CN116083819A - High-strength austenitic stainless steel powder and preparation method thereof - Google Patents
High-strength austenitic stainless steel powder and preparation method thereof Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 42
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 34
- 238000005238 degreasing Methods 0.000 claims abstract description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 239000010935 stainless steel Substances 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 239000000853 adhesive Substances 0.000 claims abstract description 5
- 230000001070 adhesive effect Effects 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 3
- 239000007822 coupling agent Substances 0.000 claims abstract description 3
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- 238000000034 method Methods 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000001746 injection moulding Methods 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 14
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- 238000001125 extrusion Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 2
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- 238000004321 preservation Methods 0.000 claims description 2
- 230000035699 permeability Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 16
- 230000007797 corrosion Effects 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 abstract description 12
- 230000005389 magnetism Effects 0.000 abstract description 11
- 229910052804 chromium Inorganic materials 0.000 abstract description 3
- 230000014759 maintenance of location Effects 0.000 abstract description 2
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- 238000005121 nitriding Methods 0.000 description 5
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 4
- 235000021355 Stearic acid Nutrition 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000005469 granulation Methods 0.000 description 4
- 230000003179 granulation Effects 0.000 description 4
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- 229910017604 nitric acid Inorganic materials 0.000 description 4
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 4
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- 229910000619 316 stainless steel Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- RBVYPNHAAJQXIW-UHFFFAOYSA-N azanylidynemanganese Chemical compound [N].[Mn] RBVYPNHAAJQXIW-UHFFFAOYSA-N 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
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- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
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- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/108—Mixtures obtained by warm mixing
-
- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
- C22C33/0285—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with Cr, Co, or Ni having a minimum content higher than 5%
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to high-strength austenitic stainless steel powder and a preparation method thereof. The existing stainless steel powder cannot have better strength and hardness on the premise of good corrosion resistance and no magnetism in a retention period. The stainless steel powder of the invention has the carbon content less than or equal to 0.10wt.%, the oxygen content less than or equal to 0.20wt.%, the nitrogen content less than or equal to 0.20wt.%, and Cr:15% -17%, mn:6% -8%, mo:3% -5%, ni:5% -11%, si: less than or equal to 1.0 percent, P: less than or equal to 0.03 percent, less than or equal to 0.03 percent of S and the balance of Fe. The preparation method of the product comprises the steps of setting the temperature of an internal mixer to 170-190 ℃, stirring at 15-20 r/min, adding stainless steel powder, a polymer adhesive and a coupling agent, stirring for 0.5-2 h, then reducing the temperature to 160-180 ℃, adding a lubricating dispersant, continuously stirring for 0.5-2 h to obtain a mixed bulk feed, granulating, extruding at 10-20 r/min, granulating at 10-20 r/min, obtaining an injection feed, degreasing and sintering to obtain a finished product. The invention improves the strength and hardness of the material on the premise of ensuring the corrosion resistance and the non-magnetism.
Description
Technical Field
The invention belongs to the field of powder injection molding materials, and particularly relates to high-strength austenitic stainless steel powder and a preparation method thereof.
Background
Powder injection molding is a brand new part forming processing technology formed by introducing a plastic injection molding technology into the field of powder metallurgy. The powder (metal powder and ceramic powder) and the organic binder are mixed into uniform feed, and the uniform feed is granulated and then injection-molded to obtain a molded blank, and the molded blank is sintered and densified into a required finished product after degreasing treatment. The process is a net-size forming process, has the advantages of high material utilization rate, capability of being directly formed into complex shapes, high mass production efficiency, high dimensional accuracy and the like, is continuously developed rapidly since the 90 s, and is increasingly and successfully applied commercially by adopting an injection molding process.
