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Hot-rolled square tube welding steel used in construction is a major in the domestic steel market in both occupy an important ratio. However, in the past to meet specific mechanical properties of each requirement must add some special alloying elements, by chemical methods to meet the requirements of the mechanical properties of the final, which not only makes the billet production process more complicated, but also because of the added alloy so that carbon equivalent increase, thus affecting the welding properties of the material. In recent years, reinforced concrete HRB400 hot rolled ribbed steel bar production costs increase, many steel companies trying a way to reduce, or even micro-alloying elements without water cooling process to produce low cost, high strength steel. To this end, HRB400 studied through water cooling process.

Process: slab鈫抙ot charging鈫抮ough rolling heating furnace in the rolling鈫抋 flying shear (cut head and tail, accident broken off)鈫扞I tanks rolling鈫抐inishing鈫抍old double length flying shear Bed鈫抯ample鈫抍old cut length鈫抍ollection, bundling鈫抴eighed.

Welded square tube through a water-cooled technology: controlled cooling device installed after finishing mill, the use of rolling quickly after finishing deformation, immediately rapidly cooled, by welding the pipe deformation induced phase transition, the control bars under high temperature grain growth, thereby obtaining fine ferrite grain by grain refinement, and comprehensively improve the overall mechanical properties of the steel. The controlled cooling device in three sizes: small size there are three lines, test桅12,桅14,桅16,桅18mm rebar when using; the middle line specifications, test桅20,桅22,桅25mm rebar when use; there is a glimmer of large-sized test桅28 , use桅32mm rebar. The device can be achieved by the water, the water pressure adjustment, after wearing water temperature control, to make steel to obtain good mechanical properties. Steel does not require controlled cooling, use the output roller.

Reasonable control of welded square tube heating temperature, as well as to achieve optimum temperature control results, the test water pressure, start the pump number, serial number, and the cooler open cooling line number of segments are set to satisfy the premise of steel tempering temperature.