CN105722630B - The welded joint structure of thick-wall large-diameter pipe and its welding procedure method - Google Patents
The welded joint structure of thick-wall large-diameter pipe and its welding procedure method Download PDFInfo
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- CN105722630B CN105722630B CN201480062611.7A CN201480062611A CN105722630B CN 105722630 B CN105722630 B CN 105722630B CN 201480062611 A CN201480062611 A CN 201480062611A CN 105722630 B CN105722630 B CN 105722630B
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- diameter pipe
- intermediate member
- wall large
- main body
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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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/053—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 30% but less than 40%
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/04—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler and characterised by material, e.g. use of special steel alloy
-
- 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
- B23K2101/06—Tubes
-
- 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
- B23K2101/10—Pipe-lines
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/18—Dissimilar materials
- B23K2103/26—Alloys of Nickel and Cobalt and Chromium
Abstract
To by containing Cr in terms of weight %：20~35%, Mo：0.1~10%, Al：0.1~3%, Ti：0.11~3%, Ni：The intermediate member that the width that the Ni base system alloys of surplus are formed by a pair of of thick-wall large-diameter main pipe (1) and same material is about 60mm implements hot-working or cold working in advance respectively, after the range of part at least to becoming final weld part included in the scene for being provided with boiler implements solution treatment, it is finally welded between the intermediate member at the scene for being provided with boiler, the welded joint structure of the thick-wall large-diameter pipe of high reliability can be obtained by this method.
Description
Technical field
The present invention relates to a kind of welded joint structure of thick-wall large-diameter pipe and its welding method, the welderings of the thick-wall large-diameter pipe
It connects joint structure to be formed by Ni base system alloys, is used for the ultra supercritical pressure of new generation that main steam temperature reaches 700 DEG C or so
In header, main steam pipe and reheated steam pipe of the high-temperature portion of the main machine of electric equipment, i.e. boiler etc.；More particularly to
When the scene for being provided with boiler does not have as manufacturing works large-scale Equipment for Heating Processing, the aforementioned scene for being provided with boiler into
The welded joint structure and its welding procedure method of reheat crack(ing) are not likely to produce when the welding of the final weld part of row.
Background technology
In the high-temperature portion of aforementioned generating equipment boiler, heat-transfer pipe, piping use heat resisting steel mostly.Among these, collection
The large-diameter pipes such as flow tube, main steam pipe and reheated steam pipe use always 2.25~11%Cr series heat-resistant steels.In recent years, exist
Under the background for inhibiting carbon dioxide discharge, especially in coal-fired steam power plant, constantly carried to improve generating efficiency
The temperature for the steam that height generates in aforementioned boiler, now, what is operated is that the coal-fired firepower that main steam temperature is 600 DEG C is sent out
Electric equipment.
In addition, for the purpose for further increasing generating efficiency, the generating equipment that main steam temperature is 700 DEG C is being carried out
Exploitation.In the high-temperature area of such vapor (steam) temperature, existing heat resisting steel in terms of intensity and corrosion resistance there are problem,
It can not use, therefore, it is necessary to use solution strengthening type or the Ni base system alloys of the high intensity of precipitation strength type.
In the boiler for the generating equipment for being 700 DEG C for aforementioned main steam temperature by the Ni base system alloys of these high intensity
When, it is ensured using carrying out quenched to the metal structure of Ni base system alloys using strengthening mechanisms such as solution strengthening, precipitation strengths
The material of elevated temperature strength, but when for actual machine, due to the analysis in metallic crystal (sometimes referred to simply as following crystallize) crystal grain
Go out hardening constituent, to which the intensity in crystal grain becomes higher than the intensity of crystal boundary.Therefore, creep is easy to concentrate on crystal boundary, with existing material
Material is compared, and the sensibility of reheat crack(ing) caused by thermal cycle when for by welding is got higher sometimes.
In addition, in the header of the high-temperature portion of the boiler of aforementioned generating equipment, main steam pipe and reheated steam pipe etc.
The Ni based alloys of the aforementioned high intensity used are the thick-wall large-diameter pipe of such as wall thickness 20mm or more, diameter 165.2mm or more, but preceding
Header, main steam pipe and reheated steam pipe etc. is stated to use with several meters~tens of meters of length.It should be noted that
In the main steam pipe of the high-temperature portion of the boiler of the mounted generating equipment using current material, reheated steam pipe, using straight
The steam pipe of diameter 500,600mm or larger diameter.
