Haynes 282 Nickel Alloy,HAYNES 282 alloy，1

### **Introduction to Haynes® 282® (UNS N07208) Nickel-Based Superalloy** **Haynes® 282®** is a advanced gamma prime (γ') strengthened nickel-based superalloy designed to meet the demanding requirements of next-generation high-temperature applications. It achieves an exceptional balance of three critical properties: **high-temperature creep strength, thermal stability, and fabricability**. Developed in the early 2000s, it fills the performance gap between older alloys like Waspaloy and Alloy 263 and more complex, less fabricable alloys like R-41. A key advantage of Haynes 282 is its excellent creep rupture strength at temperatures ranging from 1200°F to 1800°F (650°C to 1000°C), combined with significantly better weldability and formability than many other high-strength superalloys. --- ### **Chemical Composition (Weight %, typical)** The composition is meticulously balanced to form a stable volume fraction of the γ' strengthening phase [Ni₃(Al, Ti)] while controlling other elements for long-term stability. | Element | Minimum | Maximum | Key Function | | :--- | :--- | :--- | :--- | | **Nickel (Ni)** | **Balance** | | Forms the austenitic (gamma) matrix. | | **Chromium (Cr)** | 19.0 | 21.0 | Provides essential resistance to oxidation and hot corrosion. | | **Cobalt (Co)** | 9.0 | 11.0 | Reduces the stacking fault energy, solid-solution strengthens, and enhances creep strength. | | **Molybdenum (Mo)** | 8.0 | 9.0 | Provides potent solid-solution strengthening in the gamma matrix. | | **Aluminum (Al)** | 1.3 | 1.7 | **Gamma' Former:** Combines with Ni to form the primary strengthening phase, Ni₃Al. | | **Titanium (Ti)** | 2.0 | 2.4 | **Gamma' Former:** Combines with Ni to form Ni₃Ti, co-precipitating with Ni₃Al. | | **Iron (Fe)** | - | 1.5 | Kept low to maintain microstructural stability. | | **Manganese (Mn)** | - | 0.30 | - | | **Silicon (Si)** | - | 0.15 | Kept low to avoid forming low-melting eutectics. | | **Carbon (C)** | 0.05 | 0.10 | Forms primary carbides for grain boundary strengthening. | | **Boron (B)** | 0.003 | 0.008 | Strengthens grain boundaries and improves creep ductility. | | **Sulfur (S)** | - | 0.005 | - | --- ### **Physical Properties (Typical)** * **Density:** 8.69 g/cm³ (0.314 lb/in³) * **Melting Range:** ~1330 - 1365 °C (~2425 - 2490 °F) * **Thermal Expansion Coefficient:** 13.5 μm/m·°C (20-1000°C) * **Thermal Conductivity:** 11.7 W/m·K at 100°C * **Modulus of Elasticity (Young's Modulus):** 224 GPa (32.5 x 10⁶ psi) at 21°C --- ### **Mechanical Properties (Typical)** Haynes 282 requires a two-step aging heat treatment to achieve its optimal properties. **Room Temperature Properties (After Full Heat Treatment):** * **Tensile Strength:** ≥ 1100 MPa (160 ksi) * **Yield Strength (0.2% Offset):** ≥ 800 MPa (116 ksi) * **Elongation:** ≥ 17% **High-Temperature Capability:** * **Creep Rupture Strength:** Excellent; for example, it demonstrates a 1000-hour rupture stress of approximately **110 MPa (16 ksi) at 980°C (1800°F)**. --- ### **Key Characteristics and Product Applications** #### **Key Characteristics:** 1. **Excellent Creep Strength:** Offers superior long-term, load-bearing capability at high temperatures compared to many other fabricable superalloys. 2. **Good Thermal Stability:** Resists the formation of deleterious Topologically Close-Packed (TCP) phases during long-term exposure, which preserves ductility and toughness. 3. **Superior Fabricability:** Exhibits good formability and, most notably, **excellent weldability** with low strain-age cracking susceptibility, a common issue with other γ'-strengthened alloys like Alloy 718. 4. **Oxidation Resistance:** The high chromium content provides adequate oxidation resistance for most industrial gas turbine and aerospace applications. #### **Primary Applications:** Haynes 282 is targeted at the most demanding high-temperature components in aerospace and energy sectors. * **Aerospace & Gas Turbine Engines:** * **Turbine Blades and Vanes (Airfoils)** * **Combustor Liners and Casings** * **Turbine Disks (Rotors)** * **Afterburner Components** * **Industrial Gas Turbines (IGT):** * **Transition Ducts, Combustors, and Nozzles** * **Advanced Energy Systems:** * Components in next-generation nuclear reactors. * **Rocket Engines:** * Nozzles and other hot-gas-path components. --- ### **International Standards** Haynes 282 is now well-established and covered by major aerospace and industrial standards. | Product Form | Standard | Designation | Notes | | :--- | :--- | :--- | :--- | | **Bar, Forgings, Ring** | **AMS 5952** | Haynes 282 Alloy | The primary aerospace material specification for bar and forged shapes. | | **Sheet, Plate, Strip** | **AMS 5912** | Haynes 282 Alloy | Specification for sheet, strip, and plate forms. | | **Welding Wire** | N/A | - | While a specific AWS classification is not yet formalized, matching-composition filler metal **Haynes 282 Welding Wire** is available from the manufacturer. | | **Billet & Bar** | ASTM B637 (Grade UNS N07208) | UNS N07208 | Standard Specification for Nickel-Based Superalloy Bar and Billet. | **Note:** "Haynes" and "282" are registered trademarks of **Haynes International, Inc.** It is a premium, high-performance alloy whose use requires careful consideration of heat treatment and fabrication parameters. Consultation with the manufacturer for specific application engineering is highly recommended.

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 3262 gallon liquid totes Special package is available on request.