CN109530849A - A kind of acidic environment carbon steel piping welding procedure method - Google Patents

A kind of acidic environment carbon steel piping welding procedure method Download PDF

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Publication number
CN109530849A
CN109530849A CN201811438028.8A CN201811438028A CN109530849A CN 109530849 A CN109530849 A CN 109530849A CN 201811438028 A CN201811438028 A CN 201811438028A CN 109530849 A CN109530849 A CN 109530849A
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China
Prior art keywords
carbon steel
welding
weld
steel piping
acidic environment
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CN201811438028.8A
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Inventor
张城
李阳
余尚林
李翔
杜和
杨燕
张圆
肖景安
黄勇
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SICHUAN PETROLEUM CONSTRUCTION ENGINEERING Co Ltd
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SICHUAN PETROLEUM CONSTRUCTION ENGINEERING Co Ltd
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Priority to CN201811438028.8A priority Critical patent/CN109530849A/en
Publication of CN109530849A publication Critical patent/CN109530849A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/0026Arc welding or cutting specially adapted for particular articles or work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00Arc welding or cutting
    • B23K9/235Preliminary treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00Making specific metal objects by operations not covered by a single other subclass or a group in this subclass

Abstract

The present invention provides a kind of acidic environment carbon steel piping welding procedure method, the welding procedure method carries out retaining wall on slope to carbon steel pipe the following steps are included: control carbon steel piping ingredient;Carbon steel pipe after retaining wall on slope is grouped, and carbon steel pipe weld bond region of the group to after is preheated;Root bead is carried out to the weld bond region after preheating using the first wlding;Hot weld, filling weldering and cosmetic welding are carried out to the weld bond region after preheating using the second wlding;It carries out non-destructive testing and post weld heat treatment, completion carbon steel piping welds.It is able to solve Weld Performance intensity height, hardness height after acid carbon steel piping welds according to the method for the present invention, causes weld seam easily due to SSC sensitivity the problem of corrosion cracking;It is able to solve after the welding of acid carbon steel piping that S, P, O content are higher in seam organization, generates oxide, sulfide etc. and be mingled with the problem of seriously affecting weld seam degree of purity, welding seam toughness is caused to decline.

Description

A kind of acidic environment carbon steel piping welding procedure method
Technical field
The invention belongs to welding technology fields, more particularly, are related to a kind of acidic environment carbon steel piping welding procedure side Method.
Background technique
In petroleum, chemical industry, the process units of sulfide hydrogen medium is handled, mostly uses carbon steel equipment greatly, however, Carbon steel equipment is easy the corrosion by hydrogen sulfide and is destroyed, and will lead to the case where overhauling of being forced to stop production, to production ten It is unfavorable to divide.All the time, all ununified technology of the method welded for petroleum gas acidic environment carbon steel piping is wanted It asks, the domestic CROSS REFERENCE that also mature sulfur resistive carbon steel piping does not weld.
Therefore, need it is a kind of from the requirement for meeting acidic environment weld seam corrosion resistance and physicochemical property, by tight Lattice control the key links such as welding material, welding craft and after-heat treatment, so that carbon steel welding quality obtains under acidic environment Guarantee, to better meet the exploitation and pipe-line construction requirement of petroleum gas acid gas field, improve pipeline service life, Reduce the welding method of maintenance, repair cost.
Summary of the invention
For the deficiencies in the prior art, it is an object of the present invention to solve above-mentioned exist in the prior art One or more problems.For example, it is an object of the present invention to solve Weld Performance intensity after acid carbon steel piping welds High, hardness height causes weld seam easily due to SSC sensitivity the problem of corrosion cracking;Solve after acid carbon steel piping welding in weld seam because Hydrogen blister, the problem of causing weld seam hydrogen embrittlement and lead to hydrogen induced cracking (HIC);It solves after acid carbon steel piping welds because of stress raisers Or residual stress concentrations and generate local tensile stress, induce sulfide-stress cracking under the effect of sulfide hydrogen medium Problem;S, P, O content are higher in seam organization after the acid carbon steel piping welding of solution, generate oxide, sulfide etc. and are mingled with The problem of seriously affecting weld seam degree of purity, welding seam toughness caused to decline.
