520 Nickel Superalloy,GGC-0005, GGC-1005.,E FORU

### **Product Introduction: Alloy 520 Nickel-Based Superalloy (GGC-0005, GGC-1005)** **Alloy 520** is a high-strength, precipitation-hardenable nickel-based superalloy specifically designed for investment casting to produce complex components that must withstand extreme mechanical stresses and high temperatures. It is renowned for its exceptional combination of high tensile strength, superior creep resistance, and excellent oxidation resistance up to approximately 1800°F (980°C). This alloy is primarily used in the most demanding sections of gas turbine engines, where its ability to retain properties under sustained load at elevated temperatures is critical. The specifications **GGC-0005** and **GGC-1005** are proprietary casting specifications, often from manufacturers like General Electric, which dictate the precise chemical, mechanical, and quality requirements for components. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of Alloy 520 is tightly controlled to achieve its desired microstructure and properties. | Element | Content (%) | Element | Content (%) | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | **Tungsten (W)** | 9.00 - 12.00 | | **Chromium (Cr)** | 17.00 - 21.00 | **Molybdenum (Mo)** | 8.00 - 10.00 | | **Cobalt (Co)** | 10.00 - 13.00 | **Aluminum (Al)** | 1.70 - 2.30 | | **Titanium (Ti)** | 1.70 - 2.30 | **Tantalum (Ta)** | 0.70 - 1.30 | | **Carbon (C)** | 0.08 - 0.15 | **Zirconium (Zr)** | 0.03 - 0.08 | | **Boron (B)** | 0.005 - 0.015 | **Iron (Fe)** | ≤ 1.00 | | **Manganese (Mn)**| ≤ 0.40 | **Silicon (Si)** | ≤ 0.40 | **Key Microstructure:** The high-temperature strength of Alloy 520 is derived from a high volume fraction of the ordered gamma prime (γ') phase, Ni₃(Al, Ti). The combined Aluminum and Titanium content drives the formation of this primary strengthening phase. Elements like Tungsten, Molybdenum, and Cobalt provide solid-solution strengthening, while Carbon, Boron, and Zirconium enhance grain boundary strength and creep resistance. --- #### **2. Physical Properties** Typical physical properties for Alloy 520 in the cast and heat-treated condition are provided below. | Property | Metric Units | Imperial Units | | :--- | :--- | :--- | | **Density** | 8.55 g/cm³ | 0.309 lb/in³ | | **Melting Range** | ~1260 - 1360 °C | ~2300 - 2480 °F | | **Thermal Conductivity (20°C)** | 10.5 W/m·K | 72.8 Btu·in/hr·ft²·°F | | **Mean Coefficient of Thermal Expansion (20-1000°C)** | 14.2 μm/m·°C | 7.9 μin/in·°F | | **Modulus of Elasticity (Tensile)** | 216 GPa | 31.3 x 10⁶ psi | --- #### **3. Mechanical Properties (Typical for Heat-Treated Condition)** Mechanical properties are developed through a standard precipitation hardening heat treatment, typically involving a high-temperature solution treatment followed by one or more aging steps. **Common Heat Treatment:** * **Solution Treat:** ~2150°F (1177°C), rapid cool. * **Aging:** ~1550°F (843°C) for 4 hours, air cool. **Typical Mechanical Properties (At Room Temperature):** | Property | Value (Typical) | | :--- | :--- | | **Tensile Strength** | 1240 MPa (180 ksi) | | **Yield Strength (0.2% Offset)** | 1035 MPa (150 ksi) | | **Elongation** | 8% | | **Reduction of Area** | 12% | **Typical Elevated Temperature Properties (At 1400°F / 760°C):** | Property | Value (Typical) | | :--- | :--- | | **Tensile Strength** | 895 MPa (130 ksi) | | **Yield Strength (0.2% Offset)** | 760 MPa (110 ksi) | | **Stress Rupture (1400°F / 760°C @ 480 MPa / 70 ksi)** | 40+ hours | --- #### **4. International Standards & Specifications** Alloy 520 is predominantly governed by proprietary specifications from original equipment manufacturers (OEMs), particularly in the aerospace sector. **Primary Specifications:** * **GGC-0005:** A General Electric Company material specification for investment castings of this alloy, typically covering the standard composition and heat treatment. * **GGC-1005:** Another GE specification, which may denote a specific version with modified processing or inspection requirements. **Other/Related Standards:** * **AMS:** While not as common as proprietary specs, it may be produced under specific AMS guidelines for premium-quality castings. * **UNS:** While not officially designated, it is often associated with the industry-recognized name "Alloy 520". * **OEM Specs:** Widely used under other engine manufacturers' internal specifications (e.g., Rolls-Royce, Pratt & Whitney). --- #### **5. Product Applications** Alloy 520's primary application is in the static and rotating hot sections of gas turbine engines where high strength and creep resistance are paramount. * **Aerospace & Gas Turbines:** * **Turbine Blades and Vanes** * **Turbine Shrouds and Segments** * Combustion chamber components * Nozzle guide vanes * Other critical static structural parts * **Industrial Gas Turbines (IGT):** * Blades, vanes, and other hot-gas-path components for land-based power generation turbines. --- #### **Summary of Key Advantages** * **Exceptional High-Temperature Strength:** Offers superior tensile, yield, and creep-rupture properties, making it suitable for the most highly stressed components. * **Excellent Microstructural Stability:** Maintains its gamma prime structure and mechanical properties under long-term exposure to high temperatures. * **Superior Oxidation Resistance:** The high Chromium content provides good resistance to oxidation and hot gas corrosion. * **Optimized for Casting:** Its composition is tailored for investment casting, allowing the production of complex, near-net-shape parts with the required performance. **Disclaimer:** The information provided here is for reference purposes. Alloy 520 is a highly specialized casting alloy where properties and performance are critically dependent on the precise foundry processes, heat treatment, and quality controls mandated by the governing specifications (GGC-0005/GGC-1005). For all applications, compliance with the official OEM specifications and the processor's data sheets is mandatory.

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 3135 gallon liquid totes Special package is available on request.