The difference between A516 GR 70 pressure vessel steel plate and Q345R boiler steel plate in chemical composition:
| Grade | C | Si | Mn | P | S | Alt |
| A516 GR 70 | ≦0.27 | 0.13-0.45 | 0.79-1.60 | ≦0.035 | ≦0.035 | |
| Q345R | ≦0.20 | ≦0.55 | 1.20-1.60 | ≦0.015 | ≦0.025 | ≧0.020 |
The difference between A516 GR 70 pressure vessel steel plate and Q345R boiler steel plate in mechanical properties:
| Grade | Yield Strength | Tensile Strength | Elongation |
| (Mpa) | (MPa) | (%) | |
| A516 GR 70 | ≧260 | 485-620 | ≧21 |
| Q345R | ≧345 | 510-640 | ≧21 |
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