CN110129653A - A kind of production method of soft 20CrMnTi round steel - Google Patents
A kind of production method of soft 20CrMnTi round steel Download PDFInfo
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- CN110129653A CN110129653A CN201910422595.2A CN201910422595A CN110129653A CN 110129653 A CN110129653 A CN 110129653A CN 201910422595 A CN201910422595 A CN 201910422595A CN 110129653 A CN110129653 A CN 110129653A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The embodiment of the present invention provides a kind of production method of soft 20CrMnTi round steel, it is characterized in that, include: design and control round steel blank ingredient be carbon: 0.18%~0.22%, silicon: 0.20%~0.30%, manganese: 0.85%~1.05%, chromium: 1.05%~1.25%, titanium: 0.050%~0.070%, aluminium: 0.020%~0.040%, oxygen≤0.0020%；Round steel blank is smelt molten steel by converter, molten steel through LF refining and RH application of vacuum, be casting continuously to form continuous casting billet；Continuous casting billet furnace use Three-section type heating, after heating through slightly, in, finish rolling Continuous mill train be rolled into after round steel；It rolls rear round steel and carries out control cooling by wearing hydrophone；It rolls after rear round steel wears water and enters cold bed progress natural cooling, round steel temperature on cooling table is controlled at 930 ± 30 DEG C.
Description
Technical field
The invention belongs to field of metallurgy, and in particular to a kind of production method of soft 20CrMnTi round steel.
Background technique
The industries such as China's automobile, engineering machinery flourish in recent years, the domestic demand ten to 20CrMnTi series round steel
Divide prosperity.By the statistics of China Association for Automobile Manufacturers and China Gear professional association, Chinese automobile volume of production and marketing will within 2019
Up to 28,000,000, about 3,700,000 t of the consumption of automobile gear steel or so, Chinese automobile yield is every year on average with 10% or so
Speed increases, and automobile industry product is constituted in recent years for analysis, it can be found that the fastest-rising mainly heavy duty truck of automobile industry
And car, with the quickening of cars ' entry into family paces, the auto industry in China has entered the high speed development stage, and gear of vehicle is got over
More to become the most important consumption user of gear-used steels.
Pinion steel is wider using covering surface, is mainly used in the manufacture of the gear of vehicle such as car, lorry, agricultural vehicle, motorcycle
It uses, in addition, engineering machinery gear use is also larger.The pinion steel main body steel grade that 20CrMnTi round steel is developed as China, should
Essential element Cr, Mn of steel grade are China rich in element, and cheap, production cost is low, and Grain growth trend is small, therefore the steel
Leading position of the kind in China's gear industry is difficult to shake for many years.
20CrMnTi belongs to low-carbon alloy steel, steel mechanical performance with higher, after carburizing and quenching lonneal, table
Surface hardness is HRC58-62, and core hardness is HRC 30~45.The processing performance of 20CrMnTi is preferable, is changed after forging with normalizing
It is apt to its machinability.In addition, 20CrMnTi also has preferable harden ability, due to the influence of alloying element titanium, not to overheat
Sensitivity, therefore the quenching that can directly cool down after carburizing, and carburizing speed is very fast, transition zone is more uniform, deforms after carburizing and quenching small.It is suitable
The important part for bearing to carry in high speed together in manufacture and impacting, rubbing, therefore 20CrMnTi is selected according to the operating condition of gear
Steel is proper.By 910-940 DEG C of carburizing, 870 DEG C of quenchings, the tensile strength of mechanical performance after 180-200 DEG C of tempering
>=1100Mpa, yield strength >=850Mpa, elongation percentage >=10%, the contraction percentage of area >=45%, impact flexibility >=680, hardness are
HRC 58-62。
20CrMnTi round steel is generally given birth to by standard GB/T/T3077-2015 structural alloy steel associated specifications
Delivery is produced, standard requirements 20CrMnTi round steel Brinell hardness when the state of supply of material is annealing or high tempering is not more than HB217,
But in actual production, consider process and cost factor, round steel is mostly the rolled production supply of material (close to normalizing state), that is, is rolled
Natural cooling is carried out by cold bed after the completion, without annealing or high tempering, the control of the tissue of round steel and hardness after rolling
Aspect means are very limited, and the 20CrMnTi round steel (generally≤Φ 50mm) of small dimension is since cold bed cooling velocity is fast, in steel
Bainite occurs or martensitic structure transformation, the hardness of round steel rise to H 240~H of B B300 from H 200~H of B B 220.
