An Experimental Investigation of Continuous Casting Process: Effect of Pouring Temperatures on the Macrosegregation and Macrostructure in Steel Slab

Abstract

The solidification control is of extreme importance, because it strongly affects the final casting quality sanity. The structure obtained is generally not homogeneous and gives rise to great variations in composition, with position at small and large scales, which is known as segregation. An understanding of the way segregation occurs in continuous casting is of great importance for steels and in designing post-casting processes. As-cast structures are responsible the reduction in both scale and extension of segregation, because mass transport is dependent on the time required to diffuse a solute over a characteristic distance, e.g., the dendrite spacing that the characterizes the solidification structure. In this work, the effect of pouring temperature in steel slabs on the continuous casting processes are systematically investigated. Relationships between pouring temperature (P T) and center macrosegregation was qualitatively examined. Photomicrographs of specimen taken from transverse sections of steel slabs, shows that macrosegregation is strongly affected by pouring temperature (P T). For solute of carbon, phosphorus and sulfur, has been shown that the pouring temperature (P T) has a significant role on the resulting macrosegregation profiles, while that the elements as such silicon, manganese and aluminum, the said thermal parameter seems not able to affect its macrosegregation profiles. This is due to the fact that the solutes with lower partition coefficients favors segregation during the continuous casting process. It is shown for considered steels, the pouring temperature (P T) influences the position of the columnar to equiaxed transition (CET). Experimental results show that the end of the columnar region is abbreviated when lower pouring temperatures is used in continuous casting process. One can observe that as the pouring temperature (P T) increase in continuous casting process, the secondary dendritic arm spacing (λ 2) increase, i.e., the dendritic morphology became coarsen.

Investigation on impact and DWTT resistance at low temperatures in Nb and Ti micro alloy steels

“…In addition, the segregation band becomes clearer and thicker Figure 5(c). Within the scope of this information, it can be interpreted that the speed and temperatures are selected at the optimum level from the time of casting [22]. When the test process parameters were examined, it is observed that by performing thermomechanical rolling, it had the highest holding time (100 sec) (trial slab Number 2) different from other trials and consequently the coil had the lowest temperature at the strip mill entrance.…”

On the Macrosegregation of Continuous Casting of High Carbon Steel Billet with Strand Reduction Process

“…Numerous experimental research works were conducted to study the effects of continuous casting conditions on macrosegregation [4,5], and several numerical simulations were also carried out to have an in-depth understanding or description of macrosegregtion during continuous casting. Oh…”

Investigation of Solidification Heat Transfer in Slab Continuous Casting Process Based on Different Roll Contact Calculation Methods

“…In the continuous casting process, the heat of the liquid steel is sequentially removed in the mold, the secondary cooling region, and the air cooling region, which is closely related to the quality and productivity of the casting steel [ 1 , 2 , 3 ]. Many researchers [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ] have studied the heat transfer behavior of casting steel using numerical calculation methods in order to optimize the cooling and other process parameters.…”