** * **Supercritical CO2 power cycle components** * **Industrial Processing:** * **Heat treatment furnace components** * **Thermal oil system tubing** * **High-temperature chemical processing equipment** * **Nuclear reactor components** * **Catalyst support tubes** * **Special Applications:** * **Rocket engine components** * **Nuclear fuel cladding** * **High-temperature research equipment** --- #### **7. International Standards** | Standard Type | Standard Number | Description | | :--- | :--- | :--- | | **Unified Numbering System** | **UNS N07041** | All product forms | | **ASTM** | **ASTM B622** | Standard Specification for Seamless Nickel and Nickel Alloy Tube | | **ASTM** | **ASTM B829** | Standard Specification for Seamless Nickel and Nickel Alloy Pipe and Tube | | **Aerospace (SAE/AMS)** | **AMS 5806** | Seamless Tubing | | **European** | **EN 10302** | Nickel and cobalt alloys | | **Werkstoff Nr.** | **2.4955** | Material number | | **ASME** | **SB-622** | ASME Code Case for pressure applications | --- #### **8. Fabrication & Quality Assurance** **Welding & Fabrication:** * **Welding Process:** GTAW (TIG) with matching filler wire * **Heat Treatment:** Full solution and age treatment after welding * **Bending:** Minimum bend radius 2x OD for thin-walled tubes * **Forming:** Hot forming at 1050-1150°C recommended **Quality Assurance:** * Ultrasonic testing per ASTM A388 * Eddy current testing for surface defects * Hydrostatic testing to 1.5x design pressure * Dimensional verification * Surface finish inspection * Full traceability and certification --- **Summary** **Alloy PK33 Tube (Nimonic PK33, UNS N07041)** represents the ultimate solution for high-temperature tubular applications where reliability under extreme conditions is paramount. Its exceptional combination of creep strength, oxidation resistance, and pressure integrity at temperatures up to 950°C makes it indispensable for advanced aerospace propulsion systems, next-generation power generation equipment, and critical industrial processes. The tubing form maintains precise dimensional control and superior surface quality while providing the enhanced high-temperature properties that make Nimonic PK33 a preferred choice for extreme service conditions. Compliance with international standards including ASTM B622, AMS 5806, and ASME specifications ensures consistent quality and performance for the most demanding high-temperature applications. Proper fabrication techniques and comprehensive quality assurance ensure optimal performance throughout the service life of the components, making Nimonic PK33 tube the material of choice for engineers designing systems that must operate reliably under the most severe thermal conditions encountered in modern high-technology applications.

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 2187 gallon liquid totes Special package is available on request.