CN107813071A - A kind of big wall thickness cryogenic pipelines pipe fitting welding wire for submerged-arc welding of high intensity - Google Patents
A kind of big wall thickness cryogenic pipelines pipe fitting welding wire for submerged-arc welding of high intensity Download PDFInfo
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- CN107813071A CN107813071A CN201610814165.1A CN201610814165A CN107813071A CN 107813071 A CN107813071 A CN 107813071A CN 201610814165 A CN201610814165 A CN 201610814165A CN 107813071 A CN107813071 A CN 107813071A
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- pipe fitting
- wall thickness
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- submerged
- welding wire
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Classifications
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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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of big wall thickness cryogenic pipelines pipe fitting welding wire for submerged-arc welding of high intensity, the chemical component weight percentage of welding wire（%）：C 0.01 ~ 0.08, Si 0.1 ~ 0.3, Mn 1.5 ~ 2.5, S≤0.008, P≤0.01, Ni 2.5 ~ 3.5, Mo 0.3 ~ 1.0, V≤0.01, Cu≤0.45, Cr 0.25 ~ 0.5, Nb≤0.02, Ti≤0.01 ~ 0.05, B≤0.005, surplus are Fe and inevitable impurity.This welding wire matches with the sintered flux that basicity is 1.5 2.5.Monofilament double-submerged arc is carried out to the big wall thickness pipe fitting of high intensity cryogenic pipelines with main pipe to connect, main pipe after welding passes through 950 DEG C ~ 1200 DEG C sensing heatings, and bent under hot, then water quenching, again after 500 DEG C ~ 750 DEG C 1.5 ~ 3.5h of tempering insulation, weld seam obtains optimal combination of strength and toughness, weld seam tensile strength >=660MPa, 60 DEG C of impact value average value Akv >=75J of weld seam, it is adapted to performance requirement of the severe cold areas for the big wall thickness pipe fitting of high intensity.
Description
Technical field
The present invention relates to the big wall thickness cryogenic pipelines pipe fitting submerged arc of a kind of pipe fitting welding wire, especially X80 intensity ranks
Welding wire.
Background technology
It is continuously increased with the demand of world energy sources, Oil And Gas Exploration And Development develops especially extremely low height to outlying district
Cold area, what this caused the conveyance conduit of extremely frigid zones turns focus into.China's construction transfering natural gas from the west to the east, China-Russia Crude Oil Pipeline work
Its minimum operating temperature of journey can reach -45 DEG C, according to pipeline technology design requirement, part yard pipe fitting need it is exposed cold
It is on active service under external environment condition, the low-temperature resistance fragility crack initiation ability for material is an acid test.
Pipe fitting is as an indispensable part in pipe-line construction, and which carry the important function of pipeline connection, Er Qieqi
Pressure-bearing and stressing conditions have particularity, in order to meet safety problem of the petroleum gas in transportation, therefore it is right
It is more harsh in the wall thickness and performance requirement of pipe fitting.And pipe fitting is in the fabrication process, due to its experience bend deformation, water quenching and
After tempering, its original acicular ferrite structure is destroyed, and occurs substantial amounts of upper bainite and island M-A islands tissue in weld seam,
Low-temperature flexibility is caused to deteriorate.
At present such as announcements such as CN 103192198A, CN 103240512A, CN104476009A and CN 102303195A
Hot-bending bends welding wire technology, its wlding are only applicable to welding and manufacture with the hot-bending bends of main pipeline uniform thickness, and for
The index request of low-temperature flexibility is only -45 DEG C, and existing market does not have any on the manufacture of -60 DEG C big wall thickness oil pipeline pipe fitting
Technology relevant report, technique for polar region oil-gas exploration exploit and transport equal energy source strategy there is outstanding meaning,
And market prospects are huge.
The content of the invention
It is an object of the invention to provide a kind of big wall thickness cryogenic pipelines pipe fitting welding wire for submerged-arc welding of high intensity.It is as-welded in guarantee
While intensity and toughness, remain to keep preferably tough matching after Overheating Treatment.
