CN114540722B - Injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment - Google Patents
Injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment Download PDFInfo
- Publication number
- CN114540722B CN114540722B CN202210172381.6A CN202210172381A CN114540722B CN 114540722 B CN114540722 B CN 114540722B CN 202210172381 A CN202210172381 A CN 202210172381A CN 114540722 B CN114540722 B CN 114540722B
- Authority
- CN
- China
- Prior art keywords
- injection molding
- sintering
- sintered
- magnetic
- solution treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 48
- 239000012778 molding material Substances 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 166
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 74
- 238000005245 sintering Methods 0.000 claims abstract description 67
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 37
- 239000000243 solution Substances 0.000 claims abstract description 30
- 150000003839 salts Chemical class 0.000 claims abstract description 22
- 239000007921 spray Substances 0.000 claims abstract description 22
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 21
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 15
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 12
- 230000035699 permeability Effects 0.000 claims abstract description 12
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 18
- 238000005121 nitriding Methods 0.000 claims description 13
- 239000006104 solid solution Substances 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 150000004767 nitrides Chemical class 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 20
- 238000005260 corrosion Methods 0.000 description 19
- 230000007797 corrosion Effects 0.000 description 19
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 18
- 238000005498 polishing Methods 0.000 description 15
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010955 niobium Substances 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- 239000011651 chromium Substances 0.000 description 11
- 239000011572 manganese Substances 0.000 description 10
- 230000007935 neutral effect Effects 0.000 description 10
- 229910000734 martensite Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 241000590428 Panacea Species 0.000 description 5
- 239000012298 atmosphere Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 230000005389 magnetism Effects 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241001469654 Lawsonia <weevil> Species 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
- 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
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C22C38/18—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
-
- 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
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C21D2211/008—Martensite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to an injection molding material G19, a preparation method and application thereof in manufacturing of wearable equipment, and discloses a non-magnetic injection molding material G19, which is characterized in that the mass percentage of each chemical element of the material is as follows: 19wt% Cr,7.0wt% Ni,2wt% Mn,5.0wt% Cu,0.8 to 1.5wt% Nb,0.02wt% C,0.4wt% Si, the balance Fe, and unavoidable impurity elements. The components of the non-magnetic injection molding material G19 are mixed and atomized to prepare powder, the powder is prepared into a blank according to an injection molding process, and the blank is subjected to nitridation sintering in a nitrogen atmosphere at 1340 ℃; the sintering nitrogen content of G19 is 9800-10000 ppm, and the sintering magnetic permeability is 1.008. The hardness Hv of the material after the solution treatment is 200-230 MPa, the magnetic conductivity of the material is 1.00, and the material is not corroded within 500 hours of salt spray resistance.
Description
The application is a divisional application, and the application date of the original application is 2020-08-04, the application number is 2020107746704, and the invention and creation name is' an injection molding material G19, a preparation method and application thereof in manufacturing of wearable equipment.
Technical Field
The invention relates to a powder metal material, in particular to an injection molding material G19, a preparation method and application thereof in manufacturing of wearable equipment, and belongs to the technical field of powder metallurgy and intelligent manufacturing.
Background
The traditional metal wearing equipment is generally manufactured by a machining method and is expensive. In the current information society, the simple and diverse information interaction equipment is full of people's daily life, and the wearing equipment suitable materials which are convenient to process and have excellent performance are needed at present.
The wearable equipment is produced by adopting an injection molding method, and the requirement of large-scale production can be met. The injection molding process can achieve production costs that are about 1/10 to 1/100 of the cost of conventional machining processes. Moreover, for 3C parts with complex structures, the conventional machining method and CNC technology cannot realize mass production in a short time, and most of the parts with complex structures cannot be machined by the conventional methods.
However, when some conventional materials such as 904L, 316L, and nitride sintered conventional 17-4PH steel, PANACEA, etc., are sintered from injection molded powder to form parts, the original materials are often difficult to apply directly due to various difficulties.
904L is a super austenitic steel, a typical application being the case of a lawsonia watch. As a forging material, the material has good compactness, and the density of the material is 8.0g/cm 3 The corrosion resistance is good, and the hardness of the sintered material is in the Hv180 level. However, the fully austenitic steel material produced by the sintering method cannot be polished because of many voids on the surface and in the volume of the sintered part.
316L is a corrosion resistant stainless steel material which is very widely used. 316L of powder material can be sintered into a sintered piece with high compactness. But sintered parts of high density, e.g. sintered densities greater than 7.94g/cm 3 (316L theoretical density 7.98g/cm 3 ) However, the material always has certain magnetism, such as the magnetic permeability of 1.02-1.05, and the non-magnetic material cannot be sintered to be compact by a powder liquid phase sintering method. The sintered weak magnetic property can attract parts by using a weak magnet (ferrite), and meanwhile, the weak magnetic property can generate unpredictable signal interference on the operation of the current high-frequency wireless communication equipment, and particularly in 5G and 6G communication, the interference of the equipment on communication or operation signals by materials can limit the application of the materials. Another significant disadvantage of the 316L material is that the hardness of the sintered low permeability material is too low, typically at Hv: 120-140, the surface is too soft, not easy to polish, and easy to scratch in the polishing manufacturing and using process of users, which affects the using performance of the wearing equipment. Therefore, 316L material is greatly applied to the mass production and application of wearable equipment partsThe limit of (2).
