关键词: Mn13钢, AOD炉, 凝固, 过热度, 脱磷

Abstract: Mn13 high manganese wear-resistant steel exhibits excellent wear resistance under strong impact wear conditions. Mn13 steel mold casting products have been widely used in China for a long time, and Mn13 steel produced by continuous casting-hot rolling process has higher strength and toughness, longer service life than mold castings. However, the smelting and continuous casting production is extremely difficult. Based on the analysis of the chemical composition, properties and solidification characteristics of Mn13 steel, a new smelting and continuous casting process of Mn13 was developed based on the equipment conditions of a steel plant. Under the new process, silicon and phosphorus in molten iron could be removed through converters, and the mass fraction of phosphorus in the molten steel could be controlled below 0.010%.By adding high carbon ferromanganese and electrolytic manganese in stages in AOD furnace, the yield of alloy was significantly improved while achieving high carbon tapping. By fine-tuning the composition and compensating for temperature through LF, there was no need for vacuum treatment after LF treatment, which had the advantage of low smelting cost. The new process achieved stable continuous casting of Mn13 steel by reducing the superheat of molten steel, determining a reasonable cooling system and casting speed, using weak electromagnetic stirring and soft reduction at the end of solidification.

Key words: Mn13 steel, AOD furnace, solidification, superheat, dephosphorization