CN108277449A - A kind of heat treatment method carrying out carburizing and quenching to low-carbon alloy steel workpiece - Google Patents
A kind of heat treatment method carrying out carburizing and quenching to low-carbon alloy steel workpiece Download PDFInfo
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- CN108277449A CN108277449A CN201810156289.4A CN201810156289A CN108277449A CN 108277449 A CN108277449 A CN 108277449A CN 201810156289 A CN201810156289 A CN 201810156289A CN 108277449 A CN108277449 A CN 108277449A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/20—Carburising
- C23C8/22—Carburising of ferrous surfaces
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/04—Treatment of selected surface areas, e.g. using masks
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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Abstract
The invention discloses a kind of heat treatment methods carrying out carburizing and quenching to low-carbon alloy steel workpiece, include the following steps：(1) after being cleaned to workpiece surface, Anti-seeping technology is carried out to the surface of workpiece non-working surface；(2) it is heated to after temperature, heat preservation a period of time, Carburization Treatment and DIFFUSION TREATMENT then is carried out to workpiece at such a temperature；(3) then cooling, quenching are kept；(4) part is directly come out of the stove air-cooled；(5) after having carried out vehicle carbon-coating and destressing tempering, workpiece is quenched；(6) by oil hardening under workpiece；(7) secondary lonneal is finally carried out.This technique is to carry out case-carbonizing processing by the workpiece for fabricating low-carbon alloy steel to reduce the carbide of product to improve the case hardness of workpiece, increases the service life of product.And by the improvement to product carburizing and quenching technical, improve the performance of product.Problem that is excessive, excessive and influencing life of product and performance that the present invention overcomes carbide caused by general prior heat treatment process reduces the paralympic of product surface under the premise of ensureing the performance of product, controls the deformation of product as possible.
Description
Technical field
The present invention relates to the heat treatment methods of low-carbon alloy steel workpiece, and in particular to a kind of to be carried out to low-carbon alloy steel workpiece
The heat treatment method of carburizing and quenching.
Background technology
It is well known that internal gear is parts crucial in mechanical equipment, it, which has, is driven accurate, compact-sized, use
The advantages that long lifespan, and play a key effect for mechanical synchronization.The required precision that this allows for internal gear is high, internal gear
Influence of the minor deviations of precision to mechanical equipment is huge.
For large-scale internal gear, at work, surface load is larger, so to the requirement of its case hardness
Very high, case depth requires deeper.And when workpiece works, it is very high to the toughness reguirements of its core, and product core
There is enough intensity.So low-carbon alloy steel can be generally used, because its quenching degree is relatively low compared to for high medium carbon steel, still
Its quenched case hardness will not be very high, therefore can first carry out case-carbonizing to it, is then quenched, and is so improving surface
While hardness, core hardness can also reach it is ideal horizontal.So, surface use intensity had both been ensured, had also ensured
The use toughness of workpiece.This is the mainstream processing method to such internal gear now.
The entire large size general process route of internal gear is forging, normalizing, roughing, carburizing (antiseepage), carburizing, high temperature
The series of process flows such as tempering, vehicle carbon-coating, destressing tempering, quenching, lonneal, finishing.For large-scale internal gear
Speech, since required precision is high, this is just very big for the difficulty of product size control.And in its processing technology, heat treatment process
Process is for the performance of product, deformation size control difficulty maximum.
The main technique being heat-treated at present is：Case-carbonizing processing is carried out to low-carbon alloy steel, is passing through high tempering, vehicle
After carbon-coating, destressing tempering is quenched again.It can generally come out of the stove less than 500 DEG C in carburizing section product, strong carburizing gesture 1.2 ±
0.05%, spread carbon potential 0.8 ± 0.05%.And the 820-830 DEG C of quenching after vehicle carbon-coating and destressing tempering.
This technique has following deficiency：1. low-carbon alloy steel is come out of the stove after carburizing less than 500 DEG C, product is easy to generate a large amount of
Carbide, product works in the case of having a large amount of carbide is easy to happen fracture.2. can equally be brought when carburizing carbon potential is higher, carbon
The excessively coarse danger of compound.3. temperature when quenching and its heat preservation is too low, it is difficult to which the core hardness for improving product reduces
The service life of product, and temperature is excessively high will improve the paralympic of product surface, reduces the case hardness of product, and can increase
The deformation of big product.