17-4PH, but the nitriding sintering is carried out, but the complete nitriding and austenitizing tendency or capability is a little lower, so the nitriding sintering process is relatively complicated to control, and the sintering condition is not in place, so that the sintered material can show certain magnetism. The neutral salt spray corrosion resistance of the nitrided 17-4ph materials is also low, generally not exceeding 40 hours. The lower corrosion resistance makes the use of the 17-4PH nitriding material on wearing equipment difficult to break through. The material volume also shows porous characteristic when the material is subjected to nitriding sintering at 17-4PH, and the polishing effect is common.
PANACEA is also a nitrided and sintered steel which is free of magnetism and nickel after being nitrided and sintered. The final hardness Hv of the material is 280-320, the yield is 600-750 MPa, and the salt spray corrosion resistance of the material is superior to that of nitrided sintered 17-4PH steel. However, the hardness of this steel is too high, and the injection-sintered parts are difficult to be CNC-machined in a small amount. The sintered piece made of the material has more pores distributed in the volume than the nitrided and sintered 17-4PH steel, and the surface polishing value is low. The steel is also difficult to apply on a large scale on modern wearable devices.
Therefore, the development of a material which is non-magnetic, has higher hardness, is easier to process (Hv 180-240, which shows the balance point of wear resistance and processability), has compact and easily polished surface, good corrosion resistance (the neutral salt spray resistance test is more than 100 hours) and yield strength higher than 316L has practical significance for expanding and promoting the development of the 5G information industry.
Disclosure of Invention
The object of the present invention is to provide an injection molding material G19 to solve the problems of the prior art.
The invention also provides application of the injection molding material G19 in manufacturing of wearable equipment.
The technical scheme adopted by the invention for solving the technical problem is as follows:
an injection molding material G19 comprises the following chemical elements in percentage by mass: 16 to 21wt% Cr,4 to 7wt% Ni,0 to 4wt% Mn,2 to 5wt% Cu,0.5 to 3.0wt% Nb, C.ltoreq.0.1 wt%, si.ltoreq.1 wt%, the balance Fe, and unavoidable impurity elements. The material is atomized into powder and sintered in argon, hydrogen and nitrogen atmosphere. The steel is a high-quality corrosion-resistant martensitic steel after being sintered in argon and hydrogen atmosphere at the temperature of 1280-1340 ℃; the nitrogen content can reach 0.5-1.0 wt% after sintering in nitrogen atmosphere under proper conditions, and the sintered material is compact. And then the material is a nonmagnetic material after solution treatment, and the surface hardness Hv: 180-240, good corrosion resistance, excellent mechanical strength and plasticity, and can be widely used for wearing equipment represented by 5G and other electronic consumer products, and more industrial fields.
Preferably, the material comprises the following chemical elements in percentage by mass: 18 to 20wt% Cr,5.0 to 6.0wt% Ni,1 to 2wt% Mn,3.5 to 4.5wt% Cu,1.0 to 2.0wt% Nb, C.ltoreq.0.03 wt%,0.2 to 0.5wt% Si, the balance being Fe, and inevitable impurity elements.
Preferably, the material comprises the following chemical elements in percentage by mass: 18-20wt% of Cr, 4.5-5.5wt% of Ni, 1.0-2.0 wt% of Mn, 3.5-4.5wt% of Cu, 0.8-1.2wt% of Nb, C.ltoreq.0.03 wt%, 0.2-0.5wt% of Si, the balance being Fe, and unavoidable impurity elements. Under the condition of ensuring the suitability for manufacturing the wearable equipment, the contents of nickel and niobium are properly reduced so as to reduce the cost.
Preferably, the material comprises the following chemical elements in percentage by mass: 18-20wt% Cr, 4.5-5.5wt% Ni, 0-0.5 wt% Mn, 3.5-4.5wt% Cu, 0.8-1.2wt% Nb, C ≦ 0.03wt%, 0.2-0.5wt% Si, the balance Fe, and unavoidable impurity elements. The sintering temperature of the material can be adjusted (increased) by properly reducing the content of manganese.
Preferably, the density of the material after sintering in a non-nitrogen (hydrogen, argon, or the like) atmosphere is in the range of 7.75 to 7.85g/cm 3 The sintered material is a magnetic martensite material. Preferably, the yield strength of the sintered material is 650-900 MPa, the tensile strength is 1000-1200 MPa, the elongation is 8-15%, and the microhardness is 290-330. The material has good corrosion resistance and is high-quality martensitic stainless steel.
