Method and device for controlling austenite grain size of continuous casting slab, and product

A technology of austenite grain and control method, applied in the field of metallurgical continuous casting, can solve problems such as affecting the surface quality of the casting billet, and achieve the effects of preventing narrow-face crack defects, reducing temperature gradients, and reducing shrinkage stress

Active Publication Date: 2020-02-18
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the coarse austenite grains in the middle of the narrow face affect the surface quality of the slab, the present invention provides a method and device for controlling the austenite grain size of the continuous casting slab, which prolongs the cooling length of the narrow face and cooperates with crystallization The strong cooling of the device and the vertical section reduces the uneven cooling of the narrow surface and realizes the uniform refinement of the original austenite grains

Method used

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  • Method and device for controlling austenite grain size of continuous casting slab, and product
  • Method and device for controlling austenite grain size of continuous casting slab, and product
  • Method and device for controlling austenite grain size of continuous casting slab, and product

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Embodiment 1

[0028] The continuous casting machine used in the specific embodiment is a straight arc conventional slab continuous casting machine, the metallurgical length is 33.2m, the arc radius is 10.9m, and it is composed of 15 sector sections, of which 2 sections are curved sections and 9 sections are straightening Straight section, casting machine annual production capacity is 2.8 million tons / year.

[0029] Select the steel type M510L, its target composition is shown in the table below, and the section of the continuous casting slab is 230×1600mm.

[0030]

[0031] Steelmaking - molten steel with qualified refining composition and cleanliness is continuously passed through the crystallizer and the secondary cooling section through the protection casting of "large ladle + long nozzle" and "tandem ladle + submerged nozzle". According to the steel type, the crystallizer taper is set to 1.10%, the casting speed is controlled at 1.30m / min, the crystallizer adopts fast cooling, the wat...

Embodiment 2

[0036] A control method, device and product for continuous casting slab austenite grains. Except following technical parameter, all the other are with embodiment 1.

[0037] Select the steel type M590L, its target composition is shown in the table below, and the section of the continuous casting slab is 230×1800mm.

[0038]

[0039]The water flow velocity of the wide surface and narrow surface tanks is 6.9m / s and 7.2m / s respectively, and the water temperature at the entrance is controlled at 26-28°C;

[0040] Vertical section wide surface water is 433L / m 2 , the water volume of narrow face foot roll is 448L / m 2 .

[0041] The third nozzle 4 faces downwards, its centerline is in a vertical plane and the included angle a with the horizontal plane is 20°.

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Abstract

The invention discloses a method and device for controlling the austenite grain size of a continuous casting slab, and a product, and belongs to the technical field of metallurgical continuous casting. A crystallizer is included, a foot roller cooling area is connected and arranged at the lower part of the narrow surface of the crystallizer, and a spraying mechanism is matched with the foot rollercooling area. On one hand, the narrow surface cooling can be increased to further prevent the growth of original austenite grains, the grains are uniformly refined, and the microstructure strength ofthe surface layer of a casting blank is improved; on the other hand, the transverse temperature gradient of the narrow surface area of the casting blank can be reduced, and the shrinkage stress in the subsequent cooling process can be reduced, so that the narrow surface crack defect is prevented.

Description

technical field [0001] The invention belongs to the technical field of metallurgical continuous casting, and more specifically relates to a method, device and product for controlling the austenite grain size of a continuous casting slab. Background technique [0002] Continuous casting is a more economical and efficient production method in the smelting process of iron and steel materials. Since the continuous casting process is a dynamic cooling process, the slab needs to be cooled by the mold and the secondary cooling section. The microstructure control of the surface layer of the slab has a significant impact on the surface quality of the slab, especially for the corner quality of some microalloyed steels. Under the current continuous casting process conditions, due to the uneven cooling and cooling shrinkage of the narrow face and corners, it is difficult to achieve a perfect fit between the mold taper and the billet shell, resulting in certain areas (especially the corn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/055B22D11/22B22D11/20
CPCB22D11/055B22D11/22B22D11/20
Inventor 张乔英朱伦才常正昇朱涛杨克枝孙健钟鹏郑晴周寿好
Owner MAANSHAN IRON & STEEL CO LTD
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