Alloy A286 steel – AMS 5737, AMS 5731, AMS 5732, AMS 5525
Incoloy Alloy® A-286 (also known as A286 stainless steel) is a nickel and iron-based, austenitic superalloy that is useful for applications requiring high strength and corrosion resistance up to 1300°F (704°C), and for lower stress applications at higher temperatures. The mechanical properties of this alloy are developed by suitable solution annealing and precipitation hardening treatments.
This alloy has excellent high temperature oxidation resistance and is designed to maximize creep and stress rupture properties, with some reduction in strength. A-286 material can attain high strength levels when aged after cold work and has wide applications in high temperature fasteners and springs. We stock A286 steel in round bar (AMS 5731, 5732, 5737), sheet and coil forms (AMS 5525, 5858), with a variety of cutting and processing services available.
A286 Inventory Size Ranges
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Standard Inventory Specifications
A-286 Sheet, Coil and Bar:
- UNS S66286
- ASTM A 453
- ASME SA 453
A-286 Sheet:
- AMS 5525
- AMS 5858
A-286 Bar:
- AMS 5731
- AMS 5732
- AMS 5737
- ASTM A 638
Other industry standards we comply with:
- EN 1.4980
- DIN EN 10204 3.1
- PWA-LCS
- GE Aircraft Engine (GT193)
- GE Aviation S-SPEC-35 AeDMS S-400
- RR SABRe Edition 2
- DFARS Compliant
Common Trade Names
- Incoloy Alloy A286 (® Special Metals)
- Pyromet Alloy A-286 (® Carpenter Technology)
- ATI A286 (™ Allegheny Technologies)
- A286 Steel
Common Applications of A286
- Jet engine components
- Fasteners
- Springs
- Bolts
- Flanges
- Blades
- Afterburners
- Automotive applications
- Offshore oil & gas
- Moderate corrosion applications in aqueous solutions
- Non-magnetic cryogenic equipment
Resistance to Corrosion and Oxidation
Type A286 alloy content is similar in chromium, nickel, and molybdenum to some of the austenitic stainless steels. Consequently, this alloy possesses a similar level of aqueous corrosion resistance to these grades. In higher temperature services, the level of corrosion resistance to atmospheres such as those found in jet engine applications is excellent to at least 1300°F (704°C). Oxidation resistance is high for continuous service up to 1500°F (816°C) and intermittent service up to 1800°F (982°C).
Chemical Composition
| Element | Percent by Weight | |
|---|---|---|
| C | Carbon | 0.08 maximum |
| Mn | Manganese | 2.00 maximum |
| P | Phosphorus | 0.025 maximum |
| S | Sulfur | 0.025 maximum |
| Si | Silicon | 1.00 maximum |
| Cr | Chromium | 13.50 - 16.00 |
| Ni | Nickel | 24.00 - 27.00 |
| Mo | Molybdenum | 1.00 - 1.50 |
| Ti | Titanium | 1.90 - 2.35 |
| V | Vanadium | 0.10 - 0.50 |
| Al | Aluminum | 0.35 maximum |
| B | Boron | 0.003 - 0.010 |
| Fe | Iron | Balance |
Alloy A286 Physical Properties
| 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 |
| Magnetic Permeability | 1.010 | 1.007 |
| Temperature Range | Linear Coefficients of Thermal Expansion · 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 |
| Temperature Range | Coefficients | ||
|---|---|---|---|
| °C | °F | W/m·K | Btu/(hr/ft²/in/°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
420 Joules/kg °K (Btu/lb/°F)
| Temperature | microhm-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 and Yield Strength of A286
Type A286 alloy is formed most easily in the solution treated condition. Typical room temperature tensile properties of material solution treated at 1800°F (982°C) are shown below.
- Yield Strength: 40,000 psi (275 MPa)
- Ultimate Tensile Strength: 90,000 psi (620 MPa)
- Elongation: 40%
Additional information about A286
For many decades, stainless steels have been a popular material for modern fasteners, providing good strength and long-term resistance to corrosion. Manufacturing processes have made them economical and ubiquitous, but they cannot match the strength of alloy steel bolts and fasteners. 4xx grades of stainless steel had the strength, but not the corrosion resistance of austenitic 3xx grades, and A-286 was one of the earliest and most versatile nickel alloys used to replace these stainless steels in high strength fastener applications.
It is a high Cr-Ni alloy (with crucial additions of molybdenum and titanium) capable of retaining high strength at temperatures up to 1000F and can be heat treated to a high tensile strength. Our A-286 round bar stock and sheet formulations are ideal for manufacturing hex bolts, nuts, screws and washers.
The advantages of cold working A286 can optimize total use of the material while increasing strength. Hot working and forming of A286 is sometimes used for larger diameter fasteners where it remains more resistant to deformation than 3xx grades of steel. It is somewhat more difficult to machine than these grades, but still easier than other nickel based precipitation-hardening alloys like 718, and is most often machined in full or partially aged condition.
Welding A-286 is mainly done in thin walled sections, as heavier sections are susceptible to hot cracking. AMS 5858 is designed and supplied for welding.
A-286 is also frequently used in gas turbines for low pressure buckets and first and second stage turbine wheels, as it retains strength and corrosion resistance at high temperatures. This also makes it ideal for afterburner construction and exhaust nozzles. A-286 material is also used by automotive manufacturers in exhaust valves and manifold fasteners for its tensile strength, creep strength and corrosion resistance.
We are A286 distributors for sheet, coil and round bar stock with the experience to help you purchase the right product for the right job. For a price on our in-stock inventory please contact us for a quote.
*The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.