Study on clogging of submerged entry nozzle of 321 stainless steel

ZHENG Jian-chao; PAN Chao; CUI Chong-wei; LIN Ping; HU Xiao-jun

doi:10.13374/j.issn2095-9389.2018.s1.012

Volume 40 Issue S1

Dec. 2018

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ZHENG Jian-chao, PAN Chao, CUI Chong-wei, LIN Ping, HU Xiao-jun. Study on clogging of submerged entry nozzle of 321 stainless steel[J]. Chinese Journal of Engineering, 2018, 40(S1): 77-84. doi: 10.13374/j.issn2095-9389.2018.s1.012

Citation:

ZHENG Jian-chao, PAN Chao, CUI Chong-wei, LIN Ping, HU Xiao-jun. Study on clogging of submerged entry nozzle of 321 stainless steel[J]. Chinese Journal of Engineering, 2018, 40(S1): 77-84. doi: 10.13374/j.issn2095-9389.2018.s1.012

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Study on clogging of submerged entry nozzle of 321 stainless steel

doi: 10.13374/j.issn2095-9389.2018.s1.012

1. State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing;
2. Ruipu Technology Group Co.Ltd.

Received Date: 2018-01-23
Available Online: 2023-07-18

Abstract

Abstract

The 06Cr18Ni11Ti (321) stainless steel has good corrosion resistance and mechanical properties.However, the addition of Ti leads to the formation of Ti N inclusions, which deteriorates the condition of continuous casting and causes the clogging.The formation of clogging in the submerged entry nozzle (SEN) of 321 stainless steel was studied by scanning electron microscopy (SEM) , energy disperse spectroscope (EDS) and thermodynamic calculation.According to the change of components, three layers in sample were defined:the refractory materials layer, the reaction layer and metal layer from the outer layer to the inner layer of SEN.The results show that the molten steel corrodes the refractory materials of SEN and the high-melting-point slag phase forms.Then Ti N inclusions attach to the inner layer and form curved chain or reticular structure with slag phase, which causes the clogging of SEN.Resultsof thermodynamic calculation indicate that the equilibrium solubility of titanium and nitrogen increases with temperature.There is high Ca/Al proportion in Ca O-Al₂O₃-Ti O₂-5%MgO phase.So controlling the compositions of slag is needed to prevent clogging.
- stainless steel,
- submerged entry nozzle,
- clogging,
- equilibrium solubility,
- c alcium treatment

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References(16)

References

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