CN116275039B - Method for reducing hardness of 420w material by sintering mode combined with heat treatment annealing - Google Patents
Method for reducing hardness of 420w material by sintering mode combined with heat treatment annealing Download PDFInfo
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- CN116275039B CN116275039B CN202310381480.XA CN202310381480A CN116275039B CN 116275039 B CN116275039 B CN 116275039B CN 202310381480 A CN202310381480 A CN 202310381480A CN 116275039 B CN116275039 B CN 116275039B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005245 sintering Methods 0.000 title claims abstract description 38
- 239000000463 material Substances 0.000 title claims abstract description 26
- 238000000137 annealing Methods 0.000 title abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 29
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 20
- 239000010935 stainless steel Substances 0.000 claims abstract description 19
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 229910052786 argon Inorganic materials 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 239000011265 semifinished product Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 22
- 238000007493 shaping process Methods 0.000 abstract description 11
- 238000010079 rubber tapping Methods 0.000 abstract description 9
- 238000005498 polishing Methods 0.000 abstract description 8
- 238000012546 transfer Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007517 polishing process Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 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
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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
- B22F3/101—Changing atmosphere
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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
- B22F3/24—After-treatment of workpieces or articles
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- 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
- C21D1/26—Methods of annealing
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- 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
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
本发明公开了一种420w材料通过合并热处理退火的烧结方式降低硬度的方法，该方法通过调整烧结工艺降温阶段的速率，即在800℃降温阶段先保温，然后保持50℃/min的降温速率从800℃降低到500℃，接着500℃到常温随炉冷却。本发明的设计合理，将420W不锈钢材料的热处理退火过程和烧结降温阶段合并，只需要调整烧结工艺降温阶段的参数即可降低420w不锈钢材料的烧结硬度，便于后续的整形、攻牙、抛光等工序，并且无需额外采用热处理专炉退火，减少了热处理专炉的升温和降温的时间，以及减少了物料中转时间，节省了人力成本，相当于降低热处理的成本费用，且烧结后的产品尺寸、硬度稳定性都比较适合量产。The present invention discloses a method for reducing the hardness of a 420w material by combining a sintering method with heat treatment annealing. The method adjusts the rate of the cooling stage of the sintering process, that is, first keeping the temperature at 800°C, then keeping the temperature at a cooling rate of 50°C/min from 800°C to 500°C, and then cooling from 500°C to room temperature with the furnace. The design of the present invention is reasonable, and the heat treatment annealing process and the sintering cooling stage of the 420w stainless steel material are combined. The sintering hardness of the 420w stainless steel material can be reduced by adjusting the parameters of the cooling stage of the sintering process, which is convenient for subsequent shaping, tapping, polishing and other processes, and there is no need to use a special heat treatment furnace for annealing, which reduces the heating and cooling time of the special heat treatment furnace, and reduces the material transfer time, saving labor costs, which is equivalent to reducing the cost of heat treatment, and the size and hardness stability of the sintered product are more suitable for mass production.
Description
Technical Field
The invention relates to the technical field of stainless steel material processing, in particular to a method for reducing hardness of a 420w material by combining sintering modes of heat treatment annealing.
Background
The MIM-420w stainless steel is 420 'cutting tool grade' martensitic steel, is the earliest stainless steel like Brinell high chromium steel, has certain wear resistance and corrosion resistance, has higher hardness, has lower price than the stainless steel, and is suitable for the working environment with hardness requirement on the stainless steel.
The Rockwell hardness of the 420W stainless steel material subjected to common sintering treatment is 34-40 HRC, and under the condition of high hardness, if a product with large sintering deformation is to be shaped and corrected, the loss of the shaping die is high, and the shaping effect cannot reach the ideal effect. Meanwhile, tapping cannot be completed under the condition of high hardness, and the tap is damaged to be not completed yet. When the hardness exceeds 30HRC, the polishing process is also greatly affected, and the polishing productivity and yield are greatly reduced. In combination with the above, for products with shaping, tapping and surface polishing, the hardness of the common sintered stainless steel 420w material is higher, so that the manufacturing of a hand plate sample is difficult, the hand plate sample is not suitable for mass production, the hardness needs to be reduced by increasing the annealing process, the hardness reaches the hardness range of about 120HV similar to 316L or about 280HV of 17-4ph, and then the working procedures such as shaping, tapping and polishing are performed.