Of the invention provides a kind of acidic environment carbon steel piping welding procedure method, the chemical component of the carbon steel pipe It can be by mass percentage are as follows: C≤0.16%, Si≤0.45%, Mn≤1.65%, P≤0.02%, S≤0.008%, Cu ≤ 0.35%, Ni≤0.30%, Cr≤0.30%, Mo≤0.15%, V≤0.07%, Nb≤0.05%, Al≤0.060%, Ti ≤ 0.04%, B≤0.0005%, Ca≤0.006%, N≤0.012%, remaining is Fe and inevitable impurity;It is described Welding procedure method may comprise steps of: control carbon steel piping ingredient carries out retaining wall on slope to carbon steel pipe;To groove plus Carbon steel pipe after work is grouped, and preheats to carbon steel pipe weld bond region of the group to after;Using the first wlding to preheating after Weld bond region carry out root bead;Hot weld, filling weldering and cosmetic welding are carried out to the weld bond region after preheating using the second wlding;Into Row non-destructive testing and post weld heat treatment complete carbon steel piping welding, wherein the deposited metal composition of first wlding It by mass percentage include: C:0.06%~0.15%, Mn≤1.35%, Si:0.45%~0.75%, S≤0.008%, P≤0.020%, Cr≤0.15%, Ni≤0.15%, Cu≤0.50%;The deposited metal composition of second wlding is pressed Mass percentage includes: C≤0.15%, Mn≤1.35%, Si≤0.90%, S≤0.005%, P≤0.020%, and Cr≤ 0.20%, Ni≤0.30%, Mo≤0.30%, V≤0.080%.
In an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention, described first The yield strength of wlding can be 400MPa~484MPa, and tensile strength can be 480MPa~570MPa;Second wlding Yield strength can be 360MPa~460MPa, tensile strength can be 450MPa~550MPa.
In an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention, the postwelding Heat treatment may include being warming up to 610~640 after being warming up to 380 DEG C~430 DEG C with the heating rate no more than 200 DEG C/h DEG C, after keeping the temperature the t period, 380 DEG C~430 DEG C are cooled to the cooling rate no more than 260 DEG C/h, is cooled to room temperature, In, when the carbon steel piping pipe thickness is not more than 25mm, the soaking time t is 0.8h~1.2h;When the carbon steel pipe When road 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, unit is millimeter.
In an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention, the groove It can be double V-groove, the root face of the groove can be 0.5mm~1.5mm, and bevel angle can be 60 °~70 °, between root Gap can be 2.5mm~3.5mm.
In an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention, the preheating Temperature can be 100 DEG C~150 DEG C, the width of preheating can be each 90mm~110mm in weld seam two sides.
In an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention, the root bead Argon arc welding up hill welding can be used, the flow of protective gas can be 10L/min~15L/min.
In an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention, the hot weld Welding electrode arc welding can be used, weld interpass temperature can be 100 DEG C~200 DEG C, the weldering between the root bead and the hot weld 10min can be no more than by connecing interval time;
In an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention, the filling Weldering can be connect using welding rod arc up hill welding, and weld interpass temperature can be 100 DEG C~200 DEG C.
In an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention, the capping Welding can be connect using welding rod arc up hill welding.
It is described lossless in an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention Detection time started and being spaced for welding deadline are greater than for 24 hours.
