Abstract
In this test, we used Feedex No. 3 (Foseco in England), which was made for the purpose to use in a steel casting. The sleeve used was made of 5% H2O and Feedex. Its density was 1.34 gr per cc. The quantitive of Feedex was determined by applying Lazendorfer's calculation formulas, which is written in “An Exothermic Feeding Compound” in the Iron and Steel, June, 1952. According to the results of calculation, we were able to save the volume of the riser by 57∼74% by using Feedex-in other word, the recovery of products was improved to the extent 13∼24%. As the price of Feedex is very high, the casting weight needs to be comparatively large. We applied this heat insulator (Feedex) to the high manganese steel casting tyre and obtaimed the good result.
