CN112981231A - High-manganese-nitrogen austenitic stainless steel powder and preparation method thereof - Google Patents
High-manganese-nitrogen austenitic stainless steel powder and preparation method thereof Download PDFInfo
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Abstract
The invention discloses high-manganese nitrogen austenitic stainless steel powder, and relates to the technical field of alloy material powder preparation. In the high manganese nitrogen austenitic stainless steel powder, the oxygen content is less than or equal to 0.1 wt.%, the nitrogen content is less than or equal to 0.5 wt.%, and the carbon content is less than or equal to 0.15 wt.%. The invention controls low oxygen content to help reduce the oxide on the surface of the powder, the oxide on the surface of the powder can block the atomic diffusion in the sintering process, inhibit the formation and growth of a sintering neck and reduce the sintering density; the proper nitrogen content is controlled, the stability of powder austenite is improved, the strength of the powder after sintering can be improved by the solid solution strengthening effect of nitrogen, the solubility of nitrogen in the austenite is low, and the production cost can be greatly increased by controlling the excessive nitrogen content; by controlling the proper carbon content, the oxygen in the powder can be removed in the sintering stage, the sintering efficiency and the sintering density are improved, but the carbon with too high content can react with the chromium to form complex carbide-free chromium element segregation, and the intergranular corrosion resistance of the stainless steel is reduced.
Description
Technical Field
The invention relates to the technical field of alloy material powder preparation, in particular to high-manganese nitrogen austenitic stainless steel powder and a preparation method thereof.
Technical Field
The austenitic stainless steel has the characteristics of good corrosion resistance, mechanical property, cold processing formability and no magnetism, and has wide application in the fields of chemical equipment, building decoration materials, civil kitchenware and the like. In the field of powder metallurgy industry, more austenitic stainless steels are used with the grades of 316L and 304, but in practical application, the strength is lower, and the defects that the specific gravity of Ni is higher and the cost of raw materials is higher are more obvious, so that the development of single-phase austenitic stainless steel with good corrosion resistance and higher strength by using nitrogen and manganese to replace nickel becomes a research hotspot at present. The nitrogen element is a strong austenite stabilizing element and plays a role in solid solution strengthening at the same time, the strength of the stainless steel is improved, and the manganese element can increase the stability of austenite when the stainless steel is cooled, inhibit the decomposition of the austenite and enable the austenite formed at high temperature to be kept at normal temperature.
The atomization powder preparation technology is one of the most common methods for preparing traditional stainless steel powder for powder metallurgy and injection molding, which has excellent performance and uniform components and granularity, and the atomization powder preparation is divided into a vacuum preparation method and a non-vacuum preparation method. The metal powder prepared by the vacuum atomization technology has the advantages of low oxygen content and good sphericity, but has high requirements on equipment and complex preparation process,low production efficiency, low fine powder yield and the like. For example, in the case of the stainless steel powder for preparing the durable coating by the vacuum atomization method in Chinese patent CN 111020402A, the vacuum pumping is required to be 10 DEG-1Pa below and argon of 99.999 purity was introduced and maintained until the end of atomization. Chinese patent CN108555285A adopts atomization technology to prepare high-nitrogen nickel-free stainless steel powder, and the yield of powder with 400 meshes is less than 40%. In addition, the existing atomization technology generally uses pure metal raw materials to carry out smelting according to design components, the pure metal raw materials are high in price, the difficulty that active elements such as alloy raw materials Cr, Si and Mn are easy to burn and lose exists in the non-vacuum smelting atomization process, the alloy elements are oxidized by air in the molten steel smelting process, the fluctuation of molten steel components is large, the quality of the molten steel is reduced, and meanwhile, the raw material metal or reducing agent is added to adjust the components, so that the preparation cost is increased.
Disclosure of Invention
Aiming at the problems of high preparation cost, large component fluctuation, low fine powder yield and the like of austenitic stainless steel powder in the prior art, the invention provides the high manganese nitrogen austenitic stainless steel powder and the preparation method thereof, aiming at solving the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
high manganese nitrogen austenitic stainless steel powder, wherein, calculated by weight percentage, the oxygen content is less than or equal to 0.1 wt.%, the nitrogen content is less than or equal to 0.5 wt.%, and the carbon content is less than or equal to 0.15 wt.%.
