NIMONIC Alloy PK33,Nickel-Chromium Alloy; DTD 5057; AFNOR NC 19 KDu/v，1

### **Product Introduction: NIMONIC® Alloy PK33** **NIMONIC® Alloy PK33** is a precipitation-hardenable nickel-chromium-cobalt superalloy specifically designed for applications requiring exceptional high-temperature strength, outstanding creep resistance, and excellent oxidation resistance. This alloy demonstrates remarkable mechanical properties and microstructural stability at temperatures up to 850°C (1562°F), making it particularly suitable for critical hot-section components in gas turbine engines and other high-temperature engineering applications. The alloy's optimized chemical composition provides an ideal balance between solid-solution strengthening and precipitation hardening through gamma prime (γ') phase formation, while maintaining good fabricability and long-term stability under demanding service conditions. --- ### **Chemical Composition** The chemical composition is precisely controlled to achieve optimal performance characteristics: | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | Balance | | **Chromium (Cr)** | 18.0 - 21.0 | | **Cobalt (Co)** | 16.0 - 21.0 | | **Molybdenum (Mo)** | 3.5 - 5.0 | | **Titanium (Ti)** | 2.5 - 3.2 | | **Aluminum (Al)** | 1.3 - 1.9 | | **Iron (Fe)** | 2.0 max | | **Carbon (C)** | 0.10 - 0.20 | | **Silicon (Si)** | 0.50 max | | **Manganese (Mn)** | 0.50 max | | **Boron (B)** | 0.003 - 0.010 | --- ### **Physical Properties** NIMONIC Alloy PK33 exhibits well-balanced physical properties for high-temperature service: | Property | Value | |----------|-------| | **Density** | 8.18 g/cm³ | | **Melting Point** | 1350-1400 °C | | **Thermal Conductivity** | 12.8 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.28 μΩ·m | | **Modulus of Elasticity** | 225 GPa | | **Coefficient of Thermal Expansion** | 13.7 μm/m·°C (20-800°C) | | **Specific Heat Capacity** | 450 J/kg·K | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties** The alloy demonstrates excellent mechanical performance across its operational temperature range: **Room Temperature Properties (Solution Treated and Aged):** - **Tensile Strength:** 1150-1350 MPa - **Yield Strength (0.2% Offset):** 800-1000 MPa - **Elongation:** 12-20% - **Reduction of Area:** 15-25% - **Hardness:** 34-42 HRC **High-Temperature Performance:** - **Creep Rupture Strength (800°C/100h):** 220 MPa - **Fatigue Strength (750°C):** 300 MPa - **Stress Rupture Life (850°C/150MPa):** >200 hours --- ### **Heat Treatment** **Standard Heat Treatment:** - **Solution Treatment:** 1150-1180°C, 2-4 hours, air cool or faster cooling - **Aging Treatment:** 800-850°C, 8-16 hours, air cool **Special Considerations:** - Two-step aging treatments available for property optimization - Stress relief treatments recommended for complex components --- ### **Key Characteristics & Advantages** 1. **Exceptional High-Temperature Strength** - Superior creep resistance up to 850°C - Excellent retention of mechanical properties during prolonged exposure - Outstanding thermal fatigue resistance 2. **Excellent Environmental Resistance** - Remarkable oxidation resistance up to 1100°C - Good resistance to hot corrosion - Stable protective oxide layer formation 3. **Good Manufacturing Characteristics** - Adequate hot workability - Good machinability in heat-treated condition - Weldable using appropriate techniques (typically requires post-weld heat treatment) 4. **Microstructural Stability** - Resistance to formation of deleterious phases - Stable properties during long-term high-temperature exposure - Consistent and reliable performance --- ### **Product Applications** **Aerospace Industry:** - Turbine blades and vanes - Turbine disks and rotors - Combustion chamber components - Engine fasteners and structural parts **Power Generation:** - Industrial gas turbine components - Turbine disks and blades - High-temperature bolts and fasteners **Industrial Applications:** - High-temperature tooling and dies - Nuclear industry components - High-performance racing components --- ### **International Standards** NIMONIC Alloy PK33 is recognized under the following international specifications: | Standard Type | Standard Number | Description | |---------------|-----------------|-------------| | **DTD** | 5057 | UK Defence Standard | | **AFNOR** | NC 19 KDu/v | French Standard | --- ### **Summary** **NIMONIC Alloy PK33** represents a high-performance precipitation-hardenable nickel-chromium-cobalt superalloy that delivers exceptional strength, creep resistance, and oxidation resistance at temperatures up to 850°C. Its carefully optimized composition makes it particularly suitable for the most demanding hot-section components in aerospace and industrial gas turbines, such as turbine blades and disks. The alloy's ability to maintain mechanical properties and microstructural stability during prolonged high-temperature exposure ensures high reliability and long service life in critical applications. Certification to established standards such as DTD 5057 and AFNOR NC 19 KDu/v guarantees consistent quality and performance, providing engineers with a proven material solution for extreme temperature challenges where performance and reliability are paramount.

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 3322 gallon liquid totes Special package is available on request.