Mechanical Comparison: F1554 Grade 55 vs A449
| Grade | Marking | Size, inches | Tensile, ksi | Yield, ksi min | Elong. % min | RA % min | Meets |
|---|---|---|---|---|---|---|---|
| Grade 5 |  |
1⁄4 – 1 | 120 | 92 | 14 | 14 | NO |
| 11⁄8-11⁄2 | 105 | 81 | 35 | 35 | NO | ||
| F1554 Grade 55 |  |
1⁄2 - 2 | 75 - 95 | 55 | 21 | 30 | - |
| 21⁄4 - 21⁄2 | 75 - 95 | 55 | 21 | 22 | - | ||
| 23⁄4 - 3 | 75 - 95 | 55 | 21 | 20 | - | ||
| 31⁄4 - 4 | 75 - 95 | 55 | 21 | 18 | - | ||
| A449 |  |
1⁄4 - 1 | 120 | 92 | 14 | 35 | NO |
| 11⁄8 - 11⁄2 | 105 | 81 | 14 | 35 | NO | ||
| 15⁄8 - 3 | 90* | 58 | 14** | 35 | YES* | ||
| *Only if the tensile falls between 90-95ksi. **Elongation must meet or exceed 21%. | |||||||