Effect of inoculant introducing on improving ingot structure

Abstract

The paper deals with the inoculant–freigrator effect on some parameters of the structure: grain size and contamination index. The “beads” extracted from steelmaking slags were used as the inoculant. The effect of the fractional composition and the number of introduced “beads” were investigated. The “beads” were preliminarily crushed to the fraction of 100 – 1 500 μm and were introduced into the melt in the amount of 0,5 – 1,5 % by mass. It was established that the introduction of the “beads” of the fraction of 500 – 600 microns in the amount of 1 – 1,5 % as the inoculant contributed to the grinding of grain, reduced the tendency to segregation and dendre formation.

Keywords

• steel ingot
• melt
• structure
• grain size
• inoculant