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分析了莱钢股份公司特钢厂20号管坯钢铸坯表面凹陷的产生原因,制定了相应的控制措施,使20号钢连铸坯表面凹陷得到了有效控制。
The reason of the surface depression of No. 20 blank steel slab in Laiwu Steel Co., Ltd. was analyzed and the corresponding control measures were worked out so that the surface sag of No. 20 steel slab was effectively controlled.