CN101204720B - Manufacture method of X80 pipeline JCOE direct sew submerged arc welding tube - Google Patents
Manufacture method of X80 pipeline JCOE direct sew submerged arc welding tube Download PDFInfo
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Abstract
The invention discloses a method for producing a JCOE longitudinal submerged arc welded pipe of an X80 pipeline steel. The invention is used for producing an oil and gas conveying tube with high intensity and high tenacity. The method includes using an HTP X80 controlled rolling steel pipe with a chemical composition of 0.03 to 0.05 percent of C, 0.20 to 0.30 percent of Si, 1.65 to 1.75 percent of Mn, less than or equal to 0.01 percent of P, less than or equal to 0.005 percent of S, 0.10 to 0.15 percent of Nb plus Ti and 0.5 to 0.7 percent of Ni plus Cr plus Cu. A steel plate is made into theoil and gas conveying tube with high intensity and high tenacity through the working procedures like edge milling, edge bending, a 'JCO' forming technique under multi-pass pressing, gas protection prewelding, inside welding, outside welding, diameter enlarging, ultrasonic checking, x-ray checking, hydraulic pressure testing, tube end to arris, ultrasonic checking and X-ray checking, etc. The inside welding and the outside welding of a steel tube adopt four-wire serial union melt welding and control the technical parameters of welding through selecting a suitable welding wire and a welding fluid; thereby controlling the components and organizations of a weld joint to lead the performance of the weld joint to reach the performance requirements of X80.
Description
Technical field
The present invention relates to a kind of manufacturing technology of high-intensity high-tenacity straight-line joint submerged arc welding tube, especially relate to the JCO moulding and the multifibres solder technology of the HTP X80 pipe line steel that the transfer oil natural gas of a kind of Φ of being of a size of 1219mm uses.
Background technology
It is the most rational means of transportation of long-distance transportation petroleum gas that the road is carried, and has economy, safe, efficient, energy-conservation, uninterrupted, and to distinguishing features such as the environmental disruption degree are little.Thereby the development of pipe transportation technology is paid much attention in countries in the world, and many countries spare no expense a large amount of financial resources and material resources are greatly developed pipeline industry.Pipeline transportation has become the fifth-largest transport service after highway, railway, water route and air transportation.
The development trend of pipeline construction is that its requirement of strength is more and more higher to long distance, high pressure, heavy caliber development; In addition, owing to often reach thousands of kilometers from the oil gas place of production to area of consumption, geological conditions complexity, climate variability also propose more and more higher requirement to pipe line steel toughness on the way.At present, external pipeline construction generally adopts X70 grade of steel pipe line steel, and the construction of part long distance line begins to adopt the X80 pipe line steel.And domestic West-East National Gas Transmission Project is brought into use X70, and has carried out the test section of a small amount of X80 steel, the X80 pipe line steel is not still had the high-intensity high-tenacity JCOE straight-line joint submerged arc welding tube that is of a size of Φ 1219 * 22～33mm.
The main process of the production of high tensile steel tube comprises moulding and welding, and its molding mode mainly contains UOE and JCOE, and welding manner mainly adopts Lincoln weld.Though at present external part enterprise has developed the X80 steel pipe, and adopt the JCOE mode produce HTP X80 material, diameter be Φ 1219mm, thickness greater than 22mm, the high-intensity high-tenacity straight-line joint submerged arc welding tube still do not have similar report.To in the high strength welded tube manufacture process, it is the most scabrous to be the reduction of the intensity and the toughness of weld metal and heat affected area in addition, and performance how to control weld seam is the key issue that solution is badly in need of in the exploitation of high strength welded tube.
