K. Nowacki

Silesian University of Technology, Gleiwitz, Silesian Voivodeship, Poland

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Publications (14)7.81 Total impact

  • Source
    Mateusz Koziol · Krzysztof Nowacki · Jakub Wieczorek · Tomasz Małysa

    Full-text · Article · Mar 2015
  • K. Nowacki
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    ABSTRACT: One of significant factors affecting properties of steel is uniform distribution of non metallic inclusions and alloy elements across the steel product cross-section. Acoustic treatment may be the final technological stage enabling the quality of steel to be influenced. Further research to be undertaken in this field should be focused on the design of power heads with application of a stack of several piezoceramic elements or what is referred to as a mosaic head, or consisting in simultaneous use of several heads. What is additionally required is to determine ranges of parameters of the acoustic treatment process for individual groups of steel grades.
    No preview · Article · Jan 2015 · Metalurgija -Sisak then Zagreb-
  • T. Lis · K. Nowacki · M. Żelichowska · H. Kania
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    ABSTRACT: In the paper was presented innovative solutions of sludge and dust management generated by metallurgical enterprises. These solutions are as follows: usage of steelmaking dust in production of decorative glassware and deoiling of metallurgical sludge useful in producing of iron-bearing briquette for electric arc furnaces (EAF). The influence of the aforementioned technologies on the environment was also discussed.
    No preview · Article · Jan 2015 · Metalurgija -Sisak then Zagreb-
  • Teresa Lis · Krzysztof Nowacki · Tomasz Małysa
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    ABSTRACT: The iron and steel industry is one of the largest sources of waste materials, primarily in the form of steelmaking dusts, sludge and slag. Those wastes are a serious threat to the environment. Main precondition for the protection of natural resources in the environment is to recover raw material and energy from waste. The use of waste as raw materials does not involve the storage and creates the possibility of closure of the existing landfill. The article presented utilization of metallurgical waste containing 4-20 wt. % zinc in non-metallurgical industry. Chemical analysis of pollutants contained in waste (dusts, sludge and slag) and in manufactured products (cement bricks, ceramic construction materials, coloured glass products and slag for road construction) was performed. Aqueous extracts analysis results were compared with the maximum values for the sewage entering into water and soil. The performed research proves that proposed technologies (production of cement clinker, construction bricks, hollow glass, decorated glass) do not pose threat to environment. Harmful impurities are eluted from the products - clinker, constructions bricks and slag after the recovery of zinc recovery. Proposed technologies substitution of primary raw materials recyclable materials can reduce environmental degradation.
    No preview · Article · Dec 2013 · Solid State Phenomena
  • Source
    J. Szymszal · T. Lis · J. Przondziono · K. Nowacki · J. Kliś
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    ABSTRACT: It has been found that the area where one can look for significant reserves in the procurement logistics is a rational management of the stock of raw materials. Currently, the main purpose of projects which increase the efficiency of inventory management is to rationalise all the activities in this area, taking into account and minimising at the same time the total inventory costs. The paper presents a method for optimising the inventory level of raw materials under a foundry plant conditions using two different control models. The first model is based on the estimate of an optimal level of the minimum emergency stock of raw materials, giving information about the need for an order to be placed immediately and about the optimal size of consignments ordered after the minimum emergency level has occurred. The second model is based on the estimate of a maximum inventory level of raw materials and an optimal order cycle. Optimisation of the presented models has been based on the previously done selection and use of rational methods for forecasting the time series of the delivery of a chosen auxiliary material (ceramic filters) to a casting plant, including forecasting a mean size of the delivered batch of products and its standard deviation.
    Preview · Article · Sep 2013
  • K. Nowacki · P. Musiał · T. Lis
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    ABSTRACT: Acoustic steel processing in an ingot mould may be the fi nal stage in the process of quality improvement of a steel ingot. The impact of radiation and cavitation pressure as well as the phenomena related to the acoustic wave being emitted and delivered to liquid steel aff ect various aspects including the internal structure fragmentation, rigidity or density of steel. The article provides an analysis of the mechanism of impact of physical phenomena caused by an acoustic wave aff ecting the quality of a steel ingot.
    No preview · Article · Apr 2013 · Metalurgija -Sisak then Zagreb-
  • T. Lis · P. Musiał · K. Nowacki
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    ABSTRACT: The metallurgical industry is one of the largest sources of wastes. Some of them, however, owing to their content of metals such as zinc or iron, may become valuable secondary raw materials. In order to achieve that purpose, they require appropriate preparation. This article provides a discussion on the methods of preparation of scrap from steelworks, namely deposits containing iron oxides, enabling their recycling.
    No preview · Article · Jan 2013
  • H. Kania · K. Nowacki · T. Lis
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    ABSTRACT: The paper presents results of measurements of the thickness of liquid slag layer in concast mould for pulverized, granulated or formed mould powder. The thickest layer of liquid slag was obtained for formed powders.
    No preview · Article · Jan 2013
  • Teresa Lis · Krzysztof Nowacki
