By means of the numerical simulation method,the mathematical model of inclusions movement in the mold is established under the condition of austenitic and fen-itic stainless steel slab production. According to the sim...By means of the numerical simulation method,the mathematical model of inclusions movement in the mold is established under the condition of austenitic and fen-itic stainless steel slab production. According to the simulation results, the main zones for inclusion particles accumulation were found and many factors that affected floating-up probability of inclusion particles were identified. These factors include the inclusion particle size, the casting speed and the slab width, etc. It is believed that the inclusion particle size is the key one among these factors.展开更多
In order to analyze the effect of electromagnetic stirring on the slab＇ s surface purity, the continuously cast slab surface inclusions and subsurface blisters have been investigated. The results indicate that the mo...In order to analyze the effect of electromagnetic stirring on the slab＇ s surface purity, the continuously cast slab surface inclusions and subsurface blisters have been investigated. The results indicate that the mold electromagnetic stirrer （M -EMS） is useful for the improvement of IF steel slabs＇ surface quality. The continuously cast slab surface inclusions and subsurface blisters have been significantly reduced. The distribution of bubbles in the slab is non-homogeneous in terms of both width and depth. The continuously cast slab surface inclusions tend to miniaturization through M-EMS and most of the inclusions are less than 10 μm in size.展开更多
In the current study, the transformation in the composition of non-metallic inclusions from the molten steel to the solidified steel was studied and the composition distribution of inclusions on the cross section of a...In the current study, the transformation in the composition of non-metallic inclusions from the molten steel to the solidified steel was studied and the composition distribution of inclusions on the cross section of a linepine continuous casting slab was predicted. During cooling and solidification of the continuous casting strand, Al_(2)O_(3)-CaO inclusions reacted with the bulk steel and transformed to CaS-Al_(2)O_(3)-MgO-(CaO) ones in the continuous casting slab. The composition of inclusions on the cross section of the slab varied with locations due to the varied cooling rate. A model was established to predict the distribution of the composition of inclusions on the cross section of the continuous casting slab, coupling solidification and heat transfer of the continuous casting slab, the kinetic mass transfer of the dissolved elements in the solid steel, and thermodynamic calculation of inclusion transformation at different temperatures. The composition transformation of inclusions mainly occurred at the temperature between the liquidus and solidus of the linepipe steel. Inclusions were mainly CaS-Al_(2)O_(3)-MgO-(CaO) in slab center and were MgO-Al_(2)O_(3)-CaO-CaS within the subsurface of the slab. In the slab, the transformation fraction of inclusions was less than 10 % at corners while it reached 70 % at 50 mm below the surface of the slab.展开更多
文摘By means of the numerical simulation method,the mathematical model of inclusions movement in the mold is established under the condition of austenitic and fen-itic stainless steel slab production. According to the simulation results, the main zones for inclusion particles accumulation were found and many factors that affected floating-up probability of inclusion particles were identified. These factors include the inclusion particle size, the casting speed and the slab width, etc. It is believed that the inclusion particle size is the key one among these factors.
文摘In order to analyze the effect of electromagnetic stirring on the slab＇ s surface purity, the continuously cast slab surface inclusions and subsurface blisters have been investigated. The results indicate that the mold electromagnetic stirrer （M -EMS） is useful for the improvement of IF steel slabs＇ surface quality. The continuously cast slab surface inclusions and subsurface blisters have been significantly reduced. The distribution of bubbles in the slab is non-homogeneous in terms of both width and depth. The continuously cast slab surface inclusions tend to miniaturization through M-EMS and most of the inclusions are less than 10 μm in size.
基金supported financially by the National Science Foundation China(Nos.U1860206 and 51725402)the Fundamental Research Funds for the Central Universities(Nos.FRF-TP-17-001C2 and FRF-TP-19-037A2Z)+1 种基金the High Steel Center(HSC)at Yanshan UniversityBeijing International Center of Advanced and Intelligent Manufacturing of High Quality Steel Materials(ICSM)and the High Quality Steel Consortium(HQSC)at University of Science and Technology Beijing(USTB),China。
文摘In the current study, the transformation in the composition of non-metallic inclusions from the molten steel to the solidified steel was studied and the composition distribution of inclusions on the cross section of a linepine continuous casting slab was predicted. During cooling and solidification of the continuous casting strand, Al_(2)O_(3)-CaO inclusions reacted with the bulk steel and transformed to CaS-Al_(2)O_(3)-MgO-(CaO) ones in the continuous casting slab. The composition of inclusions on the cross section of the slab varied with locations due to the varied cooling rate. A model was established to predict the distribution of the composition of inclusions on the cross section of the continuous casting slab, coupling solidification and heat transfer of the continuous casting slab, the kinetic mass transfer of the dissolved elements in the solid steel, and thermodynamic calculation of inclusion transformation at different temperatures. The composition transformation of inclusions mainly occurred at the temperature between the liquidus and solidus of the linepipe steel. Inclusions were mainly CaS-Al_(2)O_(3)-MgO-(CaO) in slab center and were MgO-Al_(2)O_(3)-CaO-CaS within the subsurface of the slab. In the slab, the transformation fraction of inclusions was less than 10 % at corners while it reached 70 % at 50 mm below the surface of the slab.
