The Stand of Horizontal Continuous Casting of Al and its Alloys

Abstract

In paper is presented idea of construction and influence of selected parts of stand of horizontal continuous casting on quality of pure Al and AlSi2 alloy ingots. The main parts of the made stand belong to induction furnace, which is also tundish, water cooled continuous casting mould, system of recooling, system of continuous ingot drawing and cutting. Mainly was considered influence of electromagnetic stirrer, which was placed in continuous casting mould on refinement of ingots structure. Effect of structure refinement obtained by influence of electromagnetic stirring was compared with refinement obtained by use of traditional inoculation, which consists in introducing of additives i.e. Ti and B to metal bath. The results of studies show possibility of effective refinement of Al and AlSi2 alloy primary structure, only with use of horizontal electromagnetic field and without necessity of application of inoculants. This method of inoculation is important, because inoculants decrease the degree of purity and electrical conductivity of pure aluminum and moreover are reason of point cracks formation during rolling of ingots.

The Role of Powder Used in the Continuous Molding of Alloys

“…The powder was tested on two continuous casting sequences: the first sequence at low speed (0.3 m / min) and the second sequence at medium speed (0.85 m / min) on a horizontal continuous casting installation of the alloys. [10,11,14,15] In the first sequence, at low speed, a batch of 150 Kg C 45E steel was poured continuously, and for the second sequence -with medium speed of continuous casting, a batch of 100 Kg S235JR steel was used, according to European standards.…”

“…It is considered that obtaining a good quality semifinished steel is determined by the way in which the casting powders fulfill the following roles: -ensuring a good thermal insulation at the surface of the steel in the crystallizer, in order to avoid its solidification [6]; -avoiding the oxidation of the steel in the crystallizer; -lubricating the contact surface between the molten steel and the crystallizer wall by maintaining a layer of liquid slag at the junction of the two metals as suggested in figure 2 [7][8][9][10][11][12][13][14][15]; -achieving a homogeneous transport from a thermal point of view, in accordance with the technological conditions and parameters, such as: casting speed, crystallizer size, steel mark, etc . ; -avoiding the incorporation of separate allogeneic materials in the steel crust by entraining them by the liquid slag.…”

The Influence of Casting Velocity on Structure of Al Continuous Ingots

“…The main parts of the made stand belong to induction furnace, which is also tundish with a capacity of up to 60 kg of charge, water cooled continuous casting mould at flow rate from 0.1 to 10l/min, system of recooling, system of continuous ingot drawing and cutting, which realized method of ingot movement defined by combination of motion to forwards, stop and/or backwards performed in specified time and velocity from 100 to 500 mm/ min set in control system. The characterization of this stand to horizontal continuous casting of Al and its alloys is presented in detail in papers [8,11].…”

The Properties of 7xxx Series Alloys Formed by Alloying Additions

“…In the as-cast state, from a practical point of view, aluminum alloys have a plastic and a soft matrix. With respect to composition, the aluminum alloys can be divided into we can distinguish casting alloys and alloys for plastic-processing [2,3,4].…”