Preferably, the density of the material after being sintered in nitrogen atmosphere is 7.75-7.85 g/cm 3 High yield strength in sintered state320-480 MPa, 620-780 MPa of tensile strength, 40-50% of elongation, 210-270 of microhardness, less than or equal to 1.02 of magnetic conductivity of the sintered material, and compact section of the material.
Preferably, G19 has a density in the range of 7.75 to 7.85G/cm after sintering in a nitrogen atmosphere and solution treatment 3 Yield strength of 280-420 MPa, tensile strength of 580-780 MPa, elongation of 30-45%, microhardness Hv:180 to 240, the magnetic conductivity after the solution treatment is 1.00, the magnetic material is in a non-magnetic state, and the section is compact.
The preparation method of the non-magnetic injection molding material comprises the steps of sintering the injection molding material G19 at 1280-1350 ℃ in a nitrogen atmosphere, and carrying out solution treatment at 950-1200 ℃ to obtain the non-magnetic injection molding material.
The application of the non-magnetic injection molding material G19 in manufacturing of wearable equipment.
A method for preparing wearable equipment by using the injection molding material G19 comprises the following steps:
a. g19 is made into a blank part through injection molding, and is sintered in a nitrogen atmosphere of 0.65 to 1atm, the sintering temperature is controlled to be 1280 to 1350 ℃, and the nitrogen content in the sintered material is controlled to be 0.6 to 1.0wt percent;
b. and (3) performing solid solution treatment on the sintered material in an ammonia decomposition furnace at 950-1200 ℃ to decompose nitrides in the material, homogenizing the nitrogen distribution in the material, wherein the nitrogen content after the solid solution treatment is in the range of 0.6-0.9 wt%, and obtaining the non-magnetic wearable equipment or parts thereof.
Compared with the prior art, the invention has the advantages that:
1. the injection molding material G19 is a material easy to nitride and sinter, and is characterized by high strength, proper surface hardness of the material, easy nitridation and sintering, good polishing effect of sintered parts and good corrosion resistance;
2. g19 is subjected to nitrogen sintering and solution treatment, and the corrosion resistance time in a neutral salt spray test exceeds 100 hours. The optimized G19 nitride sintered and solution treated material can reach or exceed 500 hours in a long-time neutral salt spray test. The surface and the section of the material subjected to sintering and solution treatment are dense, and the surface polishing effect is good.
3. The non-magnetic injection molding material has the advantages of non-magnetism, higher hardness, easier processing (Hv 180-240, which shows a balance point of wear resistance and processability), compact and easily polished surface, good corrosion resistance (the neutral salt spray resistance test is more than 100 hours), high yield strength and the like, so the non-magnetic injection molding material is suitable for manufacturing wearable equipment and parts thereof.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a photograph of a sintered cross-section of 904L of material;
FIG. 2 is a metallographic photograph of the surface of a fused material of 904L of material;
FIG. 3 is a metallographic photograph of a sintered compact cross section of a higher permeability 316L material;
FIG. 4 is a metallographic photograph of a sintered porous cross-section of the 316L material at low permeability;
FIG. 5 is a metallographic photograph of a porous cross-section of a Panacea sintered material;
FIG. 6 is a photograph of a 17-4PH nitrided material 27H salt spray coupon;
FIG. 7 is a photograph of a sample of G19 nitrided sintered material 360H salt spray;
FIG. 8 is a metallographic photograph of the surface of the G19 nitrided sintered material;
FIG. 9 is a metallographic photograph of the surface of a 17-4PH sintered material;
FIG. 10 is a metallographic photograph of a section of a G19 sintered material;
FIG. 11 is a metallographic cross-sectional view of a 17-4PH sintered material;
FIG. 12 is a picture of a tensile bar after argon sintering of G19;
FIG. 13 is a photograph of a G19 nitrided sintered performance test bar wherein a is a sintered bar under 1 atmosphere nitrogen (continuous furnace); b is a sintered sample strip under the condition of 80KPa nitrogen pressure (vacuum partial pressure furnace);
FIG. 14 is a gold phase diagram after sintering of G19 and 17-4PH, wherein a is a diagram of G19 nitrogen sintered austenite, b is a diagram of 17-4PH material nitrogen sintered austenite, and c is a diagram of G19 hydrogen sintered martensite;
FIG. 15 is a photograph of a part of a wearing apparatus made of G19 after polishing.
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 practice of the invention is not limited to the following examples, and that any variations and/or modifications may be made thereto without departing from the scope of the invention.
In the present invention, all parts and percentages are by weight, unless otherwise specified, and the equipment and materials used are commercially available or commonly used in the art. The methods in the following examples are conventional in the art unless otherwise specified.
