Filtration of Steel Castings

摘要

The use of ceramic foam filters can dramatically improve the aesthetics and structural quality of castings. It is important to ensure the flow of metal after the filter is non-turbulent by avoiding or minimising free fall and high stream velocities as these actions can undo some of the benefits of filtration. It should also be noted that filters are primarily intended to remove micro inclusions from liquid steel and not to provide a license for poor practice. The performance of filters will be greatly impaired if the metal is dirty as they will quickly block and stem the flow of metal. Filters can only be successfully used in combination with good melting, pouring, moulding and gating practice.