Austenitic stainless steel is widely used in the fields of decoration, kitchen ware, electronic products and the like, typically 304 and 316L, because of its excellent corrosion resistance and mechanical properties, but austenitic stainless steel cannot greatly improve its strength and hardness by heat treatment, and in the traditional casting field, the strength and hardness can be improved by work hardening, but after a large amount of processing, the austenitic structure generates deformation induced martensite, and has magnetism, and cannot meet the requirement on magnetic properties, so that the austenitic stainless steel is limited in application in the field with higher requirement on mechanical properties. Therefore, on the premise of ensuring that austenite has good corrosion resistance and no magnetism in a steel retention period, the steel has better strength and hardness, and becomes a new research direction.
Patent publication number CN105839022B discloses a high-hardness non-magnetic non-nickel stainless steel and a manufacturing method thereof, wherein the stainless steel comprises the following chemical components in percentage by weight: c:0.15 to 0.20 percent, si:0.2 to 0.8 percent, mn:17.0 to 19.0 percent, cr:13.5 to 14.5 percent, N:0.25 to 0.30 percent, cu:0.5 to 0.8 percent, B:0.0015 to 0.0040 percent, the hardness is HV 425 to 497, the yield strength is 1100 to 1350MPa, and the magnetic phase content is 0 percent.
However, the nitrogen content of the component is 0.25 to 0.30%, and for injection molding of metal powder, the nitrogen content needs to be added by infiltration through a nitrogen atmosphere in the sintering process, but the material is very uneven during sintering due to densification, so that the nitrogen content and the performance of different parts are easily uneven.
Patent publication number CN112981231B discloses a high manganese nitrogen austenitic stainless steel powder, relates to alloy material powder preparation technical field, its 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 percent, si:0.30% -0.80%, cr:13.00% -15.00%, ni:1.00% -2.00%, B:0.002% -0.004%, cu:0.20% -1.0%, the yield strength 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%, the hardness is more than or equal to 85HRB after injection molding sintering, but for metal powder injection molding, the cooling speed is slower, nitrogen dissolved into a matrix can be separated out and form a compound with chromium when the temperature is reduced, so that the material matrix is poor in chromium, the corrosion resistance is greatly influenced, and solution treatment is further needed to re-dissolve the nitrogen with the matrix, so that the process flow is complex, and the cost is higher.
Disclosure of Invention
The invention aims at the problems and provides high-strength austenitic stainless steel powder and a preparation method thereof, and the strength and hardness of the material are improved on the premise of ensuring the corrosion resistance and the non-magnetism of the powder.
The invention adopts the following technical scheme: a high strength austenitic stainless steel powder characterized by comprising the following components: calculated according to the weight percentage, the carbon content is less than or equal to 0.10wt percent, the oxygen content is less than or equal to 0.20wt percent, the nitrogen content is less than or equal to 0.20wt percent, cr:15% -17%, mn:6% -8%, mo:3% -5%, ni:5% -11%, si: less than or equal to 1.0 percent, P: less than or equal to 0.03 percent, less than or equal to 0.03 percent of S and the balance of Fe.
Preferably, the powder has a tap density of 4.5g/cm3 to 5.0g/cm 3 Bulk density of 3.9g/cm 3 -4.4g/cm 3 。
Preferably, the stainless steel powder D10:3-5 μm, D50:11-14 μm, D90:25-28 μm.
The invention also discloses a preparation method of the powder injection molding product, which is characterized in that the temperature of an internal mixer is set to 170-190 ℃, the stirring rotation speed is 15-20 r/min, the stainless steel powder, the polymer binder and the coupling agent are added, the stirring is carried out for 0.5-2 h, then the temperature is reduced to 160-180 ℃, the lubricating dispersant is added, the stirring is continued for 0.5-2 h, the mixed bulk feed is obtained, the granulating extrusion rotation speed is 10-20 r/min, the granulating rotation speed is 10-20 r/min, the injection feed is obtained, and the finished product is prepared through degreasing sintering.
