含铝冷镦钢连铸塞棒结瘤分析和预防工艺措施

Analysis on Stopper Clogging Mechanism and Preventive Measures for Continuous Casting Aluminum Bearing Cold Heading Steel

通过对连铸0.03%～0.06%Al冷镦钢中间包浸入式水口、塞棒耐火材料和结瘤物的检测和结瘤形成机理的分析,提出防止塞棒结瘤的工艺措施:采用出钢流加高铝锰铁合金和钢包吹氩喂铝线;中间包用挡墙和高液位操作以促进Al_2O_3上浮;全程保护浇铸;控制精炼后T[O]≤15×10^(-6);降低塞棒头部SiO_2含量,提高ZrO_2含量。通过改进工艺操作,连铸塞棒水口结瘤明显减少,平均连浇炉数≥12炉。

The process measures to prevent stopper clogging have been presented by measuring materials of stopper and tundish submerged entry nozzle and clogging for casting 0. 03% -0. 06% A1 cold heading steel and analysis on formation mechanism of clogging. The measures are to adopted adding high AlMnFe alloy in tapping flow and feeding Al wire with argon blowing; tundish with dam and high liquid lever operation to promote Al2O3 floating; whole process protective casting; controlling T[ O]≤15 × 10^-6 after refining; decreasing SiO2 content in head of stopper and increasing ZrO2 content. The casting stopper nozzle clogging obviously decreased by using improved process operation, the average continuous casting heats were ≥12 heats.