CN114505486A - Stainless steel powder for powder metallurgy high-density balance block and manufacturing method thereof - Google Patents
Stainless steel powder for powder metallurgy high-density balance block and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
- B22F2009/0828—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid with water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0844—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid in controlled atmosphere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0848—Melting process before atomisation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses stainless steel powder for a powder metallurgy high-density balance block and a manufacturing method thereof, wherein the stainless steel powder for the high-density balance block comprises the following chemical components in percentage by weight: 8-13% of Cr, 78-8% of Ni1, 1-12% of Cu, 1-10% of Mn, 0.5-2% of Si, less than 0.2% of C and the balance of Fe, and the preparation method comprises the following steps: 1) preparing materials according to the component requirements; 2) putting the ingredients into a smelting furnace for smelting; 3) pouring the stainless steel molten in the step 2) into a spray tray, allowing the molten stainless steel to flow out from a nozzle leak hole, atomizing by using high-pressure water, condensing water to obtain water atomized stainless steel powder, dehydrating, drying and grading the water atomized stainless steel powder, and adding an additive to mix to prepare the finished stainless steel powder. According to the invention, by adding multiple metal elements, the sintering activity of the stainless steel powder is improved, the sintering temperature is reduced, and meanwhile, the density of the sintered body of the balance block is improved, so that the use requirement of the balance block of the compressor is met.
Description
Technical Field
The invention relates to the field of stainless steel powder, in particular to stainless steel powder for a powder metallurgy high-density balance block and a manufacturing method thereof.
Background
Powder metallurgy is a process technology for preparing metal powder or various powder metallurgy products by using metal powder (or a mixture of metal powder and nonmetal powder) as a raw material and performing forming, sintering and post-treatment.
The powder metallurgy technology combines the material science and the metal forming technology together, and becomes a novel processing technology which has a large range of high efficiency, material saving, energy saving and no cutting. The powder metallurgy method for producing metal products overcomes the defects of high production cost, low utilization rate of metal materials, low product size precision and the like of the traditional casting technology, obviously improves the extremely harsh requirements of the traditional casting technology on the product shape, and simultaneously has good mechanical properties, so the powder metallurgy method is widely applied to various fields of agriculture and forestry machinery, textile machinery, office equipment, household appliances, hardware fittings, automobile and motorcycle fittings and the like. The powder metallurgy stainless steel product has oxidation resistance, corrosion resistance, high mechanical property and abrasion resistance, and can be used for producing high-precision complex parts in batches, so that the powder metallurgy stainless steel product has wide application prospect.
However, the prior common powder metallurgy plant only has a mesh belt sintering furnace with the allowed maximum temperature of 1150 ℃, but the sintering temperature is low, the density of the produced powder metallurgy stainless steel product is low, and the mechanical property and the corrosion resistance are not high, so that the stainless steel product with high requirement cannot be produced, and the capability of producing the stainless steel product by powder metallurgy is limited. When stainless steel products with better mechanical property and corrosion resistance are needed, a molybdenum wire furnace or a vacuum sintering furnace is adopted for high-temperature sintering at 1300 ℃. For example, the powder metallurgy of 304 stainless steel is generally carried out by sintering in a high-temperature molybdenum wire furnace, wherein the sintering temperature is 1300 ℃, and the required performance of most products can be achieved. Most domestic powder metallurgy product factories do not have expensive high-temperature molybdenum wire furnaces or vacuum sintering furnace production lines, and the production line has high energy consumption and low efficiency, so that the production bottleneck is obvious. The main problem of how to obtain stainless steel products with high density and high performance by low-temperature sintering in a mesh belt furnace at low production cost is at present.
Disclosure of Invention
The present invention is to overcome the above-mentioned disadvantages of the prior art, and to provide a stainless steel powder for a high-density weight having good compressibility and being sintered at a low temperature, and a method for manufacturing the same.
The invention is realized by the following modes:
the stainless steel powder for the powder metallurgy high-density balance block is characterized in that: the composite material comprises the following components in percentage by weight: 8-13% of Cr, 78-8% of Ni1, 1-12% of Cu, 1-10% of Mn, 0.5-2% of Si, less than 0.2% of C and the balance of Fe.
Preferably, the stainless steel powder for the powder metallurgy high-density balance block is characterized in that: the composite material comprises the following components in percentage by weight: 9-12% of Cr, 78-5% of Ni3, 9-12% of Cu, 3-5% of Mn 1-1.5% of Si, less than 0.2% of C and the balance of Fe.
