Abstract: The regularity and causes of chemical segregation of various elements are analysed based on the measuring results of element contents in different areas of a centrifugally-cast billet of austenitic stainless steel. The conclusion is that the said segregation resulted from the bitter up-and-down motion of the alloisophase mass-points of the alloy elements formed in the centrifugal field due to the difference in density between the said mass-points and the liquid steel and non-equilibrium crystallization due to the non-homogeneity of solute distribution.