As aforementioned high intensity Ni base system alloys, there are the Alloy617 (52Ni-22Cr-13Co- of such as solution strengthening type
Alloy263 (50Ni-20Cr-20Co-6Mo-2Ti-Al), the Alloy740 (50Ni- of 9Mo-Ti-1Al, precipitation strength type
25Cr-20Co-2Nb-2Ti-Al)。
In the process that these alloys are made to the wall thickness large-diameter pipe of such as wall thickness 20mm or more, outer diameter 165.2mm or more,
The ingot casting for obtaining target product length, wall thickness is manufactured first, is then fully processed using applications such as forgings and is gradually produced
Product size, aforementioned high intensity Ni base system alloys are high-strength alloy, therefore are difficult under the usual manufacturing capacity of material producer
The product of long size is produced, such as it is 3m products below to be generally up to about energy factory length, therefore, degree of finish becomes to compare
It is small.It should be noted that degree of finish is the final length of original length before the processing indicated by aforementioned ingot casting, thickness to product
It spends, the index of the deflection of thickness.
In general, having the tendency that the degree of finish the big more easily becomes sappy structure, recrystallization temperature is lower.Before manufacture
When stating the thick-wall large-diameter pipe of high intensity Ni base system alloys, size of microcrystal becomes such as 200~300 μm of thicker coarse grain.To
The thick-wall large-diameter pipe of material producer manufacture is bought by boiler producer, and size of microcrystal when boiler producer buys is as previously described for for example
200~300 μm of thicker coarse grain.
At the position for concentrating such high intensity Ni base system alloys for structure upper stress, due to coarsening crystal grain
Ductility and toughness reduce, be initially generated at fine crack at crystal grain boundary propagate needed for limit stress reduce, to
It is easy to propagate fine crack under smaller stress.
There are the welderings at multiple positions in the thick-wall large-diameter pipe used as main steam pipe, reheated steam pipe especially in boiler
There is the welding heat affected zone for bearing to weld caused thermal cycle, but this near the weld part of aforementioned welding point in connector
The crystal grain at place coarsening more than non-solder portion, and then also it is noted following problem：Due to there is residual stress when welding, because
The risk (Port テ Application シ ヤ Le) that reheat crack(ing) occurs in this is high.
Fig. 3 is shown in the weldering for being provided with the site operation of the boiler of aforementioned thick-wall large-diameter pipe (such as Alloy617) and being formed
The imaginary drawing of the issuable reheat crack(ing) of heat affected zone of socket part.The weldering of thick-wall large-diameter pipe 1 will be included shown in Fig. 3 (A)
The amplification of sectional view near the weld part of socket part 2 is illustrated in Fig. 3 (B).
In Fig. 3, in the state of heat treatment after welding, bent with material since the inner face side in weld part 2 exists
The heat affected zone 3 for taking the residual stress of the comparable stretching of stress and being generated due to being welded is than basic stitch coarse
Tissue, weld part 2 easy tos produce reheat crack(ing) 4 made of the construction at the scene of thick-wall large-diameter pipe 1,1.
In order to avoid reheat crack(ing) 4 shown in Fig. 3 (B), in addition in weld part and including welding heat affected model after welding
It encloses other than reduction of the heat treatment to seek the stress of weld part 2 after interior welded, it is expected that being improved as follows：Make weld part
And the size of microcrystal grain refined of the thick-wall large-diameter pipe 1 comprising welding heat affected range.But aforementioned high intensity Ni base system alloys
Thick-wall large-diameter pipe 1,1 to be bought from material producer when the tissue of state use, therefore size of microcrystal is larger, for for example
200~300 μm, in turn, coarsening progress occurs for the welding heat affected zone of final weld part, although can reduce welding in reality
The stress in portion 2, but size of microcrystal is almost unchanged.
In addition, thick-wall large-diameter pipe (the hereinafter sometimes referred to installing pipe used in actual machine.) weld part, sweating heat
When generating reheat crack(ing) in the range of to a certain degree of influence portion will include usually the part in bad portion caused by crackle
After removal, use same material prepare as green wood short tube, be provided with boiler scene by welding will install material and newly
Material connects.For example, using long tube necessary length is cut into and the new pipe that makes is as aforementioned short tube.
In order to remove the residual stress after welding to the weld part and welding heat affected zone of aforementioned installing pipe and short tube,
It needs to carry out solution treatment or Stabilizing Heat Treatment.The material of these thick-wall large-diameter pipes formed by the Ni base system alloys of high intensity
The solid solution temperature of itself is very high at 1200 DEG C or so, in turn, in order to make material entirety thermally equivalent, heating and cooling
When temperature gradient be restricted, the retention time must also be set as such as 1 hour or so, thus for carry out solution treatment and
Speech, needs the long period.In addition, although Stabilizing Heat Treatment is lower than aforementioned solid solution temperature, it also requires being 900 DEG C or more
High temperature, the retention time needs to be set as time longer than the solution treatment time (such as needing 1 hour per 25mm wall thickness).
