UNS S66286 - Alloy A-286

UNS S66286 (A-286) redefines high-stress performance with its iron-nickel-chromium matrix, engineered to sustain 700°C operational temperatures while delivering 1.400 MPa tensile strength—a 40% advantage over conventional Inconel 718. Its γ' phase precipitation hardening mechanism ensures unmatched creep resistance for jet engine components, gas turbine disks, and reusable rocket thrust chambers exposed to rapid thermal cycling.

Certifications & Cross-Industry Validation

Metallurgical Breakthroughs

Elemental Synergy

Nickel (24–27%): Stabilizes FCC structure for cryogenic-to-red heat adaptability.

Titanium (1.9–2.4%): Forms Ni₃Ti precipitates during aging (540–760°C range).

Molybdenum (1.0–1.5%): Mitigates sulfur embrittlement in combustion environments.

Boron (0.003–0.010%): Enhances grain boundary cohesion under creep stress.

Thermomechanical Mastery

Solution Treatment: 980°C oil quenching for supersaturated solid solution.

Aging Precision: Dual-stage 720°C/8h + 620°C/8h aging optimizes γ' phase distribution.

Performance Dominance Matrix

5 Transformative Value Drivers

Hypersonic Endurance

Withstands Mach 5+ skin temperatures (1.200°C localized) in reusable launch vehicles.

Weight-to-Strength Revolution

Enables 25% lighter turbine rotors vs. nickel alloys (FEA-validated).

Cryogenic Compatibility

Maintains 80 J impact toughness at -253°C (liquid hydrogen storage).

Corrosion-Abrasion Duopoly

50% lower erosion rate than 17-4PH in sand-laden geothermal steam.

Sustainable Manufacturing

75% recycled content with SLM (Selective Laser Melting) compatibility.

Cross-Sector Pioneering Applications

Technical Knowledge Nexus

Q1: Welding protocol for turbine components?

A: Use ERNiFeCr-2 filler with 95%Ar-5%He shielding; post-weld age at 720°C/8h to restore properties.

Q2: Machining best practices?

A: Carbide tools with 70 m/min speed + high-pressure coolant (ISO S30T carbide grade recommended).

Q3: How does A-286 compare to Inconel 718?

A: 15% higher yield strength at 650°C but lower corrosion resistance in HCl environments.

Q4: Surface treatment for oxidation?

A: Aluminide diffusion coating boosts oxidation limit to 900°C (AMS 4762 compliant).

Q5: Lead time for forgings?

A: 8–12 weeks for closed-die aerospace forgings; ISO 9001/AS9100 certified supply chain.

Strategic Procurement Advantages

Aerospace DNA

NADCAP-accredited heat treatment and NDT (UT/FPI).

Dimensional Agility

Thickness: 0.5–150mm | Width: 300–2.500mm (±0.1% tolerance).

Global Readiness

Just-in-time stock in Toulouse, Seattle, and Chengdu hubs.

Additive Manufacturing

Gas-atomized powder (15–53μm) for laser powder bed fusion.

Keywords: UNS S66286. Alloy A-286. Precipitation-Hardening Superalloy, Jet Engine Alloy, Hypersonic Material

Common Surfaces

Stainless Steel Standards Comparison Table