CN109280761A - A kind of field acidic environment carbon steel pipe stress-removal construction operation method - Google Patents
A kind of field acidic environment carbon steel pipe stress-removal construction operation method Download PDFInfo
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- CN109280761A CN109280761A CN201811423664.3A CN201811423664A CN109280761A CN 109280761 A CN109280761 A CN 109280761A CN 201811423664 A CN201811423664 A CN 201811423664A CN 109280761 A CN109280761 A CN 109280761A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
Abstract
The present invention provides a kind of field acidic environment carbon steel pipe stress-removal construction operation methods, the described method comprises the following steps: selecting predetermined heat area around weld seam, and arrange heater and thermocouple in predetermined heat area；Predetermined heat area is heated using the heater, thermocouple detects temperature to after 380 DEG C~430 DEG C, predetermined heat area is heated to 600 DEG C~655 DEG C with the heating speed no more than 200 DEG C/h, after keeping the temperature the t period, 380 DEG C~430 DEG C are cooled to the cooling velocity no more than 260 DEG C/h, is cooled to room temperature；Hardness determination is carried out to the zone of influence after weld seam, heating and main pipe respectively.Operational method of the invention can be effectively solved weld seam part residual stress concentrations, lead to the problem of the anti-brittle failure ability difference of welding point；There are hard and crisp tissues for weld dimensions in effective solution welding point, lead to the problem of welding point resistance to corrosion difference.
Description
Technical field
The invention belongs to welding technology fields, more particularly, are related to a kind of field acidic environment carbon steel pipe stress-removal and apply
Work operational method, acidic environment carbon steel piping butt weld hydrogen sulfide corrosion resistance, which can be improved, can require to want with service performance
It asks, it is ensured that the safe handling of pipeline.
Background technique
In recent years with increasingly paying attention to environmental protection, the demand of the natural gas of clean and environmental protection is dramatically increased,
Promote that more and more acid-soluble oil gas fields are developed and built.In natural gas process units, carbon steel is using most
Extensively, the maximum material of usage amount.And acidic environment carbon steel piping weld seam is since the residual stress generated in welding process is in sulphur
Change and be easy to happen hydrogen induced cracking and sulfide corrosion cracking under hydrogen environmental activity and acid carbon steel piping leakage occurs, or even explosion
Risk, there are huge security risks.Therefore it is suitable for acidic environment carbon steel piping stress-removal construction operation method to guarantee
The safety of acid carbon steel piping and use are particularly important.
Summary of the invention
It is above-mentioned existing in the prior art it is an object of the present invention to solving for the deficiencies in the prior art
One or more problems.For example, one of the objects of the present invention is to provide one kind to pass through with from meeting the anti-corruption of acidic environment weld seam
Corrosion can set out with the requirement of physicochemical property, study the residual stress and metallographic structure form that influence corrosion, propose one
Kind can preferably meet the exploitation and pipe-line construction requirement of petroleum gas acid gas field, can be improved pipeline service life,
The acidic environment carbon steel pipe stress-removal construction operation method of maintenance, repair cost can be reduced.
To achieve the goals above, of the invention to provide a kind of field acidic environment carbon steel pipe stress-removal construction operation side
Method, the method may include following steps: selecting predetermined heat area around weld seam, and arranges heater in predetermined heat area
And thermocouple；Predetermined heat area is heated using the heater, thermocouple detects temperature to after 380 DEG C~430 DEG C, with
Predetermined heat area is heated to 600 DEG C~655 DEG C by the heating speed no more than 200 DEG C/h, after keeping the temperature the t period, to be not more than
The cooling velocity of 260 DEG C/h is cooled to 380 DEG C~430 DEG C, is cooled to room temperature, wherein when the carbon steel pipe pipe thickness is little
When 25mm, the soaking time t is 0.8h~1.2h；
When the carbon steel pipe pipe thickness is greater than 25mm, the soaking time t at least (0.8+ (b-25)/25) h~
(1.2+ (b-25)/25) h, b indicate carbon steel pipe pipe thickness, and unit is millimeter；Respectively to the zone of influence and mother after weld seam, heating
Pipe carries out hardness determination.
