Research on cleanliness in unsteady casting slabs of IF steel

LI Yu-di, JANG Zhong-kuai

Continuous Casting ›› 2022, Vol. 41 ›› Issue (2) : 89-94.

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Continuous Casting ›› 2022, Vol. 41 ›› Issue (2) : 89-94. DOI: 10.13228/j.boyuan.issn1005-4006.20220005
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Research on cleanliness in unsteady casting slabs of IF steel

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Abstract

In order to study the effect of unsteady casting on the cleanliness of IF steel slabs, the steady-state and unsteady-state casting of IF steel slabs produced by BOF-RH-CC process were compared by means of oxygen-nitrogen analysis, Aspex Explorer SEM and SLIME. The results show that the steady-state casting slab has higher cleanliness, the average w(T[O]) and w(N) is 14.5×10-6and 9.5×10-6, the average quantity density of micro-inclusions are 5.1/mm2, and the mass of large inclusions are 3.34 mg/10 kg. In the non-steady state process, the cleanliness of the head slab is the worst, followed by the tail slab and the nozzle slab. The micro-inclusionsin different types of slabs are the same, but the unsteady-state slabs have more large inclusions due to mold flux entrapment than the normal slab.

Key words

IF steel / unsteady continuous casting / inclusion / cleanliness / continuous casting / oxygen and nitrogen content

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LI Yu-di, JANG Zhong-kuai. Research on cleanliness in unsteady casting slabs of IF steel[J]. Continuous Casting, 2022, 41(2): 89-94 https://doi.org/10.13228/j.boyuan.issn1005-4006.20220005

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