The difference between SM490B steel plate and Q345B steel plate in chemical composition:
| Grade | C | Si | Mn | P | S | Nb | V | Ti | Cr | Ni | Cu | N | Mo |
| SM490B | ≦0.20 | ≦0.55 | ≦1.60 | ≦0.035 | ≦0.035 | - | - | - | - | - | - | - | - |
| Q345B | ≦0.20 | ≦0.50 | ≦1.70 | ≦0.035 | ≦0.035 | ≦0.07 | ≦0.15 | ≦0.20 | ≦0.30 | ≦0.50 | ≦0.30 | ≦0.012 | ≦0.10 |
The difference between SM490B steel plate and Q345B steel plate in mechanical properties:
| Grade | Yield Strength | Tensile Strength | Elongation |
| (Mpa) | (MPa) | (%) | |
| SM490B | ≧295 | 490-610 | ≧18 |
| Q345B | ≧315 | 470-630 | ≧19 |
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