Filter effectiveness in the manufacture of high-chromium steel castings

The paper presents the results of studies on the application of ceramic filters in the manufacture of cast hearth plates at the West Pomeranian University of Technology in Szczecin. Castings were poured from the heat-resistant G-X40CrNiSi27-4 cast steel in green sand moulds. The development of casting manufacturing technology included the following studies: analysis of the causes of nonmetallic inclusions in high-chromium alloys, computer simulation of mould filling with liquid metal using standard gating systems without filters and new systems with the built-in filter, making pilot castings, quantitative determination of the content of non-metallic inclusions, determination of the oxygen and nitrogen content, and evaluation of the extent of occurrence of the raw casting surface defects. As a result of the conducted studies and analyses, the quality of produced castings was improved, mainly through the reduced content of non-metallic inclusions and better raw casting surface quality.