CN106466766A - Nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process - Google Patents
Nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process Download PDFInfo
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- CN106466766A CN106466766A CN201610777742.4A CN201610777742A CN106466766A CN 106466766 A CN106466766 A CN 106466766A CN 201610777742 A CN201610777742 A CN 201610777742A CN 106466766 A CN106466766 A CN 106466766A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 239000003381 stabilizer Substances 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 105
- 238000007493 shaping process Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 239000002184 metal Substances 0.000 claims abstract description 14
- 238000007711 solidification Methods 0.000 claims abstract description 8
- 230000008023 solidification Effects 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims description 28
- 239000002671 adjuvant Substances 0.000 claims description 26
- 239000002893 slag Substances 0.000 claims description 8
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 5
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 5
- 238000010891 electric arc Methods 0.000 claims description 5
- 238000003754 machining Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000010962 carbon steel Substances 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims 1
- 239000006200 vaporizer Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 18
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- 238000005242 forging Methods 0.000 description 10
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- 229910001220 stainless steel Inorganic materials 0.000 description 4
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- 235000007164 Oryza sativa Nutrition 0.000 description 2
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- 229910045601 alloy Inorganic materials 0.000 description 2
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- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The present invention provides a kind of nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process, and the method is the high energy thermal source being composited using arc heat, resistance heat, electroslag heat, the raw metal silk material of fusing continuous conveying, and on base material, Layer by layer solidification stack shaping manufactures hardware；Using the relative movement of computer controls electric smelting head and base material, realize molten bath quick cooling Layer by layer solidification on base material and pile up, finally successively stack shaping manostat cylinder.Using the present invention have efficient, inexpensive, there are excellent mechanical performances.
Description
Technical field
The present invention relates to a kind of nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process.
Background technology
Manostat is one of nucleus equipment in one loop of nuclear power station system, is the crucial structure stablizing primary Ioops pressure and temperature
Part.With nuclear power working environment and ultimate attainment safety requirements, manostat equipment and materials preparation technology is required more and more high.
If lay-by material takes ASME standard SA508Gr3Cl2 or RCC-M standard 18MnD5 Hi-Stren steel (China
Corresponding standard 20MnMoNi), for ensureing material quality requirement, current manostat barrel components are welded all by original steel plate
It is changed to forging, and subsequent heat treatment and the final shaping of machining., whole manostat main part is divided into 5 taking AP1000 as a example
Material members, wherein cylinder part divide 3 partly additional upper low heads, the separately fabricated rear integral assembly welding of each several part.
Typical material stands Q-tempering heat treatment on the basis of forging（Also suffer once even above in the middle of typically
Normalizing and tempering heat treatment, in order to spread residual hydrogen, crystal grain thinning, is that finished heat treatment is prepared）, intensity can be obtained and toughness is comprehensive
Close the tempered martensite material structure of superior performance.The method is widely used aborning it is also possible to meet prescription, but
For the demand of the material components monomer being gradually increased, forging especially heat treatment when macroscopic material phase constitution easily occurs very not
Uniformly the problems such as.Complex process, chemistry and mechanical property control difficulty big, and it is poor to also result in quality stability, percent defective height.Simultaneously
Estimate in terms of result from the final crystal grain of this technique, general only about 5-7 level, in current development ＆ production desired pass through into
Step refining crystal grain has very big bottleneck improving the purpose of mechanical property especially intensity and toughness combination property, this technique.
In addition, manostat equipment using segmentation material forging and welding composition by the way of, isolated mechanical fiber
Continuous trend, the mechanical property of strong influence material and the safety of tankage.And also easily cause manufacturing schedule to drag
Prolong, increased cost.
Therefore, how to develop the fine grain needed for manostat, all organize, and the good material of comprehensive mechanical property
It is the difficult point and important development direction that the research and development of such new material need to be captured with integral forming method.
Content of the invention
In view of this, present invention is primarily targeted at, provide a kind of efficiently, low cost, there are excellent mechanical performances
Nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process.
