Abstract
The experience of using coal flotation waste (CFW) as a weakly exothermic insulating backfill for insulating the head part of forging steel ingots is presented. It has been shown that when using weakly exothermic fills based on single-component fills in the form of CFW, it is possible to reduce the chemical heterogeneity of the ingot with the production of a closed shrinkage cavity, it allows to halve heat loss, the depth of penetration of shrinkage looseness into the body of the ingot, reduce the segregation of impurities, and compact the head part of the ingot and increase the yield, and the profitable part of the ingot is more dense and less contaminated with non-metallic inclusions. The studied patterns of the formation of a closed shrinkage cavity with a dense “bridge” in the head part of a quiet steel ingot made it possible to develop and implement a technology for casting large forging ingots of sufficiently high quality using weakly exothermic heat-insulating materials based on metallurgical production waste (CFW).