Summary of the invention
The technical issues that need to address of the present invention provide the high-intensity performance manufacturing technology that require, that adopt JCO forming technique and multiplewire submerged arc welding technology to produce the HTPX80 high-intensity high-tenacity straight-line joint submerged arc welding tube that is of a size of Φ 1219 * 22～33mm of the satisfied HTPX80 pipe line steel steel pipe of a kind of energy.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is to adopt following concrete processing step:
1. adopt the controlled rolling steel plate of HTP X80, its chemical composition (mass percent) is: C 0.03～0.05%, Si 0.20～0.30%, Mn 1.65～1.75%, P≤0.01%, S≤0.005%, Nb+Ti 0.10～0.15%, Ni+Cr+Cu 0.5～0.7%.
2. mill the limit, finished edge; Thickness of slab is respectively the steel plate of 22mm, 26.4mm, 33mm, and groove is of a size of: bevel angle is 40 °, 35 °, 30 ° respectively, and root face is 4mm, 7mm, 9.5mm, the dark 8mm of following groove, 10mm, 12.5mm; The purpose of finished edge is to guarantee that welding process can complete penetration, avoids that incomplete penetration defect appears in inside in the high-speed welding process, realizes good quality and high output.
3. pre-crimp utilizes prebending machine to carry out edges of boards pre-bending, according to the caliber size requirement, makes edges of boards have satisfactory curvature.
4.JCO moulding, on the JCO make-up machine at first with half of the steel plate after the pre-bending through repeatedly stepping punching press, be pressed into " J " shape, again that second half of steel plate is crooked equally, be pressed into " C " shape, form " O " shape of opening at last.Pressing process is promptly suppressed passage and every time drafts and is determined that according to the size of steel pipe when steel plate thickness was 22mm, the punching press number of times adopted 23～27; When steel plate thickness was 26.4mm, the punching press number of times adopted 31～35; When steel plate thickness was 33mm, the punching press number of times adopted 39～43; Above-mentioned punching press time number average adopts odd number, and each drafts adopts respectively at 1.5～2.5mm, 3.5～4.5mm, 10～15mm according to three kinds of different thickness of steel plate.In actual production, should suitably adjust according to actual steel pipe moulding situation.
5. prewelding makes the steel pipe joint close after the moulding and adopts gas shielded arc welding to carry out continuous welding, when guaranteeing in the weld seam welding, and weld seam assembling, standard and steady quality.
6. interior weldering adopts multifibres Lincoln weld to weld in the steel pipe inboard, and first of four Lincoln welds is dc reverse connection, and second to four for exchanging.The technology of four Lincoln welds of HTPX80 pipeline steel submerged arc straight weld pipe of Φ 1219 * 22mm is: first electric current I=1050～1150A, voltage V=32～36V, second electric current I=900～1000A, voltage V=36～40V, the 3rd electric current I=700～800A, voltage V=38～42A, the 4th electric current I=550～650A, voltage V=40～44V; Distance between weldingwires d=18～22mm; Welding speed V=180～190cm/min;
The technology of four Lincoln welds of HTPX80 pipeline steel submerged arc straight weld pipe of Φ 1219 * 26.4mm is: first electric current I=1150～1250A, voltage V=32～36V, second electric current I=850～950A, voltage V=34～38V, the 3rd electric current I=650～750A, voltage V=38～42A, the 4th electric current I=600～700A, voltage V=40～44V; Distance between weldingwires d=18～22mm; Welding speed V=165～175cm/min;
The technology of four Lincoln welds of HTPX80 pipeline steel submerged arc straight weld pipe of Φ 1219 * 33mm is: first electric current I=1200～1300A, voltage V=32～36V, second electric current I=900～1000A, voltage V=36～40V, the 3rd electric current I=750～850A, voltage V=38～42A, the 4th electric current I=650～750A, voltage V=40～44V; Distance between weldingwires d=18～22mm; Welding speed V=145～155cm/min.