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    ABSTRACT: Electric arc furnace dusts are among the most environment polluting wastes. Numerous utilization technologies have been developed for dusts containing up to 4% of Zn and more than 20% of Zn. However, the remaining part of steelmaking dusts are the most problematic ones, as they are mostly dumped generating costs and posing serious environmental threats. This paper provides an analysis of the potential utilization options for dusts containing ca. 10% of zinc generated in a single electric steelmaking shop. Physical and chemical properties of dusts have been determined and examined, and furthermore, results of the studies on the EAFD utilization in production of cement clinker and industrial glass have been discussed. It has been found that a particularly beneficial feature of the production technology proposed is that the iron content exceeds 30%. The influence of the dusts used on the functional properties of the products obtained has been established as well as the environmental impact of the processes and products in question and the dust mass possible to be utilized in the production technology proposed have been determined.
    No preview · Article · Sep 2012
  • T. Lis · K. Nowacki
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    ABSTRACT: Recycling of by-products of the steelmaking process in electric arc (EAF) furnaces is an important activity from the perspective of environmental protection as well as the steelmaking industry itself. This article is a discussion concerning the selected research results in terms of utilisation of steelmaking dusts containing 4 - 12 % of zinc in manufacture of cement bricks, ceramic construction materials as well as coloured glass products. The research conducted has implied that using steelmaking dusts in non-metallurgical industries is both possible and reasonable.
    No preview · Article · Apr 2012 · Metalurgija -Sisak then Zagreb-
  • Source
    H. Kania · K. Nowacki
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    ABSTRACT: The paper presents results of industrial experiments with application of mould powders characterized with similar chemical composition, with different density and form: pulverized, granulated and formed. Impact of mould powder form on intensity of lubrication and its consumption is defined on the basis of the results of industrial tests of continuous casting of low carbon steel, 1030x220 mm format.
    Preview · Article · Jan 2012 · Archives of Metallurgy and Materials
  • K. Nowacki · W. Kasprzyk
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    ABSTRACT: In this article, results of the measurements of the longitudinal and transverse wave velocities in steel have been presented as a function of temperature. The conducted tests involved two types of corrosion-resistant steel: X14CrMoS17 and X90CrMoV18. The tests were based on the ultrasonic wave transition method using transducers operating at 5.4MHz for the longitudinal wave and 3.2MHz for the transverse wave. Measurements of the wave velocity were taken at temperatures from 293K to 1,173K. The longitudinal wave velocity in X14CrMoS17 steel varies from 6,002m·s−1 at 293K to 5,115m·s−1 at 1,173K, while the velocity in the X90CrMoV18 steel changes from 5,975m·s−1 at 293K to 5,381m·s−1 at 1,023K. The transverse wave velocities vary from 3,239m·s−1 at 293K to 2,449m·s−1 at 1,173K in X14CrMoS17 steel, and from 3,251m·s−1 at 293K to 2,478m·s−1 at 1,173 K in X90CrMoV18 steel. The obtained results represented a basis for determination of the properties of the steels examined, such as Young’s modulus, Poisson’s ratio, Helmholtz’s modulus of volume elasticity, or Lame’s constants. The results have been verified by comparing the Young’s modulus obtained with the values corresponding to individual steel grades and temperatures (293K, 373K, 473K, 573K, and 673K) obtained by traditional methods of measuring mechanical properties as provided in PN-EN 10088-1:2007. The results of this comparison confirmed the reliability of the conducted investigation.
    No preview · Article · Jan 2010 · International Journal of Thermophysics
  • W. Kasprzyk · K. Nowacki
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    ABSTRACT: This paper concerns structural assumptions for a piezoceramic head for sound amplification of liquid steel in industrial conditions. The head in question is to replace magnetostrictive heads used in laboratory conditions exclusively. Sound amplification is assumed to improve the internal structure of steel. The head consists of a three-layer transducer, a stepping concentrator with an exponential notch, and a wave-guide finished with a replaceable bit submerged in liquid steel. In order to optimally insulate the piezoceramics in the transducer, being sensitive to temperature, a new method of calculating the passive layers was required to be developed so that the radiant layer was the thickest one (on maintenance of the preset frequency of resonant vibrations). This paper contains a description of the method of selecting thicknesses of the individual transducer layers which were experimentally verified by constructing a head prototype and its application for sound amplification of steel ingots of 130 kg of mass.
    No preview · Article · Jan 2010 · International Journal of Thermophysics
  • Source
    Nowacki K
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    ABSTRACT: Properties of steel depend also on its internal structure. In practice, one can distinguish between primary structure (obtained during solidification) and secondary structure (being a result of the γ phase transition into the α phase during hot working or heat treatment). The grain refinement degree obtained is assessed with microscopic examination. In this work an alternative method is proposed in the determination of the steel microstructure refinement degree. The method is based on the dependence between the high frequency sound attenuation coefficient and the average grain diameter. Sound in steel increases when the average steel grain diameter approximates the ultrasonic wave length, because of the scattering of waves on grain boundaries.
    Preview · Article · Apr 2009 · Metalurgija -Sisak then Zagreb-