Preferably, the high manganese nitrogen austenitic stainless steel powder has an oxygen content of 0.07 wt.% or less, a nitrogen content: 0.15-0.35 wt.%, carbon content: 0.08-0.12 wt.%.
In the preferred scheme, the control of low oxygen content is helpful to reduce the oxide on the surface of the powder, the oxide on the surface of the powder can block the atomic diffusion in the sintering process, inhibit the formation and growth of sintering necks and reduce the sintering density; the proper nitrogen content is controlled, the stability of powder austenite is improved, the strength of the powder after sintering can be improved by the solid solution strengthening effect of nitrogen, the solubility of nitrogen in the austenite is low, and the production cost can be greatly increased by controlling the excessive nitrogen content; by controlling the proper carbon content, the oxygen in the powder can be removed in the sintering stage, the sintering efficiency and the sintering density are improved, but the carbon with too high content can react with the chromium to form complex carbide-free chromium element segregation, and the intergranular corrosion resistance of the stainless steel is reduced.
The high manganese nitrogen austenitic stainless steel powder is prepared from the following components in percentage by weight: 8.00% -10.00%, S: less than or equal to 0.003 percent, P: less than or equal to 0.05%, Si: 0.30% -0.80%, Cr: 13.00% -15.00%, Ni: 1.00% -2.00%, B: 0.002% -0.004%, Cu: 0.20 to 1.0 percent, and the balance of Fe and inevitable impurities.
The high manganese nitrogen austenitic stainless steel powder has the average grain diameter of less than or equal to 12 mu m and the tap density of more than or equal to 4.6g/cm3The apparent density is more than or equal to 4.2g/cm3And the yield strength after injection molding and sintering is more than or equal to 300MPa, the tensile strength is more than or equal to 650MPa, the elongation is more than or equal to 40 percent, and the hardness is more than or equal to 85 HRB.
The invention also aims to provide a preparation method of the high manganese nitrogen austenitic stainless steel powder, which comprises the following steps:
s1, performing AOD-LF refining-continuous casting by using blast furnace molten iron, high-carbon ferrochrome, silicomanganese alloy and electrolytic manganese as raw materials to obtain a billet;
s2, selectively carrying out hot rolling or annealing and acid washing on the steel billet to obtain a hot rolled plate or a desizing and washing plate;
s3, putting any one of the billet, the hot rolled plate and the back washing plate into an electric arc furnace to be heated and melted, and then adding a manganese source, a chromium source, a nickel source and a copper source to carry out component fine adjustment to obtain stainless steel liquid;
and S4, adding ferrosilicon alloy and a slag melting agent after the molten steel is molten down for deoxidation and slag melting, adjusting the fluidity of the molten steel, and atomizing the molten steel in an atomizing tank at a proper temperature to prepare powder.
Preferably, the blast furnace molten iron has a chromium content of 4.0-5.0 wt.%, a nickel content of 1.4-1.6 wt.%, a manganese content of 1.0-1.5 wt.%, and a silicon content of 0.8-1.2 wt.%; in the high-carbon ferrochrome, the carbon content is less than or equal to 7.0 wt.%, and the chromium content is 50.0-51.0 wt.%; the manganese content in the silicon-manganese alloy is 61.0-63.0 wt.%, and the silicon content is 25.0-26.0 wt.%; the manganese content in the electrolytic manganese is more than or equal to 99.9 wt.%.
In the preferred scheme, the low-cost high-quality blast furnace molten iron and the alloy raw materials are refined through AOD-LF, the preparation process is suitable for large-scale industrial production, alloying is realized, the components of the molten steel are accurately controlled, the burning loss of active metals in the subsequent process can be reduced, and the purposes of accurately controlling the components and improving the quality of the molten steel are achieved.
According to the preparation method of the high manganese nitrogen austenitic stainless steel powder, the electric arc furnace and the atomization tank are sequentially communicated and provided with the guide groove and the tundish, molten steel flows into the preheated tundish through the guide groove capable of being quickly replaced, then flows into the atomization tank from the tundish for atomization, and the flow rate of the molten steel is 8-10 kg/min.
Further, the temperature of the electric arc furnace is 1700-1750 ℃, the temperature of the diversion trench is 700-800 ℃, and the temperature of the tundish is 1580-1650 ℃.
