Compared with traditional slabs, the heat flow in the mold of thin slab continuous die casting is large, and the solidified billet shell near the meniscus generates higher surface tension, which often leads to the formation of longitudinal surface cracks. Especially when the carbon content is in the range of 0.65% to 0.15%, the higher the temperature at which unidirectional austenite is formed during the solidification process, the larger the austenite grains of the cast steel will be, the lower the plasticity of the steel will be, and the easier it will be to Produce surface cracks. For this reason, this carbon content area should be avoided as much as possible. If you produce cold-rolled strip coils, you must have high-quality molten steel, especially the requirements for raw materials; if you make steel in an electric furnace, you should add sponge iron and use high-quality scrap steel; the requirements for aluminum and nitrogen are also very strict to avoid nitriding The precipitation of aluminum embrittles the austenite grain interface, causing corner transverse cracks or transverse cracks at vibration marks in the continuous casting billet. (Especially below 900℃).
Link to this article：Requirements for molten steel composition in thin slab continuous casting
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