Alloy A-286 (UNS S66286) is an age-hardenable iron-nickel-chromium superalloy strengthened through titanium and aluminum additions. This material maintains high strength and oxidation resistance up to 700°C (1290°F), making it a cost-effective alternative to more highly alloyed materials for aerospace fasteners, turbine components, and high-temperature industrial applications.
1. Product Specifications & Physical DataZYTC Alloy supplies UNS S66286 in mill forms suitable for critical fasteners, engine components, and high-temperature structural applications requiring certified mechanical properties. Available Forms: Bar, rod, wire, forging stock, plate, sheet, strip, and fasteners. Specifications: AMS 5525 (sheet/strip), AMS 5731/5732/5737 (bar/forgings), AMS 5805 (welding wire), ASTM A453 (Grade 660), NACE MR0175/ISO 15156.
| Chemical Composition (Weight %) | Alloy A-286 Specification |
|---|
| Nickel (Ni) | 24.0 - 27.0 | | Chromium (Cr) | 13.5 - 16.0 | | Iron (Fe) | Balance | | Titanium (Ti) | 1.90 - 2.35 | | Molybdenum (Mo) | 1.00 - 1.75 | | Manganese (Mn) | 1.00 - 2.00 | | Silicon (Si) | 0.40 - 1.00 | | Aluminum (Al) | 0.10 - 0.50 | | Carbon (C) | ≤ 0.08 | | Boron (B) | 0.001 - 0.010 | | Vanadium (V) | 0.10 - 0.50 (selected specs) |
| Physical Properties | Metric | Imperial |
|---|
| Density | 7.92 - 7.94 g/cm³ | 0.286 - 0.287 lb/in³ | | Melting Range | 1370 - 1430°C | 2500 - 2600°F | | Thermal Conductivity | 14.2 W/m·K | 98.6 BTU·in/hr·ft²·°F | | Curie Temperature | -196°C | -320°F (non-magnetic) |
| Mechanical Properties (Solution Treated) | Metric | Imperial |
|---|
| Tensile Strength | 620 MPa | 90,000 psi | | Yield Strength (0.2% offset) | 275 MPa | 40,000 psi | | Elongation at Break | 40% | 40% |
| Mechanical Properties (Precipitation Hardened) | Metric | Imperial |
|---|
| Tensile Strength (AMS 5731) | 1035 MPa | 150,000 psi | | Yield Strength (0.2% offset) | 690 MPa | 100,000 psi | | Elongation at Break | 15-25% | 15-25% |
2. Operating Conditions & Selection CriteriaA-286 is specified when austenitic stainless steels cannot provide sufficient high-temperature strength but the cost of nickel-base superalloys is not justified. Its precipitation-hardening characteristics enable properties tailored to specific service requirements. Service Temperature Range: Optimized for continuous operation from cryogenic temperatures up to 700°C (1300°F). Short-term excursions to 815°C (1500°F) possible with reduced life expectancy . High-Temperature Strength: Maintains useful strength through 700°C; 100-hour rupture strength at 650°C is approximately 345 MPa (50 ksi) . Oxidation Resistance: Chromium content provides good resistance to scaling in air and combustion atmospheres up to 815°C (1500°F) . Corrosion Performance: Suitable for mildly corrosive environments; not intended for severe aqueous corrosion or reducing acid service . Magnetic Properties: Non-magnetic at all temperatures down to cryogenic conditions; suitable for instrumentation and non-magnetic equipment .
3. Fabrication & Material ComparisonA-286 offers good fabricability with proper heat treatment sequencing, making it suitable for complex formed components and precision fasteners. Machining: Best performed in solution-treated condition before aging. Machinability rating approximately 50% of B1112 steel. Carbide tooling recommended with positive rake angles. Work-hardening rate moderate; rigid setups required for precision tolerances . Welding: Good weldability using GTAW, GMAW, and limited SMAW. Matching filler metals (AMS 5805) recommended for high-strength applications. Preheating generally not required; post-weld aging restores properties . Forming & Heat Treatment : Solution Annealing: 900-980°C (1650-1800°F), hold time dependent on section size, oil or water quench Aging Treatment: 700-730°C (1300-1350°F) × 16 hours, air cool Hot Working Range: 925-1120°C (1700-2050°F) Cold Working: Good formability in solution-treated condition; intermediate anneals may be required for severe deformation
Material Comparison: vs. 316 Stainless: Significantly higher strength above 500°C through precipitation hardening; preferred for elevated-temperature fasteners . vs. Inconel 718: Lower cost alternative where maximum service temperature below 650°C; 718 required for higher stresses or temperatures above 700°C . vs. Waspaloy: More cost-effective where strength requirements moderate; Waspaloy offers superior performance above 650°C . ASTM A453 Grade 660: Standard specification covering A-286 for high-temperature bolting; Class A (121 ksi min) and Class B (130 ksi min) variants available .
Applications Jet engine components: casings, rings, fasteners Gas turbine blades and vanes Afterburner parts High-temperature industrial fasteners Automotive turbocharger components Exhaust manifold hardware Cryogenic equipment Nuclear reactor components
Contact ZYTC Alloy for certified Alloy A-286 (UNS S66286) materials with complete traceability, AMS/ASTM specifications, technical datasheets, and competitive pricing on standard sizes or custom-forged components. Email:daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
