CN106001825B - Anticorrosion superalloy pipe tube sheet connection method and heat exchanger - Google Patents
Anticorrosion superalloy pipe tube sheet connection method and heat exchanger Download PDFInfo
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- CN106001825B CN106001825B CN201610532317.9A CN201610532317A CN106001825B CN 106001825 B CN106001825 B CN 106001825B CN 201610532317 A CN201610532317 A CN 201610532317A CN 106001825 B CN106001825 B CN 106001825B
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- Prior art keywords
- tube
- pipe
- tube sheet
- pore
- shaped ring
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/027—Making tubes with soldering or welding
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
-
- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3013—Au as the principal constituent
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/14—Heat exchangers
Abstract
The invention discloses a kind of anticorrosion superalloy pipe tube sheet connection method.This method includes：1st, pore is processed on tube sheet, around U-shaped ring-type feeding groove of the machining of drilling for placing solder ring on the upside of tube sheet, the internal diameter of U-shaped ring-type feeding groove is not less than tube outer diameter+1mm, and sets the U-shaped ring-type feeding groove of connection and pore and along the circumferentially equally distributed multiple feed holes of pore；2nd, through pore and cause pipe lower end to protrude tube sheet underside plan on pipe, tube expansion then is carried out to pipe lower end protruding portion, pipe lower end protruding portion is finally pressed into pore；3rd, fusion welds are carried out to junction on the downside of pipe lower end and tube sheet, weld penetration is not less than the wall thickness of pipe；4th, vacuum brazing is carried out after solder ring being inserted in U-shaped ring-type feeding groove.The invention also discloses a kind of anticorrosion superalloy heat exchanger.Present invention can ensure that the metallurgical binding of through thickness is formed between tube-to-tube sheet connection.
Description
Technical field
The present invention relates to tube-plate connection method, more particularly to a kind of anticorrosion superalloy tube-plate connection method.
Background technology
Forth generation nuclear reactor-MSR becomes following nuclear power neck because it has the advantages that inherent safety and efficient
The important development direction in domain.The reactor operating temperature is 600 DEG C ~ 700 DEG C, using the strong fused salt of corrosivity as cooling agent,
With the nickel base superalloy of anti-fused salt corrosion（Such as Hastelloy N alloys or the section of China of U.S.'s Oak Ridge development in laboratory
Grind the GH3535 alloys of unit exploitation）As structural material, build nuclear reactor and be necessary to ensure that the nuclear equipment for producing high quality,
And nucleus equipment of the fused salt heat exchanging device as reactor, its reliability manufactured, especially the connection of heat exchanger tube-plate is reliable
Property is particularly important.
The connection method of traditional Tube Sheet of Heat Exchanger-tube sheet joint mainly has three kinds：（1）Tube sheet end and the tungsten electrode argon of pipe
Arc-welding, the welding manner only obtain the weld seam of certain fusion penetration, the gap between larger tube-to-tube sheet connection, the presence in the gap be present
Cause the root of weld big stress concentration to be present and the danger of crevice corrosion be present, harsh severe Service Environment down tube-
Tube sheet joint easily fails；（2）The expanded joint weldering of tube-to-tube sheet connection, i.e., the mode of expanded joint+welding, the welding manner are applied to
In the evaporator of presurized water reactor of the running temperature less than less than 350 DEG C, but expanded joint belongs to mechanical bond rather than metallurgical binding, higher
At a temperature of material phenomena such as creep relaxation can occur, therefore expanded joint position is easily got loose, so cause weld stress to be concentrated and
Failure；（3）Tube-to-tube sheet connection endoporus welding technology, the welding manner need equipped with special welding gun deeply manage in welded, by
In MSR heat exchanger heat-exchanging tube internal diameter only about 10mm, there has been no the weldering that the welding gun of maturation can be used for internal bore welding in the market
Connect.
Therefore, the operating mode of the material property for anticorrosion superalloy and high temperature high corrosion, how to provide a kind of pipe-
The connection method of tube sheet, avoid joint stress concentration ftracture and crevice corrosion danger, improve heat exchanger service life and
Security is that those skilled in the art need to solve the problems, such as.
