CN103586569B - A kind of technique reducing X80 pipe line steel Cold Cracking Susceptibility - Google Patents
A kind of technique reducing X80 pipe line steel Cold Cracking Susceptibility Download PDFInfo
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- CN103586569B CN103586569B CN201310523648.2A CN201310523648A CN103586569B CN 103586569 B CN103586569 B CN 103586569B CN 201310523648 A CN201310523648 A CN 201310523648A CN 103586569 B CN103586569 B CN 103586569B
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- welding
- pipe line
- line steel
- steel cold
- cracking susceptibility
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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
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
-
- 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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
- B23K33/006—Filling of continuous seams for cylindrical workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/10—Pipe-lines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Plasma & Fusion (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention relates to pipeline welding technical field, particularly relate to a kind of technique reducing X80 pipe line steel Cold Cracking Susceptibility, comprise preheating, welding and post weld heat treatment step.Adopt higher preheat temperature to slow down the cooling velocity of postwelding, be conducive to the effusion of diffusible hydrogen in weld metal, also reduce the degree of hardening of weld dimensions simultaneously, improve the crack resistance of welding point.Postwelding is heat-treated immediately, and Slow cooling after first high-temperature heating is also incubated, and to eliminate postwelding residual stress, impels the diffusion of residual hydrogen excessive.The cold crack because constraint stress and hardened structure cause can be reduced like this.
Description
Technical field
The present invention relates to pipeline welding technical field, particularly relate to a kind of technique reducing X80 pipe line steel Cold Cracking Susceptibility.
Background technology
Along with the development of petroleum industry, Cemented filling oil gas is safe with it, economical, efficiently develop rapidly, along with the grade of steel increasing pipe line steel of natural gas transport pressure is also along with rising.X80 pipe line steel is in transfering natural gas from the west to the east branch line engineering test phase successful Application on a small scale, and next step plans to use in a large number on Gas Transmission Pipeline Project.X80 is a kind of Ultra-low carbon, microalloy high strength steel, is that a kind of pipe line steel material of function admirable has good application prospect.But because Hi-grade steel pipe line steel has larger difference relative to low Grade Pipeline Steel from Composition Design to structural state, its welding application technology is relatively immature, and the defect wherein the most easily produced is welding cold cracking.The existence of cold crack can cause the destruction of component, and then causes the generation of various accident.The safe operation of pipeline of transferring natural gas from the west to the east is related to economic life line of the country, once have an accident, not only can bring huge loss to national economy, causes extremely serious impact also can to society and ecological environment.Therefore further investigate the formation mechenism of Hi-grade steel pipe line steel cold crack, in welding process, select suitable welding procedure to be an important task in Hi-grade steel pipe line steel welding field to prevent the generation of cold crack.
Summary of the invention
The object of the present invention is to provide a kind of technique reducing X80 pipe line steel Cold Cracking Susceptibility, to solve in prior art because welding procedure formulates the technical problem of the not good generation cold crack caused.
In order to realize above-mentioned target, the present invention adopts following technical scheme:
Reduce a technique for X80 pipe line steel Cold Cracking Susceptibility, comprise the following steps:
Step 1, preheating:
Preheat temperature is set in 120 DEG C ~ 150 DEG C, preheating width is set in 130mm ~ 160mm, and extends the temperature retention time of weld seam both sides;
Step 2, welding:
Method that capping matches carries out docking boxing to adopt SMAW root bead and self-protection flux-cored wire semiautomatic welding to fill, carries out root weldering respectively, filling is welded and cosmetic welding;
Step 3, post weld heat treatment:
After having welded, butt welded seam carries out local post weld heat treatment immediately, and first high-temperature heating is then slowly cooled to 200 DEG C of insulations 4 hours to 600 DEG C.
Described docking boxing adopts double V-groove, and bevel angle is 55 ° ~ 65 °, and the width of root face is 1.2mm ~ 1.5mm, and alignment clearance is 2.5mm ~ 3mm.
The advanced row root of described docking boxing welds 1 layer, then fills weldering 4 layers, last cosmetic welding 1 layer.
When carrying out described root weldering and fill weldering, core diameter Ф 1.2mm, the electric current of welding is 100A ~ 120A, voltage 18V ~ 22V, and speed of welding is 16cm/min ~ 22cm/min.
