scholarly journals Continuous Casting

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 643 ◽  
Author(s):  
Michael Vynnycky
Keyword(s):  
Continuous Casting ◽  
Molten Metal ◽  
Copper Alloys

Continuous casting is a process whereby molten metal is solidified into a semi-finished billet, bloom, or slab for subsequent rolling in finishing mills; it is the most frequently used process to cast not only steel, but also aluminum and copper alloys [...]

scholarly journals Production of three-layer steel bimetallic strips in the unit of continuous casting and deformation. Report 1

2019 ◽  
Vol 62 (8) ◽  
pp. 594-599 ◽  
Author(s):  
O. S. Lekhov ◽  
A. V. Mikhalev ◽  
M. M. Shevelev
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Continuous Casting ◽  
Molten Metal ◽  
Alloyed Steel ◽  
Combined Process ◽  
Stationary Heat ◽  
Cladding Layer ◽  
Characteristic Points ◽  
Stationary Heat Conduction

High technical and economic efficiency of the use of bimetals in chemical, oil, transport and energy engineering and other industries is described. The urgency of creating high-performance continuous processes for the production of bimetallic strips is substantiated. The authors have established the main technological tasks for development of the processes of obtaining bimetal of wide class. The paper describes resource-saving production technology of three-layer bimetals alloyed steel – constructional steel – alloyed steel at the unit of combined process of continuous casting and deformation. Possibilities of the proposed technology are outlined from the standpoint of improving the quality of bimetallic strips. The initial data are given to determine the temperature change over time of the main steel strip as it passes through the molten metal of the alloyed steel. The equations are given for non-stationary heat conduction, initial and boundary conditions for determining the temperature fields of main strip and cladding layer when obtaining a three-layer bimetallic strip on the unit of a combined process of continuous casting and deformation. The values of density, thermal conductivity and heat capacity for steel St3 were determined in a given temperature range. A procedure is described for calculating temperatures in the ANSYS package by solving a non-stationary heat conduction problem in a flat formulation by the finite element method. The authors have described the geometric model for calculating the temperature of strip and molten metal of the cladding layer. Values of the coefficient of heat transfer between the main strip and molten metal of the cladding layers of bimetallic strip are given adopted for calculation. Characteristic points are indicated in the model for calculating the temperatures of main strip and molten metal of the cladding layer. The graphs show temporal changes in these temperatures at production of a three-layer bimetallic strip on the unit of combined process of continuous casting and deformation. Calculated data on the time variation of temperature of main strip and molten metal of the cladding layer at characteristic points are given for different values of the contact heat transfer coefficient.

Effect of the Multi-Electromagnetic Fields on the Solidification Process of the Continuous Casting Hollow Billet

2012 ◽  
Vol 538-541 ◽  
pp. 1049-1052
Author(s):  
Qi Zhang ◽  
Jin Wang ◽  
Zhong Chu
Keyword(s):  
Electromagnetic Field ◽  
Continuous Casting ◽  
Molten Metal ◽  
Electromagnetic Fields ◽  
Solidification Process ◽  
Side Surface ◽  
Simulation Method ◽  
Outer Side ◽  
Billet Quality ◽  
Hollow Billet

In order to optimize the process parameters of continuous casting hollow billet with multi-electromagnetic fields, the solidification process of the continuous casting hollow billet was studied by the numerical simulation method, the results show that: 1) when only solenoid coil is imposed on outside of the outer-mold, it generates a lot of joule heat near the outer-side surface of hollow billet and leads to the uneven thickness of the solidified shell which is easily cause the crack defect. 2) when only traveling stirring electromagnetic field is imposed in the inside of the inner-mold, it can homogenize the temperature distribution of the molten metal and decrease the sump height, but it can also result in the uneven thickness of the solidified shell because of the nonuniform flow of molten metal. 3) when the above two kinds of electromagnetic field are applied simultaneously, the multi-electromagnetic fields can improve the homogeneous thickness of the solidified shell and decrease the sump height which is better for the high casting velocity and hollow billet quality.