The content of the invention
The technical problems to be solved by the invention are to overcome prior art insufficient, there is provided a kind of anticorrosion superalloy
Tube-plate connection method, it can be ensured that the metallurgical binding of through thickness is formed between tube-to-tube sheet connection, avoids joint stress concentration from opening
Split, prevent crevice corrosion, so as to improve the service life and security of equipment as similar MSR heat exchanger.
Anticorrosion superalloy tube-plate connection method proposed by the invention, comprises the following steps：
Step 1, the pore for processing on tube sheet diameter 0.08~0.16mm bigger than tube outer diameter, are surrounded on the upside of tube sheet
The machining of drilling is used for the U-shaped ring-type feeding groove for placing solder ring, and the internal diameter of U-shaped ring-type feeding groove is not less than outside pipe
Footpath+1mm, and the U-shaped ring-type feeding groove of connection and pore are set and along the circumferentially equally distributed multiple feed holes of pore；
Step 2, pipe is passed through into pore and causes pipe lower end to protrude tube sheet underside plan, then pipe lower end is protruded
The part of tube sheet underside plan carries out tube expansion so that tube outer diameter maximum is bigger 0.5mm than pore diameter after tube expansion, finally will pipe
Sub- lower end is pressed into pore, until concordant with tube sheet underside plan；
Step 3, fusion welds are carried out to junction on the downside of pipe lower end and tube sheet, weld penetration is not less than the wall of pipe
It is thick；
Step 4, carry out vacuum brazing after inserting solder ring in the U-shaped ring-type feeding groove.
Preferably, the material of the solder ring is golden nickel alloy；Preferable quality proportioning is 82%Au and 18%Ni.
Preferably, the technological parameter of the vacuum brazing is specific as follows：The vacuum 10 of vacuum brazing-2It is more than pa, heating
Speed is not more than 10 DEG C/min, 900 DEG C of insulation 20min of pilot process, 1000~1020 DEG C of brazing temperature, and soaking time 20~
60min, come out of the stove after being down to less than 400 DEG C of temperature with the rate of temperature fall no more than 5 DEG C/min.
Preferably, into 30 ° of angles between the axis and tube bore axis of the feed hole.
Preferably, the portion of tube sheet underside plan is protruded pipe lower end using the hard alloy pressure head of 30 ° of taper in step 2
Divide and carry out hydraulic expanding tube, pipe lower end is then pressed into pore using hydraulic press.
Further, the U-shaped ring for reducing fusion welds stress is pre-machined around the pore on the downside of tube sheet
Groove, the internal diameter of the U-shaped ring groove are not less than+2 times of pipe wall thickness of tube outer diameter, and U-shaped ring groove width is not less than pipe wall thickness,
U-shaped ring groove depth is not less than pipe wall thickness.The welding stress of fusion welds can be effectively reduced using the program.
The anticorrosion superalloy can be all kinds of anticorrosion superalloys that are existing or will having, such as Hastelloy
N alloys or GH3535 alloys.Tube sheet can be with identical with anticorrosion superalloy material used in pipe, can also be different.
A kind of anticorrosion superalloy heat exchanger can also be obtained according to identical invention thinking, including be connected with tube sheet
One group of pipe, the tube sheet are connected with pipe by connection method described in any of the above-described technical scheme.
Compared with prior art, the invention has the advantages that：
The metallurgical connection of through thickness of the anticorrosion superalloy tube sheet and pipe of big thickness, tube plate thickness can be achieved in the present invention
Up to 130mm, this is that prior art is unable to reach；
The tube-plate joint of the inventive method connection avoids the danger of stress concentration cracking and crevice corrosion, effectively carries
High MSR heat exchanger etc. uses the service life and security of equipment under high temperature high corrosion environment.
Brief description of the drawings
Fig. 1 is the schematic diagram of one preferred embodiment of the inventive method；Wherein, 1 is tube sheet, and 2 be pore, and 3 be pipe, 4
It is the U-shaped ring-type feeding groove on the upside of tube sheet for the U-shaped ring groove on the downside of tube sheet, 5,6 be feed hole, and 7 be with managing on the downside of tube sheet
The argon-arc welding seam of sub- junction, 8 be soldered seam.
