Incoloy A-286 (UNS S66286)

Incoloy A-286 provides outstanding corrosion resistance and high strength properties
essential for industrial applications up to 1300oF. It maintains good mechanical strength
properties even at the extremely low temperatures to -196oC. Outstanding oxidation and
heat resistance. Alloy A286 is employed in jet engines and spacejet parts.

Alloy A-286 is easily age hardenable to achieve good mechanical characteristics. It retains its
high strength and resistance to oxidation at the elevated temperature ranges up to 1300oF
or 700oC. It is an austenitic alloy in the metallurgical conditions.

Applications
The excellent potential and formation features of Incoloy A-286 make it purposeful in the
variety of applications of aerospace and land based gas turbines that are used on the
commercial scale. It is also used in the fastener operations in the automotive engine and
diverse components for high levels of heat and pressure, sea water, oil and gas applications.

Chemical Composition

Nickel (Ni) 24 to 27 %

Iron (Fe) 56.5 %

Chromium (Cr) 13.5 to 16 %

Molybdenum (Mo) 1 to 1.50 %

Titanium (Ti) 1.75 to 2.30 %

Carbon © 0.08 %

Manganese (Mn) 2%

Silicon (Si) 1%

Vanadium (V) 0.10 to 0.50 %

Aluminium (Al) 0.35 %

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 Boron (B) 0.003 to 0.010 %
Physical Properties

Density 7.94 g/cm3 or 0.287 lb/inch3

Melting Point 1430oC or 2600oF
Modulus of Rigidity 71.5 kN/mm2 or 10370 ksi
Modulus of elasticity 205 kN/mm2 or 29773 ksi
Highest application 816oC or 1500oF
temperature 982oC or 1800oF
Melting Point 1370oC to 1430oC or 2500oF to 2610oF
Solidus point 1370oC or 2500oF
Liquidus point 1430oC or 2610oF
Thermal conductivity 15.1 W/m-K at temperature 150oC or 105 BTU-in/hr-ft²-°F at 302oF
Specific heat capacity 0.420 j/g-oC or 0.100 BTU/lb-oF
Linear coefficient of thermal 16.5 micro-m/moC at 20 to 93oC or 9.17 micro-inch/inch-oF from 68 to 199oF
expansion 17 micro-m/moC from 20 to 315oC or 94 micro-inch/inch-oF from 68oF to 599oF
17.6 micro-m/moC at 20oC to 538oC or 9.78 micro-inch/inch-oF from 68 to 1000oF
Magnetic permeability 1.01
Electrical Resistivity 0.0000910 ohm-cm
Hardness, Rockwell B 85
Tensile Strength, Ultimate 620 Mpa or 89900 psi
Yield strength 275 Mpa or 39900 psi
Elongation % 40 %
Modulus of elasticity 201 GPa or 29200 ksi
Poisson ratio 0.30
Shear Modulus 77 GPa or 11200 ksi

Modulus of Elasticity
Temperature X 10(6) psi X 10(3) MPa
oF oC
70 oF 21.1 oC 28.8 X 10(6) psi 199 X 10(3) MPa
1000 oF 538 oC 23.7 X 10(6) psi 163 X 10(3) MPa
1100 oF 593 oC 22.8 X 10(6) psi 157 X 10(3) MPa
1200 oF 649 oC 21.9 X 10(6) psi 151 X 10(3) MPa
1300 oF 704 oC 21.1 X 10(6) psi 145 X 10(3) MPa
1400 oF 760 oC 20.1 X 10(6) psi 139 X 10(3) MPa
1500 oF 816 oC 18.7 X 10(6) psi 129 X 10(3) MPa

Mean Coefficient of thermal expansion

Temperature Per oF Per oC
200 oF 93 oC 9.17 x 10(-6) per oF 16.5 x 10(-6) per oC
400 oF 204 oC 9.35 x 10(-6) per oF 16.8 x 10(-6) per oC
600 oF 316 oC 9.47 x 10(-6) per oF 17 x 10(-6) per oC
800 oF 427 oC 9.64 x 10(-6) per oF 17.4 x 10(-6) per oC
1000 oF 538 oC 9.78 x 10(-6) per oF 17.6 x 10(-6) per oC
1200 oF 649 oC 9.88 x 10(-6) per oF 17.8 x 10(-6) per oC
1300 oF 704 oC 9.94 x 10(-6) per oF 17.9 x 10(-6) per oC

