Nano hub casting production line and cast steel preparation method thereof

The invention discloses a nano hub casting production line and a cast steel preparation method thereof, and belongs to the field of hubs. The production line comprises a plurality of intermediate frequency furnaces arranged in front of a clarification tank, the inner side of the front tank wall of the clarification tank is of an inclined structure, a conveying belt is arranged in front of a discharge port of the clarification tank of a steel refining furnace, a plurality of hub manufacturing molds are arranged on the conveying belt, the molds are fusible material inner molds, and the peripheries of the inner molds are coated with ceramic shells formed after refractory mortar is dried. The casting comprises the following components: 0.5-0.8% of Cr, 0.55-0.8% of Mn, 0.15-0.2% of C, 0.03-0.05% of Ni, 0.01-0.03% of Nb, 0.03-0.06% of Al, 0.06-0.1% of Cu, 0.02-0.05% of Co, less than or equal to 0.03% of P + S + Ca, less than or equal to 0.02% of Mo + W + V + Ti + Sc + Sn and the balance of Fe, all the components ex