Preferably, the degreasing sintering process is as follows: the blank after degreasing is put into a sintering furnace, the temperature is raised to 400-600 ℃ for 1-6 h, the temperature is kept for 2-8 h at 400-600 ℃, the residual polymer adhesive is removed through heating decomposition, the adhesive is completely removed through thermal degreasing, the temperature is continuously raised to the sintering temperature, and the sintered compact finished product is obtained after sintering, heat preservation and cooling.
The metal powder sintered product prepared by the method is characterized by having tensile strength of more than or equal to 500Mpa, yield strength of more than or equal to 200Mpa, elongation of more than or equal to 40%, hardness of more than or equal to 150HV1 and magnetic conductivity of less than or equal to 1.01.
The invention adjusts the material composition based on the traditional high-strength austenitic stainless, so that the material does not need nitriding in the sintering process, has better strength and hardness performance on the premise of having good corrosion resistance and non-magnetic performance, and does not need a heat treatment process after sintering. By adding a certain amount of Ni element into the material, the material can be fully austenitized in a non-nitrogen environment, so that the purpose of non-magnetism is achieved, on one hand, the corrosion resistance is improved, on the other hand, the tendency of forming continuous network carbide can be weakened, and the grains are thinned, so that the material does not need nitriding during sintering, does not need heat treatment, and can achieve the purpose of non-magnetism and higher hardness.
Drawings
Fig. 1 is a microscopic metallographic image 200X and 500X of example 1.
Fig. 2 is a microscopic metallographic image 200X and 500X of example 2.
Fig. 3 is a microscopic metallographic image 200X and 500X of example 3.
Detailed Description
The invention will be further illustrated with reference to specific examples.
Comparative example 1
The composition of the metal powder is as follows:
feeding: adding the stainless steel metal powder and the binder into a banburying tank, heating the banburying tank to 185 ℃, and banburying at the rotating speed of 15r/min for 0.5h; the banburying tank is cooled to 165 ℃, stearic acid is added, stirring is continued for 1h, and then extrusion granulation is carried out.
Injection molding: conventional injection processes.
Thermal degreasing in a nitric acid atmosphere: degreasing temperature 110 ℃ and degreasing time: and 12h.
Sintering: and (3) a thermal degreasing process, namely heating to 600 ℃ for 4 hours, and preserving heat for 3 hours at 600 ℃. The sintering process comprises the following steps: and (3) sintering in an argon protection atmosphere at 1380 ℃ per 3 hours. The performance results are as follows:
embodiment case one:
the metal powder comprises the following components in percentage by weight:
feeding: adding the stainless steel metal powder and the binder into a banburying tank, heating the banburying tank to 185 ℃, and banburying at the rotating speed of 15r/min for 0.5h; the banburying tank is cooled to 165 ℃, stearic acid is added, stirring is continued for 1h, and then extrusion granulation is carried out.
Injection molding: conventional injection processes.
Thermal degreasing in a nitric acid atmosphere: degreasing temperature 110 ℃ and degreasing time: and 12h.
Sintering: and (3) a thermal degreasing process, namely heating to 600 ℃ for 4 hours, and preserving heat for 3 hours at 600 ℃. The sintering process comprises the following steps: 1290 ℃ per 3h of argon protection atmosphere sintering. The performance results are as follows:
implementation case two:
the composition of the metal powder is as follows:
feeding: adding the stainless steel metal powder and the binder into a banburying tank, heating the banburying tank to 185 ℃, and banburying at the rotating speed of 15r/min for 0.5h; the banburying tank is cooled to 165 ℃, stearic acid is added, stirring is continued for 1h, and then extrusion granulation is carried out. Injection molding: conventional injection processes.
Thermal degreasing in a nitric acid atmosphere: degreasing temperature 110 ℃ and degreasing time: and 12h.