According to the annealing process requirement of 420W, a heat treatment annealing mode of independent furnace opening can be used, products are required to be heated to 800-850 ℃ from normal temperature, heat is preserved for 1-2 hours, the temperature is slowly reduced to 500 ℃ at 30 ℃ per minute, the products are cooled to normal temperature along with the furnace after 500 ℃, the hardness of the products can be reduced to about 160-200 HV under the condition that vacuum pumping is not required in the furnace, shaping and polishing processes are more facilitated, but the process has the defects that after the sintering furnace is out of the furnace, the products need to be reentered into the heat treatment special furnace for annealing, the transfer time of material entering and exiting the furnace is increased, the heating and cooling processes of the heat treatment special furnace are increased, the whole time in the furnace is only required to be 17-18 hours, the appearance of the products is in a brown state, and the products can be recovered after quenching and tempering hardening by heat treatment.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for reducing the hardness of a 420w material by combining sintering modes of heat treatment annealing, which takes into account the hardness requirement after annealing, is convenient for subsequent shaping, tapping, polishing and other procedures, does not need to additionally adopt a heat treatment special furnace for annealing, reduces the heating and cooling time of the heat treatment special furnace, and reduces the material transfer time.
In order to achieve the above object, the present invention provides a method for reducing hardness of 420w material by sintering combined with heat treatment annealing, comprising the steps of:
Placing 420w stainless steel blanks to be sintered into a sintering furnace, heating the furnace temperature from normal temperature to 300 ℃, preserving heat for 25-35 minutes, setting the furnace pressure to 0Pa, and setting the flow of nitrogen to 30L/min;
Continuously heating to 450 ℃ after finishing the heat preservation at 300 ℃, then preserving the heat for 85-95 minutes, and setting the flow of the introduced nitrogen to be 40L/min;
keeping the flow rate of nitrogen and the pressure in the furnace unchanged, continuously heating to 600 ℃, and preserving the temperature for 55-65 minutes;
Continuously keeping the flow of nitrogen and the pressure in the furnace unchanged, heating to 850 ℃, and preserving heat for 25-35 minutes in a vacuumizing state;
Step five, heating to 1050 ℃ in a vacuum internal combustion state, and preserving heat for 55-65 minutes;
step six, setting the pressure in the furnace to 10Pa from 0Pa, continuously heating to 1200 ℃ under the condition that argon is introduced and the flow is 15L/min, and preserving heat for 15-25 minutes;
Maintaining the flow rate of argon and the pressure in the furnace unchanged, continuously heating to 1350 ℃, and preserving the temperature for 175-185 minutes;
step eight, maintaining the flow of argon and the pressure in the furnace unchanged, and cooling to 800 ℃;
step nine, changing the state of vacuumizing and internal combustion, setting the pressure in the furnace to be 0Pa, setting the flow rate of argon to be 0L/min, and preserving heat for 55-65 minutes at 800 ℃;
Step ten, changing the furnace pressure into a forced cooling state under the conditions of 0Pa and 0L/min argon flow, and cooling to 500 ℃ at a cooling rate of 50 ℃/min;
setting the pressure in the furnace to 86Pa, and cooling to normal temperature along with the furnace under the condition that the flow of argon is 0L/min, and discharging to obtain a 420w stainless steel semi-finished product (namely a semi-finished product blank to be shaped).
Preferably, in the first step, the temperature in the furnace is heated from normal temperature to 300 ℃ for 55-65 minutes.
Preferably, in the second step, the time for heating to 450 ℃ is 55-65 minutes.
Preferably, in step three, the time to raise the temperature to 600 ℃ is 75-85 minutes.
Preferably, in step four, the time to raise the temperature to 850 ℃ is 45-55 minutes.
Preferably, in step five, the time to raise the temperature to 1050 ℃ is 55-65 minutes.
Preferably, in step six, the time to raise the temperature to 1200 ℃ is 60-70 minutes.
Preferably, in step seven, the time to raise the temperature to 1350 ℃ is 35-45 minutes.
Preferably, in step eight, the temperature is reduced to 800 ℃ for 85-95 minutes.
Preferably, in step ten, the temperature is reduced to 500 ℃ for 355-365 minutes.
