关键词: 连铸;保护渣;Mn13钢;MnO;黏度;转折温度;结晶温度

Abstract: In the continuous casting process of high-manganese steel, the redox reactions between molten steel and mold slag induce compositional changes in the slag. The infiltration of MnO further drives changes in the slag's properties, rendering the continuous casting process highly unstable. To enhance the sequence casting heats of high-manganese steel and improve the surface quality of continuous casting slabs, this study elaborates on the chemical composition, solidification characteristics, and slag-steel reaction behaviors of the Fe-Mn-C high-manganese wear-resistant steel Mn13, drawing upon the prior research efforts of domestic and international scholars. Through laboratory simulations and theoretical analyses, the reaction behavior and stability of MnO in continuous casting mold slag were investigated. Experimental results indicate that for Fe-Mn-C high-manganese steel utilizing CaO-SiO?-based mold slag, as the slag-steel reaction proceeds, the SiO? content in the slag decreases while the MnO content rises rapidly; concurrently, the Si content in the steel increases whereas the Mn content declines. Notably, the initial dosage of MnO incorporated into the mold slag exhibits no inhibitory effect on the reaction. As the MnO content in the slag gradually increases during the reaction, both the viscosity and break temperature of the slag decrease progressively. The reduced break temperature extends the duration of the liquid slag film, thereby improving the lubrication between the mold and the cast slab. These findings can provide crucial technical support for the continuous casting production of Fe-Mn-C high-manganese steel.

Key words: continuous casting; mold slag; Mn13 steel; MnO; viscosity; break temperature; crystallization temperature