TREND AND APPLICATION OF MODERN METHODS IN INGOT CASTING
4. TECHNICAL & TECHNOLOGICAL CARACTERISTICS OF INGOT CASTING FACILITY
To achieve technological proces for ingot casting, and also introduction of modern way of ingot
casting in ArcelorMittal Zenica was instaled production line with following equipment: facility for
vacuum degasing, VD tank with cover, car for transfer VD tank cover, Ladle transfer and casting,
bridge crane, mold for ingot casting with auxiliaries, casting pit, stand for mold preparation, bench for
mold preheating, air mail and main control room with devices for controls and measurements. Unlike
previous ingot casting cocncepts in this case steel is casted to molds from casting ladle are placed on
car, while molds and auxiliary are placed in casting pit bellow a car. This improvement provide more
flexibility during production.
Main parameters of facilities are:
- annual production 50.000 tons
- weight of ingots from 15 tons up to 40 tons
- weight of hot metal in ladle 110 tons
- dimension of halls 48x24x24,5m.
Planned underpressure in vacuum tank is about 200 mbars. Vacum degasing tank was made from boiler steel
sheet and welded construction. Internal diameter of tank is 5.950mm and height 5.790mm.
Inner side of vacuum tank is lined with refractory material. Ladle transfer car is used for transport of
steel ladle and also for casting of steel from ladle to the mold. Dimension of ladle transfer car is
9,9x5,1x1,5m, and speed of car movement is 0–30m/min. Maximal stroke of car motion is 30m.
Molds for ingot casting are with different capacities from 15 tons up to 40 tons. The molds with
auxiliary are placed in casting pit. Moreover in halls is instaled bridge crane for ingots striping and
transport of ingots to next phase of processing.
5. CONCLUSION
According to the analyses given in chapters above following conclusions regarding modern method in
ingot casting are:
Casting into ingots is complex metallurgical opeartion.It can be divided into two operations:
vacuuming and degassation in first phase and ingot casting,
With vacuuming and degassation it is possible reduce hydrogen and nitrogen content in molten
steel. Reduction of hydrogen content from 0,0007 na 0,0001 mass % can be done in ten minutes
time. Current figures are given in diagrams, figure 2 and 3.
Casting into ingots have been done till today with crane holding the ladle with liqued steel. This
practice had a lot of problems. In this presentation is described how to cast from ladle into ingots
placed on casting car.
To realise casting described in text above it was neccessery to install required equipment for that
opeartion. Technical and technological characteristic installed equipment are given in chapter 4.
Probablly this method in ingot casting will be more and more in metallurgical practice.
Installed equipment enable more flexibillity in metallurgical operation.
PDF:
http://www.tmt.unze.ba/zbornik/TMT2009/ ... 09-200.pdf
Projektovanje i izvođenje građevinskih radova.
Konstrukcija hale livnice ingota je raspona 24m i visine 23.30m, u nastavku postojeće hale- čeličane. Noseća konstrukcija obuhvata temeljne stope i grede, čelične stubove – glavne i fasadne, glavne krovne rešetkaste nosače, čelične rešetkaste rožnjače, spregove za ukrućenje i sistem fasadnih nosača obloge. Glavni stubovi su izvedeni kao rešetkasti stubovi promenljivog poprečnog preseka, a glavni krovni nosači su rešetkasti autostabilni nosači raspona 25.00 m, statičke visine 2.5 m u sredini raspona. Površina i visina hale određeni su tehnološkim procesom proizvodnje zbog koga su unutar hale izvedeni nosači kranske staze za mostnu dizalicu raspona 24m i nosivosti 70t. Na rožnjačama su ovešani i nosači monorej dizalice sa gornjom ivicom na 20m. Unutar hale su izrađeni temelji za opremu pogona za livenje ingota.
Investitor:
Arcelor Mittal
Lokacija:
Zenica, BiH
Površina:
965m2
Početak:
06.11.2008
Kraj:
06.03.2009
Status:
Završen