7. outside weld adopts multiplewire submerged arc welding to weld in the steel pipe outside, and adopting first of four Lincoln welds is dc reverse connection, and second to four for exchanging.The technology of four Lincoln welds of HTPX80 pipeline steel submerged arc straight weld pipe of Φ 1219 * 22mm is: first electric current I=1150～1250A, voltage V=32～36V, second electric current I=950～1050A, voltage V=36～40A, the 3rd electric current I=650～750A, voltage V=38～42V, the 4th electric current I=550～650A, voltage V=40～44V; Distance between weldingwires d=18～22mm; Welding speed V=180～190cm/min;
The technology of four Lincoln welds of HTPX80 pipeline steel submerged arc straight weld pipe of Φ 1219 * 26.4mm is: first electric current I=1250～1350A, voltage V=32～36V, second electric current I=900～1000A, voltage V=34～38A, the 3rd electric current I=750～850A, voltage V=38～42V, the 4th electric current I=550～650A, voltage V=40～44V; Distance between weldingwires d=18～22mm; Welding speed V=175～185cm/min;
The technology of four Lincoln welds of HTPX80 pipeline steel submerged arc straight weld pipe of Φ 1219 * 33mm is: first electric current I=1300～1400A, voltage V=32～36V, second electric current I=950～1050A, voltage V=36～40A, the 3rd electric current I=800～900A, voltage V=38～42V, the 4th electric current I=650～750A, voltage V=40～44V; Distance between weldingwires d=18～22mm; Welding speed V=150～160cm/min.
8. ultrasonic inspection I carries out 100% inspection to inner and outer welding and weld seam both sides mother metal;
9.X radiological survey X I carries out 100% X ray industrial television inspection to inner and outer welding, adopts image processing system to guarantee the sensitivity of flaw detection;
10. hole enlargement is carried out the dimensional accuracy of hole enlargement with the raising steel pipe to the steel pipe total length, and improves the distribution of steel pipe internal stress;
11. the water pressure test is being pursued root check guaranteeing that steel pipe reaches the test pressure of standard-required to the steel pipe after the hole enlargement on the hydrostatic testing machine,
12. chamfered edge carries out pipe end processing with after the assay was approved steel pipe, meets the requirements of pipe end groove size;
13. ultrasonic inspection II carries out ultrasonic inspection to check steel pipe issuable defective behind hole enlargement, hydraulic pressure by root once more;
14.X radiological survey X II carries out inspection of X ray industrial television and the film making of pipe end weld seam to the steel pipe after the hole enlargement and the water pressure test;
15. the pipe end magnetic powder test is carried out this and is checked to find the pipe end defective;
16. anticorrosion and coating, the steel pipe after qualified carries out anticorrosion and coating according to customer requirements.
Because the technological progress of having adopted technique scheme, the present invention to obtain is:
The invention solves HTP X80 material, diameter is Φ 1219mm, thickness are difficult to satisfy specification requirement for moulding in the high-intensity high-tenacity JCOE straight-line joint submerged arc welding tube manufacturing of * 22～33mm and Weld Performance problem.The present invention adopts the JCO moulding, and selects reasonable welding material and technology, particularly controls welding condition, makes the welded tube performance satisfy the performance requirement of X80 pipe line steel steel pipe.
Key problem in technology of the present invention is the optimization of JCO moulding process and welding procedure, and technological parameter and processing step that the present invention is above-mentioned are obtained through test of many times.Its key technology mainly shows: in moulding control, the punching press number of times changes with caliber and the different of sheet metal thickness, and adopts odd number compacting number of times.Because the armor plate strength height, elasticity is big, i.e. distortion back resilience is serious, every time drafts should adopt excessive depressing, and guaranteeing reaching the dimensional requirement of steel pipe after the steel plate resilience, and adopts the pressing process of more number of times as far as possible, guarantee more to adjust the space, guarantee better mouldability.
