The invention provides an HRB500E Nb-Ti microalloy high-strength aseismic reinforcement bar and a production process and belongs to the technical field of
metallurgy. Chemical components of the reinforcement bar comprise, by weight, 0.20-0.25% of C, 0.005-0.03% of Ti, 0.01-0.04% of Nb, 0.60-0.80% of Si, 1.40-1.60% of Mn, less than or equal to 0.045% of P, less than or equal to 0.045% of S, and thebalance Fe and inevitable impurities. A preparation method comprises the steps of (1) converter
smelting, specifically, adding
ferrosilicon, silicomanganese and ferrocolumbium alloys in the steel tapping process, conducting deoxidation alloying, adding
ferrotitanium and conducting soft blowing to feed the mixture to be subjected to
continuous casting and pouring; (2)
continuous casting, specifically, conducting protective
casting in the whole
continuous casting process; and (3) heating and rolling, specifically, conducting shearing through the water pre-cooling process and then conducting check and warehousing, wherein according to the specifications of the reinforcement bar, the yield strength of the reinforcement bar is greater than or equal to 500 MPa, the tensile strength is greater than or equal to 630 MPa, the yield strength ratio is greater than or equal to 1.25, the yield standard ratio is less than or equal to 1.30, the percentage elongation after fracture is greater than orequal to 15, and the maximum elongation Agt is greater than or equal to 9.0%.