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Mold Mold Flux for Improving the Service Life of Submerged Nozzle

A mold flux and immersion technology, which is applied in the field of continuous casting, can solve problems such as poor results, and achieve the effects of improving continuous casting production efficiency, reducing fluorine content, and improving the life of immersion nozzles

Active Publication Date: 2020-12-25
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still not effective in solving the erosion of the slag line at the nozzle. It is necessary to simultaneously improve the physical and chemical indicators of mold slag while adopting the above methods

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment is in 220×220mm 2 It is carried out on a four-strand billet continuous casting machine, using a straight-through submerged nozzle, and the material of the slag line of the nozzle is ZrO 2 -C, the wall thickness is 25mm, and the mass percentage of the finished product of continuous casting steel is as follows:

[0025] C≤0.018, Si 0.20-0.40, Mn 0.30-0.50, P≤0.035, S≤0.010, Cr 12.10-12.50, Ni≤0.60, N≤0.018, and the balance of iron.

[0026] Select the mold powder with the following physical and chemical indicators:

[0027] CaO 32%, SiO 2 37.2%, MgO 1.7%, Al 2 o 3 8.3%, Fe 2 o 3 0.2%, T·C 4.2%, ∑RO+RO 2 6.5%, melting point is 1100℃, alkalinity (CaO / SiO 2 )0.86, F - 2.6%, viscosity (1300°C) 0.60 Pa·s, moisture 0.2%.

[0028] Using the above indicators of mold mold powder, the average amount of molten steel per furnace is 83t, the casting time is 52min, 10 heats of steel are continuously cast, the residual wall thickness of the nozzle slag line...

Embodiment 2

[0030] This embodiment is carried out on a four-strand round billet continuous casting machine with a diameter of 230mm, using a straight-through submerged nozzle, and the material of the slag line of the nozzle is ZrO 2 -C, the wall thickness is 23mm, and the mass percentage of the finished product of continuous casting steel is as follows:

[0031] C≤0.025, Si 0.20-0.40, Mn 0.30-0.50, P≤0.030, S≤0.010, Cr 16.60-17.50, Ni≤0.15, N≤0.025, and the balance of iron.

[0032] Select the mold powder with the following physical and chemical indicators:

[0033] CaO 36%, SiO 2 36%, MgO 0.9%, Al 2 o 3 6.7%, Fe 2 o 3 0.9%, T·C 5.0%, ∑RO+RO 2 8.1%, melting point is 1150℃, alkalinity (CaO / SiO 2 )1.0, F - 4.2%, viscosity (1300°C) 0.40 Pa·s, moisture 0.3%.

[0034] In this example, the average amount of molten steel per furnace is 85t, the casting time is 55min, 10 furnaces are continuously cast, the residual wall thickness at the submerged nozzle slag line is 10mm, the erosion...

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Abstract

The invention discloses crystallizer protecting slag prolonging the service life of a submerged nozzle. The binary basicity (CaO / SiO2) of the crystallizer protecting slag is 0.86-1.0, the content of F<-> is 2.6-4.2%, and the viscosity under 1300 DEG C is 0.40-0.60 Pa.s. According to the crystallizer protecting slag prolonging the service life of the submerged nozzle, during continuous casting of ferrite stainless steel, due to the fact that the binary basicity (CaO / SiO2) of the crystallizer protecting slag, the content of F<->, and the viscosity are controlled within preset ranges, the erosionrate of a submerged nozzle slag line can be lowered, the service life of the submerged nozzle is prolonged, continuous casting multi-furnace continuous casting is achieved, and the production efficiency of continuous casting is improved; meanwhile, the problem that due to hole penetrating and breaking of the nozzle slag line portion, the molten steel quality is affected is solved; and besides, the content of fluorine in the crystallizer protecting slag can also be lowered, and pollution caused by fluoride to the atmosphere is reduced.

Description

technical field [0001] The invention relates to the technical field of continuous casting, in particular to a mold powder for improving the service life of a submerged nozzle. Background technique [0002] Because continuous casting has many advantages such as energy saving and consumption reduction, high production efficiency, mechanization and automatic operation, etc., when designing and producing various parts blanks, the continuous casting method is often preferred to make molten steel solidify and form. The submerged nozzle is located between the continuous casting tundish and the mold, which has the functions of preventing secondary oxidation and splashing of the molten steel, adjusting the flow field of the molten steel in the mold, and preventing the mold slag from being involved in the molten steel; the mold slag is placed on the surface of the molten steel in the mold , has the functions of thermal insulation, air isolation, lubricating casting slab, improving hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/002B22D11/111
Inventor 张增武陈景锋王鹏张润平李忠利李晓军李振王宏业
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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