Abstract:
The experience of using coal flotation waste as a weakly exothermic insulating backfill for
insulating the head part of forging dead-melted steel ingots is presented. It has been shown that when using
weakly exothermic fills based on single-component fills in the form of coal flotation waste, it is possible to reduce
the chemical heterogeneity of the ingot by producing a closed shrinkage cavity, which allows halving heat loss
and depth of penetration of shrinkage looseness into the body of the ingot, reducing the segregation of impurities,
compacting the head part of the ingot and increasing the yield; moreover, the profitable part of the ingot is more
dense and less contaminated with nonmetallic inclusions. The studied patterns of the formation of a closed
shrinkage cavity with a dense “bridge” in the head part of a dead-melted 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 waste (coke screenings, coal flotation waste).
