论文部分内容阅读
通过铸坯取样分析研究了板坯结晶器内拉速和电磁制动与小气泡分布之间的关系,探讨了拉速以及电磁制动对IF钢铸坯皮下气泡大小、数量和分布的影响规律.实验结果表明:铸坯皮下气泡直径小于0.1 mm的气泡占总数的57%,0.1~0.5 mm之间的占42.5%,大于0.5 mm占0.5%,并且随着皮下距离的增加,被捕捉的气泡尺寸越来越小,而气泡数量边部比1/4处要多50%左右,1/4位置最少;拉速提高会导致气泡尺寸变小,在1/4及边部,气泡聚集位置由皮下9 mm变为12 mm附近,但是低拉速和高拉速均在皮下3 mm位置处有气泡聚集;电磁制动下,铸坯中心处气泡尺寸变大,1/4及边部位置气泡尺寸变小,且会使气泡数量总体降低,主要表现在聚集位置处的气泡数量明显减少.
The relationship between casting speed and electromagnetic brake and the distribution of small bubbles in slab mold was studied by slab sampling analysis. The effects of drawing speed and electromagnetic brake on the size, amount and distribution of air bubbles in IF steel slab were discussed. The experimental results show that the bubbles with the diameter of less than 0.1 mm in the skin of the cast slab account for 57% of the total number of bubbles, 42.5% of which are between 0.1 and 0.5 mm and 0.5% of which are larger than 0.5 mm, and are captured as the subcutaneous distance increases The bubble size is getting smaller and smaller, while the number of bubbles is about 50% more than the 1/4, and the least one-fourth is the least. The pulling speed is increased and the bubble size becomes smaller. At the 1/4 and the edge, From 9 mm in the subcutaneous to 12 mm in the vicinity, but the bubble velocity was high at the position of 3 mm below the subcutaneous and the air bubbles were aggregated at the position of 3 mm under the skin. Under the electromagnetic braking, the bubble size became larger at the center of the slab, The size of the bubble becomes smaller, and the overall number of bubbles will decrease, which is mainly manifested in the obvious decrease in the number of bubbles at the aggregation location.