Refractory objects and materials for continuous steel casting

Abstract

In the OAO Borovich Refractory Combine production has been assimilated for a complete set of refractories for continuous steel casting, i.e. from a pipe for protecting a stream of metal to a submerged nozzle. In technical and life characteristics the products correspond to that of world analogs, they provide accident free steel pouring, make it possible to reduce the specific consumption of refractories per ton of steel, to increase CBCM productivity, to reduce billet scrap, and to reduce steel cost.An increase in the proportion of steel continuous casting within the general volume of steel billet production and the complication of metallurgical processes is associated with an increase in the role of refractories not only from a technical, but also from an economic point of view. Refractories of a new generation for metallurgical production should exhibit high mechanical strength, high erosion and corrosion resistance properties under operating conditions at high temperature in media of a different chemical nature (melts, slags, etc.), wear resistance (including hydrodynamic effects), heat resistance etc. Use of these refractories will make it possible to reduce their specific consumption per ton of steel, to increase CBCM productivity, to reduce billet scrap, and to reduce steel cost.Due to the competent innovation policy and correct distribution of resources for providing the increasing requirements of metallurgists OAO Borovich Refractory Combine (BKO) under its own efforts and drawing on outside specialists is carrying out work for improving the manufacturing technology of articles for continuous steel casting with the aim of increasing their life. The Combine has bought expensive equipment that makes it possible to determine a set of service characteristics and refractory properties, with considerable reliability for predicting article life for customers. The list of refractory products monitored and standard quality indices is constantly expanding.OAO Borovich Refractory Combine produces a whole set of refractories for continuous steel casting: pipes for protecting the metal jet from secondary oxidation in the area of the steel pouring ladle, i.e. CBCM intermediate ladle, articles and mixes for the control and working lining of an intermediate ladle,articles for organizing metal flow into the intermediate ladle,stopper-monoblocks, dispenser nozzles, submersed nozzles. PIPES FOR PROTECTING THE METAL STREAM FROM SECONDARY OXIDATIONIn order to protect the metal stream from secondary oxidation in the area of the steel-pouring ladle, i.e. the intermediate ladle, there is traditionally use of pipes of corundum composition. OAO BKO has assimilated production of corundum-graphite pipes for protecting the metal stream grades TKG and TKGU (Table 1). The articles are manufactured by innovative technology on the basis of powders of fuzed corundum of different fractions, graphite and special additions that increase the heat resistance and wear resistance of articles. In order to provide the required article life for gra...

Finite element analysis applied to redesign of submerged entry nozzles for steelmaking

“…The second function of the refractory nozzles is to protect the liquid steel flow from the possibility of oxidation by air during casting which would result in unacceptable levels of oxide inclusions in the steel. The life of such nozzles is invariably short, typically on the order of some hundreds of minutes [1].…”

On Modelling Parasitic Solidification Due to Heat Loss at Submerged Entry Nozzle Region of Continuous Casting Mold

“…Refractory properties are important for the heat transfer, wear, and thermal stress resistance of a material [52,53]; gas bubble formation [54]; and clogging rate, among others. SEN clogging causes an asymmetric flow pattern, parasitic solidification at an SEN, hook formation at a meniscus, local shell thinning, and breakouts since the forced convection plays a crucial role in solidified shell formation [55,56].…”