The manufacturing steps of the stainless steel powder of the powder metallurgy high-density balance block are as follows:
1) batching according to the stainless steel powder component of the powder metallurgy high-density balance block;
2) putting the ingredients into a smelting furnace for smelting;
3) pouring the stainless steel molten in the step 2) into a drain ladle, flowing out through a nozzle leak hole on a spray disc, atomizing by using high-pressure water, filling nitrogen in an atomizing tank as a protective atmosphere to prevent oxidation, and condensing water to form irregular powder.
4) And (3) dehydrating, drying, screening and grading the stainless steel powder obtained in the step 3), and adding a mixed additive to prepare the finished stainless steel powder.
Wherein the mixed additive accounts for 1-1.5% of the mass of the water atomized stainless steel powder.
Wherein the blending additive comprises two or more of the following additives: lubricant, green reinforcing agent and flow rate agent.
In the step 3), the pressure of the high-pressure water is 15-20 Mpa.
In the step 3), water is atomizedThe loose packed density of the finished stainless steel powder is 3.0-3.3 g/cm3。
The invention has the beneficial effects that: the stainless steel powder is alloy powder, and by adding a plurality of metal elements, the sintering activity of the stainless steel powder and the density of a balance block sintered body are improved, the sintering temperature is reduced, and the non-magnetism of the stainless steel is ensured, specifically: manganese in the balance block can make the balance block nonmagnetic, and the preferred range of manganese is 3-5%; the rust resistance can be effectively improved when the contents of chromium and nickel reach a certain proportion; the addition of copper, silicon and other elements can not only improve the sintering density of the powder metallurgy product, but also improve the strength and the antirust performance of the stainless steel product. The silicon of the invention can improve the compactness, the rust-proof performance and the oxidation resistance of the product, the preferable range is 1-1.5%, when the proportion is less than 1% or more than 1.5%, the advantages in all aspects are not obvious, and when the proportion exceeds 2%, other comprehensive performances are influenced. The higher the copper content is in a certain range, the better the powder compressibility is, the higher the density of the balance block after sintering is, and the shrinkage rate is far greater than that of 304 stainless steel under the same sintering condition as that of 304 stainless steel, so that a high-density stainless steel product is prepared; molten steel is added and stirred when the smelting of copper is close to the end sound, so that the burning loss of copper can be prevented; the preferred range of copper in the stainless steel powder is 9-12%. The components of the alloy ensure the austenite structure and meet the use requirement of the balance block of the compressor. The stainless steel powder can be pressed and formed under the pressure of 600-800 MPa; sintering the pressed blank into a stainless steel balance block product in an ammonia decomposition atmosphere or a vacuum furnace with the dew point of-45 to-50 ℃, wherein the sintering temperature is 1100 to 1350 ℃. The method is suitable for the conditions of the conventional common powder metallurgy plant, namely, the product density can be greatly improved in the conventional mesh belt sintering furnace, and the mesh belt sintering furnace has the advantages of no magnetism, high strength, good antirust property and high production efficiency, thereby meeting the requirements of market performance and mass production.
The stainless steel powder is pressed into a balance block blank, the balance block blank is sintered in a mesh belt sintering furnace, under the same condition, compared with the common 304 stainless steel, the sintering shrinkage rate is more than 10 times, the density of the product can be greatly improved, the price is low, and the balance block blank can be used for replacing 304 on some occasions. Under the same condition, the stainless steel high-density balance block powder is pressed, the tonnage of a forming machine is far lower than that of the high manganese steel, the cost of equipment investment is greatly reduced, and the cost of development and maintenance of the die is far lower than the related cost of the high manganese steel balance block. Under the same condition, the pressed high-density balance block blank can meet the performance requirement only by sintering 1050-. Can completely replace the market for producing the balance weight by high manganese steel powder.
Detailed Description
The technical solution of the present invention will be further specifically described below by way of specific examples. It is to be understood that the examples are for purposes of illustration and are not to be construed as a limitation of the invention, and that any variations and/or modifications may be made to the invention as it falls within the scope of the invention.
Example 1
Blending the alloy components of combination 1-combination 4 in the table 1, putting the materials in the groups into a smelting furnace for smelting, and deoxidizing and deslagging after molten steel is molten; atomizing by adopting a water-gas double-nozzle, wherein nitrogen protection is provided in the atomizing process, atomizing under the water pressure of 15Mpa, dehydrating and drying the powder, and sieving by a 100-mesh sieve to obtain stainless steel powder; adding 0.03% of spindle oil, and then adding mixed additives, wherein the additives comprise a lubricant, a green reinforcing agent and a flow rate agent, and the additive accounts for 1.2% of the total weight, and combining to obtain four groups of finished stainless steel powder.
TABLE 1
Example 2
Four sets of finished stainless steel powders of example 1 were compared to 304 stainless steel powder atomized with water.
