Study of the Effect of Mold Corner Shape on the Initial Solidification Behavior of Molten Steel Using Mold Simulator

Prediction Model for Degree of Solid-shell Unevenness during Initial Solidification in the Mold

“…Sang-Hum KWON, 1,2) Young-Mok WON, 2) Gu Seul BACK, 1) Hyeju KIM, 1) Jae Sang LEE, 1) Dong-Gyu KIM, 3) Yoon Uk HEO 1) and Chang Hee YIM 1) * The unevenness of the solid-shell and heat flux (Φ q ) during solidification were measured for various steel grades with casting apparatus. Then the data were used to develop a model to predict the degree of solid-shell unevenness according to the steel composition.…”

“…In addition, if the solid-shell is uneven, heat transfer is disturbed by air gaps that form between the solid-shell and the mold wall; this disturbance extends the time for which the initial solid-shell is exposed to high temperature, and thereby promotes coarsening of grains on the surface of the cast steel. [2][3][4][5][6][7][8] These coarse grains cause concentration of segregation and stress at grain boundaries, so surface cracking is facilitated. [9][10][11][12] During continuous casting, peritectic steels in which the solid-shell is unevenly solidified also have relatively large mold level fluctuations, which degrade the surface quality of the cast steel.…”

A 3D Mathematical Modeling on Meniscus Solidification and Heat Transfer in Continuous Casting Chamfered Mold of Slab

“…The 3D model of the right‐angle mold [ 25 ] was established, and it was found that the thickness of the slag film at the corner was large, and the horizontal heat flux at the meniscus from the liquid steel to the wide face or narrow face of the mold at the corner was lower than that far from the corner, respectively, but the total heat flux at the corner through the 2D cooling of the wide face and narrow face was obviously large. In addition, mold simulator was also set up to investigate the behavior of initial solidification at the corner of the right‐angle mold [ 13 ] and the chamfered mold, [ 24 ] and the temperature of the mold and oscillation marks near the corner and mold face was compared, respectively, but the influence of the fluid flow on the meniscus behavior was neglected. Some other mathematical models [ 14,15 ] were conducted to compare the temperature of the steel and solidified shell at the corner with different mold chamfers, but the influence of the slag film on the heat transfer from the steel to the mold was simplified.…”

“…These years, many studies [5,[16][17][18][19][20][21][22][23] about the solidification of the curved meniscus have been conducted, but mainly focused on the 2D meniscus behavior near the wide face or narrow face of the mold through the plant trial, mold simulator, and mathematical simulation. In addition, some other studies [9,13,24,25] were also conducted to investigate the meniscus behavior at the corner of the mold. It was proposed that the meniscus shape was related to the interfacial tension of the steel-slag (or the surface tension of the steel touching the gas) and other body force, such as the gravity and electromagnetic force.…”

Formation of Deposited Oxide Film during the Sub-rapid Solidification of Silicon Steel Droplet and Its Effect on Interfacial Heat Transfer Behavior

“…The interfacial heat transfer between the melt and roller is one of the most important issues during the initial solidification of molten steel in strip caster, which has a great effect on the surface and internal quality of the steel strips. [18,25,26] In addition, the interfacial heat transfer also determines the productivity of the strip caster. [27][28][29][30] Therefore, it is of great importance to understand the interfacial heat transfer during the strip-casting process.…”