A490 vs A354BD
| Grade Marking | Specification | Material and Treatment | Nominal Size (In.) | Mechanical Properties | Hardness Rockwell | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Proof Load Min (ksi) | Yield Strength Min (ksi) | Tensile Strength Min (ksi) | Elong % Min [9] | RA % Min [10] | Min | Max | ||||
 |
A490 Type 1 | Medium Carbon Alloy Steel, Q & T | 1⁄2" - 11⁄2" | 120 | 130 | 150 min 173 max |
14 | 40 | C33 | C38 |
 |
A490 Type 3 | Atmospheric Corrosion Resistant Steel, Q & T | ||||||||
 |
A354 Grade BD [6] | Medium Carbon Alloy Steel, Q & T | 1⁄4" - 4" | 120 | 130 | 150 min 173 max | 14 | 40 | C33 | C38 |