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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

    • 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.

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