Compared with prior art, the invention has the beneficial effects as follows that the higher preheat temperature of employing is to slow down the cooling velocity of postwelding, be conducive to the effusion of diffusible hydrogen in weld metal, also reduce the degree of hardening of weld dimensions simultaneously, improve the crack resistance of welding point.Higher preheat temperature can reduce the temperature difference between welding region and welded piece, reduces welding stress on the one hand, on the other hand, reduces weld strain speed.Postwelding is heat-treated immediately, and Slow cooling after first high-temperature heating is also incubated, and to eliminate postwelding residual stress, impels the diffusion of residual hydrogen excessive.The cold crack because constraint stress and hardened structure cause can be reduced like this.
Detailed description of the invention
Embodiments of the invention select caliber to be Ф 1016mm, and pipe thickness is the X80 pipe line steel of 18.4mm.
Embodiment 1
Select to adopt double V-groove, bevel angle 55 °, width of root face 1.2mm, alignment clearance 2.5mm.Preheat temperature is set in 120 DEG C, and preheating width is set in 130mm, and extends the temperature retention time of weld seam both sides, in order to increase insulation thickness.Adopt hydrogen controlled electrode to carry out root weldering, adopt self-protection flux-cored wire to carry out filling weldering and cosmetic welding.When carrying out root weldering and fill weldering, electric current is 100A, and voltage is 18V, and speed of welding is 16cm/min.When carrying out cosmetic welding, electric current is 120A, and voltage is 18V, and speed of welding is 5cm/min.After having welded, butt welded seam carries out local post weld heat treatment immediately, and first high-temperature heating, to 600 DEG C, is then slowly cooled to 200 DEG C of insulations 4 hours.
Embodiment 2
Select to adopt double V-groove, bevel angle 60 °, width of root face 1.5mm, alignment clearance 3mm.Preheat temperature is set in 140 DEG C, and preheating width is set in 150mm, and extends the temperature retention time of weld seam both sides, in order to increase insulation thickness.Adopt hydrogen controlled electrode to carry out root weldering, adopt self-protection flux-cored wire to carry out filling weldering and cosmetic welding.When carrying out root weldering and fill weldering, electric current is 110A, and voltage is 20V, and speed of welding is 18cm/min.When carrying out cosmetic welding, electric current is 130A, and voltage is 20V, and speed of welding is 8cm/min.After having welded, butt welded seam carries out local post weld heat treatment immediately, and first high-temperature heating, to 600 DEG C, is then slowly cooled to 200 DEG C of insulations 4 hours.
Embodiment 3
Select to adopt double V-groove, bevel angle 65 °, width of root face 1.5mm, alignment clearance 3mm.Preheat temperature is set in 150 DEG C, and preheating width is set in 160mm, and extends the temperature retention time of weld seam both sides, in order to increase insulation thickness.Adopt hydrogen controlled electrode to carry out root weldering, adopt self-protection flux-cored wire to carry out filling weldering and cosmetic welding.When carrying out root weldering and fill weldering, electric current is 120A, and voltage is 22V, and speed of welding is 22cm/min.When carrying out cosmetic welding, electric current is 140A, and voltage is 22V, and speed of welding is 12cm/min.After having welded, butt welded seam carries out local post weld heat treatment immediately, and first high-temperature heating, to 600 DEG C, is then slowly cooled to 200 DEG C of insulations 4 hours.
With reference to GB4675.1 oblique Y type groove welding crack test method, cracking breakout detection is carried out to above-mentioned three examples, detect crackle and with the naked eye can observe on the surface of welding point and section whether there is crackle with magnifying glass.Testing result shows, cracking breakout is only 0.8% ~ 4.5%, far below the welding result of traditional welding procedure 16% ~ 35% cracking breakout, meets the requirement of West-East National Gas Transmission Project X80 grade pipe line steel welding standard completely.
The above; be only the present invention's preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (5)
1. reduce a technique for X80 pipe line steel Cold Cracking Susceptibility, it is characterized in that, comprise the following steps:
Step 1, preheating:
Preheat temperature is set in 120 DEG C ~ 150 DEG C, preheating width is set in 130mm ~ 160mm, and extends the temperature retention time of weld seam both sides;
Step 2, welding:
Method that capping matches carries out docking boxing to adopt SMAW root bead and self-protection flux-cored wire semiautomatic welding to fill, carries out root weldering respectively, filling is welded and cosmetic welding;
Step 3, post weld heat treatment:
After having welded, butt welded seam carries out local post weld heat treatment immediately, and first high-temperature heating is then slowly cooled to 200 DEG C of insulations 4 hours to 600 DEG C.
