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针对含硼中碳钢铸坯角部裂纹问题,通过检测保护渣凝固液渣层硼含量发现钢中硼的质量分数为0.001 3%时,进入渣中B2O3的质量分数为0.74%,并测得原渣样和液渣样粘度分别为0.122、0.12Pa·s(1 300℃),认为钢中硼含量对保护渣性能影响较小,无需针对含硼钢设计特殊保护渣。对原中碳钢保护渣性能进行了优化,碱度(R)从1.23增加到1.27;1 300℃下粘度从0.165Pa·s降低到0.123Pa·s;1 350℃下熔速从22kg/h增加到27kg/h;熔点从1 085℃增加到1 155℃,铸坯角部裂纹得到了明显的控制。
Aiming at the problem of the corner crack of boron-containing medium carbon steel slab, the mass fraction of B2O3 entering the slag is 0.74% when the content of boron in steel is 0.001 3% The original slag-like and liquid slag-like viscosities were 0.122, 0.12 Pa · s (1 300 ℃), respectively. It was concluded that the content of boron in steel had little effect on the properties of the mold flux and no special mold flux for boron-containing steel was needed. The properties of the original medium carbon steel mold fluxes were optimized, the basicity (R) increased from 1.23 to 1.27, the viscosity decreased from 0.165Pa · s to 0.123Pa · s at 1 300 ℃, and the melting rate increased from 22kg / h Increased to 27kg / h; the melting point increased from 1 085 ℃ to 1 155 ℃, the cast slab corner crack was obviously controlled.