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continuous casting method for steel

A casting mold and electromagnetic stirring technology, which is applied in the field of continuous casting steel, can solve the problem that pinhole defects have not completely disappeared, and achieve the effect of suppressing pinhole defects

Active Publication Date: 2017-10-27
NIPPON STEEL CORP
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Problems solved by technology

However, pinhole defects have not completely disappeared

Method used

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Embodiment Construction

[0046] In the present invention, the object of further suppressing pinhole defects is achieved by determining the optimum current frequency of the electromagnetic stirring device so as to minimize the electromagnetic repulsion force generated when the molten steel in the mold is electromagnetically stirred.

[0047] The inventors studied in detail the electromagnetic repulsion force generated in the mold when operating a continuous casting machine equipped with an electromagnetic stirring device in the mold, and found that pinhole defects can be reduced by suppressing the electromagnetic repulsion force.

[0048] Then, the inventors further studied the method of applying electromagnetic force to prevent Ar gas bubbles from approaching the vicinity of the solidification interface by suppressing the electromagnetic repulsive force. As a result, it became clear that there is an appropriate current frequency for applying electromagnetic force.

[0049] The mold and electromagnetic ...

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Abstract

A main object of the present invention is to provide a continuous casting method for steel in which pinhole defects are further suppressed. The present invention is a continuous casting method for steel, characterized in that the Lorentz force density component in the direction parallel to the long side of the casting mold (11) is applied to the iron as the structural element of the electromagnetic stirring device (13) The value obtained by averaging in the range where the core part (13a) exists is Lx (N / m3), and the Lorentz force density component in the direction parallel to the short side of the mold (11) is placed in the core core When the value obtained by averaging within the range where the part (13a) exists is Ly (N / m3), the effective Lorentz force density F (N / m3) is obtained by calculating F=Lx-α·Ly, and obtaining The relationship between the effective Lorentz force density F (N / m3) and the current frequency (Hz) of the electromagnetic stirring device (13) is obtained, using a method from the maximum value Fmax of the effective Lorentz force density F to 0.9Fmax The frequency of the electromagnetic stirring current is used for continuous casting of steel.

Description

technical field [0001] The present invention relates to a method for continuously casting steel by optimally operating an electromagnetic stirring device provided in a casting mold. Background technique [0002] A pinhole defect is mentioned as a factor which deteriorates the quality of the surface layer of the slab manufactured by continuous casting. This pinhole defect occurs because the Ar gas blown into the submerged nozzle to suppress the closing of the submerged nozzle during continuous casting enters the molten steel in the mold and is captured by the solidified shell. [0003] As a method of suppressing the above-mentioned pinhole defects, it is effective to install an electromagnetic stirring device in the mold. Examples of operating factors of the electromagnetic stirring device include molten steel flow rate, submerged nozzle, molten steel throughput, Lorentz force, and the like. [0004] As techniques for setting these manipulation factors within appropriate ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/115
CPCB22D11/115B22D11/16
Inventor 冈田信宏
Owner NIPPON STEEL CORP
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