CN107598332A - The welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel - Google Patents
The welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel Download PDFInfo
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- CN107598332A CN107598332A CN201710962431.XA CN201710962431A CN107598332A CN 107598332 A CN107598332 A CN 107598332A CN 201710962431 A CN201710962431 A CN 201710962431A CN 107598332 A CN107598332 A CN 107598332A
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- 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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
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- Physics & Mathematics (AREA)
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- Organic Chemistry (AREA)
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- Plasma & Fusion (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses the welding of large-diameter pipe road and Technology for Heating Processing in a kind of novel C B2 heat resisting steel, wlding is chosen；Polish and clear up around welding groove debris in the range of 50mm；100%PT detections are carried out to welding groove, in group to preceding, argon filling heating and thermal insulation integration frock is set in novel C B2 heat resisting steel at large-diameter pipe road inner distance welding groove 200mm as sealed gas chamber, argon filling heating and thermal insulation integration frock one end be incubated baffle plate centre bore in insert argon gas pipeline, by argon gas pipeline into sealed gas chamber argon filling；The inner and outer wall in large-diameter pipe road in novel C B2 heat resisting steel is preheated simultaneously by argon filling heating and thermal insulation integration frock；Bottoming is welded, and is welded using GTAW and is carried out two layers of welding；Cover welding is filled, is welded using SMAW and carries out two channel welds；After being cooled to 80 DEG C by weldment after the completion of welding and be incubated 1h, post weld heat treatment is carried out using argon filling heating and thermal insulation integration frock.Present invention reduces the labor intensity of welder, welding quality ensure that.
Description
Technical field
The present invention relates to pipeline welding Technology for Heating Processing, large-diameter pipe road welds in a kind of novel C B2 heat resisting steel of specific design
And Technology for Heating Processing.
Background technology
Novel C B2 heat resisting steel has good intensity, toughness, creep resistance, excellent high-temperature oxidation resistance and corrosion-resistant
Performance, gradually it is applied to the heat-resisting steels of the equipment such as firepower plant heating system.The specific trade mark of novel C B2 heat resisting steel is
ZG12Cr9Mo1Co1NiVNbNB, it is a kind of novel C B2 ferritic heat-resistant steels, therefore the excellent spy with ferritic heat-resistant steel
Property, such as excellent thermal conductivity, low thermal coefficient of expansion, good anti intercrystalline corrosion and anti-stress corrosion performance and relatively low
Production cost, the thermal efficiency of generating set can be improved.The multiple elements design that CB2 heat resisting steel is high Cr strengthens heat resisting steel, mainly adopts
With add alloying elements cr, Mo, Co, Ni, V, Nb and micro N, B element Alloying Design and reasonably combined improve its high temperature
Performance.Its main alloying element species and content are all more similar to T91 heat resisting steel.
Efficient extra-supercritical unit construction and development become current international hot issue, unit operation parameter
Constantly improve and higher requirement is proposed to the material of critical component, after novel C B2 heat resisting steel is researched and developed successfully, by the fortune of unit
Trip temperature is from 600 DEG C of liftings to 620 DEG C, therefore the welding in large-diameter pipe road and Technology for Heating Processing will be into novel C B2 heat resisting steel
For the emphasis of firepower construction project welding research.
Because such a new material is in service stage at initial stage at present, both at home and abroad for this novel C B2 heat resisting steel
Research on Weldability it is considerably less, to meet the longtime running of unit, give full play to the potential of new type steel, the application passes through collection
The mechanical property of CB2 steel chemical compositions and material, select suitable welding material to carry out welding procedure qualification test, summarize simultaneously
Before weldering, the welding hints on operation of welding process and postwelding, have studied in a kind of novel C B2 heat resisting steel at the welding of large-diameter pipe road and heat
Science and engineering skill, widely used for the popularization of novel C B2 heat resisting steel from now on and welding technique support is provided, for carrying again for unit operation parameter
Height lays the foundation.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the invention provides large-diameter pipe road in a kind of novel C B2 heat resisting steel to weld
Connect and Technology for Heating Processing, the welding and Technology for Heating Processing large-diameter pipe road welding quality stable can in novel C B2 heat resisting steel is handled
Lean on.
