scholarly journals The Stand of Horizontal Continuous Casting of Al and its Alloys

2013 ◽  
Vol 13 (3) ◽  
pp. 113-118 ◽  
Author(s):  
T. Wróbel ◽  
J. Szajnar ◽  
D. Bartocha ◽  
M. Stawarz
Keyword(s):  
Continuous Casting ◽  
Induction Furnace ◽  
Structure Refinement ◽  
Pure Aluminum ◽  
Electromagnetic Stirring ◽  
Metal Bath ◽  
Horizontal Continuous Casting ◽  
Continuous Ingot ◽  
Continuous Casting Mould

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.

scholarly journals Structure and Usable Properties of Aluminum Continuous Ingots

2015 ◽  
Vol 15 (3) ◽  
pp. 85-90
Author(s):  
T. Wróbel ◽  
J. Szajnar ◽  
D. Bartocha ◽  
M. Stawarz
Keyword(s):  
Plastic Deformation ◽  
Continuous Casting ◽  
Structure Refinement ◽  
Electromagnetic Stirring ◽  
Metal Bath ◽  
Deformation Effect ◽  
Horizontal Continuous Casting ◽  
Continuous Casting Mould ◽  
Effect Of Structure

Abstract In paper is presented results of studies concerning ingot of Al with a purity of 99.5% cast with use of stand of horizontal continuous casting. Mainly together with casting velocity was considered influence of electromagnetic stirrer, which was placed in continuous casting mould on refinement of ingots structure and theirs usability to plastic deformation. Effect of structure refinement and usability to plastic deformation 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. On the basis of obtained results was affirmed that inoculation realized by electromagnetic stirring in range of continuous casting mould guarantees improvement in structure refinement and usability to rolling of pure Al continuous ingots.

scholarly journals Primary Structure and Mechanical Properties of AlSi2 Alloy Continuous Ingots

2017 ◽  
Vol 17 (2) ◽  
pp. 145-150
Author(s):  
T. Wróbel ◽  
J. Szajnar ◽  
D. Bartocha ◽  
M. Stawarz
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Yield Strength ◽  
Continuous Casting ◽  
Primary Structure ◽  
Structure Refinement ◽  
Negative Influence ◽  
Electromagnetic Stirring ◽  
Metal Bath ◽  
Continuous Casting Mould

AbstractThe paper presents the research results of horizontal continuous casting of ingots of aluminium alloy containing 2% wt. silicon (AlSi2). Together with the casting velocity (velocity of ingot movement) we considered the influence of electromagnetic stirring in the area of the continuous casting mould on refinement of the ingot’s primary structure and their selected mechanical properties, i.e. tensile strength, yield strength, hardness and elongation. The effect of primary structure refinement and mechanical properties obtained by electromagnetic stirring was compared with refinement obtained by using traditional inoculation, which consists in introducing additives, i.e. Ti, B and Sr, to the metal bath. On the basis of the obtained results we confirmed that inoculation done by electromagnetic stirring in the range of the continuous casting mould guarantees improved mechanical properties and also decreases the negative influence of casting velocity, thus increasing the structure of AlSi2 continuous ingots.

scholarly journals Influence of Selected Parameters of Continuous Casting in the Electromagnetic Field on the Distribution of Graphite and Properties of Grey Cast Iron

2014 ◽  
Vol 59 (2) ◽  
pp. 747-751 ◽  
Author(s):  
J. Szajnar ◽  
M. Stawarz ◽  
T. Wróbel ◽  
W. Sebzda
Keyword(s):  
Electromagnetic Field ◽  
Cast Iron ◽  
Continuous Casting ◽  
Grey Cast Iron ◽  
Flake Graphite ◽  
Continuous Ingot ◽  
Grey Cast ◽  
Continuous Casting Mould ◽  
Selection Of

Abstract In paper problem concerning modification of grey cast iron EN-GJL-200 Grade, which is realized mainly by intensification of liquid metal movement in horizontal continuous casting mould containing electromagnetic stirrer is presented. The range of studies contains influence of electromagnetic field on morphology of graphite and usable properties i.e. tensile strength, hardness and machinability. Moreover the influence of velocity of ingot pulling on microstructure was analyzed. The results of studies and their analysis show possibility of improvement in quality of grey cast iron continuous ingot firstly in result of elimination of hard spots in structure by properly selection of velocity of ingot pulling and second in result of unification of size, shape and distribution of flake graphite by application of electromagnetic field.