In an exemplary embodiment of field acidic environment carbon steel pipe stress-removal construction operation method of the invention, when
When the carbon steel pipe nominal diameter is greater than or equal to 100mm, carbon steel pipe straight tube is heated, the heater is by the first semicircle arc portion
It is formed with the second semicircle arc portion, the first semicircle arc portion and the second semicircle arc portion can enclose carbon steel pipe to heat to it, institute
State the first heating layer group of the first semicircle arc portion and the second semicircle arc portion by the first insulating layer of outer layer and on the inside of outer layer
At to carbon steel pipe bend pipe and threeway heating, the heater is protected by the second heating layer and second for wrapping up the second heating layer
Warm layer composition, second heating layer are rope type heater；When the carbon steel pipe nominal diameter is less than 100mm, the heating
Third insulating layer of the device by third heating layer and for wrapping up third heating layer forms, and the third heating layer is rope type heating
Device.
In an exemplary embodiment of field acidic environment carbon steel pipe stress-removal construction operation method of the invention, institute
State the first insulating layer with a thickness of 42mm~56mm, along carbon steel pipe pipe shaft axial direction, the width of the first insulating layer either side
It is 100mm or more wide to spend width more ipsilateral than first heating layer.
In an exemplary embodiment of field acidic environment carbon steel pipe stress-removal construction operation method of the invention, edge
Carbon steel pipe pipe shaft axial direction, second heating layer and third heating layer width be 6 times or more of weld width and width not
Less than 120mm, second insulating layer is 1 times or more of the second heating layer width, and the third insulating layer is described the
1 times or more of three heating layer width.
In an exemplary embodiment of field acidic environment carbon steel pipe stress-removal construction operation method of the invention, when
When the carbon steel pipe outside diameter is greater than or equal to 508mm, thermocouple arranges 2 or more even number roots, is with carbon steel pipe kernel of section
The angle in the center of circle, every thermocouple is equal；When the carbon steel pipe outside diameter is less than 508mm, thermocouple arranges 2 or less.
In an exemplary embodiment of field acidic environment carbon steel pipe stress-removal construction operation method of the invention, when
When the carbon steel pipe outside diameter is greater than or equal to 508mm, thermocouple arranges 2, and first is located at the carbon steel tube section 6 with thermocouple
O'clock position, second thermocouple be located at 2 o'clock of carbon steel tube section position or 10 o'clock position；When outside the carbon steel pipe
When diameter is less than 508mm, thermocouple arranges 1, and the thermocouple is located at 2 o'clock of carbon steel tube section or 10 o'clock position.
In an exemplary embodiment of field acidic environment carbon steel pipe stress-removal construction operation method of the invention, point
Other includes that butt welding respectively is sewn on 12 o'clock of carbon steel tube section, at 3 points to the zone of influence after weld seam, heating and main pipe progress hardness determination
Clock and 6 o'clock position, the zone of influence is in 12 o'clock of carbon steel tube section, 3 o'clock and 6 o'clock position and main pipe in carbon steel pipe after heating
12 o'clock of section, 3 o'clock and 6 o'clock position carry out hardness determination, and the highest hardness value after each test point detection is not more than 210 cloth
Family name's hardness, average value are not more than 200 Brinell hardness.
In an exemplary embodiment of field acidic environment carbon steel pipe stress-removal construction operation method of the invention, point
Other includes that butt welding respectively is sewn on 12 o'clock of carbon steel tube section, at 9 points to the zone of influence after weld seam, heating and main pipe progress hardness determination
Clock and 6 o'clock position, the zone of influence is in 12 o'clock of carbon steel tube section, 9 o'clock and 6 o'clock position and main pipe in carbon steel pipe after heating
12 o'clock of section, 9 o'clock and 6 o'clock position carry out hardness determination, and the highest hardness value after each test point detection is not more than 210 cloth
Family name's hardness, average value are not more than 200 Brinell hardness.
