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Genetic Influence of Mold Corner Structure on the Strand Corner Temperature in Secondary Cooling Zone During Slab Continuous Casting

Sheng Yu, Dengfu Chen, Pei Xu, Mujun Long, Kui Lv and Huamei Duan

Abstract Mold corner structure will influence the strand comer temperature by changing fluid flow and heat transfer of liquid steel at mold corner. A three-dimensional model coupling fluid flow and heat transfer in the mold and a two-dimensional moving-slice heat transfer model in secondary cooling zone was established to investigate slab corner temperature under different mold corner structure: right-angle, big-chamfer, multi-chamfer and fillet. Results show that strand corner temperature increases obviously at mold exit through using chamfered mold. Compared with the corner temperature of right-angle strand, corner temperature of big-chamfered, multi-chamfered and fillet strand are promoted during the straightening process, which will avoid the low ductility temperature zone. When mold corner structure changed from right-angle to big-chamfer, the rise of corner temperature is much higher than that changed from big-chamfer to multi-chamfer or fillet.

Keywords Continuous casting Mold corner structure Corner temperature Secondary cooling Chamfered mold

Introduction

The corner crack of micro-alloy steel has been a serious problem in slab continuous casting. During the secondary cooling process, especially in straightening segment, the slab may have corner crack under the influence of the complex thermal stress and straightening stress. It will seriously affect the production and raise the cost. By increasing or reducing the heat transfer [1] around the strand corner to avoid the low

S. Yu (H) • D. Chen • P. Xu • M. Long • K. Lv • H. Duan College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China e-mail: This email address is being protected from spam bots, you need Javascript enabled to view it

D. Chen

e-mail: This email address is being protected from spam bots, you need Javascript enabled to view it © The Minerals, Metals & Materials Society 2017

A. Allanore et al. (eds.), Materials Processing Fundamentals 2017,

The Minerals, Metals & Materials Series, DOI 10.1007/978-3-319-51580-9_13

ductility temperature zone [2], the corner crack has been reduced but is hard to be avoided.

Chamfered mold is an effective way to improve the strand corner temperature through changing the mold corner structure. In 1994, British Steel [3] used a special mold with bevel angle to conduct industrial experiments. Then some other steelworks developed slab chamfered mold, but was not very successful [4]. In recent years, some organizations in China, like Central Iron and Steel Research Institute, have conducted a series of industrial experiments [5] and mathematical simulation [6] to promote the chamfered mold. However, these work are focused on the big-chamfered mold. The influence of different mold corner structure on the corner temperature in secondary cooling zone is not very clear.

In the present study, a three-dimensional model coupling fluid flow and heat transfer in the mold has been developed to compute the strand temperature field under different mold corner structure: right-angle, big-chamfer, multi-chamfer and fillet. Then the temperature field at mold exit was exported to the two-dimensional heat transfer model in secondary cooling zone to compute the corner temperature field. Based on the simulation results, genetic influence of mold corner structure on the strand corner temperature in secondary cooling zone was discussed during slab continuous casting.

 
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