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Method for Controlling Subcutaneous Bubble Defects of Medium Carbon Steel Wide and Thick Slabs

A slab and carbon steel technology is applied in the field of controlling the subcutaneous bubble defects of medium carbon steel wide and thick slabs, and can solve the problems of medium carbon steel slab bubble defects, reducing the hot transfer rate of the casting slab, and increasing the labor volume of workers. Achieve the effect of increasing the proportion of solid phase billet shells, reducing the scrap rate, and reducing the amount of billet cleaning

Active Publication Date: 2020-08-28
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bubble defects under the slab skin seriously affect the surface quality of the rolled material, and must be cleaned thoroughly before entering the next process, which not only increases the labor load of workers, reduces the metal yield, but also reduces the hot delivery rate of the cast slab
[0003] In order to avoid bubble-like defects, it is generally believed that it is more effective to use solid stopper rods and reduce the amount of protective gas blown into the tundish. However, when the above methods are used in actual production, bubble-like defects will still appear in medium carbon steel slabs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: The specific process of the method for controlling subcutaneous air bubble defects in wide and thick slabs of medium carbon steel is as follows.

[0013] (1) The cast steel type is medium carbon steel, the main component content (wt): C 0.30%, Si 0.22%, Mn 0.53%, P0.012%, S 0.003%, Al 0.021%; the specification of continuous casting slab: 330mm ×2400mm, casting speed is 0.65m / min.

[0014] (2) After pouring, use low-alkalinity crystallizer mold slag with an alkalinity of 1.0; adopt a suitable cooling strength in the curved section and control it at 0.18kg / L; use a lower reduction rate in the light-reduction area to control At 0.60mm / m; using a solid stopper, the parameters of argon blowing in the middle cladding ring gap are: the actual pressure is controlled at 0.20MPa, and the flow rate of argon blowing is controlled at 2L / min.

[0015] (3) The continuous casting slab obtained in this example was inspected on the surface, and no subcutaneous bubble-like ...

Embodiment 2

[0016] Embodiment 2: The specific process of the method for controlling subcutaneous air bubble defects in wide and thick slabs of medium carbon steel is as follows.

[0017] (1) The casting steel type is medium carbon steel, the main component content (wt): C 0.55%, Si 0.20%, Mn 0.55%, P0.011%, S0.002%, Al 0.023%; the specifications of the continuous casting slab are: 330mm×2100mm, casting speed is 0.70m / min.

[0018] (2) After pouring, use low-alkalinity crystallizer mold slag with an alkalinity of 1.1; adopt a suitable cooling strength in the bending section and control it at 0.23kg / L; use a lower reduction rate in the light-reduction area to control At 0.70mm / m; using a solid stopper rod, the parameters of argon blowing in the middle cladding ring seam are: the pressure is actually controlled at 0.30MPa, and the flow rate of argon blowing is controlled at 4L / min.

[0019] (3) The continuous casting slab obtained in this example was inspected on the surface, and no subcuta...

Embodiment 3

[0020] Embodiment 3: The specific process of the method for controlling subcutaneous air bubble defects in wide and thick medium carbon steel slabs is as follows.

[0021] (1) The casting steel type is medium carbon steel, the main component content (wt): C 0.50%, Si 0.20%, Mn 0.56%, P0.010%, S 0.003%, Al 0.025%; continuous casting slab specification: 330mm ×2200mm, the casting speed is 0.65m / min.

[0022] (2) After pouring, use low-alkalinity crystallizer mold slag with an alkalinity of 1.05; adopt a suitable cooling strength in the curved section and control it at 0.20kg / L; use a lower reduction rate in the light-reduction area to control At 0.65mm / m; using a solid stopper, the argon blowing parameters in the middle cladding ring seam are: the pressure is actually controlled at 0.25MPa, and the flow rate of argon blowing is controlled at 3L / min.

[0023] (3) The continuous casting slab obtained in this example was inspected on the surface, and no subcutaneous bubble-like de...

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Abstract

The invention discloses a method for controlling hypodermic bubble defects of a wide and thick slab of medium carbon steel. In the casting process, crystallizer protecting slag with alkalinity of 1.0-1.1 is used; the cooling strength of the bent section is controlled between 0.18-0.23 kg / L; the deformation is controlled to be 0.60 mm / m-0.70 mm / m under light pressure. A solid stopper rod is used, the argon blowing pressure of the middle ladle circular seam is 0.20-0.30 MPa, and the argon blowing flow is 2-4 L / min. According to the invention, the hypodermic bubble defects of the wide and thick slab of medium carbon steel can be effectively controlled, the cleaning amount of the casting blank in the later stage is reduced, the cleaning-free is achieved, meanwhile, the rejection rate of the rolled material is reduced, and the production cost is reduced; the system has the advantages of completeness and strong operability, can be rapidly popularized and promoted in production lines, and hasremarkable benefits.

Description

technical field [0001] The invention relates to a continuous casting method, in particular to a method for controlling subcutaneous air bubble defects of medium carbon steel wide and thick slabs. Background technique [0002] In the process of continuous casting billet production, due to the process, equipment and other reasons, it is easy to cause subcutaneous air bubble defects in the continuous casting billet. There are two possible reasons for the formation: (1) Mold mold powder due to excessive fluctuations in the liquid level of the mold Particles are entangled in the molten steel and caught by the primary shell, forming subcutaneous slag; (2) The argon blown in the tundish protection pouring may also enter the molten steel and be captured by the solidification front, resulting in subcutaneous bubbles. These two kinds of defects are difficult to distinguish during the slab sampling inspection process, and may even coexist together. In actual production, it is found th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/108B22D11/11B22D11/16B22D11/22C22C38/06C22C38/04C22C38/02
CPCB22D11/108B22D11/111B22D11/16B22D11/22C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 李杰李建新董廷亮梁爱国张倩李超
Owner HEBEI IRON AND STEEL
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