Compared with prior art, the beneficial effect comprise that being able to solve weld seam after acid carbon steel piping welding Energy intensity is high, hardness is high, causes weld seam easily due to SSC sensitivity the problem of corrosion cracking;It is able to solve acid carbon steel piping welding Afterwards because of hydrogen blister in weld seam, the problem of causing weld seam hydrogen embrittlement and lead to hydrogen induced cracking (HIC);After being able to solve acid carbon steel piping welding Local tensile stress is generated because of stress raisers or residual stress concentrations, induces sulfide under the effect of sulfide hydrogen medium The problem of stress corrosion cracking;It is able to solve after the welding of acid carbon steel piping that S, P, O content are higher in seam organization, generates oxygen Compound, sulfide etc. are mingled with the problem of seriously affecting weld seam degree of purity, welding seam toughness is caused to decline.
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 It is clear, in which:
Fig. 1 shows the stream of an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention Journey schematic diagram.
Fig. 2 shows the welderings of an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention Connect groove schematic diagram.
Fig. 3 shows the heat of an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention Treatment process curve synoptic diagram.
Specific embodiment
Hereinafter, acidic environment carbon steel according to the present invention will be described in detail in conjunction with attached drawing and exemplary embodiment Pipeline welding method.
Fig. 1 shows the stream of an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention Journey schematic diagram.Fig. 2 shows the welderings of an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention Connect groove schematic diagram.Fig. 3 shows an exemplary embodiment of acidic environment carbon steel piping welding procedure method of the invention Heat treatment cycle curve schematic diagram.
The present invention provides a kind of acidic environment carbon steel piping welding procedure methods, in acidic environment carbon steel of the invention In one exemplary embodiment of pipeline welding method, as shown in Figure 1, the welding procedure method may include:
Step S01 controls carbon steel piping ingredient, carries out retaining wall on slope to carbon steel pipe.
In order to improve the ability in acidic environment medium carbon steel hydrogen sulfide corrosion resistant, pipeline service life is improved, dimension is reduced Shield, then need to control the chemical component of carbon steel pipe.The chemical component of the carbon steel pipe by mass percentage can be with are as follows: and C≤ 0.16%, Si≤0.45%, Mn≤1.65%, P≤0.02%, S≤0.008%, Cu≤0.35%, Ni≤0.30%, Cr≤ 0.30%, Mo≤0.15%, V≤0.07%, Nb≤0.05%, Al≤0.060%, Ti≤0.04%, B≤0.0005%, Ca ≤ 0.006%, N≤0.012%, remaining is Fe and inevitable impurity.Further, the carbon steel pipe chemistry at It point by mass percentage can be with are as follows: C≤0.14%, Si≤0.43%, Mn≤1.59%, P≤0.015%, S≤ 0.008%, Cu≤0.32%, Ni≤0.30%, Cr≤0.30%, Mo≤0.15%, V≤0.07%, Nb≤0.05%, Al ≤ 0.060%, Ti≤0.03%, B≤0.0005%, Ca≤0.006%, N≤0.012%, remaining is Fe and inevitable Impurity.
The microscopic metallographic structure of the carbon steel piping is the pearlite and ferrite of small grains.In order to improve acid pipe Road weld seam hydrogen sulfide corrosion resistant ability needs to control wlding with good welds, control weld strength, mechanical property and change It studies and point matches with carbon steel piping, the content of S, P, O in wlding are controlled, to improve weld seam degree of purity, so that it is tough to improve weld seam Property and plasticity, improve weld seam sulfur resistive resistant to hydrogen corrosion cracking ability.
In the present embodiment, as shown in Fig. 2, the groove can be double V-groove.The root face a of the groove can be 0.5~1.5mm, further, root face can be 0.75~1.25mm.Bevel angle β can be 60 °~70 °, further, Bevel angle can be 62 °~68 °.Root gap b can be 2.5~3.5mm, and further, root gap can be 2.75 ~3.25mm.Be arranged above-mentioned root face be advantageous in that can either prevent in root bead occur burn phenomenon, be also avoided that root bead not Through welding.If it is less than the lower limit that it is arranged, root bead is likely to occur burning phenomenon, very may be used if it is greater than its upper limit value being arranged Lack of penetration phenomenon can occur.Above-mentioned bevel angle, which is arranged, to be advantageous in that, both can guarantee that weld seam penetrates, has been increased intensity, has reduced Defective workmanship, and can control deposited metal dosage and dilution rate and the accessibility of guarantee welding gun welding to base material.If low In the lower limit value that bevel angle is arranged in it, not only welding gun can not reach root and carry out welding, but also increase deposited metal dilution Rate and it is easy to produce defective workmanship;If being higher than its upper limit value, increases the loading of deposited metal and make increased costs.
