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Decarburisation and degassing of high-alloyed Cr steels under vacuum
Ertelt, Tomáš ; Pernica, Vítězslav (referee) ; Záděra, Antonín (advisor)
The work deals with the investigation of the effects of vacuum degassing and decarburization in high alloyed stainless steel. The reason for this is to increase corrosion resistance and mechanical properties. The theoretical part is devoted to the analysis of options to reduce carbon, nitrogen, hydrogen and manganese at atmospheric pressure and in vacuum. In experimental part there is the description of melting, calculation of conditions facilitating reduction of oxide inclusions as a function of the gas pressure in the furnace and the evaluation of the influence of vacuum on the content reduction of carbon, nitrogen and manganese.
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Application of secondary metallurgy during steel manufacture
Škeřík, Filip ; Fila, Pavel (referee) ; Záděra, Antonín (advisor)
This bachelor thesis is a literary research on the use of secondary metallurgy in steel manufacture. It contains the basic division of SM and a brief description and use of individual processes. The main part is focused on the description of the structural parts of the electric arc furnace, ladle furnace and VD/VOD device. The second part of the thesis is devoted to an experiment, where the technical- economic costs of production of low and medium alloyed steels and high alloyed steels are compared. It includes costs on charging, electricity consumption, graphite electrode consumption and furnace and cover lining.
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The study of increase in efficiency of manufacturing preparation of technology
Šudoma, Michal ; Lána, Ivo (referee) ; Jurová, Marie (advisor)
This paper discusses different alternatives of more efficient preparation of spheroided graphite cast iron production. Secondary metallurgy and chemical heating technology are used to recast cast iron fused in copula furnace. The work applies the known physical-chemical rules used in the production of quality spheroided graphite cast iron in regular production conditions. Based on the previous developments, the aim was to prepare implementation of verified secondary metallurgy processes in adjusted casting ladle. The casting ladle was adjusted in order to allow execution of all processes required in order for the relevant standards and material lists requirements to be met in respect to spheroided graphite cast iron quality. Comments regarding the trends in ferroalloy metallurgy and related marketing approach of the company. The work is concluded by a summary of advantages brought in by the new approaches compared to the traditional ones from the economical as well as environmental perspective.
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Secondary metallurgy of steel
Neduchal, Bronislav ; Balcar, Martin (referee) ; Záděra, Antonín (advisor)
This bachelor thesis focuses on dividing of individual processes of secondary metallurgy, which are being used in steel foundries. It describes the influence of individual ingredients contained in the steel, the molten aggregate, the dividing of individual processes of secondary metallurgy and the metallurgical possibilities and advantages of individual processes. The practical part focuses on evaluation of individual layers of low-alloy steel GS20Mn5 using two EOP and EOP-LF-VD methods, as well as high-alloy steels X20Cr13 using the EOP-LFVOD method.
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History of ferrous alloys manufacture in the Foundry of ŽĎAS, a. s.
Nejedlý, Tomáš ; Pernica, Vítězslav (referee) ; Šenberger, Jaroslav (advisor)
The thesis describes the history of modern age of steel production in Ţďár region, and the history of metallurgical engineering company ŢĎAS. The work is divided into the theoretical part of the steel production on electric arc furnaces along with brief history from steel production in bloomery furnace to the modern steel manufacturing technology - secondary metallurgy. The second part describes the history of steel production in Ţďár region until the formation of metallurgical engineering company ŢĎAS, and consequently the company development from the construction to the present day. The thesis are focused on the development of secondary metallurgy by which the ŢĎAS company can reach the steel with high level of micro cleanness and high level of mechanical properties. Using by this technology the company can extend its product range by introducing new steel grades. Thanks to the continuous progress and efforts to achieve the best results in steel quality, the ŢĎAS company be among the largest producer of quality steel not only in the Czech Republic.
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History of steelmaking
Houzar, David ; Kaňa, Václav (referee) ; Šenberger, Jaroslav (advisor)
Bachelor´s thesis is a technical summary describing the history of steelmaking. It is focused on time period from 1950s to nowadays. There has been mentioned the ancient history of steelmaking and ironmaking. The thesis also deals with kinds, composition and structures of the steel, with principle of making row iron and also priciples of steelmaking – electric furnace, oxygen converter and basic procedures of secondary metallurgy. There is mentioned a direct making of iron from the ore as well.
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Influence of using the secondary metallurgy on steel properties
Navrátil, Horymír ; Fila, Pavel (referee) ; Záděra, Antonín (advisor)
This bachelor thesis describes metallurgical processes of production of steel in electric arc furnaces. It also describes oxidation and reduction phases of melting. Furthermore, it describes the main elements of secondary metallurgy used in steel foundries and their applications. The thesis also concerns with impurities in the steel, namely non-metallic inclusions, gases and trace elements, which is also connected with final utility properties of the steel. This thesis also describes in detail the technological properties of steel. The influence of several selected elements on steel properties is also described. Finally, the thesis evaluates the effect of secondary metallurgy on the volume of defects in steel castings, on mechanical properties and the resulting chemical composition.
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Secondary metallurgy of steel
Neduchal, Bronislav ; Balcar, Martin (referee) ; Záděra, Antonín (advisor)
This bachelor thesis focuses on dividing of individual processes of secondary metallurgy, which are being used in steel foundries. It describes the influence of individual ingredients contained in the steel, the molten aggregate, the dividing of individual processes of secondary metallurgy and the metallurgical possibilities and advantages of individual processes. The practical part focuses on evaluation of individual layers of low-alloy steel GS20Mn5 using two EOP and EOP-LF-VD methods, as well as high-alloy steels X20Cr13 using the EOP-LFVOD method.
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Application of secondary metallurgy during steel manufacture
Škeřík, Filip ; Fila, Pavel (referee) ; Záděra, Antonín (advisor)
This bachelor thesis is a literary research on the use of secondary metallurgy in steel manufacture. It contains the basic division of SM and a brief description and use of individual processes. The main part is focused on the description of the structural parts of the electric arc furnace, ladle furnace and VD/VOD device. The second part of the thesis is devoted to an experiment, where the technical- economic costs of production of low and medium alloyed steels and high alloyed steels are compared. It includes costs on charging, electricity consumption, graphite electrode consumption and furnace and cover lining.
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Influence of using the secondary metallurgy on steel properties
Navrátil, Horymír ; Fila, Pavel (referee) ; Záděra, Antonín (advisor)
This bachelor thesis describes metallurgical processes of production of steel in electric arc furnaces. It also describes oxidation and reduction phases of melting. Furthermore, it describes the main elements of secondary metallurgy used in steel foundries and their applications. The thesis also concerns with impurities in the steel, namely non-metallic inclusions, gases and trace elements, which is also connected with final utility properties of the steel. This thesis also describes in detail the technological properties of steel. The influence of several selected elements on steel properties is also described. Finally, the thesis evaluates the effect of secondary metallurgy on the volume of defects in steel castings, on mechanical properties and the resulting chemical composition.
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