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Friday, November 27, 2020 | History

2 edition of In-mold electromagnetic stirrer for continuous casting. found in the catalog.

In-mold electromagnetic stirrer for continuous casting.

Maochang Cao

In-mold electromagnetic stirrer for continuous casting.

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Published .
Written in English


The Physical Object
Pagination157 leaves
Number of Pages157
ID Numbers
Open LibraryOL17506936M

Improvement of In-mold Electromagnetic Stirrer by Feeding of Magnetic System with Polyharmonic Current. The elaboration relates to a method of electromagnetic stirring in continuous casting of carbon steels, when the surface quality and entrapping of nonmetallic inclusions still remain as the major problems concerning of ingot quality and. If the address matches an existing account you will receive an email with instructions to reset your password. Quality problems in continuous casting of steel can be identified as they occur by monitoring mold signals (level sensor, thermocouples in the mold walls, friction etc.) and taking appropriate action (such as slowing casting speed, changing taper, changing a clogged nozzle, or later visual inspection of the surface for possible downgrading.


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In-mold electromagnetic stirrer for continuous casting. by Maochang Cao Download PDF EPUB FB2

The mixing induced with the electromagnetic stirrers makes the heat exchange along the casting line more effective, consequently the solidification process is more homogeneous and promotes the formation of equiaxed zones.

Electromagnetic stirrer are user in continuous casting processes, mainly to increase the quality and the production of steel. During the continuous casting process of a steel mill, guided electromagnetic forces that are generated from the in-mold electromagnetic stirrer (M-EMS) systems are.

In-mold electromagnetic stirring in continuous casting Abstract: To get the optimal operation of in-mold electromagnetic stirring through the fundamental characteristics, a three-dimensional magnetohydrodynamic calculation model was used, taking into consideration heat transfer and solidification as well as free surface.

The aim of present investigation has been to study the effect of stirrer position on the continuous casting mold by analyzing the changes in fluid flow and solidification behavior in the billet caster mold.

Coupled three-dimensional model of solidification and in-mold electromagnetic stirring was simulated by changing the position of by: In-mould electromagnetic stirring (M-EMS) is a widely used technique during slab continuous casting.

To investigate the effect of M-EMS on the flow and initial solidification in a slab mould, a. A computational study of the effect of stirrer position on fluid flow and solidification in a continuous casting billet mold with in-mold electromagnetic stirring has been carried out.

The numerical investigation uses a full coupling method in which alternating magnetic field equations are solved simultaneously with the governing equations of Cited by:   The stirrer design, size and position etc.

depend on the continuous casting machine data, the steel grades to be produced and the casting parameters. Electromagnetic melt stirring systems create a rotating magnetic induction field with an induction of B, which induces eddy current j in a direction perpendicular to B, whose velocity is v.

EMBr (ElectroMagnetic Brake) and in-mold EMS (ElectroMagnetic Stirring) have been developed to control molten steel flow in a continuous casting mold. EMBr is able to stabilize the molten flow in.

electromagnetic in-mold stirring that allows to satisfy the above-mentioned In-mold electromagnetic stirrer for continuous casting. book, following the principle of minimum changes in conventional, very rational caster.

As example of the in-mold electromagnetic asynchronous stir-rer in-mold stirrer for bloom caster mm was taken in consideration. The mathematical two- and three-dimen. A computational study of the effect of stirrer position on fluid flow and solidification in a continuous casting billet mold with in-mold electromagnetic stirring has been carried out.

The application of magnetohydrodynamics (MHD) in the continuous casting process of steel has now advanced to electromagnetic stirring in the mold and the control of molten steel flow by an in-mold direct-current (DC) magnetic field brake. These applied MHD In-mold electromagnetic stirrer for continuous casting.

book are designed to improve further the continuous casting (CC) process capability. Electromagnetic stirring is widely used in continuous casting of steel as a means to improve homogeneity of cast slabs. Industrial experience has shown that stirrer design and operating conditions have a strong influence on the metallurgical quality of the cast slab.

This paper examines the effect of the stirrer current and field frequency on the. In magnetohydrodynamic (MHD) stirring process, electromagnetic stirring is used to break the dendrites present in semisolid state.