Invention content
The technical problem to be solved by the present invention is to overcome the shortcomings of to mention in background above technology and defect, provide one
Kind carries out low-carbon alloy steel workpiece the heat treatment method of carburizing and quenching.
In order to solve the above technical problems, technical solution proposed by the present invention is：
A kind of heat treatment method carrying out carburizing and quenching to low-carbon alloy steel workpiece, includes the following steps：
(1) after being cleaned to workpiece surface, Anti-seeping technology is carried out to the surface of workpiece non-working surface；To workpiece non-working surface
It is to keep certain toughness because non-working surface does not need too high intensity that surface, which carries out Anti-seeping technology,.
(2) be heated to after set temperature, heat preservation a period of time, then at such a temperature to workpiece carry out Carburization Treatment and
DIFFUSION TREATMENT；Carburizing is carried out to product surface.
(3) then hardening heat is cooled to be kept the temperature；
(4) workpiece is directly come out of the stove air-cooled；It is to be easy to be formed because slow in descent of temperature part directly to be come out of the stove air-cooled
A large amount of carbide.
(5) workpiece is tempered into driving carbon-coating and destressing；
(6) quenching treatment is carried out to workpiece；
(7) by oil hardening under workpiece；
(8) secondary lonneal is finally carried out, product residual stress is fully eliminated.
The step (2) neutralizes in the step (3), and whole process is passed through methanol and liquefied gas.Methanol rises in carburization process
To the effect of diluent, liquefied gas is as the carburizer in carburizing process.
Above-mentioned method, it is preferred that the carbon potential of the Carburization Treatment is 1.0 ± 0.05%；The carbon potential of the DIFFUSION TREATMENT
It is 0.7 ± 0.05%.The carbon potential of the Carburization Treatment and the carbon potential of DIFFUSION TREATMENT are below the general carbon potential of such technique, purpose
It is to control product carbide.
Above-mentioned method, it is preferred that the carburizing and diffusion temperature are 920 ± 5 DEG C.Temperature is excessively high to cause product grains thick
Greatly, the mechanical performance of product is reduced；Temperature is too low to make the reduction of carburizing rate, increase production cost.
Above-mentioned method, it is preferred that the carburizing is 40 ± 5 minutes with the soaking time before DIFFUSION TREATMENT；The carburizing
Time ratio with DIFFUSION TREATMENT is 3: 2.Diffusion time is long to make the reduction of product surface concentration of carbon, and technology requirement is not achieved, when
Between it is too short, carbon cannot be spread, can make product surface formed carbide, therefore the time of carburizing and DIFFUSION TREATMENT ratio be 3: 2
Most preferably.Soaking time can make adjustment according to product size, it is therefore an objective to keep product bulk temperature uniform.
Above-mentioned method, it is preferred that the hardening heat is 860 ± 5 DEG C, and quenching is kept for 60 ± 5 minutes.This temperature according to
Depending on material, temperature is too low, and product is unable to complete austenitizing, it is difficult to reach required hardness after quenching, temperature crosses high product
Coarse grains influence the mechanical performance of product.And soaking time is determined according to product size.
Above-mentioned method, it is preferred that the step (2) neutralizes in the step (3), methanol be passed through flow be 3.5 ±
0.5L/h。
Above-mentioned method, it is preferred that in the step (6), the quenching treatment process uses a soaking 600 first
± 5 DEG C, 60 ± 5 minutes are kept the temperature, plays pre- heat effect so that workpiece heat penetration under austenitizing temperature；Then it uses secondary equal
820 ± 5 DEG C of heat keeps the temperature 150 ± 5 minutes, makes product austenitizing；840 ± 5 DEG C of soaking three times are finally used, keep the temperature 5 ± 1 points
Clock so that product surface hardening heat improves, and core controls the core hardness of product less than temperature.
