Alloy A-286 (660B) is special corrosion, oxidation and heat resistant, precipitation hardenable austenitic stainless steel. It is designed for long-term, high strength service up to 700°C. It is non-magnetic even after severe cold deformation. The alloy has good oxidation resistance in continuous service up to 800°C.
Alloy A-286 (660B) has good machinability and machines best in the precipitation-hardened condition when it has a machinability rating 45% that of AISI1212 free-cutting grade. The alloy is used mainly in the precipitation-hardened condition. The hardness is 248 HB min for precipitation-hardened grades but hardness must not exceed 330HB to meet the NACE MR0175 requirements. Samples must also meet the stress rupture requirements of a minimum elongation of 3% when tested at 650°C.
Related Specifications of Alloy A-286 (660B)
- S66286
- ASTM A453 (GD 660)
- ASTM A638 (GD 660)
- NACE MR 0175
- 1.4980
- X6NiCrTiMoVB25-15-2 (EU)
Nominal Composition of Alloy A-286 (660B)
Fe 56%, Ni 25.5%, Cr 15.0% Ti 2.1%, Mo 1.5%
Mechanical Properties of Alloy A-286 (660B)
| Ultimate Tensile Strength (N/mm²) | Proof Stress (N/mm²) | Elongation (%) | Hardness (HB) |
|---|---|---|---|
| 895 | 585 | 15 | 248 max |
Key Features of Alloy A-286 (660B)
- Very high corrosion resistance
- Good oxidation resistance up to 800°C
- Non-magnetic even after severe cold deformation
- High strengths that are well retained up to 700°C
- Good machinability
Application of Alloy A-286 (660B)
Offshore & marine | Fasteners, and critical pump / valve components
Aerospace | Turbine shafts, aero engine components and high performance fasteners
Power generation | Components for gas turbines, turbine discs, and turbine blades
Other | Springs, screws, bolts, thrust nozzles and transmission parts
Columbia Metals – a leading supplier of Alloy A-286 (660B)
With decades of experience and a huge range of stock, Columbia Metals is an industry leader in the supply of Alloy A-286 (660B) and other high quality specialist engineering alloys.
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