A286 Round Bar (UNS S66286)
A286 is an iron-nickel-chromium, precipitation-hardenable superalloy that keeps its strength and oxidation resistance at service temperatures up to 700 °C (1300 °F). The alloy is strengthened by a titanium and aluminium based gamma-prime phase and carries additions of molybdenum, vanadium and boron that give it excellent creep-rupture strength and notch ductility.
Nexforge Alloys manufactures and stocks A286 round bars in the solution treated and aged (STA) condition, with a bright peeled or centreless ground finish. Every heat is supplied with a mill test certificate covering chemistry, tensile properties at room temperature and hardness, and we can arrange elevated temperature tensile, stress rupture and ultrasonic testing on request.
A286 round bars in 6 mm to 250 mm diameter, supplied in solution treated and aged condition as per ASTM A638 Grade 660, AMS 5732 / 5737 and UNS S66286.
A286 Round Bar Specification
| Parameter | Details |
|---|---|
| Alloy Designations | A286, Alloy 660, UNS S66286, W.Nr. 1.4980, AISI 660 |
| Standards | ASTM A638 Gr. 660, ASTM A453 Gr. 660, AMS 5731, AMS 5732, AMS 5737, ASME SA638 |
| Size Range | 6 mm to 250 mm diameter (custom sizes on request) |
| Length | Random 3 to 6 metres, or cut to length |
| Condition | Solution treated (980 °C) and precipitation hardened (720 °C / 16 h) |
| Surface Finish | Bright peeled, centreless ground, rough turned or polished |
| Tolerance | h9, h10, h11 or as per customer drawing |
| Testing | Chemical analysis, tensile, hardness, UT, stress rupture (on request) |
| Certification | EN 10204 3.1 mill test certificate; 3.2 third-party inspection on request |
Chemical Composition (% by weight)
| Element | C | Mn | Si | P | S | Cr | Ni | Mo | Ti | Al | V | B | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A286 (S66286) | 0.08 max | 2.00 max | 1.00 max | 0.025 max | 0.025 max | 13.5 - 16.0 | 24.0 - 27.0 | 1.00 - 1.50 | 1.90 - 2.35 | 0.35 max | 0.10 - 0.50 | 0.001 - 0.010 | Balance |
Mechanical Properties
| Condition | Tensile Strength (min) | 0.2% Yield Strength (min) | Elongation (min) | Reduction of Area (min) | Hardness |
|---|---|---|---|---|---|
| Solution treated + aged (STA) | 895 MPa (130 ksi) | 585 MPa (85 ksi) | 15 % | 18 % | 24 - 37 HRC |
| Density | 7.94 g/cm³ | Melting range | 1370 - 1430 °C | Max. service temp. | 700 °C |
Values are minimum or typical figures as per the referenced standards and are for guidance only. Please refer to the mill test certificate supplied with the material for actual values.
Key Features
- High strength and creep-rupture resistance up to 700 °C
- Good oxidation and corrosion resistance in aqueous and high temperature environments
- Non-magnetic austenitic structure, fully precipitation hardenable
- Excellent notch ductility and fatigue strength for rotating parts
Applications
- Gas turbine wheels, spacers, casings and blades
- Jet engine fasteners, studs, bolts and after-burner components
- Turbocharger wheels and exhaust manifold studs
- High temperature bolting for pressure vessels and valves
- Springs, shafts and structural parts in aerospace and power generation