How Material Properties Affect the Thermal Distortion of a Mold for Continuous Casting of Steel

2018 ◽  
Vol 774 ◽  
pp. 429-434
Author(s):  
L. Moro ◽  
J. Srnec Novak ◽  
D. Benasciutti ◽  
F. de Bona
Keyword(s):  
Continuous Casting ◽  
Material Properties ◽  
Operating Temperature ◽  
Copper Alloys ◽  
High Stress ◽  
Cyclic Plasticity ◽  
Thermal Distortion ◽  
Repeated Heating ◽  
Heating And Cooling ◽  
Initial Solidification

Copper molds are adopted in continuous casting to provide an initial solidification of steel. The presence of molten steel induces relevant temperature gradients across mold walls. This, in turn, generates high stress levels, exceeding the yielding limit of the material. Recent works confirm that thermal distortion occurs due to both creep and cyclic plasticity. In this work a numerical investigation is developed, simulating the mold behavior under repeated heating and cooling sequences. The aim of this work is to compare the performances in terms of permanent distortion of different copper alloys usually adopted for such application. It can be observed that both material properties and operating temperature have a significant influence in the permanent distortion evolution.

Defect Formation Mechanism and Influence of Processing Parameters on Surface Quality of Copper Clad Steel Composite Wires Prepared by Core-Cladding Continuous Casting

2017 ◽  
Vol 898 ◽  
pp. 1183-1189
Author(s):  
Wei Yu Wu ◽  
Xue Feng Liu ◽  
Feng Yi
Keyword(s):  
Continuous Casting ◽  
Surface Quality ◽  
Molten Metal ◽  
Surface Defects ◽  
Defect Formation ◽  
Formation Mechanisms ◽  
Core Diameter ◽  
Melt Temperature ◽  
Clad Steel ◽  
Composite Wires

Copper clad steel (CCS) composite wires with the carbon steel core diameter of 8 mm and copper cladding thickness of 1 mm were prepared by core-cladding continuous casting method under argon protection. The effects of melt temperature, molten metal height and drawing velocity on the surface quality were investigated. The formation mechanisms of the surface defects were discussed. The results showed that CCS wires with good surface quality could be continuously fabricated at a melt temperature of 1120 to 1200°C, a molten metal height of 2 to 4 cm and a drawing velocity of 10 to 30 mm/min. Raising the melt temperature, increasing the molten metal height or decreasing the drawing velocity is in favor of improvements in the surface quality. Insufficient supplement of liquid copper during solidification shrinkage resulted in surface dimple. Transverse hot cracking and exposed steel defect appeared because the frictional force between cladding metal and mold was larger than the tensile strength of cladding metal under high temperature.

scholarly journals Stages of technological improvement of the process of continuous casting of iron-carbon and copper billets

2020 ◽  
Vol 10 (2) ◽  
pp. 217-249
Author(s):  
Oleg Khoroshylov ◽  
Valentyna Kuryliak ◽  
Oleg Podoliak
Keyword(s):  
Mechanical Properties ◽  
Continuous Casting ◽  
Copper Alloys ◽  
Static Friction ◽  
Fourth Stage ◽  
Second Stage ◽  
Technological Improvement ◽  
Third Stage ◽  
Unstable Process

In the article there are presented the stages of improvement of the process of continuous casting. It is revealed, that at the each stage of technological improvement of the process of continuous casting, the damage parameters of billets were reduced. Improvement of the process of continuous casting leads to the improvement of the mechanical properties of the billets and the performance of continuous casting machines. The first stage is shown as the process of transition of the number of experimental developments into quality, during which the casting of billets passed from an unstable process to a stable one. The second stage is characterized by the creation of new improved continuous casting processes. So, besides the existing machines of the vertical type, radial, curvilinear and horizontal casting machines were invented. By the end of the twentieth century, this technological process reached the limit of the possibilities for increasing the quality of performs, and the productivity of continuous casting machines. It is shown that the third stage is intended for continuous casting of copper alloys and is based on the influence of the frequency of the movement of the billets and the reverse movement of the perform during overcoming the static friction force. It was determined that for the frequency of movement of billets made of copper alloys, which are in the range of 2.5...7.5 min-1, the direction of its movement during overcoming the static friction affects the mechanical properties of the billet. The fourth stage - causes an increase in the mechanical properties of the billet due to the use of inertia forces in the alternating movement of the billet. It was revealed that at the fourth stage the mechanical properties of the billets increased most effectively, and the linear performance increased from 0.4...0.8 to 2.5...4.0 m/min, and in some cases to 5.0...7.0 m/min.

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