Above-mentioned method, it is preferred that it is described during 600 ± 5 DEG C of a soaking, by nitrogen protection；It is described secondary
During 840 ± 5 DEG C of 820 ± 5 DEG C of soaking and three times soaking, whole process is passed through methanol and liquefied gas, and the flow that is passed through of methanol is 3.5
±0.5L/h；It is described during 820 ± 5 DEG C of secondary soaking and 840 ± 5 DEG C of soaking three times, carbon potential is 0.7 ± 0.05%, is prevented
Only product decarburization.
Above-mentioned method, it is preferred that in the step (7), the quenching oil temperature is 60 ± 5 DEG C, when being kept in the oil
Between be 30 ± 5min.High oil temperature reduces the quenching degree of product, and core is difficult to reach technology requirement, and oil temperature is too low, cooling rate
It is too fast, product can be made to have the risk of hardening crack in quenching.
Above-mentioned method, it is preferred that in the step (8), the parameter of the secondary lonneal is respectively：Temperature 190
± 5 DEG C, 360 ± 5min of time；170 ± 5 DEG C of temperature, 240 ± 5min of time.Lonneal ensures the use hardness of product, disappears
The stress generated in quenching except product.
This technique is to carry out case-carbonizing processing by the workpiece fabricated to low-carbon alloy steel, to improve workpiece
Case hardness, reduce the carbide of product, increase the service life of product.And by product carburizing and quenching technical
Improvement, improve the performance of product.The present invention overcomes carbide caused by general prior heat treatment process is excessive, excessive
And the problem of life of product and performance is influenced, the residual of product surface is reduced as possible under the premise of ensureing the performance of product
Austria controls the deformation of product.
Compared with the prior art, the advantages of the present invention are as follows：
1. the present invention can effectively reduce the carbide of product.
2. the present invention by the control to hardening heat and quenching and preserving heat temperature, reduces the deformation of product and guarantor as far as possible
Demonstrate,prove the performance requirement of product.
3. the present invention can effectively improve the performance of product and the service life of product.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
The first stage of Fig. 1 present invention process, carburizing process.
The second stage of Fig. 2 present invention process, quenching process.
The surface metallurgical tissue picture of the processed product of Fig. 3 present invention process.(surface texture is put without apparent carbide
Big 200 times of observations)
The surface metallurgical tissue picture of the processed product of Fig. 4 present invention process.(surface texture is put without apparent carbide
Big 500 times of observations)
Specific implementation mode
To facilitate the understanding of the present invention, the present invention is done below in conjunction with Figure of description and preferred embodiment more complete
Face meticulously describes, but protection scope of the present invention is not limited to following specific examples.
Unless otherwise defined, all technical terms used hereinafter are generally understood meaning phase with those skilled in the art
Together.Technical term used herein is intended merely to the purpose of description specific embodiment, is not intended to the limitation present invention's
Protection domain.
Unless otherwise specified, various raw material, reagent, the instrument and equipment etc. used in the present invention can pass through city
Field is commercially available or can be prepared by existing method.
Embodiment 1：
The large-scale internal gear produced to certain company carries out the processing of carburizing and quenching, material 18CrNiMo, at this
After company has carried out conditioning treatment and roughing, surface clean is carried out to product first, after being cleaned to product, for production
The surface of product non-working surface carries out Anti-seeping technology.Carburizing process is carried out, as shown in Figure 1, equipment is added using pit carburizing furnace
Work is 920 ± 5 DEG C in carburizing temperature, first after being heated to temperature, keeps the temperature 40 minutes, keeps product bulk temperature uniform.Then
In 920 DEG C of ± 5 DEG C of progress Carburization Treatments, the time is set as 1200 minutes, and carbon potential needs are adjusted to 1.0 ± 0.05%, then same
Processing is diffused at a temperature of sample, the setting time is 800 minutes (time of carburizing and diffusion ratio is 3: 2), and carbon potential needs to adjust
To 0.7 ± 0.05%, temperature is reduced after terminating carburizing diffusion phase to 860 DEG C and keeps the temperature 60 minutes, is needed at this time straight at 860 DEG C
It is air-cooled to pick out stove.In carburizing and diffusion phase, whole process is passed through methanol and liquefied gas.
