Stainless Steel Grade A286 (UNS S66286)

Stainless steel A286 is a heat and corrosion resistant austenitic iron-base material that can be age hardened to a high strength level. It is designed for use at temperatures up to 704°C (1300°F) where good corrosion resistance, excellent creep strength and high tensile strength are required. The alloy can also be used for low temperature applications that require a ductile, non-magnetic high strength material at temperatures below room temperature.

Chemical Composition

The chemical composition of Grade A286 stainless steel is outlined in the following table.

Element Content (%)
Nickel, Ni 24-27
Chromium, Cr 13.5-16
Columbium, Nb 4.75-5.50
Molybdenum, Mo 1-1.5
Cobalt, Co 1 max
Titanium, Ti 1.9-2.35
Silicon, Si 1 max
Manganese, Mn 2 max
Copper, Cu 0.30 max
Aluminum, Al 0.35 max
Carbon, C 0.08 max
Tantalum, Ta 0.05 max
Boron, B 0.003-0.01
Phosphorus, P 0.025 max
Sulfur, S 0.025 max
Iron, Fe Balance

Mechanical properties

The mechanical properties of Grade A286 stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength 620 MPa 90000 psi
Yield strength 275 MPa 40000 ksi
Elongation at break 40% 40%

Manufacturing process

Generally, high temperature alloyshigh-temperature alloys are difficult to machine than stainless steels. However, stainless steel A286, an iron-base alloy group iron base alloy is easier to machine than the nickel-based precipitation-hardening gradesthe nickel-based precipitation-hardening grades. Carbon insert tools are commonly used for machining this alloy. Although A286 alloy is harder than other stainless steels, it can be satisfactorily cold drawn and formed. It can be work-hardened rapidly. Forging of this alloy can be performed at temperatures ranging from 1038 to 1121°C (1900 to 2050°F temperature).

A286 alloy can also be produced by argon oxygen decarburization or vacuum induction melting. Vacuum arc or electroslag remelting techniques may be used to refine the alloy.

Applications

The following are some of the major applications of Grade A286 stainless steel:

  • Aircraft and industrial gas turbine
  • Flange nuts
  • Super-charger components
  • Jet engines blades
  • Castings
  • Frames and fasteners
  • Sockets
  • Screws
  • Afterburner parts.

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