The technical solution adopted in the present invention is：
The welding of large-diameter pipe road and Technology for Heating Processing, comprise the following steps in a kind of novel C B2 heat resisting steel：
(1) required according to the chemical composition, mechanical property and its welding technological properties of novel C B2 heat resisting steel, choose wlding；
(2) polish the welding groove in large-diameter pipe road in novel C B2 heat resisting steel, and clear up large-diameter pipe in novel C B2 heat resisting steel
Debris in the range of 50mm around the welding groove in road；
(3) 100%PT detections are carried out to the welding groove in large-diameter pipe road in novel C B2 heat resisting steel, in novel C B2 heat resisting steel
The welding groove surface flawless in large-diameter pipe road is qualified；
(4) before large-diameter pipe road is grouped in the two novel C B2 heat resisting steel for welding needs, in novel C B2 heat resisting steel
Argon filling heating and thermal insulation integration frock is set to be filled as sealed gas chamber at middle large-diameter pipe road inner distance welding groove 200mm
Insertion argon gas pipeline in the centre bore of one end insulation baffle plate of argon heating and thermal insulation integration frock, by argon gas pipeline to closed gas
Indoor argon filling；
(5) it is same to the inner and outer wall in large-diameter pipe road in novel C B2 heat resisting steel by argon filling heating and thermal insulation integration frock
Shi Jinhang is preheated；
(6) bottoming is welded, and is welded using GTAW and is carried out two layers of welding；Cover welding is filled, is gone forward side by side using SMAW welding
The channel welds of row two, control the diameter for being no more than welding rod per thickness degree, and width is no more than 4 times of core diameter；
(7) after the completion of welding, weldment is cooled to 80 DEG C, and after being incubated 1h, using argon filling heating and thermal insulation integration frock,
Mode based on multi-region temperature control, multi-point temperature measurement carries out post weld heat treatment.
Further, in the step (1), the chemical composition ranges of novel C B2 heat resisting steel are (%)：Cr：=9.11,
Mo：=1.59, Co：=1.27；Mechanical property requirements are：Tensile strength：>=690Mpa, surrender are slight：≥490Mpa.
Further, in the step (1), from the welding wires of Φ 2.4 and the welding rods of Φ 3.2.
Further, in the step (4), the argon filling heating and thermal insulation integration frock includes two heating frocks and two
The individual insulation baffle plate being separately positioned on the outside of two heating frocks, two are heated frocks and two insulation baffle combinations into closed gas
Room.
Further, in the step (4), the welding slope in air tube large-diameter pipe road from novel C B2 heat resisting steel can also be used
Insertion sealed gas chamber in mouth gap carries out nitrogen charging.
Further, in the step (5), preheating temperature is 200-250 DEG C, makes large-diameter pipe road in novel C B2 heat resisting steel
Inner and outer wall reach preheating temperature requirement.
Further, in the step (6), the welding condition of GTAW welding is：Welding current 90-100A, interlayer
200-250 DEG C of temperature.
Further, in the step (6), the welding condition of SMAW welding is：Welding current 80-120A, interlayer
200-300 DEG C of temperature.
Further, in the step (7), the detailed process of post weld heat treatment is：The large-diameter pipe in novel C B2 heat resisting steel
The position while welding arrangement temperature-control heat couple in road, the weld seam both sides heat affected area in large-diameter pipe road respectively sets one in novel C B2 heat resisting steel
Individual temperature thermocouple, monitor the temperature of heat affected area, heated using flexible ceramic heater, arrangement scope should using weld seam as
Center, it is ensured that samming scope meets the requirements；It is incubated using alumina silicate insulation blanket, is along the circumferential direction wrapped up on the heaters,
Insulation width is counted from Weld pipe mill, should be than heater width increase at least 2 times of wall thickness per side；Argon filling built in being used inside pipeline
Heating and thermal insulation integration frock is heated so that the inner and outer walls of pipeline temperature difference reaches or less than standard requirement.
