Tundish covering flux

A covering agent and tundish technology, applied in the field of tundish covering agents, can solve the problems of poor spreadability, poor thermal insulation, increase the particle size of the covering agent, reduce the density of the covering agent, etc., so as to achieve improved purity, suitable melting point and good spreading. sexual effect

Active Publication Date: 2014-04-30
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] In the technical solution of the present invention, the inventor overcomes the defects of ordinary high-alkalinity carbon-free covering agent with poor spreadability and thermal insulation and easy to form a thick slag crust by controlling the melting speed of the tundish covering agent. To adjust the melting speed of the covering agent to an appropriate value, it is necessary to increase the melting temperature of the covering agent; reduce the density of the covering agent; increase the particle size of the covering agent

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0033] See Table 3 for the mass percentage distribution of each component of the tundish covering agent of Examples 1-5 of the present invention.

[0034] Table 3. (The balance is unavoidable impurities)

[0035]

[0036]

[0037] The physical performance parameters of the tundish covering agents of Examples 1-5 of the present invention are shown in Table 4.

[0038] Table 4.

[0039] Example

Melting point (°C)

Viscosity (Pa.S)

Bulk density (g / cm 3 )

Granularity (mm)

1

1270

1.10

0.96

0.5mm

2

1290

1.19

0.85

0.4mm

3

1300

1.25

0.73

0.3mm

4

1305

1.33

0.62

0.2mm

5

1311

1.50

0.50

0.1mm

[0040] In the above-mentioned Examples 1-5, when the first continuous casting furnace is poured and the tundish is 35 tons, the tundish covering agent is dropped into the two preheating holes and the castin...

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Abstract

The invention discloses a tundish covering flux, which comprises the following components by mass: 5-10% of CaCO3, 60-80% of CaO+SiO2, 3.0-6.0% of Al2O3, 6.0-10.0% of MgO, 1.0-3.0% of Na2O, 0-0.5% of fixed carbon, 0-10.0% of lightweight bulk material, 2-6.0% of binder, 0-0.5% of water and the balance of inevitable impurities, wherein the ratio of CaO to SiO2 is 1.1-1.5. The tundish covering flux is added into molten steel, and then a three-layer structure comprising a slag formation layer, a sintering layer and a melting layer is formed on the molten steel. The tundish covering flux does not incrust in a using process, and has a proper melting point, spreadability and high heat-preservation performance; and the excessive temperature drop of the molten steel in a tundish can be prevented, and a slag crust is prevented from being formed on the surface of the molten steel.

Description

technical field [0001] The invention relates to auxiliary materials used in the metallurgical production process, in particular to a tundish covering agent used in the steel continuous casting process. Background technique [0002] In the smelting and production process of iron and steel, when pouring steel in continuous casting, a certain amount of covering agent must be put into the tundish at the time of pouring and during casting. Oxidation, on the other hand, can maintain the proper temperature of molten steel in the tundish to ensure the smooth progress of casting. [0003] In the production of some special steel types, such as high-grade silicon steel, in order to obtain the ideal refined equiaxed grain casting structure, it is necessary to strengthen the undercooling standard of continuous casting steel, reduce the casting speed, and prolong the casting time. The covering agent currently used has a high melting point, poor spreadability, and unsatisfactory heat pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 吕宪雨胡暑名曹伟陆兴华汤效军陈锦松
Owner BAOSHAN IRON & STEEL CO LTD
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