The Study of Edge Crack on Hot Strip Steel for CSP
By macroscopic observation, metallographic examination, scanning electron microscope and energy spectrum analysis, it is inferred that the steel flow bellows SEN is too strong that the heat delivering at steel top surface in the mould is not enough by taking sample on slab, F2 transition strip and hot strip steel with cracks, which causes insufficient mould powder melting, and hooked oscillation marks are formed. Since liquid steel liquidity is not good either, a part of powder can be caught by solidification front, and many fine cracks are generated on slab surface. This kind of hooked oscillation mark, subsurface fine crack and corner crack evolve into edge crack, and rolling simulation testing proved this inference. Moreover, Cu beneficiation is also one reason of edge crack. Edge crack of hot strip steel study can be used to guide actual production, and to avoid the generation of edge crack.
Jimmy (C.M.) Kao, Wen-Pei Sung and Ran Chen
Q. C. Peng et al., "The Study of Edge Crack on Hot Strip Steel for CSP", Advanced Materials Research, Vols. 581-582, pp. 533-539, 2012