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发明公开
CN101875095A 用于低碳铝镇静钢的高粘度保护渣 无效 - 驳回

用于低碳铝镇静钢的高粘度保护渣
摘要：
本发明涉及用于低碳铝镇静钢的高粘度保护渣。其解决目前存在的保护渣的粘度较低，易进入钢液而造成轧后钢质缺陷等不足。措施：用于低碳铝镇静钢的高粘度保护渣，其特征在于：其保护渣的成分及重量百分比为：C：3.0～7.0％，CaO：25.0～35.0％，SiO2：33.0～45.0％，Al2O3：2.0～9.0％，F：3.0～7.5％，Na2O：5.0～12.0％，Li2O：≤5.0％；同时满足：CaO/SiO2＝0.7～0.98；所述保护渣的粘度η＝0.3～0.5Pa·S(1300℃)。本发明在提高了保护渣的粘度后，不仅流动性更加稳定、且不易被坯壳捕获，从而提高了低碳铝镇静钢表面质量，显著减少了钢的改判量。
摘要（英）：

The invention relates to a high-viscosity covering slag used for low-carbon aluminum-killed steel, which aims to overcome the shortages that the viscosity of the current covering slag is low and is easy to enter molten steel to cause steel quality defect and the like. A measure is that: the high-viscosity covering slag used for the low-carbon aluminum-killed steel is characterized by comprising the following components in percentage by weight: 3.0 to 7.0 percent of C, 25.0 to 35.0 percent of CaO, 33.0 to 45.0 percent of SiO2, 2.0 to 9.0 percent of Al2O3, 3.0 to 7.5 percent of F, 5.0 to 12.0 percent of Na2O and less than or equal to 5.0 percent of Li2O; meanwhile, CaO/SiO2 is of between 0.7 and 0.98; and the viscosity of the covering slag eta is of between 0.3 and 0.5 Pa.S (130 DEG C). After the viscosity of the covering slag is improved, not only the fluidity is more stable, but also the covering slag is not easy to be captured by a blank shell, so that the surface quality of the low-carbon aluminum-killed steel is improved and the commuted amount of steel is reduced remarkably.

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