In this technique, local shear is generated by rotating electromagnetic fields within the continuous casting mold, and continuous billets of.

Recently rotary electromagnetic stirring has been applied to continuous casting steel, molding and solidifying of casting, and purifying of liquid melt, which has been more attractive to professionals in materials field.

Successful fruits in both technology development and theoretical study have been achieved. Electromagnetic stirring (EMS) of.

A method and an apparatus are provided for electromagnetic stirring during a continuous casting process, especially for casting a billet and bloom of medium and high carbon steels. The method and apparatus provide a higher surface quality of the ingot, reduce the entrapping of nonmetallic inclusions into the ingot, and suppress issues regarding central segregation and central by: The purpose of present investigation is to analyze the in-mold electromagnetic stirring (M-EMS) process and the effect of stirrer frequency on fluid flow and solidification in a continuous casting billet caster mold.,A hybrid approach involving finite element and finite volume method has been used for the study.

Finite element model is used to calculate time variable magnetic field, which is Cited by: 3. electromagnetic stirring on a commercial continuous casting machine was a rotative strand stirrer in on the mm square bloom caster of SAFE (now Ascométal) at Hagondange in France.

During the following years, the same partners developed mold and strand stirring of slabs and mold stirring of billets/blooms.

The latter appeared. For the limiting case of one-dimensional stirring, the computations were checked with experiments using mercury as the fluid. Several sets of computations were carried out to determine the influence of stirrer position, stirrer length, and electromagnetic parameters on the flow field in continuous casting of steel by: In-mold electromagnetic stirring (M-EMS) is a widely used technique for improving the quality of the billet and bloom in the continuous casting process.

The electromag-netic force generated in the mold tends to put the molten steel into rotation. By controlling the M-EMS current and frequency, stirring intensity in the liquid pool can be con.

To improve the production qualities of a steel mill, an in-mold electromagnetic stirrer (M-EMS) is generally implemented at the continuous casting process to provide the desired stirring forces to the molten steel.

As the system is mainly operated by the interactions of induced eddy currents and the traveling electromagnetic fields in the molten steel, compositions of the stator winding. connected with the fact that electromagnetic stirring increases the intensity of internal heat transfer in the metal bath in the mold.

Conclusions The study shows that electromagnetic stirring in the CCM mold can significantly increase the mass of solidified metal, what improves the speed of continuous casting in %. References 1. Maximizing product quality, productivity and profitability with a complete range of solutions for slab casting Our products are developed in close collaboration with industry partners.

This, to make sure that we focus our unique expertise and unparalleled experience on designing products that help overcome the challenges facing your business. In-mold electromagnetic stirring in continuous casting Abstract: To obtain the optimal operation of in-mold electromagnetic stirring (EMS) through the fundamental characteristics, the author developed a 3-D magnetohydrodynamic calculation model, taking into consideration heat transfer and solidification as well as free surface.

A coupled numerical simulation of magnetic field and flow field was conducted basing on Φmm bloom during continuous casting with electromagnetic distribution of the flow field was analyzed in different current and the same current,the velocity first decrease and then increase as the frequency increase along the casting the same frequency, tangential.

The electromagnetic stirrers are used in the continuous casting process to improve the product quality and to increase the steel production. According to the position along the casting strand and metallurgical effects, stirrers can be classified mould, strand and final stirrers.

For the mm × mm bloom continuous cast- ing of bearing steel, the appropriate value of current intensity of electromagnetic stirring was found to be A. Key words: bearing steel, bloom, continuous casting, electromagnetic stirring, solidification structure. This paper reviews the history of commercial electromagnetic stirring devices used to control the solidification structures of continuously cast products.

Besides the theoretical advantages of EMS, the implementation of rotary- and axial-type stirring equipment can also pose serious technical difficulties. Metallurgical problems include convective macrosegregation, bridging, and centrifuging.

effects of double-axis electromagnetic stirring (DAEMS) in continuous casting process, which is composed of a rotational electromagnetic stirrer and a vertical electromagnetic stirrer, using unsteady 3-D hydrodynamic calculation of the molten gallium model. Though in-mold electromagnetic stirring (M-EMS) is effective to.