For reaching above-mentioned purpose, the nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process of the present invention is using arc heat, resistance
The high energy thermal source that heat, electroslag heat are composited, the raw metal silk material of fusing continuous conveying, on base material, Layer by layer solidification is piled into
Shape manufactures hardware；
Electric smelting head and base material are connected to two poles, during shaping, raw metal silk material delivers to base material via conveying mechanism and electric smelting head
Surface, under the accumulation of graininess adjuvant is protected, produces electric arc between raw material silk material and base material, the deposited adjuvant of melt portions heap forms molten
Melt slag bath, electric current flows through raw material silk material and melting adjuvant slag bath forms resistance heat and electroslag heat, in arc heat, resistance heat, electroslag
So that raw material silk material is melted under hot three kinds of hot composite high-energy Sources, form local molten bath in substrate surface, continue transferring raw material
Silk material and adjuvant, according to the hierarchy slicing data of formed parts, using the relative movement of computer controls electric smelting head and base material, real
Existing molten bath quick cooling Layer by layer solidification on base material is piled up, finally successively stack shaping manostat cylinder.
In the present invention, required according to different nuclear power generating sets, the manostat barrel diameter 2-3 rice of shaping, length 3-12 rice.
In the present invention, shaping raw materials used silk material is for manostat component and the low-alloy steel material of special preparation, former
Material silk material diameter 2-8mm, C content 0.11-0.15%, workpiece C content 0.05-0.10% after shaping, workpiece grain size 9-10 level.
In the present invention, the electric current in power parameter is 200A～2000A, and voltage is 20V～50V, and power supply can be straight
Stream or alternating current power supply, when using DC source, electric smelting head can connect negative or positive electrode.
In the present invention, base material or deposit preheating is controlled to be 120 ~ 450 DEG C with interlayer temperature, electric smelting head and base material
Relative moving speed be 300～800mm/min, realize the rapid solidification in molten bath, thus obtain crystal grain fine and closely woven, no gross segregation,
The material of even tissue, greatly improves the mechanical properties such as plasticity, toughness and the high-temerature creep of Forming Workpiece.
In the present invention, during successively shaping, in lower metal surface formation molten bath, molten drop is with jet for raw material thread
Solidification after form enters molten bath makes double layer of metal form one, realizes layering and shapes, overall fusion is it is ensured that form metal component
Overall performance.
In the present invention, single electric smelting head is 20～50Kg/h to raw material silk material melting efficiency, in addition piles up effect for improving
Rate realizes quick shaping, and the quantity of electric smelting head can be adjusted to 1～100 on demand, when many electric smelting head is arranged, adjacent electric smelting
Head spacing is 50～500mm.
In the present invention, described base material can be cylindric or cylindric, and wall thickness is not less than 5mm.（Its axis）Level is joined
Put, realize successively piling up by the relative movement that the rotation and electric smelting head controlling base material is axially and radially gone up in base material.Base material
Can be 308 stainless steel materials or carbon steel or alloy steel material, when for 308 stainless steel material, can be used as foreign material
Connect synthesis workpiece, be can to remove in follow-up machining when carbon steel or alloy steel material.
The present invention has broken away from the constraint of the frock, mould and specific purpose tool of complexity；Shape and be near net-shaped blank, after production
Only need a small amount of polish, greatly simplify manufacturing procedure, shorten production life cycle；Workpiece formed thereby has the conventional forging process that matches in excellence or beauty
Mechanics and chemical property, intensity, toughness, the performance such as anti-corrosion are all very prominent；It is simultaneously achieved the monolithic molding of manostat cylinder,
Breach the limitation of conventional forging process technology, substantially increase efficiency, save cost.
Brief description
Fig. 1 is the schematic diagram for the electric smelting manufacturing process in specific embodiment is described；
Fig. 2 is the partial enlarged drawing near position shown in A in Fig. 1；
Fig. 3 is the schematic diagram for the manostat cylinder manufacturing process in embodiment is described.
Specific embodiment
With reference to the accompanying drawings the specific embodiment of the present invention is illustrated.Fig. 1 is for specific embodiment is described
In electric smelting manufacturing process schematic diagram；Fig. 2 is the partial enlarged drawing near position shown in A in Fig. 1.Due to being schematic diagram, because
And, in figure part is schematic, and its true form and size relationship are not limited by the illustration.
This manufacturing process be that raw material silk material 1 is melted and successively（It is the state being accumulated to during n-th layer shown in Fig. 2）Pile up
On basic material 2, thus ultimately forming required hardware.
Being embodied as operation is：
A. raw material silk material 1 is delivered to the surface of the base material 2 being positioned on workbench 21 by wire feeder 5, covers thereon by powder feeding machine
The graininess adjuvant of structure 4 conveying.
