Abstract: Main ingredients of test mould powder were ( % ) 35. 46CaO, 32. 84SiO₂, 7. 87Al₂O₃ ,3. 04MnO ,8. 48Na₂,O, 7. 13F, 2. 6C. Samples of mould molten slag and slag film during casting of stainless steel !Crl7 were taken to study the change of ingredients and properties of molten slag and performance of slag film. Results showed that at casting for less than 10 min, the Al₂O₃ and Cr₂O₃ content in molten slag definitely increased while basicity of molten slag slightly decreased ,but for more than 10 min the contents were trending towards stability: as compared to fresh slag the melting temperature and viscosity of molten slag increased of which the change of solidification temperature was minor； the melting temperature of molten slag after change ingredient was still in suitable range, although the viscosity of molten slag increased by 0. 08 Pa , s； the slag film consisted of crystal layer and glassy layer, the crystallization ratio of slag film was about 71% and the main phases of film were cuspidite crystals with minor nepheline crystals.

摘要： 在板坯连铸过程中取不锈钢1Cr17保护渣的液渣和渣膜试样,研究液渣成分和性能的变化,以及渣膜的性质。保护渣的主要成分(%)为:35.46CaO、32.84SiO₂、7.87Al₂O₃、3.04MnO、8.48Na₂O、7.13F、2.6C。结果表明,开浇后液渣中Al₂O₃、Cr₂O₃含量有一定增加,碱度稍有降低,但10 min后趋于稳定;液渣熔化温度和粘度相对于原始渣均有不同程度增加,凝固温度变化较小;保护渣变化后的熔化温度仍处于合理范围内,粘度值最多增加了0.08 Pa·s;保护渣渣膜由结晶层和玻璃层组成,渣膜结晶率约为71%,结晶矿相主要是枪晶石和少量霞石。