CN101797600B - Method for manufacturing high-strength X100 steel grade spiral seam submerged arc welded pipe - Google Patents
Method for manufacturing high-strength X100 steel grade spiral seam submerged arc welded pipe Download PDFInfo
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Abstract
The invention discloses a method for manufacturing a high-strength X100 steel grade spiral seam submerged arc welded pipe. The method comprises the following steps: uncoiling, flattening, edge milling, pre-springing, molding, inside welding, outside welding, pipe end belling, base metal layering ultrasonic examination, weld seam X ray inspection, hydrostatic test, weld seam ultrasonic inspection, pipe end chamfering and finished product inspection. In the technical steps of the preparation method, double edge milling process, pre-springing process and pipe end belling process are added so as to successfully solve the technical problems that the high-strength X100 steel grade spiral seam submerged arc welded pipe has poor molding stability, the welding joint performance cannot meet technical requirement and the like.
Description
Technical field
The present invention relates to a kind of spiral seam submerged-arc welding pipe and manufacturing technology thereof, especially a kind of method for manufacturing high-strength X 100 steel grade spiral seam submerged arc welded pipe.
Background technology
Spiral seam submerged-arc welding pipe is rolled steel plate to be undertaken behind the helical buckling welding together along the slit of steel plate butt joint by certain radius of curvature process.Because spiral seam submerged-arc welding pipe has advantages such as investment is low, production is wide in variety, therefore becomes the maximum a kind of manufacture of steel pipe of present domestic use amount.But because the mode of its moulding and restriction such as steel strength is all lower for a long time, seldom to the production of high tensile steel tube.At present, the steel tube place that produces of spiral seam submerged-arc welding pipe all surpasses the X80 grade of steel with steel.Along with pipeline construction to long distance, high pressure, bigbore development, the requirement of strength of steel pipe is significantly increased.For example make spiral seam submerged-arc welding pipe and also do not have disclosed technical research at present with X100 high-strength line-pipe rolled steel plate.Still there are a lot of problems in the present mode of production when production high strength helical seam submerged-arc welded (SAW) pipe; Mainly show: along with the intensity increase of steel; Steel band is in former; Especially it is insufficient to send the distortion of limit one side strip edge edge, and that generally adopts at present simultaneously cuts the following flange phenomenon that limit technology also can cause edges of boards, in operation subsequently as do not correct; When the moulding interlock, occur being in a pout, becoming defectives such as groove part is tight inside but loose outside, misalignment in the production easily, even can cause critical defects such as weld seam micro-crack; Problems such as the crescent moon that roll bending self exists is curved have influenced the forming stability of steel pipe highlightedly, and the girth of steel pipe and ovality are changed greatly, can not effectively guarantee the stability of steel pipe appearance and size, construct for the steel pipe field joint and affect; In addition, with the intensity increase of steel, make welding process become difficult more, tissue and performance how to control welding point also are key issues that needs solution.
Summary of the invention
The technical problem that the present invention will solve provides a kind of method for manufacturing high-strength X 100 steel grade spiral seam submerged arc welded pipe, and this method is particularly useful for the manufacturing of Φ 1016 * 15.3mm high-strength X 100 steel grade spiral seam submerged arc welded pipe.
For solving the problems of the technologies described above, the weight content of spiral seam submerged-arc welding pipe main chemical compositions of the present invention is: C 0.04～0.06%, and Si 0.20～0.30%, and Mn 1.8～2.0%, P≤0.015%; S≤0.003%, Cr≤0.40%, Ni≤0.50%, Cu≤0.30%; Mo≤0.40%, Ti≤0.020%, Nb≤0.10%, V≤0.06%; Al≤0.06%, N≤0.006%, B≤0.0005%, surplus is Fe; Pcm≤0.23% wherein, CEIIW 0.50～0.55%; Its manufacturing procedure comprises: uncoiling, leveling, mill limit, pre-bending, moulding, interior weldering, outside weld, pipe end hole enlargement, mother metal layering ultrasonic examination, weld seam X-ray examination, the water pressure test, weld joint ultrasonic inspection, pipe end chamfered edge, finished product inspection.
