Method for reducing erosion of Al2O3-C stopper during pouring of aluminum killed cold heading steel

A technology of cold heading steel and al2o3-c, which is applied in the direction of casting molten material containers, manufacturing tools, metal processing equipment, etc., can solve the problems of aluminum-killed cold heading steel corrosion, etc., reduce the consumption of aluminum wires, reduce the cost per ton of steel, Effect of avoiding stopper rod erosion

Inactive Publication Date: 2017-12-15
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of casting aluminum killed cold heading steel when reducing Al 2 o...

Method used

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  • Method for reducing erosion of Al2O3-C stopper during pouring of aluminum killed cold heading steel
  • Method for reducing erosion of Al2O3-C stopper during pouring of aluminum killed cold heading steel
  • Method for reducing erosion of Al2O3-C stopper during pouring of aluminum killed cold heading steel

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Now choose the steel type as cold heading steel as SWRCH22AB as an example to illustrate.

[0032] The molten steel tapped from the SWRCH22AB converter enters the LF refining station to start refining. By adding lime, calcium carbide and other slag materials to make white slag, adding alloys such as ferromanganese, adjusting the flow rate of bottom-blown argon, feeding aluminum wire, feeding calcium wire and other process steps to Complete the refining tasks such as desulfurization, adjustment of molten steel [Al] and [Ca], adjustment of temperature, and removal of inclusions. When LF refining and tapping, the [Al] in molten steel is 0.030%, 4.5×10 -6 , when the tundish is poured, the full protection pouring is used, and the Al 2 O 3 -C quality integral stopper rod to control the flow rate of molten steel during the pouring process. Al used in the tundish to protect the pouring process 2 O 3 -Al in quality C monolithic stopper rod 2 O 3 The mass percentage is 58...

Embodiment 2

[0035] Now choose the steel type as cold heading steel as SWRCH22AB as an example to illustrate.

[0036] The molten steel tapped from the SWRCH22AB converter enters the LF refining station to start refining. By adding lime, calcium carbide and other slag materials to make white slag, adding ferromanganese and other alloys, adjusting the flow of argon gas at the bottom, feeding aluminum wire, feeding calcium wire and other process steps to Complete the refining tasks such as desulfurization, adjustment of molten steel [Al] and [Ca], adjustment of temperature, and removal of inclusions. When LF refining and tapping, the [Al] in molten steel is 0.039%, 7.8×10 -6 , when the tundish is poured, the full protection pouring is used, and the Al 2 O 3 -C quality integral stopper rod to control the flow rate of molten steel during the pouring process. Al used in the tundish to protect the pouring process 2 O 3 -Al in quality C monolithic stopper rod 2 O 3 The mass percentage is 60...

Embodiment 3

[0039] Now choose the steel type as cold heading steel as SWRCH22AB as an example to illustrate.

[0040] The molten steel tapped from the SWRCH22AB converter enters the LF refining station to start refining. By adding lime, calcium carbide and other slag materials to make white slag, adding ferromanganese and other alloys, adjusting the flow of argon gas at the bottom, feeding aluminum wire, feeding calcium wire and other process steps to Complete the refining tasks such as desulfurization, adjustment of molten steel [Al] and [Ca], adjustment of temperature and removal of inclusions. When LF refining and tapping, the [Al] in molten steel is 0.045%, is 10×10 -6 , when the tundish is poured, the full protection pouring is used, and the Al 2 O 3 -C quality integral stopper rod to control the flow rate of molten steel during the pouring process. Al used in the tundish to protect the pouring process 2 O 3 -Al in quality C monolithic stopper rod 2 O 3 The mass percentage is...

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Abstract

The invention discloses a method for reducing the erosion of an Al2O3-C stopper during pouring of aluminum killed cold heading steel. The whole Al2O3-C stopper is adopted to control the flow rate of molten steel in a pouring process; the pouring of the aluminum killed cold heading steel comprises LF (Ladle Furnace) refining and tundish pouring; during steel tapping in the LF refining, [Al] in the molten steel is controlled at 0.030 to 0.055 percent, w[Ca]<3>%/w[Al]<2>% is (3.6 to 12.8)x10<-6>, and accords with conditions that in the whole Al2O3-C stopper, the mass percentage of Al2O3 is not less than 50 percent, the mass percentage of SiO2 is not more than 15 percent, and the mass percentage of ZrO2 is not less than 5 percent. By selection of proper measures of the ranges of [Al] and [Ca] in the molten steel, optimization of the LF refining and tundish pouring processes and the like, on one hand, inclusions such as aluminum oxide in the molten steel is fully modified, and on the other hand, severe stopper erosion is avoided. Compared with existing certain processes, the technological method has the advantages that the cleanness and the pourability of the molten steel are improved, the problem of fluctuation of a liquid level in the pouring process is effectively controlled, and the number of continuous pouring furnaces and the quality of a cast billet are also obviously improved.

Description

technical field [0001] The present application relates to the field of out-of-furnace refining and continuous casting of molten steel, in particular to a method of reducing Al when casting aluminum-killed cold heading steel 2 O 3 - Method for corroding of quality stopper rods. Background technique [0002] Good billet quality requires high-efficiency continuous casting process, and high-efficiency continuous casting process requires stable and continuous casting, and stopper rod is one of the key refractory materials for high-reliability continuous casting. The use of stopper rod directly affects the molten steel. Pourability. In actual production, the erosion or nodulation of the stopper rod causes large fluctuations in the molten steel level of the mold, and is forced to close the flow, which reduces the number of continuous pouring furnaces of molten steel, which is not conducive to improving the cleanliness of molten steel and normal organizational production. , incre...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C7/06C21C7/00B22D41/18
CPCB22D41/18C21C7/0056C21C7/06C21C7/064
Inventor 赵家七邹长东刘飞蔡小锋李解
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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