In an exemplary embodiment of field acidic environment carbon steel pipe stress-removal construction operation method of the invention, institute
It states that heating zone heat and is heated using intelligent temperature control equipment control heater, the intelligent temperature control equipment includes distribution
Cabinet, intelligent temperature control unit and output unit, the power distribution cabinet is connect by intelligent temperature control unit with the output unit, described
Output unit includes heating power supply conducting wire and compensating wire, and the heating power supply conducting wire is connect with the heater, for being to add
Hot device provides power supply, and the compensating wire is connect with the thermocouple.
In an exemplary embodiment of field acidic environment carbon steel pipe stress-removal construction operation method of the invention, institute
Stating intelligent temperature control equipment to 2 or more weld bonds while can carry out stress-removal construction operation simultaneously.
Compared with prior art, the beneficial effect of field acidic environment carbon steel pipe stress-removal construction operation method of the invention
Include:
(1) effective solution weld seam part residual stress concentrations, lead to the problem of the anti-brittle failure ability difference of welding point；
(2) weld dimensions lead to welding point there are hard and crisp tissue in effective solution welding point
The problem of resistance to corrosion difference；
(3) in effective solution weld seam free hydrogen presence, lead to the problem of weld seam resistance to corrosion difference.
Detailed description of the invention
By the description carried out with reference to the accompanying drawing, above and other purpose of the invention and feature will become more clear
Chu, in which:
Fig. 1 shows the field acidic environment carbon steel pipe stress-removal construction operation method of an illustrative embodiment of the invention
Intelligent temperature control equipment connection plan schematic diagram.
Fig. 2 shows the field acidic environment carbon steel pipe stress-removal construction operation methods of an illustrative embodiment of the invention
Threeway and bend pipe heater arrangement schematic diagram, wherein (a) indicate tee joint heater arrangement schematic diagram, (b) indicate bend pipe heating
Device arrangement schematic diagram.
Fig. 3 shows the field acidic environment carbon steel pipe stress-removal construction operation method of an illustrative embodiment of the invention
Carbon steel pipe straight tube heater arrangement schematic diagram.
Fig. 4 shows the field acidic environment carbon steel pipe stress-removal construction operation method of an illustrative embodiment of the invention
Thermocouple arrangement schematic diagram, wherein (a) indicate carbon steel pipe outside diameter be greater than or equal to 508mm carbon steel pipe thermocouple layout drawing,
(b) indicate that carbon steel pipe outside diameter is less than the carbon steel pipe thermocouple layout drawing of 508mm.
Fig. 5 shows the field acidic environment carbon steel pipe stress-removal construction operation method of an illustrative embodiment of the invention
Construction operation method technological parameter schematic diagram.
Fig. 6 shows the field acidic environment carbon steel pipe stress-removal construction operation method of an illustrative embodiment of the invention
Process simplified schematic diagram.
Specific embodiment
Hereinafter, acidic environment carbon in field according to the present invention will be described in detail in conjunction with attached drawing and exemplary embodiment
Steel pipe stress-removal construction operation method.