B. startup power supply 12, supply voltage makes to form electric arc 9 generation arc heat between raw material silk material 1 and base material 2, and arc heat makes
Partial supplementary material 3 melts, and forms adjuvant slag bath 8, and electric current flows through raw material silk material 1 via electric smelting 6 and forms resistance heat, and by melting
Slag bath 8 forms electroslag heat, and three kinds of thermals source are composited high energy thermal source, and melt raw material silk material, in base material 2 surface formation molten bath 11.
C. control electric smelting 6 and the relative movement of base material 2 and the temperature of base material 2, realize molten bath 11 and base material heat exchange solidification
Deposition.
D. wire feeder 5 and powder feeding mechanism 4 continue transferring raw material silk material 1 and adjuvant 3, cover molten bath 11 and base in adjuvant 3
In the state of material 2, raw material silk material 1 is successively deposited on base material 2, final Forming Workpiece.
Wherein, control device（Computer）According to Forming Workpiece（Numerical simulation, mathematical model）Hierarchy slicing data control
Electric smelting 6 processed and the relative movement mode of base material 2.
In present invention diagram, electric smelting tip electrode just connects, and workpiece connects to bear only makees signal effect it is also possible to electric smelting head connects negative, work
Part just connects, or takes alternating current power supply.
In the present invention, in order to ensure to form good high energy thermal source, especially for producing sufficient electroslag heat, permissible
The suitably parameter such as the composition of regulation adjuvant, the diameter of raw material silk material, relative moving speed of electric current, base material and raw material silk material.
In the present invention, the form of raw material thread 1 can be pole shape, banding, real core or medicated core；Raw material thread 1 straight
Footpath can be dimensioned so as to 2 ~ 8mm according to Forming Workpiece；Different according to silk material 1 diameter, stretch out the length of electric smelting head（Energising length
Degree）For 20mm～150mm.
In the present invention, adjuvant 3 cladding thickness is 15mm～120mm, and the effect using adjuvant 3 includes：Cover electric arc 9,
Prevent electric arc from splashing；Cover molten bath 11, completely cut off air, make molten pool metal from the infringement of in the air oxygen, nitrogen, hydrogen etc.；To molten bath
Metal forms insulation；Go the removal of impurity during metallurgical reaction, mix alloy；The slag bath 8 being formed（Skull 7）Mechanically protect
Deposited metal 10 well shapes etc..
The composition of adjuvant 3 comprises oxide or oxide and halogenide, because adjuvant 3 participates in melt tank reaction, adjusts work
Part（Hardware, product）Composition, thus the composition according to hardware to be formed and efficiency requirements, can be in adjuvant
Add alloy powder and/or elemental metals powder, reduce production cost.
In addition, in C operation, the behaviour that can incidentally reclaim remaining adjuvant and remove the skull 7 that slag bath 8 solidifies and formed
Make.During removal, machine can be started at the relative movement rear 400mm ~ 500mm of raw material thread 1 and remove or artificial removal's operation.
Using the electric smelting manufacturing process of present embodiment, raw material thread utilization rate is close to 100%；Compare existing process technology
（Forging, casting etc.）, manufacturing process is few（Do not need the heat treatment of complexity）, cycle is short, efficiency high, the machining of hardware
Surplus is very little, decreases the polish time simultaneously and has saved substantial amounts of material.
【Embodiment】
The description of this example melts, by Horizontal electric, the monolithic molding process that manufacturing process makes CAP1400 nuclear power manostat cylinder, passes
308 stainless steel layers of this cylinder inboard wall built-up welding thickness about 8mm, manostat cylinder wall thickness about 125mm in system technique, used sets
Standby inclusion：
（1）Revolving support platform；
（2）Electric smelting power supply；
（3）Electric smelting head；
（4）Automatic wire feeding device；
（5）Adjuvant automatic transport and adjuvant automatic recycling device；
（6）Heater；
（7）Chiller；
（8）Base material；
（9）Central control unit.