Furthermore, the tundish is preheated by the heating coil, the tundish is preheated from 5KW low power, the preheating is gradually improved to 20KW until the tundish is baked thoroughly, the baking power of the tundish before casting is constant between 5KW and 15KW, the heating speed of the tundish can be prevented from being too high, the tundish is prevented from being broken and leaking steel due to too high temperature, the liquid level of the molten steel in the tundish is kept constant at 2/3 with the height of the tundish, the liquid level is prevented from being fluctuated to cause the temperature of the molten steel to be rapidly reduced, and the molten steel is difficult to break to cause coarsening of powder granularity.
Preferably, the atomization of the molten steel is carried out using a close-coupled annular spray disk and conical nozzle, but is not limited to such spray disks and nozzles.
Preferably, the atomization medium is high-purity nitrogen, the pressure of the atomization medium is 4.0-8.0MPa, and the temperature of the atomization medium is 25-400 ℃. More preferably, the purity of the atomizing medium is > 99.99%, the atomizing medium pressure is 5.0-7.0MPa, and the atomizing medium temperature is 400 ℃.
According to the invention, the higher the temperature of the atomizing medium is, the faster the gas flow velocity is, the larger the kinetic energy provided by the atomizing medium is, and in the process of crushing the molten steel, the kinetic energy of the atomizing medium is converted into the surface energy of the molten steel, so that the crushing efficiency of the molten steel is improved, the stainless steel powder with finer granularity is obtained after the molten steel is crushed and solidified, and the yield of fine powder is improved.
Compared with the prior art, the invention has the following advantages:
(1) the high manganese nitrogen austenitic stainless steel powder disclosed by the invention is reasonable in component design, the density of a sintered part is high, the corrosion performance is not greatly reduced compared with Cr-Ni stainless steel, and the mechanical performance and hardness are obviously improved.
(2) According to the high manganese nitrogen austenitic stainless steel powder disclosed by the invention, blast furnace molten iron is used as a main raw material and is subjected to AOD-LF refining, so that the burning loss of active metals in the subsequent open smelting process is obviously reduced, the accurate component control and the production cost reduction are realized, and the large-scale industrial production is more suitable for being carried out.
(3) According to the high manganese nitrogen austenitic stainless steel powder, the atomization process parameters are reasonably controlled, and compared with the traditional open gas atomization powder, the powder is fine in granularity, high in fine powder yield and concentrated in powder grain size distribution.
Drawings
FIG. 1 is a scanning electron microscope picture of a powder of a high manganese nitrogen austenitic stainless steel in example 1;
FIG. 2 is a scanning electron microscope picture of the powder of the high manganese nitrogen austenitic stainless steel in example 2.
Detailed Description
The high manganese nitrogen austenitic stainless steel powder and the method for producing the same according to the present invention will be described in detail below with reference to specific examples, but are not limited thereto.
Example 1
The chromium content in the blast furnace molten iron was 4.0 wt.%, the nickel content was 1.50 wt.%, the manganese content was 1.0 wt.%, and the silicon content was 0.8 wt.% (the components contained in each substance were individually calculated in terms of weight percent, the same applies hereinafter); in the high carbon ferrochrome, the carbon content is 6.9 wt.%, and the chromium content is 50.1 wt.%; the manganese content in the electrolytic manganese was 99.92 wt.%.
The blast furnace molten iron, high carbon ferrochrome and electrolytic manganese raw materials are proportioned according to the designed components, wherein 42800Kg of blast furnace molten iron, 13760Kg of high carbon ferrochrome, 6500Kg of silicomanganese alloy and 2000Kg of electrolytic manganese are subjected to AOD top-bottom combined oxygen blowing argon furnace, LF refining and continuous casting to obtain high-quality stainless steel raw materials, the stainless steel raw materials are cut into blocks and then melted in an electric arc furnace, the molten steel is melted down and subjected to direct reading spectral inspection for components, 2Kg of ferrosilicon alloy and 3Kg of slag melting agent are added (for deoxidation and slag melting are carried out, the fluidity of the molten steel is adjusted, and the finally obtained components are calculated according to the weight percentageMn：9.10％，S:0.007％，P:0.001％，Si：0.31％， Cr: 13.20%, Ni: 1.01%, B: 0.002%, Cu: 0.80% and the balance FeThe stainless steel liquid.
