Centrifugal castings are formed by pouring molten metal into a rotating die and offer a number of benefits over other casting methods. Since the bar is formed under centrifugal force of up to 200 G, it exhibits a denser, closer-grained structure. In fact, the physical properties of centrifugally cast materials such as tensile, creep, and fatigue strength are up to 30% higher than in sand or investment castings.
During the process, heavier metal is forced outward which displaces the lighter oxides and impurities causing them to float toward the inner surface to be easily removed when machining the inside bore. Conventional gravity and static castings solidify from both the inside and outside surfaces which often results in defects such as internal shrinkage, gas porosity, blowholes and non-metallic inclusions. Conversely, centrifugal castings solidify in a single direction from the outside diameter which results in a much lower occurrence of defects.
Centrifugal casting produces a hollow bar that is of excellent structural integrity throughout its thickness and can be made to your specified inner and outer dimensions and quantity at a price considerably lower than static casting methods.