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Super Alloy A-286 Steel - UNS S66286

A-286 stainless steel (UNS S66286) is a precipitation hardening alloy that combines high strength and good corrosion resistance at temperatures up to 1300f (704c). The super alloy a286 is an iron-based high temperature, high strength alloy with machinability is similar in behavior to the stainless steel 300 series. Super alloy a-286 is suitable for both heavy (1850 - 2200°F) and light forgings (1600 - 1850°F). Shapes of a286 forgings include flat, round and square bars, rolled rings, disks, hollows and more. Contact Anderson Shumaker today to speak to an alloy a286 stainless steel specialist.

Applications: Aircraft engines, power generation, turbine blading, afterburner parts and other environments in oxidizing environments.

Heat Treatment: Solution heat treatment, two methods are suggested.

Heat to 1800f (982c) and hold at heat for one hour then rapid cool.

Second option is heat to 1650f (899c) hold for 2 hours then rapid cool.

The first heat treat is better for stress rupture strength after aging while the second option results in higher hardness and better ductility.

Aging: typical aging for A-286 steel/UNS S66286 is heat to 1300/1400f (704/760c) hold 12 to 16 hours at heat then air cool to approximate 300 BHN.

An alternate two cycle aging can be used to improve notch stress rupture when using the 1650 solution treat option. Heat to 1300/1400f (704/760c) hold at heat for 16 hours then air cool. Then heat to 1200f (649c) hold 8 to 12 hours and air cool.

Super Alloy A286 Chemistry Analysis
Carbon max 0.08% Manganese max 2.00%
Titanium   1.90-2.30% Aluminum max 0.035%
Silicon max 1.0% Chromium   13.50 - 16.00%
Nickel   24.00-27.00% Vanadium   0.10-0.50%
Boron   0.003-0.010% Molybdenum   1.00-1.50%
Iron   Balance      

Corrosion Resistance for Super Alloy A-286 Stainless Steel

The following table is for reference only, many factors can affect the corrosive resistance for a286 steel, a corrosion test for each application should be applied.

Phosphoric acid Moderate Acetic Acid Good
Sodium Hydroxide Moderate Sea Water Moderate
Salt Spray Good Nitric Acid Good
Sulfuric Acid Moderate Humidity Excellent
Sour oil/gas Moderate    

Typical Room Temperature Tensile properties

Solution treated 1800f (982c) for one hour and oil quenched, aged 1325f (719c) 16 hours and air cooled.
Test Temperature Yield 0.2% Yield 0.2% Yield 0.2% Yield 0.2% Tensile Strength % Elongation in 2" {50.8mm} % Reduction of Area
          0.2% offset 0.2% offset    
f/c ksi mpa ksi Mpa ksi Mpa    
70/21 90 621 92 655 145 1000 24 45
400/204 76 524 93 645 143 986 21 52
800/427 72 496 93 641 138 951 19 35
1000/538 62 427 87 603 131 903 18 31
1100/593 64 445 90 621 122 841 21 23
1200/649 62 431 88 607 103 713 13 14
1300/704 68 472 86 593 86 595 11 10
1400/760 44 307 62 427 64 441 18 23
1500/816 31 214 33 228 36 251 19 17
Machinability:
A-286 stainless steel will machine easier than other high temperature metals, such as 718. Using carbide inserts will help. Similar behavior to the austenitic stainless steels.
Specifications:
AMS 5731, AMS 5732, AMS 5734, AMS 5737, AMS 5895, ASTM A638, Elliott Turbine, MS618, EN10204 DIN3.1B
Shapes Manufactured:
Flat Bars, Square Bars, Round Bars, Rings, Hollows, Discs, Blocks and special Shapes. Send us a drawing to see how we can save you material and machining time!

The information in this data sheet is for information only and should not be used for engineering.

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