通过对连铸坯和热轧板表面气孔缺陷影响因素的分析,确定了由上水口、氩封和浸入式水口3个位置吹入的氩气不能有效上浮而被凝固坯壳捕捉形成了连铸坯表面气孔缺陷.气孔基本分布在宽面靠近窄边位置,而连铸坯宽面中心和连铸坯宽面1/4位置气孔数量很少.采用不吹氩气的生产工艺可以消除连铸坯和热轧板表面的气孔缺陷.
Influencing factor of the blow hole defect in continuous casting slab and hot rolled plate were analyzed. The main reason of surface blow hole defect in continuous casting slab is that the argon gas insufflate the mold from the upper nozzle, argon sealing and submerged entry nozzle cannot float effectively. The argon blow hole was cap-tured by solidified continuous casting slab shell and induced the surface blow hole defect in continuous casting slab. The blow hole mostly distributed to the wide-face shell edge near the narrow side position. The quantity of blow hole in the center of wide-face and the 1/4 of wide-face shell is few. The surface blow hole defect in continuous cast-ing slab and hot rolled plate can be eliminated by utilizing no argon blowing.
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