930-MPa high-strength finished deformed steel bars and preparation technology thereof

The invention relates to the technical field of deformed steel bar production in the metallurgical industry, in particular to 930-MPa high-strength finished deformed steel bars and a preparation technology thereof. The 930-MPa high-strength finished deformed steel bars are composed of C of 0.40-0.50%, Mn of 0.80-1.20%, Si of 1.45-1.85%, V of 0.120-0.220%, S smaller than or equal to 0.030%, P smaller than or equal to 0.030% and the balance Fe. According to the preparation technology, the rolling production process route of coldly feeding billets into a heating furnace for heating, whole-process low-temperature control rolling, repeated intermittent control cooling, clamping and conveying tail steel through clamping rollers, sectioning by a multi-length flying shear, cooling by a cooling bed and indoor stacking and stack cooling is adopted. The 930-MPa high-strength finished deformed steel bars have the advantages of being low in production cost and high in quality stability. The preparation technology has the advantages that the processes are simplified, the finish rolling effect is excellent, the cooling effect after rolling is remarkable, the quality of the steel bars is not damaged or lowered, and the economic benefit and the social benefit are remarkable.