Further, in the step (7), in PWHT procedures, post weld heat treatment temperature is 730-750 DEG C, weldering
Programming rate≤80 DEG C, cooling rate≤60 DEG C are heat-treated afterwards.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) present invention realizes the welding and heat treatment to large-diameter pipe road in novel C B2 heat resisting steel, reduces the work of welder
Intensity, welding quality is ensure that, and by reasonably controlling welding and heat treatment process parameter, obtained welding point is once
Qualification rate is high, welding point combination property is more excellent；
(2) present invention argon filling, heating, heat insulation integrated frock built in large-diameter pipe road in novel C B2 heat resisting steel, both can be with
Ensure argon-filled protection effect, and can reduces pipeline preheating, the inside and outside wall temperature difference of post weld heat treatment, improves the matter of welding and heat treatment
Amount；
(3) weldment is cooled to after 80 DEG C of insulation 1h by the present invention after the completion of welding carries out post weld heat treatment, at postwelding heat
Reason uses built-in argon filling heating and thermal insulation frock so that the inner and outer walls of pipeline temperature difference reaches standard requirement and is even less than standard requirement.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.
Fig. 1 is the welding of large-diameter pipe road and Technology for Heating Processing flow chart in novel C B2 heat resisting steel disclosed in the embodiment of the present invention.
Embodiment
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
As background technology is introduced, presence in the prior art can not realize that large-diameter pipe road welds in novel C B2 heat resisting steel
The deficiency for connecing and being heat-treated, in order to solve technical problem as above, present applicant proposes large-diameter pipe in a kind of novel C B2 heat resisting steel
Road welds and Technology for Heating Processing.
In a kind of typical embodiment of the application, as shown in Figure 1, there is provided big footpath in a kind of novel C B2 heat resisting steel
Pipeline welding and Technology for Heating Processing, the technique comprise the following steps：
(1) wlding is chosen, and is required according to the chemical composition, mechanical property and its welding technological properties of novel C B2 heat resisting steel,
The welding wires of 616 Φ of MTS 2.4 and the welding rods of MTS 5Co1 Φ 3.2 from Bole company；
(2) polish the welding groove in large-diameter pipe road in novel C B2 heat resisting steel, and clear up large-diameter pipe in novel C B2 heat resisting steel
The debris such as oil, paint, dirt and iron rust in the range of 50mm around the welding groove in road；
(3) 100%PT detections are carried out to the welding groove in large-diameter pipe road in novel C B2 heat resisting steel, in novel C B2 heat resisting steel
The welding groove surface flawless in large-diameter pipe road is qualified, it is ensured that the welding groove surface in large-diameter pipe road in novel C B2 heat resisting steel
The defects of flawless；
(4) before large-diameter pipe road is grouped in the two novel C B2 heat resisting steel for welding needs, in novel C B2 heat resisting steel
Argon filling heating and thermal insulation integration frock is set to be filled as sealed gas chamber at middle large-diameter pipe road inner distance welding groove 200mm
Insertion argon gas pipeline in the centre bore of one end insulation baffle plate of argon heating and thermal insulation integration frock, by argon gas pipeline to closed gas
Indoor argon filling；
(5) it is same to the inner and outer wall in large-diameter pipe road in novel C B2 heat resisting steel by argon filling heating and thermal insulation integration frock
Shi Jinhang is preheated, and preheating temperature is 200-250 DEG C, the inner and outer wall in large-diameter pipe road in novel C B2 heat resisting steel is reached pre-
Hot temperature requirement；
(6) bottoming is welded, and is welded using GTAW and is carried out two layers of welding, welding condition is：Welding current 90-
100A, 200-250 DEG C of interlayer temperature；Cover welding is filled, is welded using SMAW and carries out two channel welds, controls heat input,
Avoid interlayer temperature too high, welding condition is：Welding current 80-120A, 200-300 DEG C of interlayer temperature；Control is per thickness
Degree is no more than the diameter of welding rod, and width is no more than 4 times of core diameter,；
(7) after the completion of welding, weldment is cooled to 80 DEG C, and after being incubated 1h, using argon filling heating and thermal insulation integration frock
Carry out post weld heat treatment so that the inner and outer walls of pipeline temperature difference reaches standard requirement and is even less than standard requirement, PWHT procedures
In, post weld heat treatment temperature is 730-750 DEG C, post weld heat treatment programming rate≤80 DEG C, cooling rate≤60 DEG C, at postwelding heat
Width of heating and insulation width are managed according to pipeline specifications, is strictly performed by technique, it is ensured that samming scope meets the requirements.
