Steel inclusion inspection method for replacing finished product inspection with casting blank inspection

The invention provides a steel inclusion inspection method for replacing finished product inspection with casting blank inspection, which comprises the following steps: selecting the width center position of a casting blank, the position of 1/4 thickness from the surface of the thickness inner arc side and the direction parallel to a throwing direction as an inspection surface for sampling, preparing a sample in a national standard metallographic sample preparation mode, and analyzing the sample by using similar electron microscope analysis equipment such as a scanning electron microscope or Aspex and the like. According to the method, inclusion scanning is carried out on the casting blank which is not smaller than 100 mm < 2 >, statistics is carried out on the area occupied by the inclusion, and the ratio of the total area occupied by the inclusion to the scanning area is taken as a judgment basis, so that the inclusion level of the casting blank can be quantitatively judged before the casting blank is rolle