Alloy A-286，Incoloy A-286 ，,E FORU

British Specs:，American Specs:，German Specs:

**Alloy A-286 / Incoloy A-286 (UNS S66286)** **Product Overview** Alloy A-286 is a precipitation-hardening iron-nickel-chromium superalloy known for its high strength and excellent corrosion resistance at elevated temperatures up to 1300°F (700°C). This age-hardenable austenitic alloy maintains exceptional mechanical properties and oxidation resistance, making it particularly valuable in aerospace, turbine engine, and high-stress structural applications. --- **Chemical Composition (Weight %)** | Element | Content (%) | Role in Alloy | |---------|-------------|---------------| | Fe | Balance | Base element | | Ni | 24.0-27.0 | Austenite stabilizer, strength | | Cr | 13.5-16.0 | Oxidation resistance | | Mo | 1.0-1.5 | Solid solution strengthening | | Ti | 1.9-2.35 | Primary age-hardening element | | Al | 0.35 max | Secondary hardening | | V | 0.10-0.50 | Strengthening element | | B | 0.003-0.010 | Grain boundary strengthening | | C | 0.08 max | Controlled for stability | | Mn | 2.00 max | Stability and workability | --- **Physical & Mechanical Properties** **Physical Properties:** | Property | Value | |----------|-------| | Density | 7.93 g/cm³ | | Melting Point | 1390-1430°C | | Thermal Expansion | 14.2 μm/m·°C (20-100°C) | | Thermal Conductivity | 18.0 W/m·K | | Modulus of Elasticity | 201 GPa | **Mechanical Properties (Age-Hardened):** | Property | Room Temperature | 650°C (1200°F) | |----------|------------------|----------------| | Tensile Strength | 895-1100 MPa | 690-895 MPa | | Yield Strength | 585-860 MPa | 550-760 MPa | | Elongation | 15-25% | 15-25% | | Hardness | 248-321 HB | 200-280 HB | --- **International Standards & Specifications** | Standard Type | Specification | Application | |---------------|---------------|-------------| | ASTM | A453 (Grade 660) | Bolting materials | | AMS | 5525, 5731, 5732, 5737 | Bar, sheet, strip, wire | | UNS | S66286 | Unified Numbering System | | EN | 1.4980 | European Standard | | ASME | - | Code Case 1991 | --- **Applications** 1. **Aerospace Industry** - Turbine engine components - Afterburner parts - Jet engine rings and casings - Fasteners and bolting - Structural components 2. **High-Temperature Fasteners** - High-strength bolts - Studs and nuts - Special threaded components - Nuclear reactor bolting 3. **Industrial Applications** - Gas turbine components - High-temperature tooling - Nuclear reactor components - Heat treatment fixtures 4. **Automotive Racing** - Turbocharger components - Exhaust system parts - High-performance fasteners --- **Heat Treatment Guidelines** **Solution Treatment:** - Temperature: 1700-1800°F (925-980°C) - Rapid cooling (water quench or rapid air cool) **Age Hardening:** - Temperature: 1300-1400°F (705-760°C) - Time: 16-20 hours - Air cool **Resulting Structure:** - Austenitic matrix with gamma prime (γ') precipitates - Optimal strength and ductility combination --- **Key Characteristics** **Advantages:** - High strength-to-weight ratio - Excellent creep resistance - Good oxidation resistance up to 1300°F - Age-hardenable for precise property control - Good fabrication characteristics **Limitations:** - Not recommended for prolonged use above 1300°F - Requires proper heat treatment for optimal properties - Higher cost than conventional stainless steels --- **Fabrication Characteristics** **Machining:** - Best performed in solution-treated condition - Use positive rake angles and sharp tools - Moderate speeds with good feed rates - Use abundant coolant for heat dissipation **Welding:** - Good weldability by common processes - Post-weld heat treatment required - Use matching filler metals - Solution treat after welding for best properties **Forming:** - Good cold forming characteristics - Best formed in solution-treated condition - Intermediate annealing may be required --- **Alternative Materials Comparison** | Material | Temperature Limit | Advantages/Limitations vs A-286 | |----------|-------------------|---------------------------------| | Inconel 718 | 1300°F | Better stress rupture properties | | Waspaloy | 1500°F | Higher temperature capability | | 17-4PH | 600°F | Lower cost, lower temperature | | 304 Stainless | 1500°F | Lower strength, better corrosion | --- **Quality Assurance & Testing** - **Chemical Analysis**: Heat certification - **Mechanical Testing**: Tensile, hardness, impact - **Non-Destructive**: UT, PT, RT as required - **Microstructure**: Grain size and phase verification - **Certification**: Full traceability with mill certs --- **Conclusion** Alloy A-286 remains a premier choice for applications requiring high strength and reliability at intermediate temperatures. Its unique combination of age-hardening capability, good fabrication characteristics, and excellent mechanical properties make it indispensable in aerospace, power generation, and specialized industrial applications. The alloy's proven performance in critical components ensures its continued importance in advanced engineering applications where failure is not an option.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2716 gallon liquid totes Special package is available on request.