Liquid Steel Treatment in the Ladle with Non-oxidizing Synthetic Slag

Abstract

Sy nopsis S)lfllhetic slags wilh low FeO content were produced by way of trial with a view to purifying liquid steel by p reventing its reoxidation by the slag in the ladle. Using the J-ton E.F., low-carbon aluminium-killed steel was tested on a semi-industrial scale. The e.fJects of slags and lining materials by types were investigated, and the following results were obtained: (1) If the F eO content in slag in the ladle is decreased to less than 2 % , liquid steel is /JUrijied and the total oxygen decreases to below 40 NJln. Lmge inclusions (;:;; 100 I') are eliminated. (2) Loss of so l. A I in liquid steel is caused not only by slag but also by lining material. En the case of treatment with synthetic slag, relative contribution of lining material to the loss of so l. A I is greater than in the case of treatment with normal slag. H owever, lhis contribution can be suppressed by the use of a lining material with high A I 2 0 a conlenl. (3) The velocity of so l. A I loss is controlled by the diffusion of oxygen in the slag.

Kinetic Modeling of Nonmetallic Inclusions Behavior in Molten Steel: A Review

“…The spinel-type inclusions were formed from the reaction between Al 2 O 3 inclusions and magnesium that originated from the slag phase, as given in Eqs. [21] and [23]. A similar trial for the inclusion evolution during the reoxidation of Al-Ti-containing steel by the CaO-SiO 2 -Al 2 O 3 -MgO slag was performed by Ren et al [333] They employed k m as given in Eq.…”