Because the specific components will change slightly during smelting, the chemical components of the stainless steel powder of group 4 and the stainless steel powder of the comparative group 5 are shown in table 2:
TABLE 2
As can be seen from table 2, the Mn element content in the stainless steel powders of combinations 1 to 4 is significantly higher than that of comparative example 5, and the influence of the comparative Mn content on the compressibility, green strength, sintering magnetism, and salt spray properties of the powders is mainly verified, and finally, an appropriate content is selected.
Sintering stainless steel powder pressed compacts of the combination 1-4 and the comparison group 5 in a nitrogen-hydrogen mixed atmosphere with the dew point of-45 to-50 ℃; the sintering temperature of the mesh belt sintering furnace is 1130 ℃. In order to facilitate the visual contrast performance, GB/T1481-1998 is adopted to detect the compressibility; detecting the green strength by GB/T6804-2002; the magnetic property of the magnetic material is detected by GB/T2408-; the antirust performance of the antirust paint is tested by adopting the GB/T2423.17-93 neutral salt spray test standard (NSS).
The test results are shown in table 3:
TABLE 3
It can be seen from Table 3 that the higher the manganese content, the poorer the compressibility, green strength and salt spray properties; the manganese content is 3-5%, so that the effect of no magnetism can be achieved, and other properties are ideal.
Example 3
Preparing materials according to alloy components of combination 6-combination 9 in table 4, respectively, putting various materials in each group into a smelting furnace for smelting, and performing deoxidation and slag removal after molten steel is molten; atomizing by adopting a water-gas double-nozzle, wherein nitrogen protection is provided in the atomizing process, atomizing under the water pressure of 15Mpa, dehydrating and drying the powder, and sieving by a 100-mesh sieve to obtain stainless steel powder; adding 0.03% of spindle oil, and then adding mixed additives, wherein the additives comprise a lubricant, a green reinforcing agent and a flow rate agent, and the additive accounts for 1.2% of the total weight, and combining to obtain four groups of finished stainless steel powder.
TABLE 4
Example 4
Four sets of finished stainless steel powders of example 3 were compared to 304 stainless steel powder atomized with water.
The specific components will change slightly during smelting, and the chemical composition of the stainless steel powder of 4 components and the comparative group 5 is shown in table 5:
TABLE 5
As can be seen from Table 5, the Si content in the stainless steel powders of examples 6 to 9 was significantly higher than that of comparative example 5, and the effects of the comparative Si content on the sintering dimensional change rate, the sintering strength, the sintering magnetism, and the salt spray property of the sintered balance mass were mainly verified, and the appropriate content was finally selected.
The stainless steel powder pressed compact of the combination 6-9 and the comparison group 5 is sintered in a nitrogen-hydrogen mixed atmosphere with the dew point of-45 to-50 ℃; the sintering temperature of the mesh belt sintering furnace is 1130 ℃, so that the performance is visually compared, and the change rate of the sintering size is detected by GB/T5157-; GB/T6804-2002 is adopted to detect the sintering strength; the magnetic property of the magnetic material is detected by GB/T2408-; the antirust performance of the antirust paint is tested by adopting the GB/T2423.17-93 neutral salt spray test standard (NSS).
The stainless steel powders of combination 6-9, control 5 had sintered size change rate, sintered strength, sintered magnetic properties, salt spray test properties as shown in table 6:
TABLE 6
As can be seen from Table 6, under the same conditions, the combination of the invention 6-9 has the sintering strength and the sintering size change rate which are all higher than those of the common 304 stainless steel of the comparison group 5; combinations 6-8 are completely nonmagnetic; the silicon content is 0.5-2%, so that the shrinkage rate of the product can be effectively improved, the compactness is improved, and the strength is synchronously and effectively improved; the salt spray test performance is obviously improved along with the improvement of the silicon content; the silicon content of 1.5-2% is almost unchanged in property and gradually generates magnetism, so that the most preferable range thereof is 1-1.5%
By combining the above experiments, the optimal range of the copper content is continuously verified by selecting 4% of manganese content and 1.5% of silicon content to be matched.
Example 5
Blending the alloy components of combination 10-combination 13 in Table 7, respectively, smelting the materials in the groups in a smelting furnace, and deoxidizing and deslagging after molten steel is molten; atomizing by adopting a water-gas double-nozzle, wherein nitrogen protection is provided in the atomizing process, atomizing under the water pressure of 15Mpa, dehydrating and drying the powder, and sieving by a 100-mesh sieve to obtain stainless steel powder; adding 0.03% of spindle oil, and then adding mixed additives, wherein the additives comprise a lubricant, a green reinforcing agent and a flow rate agent, and the additive accounts for 1.2% of the total weight, and combining to obtain four groups of finished stainless steel powder.
TABLE 7
Example 6
Five sets of finished stainless steel powder from example 5 were compared to 304 stainless steel powder atomized with water.
