ANALYSIS OF BISMUTH SHOT BEHAVIOR DURING CASTING

Abstract

The paper considers an analysis of the behavior of bismuth shot and offers technological recommendations  to improve alloy process during siphon casting of steel into ingots weighing 2.8 tons. In order to increase the bismuth  assimilation  in steel during siphon  casting, it is necessary to implement such parameters of bismuth  casting and supply that bismuth evaporation and evacuation of its vapors into the atmosphere is reduced to a minimum, and the bismuth dissolution  ends when a bismuth particle moves in siphon wiring channels. Linear steel  casting speed in the mold up to a height of 300 -- 400 mm is maintained in the range of 10 -- 15 mm/s, and then the speed is reduced up to 5 -- 7 mm/s and the bismuth is input. After the end of bismuth input, the linear casting speed is increased up to 10 -- 15 mm/s during 2 -- 5 seconds. The casting   is finished with speed at a rate of 1.5 -- 3 mm/s.