Method and device for continuous casting of metal
A continuous casting and metal technology, which is applied in the field of continuous casting of metal and its devices, can solve the problems of increased flow rate of molten metal, large molten metal, flux involvement, etc.
Inactive Publication Date: 2006-06-07
JFE STEEL CORP
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Problems solved by technology
[0003] But, there is following problem in this method: when using static magnetic field to carry out braking (electromagnetic braking) to molten metal flow, molten metal easily produces segregation on stagnation position; When stirring (electromagnetic stirring) molten metal with moving magnetic field, Flux is easily entangled in the position where the flow rate is high (involved in flux)
[0005] However, no matter which method is used, the moving magnetic field will cause a large flow of molten metal, or the flow rate of molten metal will increase in the part where the static magnetic field is small, which cannot fully prevent the flux from being involved.
Method used
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[0055] Through the continuous casting machine, using the dipping nozzle, at the pouring speed of 4-5t / min, about 300t of ultra-low carbon aluminum-killed steel smelted by the converter-RH treatment process (the representative chemical composition is shown in Table 1) is poured into the mold When pouring, when casting a continuous casting slab with a width of 1500-1700mm and a thickness of 220mm, the figure 2 , image 3 , Figure 4 In any of the forms, the electromagnet is arranged on the position including the position corresponding to the surface of the molten metal in the mold, and the coils of the electromagnet are passed with three-phase alternating current or single-phase alternating current of various frequencies. Continuous casting experiments were carried out with a moving magnetic field with a maximum flux density of 0.1T, or three-phase, or a non-moving vibrating magnetic field, or no external magnetic field.
[0056] In this experiment, three items of surface seg...
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Provided is a metal continuous casting method in which a non-moving vibrating magnetic field is applied externally to molten metal in a casting mold so that the molten metal only vibrates, so that minimal flux entrainment and bubbles gathered near the surface can be obtained Continuous casting slab with minimal non-metallic inclusions and surface segregation. In addition, a metal continuous casting method is also provided, in which the continuous casting is performed while applying a static magnetic field in the thickness direction of the continuous casting, by intermittently applying the above static magnetic field, basic Continuous casting slabs without flux entrainment and surface segregation.
Description
technical field [0001] The invention relates to a continuous casting method and device for controlling the flow of molten steel by using a magnetic field in the continuous casting process of steel. Background technique [0002] In the continuous casting process, when the liquid metal (metal liquid) is poured into the mold, the dipping nozzle is often used. In this case, if the flow velocity on the surface of the molten metal is too high, the flux on the upper part of the molten metal will be involved; if the flow velocity on the surface of the molten metal is too small, the molten metal will tend to stagnate at its position and cause segregation. Finally, surface segregation is formed. The way to reduce this surface defect is to add a static magnetic field and (or) a moving magnetic field (AC moving magnetic field) to the molten metal in the mold to control the flow rate of the molten metal. [0003] But, there is following problem in this method: when using static magneti...
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IPC IPC(8): B22D11/115B22D11/00
CPCB22D11/115B22D11/00
Inventor 山根浩志别所永康三木祐司竹内秀次桐原理
Owner JFE STEEL CORP