Centrifligal Cast tubes have been produced with ZA 8, ZA 12 and ZA 27 alloys with different rotational speeds of the mould (Viz. 400, 600 and 800 rpm). From the past research work, it was understood that cast tubes for ZA 8 and ZA 12 alloys with good mechanical properties were produced, with the mould rotation at 600 rpm. This observation was explained without the addition of refiners. In the present work, a uniform cylinder with good mechanical properties was produced with ZA8 alloy at 400 rpm only. This was due to the influence of refiner 1% Al-Ti-B2 along with low aluminium content and lower rotational speed of the mould. With higher rotational speeds of the mould, increase in the composition of aluminium and refiner reduce solidification rate of the melt forming irregular shaped cast tube with ZA12 and ZA 27 alloys.
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