In welding procedure, be the performance and the welding quality of control weld seam, the present invention adopts a kind of welding manner of four tandems, inside and outside weld seam divides four layers of continuous welding respectively and once finishes, first is bottom, and second and the 3rd is packed layer, and the 4th is the capping layer.Be characterized in: one can reduce the hot input quantity of unit length, dwindles the heat affected area, makes the weld seam performance on every side of senior pipe line steel reach the highest; It two is to have taken into account inherent quality and presentation quality; It three is to have taken into account high efficiency production and excellent quality.On technological parameter was selected, first effect mainly was to guarantee depth of penetration, therefore adopts bigger welding current and low arc voltage; Second and third effect mainly is to fill weld seam, make first can be excessive preferably with the 4th, obtains good weld shape, and fully exhaust and deslagging, to obtain the excellent quality of whole piece weld seam, so employing is medium welding current and arc voltage; The 4th effect mainly is a capping, promptly obtains the good surface appearance quality, makes weld seam and mother metal smooth excessiveness, reduces or eliminates the mass defect of undercut, and what therefore adopt is little welding current and high arc voltage.Adopting tandem four wire bonds that weld seam is once welded finishes, can realize high-speed welding; The distance between weldingwires of four submerged-arc weldings of tandem is adjusted into 18～22mm, can be that welding heat is dispersed in the surrounding medium as early as possible, thereby avoids heat to concentrate, and reduces the influence of heat affected area on every side of welding heat butt welded seam, guarantees the performance of weld heat-affected zone.
The control of butt welded seam metal structure and performance, composition, welding procedure according to steel plate, by choose reasonable welding material (welding wire and solder flux), the Composition Control that makes weld seam is at C 0.06～0.08%, Si 0.20～0.35%, Mn 1.65～1.75%, P≤0.01%, S≤0.005, Nb+Ti 0.08～0.12%, Ni+Cr+Cu 0.4～0.5%, Cr+Mo+Mn 1.8～2.1%, the room temperature texture of weld seam is the tissue based on acicular ferrite+bainite like this, thereby guarantees that the weld(ing) deposit promptly has high intensity and has high toughness again.
The specific embodiment
Concrete manufacturing process below in conjunction with the steel pipe of making the transfer oil natural gas is described in further details the present invention:
Embodiment 1
1. adopting thickness is the controlled rolling steel plate of the HTP X80 of 33mm, and its chemical composition (mass percent) is: C 0.03%, and Si 0.20%, Mn 1.65%, P≤0.005%, S≤0.003%, Nb 0.09%, Cr 0.03%, Nb+Ti 0.12%, and Ni+Cr+Cu 0.67%, and N 0.03%, its carbon equivalent Ceq is 0.42, and cold cracking FACTOR P cm is 0.17.
2. mill the limit, finished edge; To the steel plate of thickness of slab 33mm, groove is of a size of: upper and lower bevel angle is 30 °, root face 9.5mm, the dark 12.5mm of following groove.
3. pre-crimp utilizes prebending machine to carry out edges of boards pre-bending, according to the caliber size requirement, makes edges of boards have satisfactory curvature.
4.JCO moulding, on the JCO make-up machine at first with half of the steel plate after the pre-bending through 19 passage stepping punching presses, be pressed into " J " shape, again that second half of steel plate is crooked equally, be pressed into " C " shape, once form " O " shape of opening at last in the middle punching press of steel plate.Whole pressing process adopts 39 passage compression mouldings; Every time drafts is 15mm, in actual production, can suitably adjust according to actual steel pipe moulding situation.
5. prewelding makes the steel pipe joint close after the moulding and adopts gas shielded arc welding to carry out continuous welding, when guaranteeing in the weld seam welding, and weld seam assembling, standard and steady quality.
6. interior weldering adopts multifibres Lincoln weld to weld in the steel pipe inboard, and first of four Lincoln welds is direct current, and second to four for exchanging.The technology of four Lincoln welds is: first electric current I=1200A, voltage V=32V, second electric current I=900A, voltage V=36V, the 3rd electric current I=750A, voltage V=38A, the 4th electric current I=650A, voltage V=40V; Distance between weldingwires d=18mm; Welding speed V=145cm/min.
