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Incoloy A-286 (UNS S66286) supplier — iron-nickel-based precipitation-hardened superalloy. High strength to 700°C. Aerospace bolts, turbine discs, jet engine components. AMS 5525/5726.
Shanghai Hangbo Alloy Group Co., Ltd. is an ISO 9001:2015 certified manufacturer and global supplier of premium Incoloy A-286 (UNS S66286 / W.Nr. 1.4980) round bars, forgings, plates, sheets and wire. A-286 is a precipitation-hardenable iron-nickel superalloy delivering high strength, excellent creep resistance and oxidation resistance from cryogenic temperatures up to 700°C (1290°F) — the industry standard for gas-turbine fasteners, shafts and casings.
Standards
- ASTM B637 — Forged or Rolled Bar, Rod, Wire and Forgings
- AMS 5731 / AMS 5732 — Bar, Wire, Plate, Sheet
- UNS S66286 / W.Nr. 1.4980 / DIN 17750
- ASME SB637 — Pressure Vessel Applications
Precise ASTM Chemical Composition (%)
| Element | Range / Max |
|---|---|
| Iron (Fe) | Balance |
| Nickel (Ni) | 24.0 – 27.0 |
| Chromium (Cr) | 13.5 – 16.0 |
| Titanium (Ti) | 1.90 – 2.35 |
| Molybdenum (Mo) | 1.00 – 1.50 |
| Vanadium (V) | 0.10 – 0.50 |
| Aluminum (Al) | 0.35 max |
| Manganese / Silicon (Mn/Si) | 2.0 / 1.0 max |
| Carbon (C) | 0.08 max |
| Boron (B) | 0.003 – 0.010 |
| Phosphorus / Sulfur (P/S) | 0.025 / 0.025 max |
Physical & Mechanical Properties
| Property | Typical Value (Min) |
|---|---|
| Tensile Strength (ST + Aged, ASTM B637) | 1000 MPa (145 ksi) |
| Yield Strength (0.2% Offset) | 655 MPa (95 ksi) |
| Elongation (in 2") | 12% |
| Reduction of Area | 15% |
| Density | 7.94 g/cm³ |
| Melting Range | 1364 – 1424 °C |
| Service Temperature Range | -196 °C to 700 °C |
Depth Characteristics
- Precipitation Hardenable: Age-hardened by gamma-prime (Ni3(Ti,Al)) precipitates to reach 1000+ MPa tensile strength with excellent ductility.
- High Strength at 700°C: Maintains useful mechanical properties to 700°C and good oxidation resistance to ~980°C in short-term exposure.
- Cryogenic Toughness: Exceptional impact toughness down to -196°C, used in cryogenic fasteners and couplings.
- Low Notch Sensitivity & Good Fatigue: Excellent low-cycle fatigue and stress-rupture behavior for rotating and bolted components.
- Stable Magnetic Properties: Non-magnetic in the fully aged condition, suitable for electromagnetic applications.
Manufacturing Process — Forging & Heat Treatment
A-286 is melted by VIM + VAR/ESR for premium cleanliness, then hot-forged at 980–1150°C with finishing above 950°C. The standard heat treatment sequence is: solution treatment at 980°C (1800°F) for 1 hour, oil quenching, followed by aging at 720°C (1325°F) for 16 hours and air cooling. This two-step cycle precipitates the gamma-prime phase and develops the full 1000 MPa-grade strength. Bars are straightened, peeled and surface-inspected before release.
Testing & Inspection Methods — PMI / UT / RT
- PMI (Positive Material Identification): 100% XRF/arc-OES verification of Ni, Cr, Ti, Mo, V on all delivered bars and forgings.
- UT (Ultrasonic Testing): Full-length ultrasonic examination per ASTM E213/ASTM A388 on bar and forgings for internal soundness.
- RT (Radiographic Testing): Radiographic inspection of critical forgings per ASME Section V where specified.
- Plus: room/high-temperature tensile and stress-rupture testing, impact testing (cryogenic where required), hardness verification, grain-size evaluation and liquid penetrant inspection; EN 10204 3.1/3.2 certificates supplied.
High-Frequency Application Scenarios
- Gas Turbines: Turbine discs, casings, shafts, blades and bolting in aero and industrial engines.
- Fasteners: High-strength bolts, studs, nuts and washers for elevated-temperature and cryogenic assemblies.
- Rocket & Aerospace: Engine housings, flanges and structural fittings in launch vehicles and satellites.
- Nuclear Engineering: Springs, fasteners and instrument components requiring stable properties under irradiation.
- Automotive & Racing: Turbocharger shafts, exhaust components and high-performance engine fasteners.
6+ Professional FAQs
1. How is A-286 hardened?
By solution treating at ~980°C, quenching, then aging at ~720°C for 16 hours, which precipitates gamma-prime (Ni3(Ti,Al)) strengthening phase.
2. What is the maximum operating temperature of A-286?
Continuous service to ~700°C (1290°F) for mechanical integrity; short excursions to 980°C are possible in oxidation-dominated service.
3. How does A-286 compare with Inconel 718?
A-286 offers easier fabricability, better low-temperature toughness and lower cost, while 718 provides higher strength above 650°C and better corrosion resistance.
4. Is A-286 weldable?
It can be welded by TIG/MIG, but fusion welding reduces HAZ properties; use matching or 625-type fillers and re-aging after welding for critical parts.
5. Is A-286 magnetic?
In the fully aged condition it is essentially non-magnetic, making it suitable for electrical and electromagnetic components.
6. Which standard covers A-286 bar and forgings?
ASTM B637 covers forged/rolled bar, rod, wire and forgings; AMS 5731/5732 are the common aerospace procurement specs.
7. Does A-286 work-harden during machining?
Yes — use sharp carbide tooling, rigid setups and generous coolant; machining is best performed in the solution-treated condition before final aging.
Supply List
- Round Bar: Φ6mm – Φ350mm, peeled/ground, ST + aged
- Forgings: Turbine discs, flanges, rings, shafts per drawings
- Plate / Sheet: Thickness 1mm – 60mm
- Wire: Φ0.5mm – 8mm for fasteners and springs
- Fastener Stock: Bars certified for bolt/stud manufacture
Need certified Incoloy A-286 for your turbine or fastener program? Contact Shanghai Hangbo Alloy Group for instant quotations, stock availability and mill certificates — quick response within 10 minutes.