Fig. 1 shows the field acidic environment carbon steel pipe stress-removal construction operation method of an illustrative embodiment of the invention
Intelligent temperature control equipment connection plan schematic diagram.Fig. 2 shows the field acidic environments of an illustrative embodiment of the invention
The threeway and bend pipe heater arrangement schematic diagram of carbon steel pipe stress-removal construction operation method, wherein (a) indicates tee joint heater cloth
Schematic diagram is set, (b) indicates bend pipe heater arrangement schematic diagram.Fig. 3 shows the field acid of an illustrative embodiment of the invention
The carbon steel pipe straight tube heater arrangement schematic diagram of property environment carbon steel pipe stress-removal construction operation method.Fig. 4 shows the present invention one
The thermocouple arrangement schematic diagram of the field acidic environment carbon steel pipe stress-removal construction operation method of a exemplary embodiment, wherein
(a) it indicates that carbon steel pipe outside diameter is greater than or equal to the carbon steel pipe thermocouple layout drawing of 508mm, (b) indicates that carbon steel pipe outside diameter is less than
The carbon steel pipe thermocouple layout drawing of 508mm.Fig. 5 shows the field acidic environment carbon steel pipe of an illustrative embodiment of the invention
The construction operation method technological parameter schematic diagram of stress-removal construction operation method.Fig. 6 shows an example of the present invention implementation
The field acidic environment carbon steel pipe stress-removal construction operation method process simplified schematic diagram of example.
The present invention provides a kind of field acidic environment carbon steel pipe stress-removal construction operation methods.In field acid of the invention
In one exemplary embodiment of property environment carbon steel pipe stress-removal construction operation method, the construction operation method may include:
Step (1), heat treatment connecting line select predetermined heat area, arrange heater and thermocouple.
In this example, stress-removal operation wiring is carried out using intelligent temperature control equipment, as shown in Figure 1, the intelligent temperature control
Equipment may include power distribution cabinet, intelligent temperature control unit and output unit.The power distribution cabinet passes through power supply line and the intelligent temperature
Control unit connection.The intelligent temperature control unit is connect with the output unit.The output unit includes heating power supply line and benefit
Repay conducting wire.The heating power supply line is connect with the heater, for providing electric energy for heater to carry out to predetermined heat area
Heating.The compensating wire is connect with the thermocouple.The intelligent temperature control equipment can simultaneously carry out 2 or more weld bonds
Stress-removal operation simultaneously, can be such that operating efficiency is maximized.
In this example, when the nominal diameter of the carbon steel pipe is greater than or equal to 100mm when (>=DN100), for carbon
When steel pipe straight tube is heated, the heater can be made of the first semicircle arc portion and second semicircle arc portion two parts.It is described
First semicircle arc portion and the second semicircle arc portion, which can close up, wraps up the carbon steel pipe for a full circle to heat to it.First semicircle
Arc portion and the second semicircle arc portion are made of the first insulating layer of outer layer and the first heating layer of internal layer.First insulating layer and first
Heating layer is available to be mechanically combined.Naturally in conjunction with mode it is without being limited thereto, such as compression combine also may be used.It is preferred that
, the first insulating layer can be heat-preservation cotton, and the thickness of heat-preservation cotton can be 42mm~56mm, it is preferred that can be 50mm.It is described
First heating layer can be crawler type heat block.The width of the first insulating layer either side is more ipsilateral than first heating layer
The wide 100mm or more of width.Carbon steel pipe of the heater being arranged using the present invention to nominal diameter more than or equal to 100mm is added
Heat is made as semi arch structure, heating tape and insulating layer can be integrated into one.In field construction, not only greatly shorten
The hot-treatment heating equipment set-up time, improve heat treatment construction efficiency.And above structure is to preventing the heat loss from having pole
Good heat insulation effect, to reducing, energy consumption effect is obvious, while each position of welding line joint is heated evenly and controllably.
In this example, the bend pipe of (>=DN100) and threeway when being greater than or equal to 100mm for the nominal diameter of carbon steel pipe
When being heated, as shown in Fig. 2, Fig. 2 (a) indicates tee joint heater arrangement schematic diagram, Fig. 2 (b) indicates bend pipe heater arrangement
Heater described in schematic diagram can be the second insulating layer and the second heating layer composition.Second heating layer can be rope type heating
Device.During heating, shown rope type heater must be close to carbon steel pipe in wrapping, and the width of wrapping can be weld width
6 times or more, and width cannot be less than 120mm, the advantages of this arrangement are as follows weld seam, heat-treatment zone and base material can be made
It is heat-treated simultaneously, has good effect to entire property of welded joint is improved.Second insulating layer can be heat preservation
Cotton.The width of the heat-preservation cotton can be 1 times or more of the rope type heater width, for example, it may be rope type heater
1 times of width.The thickness of heat-preservation cotton can be 42mm~56mm, it is preferred that can be 50mm.In the specific implementation process,
It can be bound in the outside of heat-preservation cotton with iron wire to be reinforced.