The temperature of the molten steel before casting is adjusted to 1700 ℃, the molten steel flows into a tundish through a preheated diversion trench, the diversion trench is preheated to 800 ℃ through flame, the heating power of the tundish is kept at 14KW, the temperature of the molten steel in the tundish is 1600 ℃, the flow rate of the molten steel flowing into an atomization tank from the tundish is 10kg/min, the temperature of an atomization medium nitrogen is 400 ℃, the atomization pressure is 4.0MPa, the molten steel is crushed and rapidly cooled through high-temperature high-pressure nitrogen, and is classified through a circulating airflow classification system, and the proportion of stainless steel powder prepared in a single furnace is 36%. The final stainless steel powder had an oxygen content of 0.065 wt.%, a carbon content of 0.092 wt.%, a nitrogen content of 0.32 wt.%, and a tapped density of 4.77g/cm3Loose packed density of 4.34g/cm3. The powder prepared in this example, after injection molding and sintering, had a tensile strength of 661MPa, a yield strength of 271MPa, an elongation of 46%, and a hardness of 82 HRB.
Example 2
The chromium content in the blast furnace molten iron is 4.5 wt.%, the nickel content is 1.45 wt.%, the manganese content is 1.25 wt.%, and the silicon content is 1.0 wt.%; in the high carbon ferrochrome, the carbon content is 7.1 wt.%, and the chromium content is 50.8 wt.%; the manganese content in the silicon-manganese alloy is 61.9 wt.%, and the silicon content is 24.9%; the manganese content in the electrolytic manganese was 99.95 wt.%.
The blast furnace molten iron, the high-carbon ferrochrome and the electrolytic manganese raw materials are proportioned according to the designed components, wherein 49500Kg of blast furnace molten iron, 13100Kg of high-carbon ferrochrome, 6100Kg of silicomanganese alloy and 2000Kg of electrolytic manganese are subjected to AOD top-bottom combined oxygen-blowing argon furnace, LF refining and continuous casting to obtain high-quality stainless steel raw materials, the stainless steel raw materials are cut into blocks and then melted in an electric arc furnace, the molten steel is subjected to direct reading spectral inspection after being melted down, 1.5Kg of ferrosilicon and 3.5Kg of slag melting agent are added for deoxidation and slag melting, the fluidity molten steel is adjusted, and the final obtained component is calculated according to the weight percentageMn：9.80％，S:0.004％，P:0.006％，Si：0.68％， Cr: 14.20%, Ni: 1.25%, B: 0.003%, Cu: 0.21% and the balance FeThe stainless steel liquid.
The temperature of the molten steel before casting is adjusted to 1750 ℃, the molten steel flows into a tundish through a preheated diversion trench, the diversion trench is preheated to 780 ℃ through flame, the heating power of the tundish is kept at 15KW, the temperature of the molten steel in the tundish is 1650 ℃, the flow rate of the molten steel flowing into an atomization tank from the tundish is 8kg/min, the temperature of an atomization medium nitrogen is 350 ℃, the atomization pressure is 6.2MPa, the molten steel is crushed by high-temperature high-pressure nitrogen and rapidly cooled, and is classified by a circulating air flow classification system, and the proportion of stainless steel powder prepared by a single furnace is 38%. The final stainless steel powder had an oxygen content of 0.074 wt.%, a carbon content of 0.145 wt.%, a nitrogen content of 0.38 wt.%, and a tapped density of 4.71g/cm3The apparent density is 4.31g/cm3. The powder prepared in this example after injection molding and sintering had tensile strength of 752MPa, yield strength of 298MPa, elongation of 41%, and hardness of 89 HRB.
Example 3
The chromium content in the blast furnace molten iron is 5.0 wt.%, the nickel content is 1.52 wt.%, the manganese content is 1.5 wt.%, and the silicon content is 1.2 wt.%; in the high carbon ferrochrome, the carbon content is 7.0 wt.%, and the chromium content is 50.9 wt.%; the manganese content in the silicon-manganese alloy is 62.1 wt.%, and the silicon content is 26.5%; the manganese content in the electrolytic manganese is 99.96 wt.%.