For such heat treatment condition, the operation that actually carries out be technically difficulty is high, in terms of operating environment with
The operation of difficulty.For example, actual heat treatment operation position is mostly the higher position of boiler, therefore need to take foot certainly
Enough Security Countermeasures, and due to the heat treatment for extreme high-temperature, in the setting place of heating power supply, the heating wires
There is limitation in terms of length, in turn, needs to match to be ready for use on to keep sufficient thermal insulating material of high temperature etc. for a long time.To not have
In the welding at the scene of the setting boiler of standby necessary Equipment for Heating Processing, it is expected that by under the high temperature such as solution treatment, stabilization processes
The number being heat-treated for a long time is set as enough and minimum numbers.
Present applicant has proposed the patented inventions for being related to following welding method：In order to prevent boiler stainless steel tube (but
Aforementioned high intensity Ni base systems alloy) material year in year out new weld part reheat crack(ing), by the conduct of length 20mm or more
The short tube of green wood is respectively welded at the weld part of material year in year out, the pipe inner face side progress grinding or smooth or right to weld part
Weld part is implemented, for the annealing except destressing, to weld between green wood, to reduce the residual stress (patent document of weld part
1)。
Existing technical literature
Patent document
Patent document 1：No. 4303159 bulletins of Japanese Patent No.
Invention content
The subject that the invention solves
It (52Ni-22Cr-13Co-9Mo-Ti-1Al, is precipitated by force in aforementioned high intensity Ni base systems alloy, such as Alloy617
Alloy263 (50Ni-20Cr-20Co-6Mo-2Ti-Al), the Alloy740 (50Ni-25Cr-20Co-2Nb-2Ti-Al) of change type
In the case of, as described above, manufactured thick-wall large-diameter pipe size of microcrystal occur coarse, especially aforementioned size of microcrystal by
Heat when welding influences and further coarsening.Will be between the thick-wall large-diameter pipe of such aforementioned high intensity Ni base system alloys
When as final weld part, know：The tissue of state when due to being bought from material producer uses, size of microcrystal compared with
Greatly, it is such as 200~300 μm, in turn, the welding heat affected zone coarsening of final weld part is in progress, although passing through welding
High temperature afterwards, prolonged heat treatment can reduce the stress of weld part, but size of microcrystal is almost unchanged, generates reheat crack(ing)
Risk becomes larger.
In addition, being produced in the installing pipe used in actual machine near the weld part or weld part of crackle
Welding heat affected zone when being repaired, the joint structure for needing the generation risk that reheat crack(ing) is made small.
Problem of the present invention is that provide the thick-wall large-diameter pipe for preventing the Ni base system alloys by high intensity from being formed,
The welded joint structure and welding procedure method of the reheat crack(ing) easy tod produce at the weld part that boiler setting is formed in situ.
Means for solving the problems
For the above subject of the present invention, field welding joints structure and the welding procedure side of a kind of high reliability are provided
Method.
Invention described in scheme 1 is a kind of welded joint structure of thick-wall large-diameter pipe, which is characterized in that by following
Ni base system alloys be formed by a pair of of wall thickness be 20mm or more, a diameter of 165.2mm or more thick-wall large-diameter pipe main body (1) and with
Thick-wall large-diameter pipe main body (1) same material and compared to the thick-wall large-diameter pipe main body (1) be short tube intermediate member (5)
Implement the mechanical processing comprising hot-working or cold working in advance and make, at least to becoming most included in the scene for being provided with boiler
After the range of the part of whole weld part implements solution treatment, it will be arranged between the end of aforementioned a pair of of intermediate member (5,5) side
There is the scene of boiler finally to be welded and obtained, the Ni base systems alloy contains Cr in terms of weight %：20~35%, Mo：0.1
~10%, A1：0.1~3%, Ti：0.1~3%, Ni：Surplus, the intermediate member (5) and the thick-wall large-diameter pipe main body (1)
It compares, degree of finish is high and by grain refined.
Invention described in scheme 2 is the welded joint structure of the thick-wall large-diameter pipe according to scheme 1, which is characterized in that
Implement solution treatment, included in be provided with boiler scene become final weld part part ranging from include by heavy wall it is big
The overall length of intermediate member (5) after diameter pipe main body (1) and intermediate member (5) welding and the weldering with thick-wall large-diameter pipe main body (1)
The range of socket part.