Comparative example 1:904L
A904L stainless steel material with the main component of Ni25Cr21Mo4.5Cu1.5Mn0.3Si0.4 is atomized by supersonic gas to be prepared into powder, the granularity D90 of a finished product is 21 microns, and the oxygen content is 781ppm. The theoretical density of the material is 8.0g/cm 3 . FIG. 1 shows that the sintered density is 7.85g/cm at 1360 deg.C 3 The sintering density is general, but the part has serious deformation; the right part in FIG. 1 is sintered at 1350 ℃ and has a density of only 7.65g/cm 3 The sintered material has a large number of voids in its cross section.
The inventors have made a lot of adjustments to the sintering process of 904L powder, and as a sintering effect of the all-austenitic steel, the material has been partially fused or severely deformed at a high sintering density, and even at such a sintering density, a large number of voids remain after surface polishing. If the sintering temperature is properly reduced, for example, 5 to 10 ℃, the sintering density of the material is greatly reduced. FIG. 2 shows the polishing effect of the surface of the sintered material, and a large number of sintered voids exist on the surface of the material in FIG. 2.
Therefore, the 904L material is not suitable as a polishing material for the powder metallurgy technology.
Comparative example 2:316L
A316L stainless steel powder material with the main component of Cr16.8Ni11.3Mo2.5Mn0.3Si0.4C0.02 is made into a blank by injection molding, and is sintered for 3 hours at the constant temperature of 1380 ℃ under the condition of 10KPa argon partial pressure. After sintering, 2 different cooling processes of fast cooling and slow cooling are respectively adopted to obtain parts with different austenite phases. The fast cooling (beginning of fast cooling at 1050 ℃) group has little ferrite structure and presents very high sintered density of 7.97g/cm 3 Sintered body permeability 1.08, surface hardness Hv:145, the section of the material is very compact, and the polishing effect is good.
The distribution of the cross-section voids is as shown in FIG. 3. The material sintered density of a slow cooling group (starting fast cooling at 850 ℃) is 7.78g/cm 3 The density is greatly reduced, the sintered material is nonmagnetic, the magnetic conductivity is 1, and the surface hardness Hv:123, the sintered cross section of the material has a lot of voids and cannot be polished, as shown in fig. 4.
Therefore, the sintered 316L material can exhibit high magnetic properties during densification sintering, while a non-magnetic material is difficult to densify. The overall hardness of the 316L sintered material is also lower. These are key issues for the use of 316L material on wearable devices.
Comparative example 3: panancea (nitrided sintered high manganese steel)
Sintering gas atomized powder (powder particle size D90 is 19 microns, oxygen content is 980 ppm) of PANACEA stainless steel with Cr17Mn11Mo3.5Si0.5N0.24C0.05 as main component at 1280 deg.C under 80KPa nitrogen partial pressure, and performing solid solution treatment after sintering to obtain final sintered density of 7.75g/cm 3 (higher for similar density comparison in the current industry), nitrogen content 0.75wt%, surface hardness Hv:310, sintering the solution treatment material to obtain a magnetic permeability of 1.01. This hardness is prone to scrap tooling for CNC machining and the surface hardness is already too high.
Metallographic observation is carried out on the section of the sintered material, and as shown in figure 5, shallow polishing shows that the surface gap of the material is developed. Therefore, the hardness and sintering density of the Panacea sintered material are too high to be applied to wearing devices in large quantities.
Example 1: nitridation sintering and corrosion resistance test of G19 and 17-4PH
A non-magnetic injection molding material G19 comprises the following chemical elements in percentage by mass: 19.0wt% Cr,6.0wt% Ni,2.0wt% Mn,4.0wt% Cu,1.7wt% Nb,0.02wt% C,0.4wt% Si, the balance being Fe, and unavoidable impurity elements.
17-4PH stainless steel gas atomized powder (D90: 25 μm, oxygen content 850 ppm) containing Cr17.0Ni4Cu4Nb0.35Si0.4Mn0.3C0.02 as a main component and the material G19 (same particle size and oxygen content) described in this example were each subjected to injection molding to prepare a preform, which was degreased and then sintered in a nitrogen furnace at 1340 ℃ for 90 minutes at a constant temperature. After sintering, the material is subjected to solution treatment in an ammonia decomposition furnace at 1100 ℃. The nitrogen content, density, salt spray corrosion resistance, etc. of the 2 materials were then tested, and the results are shown in table 1.
TABLE 1 comparison of performance of G19 and 17-4PH nitriding sinters
The results in Table 1 show that, when sintered under the same conditions, the sintered density of the material G19 of the present invention is equivalent to 17-4PH, which is slightly higher than that of the conventional material 17-4PH, and that, in terms of the sintered nitrogen content and the nitrogen content after solution treatment, the nitriding capability of the material G19 of the present invention is significantly higher than that of the conventional material 17-4PH during nitriding sintering. Since 30 times the nitrogen content of an austenitic material is the nickel equivalent, the sintered magnetic properties and the final magnetic properties of the material after solution treatment are significantly reduced after nitriding sintering or solution treatment, since the nitrogen content of G19 is about 0.3wt% higher, which corresponds to an increase in G19 nickel equivalent of about 9wt% higher than 17-4PH.
