A-286 High Strength Iron-Based Superalloy – Properties, Composition, Heat Treatments and Specifications

A-286 is an age-hardenable iron base superalloy for applications requiring high strength from -320°F up to 1000°F long time, 1300-1500°F short time. Oxidation resistance is high for continuous service to 1500°F, intermittent to 1800°F. Aqueous corrosion resistance is comparable to 316/L stainless.

Applications for A-286

Typical Applications for the A-286 include:

  • Jet engine components
  • High temperature fasteners, springs
  • Non-magnetic cryogenic equipment

Composition of A-286

The composition range for A-286 is provided in table 1.

Table 1. Composition of A-286.

Chemistry, %

Min

Max

Chromium

13.50

16.00

Nickel

24.00

27.00

Molybdenum

1.00

1.50

Cobalt

-

1.00

Vanadium

0.10

0.50

Aluminum

-

0.35

Titanium

1.90

2.35

Boron

0.003

0.010

Carbon

-

0.08

Iron

remainder

Manganese

-

2.00

Silicon

-

1.00

Phosphorus

-

0.025

Sulfur

-

0.025

Specifications

The various forms of A-286 are covered by the following standards:

  • UNS S66286
  • DIN 1.4980

Table 2. Specifications for A-286 iron-based superalloy

Product Form

AMS

G.E.

Plate, sheet, strip, (1800°F Solution Treated)

5525

Sheet, Strip, Plate, Bar

GE B50T1181

Sheet, Strip, Plate, Bar, Forgings

GE B50T12

GE B50T81

Wire, Bars, Forgings, Tubing & Rings (1800°F Solution Treated)

5731

Wire, Bars, Forgings, Tubing & Rings (1800°F Solution Treated plus Aged)

5732

Wire, Bars, Forgings & Tubing (1650°F Solution Treated)

5734

Wire, Bars, Forgings & Tubing (1650°F Solution Treated plus Aged)

5737

Welding Wire

5804

Heat Treatments

Typical heat treatments for A-286 are to solution anneal at either 1650°F 2 hours or 1800°F 1 hour, quench, followed by aging 1325°F for 16 hours, air cool. The 1650°F solution treatment results in a finer grain size and superior short time tensile properties at room and elevated temperatures. A two cycle aging treatment is occasionally specified after the 1650°F solution treatment. This is 1300-1400°F 16 hours air cool plus 1200°F 8-12 hours air cool. It is intended to improve notch rupture strength. The 1800°F solution treatment develops a slightly coarser grain size with superior creep-rupture properties.

Physical Properties of A-286

Density lb/in3

0.286 solution treated

0.287 aged

Melting Range °F

2500-2600

Thermal Properties of A-286

The thermal properties of A-286 are summarised in table 3.

Table 3. Thermal properties of A-286.

Temp

Coeffcient of Thermal Exp.a

Thermal Conductivity

Modulus of Elast, Dynamic

°F

in/in °F x 10-6

Btu. ft/ft2.hr°F

psi x 106

200

9.2

8.0

-

800

9.6

9.8

-

1000

9.8

13.0

23.7

1200

9.9

14.1

21.9

1400

10.3

-

20.1

a 70°F to indicated temperature

Typical Mechanical Properties of A-286

Representative Tensile Properties 1800°F/1325°F heat treat

Table 4. Typical mechanical properties of A-286 superalloy.

Temp

Ultimate Tensile Strength

0.2% Yield Strength

Elong in 2"

Reduction of Area

Charpy V-notch

°F

psi

psi

%

%

ft-lb

RT*

95,000*

50,000*

40*

-

-

RT

145,000

95,000

24

43

-

400

143,000

93,000

21

53

59

800

138,000

93,000

18

35

51

1000

131,000

87,000

18

31

45

1200

103,000

88,000

13

14

35

1400

64,000

62,000

18

23

-

*annealed

Typical Rupture Strength

Table 5. Typical rupture strength of A-286 superalloy after 1800°F/1325°F heat treatment.

Temperature

Stress, psi to Rupture in Indicated Time

°F

100 hrs

1000 hrs

1000

99,000

88,000

1100

81,000

71,000

1200

61,000

46,000

This information has been sourced, reviewed and adapted from materials provided by NeoNickel.

For more information on this source, please visit NeoNickel.

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Comments

  1. Bill Ross Bill Ross United States says:

    Is A286 always non-magnetic?

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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