Abstract: To counter this situation that the internal structure of high speed steel roll collar is loose in static state casting and the composition of high speed steel roll collar is easy to incline to separating out in centrifugal casting. The effect of extruding casting on the mechanical properties and physical properties of high speed steel roll collar is researched. The results obtained show that extruding casting high speed steel roll collar has compact structure, even composition and high and even hardness. The application in industry shows that the service life of extruding casting high speed steel roll collar obviously excels high Ni Cr indefinite chill cast iron roll collar’s.

Key words: Extruding casting, High speed steel, Inclining to separating, Roll collar, Wear resistance