The purpose of the present invention solves by the following technical programs：
A kind of big wall thickness cryogenic pipelines pipe fitting welding wire for submerged-arc welding of high intensity, its composition include by mass percentage（%）：C 0.01~
0.08, Si 0.1 ~ 0.3, Mn 1.5 ~ 2.5, S≤0.008, P≤0.01, Ni 2.5 ~ 3.5, Mo 0.3 ~ 1.0, V≤0.01, Cu
≤ 0.45, Cr 0.25 ~ 0.5, Nb≤0.02, Ti 0.01 ~ 0.05, B≤0.005, surplus are Fe and inevitable impurity.
A kind of big wall thickness cryogenic pipelines pipe fitting welding wire for submerged-arc welding of described high intensity, the side of being cast into after being smelted using circuit
Base, Φ 6.5/5.5mm wire rod is rolled into through high speed twist-free mill, wire rod is through peeling off, pickling, wire drawing, Φ is made after copper facing
3.2mm, Φ 4.0mm or other specifications finished product welding wire.
The hot-bending bends welding wire matches with the sintered flux that basicity is 2.0~2.5, and thickness is managed for 38 ~ 60mm
Part main pipe carries out double-submerged arc and connect, and weld heat input is 20~50kJ/cm.The main pipe welded adds through 950~1200 DEG C of sensings
Heat, and bent under hot, then water quenching, then after 500~750 DEG C are incubated 1.5~3.5 hours, weld metal resists
Tensile strength >=660MPa, -60 DEG C of impact value Akv >=75J of weld seam.
Each element in the chemical composition of the big wall thickness cryogenic pipelines pipe fitting welding wire for submerged-arc welding of high intensity of the design invention
Effect is as follows：
C：An important factor for suitable C content is guarantee weld strength, therefore C content is unsuitable too low.But too high C element deteriorates
Weldability, increase cold crack tendency, can make M-A islands content in reheating seam organization increase the impact flexibility for damaging weld seam.
In view of the modifier treatment of the scaling loss and subsequent weld of C in welding process, the C content in welding wire preferably controls 0.01%~
0.08%。
Si：On the one hand it is the deoxidant element of weld metal, has calm molten bath, increases molten bath mobility to eliminate the work of stomata
With weldability is improved, while it also has stronger solution strengthening effect, can effectively improve the intensity of weld metal.The opposing party
When face, welding and heat treatment, too high Si contents, which can increase granular ferrite content in weld seam, deteriorates welding seam toughness.Therefore,
Si contents in welding wire are controlled 0.1% ~ 0.3%.
Mn：It is effective intensity increase element and deoxidant element in weld seam, is advantageous to refine weld grain, increases needle-like
Ferrite content, while the content of crystal boundary pro-eutectoid ferrite and ferrite side plate is reduced, so as to improve the tough of weld metal
Property.But excessive Mn contents easily in cyrystal boundary segregation, so as to cause the tissues such as retained austenite, martensite to produce, are welded so as to reduce
Stitch the toughness of metal.In order to ensure the combination of strength and toughness of weld seam, in welding wire of the invention the control of Mn constituent contents 1.5%~
2.5%。
Ni：Austenite is solid-solution in, expands γ phase regions, unlimited solid solution is formed, is Strengthening and Toughening constituent element in weld metal；Pipe fitting
Ferritic intensity can be improved by having crystal grain thinning during bending and being dissolved in ferrite, also influence ferrite during low temperature
The structure and then raising plastic deformation ability of dislocation mucleation.But too high Ni contents can reduce the mobility in molten bath, butt welding is seamed into
Shape is unfavorable, the defects of also easily causing weld seam slag inclusion and stomata.To sum up, it is 2.5%~3.5% to control its content.
