Allegheny Ludlum Altemp® A286 Iron-Base Superalloy, UNS S66286

Subcategory: Ferrous Metal; Iron Base; Metal; Stainless Steel; Superalloy

Key Words: AMS 5525; AMS 5858 (Welding Quality)

Component    Wt. % Al 0.15   B 0.006   C 0.04   Cr 14.5   Fe 56

Component    Wt. % Mn 0.2   Mo 1.25   Ni 25   P 0.015

Component    Wt. % S 0.002   Si 0.2   Ti 2.1   V 0.3

Material Notes:
Iron content above calculated as remainder.

Allegheny Ludlum Altemp A286 alloy is an iron-base superalloy useful for applications requiring high strength and corrosion resistance up to 704 degrees Celsius and for lower stress applications at high temperatures. Specific uses include jet engine nacelles, parts, and fasteners. Allegheny Ludlum Altemp A286 alloy is a heat and corrosion resistant austenitic iron-base material which can be age hardened o a high strength level. The alloy is also used for low temperature applications requiring a ductile, non-magnetic high strength material at temperatures ranging from above room temperature down to -196 degrees Celsius. The alloy may be used for moderate corrosion applications in aqueous solutions. This alloy can be produced by AOD refining or vacuum induction melting. Vacuum arc or electroslag remelting procedures may be used to further refine the material.

Information provided by Allegheny Ludlum

Physical Properties	Metric	English	Comments
Density	7.92 g/cc	0.286 lb/in³	Solution Treated
Mechanical Properties
Hardness, Rockwell B	85	85	Typical Annealed
Tensile Strength, Ultimate	620 MPa	89900 psi	Solution Treated (Typical)
Tensile Strength, Yield	275 MPa	39900 psi	Solution Treated (Typical)
Elongation at Break	40 %	40 %	Solution Treated (Typical)
Modulus of Elasticity	201 GPa	29200 ksi	Dynamic
Poisson's Ratio	0.3	0.3
Shear Modulus	77 GPa	11200 ksi
Electrical Properties
Electrical Resistivity	9.1e-005 ohm-cm	9.1e-005 ohm-cm
Magnetic Permeability	1.01	1.01	Solution Treated
Thermal Properties
CTE, linear 20°C	16.5 µm/m-°C	9.17 µin/in-°F	20- 93°C
CTE, linear 250°C	17 µm/m-°C	9.44 µin/in-°F	20- 315°C
CTE, linear 500°C	17.6 µm/m-°C	9.78 µin/in-°F	20-538°C
Specific Heat Capacity	0.42 J/g-°C	0.1 BTU/lb-°F
Thermal Conductivity	15.1 W/m-K	105 BTU-in/hr-ft²-°F	at 150°C
Melting Point	1370 - 1430 °C	2500 - 2610 °F
Solidus	1370 °C	2500 °F
Liquidus	1430 °C	2610 °F
Maximum Service Temperature, Air	816 °C	1500 °F	Continuous service
Maximum Service Temperature, Air	982 °C	1800 °F	Intermittent