The main problem in production of forgings from tool steels, especially in the form of thick plates, blocks, and rods which are used for special machine components for demanding applications, is the inhomogeneous structure with segregations, cracks in segregations or complex type of non-metallic inclusions of MnS and TiCN type. These forgings are actually produced from conventional forging ingots. Due to the size of forgings, it would be interesting to produce these forgings from slab ingots. It is possible that production of forgings from slab ingots (which are distinguished by a characteristic aspect ratio A / B) would reduce the occurrence of segregations. The paper presents the verification of the production process of slab steel ingots in particular by means of numerical modelling using finite element method. The paper describes the pre-processing, processing and post-processing phases of numerical modelling. The attention was focused on the prediction of behaviour of hot metal during the mould filling, on verification of the final porosity, of the final segregation and on prediction of risk of cracks depending on the actual geometry of the mould.Keywords: steel, slab ingot, macrosegregation, numerical modelling
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