The difference between ST52-3 steel plate and Q345B steel plate in chemical composition:
| Grade | C | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | N | Mo | B | Als |
| ST52-3 | 0.22 | - | - | 0.040 | 0.040 | - | - | - | - | - | - | - | - | - | - |
| Q345B | 0.2 | 0.5 | 1.7 | 0.030 | 0.030 | 0.07 | 0.15 | 0.2 | 0.3 | 0.5 | 0.3 | 0.012 | 0.1 | - | - |
The difference between ST52-3 steel plate and Q345B steel plate in mechanical properties:
| Grade | Yield Strength | Tensile Strength | Elongation |
| (Mpa) | (MPa) | (%) | |
| ST52-3 | 335 | 490-630 | 19 |
| Q345B | 325 | 470-630 | 19 |
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