HRB500 anti-seismic reinforcing steel bar and production method

Abstract

The invention discloses an HRB500 anti-seismic reinforcing steel bar and a production method, which belong to the technical field of iron and steel smelting and are used for improving the intensity, yield ratio and stable yield strength of the anti-seismic reinforcing steel bar. The anti-seismic reinforcing steel bar is characterized by comprising the following chemical components: 0.17 to 0.25 percent of C, 0.40 to 0.80 percent of Si, 1.20 to 1.60 percent of Mn, 0.05 to 0.30 percent of Cr, 0.05 to 0.09 percent of V, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S and the balance of Fe. In the product of the invention, Cr and V are used as microalloying elements, the adding amount of the Cr is small, the solution strengthening effect of the V is enhanced, the precipitation strengthening and fine-grain strengthening effect of the V is reduced, the excessive refining of the steel grains is avoided, and the tensile strength is improved greatly at the same time of improving the yield strength; and the HRB500 anti-seismic reinforcing steel bar which meets the requirement on the performance can be produced by control over the technological parameters such as initial rolling temperature, finish rolling temperature, rolling speed and the like in the production process.

Description

Technical field [0001] The invention relates to a steel bar and a production method, in particular to a composite microalloyed HRB500E earthquake-resistant steel bar and a production method, and belongs to the technical field of steel smelting. Background technique [0002] In recent years, with the frequent occurrence of earthquakes and other geological disasters, it has aroused great concern in the construction industry for seismic reinforcement. To improve the seismic performance of steel bars, the main consideration is to stabilize the yield strength (Rel) of the steel bars, increase the strength yield ratio Rm / Rel, and increase the total elongation of the steel bars under the maximum external force. Stabilizing the yield strength of the steel bar and controlling it within a certain range can make all the stressed steel bars bear the force more evenly. If there is a large fluctuation range of the performance of the steel bar somewhere in the building structure, when the dest...

AI Technical Summary

Problems solved by technology

In the prior art, the improvement of steel strength is mostly achieved through microalloying or controlled rolling and controlled cooling to refine grains, but the effect of grain refinement on improving the yield strength of steel is greater than its tensile strength. This reduces the Rm / Rel ratio of the steel bar, which leads to the failure of the steel bar to meet the energy requirements of high strength-to-yield ratio.

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