The inventive method is compared main increased two mill limit operation, pre-bending limit operation, pipe end hole enlargement operations with the process route of existing processing spiral seam submerged-arc welding pipe.To high grade of steel, heavy caliber spiral welding steel pipe, the probability that defectives such as pore, slag inclusion, crackle occur in the weld seam increases, and the present invention adopts advanced Dynamic Non-Destruction Measurement to realize effective detection of butt welded seam inherent quality.Through adopting weld defect to judge computer expert system, the image of butt welded seam x-ray inspection carries out the real time scan analysis, and the function of the automatic identification of completion defective, mark, warning, record realizes the automation of x-ray inspection; On ultrasonic system, adopt the laser automatic tracking technology, improve its mechanical device simultaneously, under the prerequisite that guarantees the probe holder rigidity, probe contacts with steel pipe is flexible, thereby improves the accuracy and the reliability of automatic ultrasonic wave inspection.
The technology of preferably milling the limit operation is milled limit technology for two: rough mill I type groove earlier, finish-milling X type groove then, root face 6～8mm, 70 °～90 ° of bevel angles.Bevelled purpose is to guarantee that coiled sheet can through welding in welding process, and improves speed of welding, improves the weld seam pattern, reduces weld heat input, reduces the sweating heat input to welding heat affected zone tissue and Effect on Performance, the performance of raising weld heat-affected zone.
The technology of preferred pre-bending operation is: adopt prebending machine to roll bending send the limit and free margins carries out the pre-bending limit, the pre-bending limit is of a size of radius 1470mm, length 100～130mm.
In the forming process of the spiral seam submerged-arc welding pipe of major diameter, high grade of steel, the limit portion of the band steel of the opposite joint both sides that heal up usually with the circular curve transition or little in dehisce comparatively suitable; Steel band is especially sent limit one side in former, horn need be given the internal welding device headspace, and end moulding roll spacing edges of boards are 50mm at least.If do not use the crimp roller, will cause the distortion of strip edge edge insufficient; Sometimes trimming process also can cause the following flange phenomenon of edges of boards; Defectives such as groove part is tight inside but loose outside, misalignment appear being in a pout, become when causing the moulding interlock easily in the production; Have a strong impact on steel pipe presentation quality and later welding sequence, even can cause critical defects such as weld seam micro-crack, can't operation afterwards eliminate; Have a strong impact on pipe quality, cause the steel pipe qualification rate to descend.Therefore be directed against the yield strength of the high-strength X 100 steel grade pipe line steel of Φ 1016 * 15.3mm; Through means such as setting-out, analysis on elasticity; The strip edge edge is carried out abundant pre-bending, can effectively eliminate be in a pout, forming defect such as misalignment, steel pipe moulding welding quality is improved significantly.
The technology of welder's preface is in preferred: adopt the Lincoln weld of mariages tandem, first is direct current, its electric current I=1000～1200A, voltage V=31～33V; Second for exchanging its electric current I=430～470A, voltage V=35～37V; Distance between weldingwires d=10～14mm, welding speed V=1.4～1.6m/min.The technology of preferred outside weld operation is: adopt the Lincoln weld of mariages tandem, first is direct current, its electric current I=1100～1300A, voltage V=33～35V; Second for exchanging its electric current I=400～450A, voltage V=35～37V; Distance between weldingwires d=12～16mm, welding speed V=1.4～1.6m/min.Weldering, outside weld technology all adopt high-toughness submerged arc welding solder flux and welding wire in said, and adopt tracking accuracy to reach the laser welded seam autotracker of 0.25mm.
Because the mother metal that steel tube place uses is low-carbon microalloyed high strength steel, its carbon equivalent ce
IIWReached more than 0.5%, had certain degree of difficulty during welding.In welding process,,, confirmed that interior weldering and outside weld all adopt mariages tandem Lincoln weld technology through experimental study for the performance and the welding quality of control welding point.Select the main effect of said welding method parameter to be: first effect mainly is to guarantee depth of penetration.Need to adopt big welding current, low arc voltage; Second effect mainly is a capping, promptly obtains the good surface appearance quality, and weld seam and mother metal seamlessly transit, and reduces and the elimination undercut, needs to adopt little welding current and higher arc voltage; First cooperates with second, and fully exhaust, deslagging obtain good weld shape, good quality.Adopt above-mentioned technology, comprehensive mother metal, welding wire and solder flux chemical composition property of welded joint require scientific and reasonable coupling, and the composition of control weld seam is in following scope (weight): C 0.04～0.06%, Si0.30～0.40%; Mn 1.90～2.0%, P≤0.02%, S≤0.005%, Cr≤0.35%; Ni≤0.40%, Cu≤0.25%, Mo≤0.35%, Ti≤0.025%; Nb≤0.07%, V≤0.01%, surplus is an iron.The metallographic structure that welding back weld seam obtains is main with acicular ferrite+bainite, thereby guarantees that the weld(ing) deposit has high combination of strength and toughness and inherent quality and physicochemical property.
