Method for casting molten metal, apparatus for the same, and cast slab
a technology of molten metal and casting slab, which is applied in the direction of thin material processing, transportation and packaging, etc., can solve the problems of increased surface velocity of molten steel in the mold, defect on the surface of product, and inability to achieve the equal axed crystal ratio by which a sufficiently high quality of product can be produced
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example 1
[0103] In this example, in order to make clear the influence, of a vibration pattern which is generated by an electromagnetic coil, on the equi-axed crystal ratio and the grain size of equi-axed crystals, an experiment was made in which molten steel was poured into a mold having an electromagnetic coil, the frequency of which was 10 Hz. In this experiment, molten steel of 50 kg, the carbon content of which was 0.35%, was melted in a high frequency melting furnace and poured into a mold made of copper, wherein the width of the mold was 200 mm, the length was 100 mm and the height was 300 mm. Immediately after the molten steel had been poured into the mold, the molten steel was solidified while it was being vibrated in the mold by a predetermined vibrating pattern. After the completion of casting, the ingot was cut on a lateral section, so that the solidified structure was revealed outside. Then, an area ratio of an equi-axed crystal region (an equi-axed crystal area ratio) and a diam...
example 2
[0108] In this example, a two-strand type continuous casting machine for continuously casting billets was used, and cast billets of 120 mm square made of carbon steel, the carbon content of which was 0.35%, were cast for 30 minutes at the casting speed of 1.2 m / min. Temperature in a tundish was 1530.degree. C. In one of the strands, conventional electromagnetic stirring was generated, in which the coil current of the electromagnetic stirring device was set at a constant value of 200 ampere and the frequency was set at 10 Hz, for 30 minutes at the flow velocity of 60 cm / s. In the other strand, an electromagnetic coil of the present invention capable of giving vibration was arranged in the mold, and molten steel on the front solidified shell was vibrated under the following conditions. Vibration time of one period of the coil current was 2 s (the maximum coil current was 200 ampere, the minimum coil current was -200 ampere, the coil current increasing time was 0.8 s, the coil current ...
example 3
[0110] In this example, a two-strand type continuous casting machine for continuously casting slabs was used, and cast pieces of 250 mm thickness.times.1500 mm width made of carbon steel, the carbon content of which was 0.35%, were cast for 30 minutes at the casting speed of 1.8 m / min. Temperature in a tundish was 1550.degree. C. In one of the strands, a conventional electromagnetic stirring was generated, in which the coil current of the electromagnetic stirring device was set at a constant value of 500 ampere and the frequency was set at 2 Hz, for 30 minutes at the flow velocity of 60 cm / s. In the other strand, an electromagnetic coil of the present invention capable of giving stirring was arranged in the mold. For 15 minutes in the first half of casting, molten steel on the front face of solidification was vibrated under the following conditions. Vibrating time of one period of the coil current was 2 s (the maximum coil current was 400 ampere, the minimum coil current was -400 am...
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Abstract
Description
Claims
Application Information
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