The difference between A36 steel plate and Q235B steel sheet in chemical composition:
| Grade | C | Mn | P | S | Si | Cu | N | Ni | Cr | Mo |
| A36 | 0.26 | - | ≦0.040 | ≦0.050 | ≦0.40 | ≧0.20 | - | - | - | - |
| Q235B | 0.12-0.20 | 0.30-0.70 | ≦0.045 | ≦0.045 | ≦0.30 | - | - | - | - | - |
The difference between A36 steel plate and Q235B steel sheet in mechanical properties:
| Grade | Yield strength | Tensile strength | Extension |
| MPA | MPA | % | |
| A36 | ≧250 | 400~550 | ≧20 |
| Q235B | ≧235 | 375~460 | ≧21 |
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