The final surface hardness of the inventive material G19 was Hv: 180-220, meets the hardness requirements of an optimal both polished and properly CNC machined part.
And testing the sintered part subjected to the solution treatment according to the national neutral salt spray test standard GB/T2423.17-2008. The test result is that the nitrided 17-4PH material has large area rusting found between the test time and 27 hours, as shown in FIG. 6; the nitrided G19 steel had a test time of 120 hours without rusting, as shown in FIG. 7, and had a long test time of 15 days without rusting during the test. Example 2: g19 and 17-4PH sintered compactness test
The two sintered materials obtained in example 1 were subjected to surface polishing and cross-sectional polishing, respectively, and the results are shown in table 2.
TABLE 2 comparison of the porosity of the surface and cross-section of the inventive materials G19 and 7-4PH after nitriding sintering and solution treatment
| Material | Sintered Density, g/cm 3 | Surface porosity,% of | Cross-sectional void ratio,% |
| G19 | 7.85 | 0.1～0.3 | ≤0.5 |
| 17-4PH | 7.81 | 0.4～1.1 | 0.5～1.5 |
FIG. 8 and FIG. 9 show the void condition on the surface of the G19 and 17-4PH sintered materials, respectively, and FIG. 10 and FIG. 11 show the void condition on the cross section of the G19 and 17-4PH sintered materials, respectively.
The results show that the surface porosity and the cross-sectional porosity of the sintered material G19 are better than those of the 17-4PH material under the same sintering and solution treatment conditions. The polishing performance of the material of the invention is far better than 17-4PH.
Example 3:
a non-magnetic injection molding material G19 comprises the following chemical elements in percentage by mass: 19.0wt% Cr,5.0wt% Ni,1.7wt% Mn,4.0wt% Cu,1.0wt% Nb,0.02wt% C,0.4wt% Si, the balance being Fe, and unavoidable impurity elements. Proportioning the raw materials according to the formula, mixing the raw materials, atomizing the mixture to prepare powder, preparing a blank according to an injection molding process, performing nitrogen sintering in a nitrogen atmosphere at 1340 ℃, and detecting that the sintering density is 7.85g/cm 3 The sintered nitrogen content is 7600-7900 ppm, the magnetic conductivity of the material after solution treatment is 1.00, and the material is in a non-magnetic state. The hardness Hv of the obtained G19 material is 190-230, and the corrosion resistance time of a neutral salt spray test exceeds 120 hours.
The material cost of the formula is properly reduced.
Example 4:
a non-magnetic injection molding material G19 comprises the following chemical elements in percentage by mass: 19.0wt% Cr,5.0wt% Ni,0.05wt% Mn,4.0wt% Cu,1.0wt% Nb,0.02wt% C,0.3wt% Si, the balance being Fe, and unavoidable impurity elements. Mixing the above materials at a certain ratio, atomizing into powder, making into blank by injection molding, azotizing at 1345 deg.C in nitrogen atmosphere, and testing the sintered density to be 7.85g/cm 3 The sintered nitrogen content is 7100-7400 ppm, and the magnetic permeability of the material after solution treatment is 1.00, which is in a non-magnetic state. The hardness Hv of the obtained G19 material is 190-230, and the corrosion resistance time of a neutral salt spray test exceeds 120 hours.
The material of the formula properly increases the sintering temperature and reduces the material cost.
Example 5:
a non-magnetic injection molding material G19 comprises the following chemical elements in percentage by mass: 16.1wt% Cr,5.5wt% Ni,0.8wt% Mn,5.0wt% Cu,0.8wt% Nb,0.02wt% C,0.3wt% Si, the balance Fe, and unavoidable impurity elements. Proportioning according to the formula and mixingMixing, atomizing into powder, making into blank according to injection molding process, nitriding and sintering at 1340 deg.C in nitrogen atmosphere, comparing it with 17-4PH stainless steel material containing Cr16.5Ni4Cu4Nb0.35Si0.4Mn0.3C0.02, and detecting that G19 has sintering density of 7.82G/cm 3 The content of sintering nitrogen is 6300-6500 ppm, and the magnetic conductivity of the material in a sintering state is 1.01; sintered density of 17-4PH of 7.78g/cm 3 The sintered nitrogen content is 4300ppm, and the magnetic permeability of the sintered material is 1.04. The magnetic permeability of the 2 materials after solution treatment is 1.00, and the materials are in a non-magnetic state. The hardness Hv of the obtained G19 material is 190-230, and the corrosion resistance time of the neutral salt spray test exceeds 100 hours, but the salt spray resistance time of the contrast 17-4Ph is about 30 hours.
