Method for reducing oxygen content in tundish through gas purging

The invention belongs to the technical field of steelmaking, and particularly discloses a method for reducing the oxygen content in a tundish through gas purging, which comprises the following steps: S1, before molten steel in a steel ladle is injected into the tundish, obtaining the volume QR of the tundish, and measuring the initial oxygen content C1 of the atmosphere in the tundish; s2, setting a target value C2 of the oxygen content of the atmosphere in the tundish; s3, counting a plurality of pieces of historical data of time required for the process of lifting the tundish roaster to the time before casting, calculating an average value of the plurality of pieces of historical data, and marking the average value as operation time t; s4, purge gas is selected, and the oxygen content C0 in the purge gas is obtained; s5, calculating the purge gas flow Q required for replacing the interior of the tundish; and S6, the number n of the purging pipelines and the pipe diameter d of the purging pipelines are set.