Manufacturing method of high-strength anti-seismic reinforcing steel bar with high tensile-to-yield ratio

The invention belongs to the technical field of high-strength steel bars, and discloses a manufacturing method of a high-strength anti-seismic steel bar with a high tensile-yield ratio, which comprises the following steps: 1) smelting a casting blank: smelting molten steel through a converter and continuously casting to form a steel billet; 2) heating the steel billet, wherein the steel billet enters a heating furnace to be subjected to three-section heating, and the heating process involves control over the temperature, the heating speed and the heating time; 3) rough rolling: controlling the temperature when entering a rough rolling unit; 4) finish rolling: controlling the temperature when the rolled piece enters the finish rolling unit and the linear speed when the rolled piece exits from the finish rolling unit; and (5) cooling: cooling the rolled piece subjected to finish rolling through a multi-stage controlled cooling water tank, then carrying out double-length shearing, and finally cooling on a coolin