Influence of Quick Cooling Process Parameters after Rolling on Reinforcing Steel Bar Performance

Using the quick cooling device located at the exit of final bar mill st and,The influence of main process parameters on the properties of reinforcing steel bar was tested and analyzed.The results show that the interval time between the final st and and the initial cooling can be shortened to increase the strength of reinforcing bar.Increasing water flow,cooling time or cooling water pressure can improve the strength of reinforcing bar,but it will decrease the elongation.Reducing self tempering temperature can increase the strength of reinforcing bar,but it will also decrease the elongation.Based on the research results,using the steel grade of Q235 produced at a overseas bar mill,controlling the self tempering temperature of Ø18 mm rebar in 570~630℃,Ø22 mm rebar in 550~650℃ and Ø25 mm in 460~520℃,it can obtain qualified reinforcing steel bar in accordance with the national st and ard.