Invention described in scheme 3 is the welded joint structure of the thick-wall large-diameter pipe according to scheme 1, which is characterized in that
Implement solution treatment, included in be provided with boiler scene become final weld part part ranging from intermediate member (5)
Entirety, after the whole implementation solution treatment of the intermediate member (5), by thick-wall large-diameter pipe main body (1) and intermediate member (5)
Welding, in order to remove or mitigate residual stress when welding, to the weldering comprising thick-wall large-diameter pipe main body (1) and intermediate member (5)
The range of socket part implements solution treatment or implements the heat treatment carried out at a temperature of less than the solid solution temperature, then will
It is finally welded at boiler setting scene between the end of a pair of of intermediate member (5,5) side, to obtain.
Invention described in scheme 4 is a kind of welding procedure method of thick-wall large-diameter pipe, which is characterized in that by following Ni
Base system alloy be formed by a pair of of wall thickness be 20mm or more, the thick-wall large-diameter pipe main body of a diameter of 165.2mm or more (1) and with institute
State thick-wall large-diameter pipe main body (1) same material and pre- compared to the intermediate member (5) that the thick-wall large-diameter pipe main body (1) is short tube
First implement the mechanical processing comprising hot-working or cold working and make, at least to becoming final included in the scene for being provided with boiler
After the range of the part of weld part implements solution treatment, boiler will be provided between aforementioned a pair of of intermediate member (5,5) side
It is finally welded at scene.Contain Cr in terms of weight %：20~35%, Mo：0.1~10%, Al：0.1~3%, Ti：0.1~
3%, Ni：Surplus, for the intermediate member (5) compared with the thick-wall large-diameter pipe main body (1), degree of finish is high and by grain refined.
Invention described in scheme 5 is the welding procedure method of the thick-wall large-diameter pipe according to scheme 4, which is characterized in that
Implement solution treatment, included in be provided with boiler scene become final weld part part ranging from include by heavy wall it is big
The overall length of intermediate member (5) after diameter pipe main body (1) and intermediate member (5) welding and the weldering with thick-wall large-diameter pipe main body (1)
The range of socket part.
Invention described in scheme 6 is the welding procedure method of the thick-wall large-diameter pipe according to scheme 4, which is characterized in that
Implement solution treatment, included in be provided with boiler scene become final weld part part ranging from intermediate member (5)
Entirety, after the whole implementation solution treatment of aforementioned intermediate member (5), by thick-wall large-diameter pipe main body (1) and intermediate member (5)
Welding, in order to remove or mitigate residual stress when welding, to the weldering comprising thick-wall large-diameter pipe main body (1) and intermediate member (5)
After the range of socket part implements solution treatment or implements the heat treatment carried out at a temperature of less than the solid solution temperature, by one
It is finally welded at boiler setting scene between the end of intermediate member (5,5) side.
The effect of invention
Invention described in scheme 1,4 according to the present invention, a new generation to reaching 700 DEG C for main steam temperature is super to face
Header, main steam pipe and the reheated steam pipe of boundary's pressure electric equipment formed by high intensity Ni base system alloys etc., metal
The welding point formed at the scene for organizing the thick-wall large-diameter pipe 1 being made of coarse grain structure, uses advance with same material
A pair of of the intermediate member 5,5 implemented the mechanical processing comprising hot-working or cold working and made, to aforementioned intermediate member 5,5
After the range implementation solution treatment for the part for becoming final weld part at the scene for being provided with boiler, by aforementioned centre
It is finally welded between component 5, the generation of reheat crack(ing) can be prevented, and can scene be set in boiler and be easy to carry out welding
Operation.
It should be noted that the thick-wall large-diameter pipes such as the header used in boiler, main steam pipe and reheated steam pipe
(sometimes referred to as installing pipe) 1 leads to that degree of finish is low, forms coarse grain structure due to the manufacturing capacity of material producer, and intermediate structure
Part 5 is comparably thinner particulate due to that can obtain high degree of finish for short tube, with aforementioned installing pipe 1, and being capable of shape
At Deformation structure, in turn, by solution treatment, Aforesaid deformation has organized the formation of thinner sappy structure, thus in the foregoing between
After being welded between component 5, reheat crack(ing) will not be generated being heat-treated.
According to the invention described in scheme 2,5, other than the The effect of invention described in scheme 1,4, by by aforementioned centre
The length of component 5 is set as carrying out solution treatment to the weld part of comprising 5 overall length of intermediate member and 1 side of installing pipe at the scene
Length, aforementioned intermediate member 5 is welded to aforementioned thick-wall large-diameter pipe 1, then aforementioned range carry out solution treatment, so as to
So that aforementioned intermediate member 5 is generated sappy structure, is heat-treated even if the final weld part not between aforementioned intermediate member 5
Not will produce reheat crack(ing), it can be achieved that welded reliability raising.