The carbon steel pipe after retaining wall on slope is grouped in step S02, and carries out to carbon steel pipe weld bond region of the group to after Preheating.
In the present embodiment, the temperature of the preheating can be 100 DEG C~150 DEG C, and further, the temperature of preheating can Think 115 DEG C~135 DEG C.Weld preheating for temperature of the present invention is arranged is advantageous in that pre- thermal energy slows down the cooling speed of postwelding Degree is conducive to diffusible hydrogen in weld seam and overflows, and avoids generating hydrogen induced cracking, moreover it is possible to prevent weld dimensions from generating hardened structure And brittle failure.It is unobvious to the further welding point effect that improves if exceeding the temperature range of above-mentioned setting, not only can instead It causes Seam and heat effected zone metal grain coarse, or even generates Widmannstatten structure, also will cause greatly increasing for heating cost, Decline its economic benefit.The preheating should should prevent hot-spot in weld bond two sides and circumferential uniformly progress.The width of preheating Degree can be each 90mm~110mm in weld seam two sides.Further, the width can be each 100mm in weld seam two sides.It is above-mentioned to set The heat affected areas when range set has covered welding, i.e. weld seam, heat affected area, base material preheat the range and can Meet the requirement that welding point diffusible hydrogen overflows and prevents from generating hardened structure.If improving weldering to further beyond the range Connector effect is unobvious, it is coarse to not only result in Seam and heat effected zone metal grain instead, or even generate Widmannstatten structure, It also will cause greatly increasing for heating cost, decline its economic benefit.During preheating, it can be examined using temperature measurer Survey the temperature of preheating.
Step S03 carries out root bead to the weld bond region after preheating using the first wlding.
In the present embodiment, keeping preheating temperature is 100 DEG C~150 DEG C, the first wlding can be used, using argon arc welding Up hill welding carries out root bead.The flow of protective gas when root bead can be 10L/min~15L/min.Under certain condition, gas Body flow and nozzle diameter have an optimum range, and gas shield effect is best at this time, and effective protection region is maximum, above-mentioned to set It is strong that the range of flow set not only can guarantee that air-flow stiffness excludes well surrounding air ability, and avoid generate turbulent flow make air It is involved in, reduces protecting effect.If flow is too low, the bad exclusion surrounding air ability of air-flow stiffness is poor;Flow is excessively high, can produce Raw turbulent flow, which is involved in air, reduces protecting effect.The protective gas can be argon gas (99.99%), and certainly, the present invention uses Protective gas it is without being limited thereto.When the present invention carries out root bead, multistage welding should be divided into, and be symmetrically and evenly distributed, to reduce weldering Scoop out power.
The deposited metal composition of first wlding includes: C:0.06%~0.15% by mass percentage, Mn≤1.35%, Si:0.45%~0.75%, S≤0.008%, P≤0.020%, Cr≤0.15%, Ni≤0.15%, Cu ≤ 0.50%, remaining is iron and inevitable impurity.Further, the deposited metal composition of first wlding It by mass percentage include: C:0.06%~0.12%, Mn≤1.30%, Si:0.45%~0.69%, S≤0.005%, P ≤ 0.014%, Cr≤0.15%, Ni≤0.15%, Cu≤0.50%.