Sintering: and (3) a thermal degreasing process, namely heating to 600 ℃ for 4 hours, and preserving heat for 3 hours at 600 ℃. The sintering process comprises the following steps: 1290 ℃ per 3h of argon protection atmosphere sintering. The performance results are as follows:
implementation case three:
the composition of the metal powder is as follows:
feeding: adding the stainless steel metal powder and the binder into a banburying tank, heating the banburying tank to 185 ℃, and banburying at the rotating speed of 15r/min for 0.5h; the banburying tank is cooled to 165 ℃, stearic acid is added, stirring is continued for 1h, and then extrusion granulation is carried out. Injection molding: conventional injection processes.
Thermal degreasing in a nitric acid atmosphere: degreasing temperature 110 ℃ and degreasing time: and 12h.
Sintering: and (3) a thermal degreasing process, namely heating to 600 ℃ for 4 hours, and preserving heat for 3 hours at 600 ℃. The sintering process comprises the following steps: 1290 ℃ per 3h of argon protection atmosphere sintering. The performance results are as follows:
the table below shows the room temperature mechanical properties of high strength austenitic stainless steel, which strength is significantly better than conventional austenitic stainless steels such as 304 and 316.
Mechanical properties of injection molded 316 stainless steel: the tensile strength is more than or equal to 440Mpa, the yield strength is more than or equal to 110Mpa, the elongation is more than or equal to 50%, and the hardness is 120HV.
The austenitic stainless steel has lower hardness strength and limited application range on the premise of meeting the requirements of corrosion resistance and non-magnetism. The traditional austenitic stainless steel with high manganese and nitrogen is not suitable for the field of metal powder injection molding, because nitrogen element in the material can only permeate in sintering, the product structure is different, nitriding effects of different parts are different, the process control is complex, nitride can be separated out when the sintering process is cooled, the nitride is re-dissolved in a matrix through a heat treatment process to improve corrosion resistance and non-magnetism, and the whole process flow is complex.
The invention adjusts the material composition based on the traditional high-strength austenitic stainless, so that the material does not need nitriding in the sintering process, has better strength and hardness performance on the premise of having good corrosion resistance and non-magnetic performance, and does not need a heat treatment process after sintering.
By adding a certain amount of Ni element into the material, the material can be fully austenitized in a non-nitrogen environment, so that the purpose of non-magnetism is achieved, on one hand, the corrosion resistance is improved, on the other hand, the tendency of forming continuous network carbide can be weakened, and the grains are thinned, so that the material does not need nitriding during sintering, does not need heat treatment, and can achieve the purpose of non-magnetism and higher hardness.
It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (6)
1. A high strength austenitic stainless steel powder characterized by comprising the following components: calculated according to the weight percentage, the carbon content is less than or equal to 0.10wt percent, the oxygen content is less than or equal to 0.20wt percent, the nitrogen content is less than or equal to 0.20wt percent, cr:15% -17%, mn:6% -8%, mo:3% -5%, ni:5% -11%, si: less than or equal to 1.0 percent, P: less than or equal to 0.03 percent, less than or equal to 0.03 percent of S and the balance of Fe.
2. The high strength austenitic stainless steel powder of claim 1, wherein said powder has a tap density of 4.5g/cm 3 -5.0g/cm 3 Bulk density of 3.9g/cm 3 -4.4g/cm 3 。
3. A high strength austenitic stainless steel powder according to claim 1 or 2, characterized in D10:3-5 μm, D50:11-14 μm, D90:25-28 μm.
4. A preparation method of a powder injection molding product is characterized in that the temperature of an internal mixer is set to 170-190 ℃, the stirring rotation speed is 15-20 r/min, stainless steel powder, a polymer binder and a coupling agent according to any one of claims 1-3 are added, stirring is carried out for 0.5-2 h, then the temperature is reduced to 160-180 ℃, a lubricating dispersant is added, stirring is continued for 0.5-2 h, the mixed bulk feed is obtained, the granulating is started, the granulating extrusion rotation speed is 10-20 r/min, the granulating rotation speed is 10-20 r/min, the injection feed is obtained, and the finished product is prepared through degreasing sintering.