Designing of a Novel Shroud for Improving the Quality of Steel in Tundish

2012 ◽  
Vol 585 ◽  
pp. 359-363 ◽  
Author(s):  
Debasish Chatterjee
Keyword(s):  
Continuous Casting ◽  
Continuous Casting Machine ◽  
Casting Machine ◽  
Steel Production ◽  
Metal Bath ◽  
Ladle Slag ◽  
Exchange Operation ◽  
Slag Entrainment ◽  
Steel Flow

In present 92.8% of world steel production is casted on continuous casting machine. The key phase of continuous casting is tundish. Beside of refining effect of slag phase also steel flow in tundish is very important factor. The main causes for inclusion formation and contamination of the melt include reoxidation of the melt by air and carried over oxidizing ladle slag, entrainment of tundish and ladle slag, and emulsification of these slags into the melt. These causes are due to generation of turbulence in the melt. Although turbo stop lowers the turbulence in some extent. But it is not capable of totally decrease of turbulence specially during lowering of metal bath at the time of ladle exchange operation, cause contamination of the steel melt in tundish. So in the present work it has been focused to develop a novel shroud which have significant role to supply of steel from ladle to tundish at slow rate to avoid turbulence, emulsification and formation of slag eye in tundish to produce quality steel in a sustained manner.

The Influence of Electromagnetic Stirring on Primary Structure of Pure Al and Al-Si Alloy

2013 ◽  
Vol 746 ◽  
pp. 478-483
Author(s):  
Tomasz Wróbel
Keyword(s):  
Electromagnetic Field ◽  
Liquid Metal ◽  
Primary Structure ◽  
Transverse Section ◽  
Structure Refinement ◽  
Electromagnetic Stirring ◽  
Metal Bath ◽  
Average Area ◽  
Elevated Frequency ◽  
Forced Movement

In paper problem concerning inoculation of primary structure of Al with purity of 99,5% and 99,8% and AlSi2 alloy, which is realized mainly by intensification of liquid metal movement in mould is presented. In aim of realization of forced movement during the crystallization of liquid metal was used horizontal electromagnetic field produced by the induction coil (stirrer) supplied by current with elevated frequency. The degree of structure refinement was represented mainly by equiaxed crystals zone content on transverse section of ingot and average area of macro-grain in this zone. 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. titanium, boron and strontium to metal bath. The results of studies and their analysis show possibility of effective refinement of pure Al and Al-Si alloy primary structure, only with use of horizontal electromagnetic field and without necessity of application of inoculants such a Ti and B. This method of inoculation is important, because inoculants decrease the degree of purity and electrical conductivity of pure Al. Moreover inoculants are reason of point cracks formation during rolling of ingots.

Preparation and Fundamental Research of Continuous Through-Porous Pure Aluminum Flat Pipes by Depoling Continuous Casting

2017 ◽  
Vol 898 ◽  
pp. 1220-1230
Author(s):  
Tao Zhang ◽  
Xue Feng Liu ◽  
Shan Shan Kong ◽  
Jia Jie Fan ◽  
Zhen Di Zhang
Keyword(s):  
Surface Roughness ◽  
Continuous Casting ◽  
Pure Aluminum ◽  
Cooling Water ◽  
Mold Temperature ◽  
Fundamental Research ◽  
Core Rod ◽  
And Control ◽  
Measurement And Control

Continuous through-porous pure aluminum flat pipes were prepared continuously by a self-developed depoling continuous casting technology. An online measurement and control of mold temperature at free end of graphite core rods was realized, which was critical for the preparation. The quality of flat pipes was characterized. The results show that the flat pipes could be successfully prepared with the following process parameters: melt with temperature of 750 °C, cooling water with temperature of 20 °C and flow volume of 400 L·h-1, heat insulating mattress with thickness of 2 mm, mold temperature ranged from 635°C to 655°C and continuous casting speed ranged from 1 mm∙min-1 to 4 mm∙min-1. The flat pipe had cross-section dimensions of 14 mm×5 mm, which was aligned unidirectional pore diameter of 3 mm, pore number of 3 and smooth internal and external surface. The pore surfaces of flat pipes became smoother with the reduction of the graphite core rod surface roughness. When the surface roughness of graphite core rods was 0.531 μm and 0.124 μm, the corresponding surface roughness of pores was 0.581 μm and 0.184 μm, respectively. The mold temperature at the free end of graphite core rods was kept at a low thermal temperature range which was 5~25 °C lower than the solidification point of pure aluminum that is necessary for stable depoling continuous casting.

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