MIM uses 420 stainless steel powder and its water-gas combined atomization powder making method

Abstract

The invention discloses a water-gas combined atomization powder-making method of 420 stainless steel powder for MIM, which belongs to the field of alloy materials, and its elements are as follows by weight percentage: C: 0.5-0.6%, Si≤1.0%, Mn: 0.7-0.6%. 1.5%, N: 0.1‑0.7%, Cr: 12.0‑14.0%, Ni: 1.0‑3.0%, Mo: 0.5‑1.5%, Co: 0.1‑0.5%, Nb: 0.5‑1.5%, the balance being Fe and Impurities. The intermediate frequency induction furnace is used for smelting, the intermediate frequency induction furnace is dumped, the molten steel flows into the tundish and flows out from the leak hole; the high pressure water is sprayed from the nozzle of the spray plate, focusing on the molten steel flow, breaking the molten steel into fine particles, It is cooled into metal particles during the flight; and then filtered, vacuum dried and sieved to obtain a fine powder with a particle size of less than 400 mesh. The beneficial effect of the invention is that the alloy powder prepared by the process of the invention has good sphericity. Good sphericity can enable the powder to obtain sufficient fluidity during the injection into the mold cavity of the MIM process, which can fully fill the mold cavity, and obtain a high-density injection body with small dimensional fluctuations.

Description

technical field [0001] The invention relates to the field of alloy materials, in particular to a 420 stainless steel powder and a water-gas combined atomization powder making method thereof. Background technique [0002] 420 stainless steel belongs to martensitic stainless steel, which can be divided into 420J1 (national standard GB 2Cr13) and 420J2 (national standard GB 3Cr13) according to different carbon content. 420J1 (2Cr13) does not meet the performance requirements of cutting tools due to its low hardness and tensile strength. The currently commonly used 420 generally refers to 420J2 (3Cr13). The characteristic of martensitic stainless steel is that the matrix is ​​martensite, which is magnetic, and its mechanical properties can be adjusted by heat treatment. The American Iron and Steel Institute marks martensitic stainless steel with numbers 410, 420, and 440. Martensite has an austenite structure at high temperature, and when cooled to room temperature at an appr...

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Problems solved by technology

[0015] Aiming at the problem that the 420 stainless steel powder prepared by the water atomization method in the prior art cannot meet the requirements of MIM manufacturing, the present invention provides a 420 stainless steel powder and its water-gas combined atomization powder making method, which will provide a new solution for the MIM manufacturing industry. Provide new 420 stainless steel powder with high hardness, high strength and high corrosion resistance suitable for MIM manufacturing process

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