According to the invention described in scheme 3,6, other than the The effect of invention described in scheme 1,4, due in advance to aforementioned
Intermediate member 5 is whole to be dissolved, therefore grain refined tissue is generated in 5 entirety of intermediate member, even if being provided with showing for boiler
Final weld part of the field not between aforementioned intermediate member 5 is heat-treated, and will not generate reheat crack(ing), it can be achieved that welding knot
The raising of the reliability of structure.In turn, it by the aforementioned thick-wall large-diameter pipe 1 of last stage and can also have passed through in aforementioned solution treatment
Between component 5 weld after heat treatment be set below under solid solution temperature, main purpose be reduction residual stress it is steady
Fixedization is heat-treated.By being set as aforementioned Stabilizing Heat Treatment, compared with the case where carrying out solution treatment, thick-wall large-diameter can be reduced
The coarse grains of the welding heat affected zone of 5 side of aforementioned intermediate member of pipe 1.
Description of the drawings
Fig. 1 is the welded joint structure and welding procedure method for the Ni base system alloy thick-wall large-diameter pipes for showing embodiment 1
Figure.
Fig. 2 is the welded joint structure and welding procedure method for the Ni base system alloy thick-wall large-diameter pipes for showing embodiment 2
Figure.
Fig. 3 is the welded joint structure and welding procedure method for illustrating Ni base systems alloy thick-wall large-diameter pipe in the prior art
The problem of figure.
Specific implementation mode
The embodiment of the present invention is illustrated together with attached drawing below.
It should be noted that Fig. 1 and embodiment shown in Fig. 2 are in the case of novel setting and to having used
Structure repaired in the case of can adapt to.
Embodiment 1
Fig. 1 be illustrate that the present embodiment, as capital equipment, the i.e. pot in ultra supercritical pressure electric equipment of new generation
The welded joint structure of thick-wall large-diameter pipe in stove and welding procedure method, the pipe weld part construction until final welding
The figure of situation.
First, as shown in Fig. 1 (A), to by Ni base system alloys (Alloy617；52Ni-22Cr-13Co-9Mo-Ti-1Al)
The thick-wall large-diameter pipe 1,1 that a pair of of wall thickness is formed by as 20mm, a diameter of 165.2mm, length 3m is respectively welded by material producer
The wall thickness formed by same material made is the intermediate member (short tube) 5,5 of 20mm, a diameter of 165.2mm, length 150mm.
It should be noted that being obtained as follows in steel pipe manufacturing firm of the aforementioned thick-wall large-diameter pipe 1 in material producer：By casting
The cylinder of major diameter is made to be hot-forged for ingot, and the processing such as hot extrusion, drawing is carried out to it and forms long cylindrical shape, last profit
It is machined into and the surfaces externally and internally of oxidation is cut, be refined to design size.It should be noted that the pipe that diameter is smaller
Sometimes it is manufactured also by cold working.To which the degree of finish of the aforementioned thick-wall large-diameter pipe 1 of making is relatively low, and size of microcrystal compares
Slightly, it is 200 μm~300 μm.
In addition, aforementioned intermediate member 5 can also be manufactured in previous materials producer, in order to improve degree of finish and shape in the present invention
At Deformation structure, made by hot forging or cold forging in forging producer.First, length and shape are gone out by forging and molding, it is interior
Processing is formed to make by reaming in diameter.With following feature：Size of microcrystal is 100 μm~200 μm, with aforementioned heavy wall
Large-diameter pipe 1 is comparably particulate, but is the Deformation structure with multiple sliding surfaces in crystal grain.
Then, at least will include whole aforementioned intermediate member 5 and aforementioned thick-wall large-diameter pipe 1 and preceding as shown in Fig. 1 (B)
The range for stating the weld part 6 of intermediate member 5 implements the solution treatment of stipulated time at a temperature of 1175 ± 20 DEG C of holding, to
Deformation structure's grain refined of intermediate member 5 can be made to 100 μm hereinafter, the residual stress of weld part 6 can be removed simultaneously, thus
The sensibility of reheat crack(ing) can be reduced.It should be noted that the aforementioned retention time is such as 1 hour or so, need for should
Time obtained by time is added with the time needed for heating and cooling.
In addition, as the Ni base system alloys used in the embodiment of the present invention, in addition to above-mentioned Alloy617 (52Ni-22Cr-
Other than 13Co-9Mo-Ti-1Al), Alloy263 (50Ni-20Cr-20Co-6Mo-2Ti-Al) or Alloy740 can also be used
The Ni such as (50Ni-25Cr-20Co-2Nb-2Ti-Al) base system alloys.