Use technique of the 20CrMnTi round steel at user is general are as follows: round steel → shearing or sawing → heating → punching press
→ heat treatment, the first procedure in user's use process be the blank size according to needed for different workpieces shear or sawing under
Material, therefore, for 20CrMnTi round steel with high hardness, the defects of when blanking will cause chipping (or " misrun "), such blanking
Part can not carry out it is subsequent stamping, to cause waste product, in addition, the round steel of high rigidity increases equipment loss.In short, hard
High 20CrMnTi round steel is spent because waste product increases, and equipment loss increases, processing efficiency is low, seriously affects user's use.
Since 20CrMnTi round steel development and production, the complaint for being connected to the higher aspect of user's hardness is most, and therefore produces
Raw more quality objections, by statistical analysis, hardness is more than blanking processing difficulties when will use family use after HB240, round steel
There are bainite or martensite to occur in tissue.
In realizing process of the present invention, it is found by the applicant that at least there are the following problems in the prior art:
For the situation that small dimension 20CrMnTi round steel hardness is higher, improvement is optimized to production technology, is such as being marked
The constituent contents such as C, Mn, Cr are reduced in quasi- range, are sent quickly through cold bed to storehouse after finish to gauge and are carried out the cold slow cooling of heap, but improve effect
Fruit is unsatisfactory.
Summary of the invention
The embodiment of the present invention provides a kind of production method of soft 20CrMnTi round steel, makes Φ 30~Φ 50mm specification
The control of 20CrMnTi round steel rolled hardness in HB200~HB230 range, make round steel have more good structural homogenity,
Lower hardness and good processing performance.
In order to achieve the above object, the embodiment of the present invention provides a kind of production method of soft 20CrMnTi round steel, design and
The ingredient for controlling round steel blank is carbon: 0.18%~0.22%, silicon: and 0.20%~0.30%, manganese: 0.85%~1.05%, chromium:
1.05%~1.25%, titanium: 0.050%~0.070%, aluminium: 0.020%~0.040%, oxygen≤0.0020%；
Round steel blank is smelt molten steel by converter, molten steel through LF refining and RH application of vacuum, be casting continuously to form continuous casting billet；
Continuous casting billet furnace use Three-section type heating, after heating through slightly, in, finish rolling Continuous mill train be rolled into after round steel；
It rolls rear round steel and carries out control cooling by wearing hydrophone；
It rolls after rear round steel wears water and enters cold bed progress natural cooling, round steel temperature on cooling table is controlled at 930 ± 30 DEG C.
Further, the continuous casting billet is square billet, having a size of 165 × 165mm.
Further, the continuous casting is carried out using electromagnetic agitation.
Further, the continuous casting billet uses Three-section type heating in furnace, and heating time is 60~90min.
Further, the continuous casting billet uses Three-section type heating in furnace, and soaking section temperature is 1150 ± 40 DEG C, open rolling temperature
Degree is 1055 ± 25 DEG C.
Further, after the heating through it is thick, in, finish rolling Continuous mill train rolled, mill speed is 4~7m/s.
Further, the hydrophone of wearing is venturi tube structure.
Further, the hydrophone hydraulic pressure of wearing is 1.30~1.55MPa.
Further, the hydrophone arrangement of wearing is that tri- kinds of length of 2.2m, 3.3m, 5.5m wear hydrophone independent assortment.
Further, the cold bed inlet temperature is 930 ± 30 DEG C.
Above-mentioned technical proposal have the following beneficial effects: using worn after rolling hydrophone carry out high temperature section (about 700 DEG C~1000
DEG C) roll after control cooling, so that round steel is entered ferrite, pearlitic transformation humidity province for the first time in Water cooling, wear after water with
Round steel center portion Decay heat removal rise again, second enter ferrite, pearlitic transformation humidity province on cold bed, to increase iron
Ferritic, pearlitic transformation time, ferrite, perlitic transformation ratio more thoroughly, control cold obtained fine grained texture and accelerate ferrite
Formation, inhibit retained austenite to bainite and martensite transfor mation, round steel tissue is mainly F+P, round steel rolled hardness
It can control in HB230 hereinafter, other performance is unaffected simultaneously, the stretching of round steel, impact, Hypoploidy are able to satisfy GBT3077-
The requirement of 2015 standards, the production suitable for the rolled soft 20CrMnTi round steel by GBT3077-2015 standard requirements.
Specific embodiment
The following is a clear and complete description of the technical scheme in the embodiments of the invention, it is clear that described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
Art personnel every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Inventive principle: traditional view thinks that steel alloy rolled hardness control method mainly has cold bed temperature control slow cooling at present
(using insulation cover etc.), or quickly the methods of logical cold bed high temperature collection, stacking slow cooling.Water cooling technique is mainly used at present
The reinforcing bar of straight carbon steel produces, but is also for improving hardness and strength.If Water cooling produced applied to steel alloy, can mention
High-alloy steel rolled hardness, therefore, common knowledge thinks: cooling control after rolling can only generally increase intensity and improve hardness rather than phase
Instead.