Embodiment
Technical scheme is described in detail below in conjunction with the accompanying drawings：
The anticorrosion superalloy tube-plate that the present invention is difficult to complete for prior art is reliably connected problem, proposes
A kind of new connection method, the techniques such as expanded joint, melting welding, soldering are organically combined, it is achieved thereby that pipe of the thickness up to 130mm
The through thickness of plate and pipe connects, and tube-plate joint avoids the danger of stress concentration cracking and crevice corrosion, switching performance
Fully meet the safe operation requirement that MSR heat exchanger etc. uses equipment under high temperature high corrosion environment.The technology of the present invention side
Case is specific as follows：
Step 1, the pore for processing on tube sheet diameter 0.08~0.16mm bigger than tube outer diameter, are surrounded on the upside of tube sheet
The machining of drilling is used for the U-shaped ring-type feeding groove for placing solder ring, and the internal diameter of U-shaped ring-type feeding groove is not less than outside pipe
Footpath+1mm, and the U-shaped ring-type feeding groove of connection and pore are set and along the circumferentially equally distributed multiple feed holes of pore；
Step 2, pipe is passed through into pore and causes pipe lower end to protrude tube sheet underside plan, then pipe lower end is protruded
The part of tube sheet underside plan carries out tube expansion so that tube outer diameter maximum is bigger 0.5mm than pore diameter after tube expansion, finally will pipe
Sub- lower end is pressed into pore, until concordant with tube sheet underside plan；
Step 3, fusion welds are carried out to junction on the downside of pipe lower end and tube sheet, weld penetration is not less than the wall of pipe
It is thick；
Step 4, carry out vacuum brazing after inserting solder ring in the U-shaped ring-type feeding groove.
For the ease of public understanding, technical solution of the present invention is described in detail with a preferred embodiment below.
So that the tube sheet of MSR heat exchanger connects with pipe as an example, tube sheet and pipe institute are the present embodiment using material
GH3535 alloys, the thickness of heat exchanger tube sheet reach 130mm, tube outer diameter 13.72mm；Tube sheet and pipe in the present embodiment
Connection procedure is as shown in figure 1, specific as follows：
The processing of step 1, tube sheet：Diameter 0.08~0.16mm bigger than tube outer diameter pore is processed on tube sheet,
Around U-shaped ring-type feeding groove of the machining of drilling for placing solder ring, the internal diameter of U-shaped ring-type feeding groove on the upside of tube sheet
Not less than tube outer diameter+1mm, and the U-shaped ring-type feeding groove of connection and pore and circumferentially equally distributed multiple along pore are set
Feed hole；
In the present embodiment, as shown in figure 1, processing pore 2, the diameter 13.80mm of pore 2 first on 130mm thickness tube sheet 1；
The upside of tube sheet 1 processes the U-shaped ring-type feeding groove 5 for placing solder ring around pore 2, and the specific size of groove is according to soldering
Depending on required solder, the internal diameter of the present embodiment further groove 5 is 16mm, width 2.5mm, depth 2.5mm；It is circumferential along pore 2
Every 120 ° of processing, one U-shaped ring-type feeding groove 5 of connection and pore 2 and with tube bore axis into 30 ° of feed hole 6, the present embodiment
In each feed hole 6 a diameter of 2.3mm.
The present invention can also be answered further on the downside of tube sheet around the U-shaped ring groove of the machining of drilling with reducing the welding of argon arc welding
Power, the internal diameter of the U-shaped ring groove are not less than+2 times of pipe wall thickness of tube outer diameter, and U-shaped ring groove width is not less than pipe wall thickness, U
Type ring depth of groove is not less than pipe wall thickness；As shown in figure 1, the internal diameter of U-shaped ring groove 4 is 17.12mm in the present embodiment, width
For 1.8mm, depth 2.3mm.
Step 2, pipe is passed through into pore and causes pipe lower end to protrude tube sheet underside plan, then pipe lower end is protruded
The part of tube sheet underside plan carries out tube expansion so that tube outer diameter maximum is bigger 0.5mm than pore diameter after tube expansion, finally will pipe
Sub- lower end is pressed into pore, until concordant with tube sheet underside plan；
First through pore 2 and the lower end of pipe 3 is caused to protrude from the underside plan of tube sheet 1 on pipe 3, then to the lower end of pipe 3
The part of the prominent underside plan of tube sheet 2 carries out tube expansion.In the present embodiment pipe 3 and tube sheet are cleaned up with detergent and acetone etc.