Compared with the prior art, the invention has the beneficial effects that:
The invention has reasonable design and simple method, combines the heat treatment annealing process and the sintering cooling stage of the 420W stainless steel material, can reduce the sintering hardness of the 420W stainless steel material only by adjusting the parameters of the sintering process cooling stage, is convenient for the subsequent working procedures of shaping, tapping, polishing and the like, does not need to additionally adopt the heat treatment special furnace annealing, reduces the heating and cooling time of the heat treatment special furnace, reduces the material transfer time (namely the time of a converting furnace), saves the labor cost, is equivalent to the reduction of the cost of the heat treatment, and ensures that the size and the hardness stability of the sintered product are suitable for mass production.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a method for reducing the hardness of a 420w material by combining sintering modes of heat treatment annealing, which comprises the following steps:
Placing 420w stainless steel blanks to be sintered into a sintering furnace, heating the furnace temperature from normal temperature to 300 ℃ for 55-65 minutes, then preserving heat for 25-35 minutes, setting the pressure in the furnace to 0Pa, and setting the flow of nitrogen to 30L/min;
Continuously heating to 450 ℃ after finishing the heat preservation at 300 ℃ for 55-65 minutes, and then preserving the heat for 85-95 minutes, wherein the flow rate of the introduced nitrogen is set to be 40L/min;
maintaining the flow rate of nitrogen and the pressure in the furnace unchanged, continuously heating to 600 ℃ for 75-85 minutes, and then preserving heat for 55-65 minutes;
Continuously keeping the flow of nitrogen and the pressure in the furnace unchanged, heating to 850 ℃ for 45-55 minutes, and preserving heat for 25-35 minutes in a vacuumizing state;
step five, heating to 1050 ℃ in a vacuum internal combustion state for 55-65 minutes, and then preserving heat for 55-65 minutes;
Step six, setting the pressure in the furnace to 10Pa from 0Pa, continuously heating to 1200 ℃ under the condition that argon is introduced and the flow is 15L/min, and keeping the temperature for 15-25 minutes after 60-70 minutes;
maintaining the flow rate of argon and the pressure in the furnace unchanged, continuously heating to 1350 ℃ for 35-45 minutes, and then preserving the temperature for 175-185 minutes;
Step eight, maintaining the flow of argon and the pressure in the furnace unchanged, and cooling to 800 ℃ for 85-95 minutes;
step nine, changing the state of vacuumizing and internal combustion, setting the pressure in the furnace to be 0Pa, setting the flow rate of argon to be 0L/min, and preserving heat for 55-65 minutes at 800 ℃;
Step ten, changing the furnace into a forced cooling state under the conditions that the pressure in the furnace is 0Pa and the argon flow is 0L/min, and cooling to 500 ℃ at the cooling rate of 50 ℃/min, wherein the time is 355-365 minutes;
setting the pressure in the furnace to 86Pa, and cooling to normal temperature along with the furnace under the condition that the flow of argon is 0L/min, and discharging to obtain a 420w stainless steel semi-finished product (namely a semi-finished product blank to be shaped).
Comparative example 420W the parameters of the sintering process alone (without annealing process) were as follows:
on the premise of not carrying out an annealing process, the total duration of the sintering curve of the comparative example is about 22-24 hours, and the cooling time is prolonged when the sintering is carried out in a full furnace in relation to the quantity of sintered products.
In this example (preferred example), the sintering process incorporating the heat treatment annealing is as follows:
the total duration of the sintering curve in the embodiment is about 28-31 hours, and the cooling time is prolonged when the sintering curve is sintered in a full furnace in relation to the quantity of sintered products.
The total time length of the two processes is compared with that of the sintering process of the comparative example, the time length of the sintering process combined with heat treatment annealing is 22-24 hours, the time length of the sintering process combined with heat treatment annealing of the embodiment is 28-31 hours, although the sintering time length of the sintering process is increased relative to that of the comparative example, the hardness of the product sintered by the comparative example is relatively high, the subsequent annealing through a special heat treatment furnace is needed to reduce the hardness, the annealing process of the special heat treatment furnace needs to be heated to a preset temperature from normal temperature, then the heat is preserved, the temperature is reduced, the total time length from the furnace inlet to the furnace outlet is 17-18 hours, the turnover time length of the materials in the furnace inlet and the furnace outlet is not more than, and the total time length of the materials in the sintering furnace and the heat treatment furnace is only 39-42 hours.
Through multiple verification and comparison, the sintering mode of the combined heat treatment annealing of the embodiment can reduce the cycle period of one-time furnace inlet and one-time furnace outlet relative to the comparative example, namely, the material transfer time length is reduced, the labor cost is also reduced, and meanwhile, the heating stage from normal temperature to preset temperature in the heat treatment furnace is reduced, namely, the heat treatment time length in the furnace is reduced. Considering the waiting time of material turnover, the time of the embodiment is reduced at least over 11-12 hours compared with the common sintering and heat treatment special furnace annealing mode.