Mo：It is to effectively facilitate one of element that as-welded weld metal acicular ferrite is formed, is improving the same of weld strength
When also improve the low-temperature impact toughness of weld metal；C and carbide former diffusivity are reduced during heat treatment and is pressed down
The precipitation of carbide processed, improve quenching degree.Phase transition temperature can be also reduced when pipe fitting is bent and the coarsening rate of acicular ferrite is thin
Change crystal grain, while reduce temper brittleness tendency.Therefore it is 0.3%~1.0% to control its content.
Ti：The element is strong deoxidier, denitrifier, and appropriate Ti is combined generation TiN and Ti with N, O2O3As the nuclei of crystallization
The heart, the generation of acicular ferrite in main pipe weld seam is on the one hand promoted, suppress the generation of ferrite side plate and grain boundary ferrite
；On the other hand the Second Phase Particles of these Dispersed precipitates prevent pipe fitting fire bending bend during austenite crystal grow up, have
The intensity and toughness of effect increase weld seam.It is 0.01%~0.05% that Ti contents are controlled in the present invention.
V：It combines to form V CN compounds and oxide with C, N and O, and pinning crystal boundary prevents Austenite Grain Growth, or
Postpone austenite recrystallization, the obdurability of weld metal is improved by precipitation hardening, therefore its optimum content is little
In 0.01%.
Cu：Solution strengthening effect can improve the intensity of weld seam, and in alloying element, Cu confrontation hydrogen induced crackings（HIC）'s
Effect is the most obvious, and Cu can promote the formation of passivating film, reduce the intrusion of hydrogen, so adding a certain amount of Cu makes weld metal
With certain hic resistance performance, but too high levels can increase the red brittleness of weld seam, control its content below 0.45%.
Cr：The content of weld seam acicular ferrite can be improved, to improve weld strength and low-temperature flexibility, Cr is advantageous to carry in addition
The decay resistance of high weld seam.But too high Cr contents can improve brittle transition temperature, therefore, control its content for 0.1~
0.5%。
Nb：Can crystal grain thinning, improve the intensity of weld seam, the generation of ferrite side plate can be promoted in C-Mn systems weld seam,
Deteriorate toughness, but containing Ti, in B weld seam, Nb can promote the generation of the acicular ferrite of fine uniform, improve weld seam
Toughness, therefore the element can be added in right amount, it is≤0.02% to control its content.
B：B is dissolved in austenite grain boundary segregation, reduces crystal boundary energy, is advantageous to suppress the shape of pro-eutectoid ferrite on crystal boundary
Into and roughening.B and Ti is added simultaneously in the case that, Ti strong deoxidation protection solid solution B is not oxidized in process of setting.Separately
Outside, B can spread in the larger welding process of heat input to the coarse grain zone for closing on melt run, help to refine coarse grain zone microstructure,
Improve the toughness of coarse grain zone.It is≤0.005% to control its content.
S、P：It is the impurity element that must strictly limit, lowers lifting and toughness that its content is advantageous to weldability as far as possible
Improve.In the present invention, its content is at least controlled in S≤0.008%, P≤0.01%.
The basicity for matching sintered flux is required in the present invention, is the requirement based on removability of slag energy and appearance of weld,
The influence of oxygen content in weld seam, field trash to mechanical property is considered simultaneously, therefore is by the alkalinity ranges requirement of welding：2.0~
2.5。
Beneficial effects of the present invention：
1. the advantages of welding wire of the present invention is, it is adapted to submerged arc welding and the weld seam heat of the big wall thickness cryogenic pipelines pipe fitting sheet material of high intensity
Processing.Welding wire is designed using Ni-Cr-Mo-V-Ti-B alloy, and the intensity and low temperature of the addition raising weld seam of Ni, Cr element are tough
Property；Mo elements increase the quenching degree and impact flexibility of material, reduce temper brittleness tendency；Ti elements are in larger welding
The formation of pro-eutectoid ferrite and ferrite side plate can be suppressed during heat input, promote the forming core of acicular ferrite, refinement crystalline substance
Grain, improve the intensity and toughness of weld metal；The addition of Nb elements and Ti, B collective effect, can further lift weld metal
Low-temperature flexibility；The addition of Cu elements can improve resistivity of the weld metal to hydrogen induced cracking, reduce the hair of hydrogen induced cracking
Raw probability, promote the low-temperature flexibility of weld metal.In a word, the design of alloying component greatly improves the body of acicular ferrite structure
Product content, so as to improve the low-temperature flexibility of weld metal.