1, the part that the underside plan of tube sheet 2 is protruded the lower end of pipe 3 using 30 ° of hard alloy pressure head of taper carries out hydraulic expanding tube, swollen
Pipe pressure about 15KN so that bigger 0.5mm than the diameter of pore 2 at the largest outside diameter of pipe 3 after tube expansion；Then will be swollen using hydraulic press
The lower end protruding portion press-in pore 2 of pipe 3 after pipe, until the lower end of pipe 3 is concordant with the underside plan of tube sheet 1；During hydraulic pressure
Ensure that pipe 3 and pore 2 are concentric as far as possible, to ensure the reasonable clearance of soldering.
Step 3, end fusion welds：Fusion welds are carried out to junction on the downside of pipe lower end and tube sheet, weld penetration is not
Less than the wall thickness of pipe；
The fusion welds modes such as argon arc welding, plasma arc welding (PAW), Laser Welding can be used to being combined on the downside of pipe lower end and tube sheet
Place is welded, and uses argon tungsten-arc welding in the present embodiment, and its technological parameter is specific as follows：It is passed through the height that flow is 15L/min
Straight argon protects gas, electrode to workpiece distance 1mm, welding current 45A, speed of welding 10mm/s.As shown in figure 1, resulting argon
The fusion penetration of arc weld 7 is slightly larger than the wall thickness of pipe 3.Be pre-set at the U-shaped ring groove 4 of the downside of tube sheet 1 can effectively eliminate it is molten
The welding stress of welding.
The vacuum brazing of step 4, tube-to-tube sheet connection：Carried out very after solder ring is inserted in the U-shaped ring-type feeding groove
Empty soldering；
Material property for anticorrosion superalloy and and its special use environment, present invention preferably employs golden nickel
Solder alloy carries out vacuum brazing to tube-to-tube sheet connection, wherein, the preferred mass proportioning of golden nickel alloy solder is 82%Au and 18%
Ni.Specifically, tungsten argon arc postwelding is completed, 82Au-18Ni solder is put into the U-shaped ring-type feeding groove 5 on the upside of tube sheet
Ring, tube sheet and pipe are integrally then put into vacuum brazing furnace and carry out vacuum brazing, the technological parameter of vacuum brazing：Vacuum
10-2More than pa, programming rate is not more than 10 DEG C/min, 900 DEG C of insulation 20min of pilot process, 1020 DEG C of brazing temperature, during insulation
Between 60min, come out of the stove after being down to less than 400 DEG C of temperature with the rate of temperature fall no more than 5 DEG C/min.In brazing process, 82Au-
18Ni solder is changed into liquid, by feed hole 6 be packed into gap between tube sheet 1 and pipe 3 and with tube sheet 1 and pipe 3
GH3535 alloy phase counterdiffusion, ultimately form the soldered seam 8 in Fig. 1.
In order to verify the effect of above-mentioned connection method, the tube-plate joint for completing connection is detected, is specially：It is right
Tube-plate joint carries out liquid penetration examination and ultrasound detection, joint quality meet the acceptance requirement of ASME NB one-level parts,
In addition, butt joint carries out 5.5MPa, pressurize 10min hydraulic pressure test, joint No leakage.Testing result proves Tube Sheet of Heat Exchanger-pipe
Plate quality of connection fully meets MSR operating mode requirement.
What above example absolutely proved that the inventive method can meet between anticorrosion superalloy tube-plate completely reliable connects
Connect, the development for advanced nuclear reactor is significant；Especially the inventive method can realize that thickness reaches 130mm thickness
The safe and reliable connection of big thickness tube sheet and pipe, so as to greatly improve the service life of MSR heat exchanger and security, this
It is that prior art can not be realized.
Claims (11)
1. anticorrosion superalloy tube-plate connection method, it is characterised in that comprise the following steps：
Step 1, the pore for processing on tube sheet diameter 0.08~0.16mm bigger than tube outer diameter, around described on the upside of tube sheet
The machining of drilling is used to placing the U-shaped ring-type feeding groove of solder ring, the internal diameter of U-shaped ring-type feeding groove not less than tube outer diameter+
1mm, and the U-shaped ring-type feeding groove of connection and pore are set and along the circumferentially equally distributed multiple feed holes of pore；
Step 2, pipe is passed through into pore and causes pipe lower end to protrude tube sheet underside plan, tube sheet then is protruded to pipe lower end
The part of underside plan carries out tube expansion so that tube outer diameter maximum is bigger 0.5mm than pore diameter after tube expansion, finally by under pipe
Side pressure enters pore, makes pipe lower end until concordant with tube sheet underside plan；
Step 3, fusion welds are carried out to junction on the downside of pipe lower end and tube sheet, weld penetration is not less than the wall thickness of pipe；
Step 4, carry out vacuum brazing after inserting solder ring in the U-shaped ring-type feeding groove.
