Incoloy Alloys
Incoloy A-286 (UNS S66286) — Composition, Properties & Supply
Incoloy A-286 (UNS S66286, equivalent to Chinese GH2132) is an iron-nickel-chromium precipitation-hardening superalloy. Below 700 °C it offers high strength and good oxidation resistance at lower cost than nickel-base superalloys, and is among the most heavily used grades for aerospace fasteners and turbine parts.
What is the chemical composition of Incoloy A-286?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ni | Ni | 24.0–27.0 |
| Cr | Cr | 13.5–16.0 |
| Fe | Fe | Balance |
| Ti | Ti | 1.90–2.35 |
| Mo | Mo | 1.00–1.50 |
| V | V | 0.10–0.50 |
| Al | Al | ≤ 0.35 |
| B | B | 0.001–0.010 |
| C | C | ≤ 0.08 |
| Mn | Mn | ≤ 2.00 |
| Si | Si | ≤ 1.00 |
Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.
What are the mechanical properties of Incoloy A-286?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 895 MPa (aged) | Room temperature |
| Yield strength (0.2% offset) | ≥ 585 MPa (aged) | Room temperature |
| Elongation | ≥ 15 % | Gauge length 50 mm / 4D |
| Hardness | ≥ 28 HRC | Brinell / Rockwell |
What are the physical properties of Incoloy A-286?
| Property | Value |
|---|---|
| Density | 7.93 g/cm³ |
| Melting range | 1370–1430 °C |
| Thermal conductivity | 15.1 W/m·K |
| Elastic modulus | 201 GPa |
| Maximum service temperature | 700 °C |
What are the key characteristics of Incoloy A-286?
- High strength and creep resistance below 700 °C
- Oxidation resistant to about 815 °C
- Lower cost than nickel-base alloys of equal strength
- Relatively good cold workability and machinability
Where is Incoloy A-286 used?
- Aero-engine bolts, fasteners and springs
- Gas turbine discs and blades
- Automotive turbocharger components
- High-temperature oilfield parts
- Nuclear and chemical high-temperature bolting
Which standards and specifications cover Incoloy A-286?
- ASTM B637
- AMS 5731
- AMS 5737
- UNS S66286
What product forms are available?
Frequently asked questions
What is the standard heat treatment for A-286?
A common cycle is solution treatment at 980 °C for 1 hour with oil quench or air cool, followed by ageing at 720 °C for 16 hours and air cooling (AMS 5731/5732). Parts needing better creep performance may use a 900 °C solution plus a 720 °C/650 °C double age.
Need Incoloy A-286 bar, tube, plate or forgings?
Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.
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