The blast furnace molten iron, the high carbon ferrochrome and the electrolytic manganese raw materials are mixed according to the designed components, wherein the high carbon ferrochrome and the electrolytic manganese raw materials are50000Kg of furnace molten iron, 14180Kg of high-carbon ferrochrome, 5300Kg of silicon-manganese alloy and 2000Kg of electrolytic manganese are obtained, the high-quality stainless steel raw material is obtained by an AOD top-bottom combined oxygen blowing argon furnace, LF refining and continuous casting, the stainless steel raw material is cut into blocks and then melted in an electric arc furnace, the molten steel is subjected to direct reading spectral inspection after being melted down, 2.5Kg of ferrosilicon alloy and 4Kg of slag melting agent are added for deoxidation and slag melting, the fluidity of the molten steel is adjusted, and the final obtained component is calculated according to the weight percentageMn：9.10％，S:0.005％，P:0.013％，Si：0.80％，Cr： 14.99%, Ni: 1.96%, B: 0.004%, Cu: 1.00 percent, and the balance being FeThe stainless steel liquid.
The temperature of the molten steel before casting is adjusted to be 1710 ℃, the molten steel flows into a tundish through a preheated diversion trench, the diversion trench is preheated to 700 ℃ through flame, the heating power of the tundish is kept at 12KW, the temperature of the molten steel in the tundish is 1580 ℃, the flow rate of the molten steel flowing into an atomization tank from the tundish is 8kg/min, the temperature of an atomization medium nitrogen is 400 ℃, the atomization pressure is 8.0MPa, the molten steel is crushed and rapidly cooled through high-temperature high-pressure nitrogen, classification is carried out through a circulating air flow classification system, and the proportion of stainless steel powder prepared by a single furnace is 42%. The final stainless steel powder had an oxygen content of 0.071 wt.%, a carbon content of 0.011 wt.%, a nitrogen content of 0.39 wt.%, and a tapped density of 4.76g/cm3Loose packed density of 4.34g/cm3。
Comparative example 1
The method comprises the following steps of proportioning raw materials of pure iron, electrolytic manganese, a pure nickel plate, micro-carbon ferrochrome and ferrosilicon according to design components, wherein the iron content in the pure iron is 99.8 wt.%, the manganese content in the electrolytic manganese is 99.91 wt.%, the nickel content in the pure nickel plate is 99.91 wt.%, the chromium content in the micro-carbon ferrochrome is 52.1 wt.%, the silicon content in the ferrosilicon is 76.0 wt.%, the pure iron consumption is 300Kg, the electrolytic manganese is 104Kg, the micro-carbon ferrochrome is 250Kg, the pure nickel is 12.5Kg, the ferrosilicon is 5.6Kg, melting is carried out in an electric arc furnace, the molten steel is subjected to direct-reading spectral inspection after being melted, 4.5Kg of ferrosilicon and 5.5Kg of slag melting agent are added for deoxidation and slag melting, and the final obtained components are calculated according to weight percentageMn：9.5％，S:0.02％，P:0.05％，Si：0.69％，Cr：14.0％，Ni：1.20％，B： 0.007%, Cu: 0.35%, the balanceIn an amount of FeThe stainless steel liquid. The temperature of the molten steel before casting is adjusted to 1650 ℃, the molten steel flows into a tundish through a preheated diversion trench, the diversion trench is preheated to 200 ℃ through flame, the heating power of the tundish is kept at 10KW, the temperature of the molten steel in the tundish is 1520 ℃, the flow rate of the molten steel flowing into an atomization tank from the tundish is 18kg/min, the temperature of an atomization medium nitrogen is 25 ℃, the atomization pressure is 4.8MPa, the molten steel is crushed and rapidly cooled through high-temperature high-pressure nitrogen, and is classified through a circulating air flow classification system, and the proportion of stainless steel powder prepared by a single furnace is 25%. The final-500 mesh stainless steel powder had an oxygen content of 0.11 wt.%, a carbon content of 0.165 wt.%, a nitrogen content of 0.28 wt.%, and a tapped density of 4.51g/cm3The apparent density is 4.35g/cm3。
Modifications and equivalents of the present invention as well as other embodiments of the invention, and further variations and modifications thereof, will occur to persons skilled in the art without departing from the spirit of the present invention as defined by the appended claims.
Claims (10)
1. A high manganese nitrogen austenitic stainless steel powder is characterized in that: in the high manganese nitrogen austenitic stainless steel powder, the oxygen content is less than or equal to 0.1 wt.%, the nitrogen content is less than or equal to 0.5 wt.%, and the carbon content is less than or equal to 0.15 wt.%.