7. outside weld adopts multiplewire submerged arc welding to weld in the steel pipe outside, and adopting first of four Lincoln welds is dc reverse connection, and second to four for exchanging.The technology of four Lincoln welds is: first electric current I=1300A, voltage V=32V, second electric current I=950A, voltage V=36A, the 3rd electric current I=800A, voltage V=38V, the 4th electric current I=650A, voltage V=40V; Distance between weldingwires d=18mm; Welding speed V=150cm/min.
8. ultrasonic inspection I carries out 100% inspection to inner and outer welding and weld seam both sides mother metal.
9.X radiological survey X I carries out 100% X ray industrial television inspection to inner and outer welding, adopts image processing system to guarantee the sensitivity of flaw detection.
10. hole enlargement is carried out the dimensional accuracy of hole enlargement with the raising steel pipe to the steel pipe total length, and improves the distribution of steel pipe internal stress.
11. the water pressure test is being pursued the root check to guarantee that steel pipe reaches the test pressure of standard-required to the steel pipe after the hole enlargement on the hydrostatic testing machine.
12. chamfered edge carries out pipe end processing with after the assay was approved steel pipe, meets the requirements of pipe end groove size.
13. ultrasonic inspection II carries out ultrasonic inspection to check steel pipe issuable defective behind hole enlargement, hydraulic pressure by root once more.
14.X radiological survey X II carries out inspection of X ray industrial television and the film making of pipe end weld seam to the steel pipe after the hole enlargement and the water pressure test.
15. the pipe end magnetic powder test is carried out this and is checked to find the pipe end defective.
16. anticorrosion and coating, the steel pipe after qualified carries out anticorrosion and coating according to customer requirements.
That table 1 provides is the weld seam chemical composition analysis result of present embodiment.Through the metallographic structure of welding point is analyzed, weld structure is acicular ferrite+bainite structure, shows that seam organization control is suitable.Table 2,3,4 has provided the performance test results of steel pipe material object.By table as seen, reached the specification requirement of X80 grade of steel pipeline steel tube.
The chemical composition of table 1 weld metal (wt.%)
| C | Mn | Si | P | S | Nb+Ti | Ni+Cr+Cu | Cr+Mo+Mr | |
| Outside weld | 0.06 | 1.72 | 0.31 | 0.01 | 0.004 | 0.1 | 0.44 | 2.0 |
| Inside weld | 0.06 | 1.74 | 0.30 | 0.01 | 0.004 | 0.11 | 0.48 | 2.0 |
Table 2X80 LSAW steel pipe stretch test result
| Specimen types | Yield strength Rt 0.5(MPa) | Tensile strength Rm (MPa) | Percentage elongation (%) | Yield tensile ratio | Strength of welded joint | |
| The horizontal rectangle of body flattens | 560～576 | 690～705 | 54 | 0.81～0.82 | 668～676 | |
| The horizontal pole of body | 630～640 | 680～690 | 22～24 | 0.93 | ||
| Standard-required | The horizontal rectangle of body | 555～690 | 625～825 | ≥21 | ≤0.92 | ≥625 |
| The horizontal pole of body | ≥16/14 | ≤0.93 | ||||
Table 3X80 LSAW steel pipe Charpy-type test result
| Gap position | Test temperature (℃) | Ballistic work (J) | The section of shear (SA%) | ||
| Actual measurement | Standard | Actual measurement | Standard | ||
| Body Ave/Min | -10 | 422/415 | 180/140 | 100 | 90/80 |
| Weld seam Ave/Min | 195/190 | 80/60 | 72/70 | 40/30 | |
| Hot-zone Ave/Min | 337/330 | 90/90 | |||
Table 4X80 welding point mixcrohardness test is unit: HV as a result
10
| Hardness HV 10 | |||||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 208 | 221 | 226 | 229 | 231 | 223 | 223 | 217 | 220 | 227 | 232 | 230 | 226 | 228 |
| Hardness HV 10 | |||||||||||||
| " transfering natural gas from the west to the east two wires natural gas pipeline projects straight-line joint submerged arc welding tube technical conditions " require :≤275HV10 |
Embodiment 2
1. adopting thickness is the controlled rolling steel plate of the HTP X80 of 26.4mm, and its chemical composition (mass percent) is: C 0.03%, and Si 0.20%, Mn 1.65%, P≤0.005%, S≤0.003%, Nb 0.09%, Cr0.03%, Nb+Ti 0.11%, and Ni+Cr+Cu 0.67%, and N 0.03%, its carbon equivalent Ceq is 0.41, and cold cracking FACTOR P cm is 0.16.
