Three-dimensional distribution on macro inclusions in surface layer of IF steel slabs
DENG Xiao-xuan1,2, LI Hai-bo1,2, JI Chen-xi1,2, CHEN Bin1,2, ZHU Guo-sen1,2
1. Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China; 2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing 100043, China
Abstract:The distributions of macro-inclusions plays an significant role in surface quality of cold rolled steel sheets. The three-dimensional distribution of inclusions over 100 μm in 20 mm surface of IF steel slab was studied by ASPEX automatic detection method and layer-by-layer planing method.It is found that three kinds of macro inclusions were detected, bubbles, alumina plus bubbles and brick alumina and their number percentage occupy 72%、26% and 2%,respectively. The large sized macro inclusions mainly concentrated within the upper roll center zone and stagnant zone below the submerged entry nozzle (SEN) bottom according to the full scale water modeling of mold domain. Eliminating the dead zone in mold is helpful to reduce the large size inclusions and improve the surface quality of rolled products.
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