Formation of Dense Inclusion Buildup on Submerged Entry Nozzle by Electric Current Pulse

doi:10.1007/s40195-016-0418-x

Abstract

Abstract:

In this work, low-density electric current pulse (ECP) has been applied to submerged entry nozzle (SEN) and its effect on the morphology of the inclusion buildup and the distribution of the inclusions in slab has been explored. The results reveal that under the unique effects of ECP, part of small inclusions less than 10 μm is expelled through the boundary layer along the current direction to form dense inclusion buildup. This method is of great potential to prolong the service life of SEN and improve the quality of the steel product.

Key words: Electric current pulse (ECP), Submerged entry nozzle (SEN), Densification, Transport

Wen-Bin Dai, Xiu-Li Zhou, Xin Yang, Guang-Peng Tang, Dan-Bin Jia, Nai-Liang Cheng, Jing-Kun Yu. Formation of Dense Inclusion Buildup on Submerged Entry Nozzle by Electric Current Pulse[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(5): 500-504.

Figures/Tables 6

Fig. 1 a Schematic diagram of ECP treatment; b photograph of the connection of SEN in experiment

Fig. 2 Distribution of the inclusions in the slabs with and without ECP treatment

Fig. 3 Average relative density and thickness of the inclusion buildups in the inner of the nozzles

Fig. 4 Microstructures of the inclusion buildups in the inner of the nozzle casting for 270 min without ECP treatment a-c and with ECP treatment d-f: a, d microstructures close to the nozzle wall; b, e microstructures close to the molten steel; c magnification of the area marked by the frame in b; f magnification of the area marked by the frame in e

Fig. 5 Schematic of inclusions movement close to the inner wall of SEN without a and with b ECP treatment

Fig. 6 EDS result of the point denoted by P in Fig. 4f

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