A heating-type casting slag for continuous casting of rectangular billets

A technology for pouring slag and rectangular blanks, which is applied in the field of steelmaking auxiliary materials, can solve the problems of low casting speed, easy freezing of crystallizers, and rapid slag formation of mold slag, so as to achieve high heat generation rate, improve purity, and avoid The Effect of Cooling Steel on the Liquid Surface of Mold Steel

Active Publication Date: 2016-08-24
HENAN TONGYU METALLURGY MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When continuous casting starts, the mold slag can prevent the oxidation of molten steel and lubricate the slab, but the mold slag for the "body" designed according to the normal casting speed cannot meet the requirements of rapid slag formation at the start of casting, and due to the Due to low casting speed, long residence time of molten steel in the mold, low temperature, and melting and heat absorption of mold slag, the molten steel surface of the mold is prone to cold steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A heating-type casting slag for continuous casting of a rectangular billet is made of the following raw materials in parts by weight: 50 parts of wollastonite with a particle size of ≤45 μm, 22 parts of coke with a particle size of ≤50 μm, 22 parts of sodium carbonate, and 1 part of lithium carbonate Parts, 4 parts of aluminum powder with a particle size of ≤75 μm, and 1 part of expanded graphite with a particle size of ≤300 μm.

[0024] Wherein, the SiO in the wollastonite 2 The weight percentage of CaO is 53±2.0%, and the weight percentage of CaO is 44±2.0%. The weight percent content of C in the coke is 80±3.0%. Na in the sodium carbonate 2 CO 3 The weight percentage is greater than 98%. Li in the lithium carbonate 2 CO 3 The weight percentage is greater than 98%. The weight percentage of Al in the aluminum powder is greater than 96%. The expansion ratio of the expanded graphite is greater than 120 times.

[0025] It has been tested that the above-mentioned ...

Embodiment 2

[0028] A heating-type casting slag for continuous casting of a rectangular billet is made of the following raw materials in parts by weight: 60 parts of wollastonite with a particle size of ≤45 μm, 16 parts of coke with a particle size of ≤50 μm, and 17 parts of sodium carbonate with a particle size of ≤ 1 part of 75 μm aluminum powder, 3 parts of expanded graphite with particle size ≤300 μm.

[0029] Wherein, the SiO in the wollastonite 2 The weight percentage of CaO is 53±2.0%, and the weight percentage of CaO is 44±2.0%. The weight percent content of C in the coke is 80±3.0%. Na in the sodium carbonate 2 CO 3 The weight percentage is greater than 98%. Li in the lithium carbonate 2 CO 3 The weight percentage is greater than 98%. The weight percentage of Al in the aluminum powder is greater than 96%. The expansion ratio of the expanded graphite is greater than 120 times.

[0030] It has been tested that the above-mentioned heat-generating casting slag for continuous ...

Embodiment 3

[0033] A heating-type casting slag for continuous casting of rectangular billets is made of the following raw materials in parts by weight: 70 parts of wollastonite with a particle size of ≤45 μm, 12 parts of coke with a particle size of ≤50 μm, 12 parts of sodium carbonate, and 3 parts of lithium carbonate Parts, 6 parts of aluminum powder with a particle size of ≤75 μm, and 2 parts of expanded graphite with a particle size of ≤300 μm.

[0034] Wherein, the SiO in the wollastonite 2 The weight percentage of CaO is 53±2.0%, and the weight percentage of CaO is 44±2.0%. The weight percent content of C in the coke is 80±3.0%. Na in the sodium carbonate 2 CO 3 The weight percentage is greater than 98%. Li in the lithium carbonate 2 CO 3 The weight percentage is greater than 98%. The weight percentage of Al in the aluminum powder is greater than 96%. The expansion ratio of the expanded graphite is greater than 120 times.

[0035] After inspection, the above-mentioned exoth...

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Abstract

The invention provides a heating start powder for continuous casting of a rectangular billet and belongs to the technical field of steel-making auxiliary materials. According to the technical scheme, the heating start powder for continuous casting of the rectangular billet is made of wollastonite which is smaller than or equal to 45mum in grain diameter, coke which is smaller than or equal to 50mum in grain diameter, sodium carbonate, lithium carbonate, aluminum powder which is smaller than or equal to 75mum in grain diameter and expanded graphite which is smaller than or equal to 300mum in grain diameter. By means of the heating start powder for continuous casting of the rectangular billet, fast slag forming can be achieved, good thermal insulation property and high heating rate are achieved, defects such as concaving and scarring of head slabs can be effectively prevented, cold steel can be prevented from being formed on a liquid steel surface of a crystallizer, stable, continuous and good lubrication effects can be provided for start of continuous casting of the rectangular billet, and the qualified rate of casting blanks is effectively increased.

Description

technical field [0001] The invention belongs to the technical field of steelmaking auxiliary materials, and in particular relates to a heating type casting slag for continuous casting of rectangular billets. Background technique [0002] At present, although China's steel production and consumption have maintained a growth trend, the growth rate has slowed down, and the steel production capacity is severely oversupplied; the price of raw materials and fuels is running at a high level, coupled with the impact of the global economic situation, the benefits of the steel industry have been greatly reduced. Various steel mills have responded to the sluggish market situation by saving energy and reducing consumption and improving product quality. [0003] When continuous casting of rectangular billets, especially large cross-section rectangular billets, the casting speed is kept at a low casting speed for a long period of time. The first billet was cut off and returned to the fur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 张国令陈守杰封彦磊朱世嘉唐红波
Owner HENAN TONGYU METALLURGY MATERIALS GRP
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