In the present embodiment, in the step (1), novel C B2 heat resisting steel is that 1.27% is added on the basis of P91 steel
Co, while a small amount of Nb and B are added, what the appropriate content for increasing Mo obtained, in order to improve the high-temperature mechanics of steel
Energy；The chemical composition ranges and mechanical property of novel C B2 heat resisting steel are as shown in Table 1 and Table 2：
The chemical composition list (%) of the novel C B2 heat resisting steel of table 1
| C | Cr | Ni | Co | Mo | V | Nb | B | N |
| 0.13 | 9.11 | 0.14 | 1.27 | 1.59 | 0.21 | 0.054 | 0.01 | 0.015 |
The novel C B2 heat resisting steel of table 2 mechanical property at room temperature
According to the chemical composition, mechanical property and its welding technological properties of novel C B2 heat resisting steel, from the weldering of Bole company
The silk Φ 2.4 of MTS 616 and welding rod MTS 5Co1 Φ 3.2.Welding wire MTS 616 and welding rod the MTS 5Co1 of Bole company chemistry into
Point, mechanical property it is suitable with novel C B2 heat resisting steel, and using welding wire MTS 616 and welding rod MTS the 5Co1 welderings of Bole company
It is functional to connect CB2 steel welding technologies.
In the present embodiment, the argon filling heating and thermal insulation integration frock includes two heating frocks and two are set respectively
In the insulation baffle plate that two are heated on the outside of frock, two are heated frocks and two insulation baffle combinations into sealed gas chamber；It is described to add
Thermal technology, which fills, includes large-diameter pipe frame, tracklayer heater and high temperature resistant load-bearing pulley, along the circumferential direction uniform on the large-diameter pipe frame
The symmetrical square hole of two row is disposed with, the insulation closure plate is provided with the outside of the large-diameter pipe frame, wherein on an insulation closure plate
It is provided with centre bore；It is provided with alumina silicate heat-preservation cotton on the inwall of the large-diameter pipe frame, uniform cloth on the outer wall of the large-diameter pipe frame
Multiple tracklayer heaters are equipped with, multiple high temperature resistant load-bearing have also been evenly arranged on the outer wall of the large-diameter pipe frame and have been slided
Wheel, the high temperature resistant load-bearing pulley is between two adjacent tracklayer heaters；Middle part in the large-diameter pipe frame is set
There is cross support frame, the cross support frame includes vertically disposed support tube and is horizontally set on the support tube hub
Hollow steel pipe, through there is a rigid drawstring in the hollow steel pipe, one end of the rigid drawstring is incubated closure plate with one and fixed
Connection, the other end extend the big footpath thick-walled pipe of 9%~12%Cr martensite heat-resistant steels by the centre bore on another insulation closure plate
Road.
On the basis of above-described embodiment, in step described in one embodiment of the invention (4), air tube can be also used from new
The welding groove gap insertion sealed gas chamber in large-diameter pipe road carries out nitrogen charging in type CB2 heat resisting steel.
