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| Steel grade | C | Si | Mn | P | S | Cu | Ni | Cr | V | Nb | Ti | Al |
| 20# | 0.17~0.23 | 0.17~0.37 | 0.35~0.65 | ≤0.035 | ≤0.035 | ≤0.25 | ≤0.30 | ≤0.25 | / | / | / | / |
| 45# | 0.42~0.50 | 0.17~0.37 | 0.50~0.80 | ≤0.025 | ≤0.02 | ≤0.20 | ≤0.25 | ≤0.25 | / | / | / | / |
| 25Mn | 0.22~0.29 | 0.17~0.37 | 0.70~1.00 | ≤0.03 | ≤0.03 | ≤0.20 | ≤0.30 | ≤0.25 | / | / | / | / |
| 27SiMn | 0.24~0.32 | 1.10~1.40 | 1.10~1.40 | ≤0.035 | ≤0.035 | ≤0.30 | ≤0.30 | ≤0.30 | / | / | / | / |
| Q345B (St52) | ≤0.20 | ≤0.55 | 1.00~1.60 | ≤0.04 | ≤0.04 | / | / | / | 0.02~0.15 | 0.015~0.06 | 0.02~0.20 | / |
| Q345D(St52) | ≤0.18 | ≤0.55 | 1.00~1.60 | ≤0.03 | ≤0.03 | / | / | / | 0.02~0.15 | 0.015~0.06 | 0.02~0.20 | ≥0.015 |