Controlled cooling system for hot rolled bearing steel bars

The utility model discloses a controlled cooling system for hot rolled bearing steel bars. The controlled cooling system comprises a cooling bed arranged on the back side of a finishing mill group on a rolling center line, and a first water tank and a second water tank are arranged between the finishing mill group and the cooling bed and located on the rolling center line; the first water tank is fixedly arranged and located on the back side of the finishing mill group, and the second water tank is movably arranged on the back side of the first water tank. The temperature of the rolled pieces is controlled by adjusting the relative distance between the second water tank and the first water tank. The controlled cooling system is suitable for producing the bars in different specifications, net carbon grades of the hot rolled bearing steel bars in large specifications and medium specifications can be effectively reduced, and the adaptability is high.