Continuous casting method for eliminating netted cracks of Ni-free 09CrCuSb steel casting blank

The invention relates to a continuous casting method for eliminating netted cracks of a Ni-free 09CrCuSb steel casting blank. The steel comprises the following chemical components in percentage by weight: 0.06%-0.10% of C, 0.20%-0.35% of Si, 0.45%-0.60% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.80%-1.00% of Cr, 0.25%-0.35% of Cu and 0.04%-0.10% of Sb. The method comprises the key process steps that (1) when molten steel flows into a crystallizer from a tundish, the water volume of the crystallizer is controlled to be 158 t/h to 160 t/h, and the electromagnetic stirring parameters of the crystallizer are that the current is 450 A, and the frequency is 3 Hz; (2) when a casting blank continuously cast from the crystallizer enters a secondary cooling chamber, the secondary cooling specific water flow is 1.19-1.21; and (3) when the casting blank pulled out of the secondary cooling chamber enters a withdrawal and straightening machine, the blank temperature range of the casting