Fig. 3 be the electric smelting manufacturing process for representing the present embodiment schematically illustrate figure, in figure eliminates power supply, automatically
The devices such as wire feeder.Material power parameter is as follows：
1）Raw material silk material 101（C:0.12-0.14%, other elements are consistent with SA508-3）, diameter 4mm；
2）The adjuvant 301 of special development, composition is 29.5%CaO+MgO；30%AL2O3+MnO； 20.5%SiO2+TiO；20%
CaF2；
3）Electric smelting head quantity：39 electric smelting 601, electric smelting power supply is DC source, connects power cathode, base using electric smelting 601
Material 201 connects positive source；
4）Electric smelting technological parameter is：Electric smelting electric current 800A, electric smelting voltage 38V, electric smelting 601 and base material 201 relative moving speed
500～600mm/min（Molten bath translational speed）.
Annular metal member is made using hardware electric smelting manufacturing process, implementation step is as follows：
（1）By the axis horizontal configuration of columnar base material 201, and it is supported on revolving support platform, by 39 electric smelting heads with about
The spacing of 300mm（Central control unit determines exact position and movement）Average transverse is arranged in the top of base material 201, and adjusts
Each electric smelting head good and base material 201 surface（Outer peripheral face）Distance, and choose the starting point of electric smelting；
（2）Raw material silk material 101 and adjuvant are delivered to base material 201 surface, startup power supply, imports high energy thermal source, melt raw material silk material
And adjuvant, rotate base material 201 simultaneously, start first of each electric smelting head ground floor（Each layer is made up of the multiple tracks axially arranging）
Electric smelting deposition；
（3）After forming a segment distance between electric smelting 601 and electric smelting starting point, start startup adjuvant retracting device it is unfused
Adjuvant withdraw, expose skull and removed, in order to lower electric smelting deposition together（Pile up）；Subsequent start-up chiller or
Heater is cooled down to electric smelting deposited metal or is heated, by its matrix（Refer to base material 201 during ground floor, when other layer be
Refer to preceding layer deposit）Temperature control at 200～300 DEG C；
（4）When base material 201 rotation one circle completes first electric smelting deposition, under control of the control means, all electric smelting 201
Road width distance is melted in rectilinear movement 3/4 of simultaneously turning left, and adjusts the distance between surface of each electric smelting 601 and base material 201 simultaneously,
To ensure the stability of electric smelting, start the electric smelting deposition formation of ground floor second afterwards, will ensure during this to enclose around
Overlap good between road；
（5）After the completion of second, repeat step（4）Complete the shaping that other electric smelting deposit roads again, when reach last together
When, last one end point of its adjacent electric smelting head and first starting point will overlap well, so that the electric smelting completing ground floor is sunk
Long-pending；
（6）After the electric smelting completing ground floor deposits, all one layer of deposit thickness of electric smelting head automatic lifting（I.e. after layer）Height,
Start first electric smelting deposition of the second layer, the end point of ground floor electric smelting head is the starting point of first of the second layer, continuously
Deposition；
（7）After the completion of first electric smelting of second layer deposition, all electric smelting heads turn right the molten track pitch of rectilinear movement 3/4 from same simultaneously
When each electric smelting head adjust automatically its distance between with base material, to ensure the stability of electric smelting, start the electricity of second layer second
Molten deposition is so as to overlap good between the circle road of left and right；
（8）When complete the second layer second electric smelting deposition complete when, repeat step（7）, then complete other electric smelting deposition roads, when
When reaching last one, last one end point of its adjacent electric smelting head and first starting point will overlap well, down to completing the
Two layers of electric smelting deposition；
（9）Repeat step（6）To step（8）, then complete other electric smelting sedimentary, and during this, adjacent electric smelting sedimentary electric smelting
The moving direction of head can be contrary, final continuous electrofusion formation of deposits manostat cylinder.
After electric smelting shapes, stainless steel substrate 201 becomes a part for manostat cylinder it is achieved that foreign material directly connects
It is connected into shape, thus changing traditional handicraft after forging SA508-3 cylinder again in the stainless manufacturer of its inner wall overlaying 308
Formula, decreases technique process, improves work efficiency and quality it is also possible to ordinary carbon steel removes in follow-up machining.
According to conventional forging process, manostat cylinder is divided into 3 sections（Three sections of upper, middle and lower）, respectively forging again integral assembly welding and
Become, and the present embodiment is due to being multiple（39）Electric smelting monolithic molding arranged side by side, greatly improves forming efficiency；Natural
Electric smelting head quantity and arrangement, sectional forming can also be adjusted according to customer requirement.
