Abstract: The solidification structure and mechanical properties of 1Cr25Ni20Si2 tube blank were investigated, which was acquired through the joint fields of electromagnetic and centrifugal force. The results show that if a steady magnetic field of appropriate magnetic induction is applied in centrifugal casting process, the solidification structure of the blank can be improved markedly with its impact toughness and elongation improved correspondingly. But the mechanical properties of the blank will drop if increasing the magnetic induction further after it reaches >0.04 T. By analysis, it was concluded that electromagnetic stirring, induced due to interaction between steady magnetic field and rotating metal melt, is radical reason that solidification structure and mechanical properties of heat-resistant tube blank are improved.