2. mill the limit, finished edge; To the steel plate of thickness of slab 26.4mm, groove is of a size of: upper and lower bevel angle is 35 °, root face 8mm, the dark 10mm of following groove.
3. pre-crimp is with embodiment 1.
4.JCO moulding, on the JCO make-up machine at first with half of the steel plate after the pre-bending through 15 stepping punching presses, be pressed into " J " shape, again that second half of steel plate is crooked equally, be pressed into " C " shape, carry out " O " shape that a punching press forms opening in the centre of steel plate at last.Whole pressing process adopts the deformation technique of 31 passages; Every time drafts is 4.5mm, in actual production, can suitably adjust according to actual steel pipe moulding situation.
5. prewelding is with embodiment 1.
6. interior weldering adopts multifibres Lincoln weld to weld in the steel pipe inboard, and first of four Lincoln welds is direct current, and second to four for exchanging.The technology of four Lincoln welds is: first electric current I=1250A, voltage V=36V, second electric current I=950A, voltage V=338V, the 3rd electric current I=750A, voltage V=42A, the 4th electric current I=700A, voltage V=44V; Distance between weldingwires d=22mm; Welding speed V=175cm/min.
7. outside weld adopts multiplewire submerged arc welding to weld in the steel pipe outside, and adopting first of four Lincoln welds is dc reverse connection, and second to four for exchanging.The technology of four Lincoln welds is: first electric current I=1350A, voltage V=36V, second electric current I=1000A, voltage V=38A, the 3rd electric current I=850A, voltage V=42V, the 4th electric current I=650A, voltage V=44V; Distance between weldingwires d=22mm; Welding speed V=185cm/min.
Operation 8 is identical with embodiment 1 to operation 16.
That table 5 provides is the weld seam chemical composition analysis result of present embodiment.Through the metallographic structure of welding point is analyzed, weld structure is acicular ferrite+bainite structure, shows that seam organization control is suitable.Table 6,7,8 has provided the performance test results of steel pipe material object.By table as seen, reached the specification requirement of X80 grade of steel pipeline steel tube.
The chemical composition of table 5 weld metal (wt.%)
| C | Mn | Si | P | S | Nb+Ti | Ni+Cr+Cu | Cr+Mo+Mr | |
| Outside weld | 0.06 | 1.65 | 0.31 | 0.01 | 0.004 | 0.09 | 0.48 | 1.927 |
| Inside weld | 0.06 | 1.68 | 0.30 | 0.01 | 0.004 | 0.10 | 0.525 | 1.965 |
Table 6X80 LSAW steel pipe stretch test result
| Specimen types | Yield strength Rt 0.5(MPa) | Tensile strength Rm (MPa) | Percentage elongation (%) | Yield tensile ratio | Strength of welded joint | |
| The horizontal rectangle of body flattens | 560～600 | 675～700 | 44～47 | 0.82～0.89 | 690～705 | |
| The horizontal pole of body | 585～620 | 675～700 | 25～27 | 0.87～0.89 | ||
| Standard-required | The horizontal rectangle of body | 555～690 | 625～825 | ≥21 | ≤0.92 | ≥625 |
| The horizontal pole of body | ≥16/14 | ≤0.93 | ||||
Table 7X80 LSAW steel pipe Charpy-type test result
| Gap position | Test temperature (℃) | Ballistic work (J) | The section of shear (SA%) | ||
| Actual measurement | Standard | Actual measurement | Standard | ||
