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No. 1/2021
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Contents


Adam ZIELIŃSKI

Łukasiewicz Research Network – Institute for Ferrous Metallurgy

THE ROLE OF INSTITUTE OF FERROUS METALLURGY IN THE DEVELOPMENT OF MATERIALS FOR THE POWER INDUSTRY

The article presents an outline of the development of the domestic energy sector from the very beginning of its operation. It discusses the impact of the research conducted at the Stanisław Staszic Institute of Ferrous Metallurgy in Gliwice on the selection of steel grades for operation at elevated and high temperatures for applications in the Polish power industry. The article presents the research and implementation achievements of the research workers of the Institute with the discussion and the purpose of their creation. The article presents the area of joint scientific and research achievements of the Institute of Ferrous Metallurgy with affiliated domestic and foreign research centres, documented by numerous research projects and publications in renowned scientific journals.

Keywords: creep laboratory, steels and alloys for the power industry, diagnostics


Roman KUZIAK
Valeriy PIDVYSOTS’KYY

Łukasiewicz Research Network – Institute for Ferrous Metallurgy

Łukasz RAUCH
Maciej PIETRZYK

AGH University of Science and Technology

Tomasz ZYGMUNT

Arcellor Mittal Poland

METHOD FOR HEAT TREATMENT OF THE RUNNING SURFACE OF THE HEAD OF THE PEARLITIC STEEL RAILS

The paper deals with the new approach to the optimization of the pearlitic rail’s head hardening process aimed at balancing the relation between strength and ductility of the head running surface. In the industrial process, efforts have been undertaken so far to maximize the hardness of the rail’s head while maintaining its pearlite structure, resulting in obtaining enhanced wear resistance and resistance to the contact fatigue defects initiation. The new approach, described in this paper, aims at designing the head hardening process enabling achievement of the high hardness of the running surface combined with high ductility expressed in terms of the total elongation. To achieve this aim of the investigation, a computer program was developed capable of predicting the occurrence of the phase transformations during rail head cooling and microstructure features after cooling. The program was linked with dedicated inverse module enabling the adjustment of the cooling conditions to achieve the required state of the pearlitic structure.

Keywords: perlitic rails, heat treatment, mechanical properties, wear, contact fatigue defects


Bogdan ZDONEK
Piotr RÓŻAŃSKI
Mariusz BORECKI
Janusz STECKO
Ireneusz SZYPUŁA

Łukasiewicz Research Network – Institute for Ferrous Metallurgy

STUDY ON REMOVAL OF COPPER, TIN AND ARSENIC FROM IRON ORE, SCRAP AND STEEL IN THE LIGHT OF THE LATEST STATE OF METALLURGICAL TECHNOLOGY

The study investigates the ability to remove copper, tin and arsenic from iron ore, scrap and liquid steel based on the literature and thermodynamic calculations using the FactSage 7.2 software. Methods of removing Cu, Sn and As from iron-bearing materials, feasible in industrial conditions in the near term, were selected. Simulation tests with the use of the FactSage 7.2 software showed that under reduced pressure conditions Cu and Sn can be removed from the steel bath, while As evaporation is not possible. Laboratory tests were carried out, including the removal of Sn and Cu in the process of degassing of liquid steel in a deep vacuum in a vacuum induction furnace and the removal of Sn from iron ore in the sintering process. Under conditions of deep vacuum (below 40 Pa), high temperature (1670°C) and a correspondingly long vacuum treatment time (over 30 minutes), the efficiency of removing the copper and tin contents from the liquid steel of approximately 14 and 17% respectively was obtained. The iron ore sintering test with a high Sn content showed the effectiveness of reducing the Sn content during this process, amounting to approx. 30%.

Keywords: steel, vacuum degassing, iron ore, sintering, copper, tin, arsenic


Bartłomiej WALNIK
Dariusz WOŹNIAK
Aleksandra NIESZPOREK
Mariusz ADAMCZYK

Łukasiewicz Research Network – Institute for Ferrous Metallurgy

STUDY ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF 42CrMo4/NANOS-BA® HIGH-STRENGTH CLAD PLATES AFTER THE PROCESS OF HOT ROLLING AND TWO-STAGE HEAT TREATMENT WITH ISOTHERMAL TRANSFORMATION

The aim of the study was to develop a technology for welding non-weldable 42CrMo4 and NANOS-BA® steel grades in the process of hot rolling and two-stage heat treatment. As a result of physical experiments carried out in a line for semi-industrial simulation of the production of metals and their alloys (LPS) and additional heat treatment, a durable combination of 42CrMo4 and NANOS-BA® steels with high mechanical properties was obtained, including: Rp0.2 = 1036 MPa, Rm = 1504 MPa and A = 10.9%, without microscopically visible cracks and other discontinuities in the joined surface. The quality of the 42CrMo4/NANOS-BA® clad plates produced in this way was assessed on the basis of microstructure examination as well as bending, shear and tensile strength tests.

Keywords: clad plates, hot rolling bonding, nanostructured steel


RESEARCH PROJECTS FUNDED FROM THE INSTITUTE’S OWN FUNDS – ABSTRACTS

2021-06-08


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