Method and device for inhibiting size of austenite grains at corners of continuous casting slab
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A technology for austenite grains and slabs is applied in the field of suppressing the size of austenite grains at the corners of continuous casting slabs. , simple to make, and the effect of increasing the cooling rate
Inactive Publication Date: 2020-03-06
MAANSHAN IRON & STEEL CO LTD
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[0008] Aiming at the problems of uneven cooling at the corners of the slab caused by the existing elongated mold, relative extension of the indirect weakly cooled part of the slab in the mold, and increased tendency of cracks, the present invention provides a convenient and effective method with a simple structure and The crystallizer device used to improve the quality of the narrow face of the continuous casting slab with low production cost and easy replacement and use, reduces the severity and occurrence probability of transverse cracks at the corners of the continuous casting slab, and improves the quality of the corners of the continuous casting slab
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Embodiment 1
[0035] Such as Figure 1 to Figure 3 As shown, the casting slab thickness corresponding to the mold of this embodiment is 230 mm, the casting slab width is 950-2150 mm, the height of the wide copper plate 2 of the crystallizer is 900 mm, and the narrow copper plate 4 is 300 mm shorter than the wide copper plate 2.
[0036] The specific crystallizer device includes wide copper plate 2, wide support plate 3, narrow copper plate 4, narrow support plate 1, foot roller 7, first spray rod 8 branch pipes, foot roller support (not marked in the figure), Spray rod 8, spray rod bracket 6, second spray branch pipe 9 and nozzle 10; two wide-faced copper plates 2 are arranged symmetrically and respectively fixed on corresponding wide-faced support plates 3; The narrow copper plates 4 between the 2 are symmetrically arranged and fixed on the corresponding narrow support plates 1, the upper end surfaces of the narrow copper plates 4 and the wide copper plates 2 are flush, and the height betw...
Embodiment 2
[0042] The crystallizer device of the present embodiment, except following technical parameter, all the other are the same as embodiment 1.
[0043] The height difference between the wide copper plate 2 and the narrow copper plate 4 is 200mm.
[0044] The number of the foot rolls 7 is 4 pairs, and the downward angle between the first spray branch pipe 5 and the narrow surface of the slab is 45°.
[0045] The number of the nozzles 10 is 7 pairs.
Embodiment 3
[0047] The crystallizer device of the present embodiment, except following technical parameter, all the other are the same as embodiment 1.
[0048] The height difference between the wide copper plate 2 and the narrow copper plate 4 is 100 mm.
[0049] The number of the foot rolls 7 is 4 pairs, and the downward angle between the first spray branch pipe 5 and the narrow surface of the slab is 60°.
[0050] The number of the nozzles 10 is 7 pairs.
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Abstract
The invention discloses a method and device for inhibiting size of austenite grains at corners of a continuous casting slab, and belongs to the technical field of metallurgical continuous casting. Thedevice comprises a wide-face copper plate fixed to a wide-face supporting plate and a narrow-face copper plate fixed to a narrow-face supporting plate, wherein the upper end face of the narrow-face copper plate is flush with the upper end face of the wide-face copper plate; the lower end face of the narrow-face copper plate is 100-300mm shorter than the lower end face of the wide-face copper plate; foot roller supports are symmetrically fixed to the lower end face of the narrow-face supporting plate; foot rollers are symmetrically arranged on the foot roller supports; the inner roller face formed by the foot rollers positioned on one side and the inner wall of the narrow-face copper plate are positioned on the same plane; a spraying rod is fixed to the foot roller supports through spraying rod supports; and one end of a spraying branch pipe is fixed to the spraying rod and communicates with an inner cavity of the spraying rod, and a nozzle is mounted at the other end of the spraying branch pipe. The heat transfer condition is improved, the cooling rate is increased, surface grain refinement and dispersion distribution and precipitation of precipitates in crystals are effectively promoted, and the quality of the narrow face of the casting slab is improved.
Description
technical field [0001] The invention belongs to the technical field of metallurgical continuous casting, and more specifically relates to a method and a device for suppressing the austenite grain size at the corner of a continuous casting slab. Background technique [0002] Continuous casting technology is an important technology in the iron and steel industry, which plays an important role in realizing the high efficiency and intensification of the steel production process and the specialization and high quality of product varieties. The crystallizer is a key part of the main equipment of the continuous casting machine, which makes the molten steel forcedly cooled and initially solidified to form a billet shell with a certain thickness and ensure the uniform and stable growth of the billet shell. The heat transfer effect between the solidified billet shell and the mold It is directly related to the production efficiency of the casting machine and the quality of the slab. ...
Claims
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