| Body Ave/Min | -10 | 450/415 | 180/140 | 100 | 90/80 |
| Weld seam Ave/Min | 185/160 | 80/60 | 60/70 | 40/30 | |
| Hot-zone Ave/Min | 215/185 | 80/70 | |||
Table 8X80 welding point mixcrohardness test is unit: HV as a result
10
| Hardness HV 10 | |||||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 215 | 225 | 225 | 235 | 240 | 230 | 230 | 220 | 225 | 225 | 250 | 250 | 230 | 220 |
| " transfering natural gas from the west to the east two wires natural gas pipeline projects straight-line joint submerged arc welding tube technical conditions " require :≤275HV10 | |||||||||||||
Embodiment 3
1. adopting thickness is the controlled rolling steel plate of the HTP X80 of 22mm, and its chemical composition (mass percent) is: C 0.02%, and Si 0.20%, Mn 1.65%, P≤0.005%, S≤0.003%, Nb 0.09%, Cr0.03%, Nb+Ti 0.10%, and Ni+Cr+Cu 0.67%, and N 0.03%, its carbon equivalent Ceq is 0.40, and cold cracking FACTOR P cm is 0.15.The yield strength Rt of steel plate
0.5Be 570～595MPa, tensile strength Rm is 700～720MPa, and percentage elongation is 44～45%.
2. mill the limit, finished edge; To the steel plate of thickness of slab 22mm, groove is of a size of: upper and lower bevel angle is 40 °, root face 4mm, the dark 8mm of following groove.
3. pre-crimp is with embodiment 1.
4.JCO moulding, on the JCO make-up machine at first with half of the steel plate after the pre-bending through 11 stepping punching presses, be pressed into " J " shape, again that second half of steel plate is crooked equally, be pressed into " C " shape, once make " O " shape of steel plate formation opening at last in middle the punching press of " C " shape.Whole pressing process adopts the distortion number of times of 23 passages; Every time drafts is 2.5mm, in actual production, can suitably adjust according to actual steel pipe moulding situation.
5. prewelding is with embodiment 1.
Weldering in 6 adopts multifibres Lincoln weld to weld in the steel pipe inboard, and first of four Lincoln welds is direct current, and second to four for exchanging.The technology of four Lincoln welds is: first electric current I=1050A, voltage V=32V; Second electric current I=900A, voltage V=36V; The 3rd electric current I=700A, voltage V=38A; The 4th electric current I=550A, voltage V=40V; Distance between weldingwires d=18mm; Welding speed V=180cm/min.
7 outside welds adopt multiplewire submerged arc welding to weld in the steel pipe outside, and adopting first of four Lincoln welds is dc reverse connection, and second to four for exchanging.The technology of four Lincoln welds is: first electric current I=1150A, voltage V=32V; Second electric current I=950A, voltage V=36A; The 3rd electric current I=650A, voltage V=38V; The 4th electric current I=550A, voltage V=40V; Distance between weldingwires d=18mm; Welding speed V=180cm/min.
8 to 16 operations are identical with embodiment 1.
Table 9 has provided the weld seam chemical composition analysis result of present embodiment, is acicular ferrite+bainite structure through weld structure, shows that seam organization control is suitable.Table 10,11,12 has provided the performance test results of steel pipe material object.By table as seen, reached the specification requirement of X80 grade of steel pipeline steel tube.
