Method for producing stainless steel powder containing nitrogen/ high nitrogen by adopting gas atomization method

Abstract

The present invention belongs to the field of powder metallurgy technology, and is especially one atomizing process for preparing nitrogen-containing stainless steel powder. The process of preparing nitrogen-containing stainless steel powder includes the following steps: preparing materials based on the designed alloy components, preparing high nitrogen alloy, smelting the other components to obtain molten steel, adding high nitrogen alloy to the molten steel, further heating to 1500-1750 deg.c, atomizing with nitrogen in the pressure of 1.0-10 MPa as the atomizing medium, cooling to obtain powder, sieving and vacuum packing the nitrogen-containing stainless steel powder. The process has simple apparatus, easy operation, high production efficiency, low cost and other advantages, and can produce nitrogen-containing stainless steel powder with high purity, controllable nitrogen content and high flowability.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, in particular to a method for preparing nitrogen-containing / high-nitrogen stainless steel powder by gas atomization. Background technique [0002] In the late 1930s and 1940s, the shortage of nickel resources stimulated the research on the preparation of stainless steel by substituting nickel with nitrogen. The researchers found that nitrogen can not only improve the strength of steel materials, but also has an important effect on improving the corrosion resistance of materials, especially the resistance to chloride ion pitting corrosion. In addition, foreign studies in recent years have shown that nickel ions are a potential sensitizing factor, which can induce toxic effects, cell destruction and inflammatory reactions near implants in living organisms, and are teratogenic and carcinogenic to living organisms. 10-20% of women and 6% of men in the US and Europe are affected by nickel ions. ([1]...

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Problems solved by technology

[0010] The disadvantage of high-pressure nitrogen smelting-nitrogen atomization method is that high-pressure equipment is required, and there are disadvantages such as expensive and complicated equipment, high-pressure danger, difficult process control and high production cost.

[0011] The disadvantage of the fluidized bed powder nitriding method is that the microstructure of the nitriding powder is uneven, the oxygen content is high, and the energy consumption is high; the disadvantage of the mechanical alloying method is that the powder morphology is lamellar, the fluidity is poor, and the nitrogen content is not easy to control

[0012] In order to solve the problems in the production of nitrogen-containing stainless steel, such as expensive and complex equipment, high-pressure danger, difficult process control, high production cost, and poor powder fluidity, and to avoid other problems in the preparation of nitrogen-containing / high-nitrogen stainless steel powder, the present invention proposes a Method for preparing nitrogen-containing / high-nitrogen stainless steel powder by gas atomization process

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