Optimisation of narrow face water slot design for Siderar slab casting mould

Abstract

investigations carried out included the study of a used plate and an analysis of the continuous casting mould narrow A study of a mould narrow plate was carried out at plate by means of a nite element model (Fig. 1). The purpose Instituto Argentino de Siderurgia (IAS), to assess of the work was to study whether too high a temperature the plate condition after its life, in this case 2227 in the narrow plate could be generating a distortion of the heats. A finite element model of steady heat mould corner below the meniscus, and, if so, to evaluate conduction in the mould narrow face was an alternative design for the narrow plate. The result is a developed, using ANSYS software, with eight node tool capable of predicting the temperatures of the hot face rectangular elements. Attention was focused on of the plate. the hot face temperature distribution, including the corner temperature and the difference between the maximum and minimum temperatures across STUDY OF USED PLATE the hot face. Temperature distribution in the narrowThe plate ( Fig. 2) was of dimensions 200× 900×45 mm, face of the Siderar slab casting mould was with a nickel coating of depth 3 mm all over the surface calculated, and alternatives to optimise the water and 1 mm at the edges, and the (copper) plate material was slot design by altering the geometry to minimise Se-Cu-Ag (0·08-0·13%Ag). The mould of the caster is both corner temperature and temperature variation curved. across the hot face were analysed. According to theThe plate was cut into several pieces, and hardness results, the existing narrow face design does not measurements and other studies were carried out. Figure 3 produce excessive temperatures anywhere in the shows the longitudinal hardness pro le, and Fig. 4 shows mould. However, a gradient exists across the hot the hardness of a section of the plate in the meniscus area. face. In addition, an accurate equation was In Fig. 4 is possible to see that the hardness of the copper developed to predict corner temperature as a was lower near the hot face than in the rest of the plate, function of hot face heat flux and water slot where it remained almost constant. geometry. Several other water slot geometry redesigns were investigated, which further FINITE ELEMENT MODEL improved potential hot face temperature uniformity at the expense of increasing complexity of the Eight diVerent cases were modelled using ANSYS software,2 water slot design. The predictions of the model are including the original mould design ( both opposite from a in agreement with observations made in a previous bolthole and between boltholes) and six redesigns, based post-mortem study carried out at IAS on a narrow on variations from the original by changing the water slots. plate. I&S/1664As the meniscus level remains below the end of the water slot curvature, 100 mm below the mould top, the curvature Professor Thomas and Ms Langeneckert are at the University of at the top of the slot need not be modelled, so only twoIllinois at Urbana-Champaign, Dept. of Mechanical Eng...

Thermal Behavior of Hot Copper Plates for Slab Continuous Casting Mold with High Casting Speed

“…Chow et al 1) applied a mathematical billet thermal model to the heat transfer results from a high casting speed instrumented mold trial to provide a new mold taper for minimizing mold-strand interaction. Thomas and Liu et al 2,3) investigated the relation between copper plate geometry of mold and temperature distribution on the basis of a finite-element heat-transfer model and evaluated the mold design. Lu et al 4) indicated that the main factors on mold temperature are thickness of copper plate and plated nickel layer through a heat transfer model for slab casting.…”

Thermo-mechanical Behavior of Peritectic Steel Solidifying in Slab Continuous Casting Mold and A New Mold Taper Design

“…Nevertheless, many efforts have been conducted by developing mathematical models to calculate the shrinkage of solidifying shell in mold with/without the consideration of the mold wall distortion in past decades, and several types of square billet and round billet mold tapers have been proposed and applied in practical continuous casting. 1,6,7,[12][13][14][15][16][17][18]22) However, less attention [2][3][4][5][8][9][10][11][19][20][21] has been paid to the optimization of slab continuous casting mold taper despite numerous studies [23][24][25][26][27][28][29][30] of shell thermo-mechanical behavior in slab mold have been conducted. Currently, most of the practical slab continuous casting molds adopt the conventional mold taper of linear constant narrow face with ignoring the wide face structures since slab continuous casting is characterized the large ratio of width/thickness.…”

“…Currently, most of the practical slab continuous casting molds adopt the conventional mold taper of linear constant narrow face with ignoring the wide face structures since slab continuous casting is characterized the large ratio of width/thickness. Thomas and his coworkers 2,3,5,[8][9][10] predicted the curvilinear slab mold tapers of narrow face at different casting conditions according to the shrinkage profiles of shell along mold height. Similarly, Matoba et al 11) also proposed a multi-tapered narrow face mold that the upper part was set as parabola while the linear taper was given at lower part according to the deformation behavior of solidifying shell in slab continuous casting mold.…”

Thermal behaviour of moulds with different water channels and their influence on quality in continuous casting of beam blanks

“…The service life of the large hole mould is ,200 heats less than that of small hole mould before each remachining, and the service time of both moulds decreases after each grinding. 4. After 500 and 1000 heats of casting respectively, the crack rates of beam blank cast by the small hole mould are 4?10 and 6?85% lower than those of the large hole mould.…”