Krystian Janiszewski

Technological Effects of Metallurgical Industry Restructuring in Poland

The publication presents changes occurring in technological processes of producing steel after transformation of economic system in Poland after year 1989 and conducted repair programs within restructuring of metallurgical industry of iron and steel. Changes were based on withdrawals of economically unprofitable technologies, including open hearth furnaces through expansion of electrical and converter technologies of steel manufacturing up to activities which were connected with changing the profile of manufactured assortment.

The Influence of Thermodynamic Conditions for Steel Filtration Efficiency

The work presents theoretical grounds for the process of refining molten steel from liquid non-metallic inclusions, using the method of filtration with ceramic filters - the thermodynamic precondition to the absorption of liquid non-metallic inclusions on the surface of a ceramic filter.

Trends Development of Machines Operation Maintenance in Metallurgical Companies in Poland

European metallurgy industry has to invest in technologies and machines in order to remain competitive on the world market. One of the areas of innovational solutions is concept of TPM – Total Productive Maintenance. The article presents the development of productive maintenance concept in chronological order in the conditions of economic system transformation (from central planning economy to the rules of free market) in metallurgical companies in Poland.

Causes of Increased Number of Non-Metallic Inclusions in Filtered Steel

Common phenomenon observed during steel filtration in laboratory conditions is the increased number non-metallic inclusions. These are the smallest inclusions in the Ferret diameter range from 0.5 to 6 μm. This phenomenon concerns only the number of inclusions. The analysis of literature shows that there is no explanation of this in the previous research, for example [1, 3]. Therefore, this paper attempts to explain the important relationship that was so far overlooked.

Thermal Analysis Results and the Theoretical Determination of Solidus and Liquidus Temperatures for the Grain Oriented Electrical Steel

This paper is devoted to the comparison of theoretically defined solidus and liquidus temperatures based on above mentioned theoretical methods with the results of high-temperature thermal analysis carried out on two devices (Netzsch STA 449 F3 Jupiter; Setaram SETSYS 18TM). On large samples (23 g), the method of direct thermal analysis was applied. On small samples (200 mg), the experiments using differential thermal analysis were realized. It was found out that the solidus and liquidus temperatures for the studied steel grade can vary in dependence on the used determination method. The used methodology of thermal analysis is fully reproducible, and the these thermo-analytical results can be considered as necessary for the correct setting of critical parameters in applied research on the process of steel casting.

Industrial Experiments Filtration of Steel

The research on the process of steel filtration from non-metallic inclusions is currently entering the last phase of industrial experiments. Their positive effects confirm the previous theoretical assumptions and laboratory tests. The application of steel filtration as a permanent technological operation in the process of steel casting will remarkably improve its metallurgic purity. An additional advantage will be diminishing the probability of covering the outlet nozzle of a tundish. This paper presents an outline of the experiment results mentioned above.

Strategic Investments of Restructured Metallurgical Companies in Sustainability Business

The article presents the strategic investments implemented in metallurgical enterprises in Poland in time of economical changes. After 1989 Polish steelwork plants started restructuring process connected with technological investments. Polish steelwork plants became a part of foreign capital groups or domestic capital groups. Privatised metallurgical enterprises after economic transformation gradually implemented new technology to their business activities. In the publication an overview of the definitions of strategic and development investments was conducted together with the presentation of the key investments which influence the sustainability of the business in the metallurgical enterprise on Polish market. As a case study was used ArcelorMittal Poland company. In 2004 international concern LNM (ArcelorMittal Poland today) bought the biggest Polish steelwork plants. Since that time the capital group invested 3 billion zlotys in new technology and modernization of the plants. Key strategic investment projects in the company were characterized in the paper.

The Influence of Slenderness Ratios of Multi-Hole Ceramic Filters from SF - 1.67 to SF - 8.36 of Filter Surface on Efficiency of Liquid Steel Refining from Non-Metallic Phase

We propose in this publication the introduction of new, additional definition describing the multiple orifice ceramic filters used in research works on the liquid steel filtrations, calling this the filter slenderness ratio. In order to confirm the theoretical assumptions we have performed a series of the laboratory scale experiments (for the filter slenderness ratio SF - 1.67 to SF - 8.36). The influence of the filter slenderness on the filtration process efficiency has been determined through variations in quantities and surface shares of the non-metallic phase in the filtrated steel in relation to the non-filtered steel. We present also the results of researches on the separating surfaces between the liquid steel and the ceramic filter material, which in form of photos and scanning microscope microanalyses are put together in the publication.

Classification and Assessment of Environmental Aspects of Converter and Electric Steel Plants

The topic of this publication is classification and assessment of environmental aspects in metallurgical enterprise on an example of steel plant. The analysis included aspects which have negative influence on the environment. Taking into account the structure of the proceedings of the process of melting steel in converter and electric furnaces there were key aspects established which are treated as priority in investment programs and current activities within environmental protection process in order to limit their negative influence on the environment. The publication proposes a method of acting in the assessment of environmental aspects for each type of steel plant. The publication can be useful for the engineers and technologies from staff and to services taking care of environmental protection in metallurgical enterprises.

Influence of the Steel Scrap Classes on the Liquid Steel Output Melt in Electric Arc Furnace

The paper analyses methods, the influence of use of charges of steel scrap of different qualities in the EAF on the index of liquid steel output from a melt using statistical analysing methods. The used research methodology consists of analytical simulation of variations in mass of liquid steel obtained from melts differing in steel scrap content in the metallic charge and of statistical analyses of industrial results acquired from the corresponding process documentation (so called melt cards). The obtained research results can be utilized in each steelmaking facility, which employs the Electric Steelmaking process, in order to “design” the metallic charge compositions, having in view the quality and economic aspects. The results presented in this paper are directed to the steelmakers employing the Electric Steelmaking process and constitute the authors original study.