A286, UNS S66286, is an iron based austenitic superalloy strengthened by gamma prime precipitation through titanium and aluminum. It delivers high strength and good oxidation resistance to roughly 1300F at a lower cost than the nickel based superalloys, because iron carries most of the composition.
It is the dominant material for high temperature aerospace fasteners and is used widely in turbine wheels, casings, afterburner parts and non rotating engine hardware, as well as in high strength non magnetic applications.
A286 is ordered by specification rather than by name: AMS 5731, 5732, 5734, 5737, 5525, 5804 and 5805 carry different condition and product form requirements. Give us the spec and we release to it.
Sizes and stock
- Round bar: up to 11" DIA
- Sheet / plate: up to 4" THK
- Flat bar and forgings: by request
Processing capabilities
- Billet conversion and open die, closed die and ring forging
- Solution treat, age and anneal to the applicable spec
- Saw cutting, trepanning, gun drilling and CNC machining
- Ultrasonic, penetrant dye, micrography and physical testing
Cold reduced material per AMS 5853 and AMS 5726 available up to 1.51" DIA.
Specifications
Material is released to the applicable specification with mill test reports and, on request, independent lab verification.
Why engineers specify A 286
- High strength to about 1300F at moderate cost
- Non magnetic with good oxidation resistance
- Dominant high temperature fastener material
- Available across the full specification range
Nominal chemistry
Percent by weight, nominal composition per the governing specification. The mill test report for your heat is the controlling document.
Typical mechanical properties
| Condition | Tensile strength | Yield strength | Elongation | Hardness |
|---|---|---|---|---|
| Solution treated | ~95 ksi | ~40 ksi | ~40% | - |
| Solution treated and aged | 140 ksi min | 95 ksi min | 15% min | 248-341 HBW |
Typical published values for reference only, not for design. Properties vary with section size, product form and processing. Order to the specification and condition your drawing requires.
Heat treatment and conditions
- 01Solution treat at 1650F or 1800F depending on the specification, oil or water quench
- 02Age at 1325F for 16 hours, air cool
- 03Condition and product form requirements vary by AMS specification, so order by spec
If our stock is not already in the condition you need, we can quote the material with the heat treatment performed before it ships.
Typical applications
- High temperature bolts, studs and fasteners
- Turbine wheels, casings and frames
- Afterburner and exhaust components
- Non magnetic high strength hardware
Fabrication notes
Machining
Nickel and cobalt superalloys work harden aggressively. Use rigid setups, sharp tooling, slow speeds, positive feed that stays under the hardened skin, and flood coolant. Age hardened material machines far more slowly than solution treated material, so rough before aging wherever the print allows.
Welding
Most solid solution grades weld readily with matching filler. Age hardenable grades such as 718 and Waspaloy are welded in the solution treated condition and aged afterward to control strain age cracking.
Forming
Hot working ranges are narrow and forces are high. Cold form in the annealed condition with intermediate anneals, and stress relieve before final heat treatment.
A 286 compared with similar grades
Alloy 718
Higher strength and temperature capability, nickel based and more expensive.
Waspaloy
Considerably higher temperature capability for rotating hardware.
Designations and cross reference
- Material family
- Nickel & Cobalt Alloys
- UNS number
- S66286
- Werkstoff (W.Nr)
- 1.4980
Working from an obsolete, foreign or superseded designation? Send it over and we will cross reference it to a current grade and specification.
Quality, testing and traceability
Supplied with mill test reports and heat traceability, with ultrasonic inspection, penetrant dye, micrography, grain size, stress rupture and mechanical testing available on request.
We are AS9100D and ISO 9001:2015 registered. If our stock does not already carry the inspection your specification requires, we can quote the material with that work performed. More on our quality system
Available forms
Custom sizes converted from billet, plus saw cut, waterjet and near-net blanks. See custom conversions
A 286 frequently asked questions
What is A 286?
A286, UNS S66286, is an iron based austenitic superalloy strengthened by gamma prime precipitation through titanium and aluminum. It delivers high strength and good oxidation resistance to roughly 1300F at a lower cost than the nickel based superalloys, because iron carries most of the composition.
What forms is A 286 available in?
We supply A 286 in bar, sheet, plate, forging. Custom sizes are converted from billet, and we can provide saw cut, waterjet or near net blanks so material arrives closer to your finished part.
What is the UNS or equivalent designation for A 286?
A 286 is designated UNS S66286, Werkstoff 1.4980. If your drawing calls out an obsolete or foreign designation we can cross reference it and confirm the equivalent before you order.
What specifications can A 286 be supplied to?
Commonly ordered specifications include AMS 5853, AMS 5525, AMS 5735, AMS 5731, AMS 5732, AMS 5737. Material is released to the specification and condition on your purchase order, with mill test reports supplied as standard.
What conditions can A 286 be ordered in?
We can supply Solution treated, Solution treated and aged. If our stock is not already in the condition you need, we can quote it with the heat treatment performed before shipment.
Can you cut A 286 to size?
Yes. Saw cutting, waterjet, laser and shearing are available, along with trepanning, gun drilling, lathe turning and CNC machining, so you can order blanks or rough machined pieces rather than full lengths.
Do you provide test reports and additional testing on A 286?
Every order ships with mill test reports and heat traceability. If your print calls for ultrasonic inspection, penetrant dye, magnetic particle, chemical assay, micrography, hardness or mechanical testing and our stock does not already carry it, we can quote the material with that work performed.
Can A 286 be supplied to DFARS domestic melt requirements?
Tell us at quote stage if the order is DFARS or domestic melt restricted and we will confirm availability against that requirement before you commit.
What do you need to quote A 286?
Grade, form, dimensions, quantity, specification and condition, plus any testing or certification requirements and the date you need it. Send a drawing if you have one. Quotes are typically ready within 24 hours.
How does A 286 compare with Alloy 718?
Higher strength and temperature capability, nickel based and more expensive.