LOW-COST HIGH-PERFORMANCE Q370QE-HPS BRIDGE STEEL AND PRODUCTION METHOD

摘要

The present invention relates to the technical field of steel production. Disclosed is low-cost high-performance Q370qE-HPS bridge steel, comprising the following chemical components in mass percentage: C: 0.05%-0.08%, Si: 0.10%-0.40%, Mn: 1.61%-1.70%, P≤0.015%, S≤0.0030%, Nb: 0.030%-0.050%, Ti: 0.010%-0.018%, residual Ni≤0.05%, Cr: 0.20%-0.30%, residual Mo≤0.05%, residual Cu≤0.05%, residual B≤0.05%, N≤0.005%, Al: 0.020%-0.050%, and the balance of Fe and impurities. By using a TMCP rolling process, a bridge steel plate which has a low yield ratio and excellent welding performance and satisfies standard requirements is obtained, thereby improving market competitiveness of enterprises.