In this example, as shown in figure 3, the heater is by third when the carbon steel pipe nominal diameter is less than 100mm
Heating layer and for wrapping up third heating layer third insulating layer composition.The third heating layer can be rope type heater.Together
Sample, during heating, shown rope type heater must be close to carbon steel pipe in wrapping, and the width of wrapping can be weld seam
6 times or more of width, and width cannot be less than 120mm.The third insulating layer can be heat-preservation cotton.The width of the heat-preservation cotton
Degree can be 1 times or more of the rope type heater width, for example, it may be 1 times of rope type heater width.Heat-preservation cotton
Thickness can be 42mm~56mm, it is preferred that can be 48mm.It in the specific implementation process, can be in the outside of heat-preservation cotton
It is bound with iron wire to be reinforced.Since the radius of curvature of minor diameter carbon steel pipe is small, minor diameter carbon steel pipe (such as: threeway)
Weld bond apart from close, can be achieved at the same time to short distance weld bond while heating using the heater of above-mentioned setting, it is easy for installation
Quickly, structure is simple, greatly reduces cost of manufacture.
In this example, when carbon steel pipe outside diameter be greater than or equal to 508mm when, shown thermocouple can be set to two with
On, the angle between every thermocouple is equal, is evenly distributed around carbon steel pipe.Further, the thermocouple of setting is even
Several thermocouples.Because carbon steel pipe outside diameter is bigger, radiate bigger, is heated more uneven, thermocouple is along carbon steel pipe even circumferential
Distribution, this ensures that carbon steel pipe each section is heated evenly and controllably.For example, when carbon steel pipe outside diameter is greater than or equal to 508mm
When, shown thermocouple can be two or four.Centered on the cross section center of circle of carbon steel pipe, the angle phase of every thermocouple
Deng.Further, described shown in carbon steel pipe thermocouple layout drawing such as Fig. 4 (a) when carbon steel pipe outside diameter is greater than or equal to 508mm
Thermocouple can be two, 6 o'clock position of first thermocouple (thermocouple 1) in carbon steel pipe cross section.Second thermocouple
The 2 o'clock position or 10 o'clock position of (thermocouple 2) in carbon steel pipe cross section.
In this example, when carbon steel pipe outside diameter is less than 508mm, on carbon steel pipe cross section, shown thermocouple can be 1
Root.For example, as shown in Fig. 4 (b), the position of the thermocouple can be the 2 o'clock position or 10 o'clock position of carbon steel tube section
It sets.Setting can make in the position in the welding process, thermocouple it is easy to operate.Certainly, the position of thermocouple of the invention
It is without being limited thereto with radical.
More than, for the selected selected according to the standard empirical of those skilled in the art of predetermined heat area.It can be
Empirical value or given value.
Step (2), is heat-treated weld seam.
In this example, as shown in figure 5, intelligent temperature control equipment start, heater start to selected predetermined heat area into
Row heating.First in t1In period, the temperature in predetermined heat area is warming up to T by environment temperature1.Heating rate can be any
Value, such as heating rate can be 210 DEG C/h~240 DEG C/h.t1Period can be confirmed according to heating rate.Temperature
T1It can be 380 DEG C~430 DEG C.For example, it is preferable to, temperature T1It can be 397 DEG C~417 DEG C, it is furthermore preferred that can be 400
℃.It is heated to temperature T1Afterwards, with v1Heating rate heat up, arrive t2Moment is warming up to temperature T2.The heating rate v1≤
200 DEG C/h, it is preferred that the heating rate v1≤ 185 DEG C/h, for example, can be 180 DEG C/h.Temperature T2Can be 600 DEG C~
655 DEG C, it is preferred that can be 620 DEG C~630 DEG C, for example, it may be 625 DEG C.It is heated to temperature T2Afterwards, stop heating, heat preservation
T period (the t in Fig. 53-t2Period).
