Stainless steel powder machining technology

A technology of stainless steel powder and processing technology, applied in the field of powder metallurgy, which can solve the problems of affecting the surface smoothness of powder particles, easily scratching molds, and decarburization of products, and achieve the effect of reducing the risk of being oxidized

Active Publication Date: 2019-05-14
石家庄京元粉末材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the processing of metal powder, the metal or alloy melt is easily oxidized by the atmosphere, and the generated oxide enters the metal powder in the water atomization pulverization process, which directly affects the smoothness of the powder particle surface, and the higher the oxygen content , the fluidity of metal powder is worse
Oxygen in water atomized metal powder mainly exists in the form of oxides. These oxides are much harder than pure iron and are easy to scratch the mold during molding. Moreover, during sintering, the oxides are reduced by high temperature, which increases the pores of the product. , the product is seriously decarburized, and the metallographic structure deteriorates, which affects the performance of the product

Method used

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  • Stainless steel powder machining technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of processing technology of stainless steel powder, concrete processing steps are as follows:

[0037] (1) Melting: Add solid stainless steel of the type to be processed into the intermediate frequency furnace, heat to melt the solid stainless steel; then add cullet with smaller particle size into the furnace from the furnace mouth of the intermediate frequency furnace, and melt the surface of the molten liquid Completely cover, covering thickness is 3cm, plays the protective effect of isolating oxygen; Continue to heat and smelt until cullet and solid stainless steel all melt; Wherein, the finer the cullet is, the more favorable the protective effect of blocking air is played to stainless steel, in the present invention The broken glass slag with a particle size of 0.5-1.5cm is used;

[0038] (2) Water atomization pulverization: such as figure 1 As shown, the tundish in the present invention includes an internal quartz crucible 1 and a heating jacket 2 wrapped ...

Embodiment 2

[0044] The difference between the processing technology of Example 2 and Example 1 is that in step (1), the amount of cullet added is controlled at a thickness of 1 cm, and the rest is consistent with Example 1. The stainless steel powder of Example 2 is obtained, and its oxygen content is measured. It is 1670ppm.

Embodiment 3

[0046] The difference between the processing technology of Example 3 and Example 1 is that in step (1), the amount of cullet added is controlled at a thickness of 2 cm, and the rest is consistent with Example 1. The stainless steel powder of Example 3 is obtained, and its oxygen content is measured. 1700ppm.

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PUM

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Abstract

The invention relates to the technical field of powder metallurgy, in particular to a stainless steel powder machining technology. The stainless steel powder machining technology comprises the following machining steps that smelting is conducted, specifically, solid stainless steel is added into an intermediate frequency furnace and heated to be melted; glass cullet is added on the surface layer of molten stainless steel through a furnace opening of the intermediate frequency furnace, so that the surface layer of the molten stainless steel is completely covered with the glass cullet; heating and smelting continue being conducted till the glass cullet and the solid stainless steel are all melted; water atomization powder manufacturing is conducted, specifically, the molten stainless steel is poured into a tundish, flows into a high-pressure spray disc from the bottom of the tundish and falls into an atomization barrel after flowing out from the high-pressure spray disc; in the atomization barrel, high-pressure water sprayed out from the high-pressure spray disc impacts a molten stainless steel column, and the molten stainless steel column is broken into stainless steel powder; and dehydration and drying are conducted, specifically, the stainless steel powder is subjected to dehydration and drying in sequence, and the product stainless steel powder is obtained. By adopting the machining technology, the risk that the stainless steel powder is oxidized can be reduced, and accordingly, the oxygen content of the stainless steel powder is reduced.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to a processing technology of stainless steel powder. Background technique [0002] Atomization method is a common method for preparing metal powder. This method uses water or inert gas to crush metal or alloy melt to obtain powder. Among them, water atomization is called water atomization. Water atomization is based on Water is used as the atomization medium. Because the heat capacity ratio of water is much larger than that of gas, it has a strong cooling ability for metal droplets. Therefore, the shape of metal powder particles produced by water atomization is irregular, and it has good compressibility and formability. . [0003] However, during the processing of metal powder, the metal or alloy melt is easily oxidized by the atmosphere, and the generated oxide enters the metal powder in the water atomization pulverization process, which directly affects the smoothness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08
Inventor 张英川
Owner 石家庄京元粉末材料有限责任公司
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