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| The formation mechanism of the clogging of submerged entry nozzle of Ti-bearing ultra pure ferrite stainless steel |
| Xingrun Chen2 |
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Abstract In response to the problem about the clogging of submerged entry nozzle of Ti-bearing ultra pure ferrite stainless steel, the clogging of 0.17%Ti stainless steel and 0.39%Ti stainless steel were taken to investigate the formation mechanism of the clogging of submerged entry nozzle. The chararcteristics of the clogging were analyzed by scanning electron microscopy. There were main aluminum inclusions in the frozen steel close to the surface of refractory in 0.17%Ti stainless steel. What is more, the clogging was consisted of a lot of Al2O3-MgO inclusions with a few CaO-TiO2 inclusions. The clogging of 0.39%Ti stainless steel was main Al2O3-MgO-CaO-TiO2, which contained a lot of dendritic CaO-TiO2 inclusions. Incluions containing titanium oxide were easy to form in stainless steel with high titanium content. The decrease of tempeture would promote the formation of perovskite inclusions during continuous casting of stinless steel with high titanium content.
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Received: 25 April 2018
Published: 17 April 2020
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2019, Vol. 38 