Abstract: Two kinds of A and B mould powder, A(/% ) ：28 -32SiO2,38 ~40CaO,4. 8-6. 0TC,2. 3 ~4. 3A12O3, 6.7~9. 7F； B(/% ) ：25. 2 ~26. 4SiO2,41 ~ 43CaO,4. 8 ~ 6. 0TC ,2. 3 ~ 4.3A12O3 10. 5 ~11. 8F for high strength peritectic steel S690 jumbo-wide slab are designed. After mould powders are used in situ, theirs heat transfer properties and films are analyzed. The results show that the properties of powder A with basicity 1. 25 ~ 1. 35, viscosity at 1 300 ℃ 0. 11 ~ 0. 16 Pa • s, solidification temperature 1 170 - 1 200 °C are optimum. As compared with powder B (basicity 1.58 ~ 1.64, 1 300 °C vicosity 0. 07 ~0. 10 Pa • s, solidification temperature 1 220 ~ 1 250 ℃ ), the cast slab crack rate decrease from 0. 69% to 0. 30%.

摘要： 设计了超宽板坯高强包晶钢S690的A、B两种保护渣,配方A（/%）:28～32SiO2,38～40CaO,4.8～6.0TC,2.3～4.3Al2O3,6.7～9.7F;B （/%）:25.2～26.4SiO2,41～43CaO,4.8～6.0TC,2.3～4.3Al2O3,10.5～11.8F。保护渣在生产现场试验后,对该保护渣的传热性能和渣膜进行了分析,结果表明,A保护渣性能最佳,其碱度1.25～1.35,粘度（1 300℃）0.11～0.16 Pa·s,凝固温度1170～1200℃;与B保护渣（碱度1.58～1.64,1 300℃粘度0.07～0.10 Pa·s,凝固温度1 220～1 250℃）相比,铸坯裂纹率从0.69%降至0.30%。

关键词: 超宽板坯, 高强包晶钢, 保护渣, 性能,