It should be noted that closing the length (L) of the intermediate member 5 being made of short tube in an embodiment of the present invention, examine
Consider range thermally influenced when weld part width and the welding of the final weld part in boiler setting scene, is narrow at the former
In the case of the multiple-bead deposit of groove, the width of the end layer of an intermediate member 5 is about 10mm, and the latter is about 2.5 times, is located at
The width of the end layer of the weld part 6 of an intermediate member 5 thereon is about 10mm, is set as three's addition, i.e. 10+25+10
=45mm or more.
In addition, the upper limit of the length of intermediate member 5 in an embodiment of the present invention is closed, firstly, it is necessary to be set as forging
Producer can get the upper length limit of larger degree of finish when making, in turn, need for can to comprising 5 overall length of aforementioned intermediate member and
The length of solution treatment is carried out with the range of the weld part of 1 main body of aforementioned thick-wall large-diameter pipe.If as described above, for by aforementioned heavy wall
1 main body of large-diameter pipe is endowed the intermediate member 5 of larger degree of finish (such as 20% or more), then is generated again by above-mentioned solution treatment
Crystallization forms the sappy structure for being not likely to produce reheat crack(ing).
It should be noted that, although be limited to obtain the length of the whole degree of finish of intermediate member 5, but in new production,
When the workshop with large-scale Equipment for Heating Processing carries out the solution treatment of Fig. 1 (B), intermediate member 5 can be set as longer.This
Outside, in the case where aforementioned thick-wall large-diameter pipe 1 is installing pipe, then can be dissolved in the environment of being restricted at the scene
The length of processing.
Then, it as shown in Fig. 1 (C), will be carried out finally in the scene for being provided with boiler between intermediate member 5,5 finally
When welding forms weld part 7 and connects, since intermediate member 5 is sappy structure, even if without high temperature such as solution treatment
Stress removal heat treatment, the sensibility of reheat crack(ing) are also low.
To which the present embodiment can be real in the boiler plant manufacturing works for having Equipment for Heating Processing or boiler setting scene
The stage of Fig. 1 (A) and Fig. 1 (B) are applied, finally, the final welding that scene carries out the stage of Fig. 1 (C) is set in boiler.
Embodiment 2
Fig. 2 is the boiler of capital equipment as ultra supercritical pressure electric equipment of new generation that is illustrating that the present embodiment
In thick-wall large-diameter pipe welded joint structure and welding procedure method, the pipe weld part construction shape until final welding
The figure of condition.
First, as shown in Fig. 2 (A) and (C), a pair of of wall thickness 20mm, straight is formed by Ni base systems alloy (Alloy617)
Diameter 165.2mm, the thick-wall large-diameter pipe 1,1 (with reference to Fig. 2 (C)) of length 3m and the wall thickness 20mm, the diameter that are formed by same material
The intermediate member 5 of 165.2mm, length 250mm, similarly to Example 1 in order to improve degree of finish, formed Deformation structure and forging
Producer is made by hot forging or cold forging to be made.First, length and shape are gone out by forging and molding, internal diameter is carried out by reaming
Forming is to make.With following feature：Size of microcrystal is 100 μm~200 μm, is 200 μm~300 μm with size of microcrystal
The aforementioned thick-wall large-diameter pipe 1 of thicker coarse grain be comparably particulate, but be the Deformation structure with multiple sliding surfaces in crystal grain.
It is identical when the lower limit of the length of aforementioned intermediate member, the upper limit are with Fig. 1.
Then, whole to the intermediate member 5 being made of Deformation structure shown in Fig. 2 above-mentioned (A) to have hot place in advance
The boiler plant manufacturing works for managing equipment implement solution treatment, to make intermediate member 5 integrally become as shown in Fig. 2 (B)
Sappy structure.It should be noted that if having Equipment for Heating Processing, then also can solution heat treatment be carried out in place at the scene.Make
It, can be by the solution treatment of implementation stipulated time at a temperature of 1175 ± 20 DEG C of holding, thus will for aforementioned solution treatment
Deformation structure's grain refined of intermediate member 5 is to 100 μm or less.
Then, similarly to Example 1 that thick-wall large-diameter pipe 1,1 is short with the conduct of solution treatment as Fig. 2 (C)
The intermediate member 5,5 of pipe is welded in weld part 6,6 respectively, as shown in Fig. 2 (D), with thick-wall large-diameter pipe 1,1 and intermediate member 5,5
Each weld part 6,6 or so centered on carry out solution treatment or Stabilizing Heat Treatment.
