ANALYSIS REGARDING CHEMICAL SEGREGATION OF CENTRIFUGALLY-CAST STAINLESS STEEL BILLETS FOR SEAMLESS PIPES

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.