The yield strength of first wlding can be 400MPa~484MPa, tensile strength can for 480 MPa~ 570MPa.Further, the yield strength of the first wlding can be 421~463MPa, tensile strength can for 502~ 548MPa.First wlding is mainly used for root bead, using above-mentioned wlding than strength of parent more slightly higher grade, can be avoided Weld seam is very fragile when carrying out root weld is easy to generate stress because of external action or even the hidden danger that cracks, the meeting under acidic environment Increase weld corrosion cracking risk.If the yield strength and tensile strength of not up to above-mentioned setting, can make the plasticity of weld seam tough Property decline by a relatively large margin, considerably increase weld seam generated under acidic environment hydrogen induced cracking (HIC) and sulfide cracking risk.
In the present embodiment, during root bead, root bead joint can be polished gentle shape, to guarantee that weld seam is carried on the back Face molding is good.
Step S04 carries out hot weld, filling weldering and cosmetic welding to the weld bond region after preheating using the second wlding.
In the present embodiment, hot weld is carried out using the second wlding butt welding mouth and filling is welded.The deposition gold of second wlding Belong to chemical component includes: C≤0.15%, Mn≤1.35%, Si≤0.90% by mass percentage, and S≤0.005%, P≤ 0.020%, Cr≤0.20%, Ni≤0.30%, Mo≤0.30%, V≤0.080%, remaining for iron and inevitably it is miscellaneous Matter.Further, the deposited metal composition of second wlding includes: C≤0.13% by mass percentage, and Mn≤ 1.32%, Si≤0.88%, S≤0.005%, P≤0.015%, Cr≤0.20%, Ni≤0.29%, Mo≤0.30%, V≤ 0.080%.
The yield strength of second wlding is 360MPa~460MPa, and tensile strength is 450MPa~550MPa.Into one Step, the yield strength of second wlding can be 367MPa~445MPa, tensile strength can for 456MPa~ 538MPa.Above-mentioned second wlding intensity, which is arranged, to be advantageous in that, meets and base material equal strength matches, be conducive to increase weldering in this way Plasticity and toughness are stitched, to improve the performance of weld seam resistance against hydrogen cracking and resisting sulfide cracking under acidic environment.If exceeded The range of above-mentioned setting, may cause the plasticity toughness decline of weld seam, open to reduce weld seam resistant to hydrogen cause under acidic environment Split the performance with resisting sulfide cracking.
In the present embodiment, should start to carry out hot weld as early as possible after the completion of root bead.For example, root bead and heat weldable time interval No more than 10min.The hot weld can use welding electrode arc welding, and interlayer temperature can be 100 DEG C~200 DEG C, can be with infrared Line temperature measurer detects interlayer temperature.
More than, the control of butt welding mouth preheating temperature and interlayer temperature can prevent the shape of heat affected area high rigidity microscopic structure At the plasticity and toughness of weld seam being improved, to increase the ability of its hydrogen sulfide corrosion resistant.
In the present embodiment, filling weldering can be connect using welding rod arc up hill welding.Interlayer temperature when welding can control It is 100 DEG C~200 DEG C.Interlayer temperature is controlled in above range, is equal to one layer of welding bead and is played preheating to next layer of welding bead Effect not only contributes to diffusible hydrogen spilling, reduces cooling velocity and avoids generating hardened structure, and is prevented again because temperature is excessively high Keep Seam and heat effected zone metal grain coarse, or even generates Widmannstatten structure.Lower than the lower range limit, weld seam is easy to produce Temperature internal stress, while cooling velocity increases, and is also easy to produce hardened structure;Higher than the range higher limit, Seam and heat effected zone gold Belong to coarse grains, or even generates Widmannstatten structure.
In the present embodiment, when pipeline wall thickness is thicker, the filling weldering can swing welding using multiple tracks, to ensure Molten bath can be effectively protected, and good knitting is answered in groove two sides.
In the present embodiment, when discovery second wlding is rubescent or inclined arc, welding rod should be replaced immediately.
