Bearing steel continuous casting tail billet quality control method under unstable casting condition

The invention discloses a bearing steel continuous casting tail billet quality control method under the unstable casting condition. The problem that in the prior art, under the unstable casting condition, the quality defects such as central hole shrinkage, loose and cracks of a bearing steel tail billet are prone to occurring is solved. The bearing steel continuous casting tail billet quality control method under the unstable casting condition comprises the following steps that (1), the drawing speed is quickly and steadily decreased to zero; (2), crystallizer liquid level double-layer slag heat preservation is conducted, the crystallizer and tail end electric stirring effect is enhanced, and crystallizer weak cooling control is conducted; (3), the drawing speed is slowly and steadily increased; and (4), weak cooling of the tail billet is progressively reduced area by area. According to the bearing steel continuous casting tail billet quality control method, the condition that the quality defects such as cent