Effect of Flux Composition on Refining and Reoxidation Behavior of Si-Killed Stainless Steel During Ladle and Tundish Metallurgy

EasyChair Preprint 9568

Abstract

The effect of slag composition on the refining and reoxidation behavior of Si-killed 316L stainless steel during ladle and tundish processes were investigated in an induction furnace equipped with a MgO crucible under high purity Ar atmosphere at 1873 K and 1773 K, respectively. For the ladle refining process, the total oxygen (T.O.) content decreased with increasing the Vee ratio (CaO/SiO2=C/S) of the CaO-SiO2-Al2O3-MgO-CaF2 ladle refining slag, but the effect of CaF2 content on the T.O. can be neglected at high C/S condition. The CaO-SiO2-Al2O3-MgO system liquid inclusions transformed from MnO-SiO2-Cr2O3 system liquid inclusions can be found as the C/S is less than 1.3, and the formation of spinel and MgO inclusions were observed under conditions of the C/S=1.7 to 2.3, respectively. For the tundish metallurgy process, the liquid and SiO2-rich Mn-Si-O system inclusions were found as the liquid steel reacted with rice husk ash (RHA) and RHA-CaO-SiO2. The liquid Mn-Si-Al-O system inclusions were observed as reacted with RHA-CaO-Al2O3 flux. The number density of inclusions increased, decreased, and remained constant with the reaction time when the liquid steel reacted with RHA, RHA-CaO-Al2O3, and RHA-CaO-SiO2 fluxes, respectively. The results indicated that the reoxidation of the liquid steel is aggravated as the RHA was used, whereas the RHA-CaO-Al2O3 can facilitate the removal of the inclusions during the tundish metallurgy process

Keyphrases: 316L stainless steel, Inclusions, Ladle metallurgy, Reoxidation, Tundish metallurgy

@booklet{EasyChair:9568,
  author    = {Shengchao Duan and Taesung Kim and Jinhyung Cho and Joohyun Park},
  title     = {Effect of Flux Composition on Refining and Reoxidation Behavior of Si-Killed Stainless Steel During Ladle and Tundish Metallurgy},
  howpublished = {EasyChair Preprint 9568},
  year      = {EasyChair, 2023}}