In the present embodiment, the cosmetic welding can be connect using welding rod arc up hill welding.Filling weldering deadline and capping Weldering interval time time started does not have specific requirement, and meeting interlayer temperature is 100 DEG C~200 DEG C.
In the present embodiment, when groove is wider, for example, the cosmetic welding can be using row when width is more than 14mm Weldering, and rear one of weld seam will at least cover the 1/3 of preceding one of weld seam, and should ensure that weld seam and base material rounding off, to the greatest extent may be used Energy ground, which reduces welding stress concentration, will at least cover the 1/3 of preceding one of weld seam, can not only be conducive to stomata etc. in preceding one of weld seam Defect detaches, moreover it is possible to play the role of heat treatment to it, to improve the plasticity and toughness of weld seam.If cannot cover The 1/3 of preceding one of weld seam, then the defects of cannot making stomata in preceding one of weld seam, detach, and the effect being heat-treated to it is not yet Obviously.After the completion of cosmetic welding, can using wire brush remove weld seam slag and weld seam two sides splash, and with weld dipping Check weld appearance quality, if there is excessive defect, timely repairing treatment.
Step S05, carries out non-destructive testing weld seam.
In the present embodiment, consider and arrive weld seam delayed crack, after welding completion for 24 hours, weld seam can be carried out non-destructive testing, institute 100%RT and 100%UT can be used by stating non-destructive testing.
In the present embodiment, root bead must not in undercut, ray detection should carry out interior undercut judgement.
In the present embodiment, detection method can use ray detection and ultrasound examination simultaneously.It is examined simultaneously using ray It surveys and ultrasound examination is in order to detect all kinds of defects such as the three peacekeeping two dimensions generated in weld seam to greatest extent, thus as far as possible Ground avoids the ability that weld seam anti-H 2 S is reduced because of the missing inspection of defect.
Step S06, is heat-treated weld seam.
In the present embodiment, can 3 times of weld width regions each to weld seam and its two sides be heat-treated.Heat treatment Effect is in order to reduce welding line joint residual stress and increase plastic property of weld bead toughness, to improve weld seam hydrogen sulfide corrosion resistant energy Power.As shown in figure 3, first in t1In period, temperature is warming up to T by environment temperature1, T1It can be 380 DEG C~430 DEG C, into One step can be 386 DEG C~420 DEG C, such as 400 DEG C.Heating rate can any value, such as heating rate can be 210 DEG C/h~240 DEG C/h.t1Period can be confirmed according to heating rate.It is heated to temperature T1Afterwards, with v1Heating speed Degree heats up, and arrives t2Moment is warming up to temperature T2.The heating rate v1≤ 200 DEG C/h, further, the heating speed Spend v1≤ 185 DEG C/h, for example, can be 180 DEG C/h.Temperature T2It can be 610 DEG C~640 DEG C, further, can be 620 DEG C~630 DEG C, for example, it may be 625 DEG C.It is heated to temperature T2Afterwards, stop heating, keep the temperature the t period (t in Fig. 33-t2When Between section).After keeping the temperature the t period, start to carry out cooling treatment.It can be with v2Cooling velocity cooled down.Cooling velocity v2≤ 260 DEG C/h, further, v2≤ 240 DEG C/h, for example, it may 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 then cools to room temperature.
Wherein, when the carbon steel piping pipe thickness be not more than 25mm when, the soaking time t can for 0.8h~ 1.2h.Further, soaking time can be 0.85h~1.14h.For example, it may be 0.9h.When the carbon steel piping tube wall When thickness is greater than 25mm, the soaking time t can be no less than (0.8+ (b-25)/25) h~(1.2+ (b-25)/25) h, b table Show that carbon steel pipe pipe thickness, unit are millimeter.
