TYPE A-286 alloy (UNS S66286) is an iron-base superalloy useful for applications requiring high strength and corrosion resistance up to 1300°F (704°C) and for lower stress applications at higher temperatures.
TYPE A-286 alloy (UNS S66286) is an iron-base superalloy useful for applications requiring high strength and corrosion resistance up to 1300°F (704°C) and for lower stress applications at higher temperatures.
TYPE A-286 alloy (UNS S66286) is a heat and corrosion resistant austenitic iron base material which can be age hardened to a high strength level. The alloy is also used for low temperature applications requiring a ductile, non-magnetic high strength material at temperatures ranging from above room temperature down to at least -320°F (-196°C). The alloy may be used for moderate corrosion applications in aqueous solutions.
| Zeon Grade | Alloy Name | UNS | EN / DIN / W Nr. | Trademarks |
|---|---|---|---|---|
| ZeonA286 | Alloy A286 | UNS S66286 | 1.4943 | Incoloy A286 |
| Element | Content (%) |
|---|---|
| Carbon | 0.08 max |
| Manganese | 0.35 max |
| Phosphorus | 0.015 max |
| Sulfur | 0.015 max |
| Silicon | 0.35 max |
| Chromium | 17-21 |
| Nickel | 50-55 |
| Molybdenum | 2.80-3.30 |
| Columbium | 4.75-5.50 |
| Titanium | 0.65-1.15 |
| Aluminum | 0.20-0.80 |
| Cobalt | 1.00 max |
| Boron | 0.006 max |
| Copper | 0.30 max |
| Tantalum | 0.05 max |
| Iron | Balance |
| Properties | Metric | Imperial |
|---|---|---|
| Density | 0.286 lb/in3 (7.92 g/cm3) | 0.287 lb/in3 (7.94 g/cm3) |
| Specific Gravity | 7.92 | 7.94 |
| Melting Range | 2500-2600°F | 1370-1430°C |
| Yield Strength | Ultimate Tensile Strength | Elongation |
|---|---|---|
| 40,000 psi | 90,000 psi | 40% |
| 275 MPa | 620 MPa |
| Temperature Range | |||
|---|---|---|---|
| °C | °F | W/m.K | Btu.ft/ft2.hr.°F |
| 150 | 302 | 15.1 | 8.7 |
| 300 | 572 | 17.8 | 10.3 |
| 500 | 932 | 21.8 | 12.6 |
| 600 | 1112 | 23.9 | 13.8 |
| Corrosion Resistance Properties of Alloy A286 |
|---|
| Type A-286 alloy content is similar in chromium, nickel, and molybdenum to some of the austenitic stainless steels. Consequently, A-286 alloy possesses a level of aqueous corrosion resistance comparable to that of the austenitic stainless steels. In elevated temperature service, the level of corrosion resistance to atmospheres such as those encountered in jet engine applications is excellent to at least 1300°F (704°C). Oxidation resistance of A-286 is high for continuous service up to 1500°F (816°C) and intermittent service up to 1800°F (982°C). |
| Cold Working | Super alloy A-286 is capable of being readily cold worked and a solution anneal heat treatment is recommended when this alloy is work hardened due to severe cold forming. • This solution anneal heat treatment will thus enable softening of super alloy A-286. |
|---|---|
| Welding | Welding methods used for stainless steels are also recommended for super alloy A-286. • The area to be welded should be clean. • Post welding heat treatment or preheating is not recommended for this alloy. • Better welding results can be obtained when this alloy is solution annealed. |
| Forging | Heavy forging and light forging are suitable for super alloy A-286. • Heavy forging is carried out between 1010-1204°C (1850-2200°F) and light forging between 871-1010°C (1600-1850°F). |
| Forming | Conventional forming methods are used to readily hot or cold form super alloy A-286. |
| Machinability | Conventional machining techniques are used to readily machine super alloy A-286. • This machining process involves turning, drilling and milling. • In the turning operations, the usage of cemented carbide tools is recommended for high cutting rates. |
| Aging | Super alloy A-286 is first solution heat treated at 982°C (1800°F) before the aging process. Aging takes place for 16 h at 718°C (1325°F) after which this alloy is cooled in air. |
| Hardening | Super alloy A-286 is hardened by the cold working process and is also capable of being age hardened due to the presence of titanium in this alloy. |
| Heat Treatment | Super alloy A-286 is solution annealed at 982°C (1800°F), oil quenched, held for 16 h at 718°C (1325°F) and finally cooled in air. This heat treatment improves the strength of super alloy A-286. |
| Applications | Super alloy A-286 is used in gas turbine forgings, fasteners, superchargers, cryogenic equipment, missile components, corrosive deep well hardware and jet engines. |