The welding of large-diameter pipe road and Technology for Heating Processing, its institute in the novel C B2 heat resisting steel that one embodiment of the invention is provided
State in step (7), use multi-region temperature control, the mode of multi-point temperature measurement carry out the detailed process of post weld heat treatment for：In novel C B2
The position while welding arrangement temperature-control heat couple in large-diameter pipe road in heat resisting steel, the weld seam both sides heat in large-diameter pipe road in novel C B2 heat resisting steel
The zone of influence respectively sets a temperature thermocouple, monitors the temperature of heat affected area, is heated using flexible ceramic heater, arranges
Scope should be centered on weld seam, and post weld heat treatment width of heating is strictly performed according to pipeline specifications by designation of heat treatment, it is ensured that
Warm scope meets the requirements；It is incubated, thickness at least 50mm, is along the circumferential direction wrapped on the heaters using alumina silicate insulation blanket
Wrap up in, insulation width is counted from Weld pipe mill, should be than heater width increase at least 2 times of wall thickness per side；Built in being used inside pipeline
Heating and thermal insulation frock so that the inner and outer walls of pipeline temperature difference reaches standard requirement and is even less than standard requirement.
As can be seen from the above description, the application the above embodiments realize following technique effect：
(1) present invention realizes the welding and heat treatment to large-diameter pipe road in novel C B2 heat resisting steel, reduces the work of welder
Intensity, welding quality is ensure that, and by reasonably controlling welding and heat treatment process parameter, obtained welding point is once
Qualification rate is high, welding point combination property is more excellent；
(2) present invention argon filling, heating, heat insulation integrated frock built in large-diameter pipe road in novel C B2 heat resisting steel, both can be with
Ensure argon-filled protection effect, and can reduces pipeline preheating, the inside and outside wall temperature difference of post weld heat treatment, improves the matter of welding and heat treatment
Amount；
(3) weldment is cooled to after 80 DEG C of insulation 1h by the present invention after the completion of welding carries out post weld heat treatment, at postwelding heat
Reason uses built-in argon filling heating and thermal insulation frock so that the inner and outer walls of pipeline temperature difference reaches standard requirement and is even less than standard requirement.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (10)
1. the welding of large-diameter pipe road and Technology for Heating Processing in a kind of novel C B2 heat resisting steel, it is characterized in that, comprise the following steps：
(1) required according to the chemical composition, mechanical property and its welding technological properties of novel C B2 heat resisting steel, choose wlding；
(2) polish the welding groove in large-diameter pipe road in novel C B2 heat resisting steel, and clear up large-diameter pipe road in novel C B2 heat resisting steel
Debris in the range of 50mm around welding groove；
(3) 100%PT detections are carried out to the welding groove in large-diameter pipe road in novel C B2 heat resisting steel, big footpath in novel C B2 heat resisting steel
The welding groove surface flawless of pipeline is qualified；
(4) it is big in novel C B2 heat resisting steel before large-diameter pipe road is grouped in the two novel C B2 heat resisting steel for welding needs
Argon filling heating and thermal insulation integration frock is set at the pipeline inner distance welding groove 200mm of footpath as sealed gas chamber, in argon filling plus
Insertion argon gas pipeline in the centre bore of one end insulation baffle plate of the heat insulation integrated frock of heat, by argon gas pipeline into sealed gas chamber
Argon filling；
(5) inner and outer wall in large-diameter pipe road in novel C B2 heat resisting steel is entered simultaneously by argon filling heating and thermal insulation integration frock
Row preheating；
(6) bottoming is welded, and is welded using GTAW and is carried out two layers of welding；Cover welding is filled, is welded using SMAW and carries out two
Channel welds, control the diameter for being no more than welding rod per thickness degree, and width is no more than 4 times of core diameter；
(7) after the completion of welding, weldment is cooled to 80 DEG C, and after being incubated 1h, using argon filling heating and thermal insulation integration frock, is based on
Multi-region temperature control, the mode of multi-point temperature measurement carry out post weld heat treatment.
2. the welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel according to claim 1, it is characterized in that, institute
State in step (1), the chemical composition ranges of novel C B2 heat resisting steel are (%)：Cr：=9.11, Mo：=1.59, Co：=1.27；
Mechanical property requirements are：Tensile strength：>=690Mpa, surrender are slight：≥490Mpa.
