Abstract: Pulse electromagnetic field is imposed during the centrifugal casting high speed steel to solve the segregation of elements and carbide． The main components of elements in high speed steel are designed as 1.5%~2.5% C,4.0~6.0% V,4.0%~6.0% W,1.5%~4.5% Mo,2.0%~4.0% Cr and 0.04%~0.18% Zr． The frequencies of pulse electromagnetic fields were set at 1,2,4,6,8 and 10Hz levels separately． The corresponding magnetic induced intensities of mould center were 0．2~5T． The actual elemental components were analyzed using Atomic Emission Spectrometer． During data processing parameter of variance was used to characterize the fluctuation and segregation of elements and carbides． After heat treatment of quenching and tempering several mechanical properties of materials were tested． The results show that the fluctuation and segregation have been inhibited after using pulse electromagnetic filed． The comprehensive mechanical properties are enhanced obviously,which include hardness,tensile strength,bending strength and impact toughness． The average increase amplification is about 10% compared to that without using pulse electromagnetic field．

Key words: high speed steel roller, centrifugal cast, pulse electromagnetic fields, mechanical properties