2. The high manganese nitrogen austenitic stainless steel powder of claim 1, characterized in that: the oxygen content of the high manganese nitrogen austenitic stainless steel powder is less than or equal to 0.07 wt.%, and the nitrogen content: 0.15-0.35 wt.%, carbon content: 0.08-0.12 wt.%.
3. The high manganese nitrogen austenitic stainless steel powder of claim 1 or 2, characterized in that: the high manganese nitrogen austenitic stainless steel powder also comprises the following components in percentage by weight, Mn: 9.00% -10.00%, S: less than or equal to 0.003 percent, P: less than or equal to 0.05%, Si: 0.30% -0.80%, Cr: 13.00% -15.00%, Ni: 1.00% -2.00%, B: 0.002% -0.004%, Cu: 0.20 to 1.0 percent, and the balance of Fe and inevitable impurities.
4. The high manganese nitrogen austenitic stainless steel powder of claim 3, characterized in that: the average grain diameter of the high manganese nitrogen austenitic stainless steel powder is less than or equal to 12 mu m, and the tap density is more than or equal to 4.6g/cm3The apparent density is more than or equal to 4.2g/cm3And the yield strength after injection molding and sintering is more than or equal to 300MPa, the tensile strength is more than or equal to 650MPa, the elongation is more than or equal to 40 percent, and the hardness is more than or equal to 85 HRB.
5. A method for the production of the high manganese nitrogen austenitic stainless steel powder according to claim 4, characterized by comprising the steps of:
s1, performing AOD-LF refining-continuous casting by using blast furnace molten iron, high-carbon ferrochrome, silicomanganese alloy and electrolytic manganese as raw materials to obtain a billet;
s2, selectively carrying out hot rolling or annealing and acid washing on the steel billet to obtain a hot rolled plate or a desizing and washing plate;
s3, putting any one of the billet, the hot rolled plate and the back washing plate into an electric arc furnace to be heated and melted, and then adding a manganese source, a chromium source, a nickel source and a copper source to carry out component fine adjustment to obtain stainless steel liquid;
and S4, adding ferrosilicon alloy and a slag melting agent after the molten steel is molten down for deoxidation and slag melting, adjusting the fluidity of the molten steel, and atomizing the molten steel in an atomizing tank at a proper temperature to prepare powder.
6. The method of manufacturing a high manganese nitrogen austenitic stainless steel powder according to claim 5, characterized in that: according to weight percentage, the chromium content in the blast furnace molten iron is 4.0-5.0 wt.%, the nickel content is 1.3-1.6 wt.%, the manganese content is 1.0-1.5 wt.%, and the silicon content is 0.8-1.2 wt.%; in the high-carbon ferrochrome, the carbon content is less than or equal to 8.0 wt.%, and the chromium content is 48.0-52.0 wt.%; the manganese content in the silicon-manganese alloy is 60.0-65.0 wt.%, and the silicon content is 24.0-27.0%; the manganese content in the electrolytic manganese is more than or equal to 99.9 wt.%.
7. The method of manufacturing a high manganese nitrogen austenitic stainless steel powder according to claim 5, characterized in that: the electric arc furnace and the atomization tank are sequentially communicated with each other to be provided with a diversion trench and a tundish, the molten steel flows into the preheated tundish through the diversion trench capable of being quickly replaced and then flows into the atomization tank from the tundish to be atomized, and the flow speed of the molten steel is 8-10 kg/min.
8. The method of manufacturing a high manganese nitrogen austenitic stainless steel powder according to claim 5, characterized in that: the temperature of the electric arc furnace is 1700-1750 ℃, the temperature of the diversion trench is 700-800 ℃, and the temperature of the tundish is 1580-1650 ℃.
9. The method of producing a high manganese nitrogen austenitic stainless steel powder according to claim 8, characterized in that: the tundish is preheated by a heating coil, the preheating of the tundish is gradually improved to 20KW from 5KW low power to the thorough baking of the tundish, the baking power of the tundish before casting is constant between 12KW and 15KW, and the liquid level of the molten steel in the tundish is kept constant at 2/3 of the height of the tundish.
10. The method of manufacturing a high manganese nitrogen austenitic stainless steel powder according to claim 5, characterized in that: the atomization medium is high-purity nitrogen, the pressure of the atomization medium is 4.0-8.0MPa, and the temperature of the atomization medium is 350-400 ℃.
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