When carrying out solution treatment as aforementioned heat treatment, due to making intermediate member by the solution treatment of Fig. 2 (B)
5 entirety becomes sappy structure, thus while including 1 side of thick-wall large-diameter pipe after thick-wall large-diameter pipe 1 and intermediate member 5 weld
Weld part 6 in the range of size of microcrystal coarsening also occurs, but include the crystal grain of the range of the weld part 6 of 5 side of intermediate member
Grain size will not coarsening.Due to the residual stress after the welding of the range comprising aforementioned weld part by solution treatment by except
It goes, therefore the problem of also reheat crack(ing) is not present in the coarsening portion of the size of microcrystal of 1 side of aforementioned thick-wall large-diameter pipe.
In addition, on the basis of the residual stress of range of the removal comprising aforementioned weld part, it is aforementioned in order to prevent to include thickness
Size of microcrystal coarsening in the range of the weld part of 1 side of wall large-diameter pipe, thus it is possible to vary solution treatment and carry out stabilizing hot place
Reason.Aforementioned Stabilizing Heat Treatment such as 900 DEG C or more, i.e. be less than solution treatment temperature carry out, therefore can prevent include
The size of microcrystal coarsening of the range of the weld part of 1 side of thick-wall large-diameter pipe.
The heat treatment of Fig. 2 (D) also can with Fig. 1 (B) the case where in the same manner as with large-scale Equipment for Heating Processing factory or
Scene carries out, in the present embodiment, need not be in 1 side of thick-wall large-diameter pipe since the grain refined of intermediate member has been carried out
Weld part comprising intermediate member 5 integrally carry out solution treatment, including a part carries out, in aforementioned thick-wall large-diameter pipe
In the case that 1 is installing pipe, when in the environment restricted at the scene whole to intermediate member 5 solution treatment can not be carried out
Also the structure that can be used.
The residual stress when purpose of the solution treatment or Stabilizing Heat Treatment is to remove the welding of weld part 6,6.This
Outside, the length about intermediate member 5 is dissolved to whole due to first passing through Fig. 2 (B) in advance, can be set as than implementing
The length of the intermediate member 5 of example 1 is longer, is set as 250mm here, unlike the case where embodiment 1, is being difficult to pass through Fig. 1
(C) construction, which integrally carries out intermediate member the case where solution processing, inferior can also implement.
Finally, as shown in Fig. 2 (E), weld part 7 is formed by being welded at the scene between the intermediate member 5,5 for sappy structure,
To obtain the improvement of reheat cracking susceptibility in the same manner as the joint structure of embodiment 1.
To which the present embodiment can be real in the boiler plant manufacturing works for having Equipment for Heating Processing or boiler setting scene
The stage of Fig. 2 (D) is applied, the final welding that scene carries out the stage of Fig. 2 (E) finally is set in boiler.
Symbol description
1 thick-wall large-diameter pipe main pipe
Weld part between 2 main pipes
The heat affected zone of weld part between 3 main pipes
4 reheat crack(ing)s
5 intermediate members
The weld part of 6 intermediate members and thick-wall large-diameter pipe main pipe
Weld part between 7 intermediate members
Claims (6)
1. a kind of welded joint structure of thick-wall large-diameter pipe, which is characterized in that
To being formed by a pair of thickness that there is wall thickness for 20mm or more, a diameter of 165.2mm or more by following Ni base system alloys
Wall large-diameter pipe main body (1) and with thick-wall large-diameter pipe main body (1) same material and compared to the thick-wall large-diameter pipe main body (1)
It is made for advance mechanical processing of the implementation comprising hot-working or cold working of component of the intermediate member (5) of short tube, at least to packet
It is contained in the range implementation solution treatment for being provided with the scene of boiler as the part of final weld part, then by a pair of component
Intermediate member (5,5) side end between finally welded and obtained at the scene for being provided with boiler, wherein the Ni bases
It is that alloy contains Cr in terms of weight %：20~35%, Mo：0.1~10%, Al：0.1~3%, Ti：0.1~3%, Ni：Surplus,
For the intermediate member (5) compared with the thick-wall large-diameter pipe main body (1), degree of finish is high and by grain refined.
2. the welded joint structure of thick-wall large-diameter pipe according to claim 1, which is characterized in that implement solution treatment,
Included in be provided with boiler scene become final weld part part ranging from include by thick-wall large-diameter pipe main body (1) and in
Between intermediate member (5) after component (5) welding overall length and range with the weld part of thick-wall large-diameter pipe main body (1).
