连铸时超低碳钢结晶器内钢液增碳的研究

A Study on Carbon Pick-up in Ultra Low Carbon Molten Steel in Mold during Continuous Casting

通过理论解析和实验测定，研究不同类型和配入量的碳质材料的连铸保护渣对0．003％C超低碳钢连铸结晶器（200mm×100mm）内钢液增碳的影响。结果表明，铸坯速度2．0m/min在稳态浇注条件下，超低碳钢连铸结晶器内钢液增碳量仅为（1．2～2．4）×10^-6；在非稳态浇注时期，钢液最大增碳量达67．9×10^-6。保护渣的3种配加碳质材料中，石墨对结晶器内钢液增碳量影响最大，碳黑次之，活性碳最小。随着渣中碳质材料配入量的增加，钢液增碳量增大。

The effect of mold powder with different type and addition of carbon materials on carbon pick-up in 0.003%C ultra low carbon molten steel in 200 mm× 100 mm mold has been studied by theoretical calculation and experimental measurement. The results showed that with casting rate 2.0 m/min, on steady condition of continuous casting, the carbon pick-up content in steel was （ 1.2 ～2.4） × 10^-6, and on non-steady condition of continuous casting, the maximum carbon pick-up content in steel was 67.9 × 10^-6. In 3 hinds of addition carbon materials the carbon pick-up content in molten steel in mold added graphite was highest, added carbon black next and added active carbon lowest; and with increasing the amount of carbon materials addition in powder, the carbon pick-up content in steal increased.