Metallurgy and Foundry Engineering
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ISSN 1230-2325
e-ISSN: 2300-8377
Issue Date
2011
Volume
Vol. 37
Number
No. 2
Description
Journal Volume
Metallurgy and Foundry Engineering
Vol. 37 (2011)
Projects
Pages
Articles
Mechanisms knowledge of the flow and wear in the blast furnace crucible with the nodal wear model
(2011) González, Roberto; Barbés, Miguel A; Verdeja González, Luis Felipe; Duarte, Rámon M; Karbowniczek, Mirosław; Migas, Piotr; Ruiz Bustinza, Iñigo; Mochón Muñoz, Javier
The presence of thermocouples in the lining of crucibles has become a general practice in the new construction of blast furnaces. The Nodal Wear Model (NWM) has also emerged as an instrument that, while using experimental data, obtains nodal variables whose experimental measurement is not possible: global coefficient of pig-iron/refractory heat transfer [formula] and nodal temperature Ti. Starting from these nodal properties, the wear of the lining or the growth of scabs may be controlled, independently of the mechanisms responsible for them. In the same way, the properties and influence zone of the dead man in the hearth of the blast furnace may be calculated, along with those regions where the fluid is allowed to move without any other restrictions than the ones of the corresponding viscous flow (raceway hearth region).
New BOF slags containing sodium and manganese
(2011) Barbés Fernández, Maria Florentina; García, Érika Marinas; Verdeja González, Luis Felipe; Carcedo, Fernando García; Ruiz Bustinza, Iñigo; Karbowniczek, Mirosław; Migas, Piotr
The nature and properties of slag and dust generated during the manufacture of pig iron indicate the two possibilities of their utilization: sintering or cold agglomerating with Portland cement. Both sinter and pellets can be recycled in the LD converter. It was introduced the concept of 'preformed synthetic slag' to use the recycling of waste. If the material contains components forming the eutectic properties similar to sinter or pellet (obtained outside the converter) it stimulates the creation of slag in the LD converter.The aim of this research is to address the best way to deal with manganese before the molten metal reaches the final stage of temperature and composition for casting. Ideally, the composition of the slag and dust produced by the BOF-LD can be adjusted so that the molten metal that reaches the secondary metallurgy contains over 1.0% manganese.
Numerical modelling of non-metallic inclusions size distribution during liquid steel flow through a continuous casting slab tundish
(2011) Cwudziński, Adam; Jowsa, Jan
The article presents the results of computer simulations of non-metallic inclusions behaviour in a slab tundish. The tundish is equipped with a dam with two holes. The authors employed the CFD (Computational Fluid Dynamics) numerical modeling technique to demonstrate changing process of non-metallic inclusions size distribution. The computer simulations were performed for non-isothermal and non-steady conditions of continuous steel casting process. As a result of computations, time characteristics of changing volume fraction for particular group of non-metallic inclusions were obtained.
Closed die forging of turbine disc to fix blades from Inconel$^®$718
(2011) Chyła, Piotr; Łukaszek-Sołek, Aneta; Bednarek, Sylwia; Chyła, Paweł
In the paper numerical analysis of closed-die forging process of turbine disc to fix blades was presented. Forging technologies which take into account conventional and isothermal boundary conditions were analysed. Forging processes were lead as one stage or as two stages - with initial upsetting. In the analysis additional influence of lubrication conditions on the process parameters was taken into account.
Simplified method of heat calculations of oil-air heat exchangers
(2011) Karczewski, Krzysztof
On an experimental post exploiting parameters of oil-air heat exchanger, made of aluminium pipes, with cross-circular fines were identificated. Simplified method of calculations of oil-air heat exchangers was elaborated. The method includes: heat transfer ratio, mean temperaturę difference, finning ratio, over-all heat transfer coefficient, convective heat transfer coefficients on oil and air sides. The calculation results were compared with ones by Mean Temperature Difference method.