When the carbon steel pipe pipe thickness is not more than 25mm, the soaking time t can be 0.8h~1.2h.Further
, soaking time can be 0.85h~1.14h.For example, it may be 0.9h.
When the carbon steel pipe pipe thickness is greater than 25mm, the soaking time t can no less than (0.8+ (b-25)/25)
H~(1.2+ (b-25)/25) h, b indicate carbon steel pipe pipe thickness, and unit is millimeter.
For example, soaking time can be 1h when the thickness of pipe wall of carbon steel pipe is less than 25mm.When the wall thickness of carbon steel pipe is greater than
When 25mm, constant temperature time t can at least increase the time of (b-25)/25 hour accordingly.After keeping the temperature the t period, start to carry out cold
But it handles.It can be with v2Cooling velocity cooled down.Cooling velocity v2≤ 260 DEG C/h, it is preferred that v2≤ 240 DEG C/h, for example,
It can be 230 DEG C/h.By t4-t3After period, temperature is cooled to T1, that is, it is cooled to 380 DEG C~430 DEG C.It is then turned off electricity
Source carries out natural cooling under conditions of not removing insulating layer.
More than, in 0~t1In period, heating rate is set as arbitrary value, because temperature reaches T1Before, heating rate
Size is little to carbon atom diffusion.In t1~t2In period, temperature is from T1It is raised to T2, heating rate v1≤200℃/h.Such as
Fruit heating rate is excessive, and carbon atom diffusion time is too short, is unfavorable for carbon atom diffusion and heating rate is excessive will cause from carbon
Steel pipe seam outer surface generates Thermal Stress Field to inner surface excessive temperature differentials, aggravates stress concentration phenomenon.In t2~t3Period
It is interior, holding temperature T2, the thickness of carbon steel pipe is thicker, and soaking time should be configured by above-mentioned formula, can guarantee carbon in this way
Outer surface of steel tube is heated more sufficiently and uniform to inner surface, is conducive to carbon atom and sufficiently spreads, grain size and ingredient are more
Uniformly.In t3~t4In period, temperature is from T2Drop to T1, cooling rate v2≤ 260 DEG C/h, because cooling rate is to the group of generation
It knits and has a direct impact with grain size, cooling rate is excessive, and carbon atom diffusion time is too short, is unfavorable for carbon atom diffusion and holds
Brittle tissue (such as martensite, bainite) easily generated, reduces the toughness and plasticity of welding line joint.
Step (3), hardness determination.
In this example, it after heat treatment, needs to carry out hardness determination to weld seam, heat affected area, base material itself.Example
Such as, hardness determination is carried out to the weld seam of 12 o'clock of carbon steel pipe, 3 o'clock and 6 o'clock position, heat affected area and base material respectively.I.e.
On carbon steel tube section, can 12 o'clock to weld seam, 3 o'clock and 6 o'clock position carry out hardness determination, to the zone of influence after heating
12 o'clock, 3 o'clock and 6 o'clock position carry out hardness determination and 12 o'clock, 3 o'clock and 6 o'clock position to main pipe itself
Carry out hardness determination.The highest hardness value of each test point after above-mentioned detection should be not more than 210 Brinell hardness, average hardness value
200 Brinell hardness should be not more than.Preferably, the highest hardness value of each test point should be not more than 195 Brinell hardness (HBW),
Average hardness value should be not more than 189 Brinell hardness.It, can 12 o'clock to weld seam, 9 points likewise, on carbon steel tube section
Clock and 6 o'clock position carry out hardness determination, and 12 o'clock, 9 o'clock and 6 o'clock position to the zone of influence after heating carry out hardness determination
And hardness determination is carried out to 12 o'clock, 9 o'clock and 6 o'clock position of main pipe itself.Above-mentioned detection position is set, respectively generation
Table downhand welding, vertical position welding, overhead welding, and these three position welding parameters (electric current, voltage, heat input etc.) are different from so that this three
A position grain structure form and difference in size are very big, thus to three positions carry out hardness determinations can than more complete understanding of
The hardness situation of entire welding line joint.