3. the welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel according to claim 1, it is characterized in that, institute
State in step (1), from the welding wires of Φ 2.4 and the welding rods of Φ 3.2.
4. the welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel according to claim 1, it is characterized in that, institute
State in step (4), the argon filling heating and thermal insulation integration frock includes two heating frocks and two are separately positioned on two and add
Thermal technology fills the insulation baffle plate in outside, two heating frocks and two insulation baffle combinations into sealed gas chamber.
5. the welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel according to claim 1, it is characterized in that, institute
State in step (4), can also use the welding groove gap insertion sealed gas chamber in air tube large-diameter pipe road from novel C B2 heat resisting steel to enter
Row nitrogen charging.
6. the welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel according to claim 1, it is characterized in that, institute
State in step (5), preheating temperature is 200-250 DEG C, the inner and outer wall in large-diameter pipe road in novel C B2 heat resisting steel is reached pre-
Hot temperature requirement.
7. the welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel according to claim 1, it is characterized in that, institute
State in step (6), the welding condition of GTAW welding is：Welding current 90-100A, 200-250 DEG C of interlayer temperature.
8. the welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel according to claim 1, it is characterized in that, institute
State in step (6), the welding condition of SMAW welding is：Welding current 80-120A, 200-300 DEG C of interlayer temperature.
9. the welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel according to claim 1, it is characterized in that, institute
State in step (7), the detailed process of post weld heat treatment is：The position while welding arrangement control in large-diameter pipe road in novel C B2 heat resisting steel
Galvanic couple is warmed, the weld seam both sides heat affected area in large-diameter pipe road respectively sets a temperature thermocouple, monitoring heat in novel C B2 heat resisting steel
The temperature of the zone of influence；Heated using flexible ceramic heater, arrangement scope should be centered on weld seam, it is ensured that samming scope accords with
Close and require；It is incubated using alumina silicate insulation blanket, is along the circumferential direction wrapped up on the heaters, insulation width is calculated from Weld pipe mill
Rise, should be than heater width increase at least 2 times of wall thickness per side；Argon filling heating and thermal insulation integration frock built in being used inside pipeline is entered
Row heating so that the inner and outer walls of pipeline temperature difference reaches or less than standard requirement.
10. the welding of large-diameter pipe road and Technology for Heating Processing in novel C B2 heat resisting steel according to claim 1, it is characterized in that, institute
State in step (7), in PWHT procedures, post weld heat treatment temperature is 730-750 DEG C, post weld heat treatment programming rate≤80
DEG C, cooling rate≤60 DEG C.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710962431.XA CN107598332B (en) | 2017-10-16 | 2017-10-16 | Novel CB2 heat-resistant steel medium-large diameter pipeline welding and heat treatment process |
| PCT/CN2018/109395 WO2019076208A1 (en) | 2017-10-16 | 2018-10-09 | Welding and heat treatment process for medium-to-large diameter pipeline of novel cb2 heat-resistant steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710962431.XA CN107598332B (en) | 2017-10-16 | 2017-10-16 | Novel CB2 heat-resistant steel medium-large diameter pipeline welding and heat treatment process |
Publications (2)
| Publication Number | Publication Date |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019076208A1 (en) * | 2017-10-16 | 2019-04-25 | 中国电建集团山东电力建设第一工程有限公司 | Welding and heat treatment process for medium-to-large diameter pipeline of novel cb2 heat-resistant steel |
| CN111215731A (en) * | 2019-11-06 | 2020-06-02 | 中国化学工程第六建设有限公司 | Welding and heat treatment method of high-temperature and high-pressure TP347 pipe |
| CN111304520A (en) * | 2020-03-30 | 2020-06-19 | 共享铸钢有限公司 | Method for smelting CB2 material by electric arc furnace |
| CN112191986A (en) * | 2020-09-25 | 2021-01-08 | 中国化学工程第六建设有限公司 | Method for controlling cracks and air holes in welding process of 800HT pipeline |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107598332B (en) | 2020-05-08 |
| WO2019076208A1 (en) | 2019-04-25 |
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