使用热流密度低的缓冷型保护渣可缓解包晶钢浇铸过程中因包晶相变导致的表面纵裂纹产生。当新型助熔剂氧化钴添加量从1%增加到2%时,保护渣热流密度呈现下降趋势,当从2%增加到2.5%时,保护渣热流密度呈现增加趋势。并且氧化钴添加到包晶钢保护渣中,实验样热流密度均小于工业保护渣。通过对色度进行研究,发现试样热流密度与色度相对应,说明氧化钴降低保护渣的热流密度是通过改变玻璃相的色度来实现的。 The use of slow-fluxing mold flux with low heat flux can alleviate the generation of longitudinal longitudinal cracks caused by peritectic transformation in the process of pericardium casting. When the flux of new flux increased from 1% to 2%, the flux density of the fluxes showed a downward trend. When the flux increased from 2% to 2.5%, the flux density of flux increased. And the addition of cobalt oxide to the peritectic steel mold flux, the experimental sample heat flux density is less than the industrial mold flux. Through the study of the chromaticity, it is found that the heat flux density of the sample corresponds to the chromaticity, which shows that the heat flux density of the slag is reduced by changing the chroma of the glass phase.