The difference between GL grade A ship plate and Q235B ms plate in chemical composition:
| Grade | C | Mn | P | S | Si | Cu | N | Ni | Cr | Mo | |
| GL grade A | 0.21 | ≧2.5*C | ≦0.035 | ≦0.035 | ≦0.50 | - | - | - | - | - | |
| Q235B | 0.12-0.20 | 0.30-0.70 | ≦0.045 | ≦0.045 | ≦0.30 | - | - | - | - | - |
The difference between GL grade A ship plate and Q235B ms plate in mechanical properties:
| Grade | Yield strength | Tensile strength | Extension |
| MPA | MPA | % | |
| GL grade A | ≧235 | 400~520 | ≧21 |
| Q235B | ≧225 | 375~460 | ≧25 |
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