The chemical composition of table 9 weld metal (wt.%)
| C | Mn | Si | P | S | Nb+Ti | Ni+Cr+Cu | Cr+Mo+Mr | |
| Outside weld | 0.06 | 1.62 | 0.31 | 0.01 | 0.004 | 0.08 | 0.44 | 1.9 |
| Inside weld | 0.06 | 1.64 | 0.30 | 0.01 | 0.004 | 0.09 | 0.48 | 1.9 |
Table 10X80 LSAW steel pipe stretch test result
| Specimen types | Yield strength Rt 0.5(MPa) | Tensile strength Rm (MPa) | Percentage elongation (%) | Yield tensile ratio | Strength of welded joint | |
| The horizontal rectangle of body flattens | 555～575 | 675～685 | 44 | 0.82～0.84 | 675～700 | |
| The horizontal pole of body | 585～600 | 695～700 | 25～27 | 0.84～0.86 | ||
| Standard-required | The horizontal rectangle of body | 555～690 | 625～825 | ≥21 | ≤0.92 | ≥625 |
| The horizontal pole of body | ≥16/14 | ≤0.93 | ||||
Table 11X80 LSAW steel pipe Charpy-type test result
| Gap position | Test temperature (℃) | Ballistic work (J) | The section of shear (SA%) | ||
| Actual measurement | Standard | Actual measurement | Standard | ||
| Body Ave/Min | -10 | 420/365 | 180/140 | 100 | 90/80 |
| Weld seam Ave/Min | 150/130 | 80/60 | 60/70 | 40/30 | |
| Hot-zone Ave/Min | 230/215 | 80/70 | |||
Table 12X80 welding point mixcrohardness test is unit: HV as a result
10
| Hardness HV 10 | |||||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 215 | 225 | 225 | 234 | 238 | 228 | 227 | 221 | 223 | 225 | 247 | 247 | 227 | 220 |
| " transfering natural gas from the west to the east two wires natural gas pipeline projects straight-line joint submerged arc welding tube technical conditions " require :≤275HV10 | |||||||||||||
Claims (3)
1. the manufacture method of an X80 pipeline JCOE direct sew submerged arc welding tube, it is C0.03～0.05% that steel plate adopts chemical composition, Si 0.20～0.30%, Mn 1.65～1.75%, P≤0.01%, S≤0.005%, Nb+Ti 0.10～0.15%, the X80 controlled rolling steel plate of Ni+Cr+Cu 0.5～0.7%, molding procedure comprises mills the limit, crimp, moulding, the gas shield prewelding, interior weldering, outside weld, hole enlargement, ultrasonic examination, X-ray examination, the water pressure test, pipe end is to rib, ultrasonic wave, X-ray procedure, it is characterized in that: described molding procedure adopts the JCO moulding process, promptly on the JCO make-up machine, at first make steel plate become " J " shape through stepping punching press repeatedly half of the steel plate after the pre-bending, again second half of steel plate bent to " C " shape with same method, the middle pressing one-time at steel plate makes steel plate become " O " shape of opening at last; The punching press number of times adopts the compacting number of times of 23～43 odd numbers, and each drafts is at 1.5～15mm.
2. the manufacture method of a kind of X80 pipeline JCOE direct sew submerged arc welding tube according to claim 1, it is characterized in that: welder's preface adopts four tandem Lincoln welds in described, first electric current I=1050～1300A, voltage V=32～36V, second electric current I=850～1000A, voltage V=34～40V, the 3rd electric current I=650～850A, voltage V=38～42A, the 4th electric current I=550～750A, voltage V=40～44V; Distance between weldingwires d=18～22mm; Welding speed V=145～190cm/min.
3. the manufacture method of a kind of X80 pipeline JCOE direct sew submerged arc welding tube according to claim 1 is characterized in that described outside weld operation adopts four tandem Lincoln welds, and first is direct current, and second to four for exchanging; The technology of four tandem Lincoln welds is: first electric current I=1150～1400A, voltage V=32～36V, second electric current I=900～1050A, voltage V=34～40A, the 3rd electric current I=650～900A, voltage V=38～42V, the 4th electric current I=550～750A, voltage V=40～44V; Distance between weldingwires d=18～22mm; Welding speed V=150～190cm/min.
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| CN2007101853463A CN101204720B (en) | 2007-12-10 | 2007-12-10 | Manufacture method of X80 pipeline JCOE direct sew submerged arc welding tube |
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| CN2007101853463A CN101204720B (en) | 2007-12-10 | 2007-12-10 | Manufacture method of X80 pipeline JCOE direct sew submerged arc welding tube |
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| CN101204720B true CN101204720B (en) | 2010-11-24 |
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