The specific components will change slightly during smelting, and the chemical composition of the stainless steel powder of 5 composition and the comparative 5 is shown in table 8:
TABLE 8
As can be seen from Table 8, the contents of Cu, Si and Mn in the stainless steel powders of the compositions 10 to 14 are significantly higher than those of the comparative example 5, and the effects of the comparative Cu content on the green strength, compressibility, sintering dimensional change rate, finished product density, sintering strength, sintering magnetism and salt spray performance of the sintered balance block are mainly verified, and finally, the proper mixture ratio is selected.
The stainless steel powder pressed compact of the combination 10-14 and the comparison combination 5 is sintered in a nitrogen-hydrogen mixed atmosphere with the dew point of-45 to-50 ℃; the sintering temperature of the mesh belt sintering furnace is 1130 ℃, and the detection result is shown in table 6; in order to facilitate visual contrast performance, GB/T6804-2002 is adopted to detect the green strength and the sintering strength; the change of the sintering size is measured by GB/T5157-2015; the magnetic property of the magnetic material is detected by GB/T2408-; testing the antirust performance of the alloy by using GB/T2423.17-93 neutral salt spray test standard (NSS); detecting the density of the finished product by GB 3850-1983; GB/T1481-1998 was used to test compressibility.
The stainless steel powders of combinations 10-14, control 5, had sintered dimensional change rate, sintered strength, sintered magnetic properties, and salt spray test properties as shown in table 9:
TABLE 9
From table 9 it follows: the higher the copper content, the better the green strength and compressibility; when the copper content reaches 9%, the compressibility is obviously superior to that of stainless steel 304; when the copper content reaches 11%, the green strength is obviously higher than that of the stainless steel 304; the above examples are all superior to comparative stainless steel 304 in nonmagnetic properties; the higher the copper content is, the higher the shrinkage rate is, the higher the sintering strength is and the higher the finished product density is, and all the examples exceed the finished product density of the stainless steel 304; the higher the copper content is, the better the salt spray test performance is, and the copper content is up to 11%, which is obviously superior to that of stainless steel 304.
The proportion of alloy elements can be reasonably adjusted and arranged according to actual market demands, the high-density stainless steel balance block can be manufactured by using an extremely low finished product, and the performance of the high-density stainless steel balance block is superior to that of a stainless steel 304 material.
The above examples are only for illustrating the principles and effects of the present invention and are not intended to limit the present invention. Those skilled in the art can modify or modify the methods described herein without departing from the spirit and scope of the present disclosure, and it is intended that all such modifications and variations be included within the scope of the present disclosure as set forth in the following claims.
Claims (7)
1. A stainless steel powder for a powder metallurgy high density counterbalance, characterized in that: the composite material comprises the following components in percentage by weight: 8-13% of Cr, 78-8% of Ni1, 1-12% of Cu, 1-10% of Mn, 0.5-2% of Si, less than 0.2% of C and the balance of Fe.
2. A stainless steel powder for a powder metallurgy high density counterbalance, characterized in that: the composite material comprises the following components in percentage by weight: 9-12% of Cr, 78-5% of Ni3, 9-12% of Cu, 3-5% of Mn 1-1.5% of Si, less than 0.2% of C and the balance of Fe.
3. A method of manufacturing a stainless steel powder for powder metallurgy high density balance of claims 1-2, wherein: the method comprises the following steps:
1) batching according to the stainless steel powder component of the powder metallurgy high-density balance block;
2) putting the ingredients into a smelting furnace for smelting;
3) pouring the stainless steel molten steel melted in the step 2) into a drain ladle, flowing out through a nozzle leak hole on a spray plate, atomizing by using high-pressure water, filling nitrogen in an atomizing tank as protective atmosphere to prevent oxidation, and forming irregular powdery stainless steel powder after water condensation.
4) And 3) dehydrating, drying, screening and grading the stainless steel powder obtained in the step 3), and adding a mixed additive to prepare the finished stainless steel powder.
4. The method of manufacturing a stainless steel powder for a powder metallurgy high density weight according to claim 3, wherein: the mixed additive accounts for 1.0-1.5% of the weight of the finished stainless steel powder.
5. A method of manufacturing a stainless steel powder for a powder metallurgy high density weight according to claims 3-4 wherein: the blending additive comprises two or more of a lubricant, a green reinforcing agent, and a flow rate agent.
6. A method of manufacturing a stainless steel powder for a powder metallurgy high density weight according to claims 3-4 wherein: in the step 3), the pressure of the high-pressure water is 15-20 Mpa.
7. A method of manufacturing a stainless steel powder for a powder metallurgy high density weight according to claims 3-4 wherein: in the step 3), the loose packing density of the finished stainless steel powder is 3.0-3.3 g/cm3。
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