More than, the holding temperature that heat treatment is arranged, which is 610 DEG C~640 DEG C, to be advantageous in that, which belongs to high temperature and return Fire can obtain tempered sorbite, as ferrite+fine grained cementite mixture, can not only reduce weld seam residualinternal stress, And plastic property of weld bead and toughness can also be improved.If exceeding above range, it may occur that tissue and phase transformation, to change weldering The mechanical property of seam.Further, holding temperature can be 620~630 DEG C, and further, holding temperature can be 625 ℃。
For general diameter carbon steel pipe of the invention, soaking time can be 50~70min.Above-mentioned heat preservation is set Time can not only make carbon atom uniformly diffuse to form statenchyma phase, and can also prevent coarse grains.If soaking time Too short, carbon atom cannot effectively be spread, and it is also uneven to form tissue;Time is too long, and grain structure may be made coarse.Into One step, soaking time can be 55~65min, and further, soaking time can be 60min.
Heat treatment is to be warming up to 380 DEG C~430 DEG C heating rates below unlimited, because the temperature following temperature is to carbon Atomic diffusion rates influence is smaller, so the tissue effect to formation is also little.380 DEG C~430 DEG C or more of heating rate can Think less than 200 DEG C/h, for example, can be 50 DEG C/h~150 DEG C/h.Above-mentioned heating rate is set and is conducive to carbon atom diffusion More sufficiently, keep grain structure ingredient more uniform, and reduce the defect of grain structure, residual stress is reduced, to improve weldering The plasticity and toughness of seam.If temperature rising is too fast, carbon atom diffusion is insufficient in crystal grain, will cause structural constituent so not Uniformly, cannot achieve reduces weld stress effect, so that the plasticity of weld seam and toughness cannot be made to improve.In temperature-fall period, 380 DEG C~430 DEG C or more of cooling rate can be less than 260 DEG C/h, for example, can be 65 DEG C/h~195 DEG C/h.Setting Above-mentioned cooling rate is advantageous in that, is conducive to generate the ferrite and pearlite tissue with preferable plasticity and toughness, be improved The resistance to corrosion of weld seam.If cooling velocity is too fast, it has been even more than metal critical cooling velocity, hardness may be generated With the biggish martensitic structure of brittleness, this can be such that weld metal acid-resisting corrosive power substantially reduces.For 380 DEG C~430 DEG C Cooling rate below is unlimited, because 380 DEG C~430 DEG C or less cooling rates are to carbon atom diffusion and tissue morphology and answer Power influence is smaller, is conducive to control construction cost so not controlling its cooling rate, increase economic efficiency.
In the present embodiment, the heat treatment can use crawler type or rope type electric heating, for example, Equipment for Heating Processing type Number can be WDK-FS-612060T, the type Equipment for Heating Processing belong to automatically control select programmable input mode control Equipment, temperature control and heating power supply input use intelligent temperature control device, after inputting heat treatment process parameter, at entire heat Reason process is automatically performed by the parameter of input, and heat treatment temperature data and the printable output of curve, can effectively guarantee heat The accuracy of processing.
In conclusion can make welding point in HIC the and SSC performance detection of standard solution by means of the present invention In hydrogen induced cracking (HIC) (HIC) test, crack length rate average value, crack thickness rate average value and crack-sensitivity rate average value are equal Meet standard and design requirement;It can make welding point in sulfide stress cracking (SSC) (SSC) test, test specimen is without any surface Crackle;The anti-corrosion effects of acidic environment carbon steel piping can be made significantly to be improved in production application, Pipeline reduces because of the probability of corrosion leakage;The cost of maintenance and maintenance can be reduced.
Although having been combined attached drawing above and exemplary embodiment describing the present invention, ordinary skill people Member can carry out various repair to above-described embodiment it will be apparent to the skilled artisan that in the case where not departing from spirit and scope of the claims Change.