3. the welded joint structure of thick-wall large-diameter pipe according to claim 1, which is characterized in that
Implement solution treatment, included in be provided with boiler scene become final weld part part ranging from intermediate member
(5) entirety,
After the whole implementation solution treatment of the intermediate member (5), thick-wall large-diameter pipe main body (1) and intermediate member (5) are welded
It connects, in order to remove or mitigate residual stress when welding, to the welding comprising thick-wall large-diameter pipe main body (1) and intermediate member (5)
The range in portion implements solution treatment or implements the heat treatment carried out at a temperature of less than the solid solution temperature, then by one
It is finally welded at boiler setting scene between the end of intermediate member (5,5) side of the component, to obtain.
4. a kind of welding procedure method of thick-wall large-diameter pipe, which is characterized in that being formed by one by following Ni base system alloys
To with wall thickness be 20mm or more, a diameter of 165.2mm or more thick-wall large-diameter pipe main body (1) and with the thick-wall large-diameter pipe master
Body (1) same material and implement to wrap in advance compared to the component of intermediate member (5) that the thick-wall large-diameter pipe main body (1) is short tube
Mechanical processing containing hot-working or cold working and make, at least to becoming final weld part included in the scene for being provided with boiler
Partial range implements solution treatment, then will be provided with boiler between intermediate member (5,5) side of a pair of component
It is finally welded at scene, wherein the Ni base systems alloy contains Cr in terms of weight %：20~35%, Mo：0.1~10%,
Al：0.1~3%, Ti：0.1~3%, Ni：Surplus, the intermediate member (5) add compared with the thick-wall large-diameter pipe main body (1)
Work degree is high and by grain refined.
5. the welding procedure method of thick-wall large-diameter pipe according to claim 4, which is characterized in that implement solution treatment,
Included in be provided with boiler scene become final weld part part ranging from include by thick-wall large-diameter pipe main body (1) and in
Between intermediate member (5) after component (5) welding overall length and range with the weld part of thick-wall large-diameter pipe main body (1).
6. the welding procedure method of thick-wall large-diameter pipe according to claim 4, which is characterized in that implement solution treatment,
Become the entirety of the ranging from intermediate member (5) of the part of final weld part included in the scene for being provided with boiler,
After the whole implementation solution treatment of the intermediate member (5), thick-wall large-diameter pipe main body (1) and intermediate member (5) are welded
It connects, in order to remove or mitigate residual stress when welding, to the welding comprising thick-wall large-diameter pipe main body (1) and intermediate member (5)
The range in portion implements solution treatment or implements the heat treatment carried out at a temperature of less than the solid solution temperature, then by one
It is finally welded at boiler setting scene between the end of intermediate member (5,5) side of the component.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-238842 | 2013-11-19 | ||
| JP2013238842A JP6118714B2 (en) | 2013-11-19 | 2013-11-19 | Welded joint structure of thick-walled large-diameter pipe and its welding method |
| PCT/JP2014/080339 WO2015076218A1 (en) | 2013-11-19 | 2014-11-17 | Welded-joint structure in thick-walled large-diameter pipe, and welding method therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105722630A CN105722630A (en) | 2016-06-29 |
| CN105722630B true CN105722630B (en) | 2018-10-23 |
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| CN201480062611.7A Active CN105722630B (en) | 2013-11-19 | 2014-11-17 | The welded joint structure of thick-wall large-diameter pipe and its welding procedure method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6118714B2 (en) |
| CN (1) | CN105722630B (en) |
| WO (1) | WO2015076218A1 (en) |
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| CN107116361B (en) * | 2017-04-25 | 2019-03-15 | 中国化学工程第三建设有限公司 | The pressure testing of Steam Turbine jet chimney entirety, whole Stressless Pipeline Connection construction method |
| CN110883504B (en) * | 2018-09-11 | 2021-03-26 | 中国石化工程建设有限公司 | Method for welding and stabilizing heat treatment steel pipe |
| CN112475554A (en) * | 2020-11-13 | 2021-03-12 | 东方电气集团东方锅炉股份有限公司 | Welding process of dissimilar aging strengthening alloy pipe for 700-DEG C grade boiler |
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- 2014-11-17 WO PCT/JP2014/080339 patent/WO2015076218A1/en active Application Filing
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| CN101784685A (en) * | 2007-08-31 | 2010-07-21 | 日立金属株式会社 | Low-thermal-expansion ni-based super-heat-resistant alloy for boiler and having excellent high-temperature strength, and boiler component and boiler component production method using the same |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6118714B2 (en) | 2017-04-19 |
| WO2015076218A1 (en) | 2015-05-28 |
| CN105722630A (en) | 2016-06-29 |
| JP2015098047A (en) | 2015-05-28 |
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Address after: Kanagawa Prefecture, Japan Patentee after: Mitsubishi Power Co., Ltd Address before: Kanagawa Prefecture, Japan Patentee before: MITSUBISHI HITACHI POWER SYSTEMS, Ltd. |