| 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 | ||||
 | A193 Grade B7 | Medium Carbon Alloy Steel, Q & T | 1⁄4” – 21⁄2“ | – | 105 | 125 | 16 | 50 | – | C35 |
| 25⁄8” – 4″ | 95 | 115 | 16 | 50 | C35 | |||||
| 41⁄8” – 7″ | 75 | 100 | 18 | 50 | C35 | |||||
 | A354 Grade BC | 1⁄4” – 21⁄2“ | 105 | 109 | 125 | 16 | 50 | C26 | C36 | |
| 25⁄8” – 4″ | 95 | 99 | 115 | 16 | 45 | C22 | C33 | |||