摘要
冷轧带钢退火时表面会形成颗粒状氧化物,出退火炉后从130~250℃冷却至约40℃以下的过程中,氧化物会剥落而污染水冷槽,并造成带钢表面产生“小黑点”等缺陷。采用SEM、TEM和XRD研究了带钢表面氧化物的形貌、尺寸及成分。结果发现:氧化物主要为尺寸100 nm左右的MnOOH和Mn3O4,两种氧化物可相互转化,即MnOOH加热脱水时能重新形成Mn3O4。带钢水冷时,氧化物从其表面剥落后在水中会继续聚集形成大尺寸的团聚体。采用激光粒度仪对静置冷却水进行了4周的观察,结果表明:冷却水中氧化物团聚体的等效粒径从3μm增大至95.6μm。团聚体经超声波振动后被明显分散,这表明氧化物的团聚为普通的物理结合。
Granular oxides will form on the cold-rolled steel strip during its being annealed,and the oxides will spall off from the strip coming out of the annealing furnace during cooling from 130-250℃to at least 40℃,thus causing the water-cooling bath to be polluted and defect such as“black spot”to develop on the strip surface.The oxides were tested for form,size and composition by SEM,XRD and TEM.From the tested results it was discovered that the oxides predominantly were MnOOH and Mn3O4,which can convert each other,i.e.,the MnOOH can change into the Mn3O4 when heated to the extent that it is dehydrated.The oxides peeling off from the strip would become the large-sized agglomerates during water-cooling.The still cooling water was observed for four weeks with a laser granulometer.The results showed that the equivalent diameter of the oxide agglomerates increased from 3μm to 95.6μm.The agglomerates could be dispersed by ultrasonic vibration,which indicate that the aggolmeration of oxides is a physical combination.
作者
周锦程
江晓亮
胥俊
陈卓
汪宏斌
ZHOU Jincheng;JIANG Xiaoliang;XU Jun;CHEN Zhuo;WANG Hongbin(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)
出处
《上海金属》
CAS
北大核心
2020年第1期7-12,共6页
Shanghai Metals
关键词
纳米氧化物
水冷槽
团聚
缓慢氧化
nano-scale oxide
water-cooling bath
agglomerate
slow oxidation
