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Hypereutectic Al-Mg,Si alloy tubes were produced by a centrifugal casting process. Primary Mg,Si particles were formed in the tube periphery with graded distribution. Influence of the rotation speed and cooling rate on formation and graded distribution of Mg,Si particles was discussed. It is found that in the outer periphery the particle distribution profile at different rotation speeds is quite different from each other, while it is similar in the inner periphery. Extremely higher cooling rates during centrifugal casting resulted in a better particle distribution gradient and a much finer microstructure in the outer periphery of the tube. (C) 2000 Elsevier Science Ltd. All rights reserved.