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通过示踪追踪等方法,系统分析了北方某钢厂采用160吨BOF→Ar Blowing→CC生产工艺生产的Q195钢中氧、氮和非金属夹杂物类型、尺寸、数量、分布、变化历程的变化。结果表明,铸坯平均T[O]为118×10~(-5),[N]为35×10~(-5),显微夹杂平均含量为18.49个/mm~2,以CaO-SiO_2-Al_2O_3-MnO-TiO_2为复合夹杂为主,尺寸在2.5~10.0μm之间;所有夹杂物中含钢包渣污染物的约占41%,含中间包渣污染物的约占33%,含结晶器保护渣污染物的约占18%。钢包顶渣、中间包渣吸附夹杂能力不够,出钢过程中应加钙铝酸盐基渣洗料对钢包顶渣改质,增强其吸附夹杂物的能力,并将脱氧合金化后的2 min氩气大吹去掉,避免钢液面裸露,同时将8 min的静吹时间延长为10~12 min,促进夹杂物的上浮。
By means of tracer tracking and other methods, the types, sizes, quantities, distributions and changes of oxygen, nitrogen and nonmetallic inclusions in Q195 steel produced by a steel plant in North China with 160 tons of BOF → Ar Blowing → CC production process were systematically analyzed. . The results show that the average T [O] is 118 × 10 ~ (-5), [N] is 35 × 10 ~ (-5) and the average content of microinclusions is 18.49 / mm ~ -Al_2O_3-MnO-TiO_2 is mainly composed of composite inclusions with the size of 2.5 ~ 10.0μm. The inclusions account for 41% of all the ladle slag contaminants and 33% Mold flux residue accounted for about 18%. Ladle top slag, tundish slag inclusion capacity is not enough, during the tapping process should be added calcium aluminate slag-based slag ladle top slag modification to enhance its ability to adsorb inclusions, and deoxidization alloy after 2 min Argon blowing away, to avoid the bare steel surface, while the static blowing time of 8 min extended to 10 ~ 12 min, to promote inclusion floating.