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No. 2/2020
JMM 2-20 okladka.jpg
The cover of the JMM issue 2/2020

Contents


Bogdan GARBARZ
Jarosław MARCISZ

Łukasiewicz Research Network – Institute for Ferrous Metallurgy

Krzysztof ŻÓŁKIEWSKI
Paweł LUBOWIECKI
Bogusław NOWAK

ALCHEMIA S.A.

Marek SMOLEŃ

Walcownia Blach Batory Sp. z o.o.

Marcin SKURCZYŃSKI

HEATMASTERS Poland Sp. z o.o.

INDUSTRIAL TECHNOLOGY OF MANUFACTURING ULTRA-STRENGTH NANOBAINITIC STEEL PLATES

Nanobainitic steel grades are a new construction material with a strength in the range of 1.9–2.2 GPa, at the same time characterised by good plasticity. Currently, the works on the development of nanobainitic steels at Łukasiewicz – IMŻ have entered the commercialisation phase. One of the main applications of ultra-strength nanobainitic steel plates is armour systems. In order to optimise the parameters of the production process of nanobainitic steel plates, microstructure examination and measurement of mechanical properties were carried out at intermediate stages of production and after final heat treatment. The results of industrial steel and plate production operations were assessed, including smelting and casting into ingot moulds, preparation of the rolling mill charge, hot rolling, plate production as well as intermediate and final heat treatment. Critical technological operations that may adversely affect the quality and performance of plates were identified. The directions for technology modification that reduce or eliminate threats of plate deterioration were formulated.
Keywords: ultra-strength structural steel, nanobainite, manufacturing of plates, phase transformations, microstructure, mechanical properties


Mariusz BORECKI
Janusz STECKO
Wacław WITTCHEN

Łukasiewicz Research Network – Institute for Ferrous Metallurgy

Agnieszka DOMAGAŁA-GOLENIEWSKA

PEDMO S.A.

Dariusz KNAPEK

EC TEST Systems Sp. z o.o.

DEVELOPMENT OF SLIDE GATE POWDER WITH EMERGENT STRUCTURE TECHNOLOGY PRODUCTION

The paper presents the research work carried out at Ł–IMŻ on the optimisation of the technology for producing an innovative powder for slide gates as part of a research project carried out for PEDMO S.A. in Tychy. Attention was paid to the developed method for assessing the efficiency of coating powder grains with a sintering process inhibitor using thermal analysis. It is an important element in assessing the quality of the powder, and thus allowed to optimise the parameters of its production technology. In order to determine the effectiveness of coating powder grains with a carbon layer of sintering inhibitor, a number of experiments were carried out using a thermal analyser, controlling the type of gases emitting during sample heating, therefore the influence of various factors on the mixer working temperature, such as the temperature in the production hall, raw material temperature and mixer operation time, was examined. An additional area of study was the registration and analysis of acoustic signals emitted by the mixer, carried out in cooperation with EC TEST Systems to develop an objective method for determining the end of the powder coating process, which can be implemented in a production line automation system.

Keywords: slide gate, powder, thermal analysis, thermal imaging, sound analysis


Janusz STECKO
Marian NIESLER
Piotr RÓŻAŃSKI

Łukasiewicz Research Network – Institute for Ferrous Metallurgy

CHARACTERISATION OF IRON ORES AND CONCENTRATES WITH THE USE OF LABORATORY SINTERING TESTS ON A SEMI-INDUSTRIAL SINTERING PAN

The article presents the characteristics of iron ores and concentrates in terms of assessing their impact on the sintering process and on the physicochemical properties of the sinter. The article describes the methodology for conducting laboratory sintering tests on a pan using the line for semi-industrial simulation of sintering of iron ore and waste as well as other auxiliary devices at the Primary Processes Unit of the Łukasiewicz – Institute of Ferrous Metallurgy. The results of the influence of various dusty components (concentrates), fine-grained iron ores (sinter ores) and addition of quicklime to the mixture on the basic parameters of the sintering process are also included. The results of tests on the properties of sinters made from various sintering mixtures are also presented.

Keywords: sintering of iron ores, content of concentrates, productivity, fuel consumption


Krzysztof KOSTRZEWA
Włodzimierz KUTERA

Grupa PGO, PIOMA – Odlewnia Sp. z o.o.

Bogdan ZDONEK
Artur ŻAK
Ireneusz SZYPUŁA

Łukasiewicz Research Network – Institute for Ferrous Metallurgy

Jan JEZIERSKI

Silesian University of Technology, Faculty of Mechanical Engineering

APPLICATION OF THE AOD PROCESS IN THE PRODUCTION OF STEEL CASTINGS TO USE IN EXTREME OPERATING CONDITIONS

Requirements for the use of steel castings in extreme conditions apply to grades from low- to high-alloyed produced with the use of secondary treatment of cast steel in order to obtain very accurate regulation of the chemical composition and to ensure very high purity of the cast steel. The optimal solution for foundry conditions was the use of an AOD converter (for the first time in Poland) for the refining of steel cast from electric arc furnace. In terms of internal quality, low-alloy cast steel castings for low temperature operation, high-alloy martensitic cast steel for high temperature operation and high-alloy duplex casting for high corrosive environments were tested. The application of the AOD process will provide the foundry with a significant increase in its domestic and international portfolio, while increasing the profitability of the foundry’s production.

Keywords: AOD converter, steel casting, extreme working conditions


Piotr RÓŻAŃSKI
Krzysztof RADWAŃSKI
Marian NIESLER
Dariusz WOŹNIAK
Bogdan ZDONEK
Artur MAZUR
Valeriy PIDVYSOTS’KYY
Roman KUZIAK

Łukasiewicz Research Network – Institute for Ferrous Metallurgy

Grzegorz MARACHA
Wojciech FRAŚ

ArcelorMittal Poland S.A.

INNOVATIVE HIGH-SILICON STEEL WITH REGULATED LOW CONTENT OF CONTAMINATIONS WITH CONTROLLED MORPHOLOGY AND APPROPRIATE LEVEL OF AlN INHIBITOR INTENDED FOR HIGH-QUALITY TRANSFORMER PLATES

The article presents the process and results of industrial tests carried out as part of the 1st Stage of the project, the final goal of which is to develop an innovative new-generation electrical steel designed for the manufacture of transformer plates with high magnetic permeability (high inductance of 1.9 T and low lossiness of 0.8 W/ kg) and with oriented grain (HGO type) together with the technology of its production in the scope of: melting of steel in a converter with ladle treatment taking into account vacuum degassing of steel in a demonstration installation, continuous casting of flat ingots and their hot rolling for further processing. The remaining stages of transformer plate production, including cold rolling, inter-operational heat and thermo-chemical treatment, as well as surface treatment operations, are a trade secret. As part of the 1st Stage of the project, numerical and physical simulations of melting, casting and hot rolling of steel with assumed quality parameters were carried out in order to obtain material for further research. The melting and casting processes parameters were determined to ensure obtaining the appropriate quality of steel with a maximum total oxygen content of 12 ppm and the surface fraction of non-metallic inclusions of max. 0.05%, technical and technological requirements for the device for liquid steel processing in vacuum constituting the demonstration installation were determined, and a rheological model of transformer steel for the sheet hot-rolling process was developed, with the use of which preliminary simulations were carried out to obtain temperature, deformation and strain rates in the rolled strip.

Keywords: electrical steel, oriented grain, numerical and physical modelling, melting, casting, hot rolling


 

2020-06-03


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