Claims (10)

1. a kind of acidic environment carbon steel piping welding procedure method, which is characterized in that the chemical component of the carbon steel pipe presses quality Percentage is calculated as: C≤0.16%, Si≤0.45%, Mn≤1.65%, P≤0.02%, S≤0.008%, Cu≤0.35%, Ni ≤ 0.30%, Cr≤0.30%, Mo≤0.15%, V≤0.07%, Nb≤0.05%, Al≤0.060%, Ti≤0.04%, B ≤ 0.0005%, Ca≤0.006%, N≤0.012%, remaining is Fe and inevitable impurity;The welding procedure method The following steps are included:
Carbon steel piping ingredient is controlled, retaining wall on slope is carried out to carbon steel pipe;
Carbon steel pipe after retaining wall on slope is grouped, and carbon steel pipe weld bond region of the group to after is preheated;
Root bead is carried out to the weld bond region after preheating using the first wlding;
Hot weld, filling weldering and cosmetic welding are carried out to the weld bond region after preheating using the second wlding;
It carries out non-destructive testing and post weld heat treatment, completion carbon steel piping welds, wherein the deposited metal chemistry of first wlding Ingredient includes: C:0.06%~0.15%, Mn≤1.35%, Si:0.45%~0.75% by mass percentage, and S≤ 0.008%, P≤0.020%, Cr≤0.15%, Ni≤0.15%, Cu≤0.50%;
The deposited metal composition of second wlding includes: C≤0.15%, Mn≤1.35%, Si by mass percentage ≤ 0.90%, S≤0.005%, P≤0.020%, Cr≤0.20%, Ni≤0.30%, Mo≤0.30%, V≤0.080%.
2. acidic environment carbon steel piping welding procedure method according to claim 1, which is characterized in that first wlding Yield strength be 400MPa~484MPa, tensile strength be 480MPa~570MPa;The yield strength of second wlding is 360MPa~460MPa, tensile strength are 450MPa~550MPa.
3. acidic environment carbon steel piping welding procedure method according to claim 1, which is characterized in that at the postwelding heat Reason includes 610~640 DEG C being warming up to the heating rate no more than 200 DEG C/h, when keeping the temperature t after being warming up to 380 DEG C~430 DEG C Between after section, be cooled to 380 DEG C~430 DEG C with the cooling rate no more than 260 DEG C/h, be cooled to room temperature, wherein
When the carbon steel piping pipe thickness is not more than 25mm, the soaking time t is 0.8h~1.2h;
When the carbon steel piping 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.
4. acidic environment carbon steel piping welding procedure method according to claim 1, which is characterized in that the groove is V Type groove, the root face of the groove are 0.5mm~1.5mm, and bevel angle is 60 °~70 °, root gap be 2.5mm~ 3.5mm。
5. acidic environment carbon steel piping welding procedure method according to claim 1, which is characterized in that the temperature of the preheating Degree is 100 DEG C~150 DEG C, and the width of preheating is each 90mm~110mm in weld seam two sides.
6. acidic environment carbon steel piping welding procedure method according to claim 1, which is characterized in that the root bead uses Argon arc welding up hill welding, the flow of protective gas are 10L/min~15L/min.
7. acidic environment carbon steel piping welding procedure method according to claim 1, which is characterized in that the hot weld uses Welding electrode arc welding, weld interpass temperature are 100 DEG C~200 DEG C, and the weld interval time between the root bead and the hot weld is not More than 10min.
8. acidic environment carbon steel piping welding procedure method according to claim 1, which is characterized in that the filling weldering is adopted It is connect with welding rod arc up hill welding, weld interpass temperature is 100 DEG C~200 DEG C.
9. acidic environment carbon steel piping welding procedure method according to claim 1, which is characterized in that the cover welding It is connect using welding rod arc up hill welding.
10. acidic environment carbon steel piping welding procedure method according to claim 1, which is characterized in that the lossless inspection It surveys the time started and welds the interval of deadline and be greater than for 24 hours.
CN201811438028.8A 2018-11-27 2018-11-27 A kind of acidic environment carbon steel piping welding procedure method Pending CN109530849A (en)

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