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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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Optimization of heavy steel castings manufacture
Procházka, Zdeněk ; Čech, Jan (referee) ; Šenberger, Jaroslav (advisor)
The Master’s thesis was conducted under the project FR-TI1/070 “Optimalization of heavy steel casting manufacture” in cooperation with ŽĎAS a. s. foundry. It evaluates rate of conchoidal fracture in samples extracted from experimental castings. The testing bar for the static tensile test were extracted from thermal axis of casting. The research part describes ways of deoxidating the liquid metal and usage of separate deoxidating chemical parts, followed by summary of research knowledge on conchoidal fractures. In the practical part, the process of sample evaluation is described. The conchoidal fracture, the surface of which was evaluated on the fracture surfaces, influences mechanical qualities of cast steel. Simultaneously, impacts of metallurgical factors on rate of conchoidal fracture were examined
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Optimization of heavy steel castings manufacture
Procházka, Zdeněk ; Čech, Jan (referee) ; Šenberger, Jaroslav (advisor)
The Master’s thesis was conducted under the project FR-TI1/070 “Optimalization of heavy steel casting manufacture” in cooperation with ŽĎAS a. s. foundry. It evaluates rate of conchoidal fracture in samples extracted from experimental castings. The testing bar for the static tensile test were extracted from thermal axis of casting. The research part describes ways of deoxidating the liquid metal and usage of separate deoxidating chemical parts, followed by summary of research knowledge on conchoidal fractures. In the practical part, the process of sample evaluation is described. The conchoidal fracture, the surface of which was evaluated on the fracture surfaces, influences mechanical qualities of cast steel. Simultaneously, impacts of metallurgical factors on rate of conchoidal fracture were examined
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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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