Q195连铸板坯生产过程中显微夹杂物行为
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摘要
我国北方某厂,为降低生产成本,Q195钢种采用简易的生产工艺,生产流程:150 t转炉→吹氩→CC,其主要产品为带钢,用于制备冷、热轧薄板。系统分析了该厂连铸坯,平均T[O]为120×10~(-5),[N]为18×10~(-5),单位面积上夹杂物个数为13个/mm~2,混浇坯平均T[O]为180×10~(-5),[N]为21×10~(-5)。铸坯中主要有两类显微夹杂物,一类为SiO_2-Al_2O_3-MnO-CaO-TiO_2夹杂,粒度约为10μm,另一类为Al、C类夹杂,粒度约为25μm。为此,对脱氧、脱氧剂的选择、钢包顶渣、非稳态浇注进行了优化,稳态铸坯平均T[O]降为90×10~(-5),夹杂物粒度85%小于5μm,与原工艺转炉→吹氩→LF→CC产品质量相当。
In a factory in north China, using the simple production process which is 150 t converter→argon blowing→CC to product Q195 steel to reduce production cost, its main products are strip steels for hot-rolled and cold-rolled sheet. The continuous casting billet of the factory was analyzed systematically. The results show that the average of T [O] in steady billet is 120×10~(-5), [N] is 18×10~(-5), the number of inclusions per unit area is 13, the average of T [O] of unsteady billet is 180×10~(-5), and the [N] is 21×10~(-5). There are two kinds of micro inclusions in the casting billet, one kind is SiO_2-Al_2O_3-MnO-CaO-TiO_2 inclusion, the particle size is about 10 μm, the other is Al, C inclusion, the particle size is about 25 μm.Therefore, the choice of deoxidation and deoxidizer, ladle top slag, unsteady state casting were optimized. The average of T[O] in steady billet reduces to 90×10~(-5), the particle size of 85% inclusions less than 5 μm, the quality of the products is the same as the original process of converter→argon blowing→LF→CC.
In a factory in north China, using the simple production process which is 150 t converter→argon blowing→CC to product Q195 steel to reduce production cost, its main products are strip steels for hot-rolled and cold-rolled sheet. The continuous casting billet of the factory was analyzed systematically. The results show that the average of T [O] in steady billet is 120×10~(-5), [N] is 18×10~(-5), the number of inclusions per unit area is 13, the average of T [O] of unsteady billet is 180×10~(-5), and the [N] is 21×10~(-5). There are two kinds of micro inclusions in the casting billet, one kind is SiO_2-Al_2O_3-MnO-CaO-TiO_2 inclusion, the particle size is about 10 μm, the other is Al, C inclusion, the particle size is about 25 μm.Therefore, the choice of deoxidation and deoxidizer, ladle top slag, unsteady state casting were optimized. The average of T[O] in steady billet reduces to 90×10~(-5), the particle size of 85% inclusions less than 5 μm, the quality of the products is the same as the original process of converter→argon blowing→LF→CC.
引文
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