But applicant is in production through overtesting and research discovery: the high temperature section (about 700 DEG C~1000 of rolled piece after rolling
DEG C) using under the conditions of suitably wearing water intensity, pressure and suitable temperature on cooling table, Water cooling technique can be applied to control
Alloyage steel rolled hardness.Under the conditions of suitably wearing water intensity, pressure and suitable temperature on cooling table, water cooling is worn after rolling
But crystal grain can be refined, fine grain can promote ferrite transformation, it is suppressed that the formation of bainite, to reduce the heat of steel alloy
Roll state hardness.
Under the guidance of above-mentioned principle, applicant overcomes traditional technology prejudice, provides a kind of rolled soft
The production method of 20CrMnTi round steel, comprising: the ingredient of design and control round steel blank is carbon: 0.18%~0.22%, silicon:
0.20%~0.30%, manganese: 0.85%~1.05%, chromium: 1.05%~1.25%, titanium: 0.050%~0.070%, aluminium:
0.020%~0.040%, oxygen≤0.0020%, by determining the chemical component of round steel, the accurate content for controlling harmful element and
Guarantee the content for being beneficial to the element of round steel performance；
Round steel blank is smelt molten steel by converter, molten steel through LF refining and RH application of vacuum, be casting continuously to form continuous casting billet, by round steel
Blank casts continuous casting billet by this series of steps, prepares for post-processing；
Continuous casting billet furnace use Three-section type heating, after heating through slightly, in, finish rolling Continuous mill train be rolled into after round steel；In advance
Hot arc: eliminating stress hidden danger, and into preferable plastic zone, Crack prevention is generated, and exhaust gas temperature can be made to reduce, and saves fuel；
Bringing-up section: can strengthen quick heating, allow to have the biggish temperature difference, improve the production efficiency of stove；Soaking zone: temperature relatively heats
Section is low, and only central temperature is improved, and reduces the temperature difference at surface and center, makes homogeneous heating, removes a hidden danger for rolling；
It rolls rear round steel and carries out control cooling by wearing hydrophone, crystal grain can be refined by rolling rear Water cooling, and fine grain can promote
Into ferrite transformation, inhibit the formation of bainite, to reduce the rolled hardness of steel alloy；
It rolls rear round steel and wears and enter cold bed after water and carry out natural cooling, the control of round steel temperature on cooling table is at 930 ± 30 DEG C, cold bed
Designing quality and installation accuracy and temperature control directly decide the final mass of product.
Further, the continuous casting billet be square billet, having a size of 165 × 165mm, section is wide, height is equal or difference not
Greatly, it is mainly used to rolled section steel, wire rod.
Further, the continuous casting is carried out using electromagnetic agitation, the electromagnetic force that electromagnetic agitation is generated by electromagnetic induction
So that liquid metal is generated flowing, increases its convection current and heat exchange, the temperature gradient of solidification front is caused to reduce；Column growth by
To inhibition, and the column crystal grown in advance can be made broken, be mixed with molten steel, become the core of later period isometric crystal solidification,
To promote the growth of equiax crystal；Electromagnetic agitation, which can increase isometric crystalline region, to be improved the mechanical performance of slab and reduces nonmetal inclusion
The surface of the subcutaneous aggregation improvement slab of object and subcutaneous quality.
Further, the continuous casting billet uses Three-section type heating in furnace, and heating time is 60~90min, when suitable
Between section can make round steel have preferable plasticity, avoid cracking, improve round steel performance.
Further, the continuous casting billet uses Three-section type heating in furnace, and soaking section temperature is 1150 ± 40 DEG C, open rolling temperature
Degree is 1055 ± 25 DEG C.
Further, after the heating through it is thick, in, finish rolling Continuous mill train rolled, mill speed is 4~7m/s,
To realize preferable cooling effect.
Further, the hydrophone of wearing is venturi tube structure.
Further, the hydrophone hydraulic pressure of wearing is 1.30~1.55MPa, in this way, being conducive to roll rear Water cooling refinement
Crystal grain.
Further, the hydrophone arrangement of wearing is that tri- kinds of length of 2.2m, 3.3m, 5.5m wear hydrophone independent assortment.
Further, the cold bed inlet temperature is 930 ± 30 DEG C, controls temperature on cooling table refinement by Water cooling
Crystal grain.