2. a kind of technique reducing X80 pipe line steel Cold Cracking Susceptibility according to claim 1, is characterized in that, described docking boxing adopts double V-groove, and bevel angle is 55 ° ~ 65 °, and the width of root face is 1.2mm ~ 1.5mm, and alignment clearance is 2.5mm ~ 3mm.
3. a kind of technique reducing X80 pipe line steel Cold Cracking Susceptibility according to claim 2, is characterized in that, the advanced row root of described docking boxing welds 1 layer, then fills weldering 4 layers, last cosmetic welding 1 layer.
4. a kind of technique reducing X80 pipe line steel Cold Cracking Susceptibility according to claim 3, is characterized in that, when carrying out described root weldering and fill weldering, core diameter Ф 1.2mm, the electric current of welding is 100A ~ 120A, and voltage 18V ~ 22V, speed of welding is 16cm/min ~ 22cm/min.
5. a kind of technique reducing X80 pipe line steel Cold Cracking Susceptibility according to claim 3, is characterized in that, when carrying out described cosmetic welding, gage of wire Ф 1mm, the electric current of welding is 120A ~ 140A, and voltage is 18V ~ 22V, and speed of welding is 5cm/min ~ 12cm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310523648.2A CN103586569B (en) | 2013-10-30 | 2013-10-30 | A kind of technique reducing X80 pipe line steel Cold Cracking Susceptibility |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310523648.2A CN103586569B (en) | 2013-10-30 | 2013-10-30 | A kind of technique reducing X80 pipe line steel Cold Cracking Susceptibility |
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| Publication Number | Publication Date |
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| CN103586569A CN103586569A (en) | 2014-02-19 |
| CN103586569B true CN103586569B (en) | 2015-12-02 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103990895B (en) * | 2014-05-14 | 2016-07-13 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of welding method of high-strength seamless steel pipe |
| CN114406554B (en) * | 2022-03-21 | 2023-04-18 | 重庆科技学院 | Device for welding X80 pipeline steel welded pipe and eliminating weld joint stress |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02197380A (en) * | 1989-01-26 | 1990-08-03 | Sumitomo Metal Ind Ltd | Welded steel pipe having excellent sulfide stress crack resistance and production thereof |
| JPH0929429A (en) * | 1995-07-21 | 1997-02-04 | Toshiba Corp | Welding procedure |
| CN101417364A (en) * | 2008-11-20 | 2009-04-29 | 新疆石油工程建设有限责任公司 | Semi-automatic welding method of metal flux cored filler rod conduit root |
| CN101850454A (en) * | 2009-03-31 | 2010-10-06 | 中国石油天然气管道局 | Welding process of heavy-calibre long-distance steel pipeline |
| CN102398105A (en) * | 2010-09-15 | 2012-04-04 | 中国石油天然气集团公司 | Process for integral hardening and tempering of X80 steel-grade automatic submerged arc welding pipe fittings |
| CN103286414A (en) * | 2013-04-27 | 2013-09-11 | 中国石油天然气集团公司 | Welding method of oil gas transmission antisulphour steel pipelines |
-
2013
- 2013-10-30 CN CN201310523648.2A patent/CN103586569B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02197380A (en) * | 1989-01-26 | 1990-08-03 | Sumitomo Metal Ind Ltd | Welded steel pipe having excellent sulfide stress crack resistance and production thereof |
| JPH0929429A (en) * | 1995-07-21 | 1997-02-04 | Toshiba Corp | Welding procedure |
| CN101417364A (en) * | 2008-11-20 | 2009-04-29 | 新疆石油工程建设有限责任公司 | Semi-automatic welding method of metal flux cored filler rod conduit root |
| CN101850454A (en) * | 2009-03-31 | 2010-10-06 | 中国石油天然气管道局 | Welding process of heavy-calibre long-distance steel pipeline |
| CN102398105A (en) * | 2010-09-15 | 2012-04-04 | 中国石油天然气集团公司 | Process for integral hardening and tempering of X80 steel-grade automatic submerged arc welding pipe fittings |
| CN103286414A (en) * | 2013-04-27 | 2013-09-11 | 中国石油天然气集团公司 | Welding method of oil gas transmission antisulphour steel pipelines |
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