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Covering agent for dead head of caste steel

A covering agent and steel casting technology, which is applied in the direction of casting molds, casting mold components, casting molding equipment, etc., can solve the problems that the cast steel riser covering agent cannot meet the casting requirements of steel castings, so as to ensure the production rate of the process and reduce the Height, save the effect of molten steel

Inactive Publication Date: 2018-01-19
HEFEI ZHENGMING MACHINERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the development of casting technology and the continuous improvement of the quality requirements of steel castings, the traditional cast steel riser covering agent is increasingly unable to meet the casting requirements of steel castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A cast steel riser covering agent is made of the following components in terms of mass percentage: silicon oxide accounts for 25%, calcium oxide accounts for 15%, sodium oxide accounts for 10%, calcium fluoride accounts for 5.0%, magnesium oxide accounts for 4.5%, Potassium oxide accounts for 3.5%, boron nitride accounts for 3.5%, titanium oxide accounts for 2.5%, iron oxide accounts for 2.0%, zirconium oxide accounts for 1.5%, yttrium oxide accounts for 1.0%, and the rest is carbon, of which titanium oxide and iron oxide are nanometer Grade, the remaining raw materials are crushed to 20 microns, mixed in a mixer for 15 minutes, and dried at 120 ° C for 3 hours. one.

[0017] As a further improvement to the above scheme, the preparation method of the nanoscale titanium oxide is:

[0018] (1) React 1 kg of metatitanic acid with a purity of 99.5-99.9% after washing with water and sulfuric acid with a mass concentration of 60%, the reaction molar ratio is 1:1.3, the react...

Embodiment 2

[0024] A cast steel riser covering agent is made of the following components in terms of mass percentage: silicon oxide accounts for 28%, calcium oxide accounts for 18%, sodium oxide accounts for 11%, calcium fluoride accounts for 5.5%, magnesium oxide accounts for 5.0%, Potassium oxide accounts for 4.0%, boron nitride accounts for 3.8%, titanium oxide accounts for 2.8%, iron oxide accounts for 2.5%, zirconium oxide accounts for 1.8%, yttrium oxide accounts for 1.2%, and the rest is carbon, of which titanium oxide and iron oxide are nanometer Grade, the remaining raw materials are crushed to 25 microns, mixed in a mixer for 18 minutes, and dried at 125°C for 4 hours. one.

[0025] As a further improvement to the above scheme, the preparation method of the nanoscale titanium oxide is:

[0026] (1) React 1 kg of metatitanic acid with a purity of 99.5-99.9% after washing with water and sulfuric acid with a mass concentration of 65%, the reaction molar ratio is 1:1.4, the reactio...

Embodiment 3

[0032] A cast steel riser covering agent is made of the following components in terms of mass percentage: 30% silicon oxide, 20% calcium oxide, 12% sodium oxide, 6.0% calcium fluoride, 5.5% magnesium oxide, Potassium oxide accounts for 4.5%, boron nitride accounts for 4.0%, titanium oxide accounts for 3.0%, iron oxide accounts for 3.0%, zirconium oxide accounts for 2.0%, yttrium oxide accounts for 1.5%, and the rest is carbon, of which titanium oxide and iron oxide are nanometer Grade, the remaining raw materials are crushed to 30 microns, mixed in the mixer for 20 minutes, and dried at 130°C for 5 hours. When the molten steel rises to 40% of the height of the riser, put in the covering agent, and the input ratio is 1,000 parts one.

[0033] As a further improvement to the above scheme, the preparation method of the nanoscale titanium oxide is:

[0034] (1) React 1 kg of metatitanic acid with a purity of 99.5-99.9% after washing with water and sulfuric acid with a mass concen...

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Abstract

The invention relates to the technical field of cast steel, and discloses a covering agent for a dead head of caste steel. The covering agent comprises the following components of, by mass, 25-30% ofsilicon oxide, 15-20% of calcium oxide, 10-12% of sodium oxide, 5.0-6.0% of calcium fluoride, 4.5-5.5% of magnesium oxide, 3.5-4.5% of potassium oxide, 3.5-4.0% of boron nitride, 2.5-3.0% of titaniumoxide, 2.0-3.0% of iron oxide, 1.5-2.0% of zirconium oxide, 1.0-1.5% of yttrium oxide, and the balance carbon. According to the covering agent for the dead head of the caste steel, start with changingchemical compositions of the covering agent, the physical and chemical properties of the covering agent are improved, the problem of heat loss on the top of the dead head is solved, the solidification speed of molten steel in the dead head is prolonged, so that the feeding capacity of the molten steel in the dead head is improved; and the technological yield of castings is ensured, the height ofthe dead head is reduced, the molten steel is saved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of cast steel, and in particular relates to a cast steel riser covering agent. Background technique [0002] With the continuous improvement and development of casting technology and the increasingly serious energy problems, the foundry industry itself must develop faster in technology development and quality improvement. In the casting process of cast steel, the use of cast steel riser covering agent can slow down the cooling rate of molten steel in the riser, improve the feeding ability of riser molten steel to steel castings, thereby reducing the amount of molten steel and improving the quality and yield of castings , In our country, casting has a long history. The use of cast steel riser covering agent began in the 1970s. It is closely related to the development of continuous casting technology. Cast steel is used for production without undergoing eutectic transformation during solidification. The gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/08
Inventor 周正明
Owner HEFEI ZHENGMING MACHINERY CO LTD
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