The finished product produced is sampled: 3~5 sample blanks of interception on every batch of round steel difference root, sample blanks length 600mm, often
A sample blanks be processed into stretching, impact, hardness, low power and microscopic structure detection project sample.
Sample processing: sample blanks presses GB/T228.1, GB/T229, GB/T231.1, GB/T226, GB/T13298, GB/ respectively
T13299 standard is stretched, is impacted, hardness, low power and microscopic structure examine the sample processing of project and is detected, each detection
Mesh every batch of sample quantities are as follows: stretching 2, impact 1 group 2, hardness 3, low power 2, microscopic structure 2, same detection project
Sample in the sample blanks of different round steel intercept processing.
Tensile sample is quenched by the heat treating regime of GBT 3077-2015 standard recommendation, is existed again after tempering heat treatment
It completes to stretch item detection on cupping machine, impact test detection is completed on shock machine, is seen under an optical microscope
Examine entire microscopic structure sample total cross-section tissue and grain size.Round steel Brinell hardness detection is carried out with Brinell hardness tester.
In Liu Gang by being applied in the Φ 30mm specification of GBT 3077-2015 standard production, 20CrMnTi round steel, specifically
Step are as follows:
1) blank smelting Composition Control: carbon: 0.22%, silicon: 0.25%, manganese: 0.99%, chromium: 1.18%, titanium:
0.060%, aluminium: 0.028%, oxygen≤0.0018%；
2) steel billet is in stove heating time 78min, and using Three-section type heating, soaking section temperature is opened by 1150 ± 40 DEG C of controls
1060 DEG C of temperature are rolled, finished frame mill speed is controlled in 7m/s；
3) it rolls rear round steel and carries out control cooling by wearing hydrophone.Wear hydrophone hydraulic pressure 1.38MPa, the control of round steel temperature on cooling table
At 930 DEG C；
4) natural cooling is carried out on round steel after cold bed；
5) it makes steel and rolls according to above-mentioned process parameter control, finished product round steel metallographic microstructure is F+P, and section Bu Shi is hard
Degree is HB207~218 (mean value HB213), and the other performance such as stretching of round steel, impact, Hypoploidy are able to satisfy GBT 3077-2015
The requirement of standard.
Liu Gang in the Φ 42mm specification of GBT 3077-2015 standard production, 20CrMnTi round steel by being applied, specifically
Step are as follows:
1) blank smelting Composition Control: carbon: 0.20%, silicon: 0.26%, manganese: 0.96%, chromium: 1.15%, titanium:
0.062%, aluminium: 0.032%, oxygen≤0.0016%；
2) steel billet is in stove heating time 82min, and using Three-section type heating, soaking section temperature is opened by 1150 ± 40 DEG C of controls
1050 DEG C of temperature are rolled, finished frame mill speed is controlled in 5m/s；
3) it rolls rear round steel and carries out control cooling by wearing hydrophone.Wear hydrophone hydraulic pressure 1.38MPa, the control of round steel temperature on cooling table
At 950 DEG C；
4) natural cooling is carried out on round steel after cold bed；
5) it makes steel and rolls according to above-mentioned process parameter control, finished product round steel metallographic microstructure is F+P, and section Bu Shi is hard
Degree is HB203~215 (mean value HB210), and the other performance such as stretching of round steel, impact, Hypoploidy are able to satisfy GBT 3077-2015
The requirement of standard.
For can be realized any technical staff in the art or using the present invention, above to disclosed embodiment into
Description is gone.To those skilled in the art；The various modifications mode of these embodiments will be apparent from, and this
The General Principle of text definition can also be suitable for other embodiments on the basis of not departing from the spirit and scope of the disclosure.
Therefore, the disclosure is not limited to embodiments set forth herein, but most wide with principle disclosed in the present application and novel features
Range is consistent.
Claims (10)
1. a kind of production method of soft 20CrMnTi round steel characterized by comprising
The ingredient of design and control round steel blank is carbon: 0.18%~0.22%, silicon: and 0.20%~0.30%, manganese: 0.85%~
1.05%, chromium: 1.05%~1.25%, titanium: 0.050%~0.070%, aluminium: 0.020%~0.040%, oxygen≤
0.0020%；
Round steel blank is smelt molten steel by converter, molten steel through LF refining and RH application of vacuum, be casting continuously to form continuous casting billet；
Continuous casting billet furnace use Three-section type heating, after heating through slightly, in, finish rolling Continuous mill train be rolled into after round steel；
It rolls rear round steel and carries out control cooling by wearing hydrophone；
It rolls after rear round steel wears water and enters cold bed progress natural cooling.