The electromagnetic stirrer utilizes the principle of a linear motor and differs from the conventional mechanical and decompression types as it is a noncontact stirrer in which no part touches the molten metal.

As shown in the diagram, a coil installed at the bottom of the furnace generates a moving magnetic field (H) if a 3 phase AC voltage is. Numerical model of electromagnetic stirring for continuous casting billets Abstract: This paper introduces a numerical model of an electromagnetic rotary stirrer based on the finite-element model.

Such stirrers are used to improve the quality of continuously cast steel, particularly billets and blooms. Continuous Casting: The Application of Electromagnetic Stirring (Ems in the Continuous Casting of Steel) by J.

Moore (Editor) ISBN Mould Electromagnetic Stirrer Configuration: Electromagnetic Stirrer (EMS) is regularly used on CCM(continuous casting machine of bloom/billet),installed in the mould, strand or final. Most EMS are installed outside or inside the mould, which depends on the conditions of your casters. Customerized adjustment that you can use.

Abstract: The continuous casting (CC) process is a crucial factor in determining quality of steel slabs, therefore directly affecting the scrap percentage and manufacturing costs. By braking or accelerating the liquid steel in the casting mould with the electromagnetic stirring (EMS) technique, the flow speed can remain in an optimal range in terms of slab quality.

This paper presents the experimental study of an electromagnetically stirred mould flow using a scale acrylic glass model of the round bloom caster from voestalpine Stahl Donawitz GmbH. An electromagnetic stirrer was installed at the strand producing a rotating magnetic field (RMF).

Abstract—Industrial continuous casting machines in Russia mainly employ imported electromagnetic-stirring systems located outside the mold. In case of breakage, the stators of such stirreres must be sent back to the manufacturer for repair. To decrease import dependence, an electromagnetic-stirring system that may be completely dismantled has been developed at the Russian Research Institute.

HTML 1. Introduction. The in-mold electromagnetic stirring (M-EMS) is one of the effective technical means to refine the solidification structure, enlarge the equiaxed crystal zone, and improve the center segregation of casting strands [1 ‒ 4]; however, the use of M-EMS will also produce a negative segregation band under the bloom surface [5 ‒ 8].

Abstract. Coupling macroscale heat transfer and fluid flow with microscale grain nucleation and crystal growth, a mixed columnar-equiaxed solidification model was established to study the SWRT82B steel solidification structure and macrosegregation in mm × mm billet continuous casting with dual electromagnetic stirrings in mold and final stage of solidification (M-EMS and F-EMS).

In-mould electromagnetic stirring (M-EMS) is a widely used technique during slab continuous casting. To investigate the effect of M-EMS on the flow and initial solidification in a slab mould, a three-dimensional model coupling electromagnetic field, flow and solidification was developed.

Electromagnetic stirring (EMS) has been used in the continuous casting of steel[] since as early as the s as a way to control solidification structures, thereby increasing yield and tandem, mathematical modeling has played an important role in the implementation of EMS, as regards providing understanding of exactly what effect stirring has.

An electromagnetic stirring process for continuous casting is presented. According to the present invention, coils of inductors are supplied with a multiphase current so as to create in a molten metal at least one primary rotational movement zone which is offset with respect to a central casting axis.

This primary rotational movement zone is also revolved in a secondary gyratory movement. The electromagnetic stirrer is fixed at mm below the mold top, and the height of electromagnetic coil is mm.

The axle and A-A section cutaway view of mold with electromagnetic stirrer are shown in Fig. 1 (a) and (b), respectively, and a typical finite element mesh for the model is .The in-mold electromagnetic stirring (M-EMS) is one of the effective technical means to refine the solidification structure, enlarge the equiaxed crystal zone, and improve the center segregation of casting strands [1‒4]; however, the use of M-EMS will also produce a negative segregation band un-der the bloom surface [5‒8].The multiple versions of electromagnetic stirring in continuous casting are described.

For long products, linear or rotational stirring appears confusing, but is clarified based on liquid steel flow pattern and metallurgical results. Rotational mould stirring is the predominant application in billet casting.