Chernye Metally

The issue is opening by the paper "Development of new materials for managing the slag procedure during converter melting" by E. P. Volynkina, E. V. Protopopov, L. A. Ganzer and V. V. Sokolov. Physical and chemical parameters of removing slags during melting of low-carbon steels in 350 t converters at West-Siberian Metallurgical Works (ZSMK) have been examined in order to reveal features of slag frothing when using synthetic fluxes and search of efficient methods for managing the slag procedure during converter melting. It is concluded that conditions of converter melting and cleaning systems of converter gases provide environmental safety of usage of synthetic low-melting-temperature fluxes.

A. A. Kazakov, S. V. Ryaboshuk, P. V. Kovalev and L. S. Chigintsev presented the study of nature of non-metallic inclusions in segregation strip of tube steel sheets. All non-metallic inclusions revealed in segregation strip of tube steel sheet are classified. This component of metallurgical quality has essential effect of forming application properties of tubes, defining the general resource of pipelines. It is stipulated by the fact that non-metallic inclusions in tube steels are considered as one of the causes of cold shortness, low corrosion resistance, stress cracking and they also have effect on other important metal properties.

H. B. Lüngen, M. Peters and P. Schmöle devoted their publication to changing times in ironmaking. The changes in the world-wide iron production in the past decades are described and the forecasts 20 years ago forthe evolution and development ofalternative iron ore reduction processes recalled. The replacements of blast furnacesshares in iron production by alternative ways to produce steel - the direct reduction and smelting reduction processes anticipated at that timedid not become reality.

At Ferriera Valsabbia Italy an Efsop process control system was commissioned on their 80-t electrical arc furnace to improve its performance while increasing safety utilizing water detection technology, reported N. Boin, A. Vasquez and P. Levrangi. The new system measures and analyzes the offgas composition (CO, CO₂, H₂ and O₂) at the fourthhole of the EAF in real time and uses this informationfor closed loop control (CLC) process optimization.

Another survey in this issue (by A. Baaske, D. Dübers, R. Fandrich et al.) is devoted to developments, trends and availability of refractory raw materials.

New methods of simulation of continuous casting process are shown in the paper by E. A. T. Wosch and E. H. Hilgenhöner. Mouldscreen software executes calculation and allows to visualize flux film properties between shell of continuously cast billet and mould wall.

H.-G. Hartung, W. Püttgen, C. Sasse et al. analyzed economic benefits of processing line design using advanced heating technology. Direct flame impingement burners have proved to be the most effective method of strip heating.

Economical section is presented by survey of H. J. Kerkhoff entitled "Stable steel market in uncertain external conditions".

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