Alloy 286 / 660
A high temperature steel bolting grade, used for fasteners and component parts within the marine, power and aerospace industry.
- ASTM A453 GR 660 (High Temperature Bolting) UNS S66286Tested and heat treated to conform to grades A, B and D
Fully certified material, additional testing available
UK, US and European origin unless otherwise stated
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Broder Metals Group supply air melt material to ASTM A453 GR 660 (High Temperature Bolting) and UNS S66286.
Our product conforms to the Alloy 660 grade D specification (with a guaranteed yield strength minimum of 105,000 PSI), but with stress rupture tests carried out to also conform to 660 grade A. These provide a tensile strength of 895 MPa (minimum), 0.2% offset yield strength of 725 MPa (minimum), elongation of 15% and reduction of area of 18%. Hardness is in the range 29-35 HRC.
Although best known for the above grades we also supply ASTM A453 GR 660 heat treated and tested to conform to grade B. This provides a tensile strength of 895 MPa (minimum), a lower 0.2 offset yield strength of 585 MPa (minimum), elongation of 15% and reduction of area of 18%. Hardness is in the range 24-37 HRC. Stress rupture tests are performed on the material as standard.
Alloy 286 Chemical Composition
| % | C | Mn | Si | P | S | Cr | Ni | Mo | Ti | Ai | V | B |
| Min | - | - | - | - | - | 13.5 | 24.0 | 1.00 | 1.90 | - | 0.10 | 0.0001 |
| Max | 0.08 | 2.00 | 1.00 | 0.040 | 0.030 | 16.0 | 27.0 | 1.50 | 2.35 | 0.35 | 0.50 | 0.01 |
| Var | +0.01 | +/-0.04 | +/-0.05 | +0.005 | +/-0.005 | +/-0.20 | +/-0.20 | +/-0.05 | +/-0.05 | +/-0.05 | +/-0.03 | -0.0004 +0.001 |
Alloy 286 Mechanical Properties
| Grade 286/ 660 Class | Hardening Treatment | |||
| Temp ° F | Temp ° C | Hold for | Cooling Method | |
| A and D* | 1325 +/-25 | 720 +/-14 | 16 hours | Air Cool |
| B | 1325 +/-25 | 720 +/-14 | 16 hours | Air Cool |
| C | 1425 +/-25 1200 +/-25 | 775 +/-14 650 +/-14 | 16 hours 16 hours | Air Cool Air Cool |
For more technical information download our Alloy 286 information sheet here
Applications:
Alloy 286 is used in offshore and marine applications, and the aerospace industry for:
- Fasteners
- Turbines
- Critical frames
- Components for gas turbines
- Aircraft components
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