The practice indicates that the quality of liquid steel is improved, the inclusion and gas content is decreased. The steel properties conform the national standards.
When liquid metal flows through the filter, there will be vacuum produced in filter's hole. Inclusion and gas in liquid metal were absorbed to the filter by vacuum, that cause liquid metal cleaning.
An unreasonable liquid steel flow behaviors have an effect on inclusion flotation, bubble distribution, liquid mold flux fluid capability and spreadability, shell growth, etc.