2. tube-plate connection method as claimed in claim 1, it is characterised in that the material of the solder ring is golden nickel alloy.
3. tube-plate connection method as claimed in claim 2, it is characterised in that the quality proportioning of the golden nickel alloy is 82%Au
And 18%Ni.
4. tube-plate connection method as claimed in claim 3, it is characterised in that the technological parameter of the vacuum brazing is specific such as
Under：The vacuum 10 of vacuum brazing-2More than pa, programming rate is not more than 10 DEG C/min, 900 DEG C of insulation 20min of pilot process, pricker
1000~1020 DEG C, 20~60min of soaking time of temperature is welded, less than 400 DEG C are down to the rate of temperature fall no more than 5 DEG C/min
Come out of the stove after temperature.
5. tube-plate connection method as claimed in claim 1, it is characterised in that add in advance around the pore on the downside of tube sheet
Work has the U-shaped ring groove for reducing fusion welds stress, and the internal diameter of the U-shaped ring groove is not less than+2 times of tube walls of tube outer diameter
Thickness, U-shaped ring groove width are not less than pipe wall thickness, and U-shaped ring groove depth is not less than pipe wall thickness.
6. tube-plate connection method as claimed in claim 1, it is characterised in that the axis of the feed hole and tube bore axis it
Between into 30 ° of angles.
7. tube-plate connection method as claimed in claim 1, it is characterised in that using hard alloy pressure head to pipe in step 2
The part that lower end protrudes tube sheet underside plan carries out hydraulic expanding tube, and pipe lower end then is pressed into pore using hydraulic press.
8. tube-plate connection method as claimed in claim 1, it is characterised in that the fusion welds are argon tungsten-arc welding, its work
Skill parameter is specific as follows：The flow of argon gas is 15L/min, electrode to workpiece distance 1mm, welding current 45A, speed of welding
10mm/s。
9. tube-plate connection method as claimed in claim 1, it is characterised in that the anticorrosion superalloy is used for MSR
Nickel base superalloy.
10. tube-plate connection method as claimed in claim 9, it is characterised in that the MSR is with nickel base superalloy
Hastelloy N alloys or GH3535 alloys.
11. a kind of anticorrosion superalloy heat exchanger, including one group of pipe being connected with tube sheet, it is characterised in that the tube sheet
It is connected with pipe by the connection method of any one of claim 1~10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610532317.9A CN106001825B (en) | 2016-07-08 | 2016-07-08 | Anticorrosion superalloy pipe tube sheet connection method and heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610532317.9A CN106001825B (en) | 2016-07-08 | 2016-07-08 | Anticorrosion superalloy pipe tube sheet connection method and heat exchanger |
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| CN106001825A CN106001825A (en) | 2016-10-12 |
| CN106001825B true CN106001825B (en) | 2018-03-30 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108031941A (en) * | 2017-12-20 | 2018-05-15 | 中国航发贵州红林航空动力控制科技有限公司 | A kind of method of high temperature alloy and Co-based powder metallurgical material vacuum brazing |
| CN111375856B (en) * | 2018-12-27 | 2021-11-05 | 航天海鹰(哈尔滨)钛业有限公司 | Method for welding high-efficiency capillary heat exchanger |
| CN110977074B (en) * | 2019-11-21 | 2021-10-22 | 中国航发沈阳黎明航空发动机有限责任公司 | Furnace brazing method of nickel-based high-temperature alloy material |
| CN112229063A (en) * | 2020-10-19 | 2021-01-15 | 绍兴森田换热器有限公司 | Heat absorbing sheet and stainless steel heat exchanger with same |
| CN114147362A (en) * | 2021-12-08 | 2022-03-08 | 西北有色金属研究院 | Method for improving corrosion resistance of stainless steel pipe plate joint weld of space nuclear reactor container |
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| CN106001825A (en) | 2016-10-12 |
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