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Alloy cored wire capable of lowering superheat degree of molten steel and use method thereof

A technology of cored wire and superheat, applied in the field of casting, can solve the problems of low strength of inorganic heat-absorbing materials, easy moisture absorption of inorganic heat-absorbing materials, narrow crystallizer inner cavity, etc., to improve solidification structure, macro segregation, Improvement of billet quality

Inactive Publication Date: 2020-02-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low strength and high brittleness of inorganic heat-absorbing materials, they are easily broken when placed in the steel ingot mold by the impact of molten steel, and they float up without melting, and the heat-absorbing effect is significantly affected.
In addition, exposed inorganic heat-absorbing materials are easy to absorb moisture and are inconvenient to handle
Furthermore, the inner cavity of the mold for steel continuous casting is relatively narrow, and the heat-absorbing rods are not suitable for use in the continuous casting process.

Method used

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  • Alloy cored wire capable of lowering superheat degree of molten steel and use method thereof
  • Alloy cored wire capable of lowering superheat degree of molten steel and use method thereof
  • Alloy cored wire capable of lowering superheat degree of molten steel and use method thereof

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preparation example Construction

[0032] The present invention does not have any special limitations on the preparation method of the cored wire, and the preparation process of the cored wire well known to those skilled in the art may be used.

[0033] The present invention also provides a method for reducing the superheat of molten steel by using the cored wire described in the above technical solution, which includes the following steps:

[0034] The cored wire is fed into the molten steel through the wire feeding machine.

[0035] In the present invention, the condition for completion of the wire feeding is preferably to reduce the superheat of the molten steel by 3 to 10°C. The degree of superheat of the molten steel is preferably detected by a thermocouple.

[0036] In the present invention, the wire feeding rate and the wire feeding amount of the cored wire are preferably determined according to the amount of molten steel and the specific casting process.

[0037] When the casting process is die casting, it is pr...

Embodiment 1

[0046] The experimental steel is GCr15SiMn. The weight of the steel ingot is 5t. The outer diameter of the cored wire is 9mm, the metal shell material is 20 steel, the thickness is 0.20mm, and the core material is CaO-CaF 2 , The corresponding mass ratio is 1:4;

[0047] Install the cored wire in the winding reel 6 and fix it on the wire feeding machine 7;

[0048] In the steel casting mold 9, the bottom casting method is used to inject molten steel, and the pouring temperature is 1490℃. When the height of the molten steel reaches 8300mm or 35~45s after pouring starts, the wire feeder 7 is started, and the wire feeding rate is controlled by the main transmission device 5. , The wire feeding rate is 4.80~4.90cm / s, the cored wire 4 is fed into the molten steel 8. After the cored wire 4 enters the molten steel 8, the cored wire 4 gradually melts, and the metal shell 2 melts into the molten steel. The core material 1 absorbs the sensible heat in the molten steel 8 and floats to the s...

Embodiment 2

[0050] The experimental steel grade is GCr15, the pouring superheat is 20℃, the continuous casting billet size is 280×320mm, and the drawing speed is 0.6-0.8m / min.

[0051] The outer diameter of the cored wire is 9mm, the metal shell material is 20 steel, the thickness is 0.20mm, and the core material is CaO-CaF 2 , The corresponding mass ratio is 1:4.

[0052] The cored wire is installed in the winding reel 6 and fixed on the wire feeding machine 7.

[0053] The molten steel in the ladle 13 enters the mold 11 through the tundish 12. After the molten steel fills the mold 11 and forms the continuous casting billet shell 10, the continuous casting starts, the wire feeding machine 7 is started, and the feeding is controlled by the main transmission device 5. The wire speed, the wire feeding rate is 6.5~8.5cm / s, the cored wire 4 is fed into the molten steel 8. After the cored wire 4 enters the molten steel 8, the cored wire 4 gradually melts, and the metal shell 2 melts into the steel T...

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Abstract

The invention relates to the technical field of steel casting, in particular to an alloy cored wire capable of lowering the superheat degree of molten steel and a use method thereof. The alloy cored wire provided by the invention comprises inorganic heat-absorbing materials of a core, and an outside metal shell. The alloy cored wire is fed into a crystallizer or the molten steel in an ingot mold through a wire feeder in the casting process. The metal shell of the alloy cored wire melts gradually and enters the molten steel (components of the molten steel are not influenced), the heat-absorbingmaterials of the core absorb sensible heat to melt and float up to the surface at the same time, thus the superheat degree of the molten steel is lowered, the cooling rate of the molten steel is increased, and finally the target of improvement of quality of casting blanks is achieved.

Description

Technical field [0001] The present invention relates to the technical field of casting, in particular to a cored wire for reducing the superheat of molten steel and a method of use thereof. Background technique [0002] The degree of superheat is one of the key parameters that determine the quality of the slab. For continuous casting, excessive overheating will worsen center segregation, induce leakage accidents, and promote columnar crystal growth, while low superheat casting can increase the pulling speed, reduce leakage accidents, increase equiaxed crystal ratio and slab Internal and external quality. In addition, low superheat casting can also reduce the tapping temperature and increase the service life of the furnace lining. However, low superheat casting often results in nozzle nodules during the casting process. For die casting, low superheat casting is not conducive to the floating removal of inclusions. At present, the control of molten steel superheat is mainly achi...

Claims

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Application Information

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IPC IPC(8): C21C7/00B22D11/108B22D27/20
CPCC21C7/0056B22D11/108B22D27/20B22D27/04B22D11/11
Inventor 李传军任忠鸣朱龙强
Owner SHANGHAI UNIV
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