Tundish covering agent for continuous casting of low-carbon steel containing Al and Ti and application thereof

A continuous casting tundish and covering agent technology, applied in the field of steel continuous casting, can solve the problems of inapplicability to low-carbon steel, not considering special problems, not considering the carbonization of the covering agent, etc., so as to improve the cleanliness and the quality of the casting billet. , the effect of preventing carbon increase

Inactive Publication Date: 2016-03-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the patent "Tundish Covering Agent" whose publication number is CN103111592A, although the tundish covering agent can absorb non-metallic inclusions in the molten steel, purify the molten steel and keep the molten steel warm, does not consider that the covering agent will increase the temperature of the molten steel. Carbon, so it is not suitable for low-carbon steel; the patent "High Alkalinity Tundish Covering Agent" with the publication number CN104001884A discloses a tundish covering agent specially designed for ultra-low carbon steel, although it can effectively prevent carbonation , but does not consider the special problems caused by active elements in low-carbon steel containing Al and Ti, so it is not suitable for low-carbon steel containing Al and Ti

Method used

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  • Tundish covering agent for continuous casting of low-carbon steel containing Al and Ti and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A low-carbon steel continuous casting tundish covering agent containing Al and Ti, which includes the following components in mass percentage: CaO: 37.3%, SiO 2 : 9.9%, Al 2 o 3 : 28.3%, MgO: 8.1%, (Na 2 O+Li 2 O): 9.4%, B 2 o 3 : 3.9%, C: 1.4%, TiO 2 : 1.7%. The basicity of the tundish covering agent CaO / SiO 2 It is 3.77:1. In the tundish covering agent, Na 2 O and Li 2 The mass ratio of O is 8:1.

[0039] The main physical properties of the tundish covering agent measured by the above method are shown in Table 1.

[0040] The tundish covering agent of this embodiment is used for carbon content is 0.03wt%, and Al content is 0.3wt%, and Ti content is the continuous casting process of containing Al, Ti low carbon steel of 0.3wt%; The oxygen content is less than 12ppm, the total amount of inclusions in the molten steel is reduced by 46% before and after passing through the tundish, and the temperature of the molten steel drops by 8°C.

Embodiment 2

[0042] A low-carbon steel continuous casting tundish covering agent containing Al and Ti, which includes the following components in mass percentage: CaO: 33.6%, SiO 2 : 13.3%, Al 2 o 3 : 27.1%, MgO: 9.1%, (Na 2 O+Li 2 O): 9.9%, B 2 o 3 : 4.6%, C: 0.8%, TiO 2 : 1.6%. The basicity of the tundish covering agent CaO / SiO 2 It is 2.53:1. In the tundish covering agent, Na 2 O and Li 2 The mass ratio of O is 12:1.

[0043] The main physical properties of the tundish covering agent measured by the above method are shown in Table 1.

[0044] The tundish covering agent of this embodiment is used for carbon content is 0.03wt%, and Al content is 0.3wt%, and Ti content is the continuous casting process of containing Al, Ti low carbon steel of 0.3wt%; When the oxygen content is less than 15ppm, the total amount of inclusions in the molten steel is reduced by 51% before and after passing through the tundish, and the temperature of the molten steel drops by 9°C.

Embodiment 3

[0046] A low-carbon steel continuous casting tundish covering agent containing Al and Ti, which includes the following components in mass percentage: CaO: 41.8%, SiO 2 : 7.9%, Al 2 o 3 : 30.6%, MgO: 6.3%, (Na 2 O+Li 2 O): 7.2%, B 2 o 3 : 4.1%, C: 0.6%, TiO 2 : 1.5%. The basicity of the tundish covering agent CaO / SiO 2 It is 5.29:1. In the tundish covering agent, Na 2 O and Li 2 The mass ratio of O is 20:1.

[0047] The main physical properties of the tundish covering agent measured by the above method are shown in Table 1.

[0048] The tundish covering agent of this embodiment is used for carbon content is 0.03wt%, and Al content is 0.3wt%, and Ti content is the continuous casting process of containing Al, Ti low carbon steel of 0.3wt%; The oxygen content is less than 17ppm, the total amount of inclusions in the molten steel is reduced by 43% before and after passing through the tundish, and the temperature of the molten steel drops by 11°C.

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Abstract

The invention provides a tundish covering agent for continuous casting of low-carbon steel containing Al and Ti and an application thereof. The tundish covering agent is prepared from, by mass, 32%-43% of CaO, 7%-14% of SiO2, 25%-32% of Al2O3, 6%-14% of MgO, 6%-13% of (Na2O+Li2O), 3%-7% of B2O3, 0.5%-1.5% of C and 1.1%-2% of TiO2. The tundish covering agent is low in melting temperature and viscosity and high in alkalinity. The tundish covering agent has the advantages that the tundish covering agent is suitable for continuous casting of the low-carbon steel containing Al and Ti, the mass percentage of C is smaller than or equal to 0.1%, the content of Al is smaller than or equal to 0.5%, and the content of Ti is smaller than or equal to 0.5%, inclusions in the low-carbon steel containing Al and Ti can be efficiently absorbed, the cleanliness of molten steel in a tundish is increased, secondary oxidation of the molten steel is well avoided, recarburization is avoided, the quality of a casting blank is improved, and meanwhile good thermal insulation performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of continuous casting of iron and steel, and relates to an Al and Ti-containing low-carbon steel continuous casting tundish covering agent and an application thereof. Background technique [0002] Tundish covering agent is an important functional material in the continuous casting process. The tundish covering agent plays an important role in heat insulation and heat preservation in the continuous casting tundish, preventing crusting on the liquid surface, isolating air, preventing secondary oxidation of molten steel, and absorbing non-metallic inclusions. The smooth progress and steel quality have a great impact. [0003] Adding alloying elements to steel is a common method to improve the quality of steel, but adding alloying elements also has adverse effects on its production process. Al and Ti elements in low-carbon steel containing Al and Ti are in the process of contacting the molten tundish covering ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 周乐君王万林朱晨阳李静文罗志灿
Owner CENT SOUTH UNIV
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