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 1400 oF 760 oC 10.32 x 10(-6) per oF 18.6 x 10(-6) per oC

Mechanical Properties
Temperature .02 % Yield strength 0.2 % Yield strength Tensile strength Elongati Reduction
oF oC Ksi Mpa Ksi Mpa Ksi Mpa on % area %
70 oF 21.1 oC 90 Ksi 621 Mpa 95 Ksi 655 Mpa 145 Ksi 1000 Mpa 24 % 45 %
400 oF 204 oC 76 Ksi 524 Mpa 93.5 Ksi 645 Mpa 143 Ksi 986 Mpa 21.5 % 52 %
800 oF 427 oC 72 Ksi 496 Mpa 93 Ksi 641 Mpa 138 Ksi 951 Mpa 18.5 % 35 %
1000 oF 538 oC 62 Ksi 427 Mpa 87.5 Ksi 603 Mpa 131 Ksi 903 18.5 % 31 %
1100 oF 593 oC 64.5 Ksi 445 Mpa 90 Ksi 621 Mpa 122 Ksi 841 Mpa 21 % 23 %
1200 oF 649 oC 62.5 Ksi 431 Mpa 88 Ksi 607 Mpa 103.5 Ksi 714 Mpa 13 % 14.5 %
1300 oF 704 oC 68.5 Ksi 472 Mpa 86 Ksi 593 Mpa 86.5 Ksi 596 Mpa 11 % 10 %
1400 oF 760 oC 44.5 Ksi 307 Mpa 62 Ksi 427 Mpa 64 Ksi 441 Mpa 18.5 % 23 %
1500 oF 816 oC 31 Ksi 214 Mpa 33 Ksi 228 Mpa 36.5 Ksi 252 Mpa 68.5 % 37.5 %
Stress rupture properties

Temperature Stress required for rupture

oF oC 100 hours % 1000 hours %
Ksi Mpa elongation Ksi Mpa elongation
in 3D in 4D
1000 oF 538 oC 99 Ksi 683 Mpa 3% 88 Ksi 607 Mpa 3%
1100 oF 593 oC 81.5 Ksi 562 Mpa 3% 71.5 Ksi 493 Mpa 3%
1200 oF 639 oC 61 Ksi 421 Mpa 5% 46 Ksi 317 Mpa 8.5 %
1300 oF 704 oC 44.5 Ksi 307 Mpa 12 % 29 Ksi 200 Mpa 30 %
1350 oF 732 oC 35 Ksi 41 Mpa 29 % 21 Ksi 145 Mpa 35 %
1500 oF 816 oC 13 Ksi 90 Mpa 55 % 7.7 Ksi 53 Mpa -

Corrosion Resistance

The resistance to corrosion offered by Incoloy A-286 alloy is due to the concentration of
nickel and chromium. It is superiorly resistant to oxidation and corrosion. The alloy offers
excellent resistance to oxidation at the operation temperatures of 1300oF or 700oC.

Fabrication
Incoloy A-286 is easily fabricated by following the regular processes that are used for
stainless steel and nickel alloy formation. The cold processing is performed on the specimen
in the solution processed condition. The processes, forces and work toughening rates are
equivalent to the Inconel 600 and Incoloy 800.

For hot formation, alloy A-286 is heated at 2100oF or 1150oC. The ultimate reductions at
temperature of 1800oF or 980oC must be more than 10% to restrict the large grain
formation in the solution processing. The formation process is not performed at
temperatures lower than 1700oF or 930oC. The heat processing of Incoloy A-286 alloy is
done at 1800oF or 980oC or 1650oF or 900oC, followed by the frequent cooling by age
hardening for continuous 16 hours at temperature of 1325oF or 720oC and then air
quenching is performed.

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The solution processing at 1800oF offers maximum creeping resistance in the age
toughened alloy A-286 although work processing at 1650oF offers enhanced ductility and
room temperature tensile properties.

Available Forms
Wire, mesh, strip, pipe, tubing, bar, rod, flanges, sheet, plate, foil

Heanjia Super-Metals Co., Ltd, Call- 12068907337. Web: www.super-metals.com