Example 6:
a non-magnetic injection molding material G19 comprises the following chemical elements in percentage by mass: 21wt% Cr,4.0wt% Ni,4wt% Cu, 2.0wt% by weight, nb,0.02wt% by weight, C,1.0wt% Si, the balance being Fe, and unavoidable impurity elements. Proportioning the raw materials according to the formula, mixing the raw materials, atomizing the mixture to prepare powder, preparing a blank according to an injection molding process, and performing nitrogen sintering at 1325 ℃ in nitrogen atmosphere. The detection shows that the sintering nitrogen content of G19 is 9500-9800 ppm, the sintering magnetic conductivity is 1.003, the hardness Hv of the material after solution treatment is 180-190 MPa, the magnetic conductivity of the material is 1.00, and the salt spray resistant time of the material is more than 100 hours.
The contents of chromium and manganese in the material are improved, and the nitrogen content of the nitriding sintering material is obviously improved.
Example 7:
a non-magnetic injection molding material G19 comprises the following chemical elements in percentage by mass: 19wt% Cr,7.0wt% Ni,2wt% Cu,3.0wt% Nb,0.02wt% Si, 0.4wt% Si, the balance Fe, and unavoidable impurity elements. Proportioning the raw materials according to the formula, mixing the raw materials, atomizing the mixture to prepare powder, preparing a blank according to an injection molding process, and performing nitrogen sintering at 1340 ℃ in a nitrogen atmosphere. The detection shows that the sintering nitrogen content of G19 is 9800-10000 ppm, the sintering magnetic conductivity is 1.008, the hardness Hv of the material after solution treatment is 200-230 MPa, the magnetic conductivity of the material is 1.00, and the material does not rust within 500 hours of salt spray resistance time.
Metallographic observation of the material shows that dispersed Nb is precipitated in the material after solution treatment. A large number of researches show that the higher the Nb content in the material, the better the corrosion resistance of the material. When the Nb content exceeds 1.5wt%, nb begins to diffuse and precipitate in the material in a simple substance state. As a combination of corrosion resistance and economy, it is an optimum choice to control the Nb content of the material of the invention to be in the range of 0.8 to 1.5 wt%.
Example 8:
the material G19 of the present invention in example 1 was injected and sintered into a mechanical tensile test specimen (national metallic material tensile test standard GB/T228.1-2010), and argon gas was sintered at 1280 ℃ to obtain the mechanical properties of the material of the present invention under the condition of the martensite structure, as shown in table 3.
TABLE 3
| Sintered Density, g/cm 3 | Hardness Hv | Yield strength, MPa | Tensile strength, MPa | Elongation percentage of% |
| 7.75～7.80 | 300～320 | 700～900 | 1000～1200 | 9～15 |
A picture of a tensile sample bar of the martensitic steel of the present invention is shown in FIG. 12.
The martensite steel is subjected to a neutral salt spray resistance test, and the salt spray time reaches 100 hours.
Example 9: mechanical properties of Nitrogen atmosphere sintered Material of the invention
The inventive materials of example 1 and example 3 were sintered in a nitrogen atmosphere to give tensile specimens having densities in the range of 7.82 to 7.86g/cm 3 . After solution treatment, the mechanical properties of the nitrogen atmosphere sintering were tested as shown in table 4.
TABLE 4 mechanical properties of the inventive materials after sintering in nitrogen atmosphere and solution treatment
| Sintered Density, g/cm 3 | Hardness Hv | Yield strength, MPa | Tensile strength, MPa | Elongation percentage of% |
| 7.81～7.86 | 180～240 | 300～450 | 600～750 | 30～45 |
The data show that the hardness of the nitrided and sintered material of the invention is in a proper range of Hv 180-240, the yield strength is about 2 times of 316L, the tensile strength is about 1.5 times of 316L, and the elongation index is high. The comprehensive mechanical property of the composite material is superior to 316L.
FIG. 13 shows the nitrided sintering property test bars of the materials of examples 1 and 3, wherein a is the sintered bar under nitrogen at 1 atmosphere (continuous furnace); b is a sintered sample bar under a nitrogen pressure of 80KPa (vacuum partial pressure furnace).
Example 10: metallographic analysis of the Material of the invention
The G19 material and the 17-4PH material of the invention in example 1 were sintered in a nitrogen atmosphere and subjected to solution treatment to obtain an austenite structure; the material of the invention is sintered in hydrogen atmosphere, and the obtained structure is martensite, and the metallographic phase of the martensite is respectively shown in figure 14. As can be seen from the gold phase diagram, no matter sintering is carried out in an argon atmosphere or in a nitrogen atmosphere, the ratio of the crystal grains of the material of the invention to the material of 17-4PH is very small, so that the comprehensive performance of the material can be fully exerted.