Claims (8)
1. a kind of nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process it is characterised in that:
The method is the high energy thermal source being composited using arc heat, resistance heat, electroslag heat, the raw metal of fusing continuous conveying
Silk material, on base material, Layer by layer solidification stack shaping manufactures hardware；
Electric smelting head and base material are connected to two poles, during shaping, raw metal silk material delivers to base material via conveying mechanism and electric smelting head
Surface, under the accumulation of graininess adjuvant is protected, produces electric arc between raw material silk material and base material, the deposited adjuvant of melt portions heap forms molten
Melt slag bath, electric current flows through raw material silk material and melting adjuvant slag bath forms resistance heat and electroslag heat, in arc heat, resistance heat, electroslag
So that raw material silk material is melted under hot three kinds of hot composite high-energy Sources, form local molten bath in substrate surface, continue transferring raw material
Silk material and adjuvant, according to the hierarchy slicing data of formed parts, using the relative movement of computer controls electric smelting head and base material, real
Existing molten bath quick cooling Layer by layer solidification on base material is piled up, finally successively stack shaping manostat cylinder.
2. nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process according to claim 1 it is characterised in that：
Different, a diameter of 2-3m of evaporator tube of shaping, length 3-12m according to nuclear power generating sets type.
3. nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process according to claim 1 it is characterised in that：
Raw material silk material is according to 18MnD5 material standard in SA508Gr3Cl2 material standard in ASME or RCC-M or other corresponding marks
Quasi- preparation, silk material diameter 2-8mm, C content 0.11-0.15%, workpiece C content 0.05-0.10% after shaping, workpiece grain size 9-10
Level.
4. nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process according to claim 1 it is characterised in that：
Different according to silk material diameter, the electric current in power parameter is 200A～2000A, and voltage is 20V～50V, and power supply is direct current
Or alternating current power supply, when using DC source, electric smelting head connects negative or positive electrode.
5. nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process according to claim 1 it is characterised in that:
Required according to Forming Workpiece, base material or deposit are heated or cooled, control the table of base material or deposit layer
Face temperature is 120 ~ 450 DEG C.
6. nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process according to claim 1 it is characterised in that：
According to vaporizer formed parts size and efficiency requirements, the quantity set of electric smelting head is 1～100, and many electric smelting head is arranged
When, adjacent electric smelting head spacing is 50～500mm.
7. nuclear power plant voltage stabilizer cylinder electric smelting manufacturing process according to claim 1 it is characterised in that:
Described base material provides frock to support for Forming Workpiece, is shaped as cylindric or cylindric, and wall thickness is not less than 5mm.
8. substrate material can be 308 rustless steels or other ordinary carbon steel or steel alloy, when for 308 rustless steel, component shaping
Rear substrate is retained as a Forming Workpiece part, when for other ordinary carbon steels or steel alloy, can be in follow-up machining
Remove.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107584199A (en) * | 2017-09-27 | 2018-01-16 | 洛阳骄新材料科技有限公司 | One kind silk filling injection is integrally formed three-layer composite board material and preparation method thereof |
| CN108188542A (en) * | 2017-12-28 | 2018-06-22 | 南方增材科技有限公司 | Metal component filament electric smelting increasing material manufacturing method and metal component |
| CN111093875A (en) * | 2017-09-15 | 2020-05-01 | 株式会社神户制钢所 | Layered structure and method for manufacturing layered structure |
| CN112792433A (en) * | 2021-01-15 | 2021-05-14 | 南方增材科技有限公司 | Preparation method of high-toughness low-alloy steel member and high-toughness low-alloy steel member |
| EP3682996A4 (en) * | 2017-09-15 | 2021-06-16 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | LAMINATE MOLDING AND PROCESS FOR MANUFACTURING A LAMINATE MOLDING |
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| US11806820B2 (en) | 2017-09-15 | 2023-11-07 | Kobe Steel, Ltd. | Laminated molding and method of manufacturing laminated molding |
| CN107584199A (en) * | 2017-09-27 | 2018-01-16 | 洛阳骄新材料科技有限公司 | One kind silk filling injection is integrally formed three-layer composite board material and preparation method thereof |
| CN108188542A (en) * | 2017-12-28 | 2018-06-22 | 南方增材科技有限公司 | Metal component filament electric smelting increasing material manufacturing method and metal component |
| CN112792433A (en) * | 2021-01-15 | 2021-05-14 | 南方增材科技有限公司 | Preparation method of high-toughness low-alloy steel member and high-toughness low-alloy steel member |
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