Q345 has a tensile strength range of 490-675 Mpa, while the Q235 has a 375-500 Mpa range.
Q345 has a yield strength of ≥ 345 Mpa, while the Q235 has a ≥ 235 Mpa.
Q345 has an elongation rate after fracture of ≥ 21%, while the Q235 has ≥ 26%.
There may be some end users who question the quality and the reliability of these steel types. Quite possibly this is due to the fact that each steel type has different chemical contents thus some properties such as welding properties may be compromised. We hope that the above information will be helpful and serve as a guide on which steel type would be perfect for each application.