2. a kind of production method of soft 20CrMnTi round steel according to claim 1, it is characterised in that:
The continuous casting billet is square billet, having a size of 165 × 165mm.
3. a kind of production method of soft 20CrMnTi round steel according to claim 1, it is characterised in that:
The continuous casting is carried out using electromagnetic agitation.
4. a kind of production method of soft 20CrMnTi round steel according to claim 1, it is characterised in that:
The continuous casting billet uses Three-section type heating in furnace, and heating time is 60~90min.
5. a kind of production method of soft 20CrMnTi round steel according to claim 1, it is characterised in that:
The continuous casting billet uses Three-section type heating in furnace, and soaking section temperature is 1150 ± 40 DEG C, and start rolling temperature is 1055 ± 25
℃。
6. a kind of production method of soft 20CrMnTi round steel according to claim 1, it is characterised in that:
After the heating through it is thick, in, finish rolling Continuous mill train rolled, mill speed is 4~7m/s.
7. a kind of production method of soft 20CrMnTi round steel according to claim 1, it is characterised in that:
The hydrophone of wearing is venturi tube structure.
8. a kind of production method of soft 20CrMnTi round steel according to claim 1, it is characterised in that:
The hydrophone hydraulic pressure of wearing is 1.30~1.55MPa.
9. a kind of production method of soft 20CrMnTi round steel according to claim 1, it is characterised in that:
The hydrophone arrangement of wearing is that tri- kinds of length of 2.2m, 3.3m, 5.5m wear hydrophone independent assortment.
10. a kind of production method of soft 20CrMnTi round steel according to claim 1, it is characterised in that:
The cold bed inlet temperature is 930 ± 30 DEG C.
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| CN202011266600.4A CN112553538B (en) | 2019-05-21 | 2019-05-21 | Low-hardness 20CrMnTi round steel |
| CN201910422595.2A CN110129653B (en) | 2019-05-21 | 2019-05-21 | Production method of low-hardness 20CrMnTi round steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112570451A (en) * | 2020-11-26 | 2021-03-30 | 宝钢特钢韶关有限公司 | 20CrMnTi steel and production method thereof |
| CN112792125A (en) * | 2020-12-17 | 2021-05-14 | 江苏永钢集团有限公司 | Controlled rolling process for solving lateral bending of 20CrMnTiH |
| CN112808773A (en) * | 2020-12-04 | 2021-05-18 | 大冶特殊钢有限公司 | Rolling method for controlling low-carbon Mn-Cr type gear steel structure |
| CN113680984A (en) * | 2020-05-18 | 2021-11-23 | 宝山钢铁股份有限公司 | Casting blank bending control method for bainite phase change steel generated in small square billet air cooling process |
| CN113843285A (en) * | 2021-08-30 | 2021-12-28 | 南京钢铁股份有限公司 | Rolling method for reducing hot rolling hardness and bending degree of 20CrMnTi |
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| CN114231698B (en) * | 2021-11-16 | 2022-08-26 | 北京科技大学 | RH refining process for inhibiting 20CrMnTi steel from generating large-size TiN-containing composite inclusions |
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| CN113680984A (en) * | 2020-05-18 | 2021-11-23 | 宝山钢铁股份有限公司 | Casting blank bending control method for bainite phase change steel generated in small square billet air cooling process |
| CN113680984B (en) * | 2020-05-18 | 2022-12-16 | 宝山钢铁股份有限公司 | Casting blank bending control method for bainite phase change steel generated in small square billet air cooling process |
| CN112570451A (en) * | 2020-11-26 | 2021-03-30 | 宝钢特钢韶关有限公司 | 20CrMnTi steel and production method thereof |
| CN112808773A (en) * | 2020-12-04 | 2021-05-18 | 大冶特殊钢有限公司 | Rolling method for controlling low-carbon Mn-Cr type gear steel structure |
| CN112808773B (en) * | 2020-12-04 | 2022-09-02 | 大冶特殊钢有限公司 | Rolling method for controlling structure of low-carbon Mn-Cr type gear steel |
| CN112792125A (en) * | 2020-12-17 | 2021-05-14 | 江苏永钢集团有限公司 | Controlled rolling process for solving lateral bending of 20CrMnTiH |
| CN113843285A (en) * | 2021-08-30 | 2021-12-28 | 南京钢铁股份有限公司 | Rolling method for reducing hot rolling hardness and bending degree of 20CrMnTi |
Also Published As
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|---|---|
| CN112553538B (en) | 2021-10-29 |
| CN110129653B (en) | 2020-12-01 |
| CN112553538A (en) | 2021-03-26 |
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