Baffle for special-shaped blank continuous casting machine tundish and preparation method thereof
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A special-shaped billet continuous casting and deflector technology, which is applied to the tundish process field of special-shaped billet continuous casting in iron and steel metallurgy, can solve the problem of uneven flow field of molten steel, and achieve the effects of reducing excess injection, realizing uniform distribution, and promoting floating removal.
Inactive Publication Date: 2009-08-12
SHANDONG IRON & STEEL CO LTD
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[0003] Aiming at the technical characteristics of the profiled billet continuous casting tundish and the defects of the prior art, the present invention provides a deflector, which solves the problem of uneven flow field of molten steel in the profiled billet continuous casting tundish through the diversion function of the deflector, so that each The flow temperature difference is reduced from 12°C to 4°C, thereby reducing breakout stoppages and slab quality defects caused by high intermediate flow temperatures
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Embodiment 1
[0032] A deflector for the tundish of a profiled billet continuous casting machine, which adopts magnesia prefabricated parts and is composed of the following materials by weight percentage: fused magnesia: 10-5mm28%; 5-3mm14%, 3-1mm25% , 1~0.074mm20%, 2 Ultrafine powder 1.5%.
[0033] The fused magnesia is a first-grade fused magnesia containing MgO≥97% (weight ratio), and the SiO 2 Ultrafine powder, wherein the SiO2 content is ≥ 92%, the particle size is less than 5 μm, and the particle size is less than 2 μm, accounting for 80-85%.
[0034] The deflector (2) has an arc-shaped overall structure, the radian α of the deflector is 92°, the height H is 750mm, the thickness h is 160mm, the upper width a of the trapezoidal groove is 120mm, and the lower width b is 200mm. The groove height c is 250 mm.
[0035] After weighing the above-mentioned materials according to the stated ratio, add them into the mixer for dry mixing for 2-3 minutes, add 6-8% water of the total weight of t...
Embodiment 2
[0039] Others are the same as embodiment 1, the difference is:
[0040] The guide plate used for the tundish of the profiled billet continuous casting machine is made of magnesia prefabricated parts, and is composed of the following materials according to the weight percentage: fused magnesia: 10~5mm particle size 30%, 5~3mm particle size 12%, 3~3mm particle size 1mm particle size 24%, 1~0.074mm particle size 21%, 2 Ultrafine powder 1.8%.
[0041] The deflector (2) has an arc-shaped overall structure, the radian α of the deflector is 95°, the height H is 800 mm, the thickness h is 180 mm, the upper width a of the trapezoidal groove is 102 mm, and the lower width b is 235 mm. The groove height c is 210 mm.
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Abstract
The invention relates to a baffle applied to a tundish of a profiled blank conticaster and a preparing method thereof, belonging to the technical field of the profiled blank continuous casting tundish process in ferrous metallurgy. A guide plate (2) adopts magnesium preformed unit. The baffle is of arc monolithic structure, the arc degree alpha is 90-95 degrees, and a dovetail groove (6) is arranged on the two sides. The guide plate (2) is arranged on the external side of a current stabilizer (1). The upper edge of the guide plate (2) is 120-150mm higher than the upper edge of the current stabilizer (1). Slag blocking dams (3) are respectively arranged between the external side of the dovetail groove (6) of the guide plate (2) and the external side of two sizing nozzles (4) of a middle casting flow. By the shunting function of the guide plate, the compositions and the temperature of molten steel in the tundish of the profiled blank are uniformed. The temperature difference of three casting flows of the profiled blank is lowered from 12 DEG C to 4 DEG C. Casting blank quality defects and steel breakout accidents caused by high molten steel temperature of the middle casting flow are solved. Simultaneously, the upward floating elimination of inclusions is promoted. The qualified rate of the profiled blank is improved and reaches more than 99.7 percent.
Description
technical field [0001] The invention relates to a deflector for a tundish of a profiled billet continuous casting machine and a preparation method thereof, belonging to the technical field of profiled billet continuous casting tundish technology in iron and steel metallurgy. Background technique [0002] Due to the particularity of its section, the special-shaped billet continuous casting machine is a new continuous casting process integrating round billet, square billet and slab. The tundish has different technological characteristics from other traditional continuous casting tundishes. The tundish is narrow and long The trapezoidal package, each strand is poured with two sizing nozzles, and the distance between the two sizing nozzles of each strand of different slab sections is different. Laiwu Steel's large H-beam special-shaped billet continuous casting machine is the largest and thinnest special-shaped billet continuous casting machine in China jointly constructed by La...
Claims
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