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通过对成品钢水N含量、是否采用倒角结晶器、连铸拉速以及吹氩量等参数与热轧卷表面卷渣、气泡及翘皮等表面缺陷的数据统计规律的研究,得出如下结论:当成品钢水N质量分数大于4×10~(-5)时,卷渣、翘皮及气泡发生率呈明显增加趋势;采用倒角结晶器后,前述缺陷的发生率为0.95%,低于未采用倒角结晶器时的1.39%;随吹氩量增加,前述缺陷发生率呈先增加后降低规律,当吹氩量在6.1~7.0 L/min范围时,缺陷发生率达最高值1.65%,在吹氩量大于9 L/min时,缺陷发生率迅速降至0.5%以下;随连铸拉速增加,卷渣、翘皮及气泡发生率总体呈增加趋势,拉速在1.0~1.1 m/min范围时,缺陷发生率最低,仅为0.62%,其次是拉速在1.25~1.3 m/min范围时,发生率为1.08%,拉速大于1.35 m/min时,发生率明显增加。
Through the statistical analysis of the N-content of the molten steel, whether the chamfering mold, continuous casting speed and the amount of argon blowing, and the statistical statistics of the surface defects such as entrainment, bubbles and skins on the HRC surface, the following conclusions are drawn : When the mass fraction of molten steel in the finished product is more than 4 × 10 ~ (-5), the incidence of entrainment, skimming and air bubbles increase obviously. The incidence of defects mentioned above is 0.95% 1.39% when the chamfering crystallizer was not used. With the increase of argon blowing, the above-mentioned defects firstly increased and then decreased, and when the argon blowing amount was in the range of 6.1-7.0 L / min, the defect rate reached 1.65% , The rate of defects rapidly decreased to less than 0.5% when the argon blowing amount was more than 9 L / min. With the increase of continuous casting speed, the incidence of entrainment, skimming and bubble generally increased. The pulling speed ranged from 1.0 to 1.1 m / min range, the lowest incidence of defects, only 0.62%, followed by the pull speed in the range of 1.25 ~ 1.3 m / min, the incidence rate of 1.08%, pull rate greater than 1.35 m / min, the incidence was significantly increased.