The difference between ST37-2 steel sheet and Q235B steel sheet in chemical composition:
| Grade | C | Mn | P | S | Si | Cu | N | Ni | Cr | Mo |
| ST37-2 | ≦0.17 | - | ≦0.050 | ≦0.050 | - | - | ≦0.009 | - | - | - |
| Q235B | 0.12-0.20 | 0.30-0.70 | ≦0.045 | ≦0.045 | ≦0.30 | - | - | - | - | - |
The difference between ST37-2 steel sheet and Q235B steel sheet in mechanical properties:
| Grade | Yield Strength | Tensile Strength | Extension |
| MPA | MPA | % | |
| ST37-2 | ≧235 | 340~470 | ≧24 |
| Q235B | ≧235 | 375~460 | ≧26 |
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