A286 is an iron-based nickel-chromium austenitic precipitation-hardened stainless steel alloy. The alloy is highly suitable for applications requiring high-strength corrosion resistance. A286 retains its high strength at elevated temperatures of 704°C (1300°F). The material is produced by vacuum induction melting (VIM) or vacuum oxygen decarburisation (VOD). The alloy is then remelted using vacuum arc or electroslag remelting processes to complete the production cycle. A286 finds typical use in lower-stress applications at high temperatures and provides good corrosion and oxidation resistance.
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Chemical Composition Limits |
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Weight% |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mo |
Ti |
V |
Al |
B |
Co |
Cu |
|
A286 |
0.08 max |
2 max |
0.025 max |
0.025 max |
1 max |
13.5-16 |
24-27 |
1-1.5 |
1.9-2.35 |
0.10-0.50 |
0.35 max |
0.0003-0.010 |
1 max |
0.50 max |
Alloy A286 bar can be solution treated at the temperatures detailed below, rapid cooled and then age hardened at 1325ºF (720ºC) for 16 hours and air cooling. The 1800ºF (980ºC) solution treatment produces the highest creep-rupture strength in age-hardened material whereas the 1650ºF (900ºC) treatment results in improved ductility and room temperature strength.
A286 Solution Treated
A286 Solution Treated is covered by specification AMS 5731 (AMS 5732 Capable) and BS HR52
Solution Heat Treatment: 1800ºF ± 25 (982 ± 14ºC) 1 hour, water/oil quench (AMS)
Hardness: ≥ 217HB or 220 HB (BS), ≥201HB (AMS)
A286 Solution Treated and Aged (1800ºF)
A286 Solution Treated and Aged is covered by specifications AMS 5732, BS HR51, ASTM A638 660 Type 2, ASTM A453 660 Class B
Solution Heat Treatment:
980ºC ± 10 for > 1 hour, followed by air cool (BS)
1800ºF ± 25 (982 ± 14ºC) 1 hour, water/oil quench (AMS)
Precipitation Heat Treatment:
720ºC ± 10 > 16 hours, followed by air cool (BS)
1300-1400 ºF (704-760ºC) hold not less 16 hours, air cool (AMS)
Hardness:
248 - 341 HB or 260 - 360 HV (BS)
248-341 HB (AMS)
Typical Mechanical Properties
|
Alloy |
0.2 Proof Stress (min) |
Tensile Strength (min) |
Elongation (min) |
|
Alloy A286 Solution Treated and Aged (BS) |
590 N/mm² |
900 N/mm² |
13% |
|
Alloy A286 Solution Treated and Aged (AMS) |
85 ksi (586 mpa) |
130 ksi (896 mpa) |
15% |
A286 Solution Treated and Aged (1650ºF)
A286 Solution Treated and Aged is covered by specifications AMS 5737, ASTM A638 660 Type 1, ASTM A453 660 Class A and EN-2303 (under 4" Bar)
Solution Heat Treatment:
1650ºF ± 25 (899 ± 14ºC) 1 hour, water/oil quench (AMS)
Precipitation Heat Treatment
1300-1400 ºF (704-760ºC) hold not less 16 hours, air cool (AMS)
Hardness
277-363 HB (AMS)
Typical Mechanical Properties
|
Alloy |
0.2 Proof Stress (min) |
Tensile Strength (min) |
Elongation (min) |
|
Alloy A286 Solution Treated and Aged (AMS) |
95 ksi ( 655mpa) |
140 ksi (965 mpa) |
12% |
A286 Other
AMS 5853 - 15% cold reduced (160 ksi/ 1103 Mpa tensile strength)
AMS 5726 - 40-50% cold reduced (200 ksi/ 1379 Mpa tensile strength)
Improved Hardness
A286 is easily machined and formed and offers greater hardness than many nickel-based stainless steel alloys. It is used in jet engine parts, thrust nozzles, and gas turbine components.
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