Continuous casting method for slab
A technology for casting billets and casting machines, which is applied in the direction of metal rolling, etc., can solve the problems of reduced reduction efficiency and a large amount of equipment investment, and achieve the effect of reducing equipment costs.
Active Publication Date: 2016-12-14
NIPPON STEEL CORP
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Problems solved by technology
[0004] However, in the technique described in Patent Document 1, since the reduction is performed outside the continuous casting machine, the reduction efficiency decreases as the surface temperature of the slab decreases.
Therefore, it is necessary to ensure the pressing force, and a large investment in equipment is required
Method used
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Embodiment
[0062] In order to confirm the effect of the continuous casting method of the cast slab of the present invention, the following continuous casting tests were performed and the results were evaluated.
[0063] As a continuous casting machine, the Figure 1 to Figure 5 Continuous casting machine of the vertical bending type is shown. The slab after continuous casting was formed of steel having a C content of 0.16% by mass, and had a thickness of 280 mm to 300 mm and a width of 2300 mm. The casting speed is set at 0.58m / min to 0.80m / min. The secondary cooling is carried out under the condition that the specific water volume is 0.78L / kg-steel~0.94L / kg-steel.
[0064] The first large-diameter reduction roll is arranged at a position 21.2 m downstream from the molten steel surface in the mold along the casting direction, and the second large-diameter reduction roll is arranged at a position 27.0 m away from the molten steel surface in the mold along the casting direction. downstr...
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The principal purpose of the present invention is to provide a continuous casting method by which it is possible to reduce a slab within a continuous casting machine, as well as to continuously cast a slab of good internal quality despite fluctuations in casting speed. The present invention is a slab casting method in which a continuous casting machine equipped with pairs of reduction rolls that are arranged in two stages along the casting direction, and that each have a diameter 1.2-2.0 times the thickness of the slab prior to reduction, and with support rolls arranged between the reduction rolls, is used to continuously cast a slab while reducing the slab by the reduction rolls. At which time, due to the combination of reduction of the unsolidified section by the reduction rolls of the first stage and reduction of the solidified section by the reduction rolls of the second stage, the casting speed is slowed from a state in which the slab is cast at a continuous casting speed, the location of complete solidification of the slab shifts towards the upstream side as result, in association with which there is a switch to a combination of reduction of the final-stage solidifying section by the reduction rolls of the first stage, and reduction of the solidified section by the reduction rolls of the second stage.
Description
technical field [0001] The present invention relates to a continuous casting method of a slab, in particular to a continuous casting method of a slab capable of producing a slab with excellent internal quality. Background technique [0002] When rolling a continuous casting slab to produce an extremely thick steel plate, it is important to reduce the central segregation and central porosity generated in the central portion of the continuous casting slab in the thickness direction. Therefore, for the purpose of improving the internal quality of the slab, the slab is pressed inside and outside the continuous casting machine. In an extremely thick steel plate obtained by rolling a cast slab with excellent internal quality as a raw material, the occurrence of internal defects due to center porosity is suppressed, and the internal quality is excellent. [0003] The following techniques exist as conventional techniques for pressing a slab. Japanese Patent No. 1480540 (Patent Doc...
Claims
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Patent Timeline
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CPCB22D11/1282B21B1/463B21B2201/14C22C38/02C22C38/04C22C38/06C22C38/08B22D11/16B21B1/026B22D11/1206B22D11/128B22D11/20B21B1/04B21B2001/028B22D11/041
Inventor 田岛直树山中章裕田口谦治
Owner NIPPON STEEL CORP