Generally, as shown in fig. 6, mainly including weld bond to field acidic environment carbon steel pipe stress-removal construction operation method
Inspection, equipment and instrument testing, heat treatment connecting line, galvanic couple arrangement, heating and heat preservation, slow cooling, hardness determination, ultrasonic wave inspection
It surveys, completes heat treatment.Be heat-treated continuously after weld bond is examined and equipment, instrument testing are qualified, start after the completion of line
The arrangement of thermocouple and heater is carried out, arrangement is heated and is kept the temperature after completing, then slow cooling (i.e. above-mentioned steps (2)),
It finally carries out hardness determination and is carried out non-destructive testing using ultrasonic wave, complete carbon steel pipe heat treatment.
In conclusion field acidic environment carbon steel pipe stress-removal construction operation method effective solution of the invention weld seam
Local residual stress concentrations lead to the problem of the anti-brittle failure ability difference of welding point；In effective solution welding point weld seam and
There are hard and crisp tissues for heat affected area, lead to the problem of welding point resistance to corrosion difference；Dissociate in effective solution weld seam
The presence of hydrogen leads to the problem of weld seam resistance to corrosion difference, has a good application prospect.
Although those skilled in the art should be clear above by combining exemplary embodiment to describe the present invention
Chu can carry out exemplary embodiment of the present invention each without departing from the spirit and scope defined by the claims
Kind modifications and changes.
Claims (10)
1. a kind of field acidic environment carbon steel pipe stress-removal construction operation method, which is characterized in that the method includes following steps
It is rapid:
Predetermined heat area is selected around weld seam, and arranges heater and thermocouple in predetermined heat area；
Predetermined heat area is heated using the heater, thermocouple detects temperature to after 380 DEG C~430 DEG C, with little
Predetermined heat area is heated to 600 DEG C~655 DEG C in the heating speed of 200 DEG C/h, after keeping the temperature the t period, to be not more than 260
DEG C/cooling velocity of h is cooled to 380 DEG C~430 DEG C, it is cooled to room temperature, wherein
When the carbon steel pipe pipe thickness is not more than 25mm, the soaking time t is 0.8h~1.2h；
When the carbon steel pipe pipe thickness is greater than 25mm, the soaking time t is at least (0.8+ (b-25)/25) h~(1.2+
(b-25)/25) h, b indicate carbon steel pipe pipe thickness, and unit is millimeter；
Hardness determination is carried out to the zone of influence after weld seam, heating and main pipe respectively, completes ultrasonic inspection, is realized to field acidity
Environment carbon steel pipe stress-removal construction operation.
2. field acidic environment carbon steel pipe stress-removal construction operation method according to claim 1, which is characterized in that
When the carbon steel pipe nominal diameter is greater than or equal to 100mm, carbon steel pipe straight tube is heated, the heater is by the first half
Arc sections and the second semicircle arc portion composition, the first semicircle arc portion and the second semicircle arc portion can enclose carbon steel pipe to add to it
Heat, the first semicircle arc portion and the second semicircle arc portion are heated by the first insulating layer of outer layer and first on the inside of outer layer
Layer composition；Carbon steel pipe bend pipe and threeway are heated, the heater is by the second heating layer and for wrapping up the second heating layer
Two insulating layers composition, second heating layer are rope type heater；
When the carbon steel pipe nominal diameter is less than 100mm, the heater is heated by third heating layer and for wrapping up third
The third insulating layer composition of layer, the third heating layer are rope type heater.
