Influence of Steel Strip-Feeding Process on Density and Segregation of Casting Ingot

Abstract

The effect of steel strip-feeding ratio and superheat degree of molten steel on density and segregation of casting ingot is investigated by an original position analysis. It indicates that under the same degree of superheat condition, with the increase of feeding ratio, the average density of the casting ingot increases and the central segregation of the ingot decreases. Under the same feeding ratio conditions, the density and the central segregation increase with the increase of the degree of superheat.

Feeding Steel Strip Technology in Continuous Casting Process: A Review

“…Zhao et al [26,27] also observed a similar increasing trend, as shown in Table 3. For large R (0.76% feeding ratio with a 50 K superheat), the equiaxed zone ratio doubled and the grain size was half of the original structure.…”

“…Pilot production [16,18] and as-cast feeding experiment [25][26][27] have already indicated that a complete melting strip (which means D s is more shallow than the liquid core depth) and an appropriate R are necessary for a satisfying slab structure. Meanwhile, Equation (4), (10), and (14) shows that many parameters affect two or three of t m , D s , and R simultaneously, including physical parameters of liquid steel and steel strip, v f , d 0 , and ΔT.…”

“…As a pioneer work of industrial production, scholars carried out laboratory-scale feeding strip experiments to study the effect of R on the quality of ingot by scholars. [25][26][27] The strip was fed into the mold filled with molten steel. Table 3 shows experiment parameters and ingots quality inspection results with different R by different researchers.…”

“…Therefore, parameters affecting the strip melting behavior and R became the research emphasis. [25][26][27] Due to the opacity of the continuous casting process, the effect of these parameters was not thoroughly investigated at an early stage. Until recent years, numerical simulation studied multiple physical fields and strip melting process in the feeding strip process.…”

The Investigation of Phase Transition and Solute Transport for Bloom Continuous Casting with Steel Strip‐Feeding Process and Mold Electromagnetic Stirring: A Comparative Study

“…Zhao et al [ 23 ] studied the effects of the steel strip feeding ratio and the molten steel superheat on the solidification structure and found that increasing the feeding ratio and reducing the superheat can increase the equiaxed crystal ratio and reduce the macrosegregation and porosity, which can be confirmed by using the original position analysis (OPA). [ 24 ] For the research on numerical simulation, Shen et al [ 25 ] studied the influence of steel strip feeding on the superheat degree and equiaxed grain rate by 2D slice method, and found that the superheat decreases more obviously with the increase of feeding speed, and the equiaxed grain rate also increases. However, the feeding speed should not be too fast; otherwise, it will lead to incomplete melting of the feeding strip, which is consistent with the experimental results of Isaev et al [ 21 ] Niu et al [ 26,27 ] established a mathematical model for feeding steel strips in 3D space, and studied the flow field distribution and phase transition in the mold under different feeding strip processes.…”