After the sintering process of the combined heat treatment annealing in the embodiment, the hardness range of the product can be about 200-240 HV, the average hardness is about 220HV, the hardness range is about 15% lower than the hardness of the sintered 17-4ph material, and the hardness is slightly higher than the hardness of the single open furnace heat treatment, but the requirements of shaping, tapping and polishing processes in a large scale can be met, and the uniform stability of the size and the hardness is relatively good.
In the embodiment, the sintering hardness of the 420w stainless steel material can be reduced only by adjusting the parameters of the cooling stage of the sintering process, namely the Vickers hardness of the sintered blank is reduced, the subsequent shaping, tapping, polishing and other procedures are facilitated, and after the shaping, tapping, polishing and other procedures are completed, the hardness of the 420w stainless steel material can be increased again through heat treatment quenching and tempering, so that the requirements of customers are met.
The present invention is not limited to the above embodiments, but is capable of other modifications, adaptations, alternatives, combinations and simplifications without departing from the spirit and principles of the invention.
Claims (1)
1. A method for reducing the hardness of a 420w material by sintering in combination with a heat treatment anneal, comprising the steps of:
Placing 420w stainless steel blanks to be sintered into a sintering furnace, heating the furnace temperature from normal temperature to 300 ℃, preserving heat for 25-35 minutes, setting the furnace pressure to 0Pa, and setting the flow of nitrogen to 30L/min;
Continuously heating to 450 ℃ after finishing the heat preservation at 300 ℃, then preserving the heat for 85-95 minutes, and setting the flow of the introduced nitrogen to be 40L/min;
keeping the flow rate of nitrogen and the pressure in the furnace unchanged, continuously heating to 600 ℃, and preserving the temperature for 55-65 minutes;
Continuously keeping the flow of nitrogen and the pressure in the furnace unchanged, heating to 850 ℃, and preserving heat for 25-35 minutes in a vacuumizing state;
Step five, heating to 1050 ℃ in a vacuum internal combustion state, and preserving heat for 55-65 minutes;
step six, setting the pressure in the furnace to 10Pa from 0Pa, continuously heating to 1200 ℃ under the condition that argon is introduced and the flow is 15L/min, and preserving heat for 15-25 minutes;
Maintaining the flow rate of argon and the pressure in the furnace unchanged, continuously heating to 1350 ℃, and preserving the temperature for 175-185 minutes;
step eight, maintaining the flow of argon and the pressure in the furnace unchanged, and cooling to 800 ℃;
step nine, changing the state of vacuumizing and internal combustion, setting the pressure in the furnace to be 0Pa, setting the flow rate of argon to be 0L/min, and preserving heat for 55-65 minutes at 800 ℃;
Step ten, changing the furnace pressure into a forced cooling state under the conditions of 0Pa and 0L/min argon flow, and cooling to 500 ℃ at a cooling rate of 50 ℃/min;
Setting the pressure in the furnace to 86Pa, and cooling to normal temperature along with the furnace under the condition that the flow of argon is 0L/min, and discharging the furnace to obtain a 420w stainless steel semi-finished product;
In the first step, the temperature in the furnace is heated from normal temperature to 300 ℃ for 55-65 minutes;
in the second step, the temperature is raised to 450 ℃ for 55-65 minutes;
in the third step, the temperature is raised to 600 ℃ for 75-85 minutes;
in the fourth step, the temperature is raised to 850 ℃ for 45-55 minutes;
in the fifth step, the temperature is raised to 1050 ℃ for 55-65 minutes;
in the sixth step, the temperature is raised to 1200 ℃ for 60-70 minutes;
in the seventh step, the temperature is raised to 1350 ℃ for 35-45 minutes;
In the step eight, the temperature is reduced to 800 ℃ for 85-95 minutes;
In step ten, the temperature is reduced to 500 ℃ for 355-365 minutes.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109420759A (en) * | 2017-08-28 | 2019-03-05 | 深圳市富优驰科技有限公司 | The technique for promoting the 17-4PH mechanical property of materials using vacuum sintering furnace |
| CN115415524A (en) * | 2022-08-29 | 2022-12-02 | 苏州中耀科技有限公司 | Sintering method of 17-4PH stainless steel MIM (metal-insulator-metal) part |
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| KR100633522B1 (en) * | 2005-05-27 | 2006-10-13 | 주식회사 성도 | Heat treatment method of large ship cam |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109420759A (en) * | 2017-08-28 | 2019-03-05 | 深圳市富优驰科技有限公司 | The technique for promoting the 17-4PH mechanical property of materials using vacuum sintering furnace |
| CN115415524A (en) * | 2022-08-29 | 2022-12-02 | 苏州中耀科技有限公司 | Sintering method of 17-4PH stainless steel MIM (metal-insulator-metal) part |
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