Effects of Al Addition on the Reaction between High‐Manganese Steel and CaO–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–MgO Slag
Huixiang Yu, Dexin Yang, Muming Li, Ni Zhang
Abstract
High‐manganese steel has garnered much attention in recent years. Precise control on steel composition and improvement of cleanliness are very important for the commercial production of this steel grade. Herein, the effect of Al addition on steel and slag compositions as well as inclusions of high‐manganese steel is investigated by slag–steel reaction. The results show that Al content in steel decreases, Si increases greatly, and Mn increases a little after Al addition. Correspondingly, the content of Al 2 O 3 in slag increases and SiO 2 and MnO decrease compared with those without Al additions. All these phenomena indicate that Al instead of Mn reacts with SiO 2 in slag during the slag–steel reaction after Al addition. The compositions of the final slags are close to the saturation lines of (Mn, Mg)O and MgO after the slags react with Fe– x Mn ( x = 10, 20 mass%) and Fe– x Mn–1Al ( x = 10, 20 mass%) steels. After Al addition, the inclusions in steel also change, with the main component from MnO to MgO, the shape from spherical to faceted, and the inclusion size showing an increasing trend.