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A process for preparing stainless steel powder

A process method and stainless steel technology, applied in the field of powder metallurgy, can solve the problems of unguaranteed product quality, low fluidity, and low purity of stainless steel powder.

Active Publication Date: 2020-09-08
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the problems existing in the prior art, the embodiment of the present invention provides a process method for preparing stainless steel powder, which is used to solve the problem that the prepared stainless steel powder has a large amount of impurities in the stainless steel when preparing stainless steel powder in the prior art. The purity is low and the fluidity is not high, which leads to the technical problem that the quality of the product prepared based on the stainless steel powder cannot be guaranteed

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  • A process for preparing stainless steel powder
  • A process for preparing stainless steel powder
  • A process for preparing stainless steel powder

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Embodiment 1

[0030] This embodiment provides a kind of processing method for preparing stainless steel powder, such as figure 1 As shown, the method includes:

[0031] S101, obtaining super fine iron ore, and reducing the super fine iron ore to sponge iron;

[0032] In order to avoid impurities in scrap steel and improve powder purity, this embodiment obtains super fine iron ore, uses super fine iron ore as a preparation raw material, and reduces the super fine iron ore to sponge iron. The mass percentage of each chemical component in the super fine iron ore includes: TFe≧70%, SiO 2 %≦2.0%, S≦0.1%, P≦0.1%; the super fine iron ore includes: the first fine iron ore with a particle size of 2-5 cm and the second fine iron ore with a particle size of ≧5 cm. The mass percentage of the first fine iron ore is 80-85%; the mass percentage of the second fine iron ore is 15-20%.

[0033] Here, hydrogen is used as the reducing gas, and the super fine iron ore is reduced to the sponge iron by using a...

Embodiment 2

[0050] In practical application, when using the method provided in Example 1 to prepare 316L stainless steel powder, the specific implementation is as follows:

[0051] In order to avoid impurities in scrap steel and improve powder purity, this embodiment obtains super fine iron ore, uses super fine iron ore as a preparation raw material, and uses non-blast furnace ironmaking process to reduce the super fine iron ore to sponge iron.

[0052] Wherein, the non-blast furnace ironmaking process uses fine iron ore, fly ash, and limestone to directly reduce molten iron in a reducing atmosphere of hydrogen, and the molten iron is smelted into stainless steel after carburizing (reaction with fly ash) It eliminates the coking, sintering, blast furnace ironmaking, and converter steelmaking processes of traditional steelmaking, thereby avoiding environmental pollution. The mass percentage of the fine iron ore is 95%, the mass percentage of the fly ash is 3%, and the mass percentage of th...

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Abstract

The embodiment of the invention provides a process method for preparing stainless steel powder. The method comprises the following steps: reducing super refined iron ore to sponge iron, wherein the super refined iron ore comprises the following chemical compositions in percentage by mass: TFe greater than or equal to 70 percent, SiO2 less than or equal to 2.0 percent, S less than or equal to 0.1 percent and P less than or equal to 0.1 percent; in a reducing atmosphere, vacuumizing and melting the sponge iron by utilizing 3D-printed vacuum gas atomization equipment to obtain molten iron; carrying out vacuum melting on the molten iron to obtain molten steel; carrying out gas atomization on the molten steel by utilizing the 3D-printed vacuum gas atomization equipment to obtain metal powder; and cooling the metal powder by utilizing nitrogen and carrying out magnetic separation and screening on the cooled metal powder to obtain powder products. According to the method, when the sponge ironis molten by utilizing the 3D-printed vacuum gas atomization equipment, impurities in the molten material can be oxidized and removed through a small amount of Fe2O3 in the sponge iron, so that the purity of the powder is further increased.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a process for preparing stainless steel powder. Background technique [0002] Stainless steel powder is the most demanded metal powder product in the market, accounting for about 50% of the market demand. In the prior art, stainless steel powder is generally prepared by using scrap steel as a raw material, but some types of stainless steel are mainly used in pulp and papermaking equipment heat exchangers, dyeing equipment, film washing equipment, pipelines, etc.; also used in small electromagnetic valves parts and more. During the use of steel, various dirt is often attached to the surface of the material. In addition, small parts used for valves are also difficult to decompose, resulting in mixed scrap steel and many impurities in the market. Therefore, the purity and fluidity of the stainless steel powder prepared based on the scrap steel are affected to a certain e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/08C22C33/06C22C38/44C22C38/04C22C38/02
CPCB22F9/082B22F2009/0848C22C33/06C22C38/02C22C38/04C22C38/44
Inventor 康凌晨李丽坤韩斌杨钰焦立新卢丽君周许林刘继雄彭周
Owner 武汉钢铁有限公司