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Method for producing spherical stainless steel powder material by using high pressure water atomization method

A high-pressure water atomization, powder material technology, applied in the fields of precision casting, powder metallurgy and injection molding, can solve the problems of hindering sintering, high cost, irregular powder shape, etc., to achieve less pollution, low production cost, high sphericity Effect

Inactive Publication Date: 2011-03-30
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water atomization method currently used is the main powder-making process, which has high efficiency and is relatively economical in large-scale production, and can make the powder finer, but the shape of the powder produced by the current process is irregular, and the oxide film formed by the high-temperature reaction of water and metal Hinders sintering and is more expensive

Method used

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  • Method for producing spherical stainless steel powder material by using high pressure water atomization method
  • Method for producing spherical stainless steel powder material by using high pressure water atomization method
  • Method for producing spherical stainless steel powder material by using high pressure water atomization method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: 304 injection molding stainless steel powder production:

[0030] 1) Prepare the required stainless steel raw materials according to the content of each element in the stainless steel powder grade (Table 1);

[0031] 2) Add the above-mentioned stainless steel raw materials into the medium frequency induction heating furnace, and the superheat of the melt is 150°C;

[0032] 3) Pour the molten metal of the above stainless steel material into the crucible, and flow it down from the tundish 2, the flow rate of the molten metal is 40g / s;

[0033] 4) Make high-pressure water spray from the nozzle of the atomizer with a water flow rate of 3.5 m 3 / min, the atomizer nozzle is a multi-focus jet double-layer annular nozzle, in which two main nozzles 4 and two sub-nozzles 6 are set, the spray angle α of the first focal point 7 is 17°, and the high-pressure water pressure is 50 Mpa, the spray angle θ of the second focal point 8 is 15°, and the high pressure water pr...

Embodiment 2

[0038] Example 2: Production of 316L injection molding stainless steel powder

[0039] 1) Prepare the required stainless steel raw materials according to the content of each element in the stainless steel powder grade (Table 1);

[0040] 2) Add the above-mentioned stainless steel raw materials into the medium frequency induction heating furnace, and the superheat of the melt is 180°C;

[0041] 3) Pour the molten metal of the above stainless steel material into the crucible 1 so that it flows down from the tundish 2, and the flow rate of the molten metal is medium 45g / s;

[0042] 4) Make high-pressure water spray out from the nozzle of the atomizer, and the water flow rate is 6m 3 / min, the atomizer nozzle is a double-layer annular nozzle with multi-focus jet, and two main nozzles 4 and two sub-nozzles 6 are set. The injection angle θ of the two focal points 8 is 16°, and the high pressure water pressure is 45Mpa.

[0043] The sphericity of the produced powder is 92%, and th...

Embodiment 3

[0046] Example 3: Production of 316L injection molding stainless steel powder

[0047] 1) Prepare the required stainless steel raw materials according to the content of each element in the stainless steel powder grade (Table 2);

[0048] 2) Add the above-mentioned stainless steel raw materials into the medium-frequency induction heating furnace, and the superheat of the melt is 200°C;

[0049] 3) Pour the molten metal of the above stainless steel material into the crucible 1, and then flow it down from the tundish 2, the flow rate of the molten metal is 38g / s;

[0050] 4) The high-pressure water is sprayed from the nozzle of the atomizer. The nozzle of the atomizer is a double-layer annular nozzle with multi-focus jet, and four main nozzles 4 and four auxiliary nozzles 6 are set. The spray angle of the first focal point 7 is α 18°, high pressure water pressure 70Mpa, second focus 8 jet angle θ is 16°, high pressure water pressure 60Mpa, water flow 5m 3 / min.

[0051] The sp...

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Abstract

The method discloses a method for producing a spherical stainless steel powder material by using a high pressure water atomization method, which comprises the following steps: preparing required stainless steel raw materials according to the contents of components in the grade of the spherical stainless steel powder; adding the stainless steel raw materials into an intermediate frequency induction heating furnace, wherein the degree of superheat of melt is 150-200DEG C; pouring the molten metal of the stainless steel raw materials into a crucible, and enabling the molten metal to flow from the tundish, wherein the flow velocity of the molten metal is 38-45g / s; spraying the high-pressure water from an atomizer nozzle, wherein the jet angle of the atomizer nozzle is 10-20 degrees, the pressure of the high-pressure water is 35-90MPa, and the water flow quantity is 3.3-6m<3> / min. The nozzle of the atomizer is a double-layer annular ring nozzle. The spherical stainless steel powder produced by the method of the invention has even components, high sphericity, and low cost, and the method is simple to operate.

Description

technical field [0001] The invention relates to a method for producing spherical stainless steel powder by a high-pressure water atomization method, which is applied to the fields of precision casting, powder metallurgy and injection molding. Background technique [0002] Stainless steel powder and its metallurgical products are one of the main products of the powder metallurgy industry. Stainless steel powder is mainly used in industries such as powder metallurgy, pressing and sintering (PM), injection molding (MIM), sintering filter, chemical fiber spinning and filtering stainless steel sand, thermal spraying (supersonic spraying, etc.) and metal shot blasting. With the development of powder metallurgy technology and metal injection molding (Metal Injection Molding, MIM) technology, spherical stainless steel powder is widely used in powder metallurgy gears, sintered filters, oil bearings, office equipment, medical equipment and other machinery and electrical appliances ( ...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 付华张光磊付丽田秀淑秦国强李彦芳
Owner SHIJIAZHUANG TIEDAO UNIV
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