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Miniature alloy steel shot preparation method

A kind of alloy steel, fine technology, applied in the field of preparation of fine alloy steel shot, can solve the problems of increased oxidation rate, rough product surface, poor product sphericity, etc., reduce the tendency of oxidation and corrosion reaction, improve surface strength and Service life, the effect of eliminating the brightening treatment process

Active Publication Date: 2014-12-03
连云港倍特超微粉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this method is used in the production of fine alloy steel shot, it is prone to the phenomenon that the sphericity of the product is not good, there are many irregular particles, and the yield rate is not high.
When the traditional centrifugal pelletizing method is used to produce fine alloy steel shots, as the alloy steel molten droplets become smaller, the oxidation rate increases rapidly, and the product yield drops sharply, especially when using this equipment to produce fine alloy steel shots with a particle size of less than 0.5mm. For alloy steel shot, the product rate is less than 40%
In actual production, it is also found that the surface strength of alloy steel shot products deteriorates, which affects the service life.
In addition, due to the small particles of the fine alloy steel shot and the large specific surface area, the corrosion reaction will occur after staying in the cooling water for 2 hours, the surface of the product will become rough, and the color will turn red, which will affect the quality of the product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The raw materials for preparing alloy steel shots are put into an intermediate frequency melting furnace for melting and smelting to obtain alloy steel molten liquid. Open the valve of the nitrogen cylinder, feed nitrogen into the pelletizing device, make the oxygen content in the gas in the device reach 0.1% (volume), and keep the flow rate of continuously feeding nitrogen at 1m 3 / h. Add water to the specified liquid level in the pond, and add 17% (weight) of concentrated ammonia water therein, making the ammonia content in the water be 0.5% (weight). The speed of the centrifugal disc in the pill maker is controlled at 700 rpm. The alloy steel melt is added to the melt tundish, and the alloy steel melt is continuously added to the centrifugal disc through the melt tundish. After being thrown out by the centrifugal disc, the alloy steel molten liquid is cooled during the flight, and becomes spherical by surface tension, and then falls into the pool to obtain fine allo...

Embodiment 2

[0030] The raw materials for preparing alloy steel shots are put into an intermediate frequency melting furnace for melting and smelting to obtain alloy steel molten liquid. Open the valve of the nitrogen cylinder, feed nitrogen into the pelletizing device, make the oxygen content in the gas in the device reach 0.08% (volume), and keep the flow rate of continuously feeding nitrogen at 3m 3 / h. Add water to the specified liquid level in the pool, and add 17% (weight) of concentrated ammonia water to it, so that the ammonia content in the water is 1.0% (weight). The rotational speed of the centrifugal disc in the pill making machine is controlled at 900 rpm. The alloy steel melt is added to the melt tundish, and the alloy steel melt is continuously added to the centrifugal disc through the melt tundish. After being thrown out by the centrifugal disc, the molten alloy steel is cooled during the flight, and becomes spherical by surface tension, and then falls into the pool. The ...

Embodiment 3

[0032] The raw materials for alloy steel shot preparation are put into the intermediate frequency melting furnace for melting and smelting. Open the valve of the nitrogen cylinder, feed nitrogen into the pelletizing device, make the oxygen content in the gas in the device reach 0.06% (volume), and keep the flow rate of continuously feeding nitrogen at 5m 3 / h. Add water to the specified liquid level in the pool, and add 17% (weight) of concentrated ammonia water therein, making the ammonia content in the water 2.0% (weight). The speed of the centrifugal disc in the pill maker is controlled at 1100 rpm. The alloy steel melt is added to the melt tundish, and the alloy steel melt is continuously added to the centrifugal disc through the melt tundish. After being thrown out by the centrifugal disc, the alloy steel molten liquid is cooled during the flight, and becomes spherical by surface tension, and then falls into the pool to obtain fine alloy steel shot products. The average...

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Abstract

The invention relates to a miniature alloy steel shot preparation method. The rotational speed of a centrifugal disc is regulated to regulate granularity of alloy steel shots. A whole device is airtight, nitrogen is fed into the device to change gaseous environment in a centrifugal spot making machine, and accordingly oxygen content and oxidation of high-temperature molten droplets during cooling are reduced. Ammonia is added into cooling water of a pool to change potential of hydrogen of the cooling water and reduce oxidation of finished products in water. Besides, by the aid of vaporization of the ammonia, a reducing gas environment in the device is formed, oxidation is further reduced, rate of the finished products is increased, crystalline perfection of alloy steel shot surfaces and surface strength are improved, and service life is prolonged.

Description

technical field [0001] The invention belongs to the field of metal manufacturing, and in particular relates to a preparation method of fine alloy steel shots. Background technique [0002] In the field of metal casting, it is a common surface treatment method to remove burrs, derust and polish metal castings through shot blasting and shot blasting. Among them, the most used shot blasting material is alloy steel shot. Alloy steel shot with particle size less than 1.0mm is called fine alloy steel shot, which is especially suitable for shot blasting of precision castings. [0003] The basic principle of preparing alloy steel shot is to use a certain form and size of energy to crush the molten steel with cohesive force, so that the crushed steel liquid will shrink into pellets by its own surface tension during the cooling and solidification process. There are two commonly used preparation methods: one is the water jet method, which disperses the molten alloy steel into small dr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/10
Inventor 胡永其孟令光
Owner 连云港倍特超微粉有限公司