After client company has carried out vehicle carbon-coating and destressing tempering, quenching treatment is carried out to product, as shown in Fig. 2, first
First to 600 ± 5 DEG C of product soaking, 60 minutes are kept the temperature, this stage, then 820 ± 5 DEG C of soaking, kept the temperature 150 points by nitrogen protection
Clock, 840 ± 5 DEG C of last soaking keep the temperature 5 minutes, the two stage whole process are passed through methanol and liquefied gas, at 820 ± 5 DEG C and 840
Carbon potential is 0.7 ± 0.05% during ± 5 DEG C, quenches 60 DEG C of oil temperature, is kept for 30 minutes in oil, and oily high speed stirring.Most
After carry out secondary lonneal, 190 DEG C of temperature, time 360min；170 DEG C of temperature, time 240min.
The surface metallographic structure of the processed product of present invention process, as shown in Figure 3 and Figure 4.
Final detection result case hardness HRC61, hardened-depth 2.55mm, 4 grades of paralympic martensite, 2 grades of core ferrite,
1 grade of carbide is deformed after product heat and is met the requirements of the customers.
Claims (10)
1. a kind of heat treatment method carrying out carburizing and quenching to low-carbon alloy steel workpiece, which is characterized in that include the following steps：
(1) after being cleaned to workpiece surface, Anti-seeping technology is carried out to the surface of workpiece non-working surface；
(2) it is heated to after set temperature, heat preservation a period of time, Carburization Treatment and diffusion then is carried out to workpiece at such a temperature
Processing；
(3) then hardening heat is cooled to be kept the temperature；
(4) workpiece is directly come out of the stove air-cooled；
(5) workpiece is tempered into driving carbon-coating and destressing；
(6) quenching treatment is carried out to workpiece；
(7) by oil hardening under workpiece；
(8) secondary lonneal is finally carried out；
The step (2) neutralizes in the step (3), and whole process is passed through methanol and liquefied gas.
2. the heat treatment method according to claim 1 for carrying out carburizing and quenching to low-carbon alloy steel workpiece, which is characterized in that
In the step (2), the carbon potential of the Carburization Treatment is 1.0 ± 0.05%；The carbon potential of the DIFFUSION TREATMENT be 0.7 ±
0.05%.
3. the heat treatment method according to claim 1 for carrying out carburizing and quenching to low-carbon alloy steel workpiece, which is characterized in that
In the step (2), the carburizing and diffusion temperature are 920 ± 5 DEG C.
4. the heat treatment method according to claim 1 for carrying out carburizing and quenching to low-carbon alloy steel workpiece, which is characterized in that
In the step (2), the carburizing is 40 ± 5 minutes with the soaking time before DIFFUSION TREATMENT；The carburizing and DIFFUSION TREATMENT
Time ratio is 3: 2.
5. the heat treatment method of carburizing and quenching is carried out to low-carbon alloy steel workpiece according to claim 1-4 any one of them,
It is characterized in that, in the step (3), the hardening heat is 860 ± 5 DEG C, and quenching is kept for 60 ± 5 minutes.
6. the heat treatment method of carburizing and quenching is carried out to low-carbon alloy steel workpiece according to claim 1-4 any one of them,
It is characterized in that, the step (2) neutralizes in the step (3), and the flow that is passed through of methanol is 3.5 ± 0.5L/h.
7. the heat treatment method of carburizing and quenching is carried out to low-carbon alloy steel workpiece according to claim 1-4 any one of them,
It is characterized in that, in the step (6), the quenching treatment process, first 600 ± 5 DEG C of a soaking keep the temperature 60 ± 5 minutes, so
820 ± 5 DEG C of secondary soaking afterwards keep the temperature 150 ± 5 minutes, finally 840 ± 5 DEG C of soaking three times, keep the temperature 5 ± 1 minutes.
8. the heat treatment method according to claim 7 for carrying out carburizing and quenching to low-carbon alloy steel workpiece, which is characterized in that
It is described during 600 ± 5 DEG C of a soaking, by nitrogen protection；It is described 820 ± 5 DEG C of secondary soaking and three times soaking 840 ±
During 5 DEG C, whole process is passed through methanol and liquefied gas, and the flow that is passed through of methanol is 3.5 ± 0.5L/h；It is described in secondary soaking 820
± 5 DEG C and three times during 840 ± 5 DEG C of soaking, carbon potential is 0.7 ± 0.05%.
