Stainless steel powder machining technology

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 ...

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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

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