Ingredient Design of 1Cr13 Stainless Steel Continuous Casting Protective Slag
In the process of producing 1Cr13 stainless steel,serious longitudinal cracks breakout and transverse dents ap-pear in the casting billet.FactSage8.2 thermodynamic software was used to calculate ternary and quadruple phase dia-grams to design the ingredient of the protective slag.At the same time,the solidification characteristics of 1Cr13 stainless steel were calculated.As this steel is a peritectic steel,it will produce a sharp volume contraction during the solidifica-tion process,resulting in longitudinal cracks in the weak part of the blank shell.In order to avoid the dents and longitudi-nal crack caused by the uneven raw shell,the basicity of the protective slag should be improved,the crystallization prop-erty of the protective slag should be improved,and the heat transfer control ability of the protective slag should be im-proved too.The basicity of the new protective slag is 1.5,the slag is 6％MgO,2％Li2O,16％Al2O3,8％Na2O,3％B2O3,10％CaF2.The melting point of the original slag of 1Cr13 stainless steel is 1 155 ℃,the constant temperature viscosity is 0.442 Pa·s,and the transition temperature is 1 140 ℃.The melting point of the new protective slag is 1 120 ℃,the vis-cosity is 0.304 Pa·s,the transition temperature is 1 171 ℃,and the crystallization temperature is 1 270 ℃.After actual production,the surface quality of the casting billet is obviously improved.
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