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Covering agent for pouring basket in high alkalinity

A tundish, high alkalinity technology, applied in the field of tundish covering agent, can solve the problems of easy carburization of molten steel, unsatisfactory capacity, unsuitable for the production of steel types with S requirements, etc., achieve good thermal insulation performance, and prevent secondary Oxidation, effect of improving slab quality

Inactive Publication Date: 2007-04-04
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Disadvantages: for protection and absorption of Al 2 o 3 The capacity is not ideal, the molten steel is easy to carburize or absorb hydrogen
[0012] Disadvantages: Poor insulation effect
[0015] Disadvantages: Insulate the air, and the effect of preventing the secondary oxidation of molten steel is poor
For example, U.S. Patents US6174347B1 and US6179895B1 are high-basic tundish covering agents, but they use the slag refined by the Ladle Metallgy Furnace as the main raw material, and the content of impurity elements such as S in this material Relatively high, not suitable for the production of steel grades that require S

Method used

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  • Covering agent for pouring basket in high alkalinity
  • Covering agent for pouring basket in high alkalinity
  • Covering agent for pouring basket in high alkalinity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] See Table 2 for examples and comparative examples of the high alkalinity tundish covering agent of the present invention.

[0042]

Example

Composition (mass percentage)

Alkalinity

Effect

calcium aluminate

calcium carbonate

Magnesia

Quartz sand

binder

Admixture

lining erosion

1

87.1

3.9

0.1

1.9

6.0

1.0

8.51

Nothing serious

2

89.9

0.3

2.2

4.5

1.7

1.4

6.00

Nothing serious

3

71.2

24.1

0.8

3.0

0.1

0.8

10.71

Nothing serious

4

72.3

3.6

14.2

0.7

9.1

0.1

12.10

Nothing serious

5

73.5

21.3

2.8

0.9

0.3

1.2

11.18

Nothing serious

6

75.5

7.2

11.0

1.1

3.0

2.2

16.48

N...

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Abstract

A high-basicity covering agent for the tundish to decrease O2 and S from molten steel, and prevent secondary oxidizing is proportionally prepared from the calcium aluminate prepared from calcium carbonate and bauxite, magnesium sand, adhesive chosen from dextrin, wheat flour and water glass, additive chosen from phosphate, lignosulfonate, citric acid glycerine, etc, calcium carbonate and quartz sand.

Description

technical field [0001] The invention relates to an auxiliary material for continuous casting in steelmaking, in particular to a tundish covering agent. Background technique [0002] The tundish for storing and transporting molten steel is a transitional reactor in the metallurgical process. It is used to distribute the molten steel transported by the ladle to the mold, stabilize the pouring speed, reduce the impact momentum of the injection flow in the mold, and remove steel. Ideal place for inclusions in the water. [0003] The tundish covering agent is a granular or powder artificial synthetic auxiliary material added on the molten steel surface of the tundish. Isolate air to prevent secondary oxidation of molten steel; (3) Absorb non-metallic inclusions floating on the surface of molten steel. [0004] At present, the commonly used tundish covering agents are divided into three categories: acid slag, neutral slag and alkaline slag. The specific types and components are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 王妍陈荣欢朱立新朱祖民
Owner BAOSHAN IRON & STEEL CO LTD
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