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Stainless Steel - Grade A286/1.4980
Description
A286/1.4980 is an iron-based superalloy, also known as UNS S66286, designed for high strength and good corrosion resistance at elevated temperatures, specifically up to 1300°F (704°C). It is an austenitic alloy that can be precipitation hardened, making it suitable for various high-temperature applications, including jet engines and gas turbines.
Chemical Composition
- Carbon (C): 0.04 - 0.08%
- Chromium (Cr): 14.5 - 15.5%
- Manganese (Mn): 0.20 - 2.00%
- Silicon (Si): 0.20%
- Nickel(Ni): 14.5 - 15.5%
- Molybdenum (Mo): 14.5 - 15.5%
- Phosphorus (P): 0.015%
- Sulfur (S): 0.002%
- Titanium (Ti): 2.0 - 2.5%
- Aluminum(Al): 0.15%
- Iron(Fe): Balance
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Mechanical Properties
The mechanical properties of A286 vary based on heat treatment but typically include:
- Ultimate Tensile Strength: 90,000 psi (620 MPa)
- Yield Strength: 40,000 psi (275 MPa)
- Elongation: 40%
Thermal & Physical Properties
- Density: 0.2860 lb/in³
- Melting Point: 1425 - 1460°C
- Thermal Conductivity: 104.2 BTU-in/hr/ft²/°F at 302°F
- Mean Coefficient of Thermal Expansion:
- 200°F: 9.17 x 10⁻⁶ in/in/°F
- 600°F: 9.47 x 10⁻⁶ in/in/°F
- Mean Specific Heat: 0.1100 Btu/lb/°F (from 104°F to 1299°F)
Other Designations
- AISI Number: 660
- DIN:1.4980
Fabrication and Heat Treatment
A286 can be processed through various methods, including:
- Hot Working: Typically performed between 1900°F to 2050°F (1038°C to 1121°C). It should not be forged below 1700°F (927°C).
- Cold Working: Can be satisfactorily cold drawn and formed in the solution-treated condition.
- Heat Treatment: Solution annealing at 1800°F (982°C) followed by aging at 1325°F (719°C) for optimal mechanical properties.
Applications
A286 is widely used in:
- Jet engines and gas turbines (e.g., turbine wheels and blades)
- Supercharger components
- High-temperature fasteners
- Automotive exhaust systems (e.g., exhaust valves and manifold fasteners)
Supplied Forms
A286 is available in various forms, including:
- Round bars (AMS 5731, AMS 5732, AMS 5737)
- Coils (AMS 5525, AMS 5858)
Features
- Excellent oxidation resistance up to 1500°F (816°C) and intermittent service up to 1800°F (982°C).
- High ductility and strength retention at elevated temperatures.
- Good machinability compared to other nickel-based alloys, although it is more challenging than standard stainless steels.
This datasheet provides a comprehensive overview of the A286 grade bar, highlighting its properties, applications, and specifications relevant for engineering and manufacturing contexts.