Application example 1
The material G19 of the invention is finally polished to obtain wearing equipment shells with 2 shapes after atomization powder preparation, feeding preparation, injection molding, degreasing, nitridation sintering and solution treatment, and the picture is shown in figure 15: square watchcase (left) and round watchcase (right). The detection shows that the prepared product part material has no magnetism, the hardness Hv is in the range of 180-220, and the salt spray resistance testing time is over 100 hours. The pictures show that the polishing effect of the material of the invention is excellent.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
The injection molding material G19, the preparation method and the application thereof in the manufacture of wearable equipment provided by the invention are described in detail above. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. A non-magnetic injection molding material G19 is characterized in that the material comprises the following chemical elements in percentage by mass: 19wt% Cr,7.0wt% Ni,2wt% Mn,5.0wt% Cu,0.8 to 1.5wt% Nb,0.02wt% C,0.4wt% Si, the balance Fe, and unavoidable impurity elements; the density range of the non-magnetic injection molding material G19 is 7.75 to 7.85g/cm 3 ；
Mixing the above components, atomizing into powder, making into blank according to injection molding process,
nitriding and sintering at 1340 deg.c in nitrogen atmosphere; the sintering nitrogen content of G19 is 9800 to 10000ppm, and the sintering magnetic permeability is 1.008;
and carrying out solid solution treatment after the nitridation sintering, wherein the hardness Hv of the material after the solid solution treatment is 200-230 MPa, the magnetic conductivity of the material is 1.00, and the material is not rusted within 500 hours of salt spray resistance.
2. The non-magnetic injection molding material G19 according to claim 1, characterized in that: the Nb content in the material was 3.0 wt%.
3. A preparation method of a non-magnetic injection molding material is characterized by comprising the following steps: the non-magnetic injection molding material G19 of claim 1 is prepared by mixing and atomizing the components to form powder, preparing a blank according to an injection molding process, and performing nitrogen sintering at 1340 ℃ in a nitrogen atmosphere; the sintering nitrogen content of G19 is 9800-10000 ppm, and the sintering magnetic permeability is 1.008.
4. The method for preparing a non-magnetic injection molding material according to claim 3, wherein: and carrying out solid solution treatment after the nitridation sintering, wherein the hardness Hv of the material after the solid solution treatment is 200-230 MPa, the magnetic conductivity of the material is 1.00, and the material is not rusted within 500 hours of salt spray resistance.
5. Use of the non-magnetic injection molding material G19 of claim 1 in manufacturing of wearable equipment.
6. A method of preparing an injection moulding material G19 according to claim 1 suitable for wearing equipment, characterised in that the method comprises the steps of:
a. g19 is made into a blank part through injection molding, and is sintered in a nitrogen atmosphere of 0.65 to 1atm, the sintering temperature is controlled to be 1280 to 1350 ℃, and the nitrogen content in the sintered material is controlled to be 0.6 to 1.0wt%;
b. and (3) carrying out solution treatment on the sintered material in an ammonia decomposition furnace at 950-1200 ℃ to decompose the nitride in the material, homogenizing the nitrogen distribution in the material, and obtaining the nonmagnetic wearable equipment or parts thereof, wherein the nitrogen content after the solution treatment is within 0.6-0.9 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210172381.6A CN114540722B (en) | 2020-08-04 | 2020-08-04 | Injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210172381.6A CN114540722B (en) | 2020-08-04 | 2020-08-04 | Injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment |
| CN202010774670.4A CN111778456B (en) | 2020-08-04 | 2020-08-04 | An injection molding material G19, preparation method and application thereof in the manufacture of wearable devices |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010774670.4A Division CN111778456B (en) | 2020-08-04 | 2020-08-04 | An injection molding material G19, preparation method and application thereof in the manufacture of wearable devices |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114540722A CN114540722A (en) | 2022-05-27 |
| CN114540722B true CN114540722B (en) | 2023-01-20 |
Family
ID=72765772
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210172366.1A Active CN114540710B (en) | 2020-08-04 | 2020-08-04 | Non-magnetic injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment |
| CN202010774670.4A Active CN111778456B (en) | 2020-08-04 | 2020-08-04 | An injection molding material G19, preparation method and application thereof in the manufacture of wearable devices |
| CN202210172381.6A Active CN114540722B (en) | 2020-08-04 | 2020-08-04 | Injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment |
