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. %
Al0.15 
B0.006 
C0.04 
Cr14.5 
Fe56 
Component   Wt. %
Mn0.2 
Mo1.25 
Ni25 
P0.015 
Component   Wt. %
S0.002 
Si0.2 
Ti2.1 
V0.3 

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 PropertiesMetricEnglishComments
Density7.92 g/cc0.286 lb/in Solution Treated

Mechanical Properties
Hardness, Rockwell B8585 Typical Annealed
Tensile Strength, Ultimate620 MPa89900 psi Solution Treated (Typical)
Tensile Strength, Yield275 MPa39900 psi Solution Treated (Typical)
Elongation at Break40 %40 % Solution Treated (Typical)
Modulus of Elasticity201 GPa29200 ksi Dynamic
Poisson's Ratio0.30.3 
Shear Modulus77 GPa11200 ksi 

Electrical Properties
Electrical Resistivity9.1e-005 ohm-cm9.1e-005 ohm-cm 
Magnetic Permeability1.011.01 Solution Treated

Thermal Properties
CTE, linear 20C16.5 m/m-C9.17 in/in-F 20- 93C
CTE, linear 250C17 m/m-C9.44 in/in-F 20- 315C
CTE, linear 500C17.6 m/m-C9.78 in/in-F 20-538C
Specific Heat Capacity0.42 J/g-C0.1 BTU/lb-F 
Thermal Conductivity15.1 W/m-K105 BTU-in/hr-ft-F at 150C
Melting Point1370 - 1430 C2500 - 2610 F 
Solidus1370 C2500 F 
Liquidus1430 C2610 F 
Maximum Service Temperature, Air816 C1500 F Continuous service
Maximum Service Temperature, Air982 C1800 F Intermittent


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