A kind of mold slag for continuous casting mold for boron-containing steel

A continuous casting crystallizer and mold slag technology, which is applied in the field of metal smelting auxiliary materials, can solve problems such as cracks at the edge of the billet and high sensitivity to cracks in boron-containing steel, achieve good lubrication performance, overcome the friction of the billet, and improve stability sexual effect

Active Publication Date: 2016-08-24
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the crack sensitivity of boron-containing steel is strong, and a small change in boron content will cause large defects in the billet, such as cracks at the edge of the billet, which has also become a huge problem restricting the development of boron-containing steel in the domestic iron and steel industry. bottleneck

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] For the continuous casting mold mold powder for boron-containing steel produced by Factory A, it is made of the following raw materials in parts by weight: 4 parts of glass powder, 48 parts of premelt, 28 parts of wollastonite, 2 parts of carbon black, and 4 parts of graphite parts, 6 parts of sodium carbonate, 3.5 parts of sodium fluoride, 3.5 parts of bauxite, 2.5 parts of lightly burned magnesia, 5.5 parts of boron carbide, and 1.2 parts of binder.

[0026] Wherein, the composition and weight percent of the premelt used in the present invention consist of: SiO 2 42~45%, CaO36~39%, MgO1.5~3.5%, Fe 2 o 3 Not more than 1%, Al 2 o 3 4~6%, Na 2 O5~7%, F2~4%. In addition, conventional adhesives in the field such as dextrin can be used as the adhesive.

[0027] The physical properties of the mold slag for continuous casting molds for boron-containing steel in this embodiment are: basicity CaO / SiO 2 It is 1.14, the melting point is 1065°C, and the viscosity at 1300°C ...

Embodiment 2

[0030] For the continuous casting mold mold powder for boron-containing steel produced by Plant B, it is made of the following raw materials in parts by weight: 4 parts of glass powder, 45 parts of premelt, 29 parts of wollastonite, 2 parts of carbon black, and 4 parts of graphite parts, 7 parts of sodium carbonate, 3 parts of sodium fluoride, 2.5 parts of bauxite, 3 parts of lightly burned magnesia, 5 parts of boron carbide, and 1.2 parts of binder.

[0031] Wherein, the composition and weight percent of the premelt used in the present invention consist of: SiO 2 42~45%, CaO36~39%, MgO1.5~3.5%, Fe 2 o 3 Not more than 1%, Al 2 o 3 4~6%, Na 2 O5~7%, F2~4%. In addition, conventional adhesives in the field such as dextrin can be used as the adhesive.

[0032] The physical properties of the mold slag for continuous casting molds for boron-containing steel in this embodiment are: basicity CaO / SiO 2 It is 1.12, the melting point is 1045°C, and the viscosity at 1300°C is 0.42P...

Embodiment 3

[0035]For the continuous casting mold powder for boron-containing steel produced by Plant C, it is made of the following raw materials in parts by weight: 5 parts of glass powder, 50 parts of premelt, 27 parts of wollastonite, 2 parts of carbon black, and 5 parts of graphite parts, 5 parts of sodium carbonate, 4 parts of sodium fluoride, 3.5 parts of bauxite, 2 parts of lightly burned magnesia, 6 parts of boron carbide, and 1.2 parts of binder.

[0036] Wherein, the composition and weight percent of the premelt used in the present invention consist of: SiO 2 42~45%, CaO36~39%, MgO1.5~3.5%, Fe 2 o 3 Not more than 1%, Al 2 o 3 4~6%, Na 2 O5~7%, F2~4%. In addition, conventional adhesives in the field such as dextrin can be used as the adhesive.

[0037] The physical properties of the mold slag for continuous casting molds for boron-containing steel in this embodiment are: basicity CaO / SiO 2 It is 1.13, the melting point is 1055°C, and the viscosity at 1300°C is 0.41Pa·s. ...

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Abstract

The invention belongs to the technical field of auxiliary materials for metal smelting and relates to continuous casting mold flux for boron containing steel. The continuous casting mold flux for the boron containing steel is prepared from, by weight, 3-7 parts of glass powder, 40-55 parts of premelting materials, 27-35 parts of aedelforsite, 2 parts of carbon black, 4-5 parts of graphite, 5-9 parts of sodium carbonate, 2.5-5.5 parts of sodium fluoride, 2-4 parts of bauxite, 2-5 parts of caustic calcined magnesite, 5-8 parts of boron carbide and 1.2 parts of binding agent. For crack sensitivity of the boron containing steel, selection, basicity, viscosity and melting point of raw materials of the continuous casting mold flux are controlled comprehensively, so that crack sensitivity of the boron containing steel is improved effectively, and the problems of cracks at edges of the surface of the boron containing steel is solved.

Description

technical field [0001] The invention belongs to the technical field of metal smelting auxiliary materials, and in particular relates to a mold slag for continuous casting molds for boron-containing steel. Background technique [0002] Boron-containing steel refers to steel containing a certain amount of boron, wherein the boron content is 0.001%-0.003%. [0003] my country is rich in boron resources, and adding a small amount of boron to molten steel can increase the hardenability of steel, and can also replace Mo, Cr, Ti and other precious elements to save resources. At the same time, special steel enjoys a certain tax rebate advantage in terms of export, so boron steel has now become a steel type that the domestic steel industry is focusing on developing. [0004] Boron-containing steel is mainly used as structural steel because of its high hardenability and fatigue resistance. In addition, it can also be used as spring steel, cold deformed steel, wear-resistant steel, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 张福王旭阳马帅王正英梁冠东庞炎庞天敏
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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