Family Applications Before (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210172366.1A Active CN114540710B (en) | 2020-08-04 | 2020-08-04 | Non-magnetic injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment |
| CN202010774670.4A Active CN111778456B (en) | 2020-08-04 | 2020-08-04 | An injection molding material G19, preparation method and application thereof in the manufacture of wearable devices |
Country Status (1)
| Country | Link |
|---|---|
| CN (3) | CN114540710B (en) |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54115615A (en) * | 1978-02-28 | 1979-09-08 | Hitachi Metals Ltd | Corrosion resistant alloy steel |
| JPS6013043A (en) * | 1983-07-05 | 1985-01-23 | Daido Steel Co Ltd | Wear- and corrosion-resistant alloy |
| JPS63169362A (en) * | 1986-12-29 | 1988-07-13 | Aichi Steel Works Ltd | Nonmagnetic tool steel |
| JPH07138713A (en) * | 1993-11-15 | 1995-05-30 | Daido Steel Co Ltd | Method for producing Fe-based alloy powder and highly corrosion-resistant sintered body |
| RU2324757C2 (en) * | 2002-09-27 | 2008-05-20 | Нано Текнолоджи Инститьют, Инк. | Nanocristalline material with austenic steel structure possessing high firmness, durability and corrosive endurance, and its production method |
| WO2015091366A1 (en) * | 2013-12-20 | 2015-06-25 | Höganäs Ab (Publ) | A method for producing a sintered component and a sintered component |
| JP2016186104A (en) * | 2015-03-27 | 2016-10-27 | 日本シリコロイ工業株式会社 | Metal power injection molding method, heat treatment method, metal powder and product |
| CN104785785A (en) * | 2015-04-01 | 2015-07-22 | 宝得粉末注射成形（常熟）有限公司 | Machining method for swing cam for car steering control system |
| EP3156155A1 (en) * | 2015-10-15 | 2017-04-19 | Höganäs AB (publ) | Iron based powders for powder injection molding |
| CN105537595A (en) * | 2015-12-28 | 2016-05-04 | 上海富驰高科技有限公司 | MIM manufacturing process for non-magnetic 17-4P stainless steel parts |
| JP7110629B2 (en) * | 2018-03-08 | 2022-08-02 | セイコーエプソン株式会社 | Metal powders, compounds, granulated powders and sintered bodies for powder metallurgy |
| US11692232B2 (en) * | 2018-09-05 | 2023-07-04 | Gregory Vartanov | High strength precipitation hardening stainless steel alloy and article made therefrom |
| CN110480015A (en) * | 2019-08-22 | 2019-11-22 | 苏州市施强医疗器械有限公司 | A kind of blank material and its technique for clamping class or retracting class surgical instrument |
-
2020
- 2020-08-04 CN CN202210172366.1A patent/CN114540710B/en active Active
- 2020-08-04 CN CN202010774670.4A patent/CN111778456B/en active Active
- 2020-08-04 CN CN202210172381.6A patent/CN114540722B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114540722A (en) | 2022-05-27 |
| CN114540710A (en) | 2022-05-27 |
| CN111778456B (en) | 2022-03-22 |
| CN111778456A (en) | 2020-10-16 |
| CN114540710B (en) | 2023-01-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2488675B1 (en) | Nitrogen containing, low nickel sintered stainless steel | |
| TW450855B (en) | Method of preparing sintered products, sintered products, and water-atomised annealed iron-based powder used in the preparation | |
| US5666634A (en) | Alloy steel powders for sintered bodies having high strength, high fatigue strength and high toughness, sintered bodies, and method for manufacturing such sintered bodies | |
| US5605559A (en) | Alloy steel powders, sintered bodies and method | |
| US5141554A (en) | Injection-molded sintered alloy steel product | |
| JP5114233B2 (en) | Iron-based sintered alloy and method for producing the same | |
| JPH0681001A (en) | Alloy steel powder | |
| CN114540722B (en) | Injection molding material G19, preparation method and application thereof in manufacturing of wearable equipment | |
| KR101014699B1 (en) | Screw or tapping screw | |
| CN118109759B (en) | High-toughness ultrahigh-strength martensitic stainless steel material and preparation method and application thereof | |
| CN116083819B (en) | A high-strength austenitic stainless steel powder and preparation method thereof | |
| US4804409A (en) | Alloy steel powder for powder metallurgy | |
| JP3351844B2 (en) | Alloy steel powder for iron-based sintered material and method for producing the same | |
| EP0334968B1 (en) | Composite alloy steel powder and sintered alloy steel | |
| JPH04165002A (en) | High compressibility cr base alloy steel powder and manufacture of high strength sintered material using it | |
| CN116970878B (en) | High-toughness and high-strength martensitic stainless steel, steel structure, and preparation method and application thereof | |
| JPS61139601A (en) | Low alloy iron powder for sintering and its manufacturing method | |
| CN112760555B (en) | Method for producing molded body having nitrided layer, and molded body produced thereby | |
| JPH0114985B2 (en) | ||
| JPH0874008A (en) | Fe-base sintered alloy excellent in toughness | |
| JP2007182593A (en) | Method for manufacturing high-nitrogen sintered alloy steel | |
| CN112458372A (en) | Iron-based prealloyed powder, iron-based diffusion-bonded powder, and iron-based alloy powder for powder metallurgy using same | |
| WO2025182224A1 (en) | Sintered component and method for manufacturing sintered component | |
| JPH11279602A (en) | Production of sintered product | |
| JPH09227982A (en) | Production of high density sintered body of austenitic stainless steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |