The invention provides a nitrogenous
niobium vanadium microalloying 500MPa and 550MPa high-intensity aseismic reinforcing
steel bar and a melting method. The high-intensity aseismic reinforcing
steel bar comprises the following ingredients in percentage by
mass: 0.20 to 0.25 wt percent of C, 0.35 to 0.55 wt percent of Si, 1.35 to 1.58 wt percent of Mn, 0.013 to 0.025 wt percent of V, 0.019 to 0.032 wt percent of Nb, 0.065 to 0.085 wt percent of N, at most 0.040 wt percent of S, at most 0.040 wt percent of P and the balance Fe and unavoidable impurities. The reinforcement effect of microalloy V and Nb is sufficiently exerted through increasing the N and decreasing the V and the Nb, the addition of the ferrocolumbium and
vanadium nitrogen alloy is reduced, and the addition of noble
alloy issaved. Compared with the traditional
vanadium nitrogen alloy microalloying 500MPa high-intensity reinforcing
steel bar , the nitrogenous
niobium vanadium microalloying 500MPa and 550MPa high-intensity aseismic reinforcing steel bar provided by the invention has the advantages that the alloying cost of the process is reduced by 65 to 75 Yuan / t steel over the same periods, the economic benefit is obvious, the process production cost is low, the applicability and the
controllability are high, the produced 500MPa and 550MPa high-intensity reinforcing steel bar is widely applicable to highrise andlarge-scale constructional
engineering, and the aseismic performance and the
welding performance of the reinforcing steel bar are good.