Iron-Based Super Alloy A-286 - Properties and Applications by United Performance Metals

Topics Covered

Background
Properties of Super Alloy A-286 Sheet and Coil
Chemical Composition of Super Alloy A-286
Physical Properties of A-286
Linear Co-Efficient of Thermal Expansion of A-286
Thermal Conductivity of A-286
Specific Heat of A-286
Magnetic Permeability
Electrical Resistsivity of A-286
Mechanical Properties
Standards

Background

United Performance Metals is a leading supplier of specialty stainless steel and high temperature alloys. In business since 1982, we have experience serving the needs of customers in diverse markets including aerospace, aircraft, automotive, medical, food service, house-wares, and many others.

United Performance Metals stocks a comprehensive inventory of stainless steel sheet, stainless steel coil and stainless steel plate. We are also specialists in high temperature and cobalt alloys including Inconel 625, Inconel 718, A-286, 188 Alloy and L605.

In addition to our comprehensive inventory, we also have complete in-house processing capabilities including leveling, shearing, slitting and edging. When you call, you’ll talk to experienced people who know their business, and yours. Make your life a little easier.

Properties of Super Alloy A-286

Type A-286 alloy (S66286) is an iron-base superalloy useful for applications requiring high strength and corrosion resistance up to 1300°F (704°C) and for lower stress applications at higher temperatures.

Type A-286 alloy is a heat and corrosion resistant austenitic ironbase material which can be age hardened to 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 at least -320°F (-196°C). The alloy may be used for moderate corrosion applications in aqueous solutions.

Type A-286 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. Type A-286 alloy is available in plate, sheet and strip.

Chemical Composition of Super Alloy A-286

Typical chemical analysis of Super Alloy A-286

Element
Percentage
Carbon
0.08 max
Manganese
0.35 max
Phosphorus
0.015 max
Sulfur
0.015 max
Silicon
0.35 max
Chromium
17-21
Nickel
50-55
Molybdenum
2.80-3.30
Columbium
4.75-5.50
Titanium
0.65-1.15
Aluminum
0.20-0.80
Cobalt
1.00 max
Boron
0.006 max
Copper
0.30 max
Tantalum
0.05 max
Iron
Balance

Corrosion and Oxidation Resistance of A-286

Type A-286 alloy content is similar in chromium, nickel, and molybdenum to some of the austenitic stainless steels. Consequently, A-286 alloy possesses a level of aqueous corrosion resistance comparable to that of the austenitic stainless steels. In elevated temperature service, the level of corrosion resistance to atmospheres such as those encountered in jet engine applications is excellent to at least 1300°F (704°C).

Oxidation resistance of A-286 is high for continuous service up to 1500°F (816°C) and intermittent service up to 1800°F (982°C).

Physical Properties of A-286

Typical physical properties of A-286 are summarized in the table below.

 
Solution Treated
Solution Treated and Aged
Density
0.286 lb/in3 (7.92 g/cm3)
0.287 lb/in3 (7.94 g/cm3)
Specific Gravity
7.92
7.94
Melting Range
2500-2600°F
1370-1430°C

Linear Co-Efficient of Thermal Expansion of A-286

The linear co-efficient of thermal expansion for solution treated and aged A-286 is provided below.

Temperature Range
Linear Co-Efficient of Thermal Expansion
(x 10-6)
°C
°F
/°C
/°F
21-93
70-200
16.5
9.17
21-204
70-400
16.8
9.35
21-316
70-600
17.0
9.47
21-427
70-800
17.4
9.64
21-538
70-1000
17.6
9.78
21-649
70-1200
17.8
9.88
21-760
70-1400
18.6
10.32

Thermal Conductivity of A-286

The thermal conductivity at various temperatures for A-286 are given in the following table.

Temperature Range
°C
°F
W/m.K
Btu.ft/ft2.hr.°F
150
302
15.1
8.7
300
572
17.8
10.3
500
932
21.8
12.6
600
1112
23.9
13.8

Specific Heat of A-286

The specific heat of A-286 420 J/kg.K or 0.10 Btu/lb/°F

Magnetic Permeability

The magnetic permeability of A-286 is:

  • Solution treated - 1.010
  • Solution treated and aged - 1.007

Electrical Resistsivity of A-286

Electrical resistivity values as a function of temperature for A-286 are given in the following table.

Temperature Range
micro ohm-cm
°C
°F
25
77
91.0
540
1004
115.6
650
1202
118.8
730
1346
120.1
815
1499
122.4

Mechanical Properties

Type A-286 alloy is formed most easily in the solution treated condition. Typical room temperature tensile properties of A-286 solution treated at 1800°F (982°C) are shown below.

Yield Strength
Ultimate Tensile Strength
Elongation
40,000 psi
90,000 psi
40%
275 MPa
620 MPa

Standards

United Performance Metals A-286 is supplied to AMS 5525 and has the UNS designation S66286

 

For sizes and availability of Inconel 625 contact United Performance Metals.

Source: United Performance Metals

For more information on this source, please visit United Performance Metals

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