2. the welding wire of the present invention matches with the sintered flux of basicity 2.0 ~ 2.5, welded using double-submerged arc, welding is intact
Fall into, good moldability.
3. the pipe fitting main pipe using welding wire welding passes through 950 DEG C ~ 1200 DEG C sensing heatings, bent under hot, so
Water quenching afterwards, by 500 DEG C ~ 750 DEG C tempering after, tensile strength >=660MPa of weld metal, -60 DEG C of impact values of weld seam >=
75J。
It is that technical scheme is further described with reference to preferred embodiment below.
The manufacture method of the welding wire of the present invention, using square billet is cast into after electric furnace smelting, by telling twist-free mill, rolling
Into φ 6.5mm or φ 5.5mm wire rod, wire rod through peeling off, pickling, wire drawing, copper facing rear support φ 3.2mm, φ 4.0mm or
The welding wire finished product of other specifications.
Embodiment 1
φ 3.2mm welding wire for submerged-arc welding composition is made using the above method（Percentage by weight %）：C 0.05, Si 0.15, Mn
1.82, S 0.005, P 0.008, Ni 2.54, Mo 0.42, V 0.004, Cu 0.40, Cr 0.34, Nb 0.011, Ti
0.025, B 0.003 surplus is Fe and inevitable impurity.
This welding wire is matched with the sintered flux of basicity 2.1, and monofilament double-submerged arc is carried out to the X80 tubing that thickness is 46mm
Connect, welding current is 430A ~ 530A, and voltage is 28 ~ 30V, 40 ~ 50cm/min of speed of welding.The main pipe welded carries out sensing and added
Heat is bent to 1050 DEG C, then carries out water quenching, and 550 DEG C and insulation 2 are heated to the pipe fitting bent is put into heating furnace
Hour, its weld metal tensile strength 674MPa, -60 DEG C of ballistic work average value 112J.
Embodiment 2
φ 3.2mm welding wire for submerged-arc welding compositions are made using the above method（Percentage by weight %）：C 0.07, Mn 1.78, Si 0.15, S
0.006, P 0.007, Ni 3.1, Mo 0.65, V 0.007, Cu 0.32, Cr 0.46, Nb 0.015, Ti 0.032, B
0.004, surplus is Fe and inevitable impurity.
This welding wire is matched with the sintered flux of basicity 2.0, and monofilament double-submerged arc is carried out to the X80 tubing that thickness is 52mm
Connect, welding current is 430A ~ 650A, and voltage is 28 ~ 34V, 40 ~ 50cm/min of speed of welding.The main pipe welded carries out sensing and added
Heat and is bent to 1050 DEG C, then carries out water quenching, is heated to 600 DEG C the pipe fitting bent is put into heating furnace and is incubated
2.5 hours, its weld metal tensile strength 685MPa, -60 DEG C of ballistic work average value 94J.
Embodiment 3
φ 3.2mm welding wire for submerged-arc welding compositions are made using the above method（Percentage by weight %）：C 0.07, Mn 1.94, Si 0.21, S
0.006, P 0.007, Ni 3.4, Mo 0.85, V 0.01, Cu 0.45, Cr 0.47, Nb 0.018, Ti 0.032, B
0.004, surplus is Fe and inevitable impurity.
