摘要
分别采用扫描电子显微镜和ANSYS软件研究了酸洗前钢板氧化铁皮的特征和拉矫机内吹扫流场的特征,以揭示吹扫流场对酸洗板表面凹坑形成的影响。结果表明:钢板上表面Fe_(3)O_(4)层平均厚度为5.18μm,下表面Fe_(3)O_(4)层平均厚度为6.45μm。吹扫梁上8个空气喷嘴的长度为6.7 cm时,各喷嘴喷出的气流相互干扰,钢板上出现2个氧化铁皮滞留区。吹扫梁上沿板宽分布的8个喷嘴的长度依次为6.7、8.7、10.7、12.7、11.7、10.7、8.7、6.7 cm时,各喷嘴喷出的气流相互干扰明显减轻,钢板上没有氧化铁皮滞留区。飘散在拉矫机内的氧化铁皮聚集在支撑辊之间的沟槽处,并在重力作用下落在钢板上,在工作辊的碾压下在钢板表面形成凹坑。
Characteristics of iron oxide scale on steel plate before pickling and the characteristics of blowing flow field in the tension leveler were investigated by means of scanning electron microscope and ANSYS software,respectively,to reveal the influence of the blowing flow field on the formation of pits on the pickled plate.The results showed that the average thickness of Fe_(3)O_(4) layer was 5.18μm on upper surface of the plate and 6.45μm on lower surface of the plate.When the length of eight air nozzles on the blowing beam was 6.7 cm,the airflow coming from each nozzle interfered each other,there were two iron oxide scale retention areas on the plate.When the length of eight nozzles distributed along the plate width on the blowing beam was in turn 6.7,8.7,10.7,12.7,11.7,10.7,8.7,and 6.7 cm,the mutual interference of airflow coming from each nozzle was reduced significantly,there was no iron oxide scale retention area on the plate.The scattered oxide scales in the tension leveler collected in the groove between the backup rolls,and dropped on the plate by the action of gravity,and,as a result,the pits formed on the steel plate due to rolling compaction of the work roll during tension straightening.
作者
李丹
张宦修
彭兴东
LI Dan;ZHANG Huanxiu;PENG Xingdong(Cold Rolled Strip Steel Plant,Shanghai Meishan Iron&Steel Co.,Ltd.,Nanjing Jiangsu 210039,China;School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan Liaoning 114051,China)
出处
《上海金属》
CAS
2023年第1期26-32,共7页
Shanghai Metals
关键词
热轧
酸洗板
凹坑
拉矫机
吹扫
hot rolling
pickled plate
pit
tension leveler
blowing
