continuous casting method for steel
A technology for casting steel and casting molds, which is applied in the field of continuous casting steel to achieve the effect of suppressing leakage and stabilizing operation.
Active Publication Date: 2011-12-07
NIPPON STEEL CORP
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Problems solved by technology
[0009] The dual-purpose coils proposed in these patent documents 1 and 2 make it possible to combine electromagnetic braking and electromagnetic stirring, which were impossible in the past.
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[0022] In the following, the best mode for implementing the present invention will be used together with the process from the idea of the present invention to solving the problem. figure 1 Be explained.
[0023] When continuously casting steel using the dual-purpose coil of Patent Document 2, the inventors studied how electromagnetic braking or electromagnetic stirring should be selectively performed with respect to casting conditions.
[0024] The electromagnetic brake has the effects of alleviating longitudinal cracks caused by uneven solidification, suppressing re-melting of the solidified shell, and suppressing the occurrence of leaks. The reason is that the flow rate of the molten steel sprayed from the submerged nozzle is reduced, and the flow rate of the molten steel that hits the solidified shell is reduced.
[0025] On the other hand, electromagnetic stirring increases the flow rate of molten steel under the meniscus by applying a molten steel flow parallel to the solidif...
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Abstract
The invention provides a continuous casting method for steel. It embodies the method of applying current to the dual-purpose coil, and the outer circumference of each long side (3b) of the mold (3) is the same number of each long side and the outer circumference of the long side (3b) totals (2n+2) (n is a natural number), and the electromagnetic coil has two excitation coils (5b) wound around the outer circumferences of the two pole cores (5a) and a combined coil wound around the two pole cores (5a). 1 excitation coil (5c) of the outer peripheral part that rises. In the case of electromagnetic stirring, a three-phase or more multiphase alternating current having a current phase difference of 90 to 120 degrees is supplied to each exciting coil (5b, 5c) of all the electromagnetic coils. In the case of electromagnetic braking, steel is continuously cast by passing direct current through the excitation coil (5c) or the three excitation coils (5b, 5c) wound around the electromagnetic coils. Electromagnetic braking or electromagnetic stirring is selectively performed according to the composition and supply amount of molten steel (2) supplied to the mold (3). Even if the type of steel and the casting conditions change, a cast slab with good surface quality can be obtained, and the occurrence of breakout can be suppressed, so that the most stable operation can be performed.
Description
Technical field [0001] The present invention relates to a method of continuously casting steel while controlling the flow of molten steel in a mold using an electromagnetic coil device capable of selectively performing electromagnetic braking or electromagnetic stirring. Background technique [0002] In a normal continuous casting process of steel, a submerged nozzle with two ejection holes is used to supply molten steel into the mold. figure 2 It is a longitudinal cross-sectional view schematically showing the flow state of molten steel in the mold in this normal continuous casting method. The molten steel 2 sprayed from the spray hole 1a of the submerged nozzle 1 collides with the solidified shell 2c on the short side 3a of the mold 3 and then branches into an upward flow 2a and a downward flow 2b. The upward flow 2a therein turns into a horizontal flow toward the submerged nozzle 1 under the meniscus. In addition, figure 2 Reference numeral 4 in represents mold powder. [0003...
Claims
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IPC IPC(8): B22D11/115B22D11/11B22D11/04B22D11/18
CPCB22D11/115B22D11/04B22D11/11B22D11/18
Inventor 川本正幸冈田信宏花尾方史高谷幸司太田晃三
Owner NIPPON STEEL CORP