Alloy A-286
Alloy A286 is a precipitation hardenable alloy, which is used extensively in the petro-chemical, aerospace and oil field industries, especially for fasteners, stud-bolts
The mechanical properties detailed are typical of most oil-field equipment companies requirements. The main difference between these figures and the properties of ASTM A638 Grade 660 is that the 0.2% offset yield strength is increased from 85,000 psi up to 105,000 psi.
To obtain this a secondary precipitation treatment is often necessary. The maximum hardness figure of 35 HRC is from NACE MR-01-75 and differs from ASTM A638 grade 660 which is 248 HBN minimum. Alloy A-286 is also used for extrusion liners and dies.
National Specification
| ASTM | UNS | SEA AMS | British Standard | Werkstoff |
|---|---|---|---|---|
| A453 A638 Grade 660B Grade 660D |
S66286 | 5731 5732 |
HR 52/650 | 1.4943 1.4944 |
Material may also be released to Customer Specifications, subject to enquiry.
Technical Data
Nominal Composition by Percent
| C | Mn | Si | P | S | Cr | Ni | Mo | Ti | Al | V | B | Cu | Fe | - | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | - | - | - | - | - | 13.0 | 24.0 | 1.0 | 1.9 | - | 0.1 | .001 | - | Bal | % |
| Max | 0.08 | 2.0 | 1.0 | 0.40 | 0.30 | 16.0 | 27.0 | 1.5 | 2.35 | 0.35 | 0.5 | .010 | 0.30 | - | % |
Typical Mechanical Properties (Oil patch)
| Solution Annealed & Precipitation Treated(Aged) |
KSI | MPa | % |
|---|---|---|---|
| Tensile Strength, min | 145,000 | 1000 | - |
| Yield Strength (0.2% offset), min |
105,000 | 724 | - |
| Elongation in 2" (or 50mm) or 4D, min |
- | - | 15 |
| Reduction of Area | - | - | 25 |
| Hardness(Rockwell) | 24-37 | - | - |