Online waste heat quenching process of U71MnU75V rolled steel balls

The invention discloses an online waste heat quenching process of U71MnU75V rolled steel balls and particularly relates to an online waste heat quenching process of U71MnU75V rolled steel balls in thefield of steel ball production. The process comprises several steps as follows: A, steel is heated; B, the heated steel is rolled into steel balls; C, the rolled steel balls are precooled; D, the precooled steel balls are quenched; E, the quenched steel balls are subjected to waste heat self-tempering. Waste heat of the rolled steel balls is ingeniously used for quenching, and steel balls are notrequired to be heated during quenching treatment, thus, time is saved and energy consumption is reduced. After quenching, the waste heat of the rolled steel balls is directly used for tempering treatment, the steel balls are not required to be reheated, the technological process is greatly shortened, energy consumption is reduced, and the production cost is saved. The comprehensive mechanical performance of the steel ball