This welding wire is matched with the sintered flux of basicity 2.0, and monofilament double-submerged arc is carried out to the X80 tubing that thickness is 52mm
Connect, welding current is 430A ~ 650A, and voltage is 28 ~ 34V, 40 ~ 50cm/min of speed of welding.The main pipe welded carries out sensing and added
Heat and is bent to 1050 DEG C, then carries out water quenching, is heated to 650 DEG C the pipe fitting bent is put into heating furnace and is incubated
2.5 hours, its weld metal tensile strength 692MPa, -60 DEG C of ballistic work average value 105J.
By above-described embodiment, welding wire of the present invention, the Weld Performance after welding after Overheating Treatment is processed
Meet technical indicator as defined in X80 pipe fittings, -60 DEG C of low-temperature impact toughness meet polar region extremely frigid zones pipeline requirement.
Claims (5)
1. a kind of big wall thickness cryogenic pipelines pipe fitting welding wire for submerged-arc welding of high intensity, it is characterised in that composition forms by mass percentage
Including（%）：C 0.01 ~ 0.08, Si 0.1 ~ 0.3, Mn 1.5 ~ 2.5, S≤0.008, P≤0.01, Ni 2.5 ~ 3.5, Mo 0.3 ~
1.0, V≤0.01, Cu≤0.45, Cr 0.25 ~ 0.5, Nb≤0.02, Ti≤0.01 ~ 0.05, B≤0.005, surplus is for Fe and not
Evitable impurity.
2. the big wall thickness cryogenic pipelines pipe fitting welding wire for submerged-arc welding of high intensity according to claim 1 is characterized in that, when welding
Basicity of arranging in pairs or groups is 2.0 ~ 2.5 sintered flux, and carrying out monofilament double-submerged arc to its main pipe connects, 20 ~ 50kJ/ of thermal weld stress
cm。
3. the big wall thickness cryogenic pipelines pipe fitting of high intensity according to claim 1 is characterized in that with welding wire for submerged-arc welding：Steel of base metal
36 ~ 60mm of plate thickness.
4. the big wall thickness cryogenic pipelines pipe fitting of high intensity according to claim 1 is welded big with welding wire for submerged-arc welding using the welding wire
The Technology for Heating Processing that bends of the pipe fitting main pipe of wall thickness is：950 ~ 1200 DEG C of sensing heatings, and bent under hot, then water quenching,
Again 1.5 ~ 3.5h is incubated through 500 DEG C ~ 750 DEG C tempering.
5. the big wall thickness cryogenic pipelines pipe fitting of high intensity according to claim 1 ~ 3 is characterized in that by weldering with welding wire for submerged-arc welding
Connect and Technology for Heating Processing after obtained weld metal tensile strength >=660MPa, -60 DEG C of low-temperature impact average value Akv >=75J.
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| CN201610814165.1A CN107813071A (en) | 2016-09-12 | 2016-09-12 | A kind of big wall thickness cryogenic pipelines pipe fitting welding wire for submerged-arc welding of high intensity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610814165.1A CN107813071A (en) | 2016-09-12 | 2016-09-12 | A kind of big wall thickness cryogenic pipelines pipe fitting welding wire for submerged-arc welding of high intensity |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108705223A (en) * | 2018-05-16 | 2018-10-26 | 武汉钢铁有限公司 | A kind of tensile strength is 810MPa grades of high-ductility corrosion Lincoln weld welding wires |
| CN109366034A (en) * | 2018-10-22 | 2019-02-22 | 钢铁研究总院 | A kind of pipe fitting weld seam and preparation method thereof |
| CN109454359A (en) * | 2018-09-17 | 2019-03-12 | 昆山中冶宝钢焊接材料有限公司 | A kind of tensile strength 1000MPa grades of welding wire for submerged-arc welding |
| CN110434507A (en) * | 2019-08-22 | 2019-11-12 | 华南理工大学 | A kind of underwater increasing material reparation metal wire material for ocean engineering |
| CN111618477A (en) * | 2019-02-28 | 2020-09-04 | 宝山钢铁股份有限公司 | High-toughness gas shielded welding wire for ultralow heat input automatic welding and welding method thereof |
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