9. the heat treatment method of carburizing and quenching is carried out to low-carbon alloy steel workpiece according to claim 1-4 any one of them,
It is characterized in that, in the step (7), the quenching oil temperature is 60 ± 5 DEG C, and the retention time is 30 ± 5min in the oil.
10. the heat treatment method of carburizing and quenching is carried out to low-carbon alloy steel workpiece according to claim 1-4 any one of them,
It is characterized in that, in the step (8), the parameter of the secondary lonneal is respectively：190 ± 5 DEG C of temperature, the time 360 ±
5min；170 ± 5 DEG C of temperature, 240 ± 5min of time.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184561A (en) * | 2019-07-05 | 2019-08-30 | 晋江鹏发机械有限公司 | A kind of carburizing heat treatment process of alloy steel casting |
| CN110387521A (en) * | 2019-06-20 | 2019-10-29 | 苏州佳世捷机械有限公司 | A kind of carburizing heat treatment method that metal skin hardness is modified |
| CN110408882A (en) * | 2019-08-26 | 2019-11-05 | 山东亨格尔制造有限责任公司 | A kind of anti-carburizi ng processing method |
| CN110938794A (en) * | 2019-12-24 | 2020-03-31 | 南京宇能机械有限公司 | Output gear carburizing process and device for wind power generation |
| CN111549314A (en) * | 2020-05-21 | 2020-08-18 | 湖南特科能热处理有限公司 | Carburizing process for low-carbon steel thin-wall part |
| CN112795730A (en) * | 2020-12-24 | 2021-05-14 | 大冶特殊钢有限公司 | Heat treatment method for improving performance of drilling tool for down-the-hole drill |
| CN113481464A (en) * | 2021-06-22 | 2021-10-08 | 江苏力星通用钢球股份有限公司 | High-precision long-life rolling body heat treatment carburizing process |
| CN113913732A (en) * | 2021-09-23 | 2022-01-11 | 西安法士特汽车传动有限公司 | Preparation process of low-carbon alloy steel carburized part dispersion carbide |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110387521A (en) * | 2019-06-20 | 2019-10-29 | 苏州佳世捷机械有限公司 | A kind of carburizing heat treatment method that metal skin hardness is modified |
| CN110184561A (en) * | 2019-07-05 | 2019-08-30 | 晋江鹏发机械有限公司 | A kind of carburizing heat treatment process of alloy steel casting |
| CN110408882A (en) * | 2019-08-26 | 2019-11-05 | 山东亨格尔制造有限责任公司 | A kind of anti-carburizi ng processing method |
| CN110938794A (en) * | 2019-12-24 | 2020-03-31 | 南京宇能机械有限公司 | Output gear carburizing process and device for wind power generation |
| CN110938794B (en) * | 2019-12-24 | 2022-03-18 | 南京宇能机械有限公司 | Output gear carburizing process and device for wind power generation |
| CN111549314A (en) * | 2020-05-21 | 2020-08-18 | 湖南特科能热处理有限公司 | Carburizing process for low-carbon steel thin-wall part |
| CN112795730A (en) * | 2020-12-24 | 2021-05-14 | 大冶特殊钢有限公司 | Heat treatment method for improving performance of drilling tool for down-the-hole drill |
| CN112795730B (en) * | 2020-12-24 | 2022-09-16 | 大冶特殊钢有限公司 | Heat treatment method for improving performance of drilling tool for down-the-hole drill |
| CN113481464A (en) * | 2021-06-22 | 2021-10-08 | 江苏力星通用钢球股份有限公司 | High-precision long-life rolling body heat treatment carburizing process |
| CN113913732A (en) * | 2021-09-23 | 2022-01-11 | 西安法士特汽车传动有限公司 | Preparation process of low-carbon alloy steel carburized part dispersion carbide |
| CN113913732B (en) * | 2021-09-23 | 2024-02-06 | 西安法士特汽车传动有限公司 | Preparation process of low-carbon alloy steel carburized piece dispersed carbide |
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