5. The method for preparing a powder injection molded product according to claim 4, wherein the degreasing sintering process is as follows: the blank after degreasing is put into a sintering furnace, the temperature is raised to 400-600 ℃ for 1-6 h, the temperature is kept for 2-8 h at 400-600 ℃, the residual polymer adhesive is removed through heating decomposition, the adhesive is completely removed through thermal degreasing, the temperature is continuously raised to the sintering temperature, and the sintered compact finished product is obtained after sintering, heat preservation and cooling.
6. A sintered metal powder product obtained by the method of claim 4 or 5, wherein the tensile strength is not less than 500MPa, the yield strength is not less than 200MPa, the elongation is not less than 40%, the hardness is not less than 150HV1, and the magnetic permeability is not more than 1.01.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310153679.7A CN116083819A (en) | 2023-03-20 | 2023-03-20 | High-strength austenitic stainless steel powder and preparation method thereof |
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| CN202310153679.7A CN116083819A (en) | 2023-03-20 | 2023-03-20 | High-strength austenitic stainless steel powder and preparation method thereof |
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| US20150376729A1 (en) * | 2013-02-28 | 2015-12-31 | Nisshin Steel Co., Ltd. | Austenitic stainless steel sheet and method for producing high elastic limit nonmagnetic steel material using the same |
| CN105537582A (en) * | 2016-03-03 | 2016-05-04 | 上海材料研究所 | 316L stainless steel powder for 3D printing technology and preparation method thereof |
| CN107838414A (en) * | 2017-10-20 | 2018-03-27 | 福州市富恒新材料有限公司 | A kind of high convergency non-magnetic rustproof powdered steel and its manufacture method |
| CN110129658A (en) * | 2019-05-27 | 2019-08-16 | 北京科技大学 | A kind of high manganese nitrogen-free type high-strength and high ductility anti-hydrogen embrittlement austenitic stainless steel and preparation method |
| CN111299588A (en) * | 2020-03-20 | 2020-06-19 | 江苏精研科技股份有限公司 | Corrosion-resistant steel powder and preparation process of feeding and corrosion-resistant steel complex parts |
| CN113737091A (en) * | 2021-07-22 | 2021-12-03 | 洛阳双瑞特种装备有限公司 | Steel for low-magnetism high-strength corrosion-resistant fastener and fastener |
| KR20220071807A (en) * | 2020-11-24 | 2022-05-31 | 주식회사 포스코 | High strength, non-magnetic austenitic stainless steel and manufacturing method thereof |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150376729A1 (en) * | 2013-02-28 | 2015-12-31 | Nisshin Steel Co., Ltd. | Austenitic stainless steel sheet and method for producing high elastic limit nonmagnetic steel material using the same |
| CN105537582A (en) * | 2016-03-03 | 2016-05-04 | 上海材料研究所 | 316L stainless steel powder for 3D printing technology and preparation method thereof |
| CN107838414A (en) * | 2017-10-20 | 2018-03-27 | 福州市富恒新材料有限公司 | A kind of high convergency non-magnetic rustproof powdered steel and its manufacture method |
| CN110129658A (en) * | 2019-05-27 | 2019-08-16 | 北京科技大学 | A kind of high manganese nitrogen-free type high-strength and high ductility anti-hydrogen embrittlement austenitic stainless steel and preparation method |
| CN111299588A (en) * | 2020-03-20 | 2020-06-19 | 江苏精研科技股份有限公司 | Corrosion-resistant steel powder and preparation process of feeding and corrosion-resistant steel complex parts |
| KR20220071807A (en) * | 2020-11-24 | 2022-05-31 | 주식회사 포스코 | High strength, non-magnetic austenitic stainless steel and manufacturing method thereof |
| CN113737091A (en) * | 2021-07-22 | 2021-12-03 | 洛阳双瑞特种装备有限公司 | Steel for low-magnetism high-strength corrosion-resistant fastener and fastener |
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