3. field acidic environment carbon steel pipe stress-removal construction operation method according to claim 2, which is characterized in that described
First insulating layer with a thickness of 42mm~56mm, along carbon steel pipe pipe shaft axial direction, the width of the first insulating layer either side
Width more ipsilateral than first heating layer is 100mm or more wide.
4. field acidic environment carbon steel pipe stress-removal construction operation method according to claim 2, which is characterized in that along carbon
Steel pipe pipe shaft axial direction, second heating layer and third heating layer width are 6 times or more of weld width and width is not small
In 120mm, second insulating layer is 1 times or more of the second heating layer width, and the third insulating layer is the third
1 times or more of heating layer width.
5. field acidic environment carbon steel pipe stress-removal construction operation method according to claim 1, which is characterized in that work as institute
When stating carbon steel pipe outside diameter more than or equal to 508mm, thermocouple arranges 2 or more even number roots, is circle with carbon steel pipe kernel of section
The angle of the heart, every thermocouple is equal；
When the carbon steel pipe outside diameter is less than 508mm, thermocouple arranges 2 or less.
6. field acidic environment carbon steel pipe stress-removal construction operation method according to claim 1 or 5, which is characterized in that
When the carbon steel pipe outside diameter is greater than or equal to 508mm, thermocouple arranges 2, and first, which is located at the carbon steel pipe with thermocouple, cuts
6 o'clock of face position, second thermocouple be located at 2 o'clock of carbon steel tube section position or 10 o'clock position；
When the carbon steel pipe outside diameter is less than 508mm, thermocouple arranges 1, and the thermocouple is located at 2 points of the carbon steel tube section
Clock or 10 o'clock position.
7. field acidic environment carbon steel pipe stress-removal construction operation method according to claim 1, which is characterized in that respectively
Carrying out hardness determination to the zone of influence after weld seam, heating and main pipe includes that butt welding respectively is sewn on 12 o'clock of carbon steel tube section, 3 o'clock
With 6 o'clock position, the zone of influence is cut in 12 o'clock of carbon steel tube section, 3 o'clock and 6 o'clock position and main pipe in carbon steel pipe after heating
12 o'clock of face, 3 o'clock and 6 o'clock position carry out hardness determination, and the highest hardness value after each test point detection is not more than 210 Bu Shi
Hardness, average value are not more than 200 Brinell hardness.
8. field acidic environment carbon steel pipe stress-removal construction operation method according to claim 1, which is characterized in that respectively
Carrying out hardness determination to the zone of influence after weld seam, heating and main pipe includes that butt welding respectively is sewn on 12 o'clock of carbon steel tube section, 9 o'clock
With 6 o'clock position, the zone of influence is cut in 12 o'clock of carbon steel tube section, 9 o'clock and 6 o'clock position and main pipe in carbon steel pipe after heating
12 o'clock of face, 9 o'clock and 6 o'clock position carry out hardness determination, and the highest hardness value after each test point detection is not more than 210 Bu Shi
Hardness, average value are not more than 200 Brinell hardness.
9. according to right to go 1 described in field acidic environment carbon steel pipe stress-removal construction operation method, which is characterized in that it is described
It carries out heating to heating zone to heat using intelligent temperature control equipment control heater, the intelligent temperature control equipment includes distribution
Cabinet, intelligent temperature control unit and output unit, the power distribution cabinet is connect by intelligent temperature control unit with the output unit, described
Output unit includes heating power supply conducting wire and compensating wire, and the heating power supply conducting wire is connect with the heater, for being to add
Hot device provides power supply, and the compensating wire is connect with the thermocouple.
10. field acidic environment carbon steel pipe stress-removal construction operation method according to claim 9, which is characterized in that institute
Stating intelligent temperature control equipment to 2 or more weld bonds while can carry out stress-removal construction operation simultaneously.
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