The technology of preferred pipe end hole enlargement operation is: in pipe end 300mm scope, carry out cold hole enlargement, maximum hole enlargement amount is 0.6% of a diameter; Pipe end girth deviation ± 1.5mm, the ovality deviation is smaller or equal to 2mm.The dimensional stability of pipe end directly has influence on the efficient of on-the-spot pipeline construction, and the present invention increases the pipe end expanding technology when optimizing the steel pipe moulding process; Pipe end is carried out full circle; Controlled the pipe end dimensional accuracy preferably, reached pipe end girth deviation ± 1.5mm, the ovality deviation is smaller or equal to the level of 2mm; Improve the on-the-spot butt joint efficient of steel pipe greatly, made things convenient for the site operation operation.
Adopt the beneficial effect that technique scheme produced to be: the present invention makes in the technology of high-strength X 100 steel grade spiral seam submerged arc welded pipe; Compare with the common spiral seam submerged-arc welding pipe of manufacturing; Increased two limit operation, pre-bending limit operation, pipe end hole enlargement operations of milling in the processing step, successful solution in the high-intensity X100 steel grade spiral seam submerged arc welded pipe manufacturing forming stability difference and property of welded joint be difficult to satisfy technical barriers such as specification requirement; Be particularly useful for the manufacturing of Φ 1016 * 15.3mm high-strength X 100 steel grade spiral seam submerged arc welded pipe.
The specific embodiment
Below in conjunction with specific embodiment the present invention is done further detailed explanation.
Embodiment 1:
The main chemical compositions of the used coiled sheet of present embodiment high-strength X 100 steel grade spiral seam submerged arc welded pipe is as shown in table 1, and mechanical property is shown in table table 2, and the thickness of steel plate is 15.3mm, and the external diameter of steel pipe is Φ 1016mm.The manufacturing technology steps of this high-strength X 100 steel grade spiral seam submerged arc welded pipe is following:
1, coiled sheet is through uncoiling, leveling;
2, mill the limit: rough mill earlier, the edges of boards width is milled away 10～20mm; Finish-milling X type groove then, the edges of boards that are about to two butt joints of roll of steel plate are left root face respectively to be of a size of 8mm, bevel angle are 35 ° groove, and the butt joint back, two limits of steel plate forms 70 ° double V grooves;
3, pre-bending: on joggling machine to roll bending send the limit and free margins carries out the pre-bending limit, making radius size is 1470mm; Length 100～130mm;
4, moulding: the band steel that will pass through above-mentioned pre-bending limit rolls into the helical form cylinder that diameter is Φ 1016mm at the three-roll formation device;
5, welding: carry out interior weldering and outside weld, welding condition such as table 3, the main chemical compositions such as the table 4 of weld seam along the seam of steel pipe cylinder;
6, pipe end hole enlargement: in pipe end 300mm scope, carry out cold hole enlargement, maximum hole enlargement amount is 0.6% of a diameter; Pipe end girth deviation ± 1.5mm, ovality deviation ± 2mm; Extension diameter section should seamlessly transit with extension diameter section not;
7, flaw detection: mother metal is carried out layering ultrasonic examination and X-ray examination;
8, the water pressure test;
9, butt welded seam carries out ultrasonic examination and the spy of ultrasonic wave hand;
10, pipe end chamfered edge: the end seamed edge to steel pipe carries out abate;
11, finished product inspection.
Table 5 provides is the steel pipe of the present embodiment main performance testing result in kind and the main performance requirement of X100 steel grade spiral seam submerged arc welded pipe; Visible by table, the spiral seam submerged-arc welding pipe that utilizes technology of the present invention to make has reached the specification requirement of X100 steel grade spiral seam submerged arc welded pipe.
The main chemical compositions of table 1 coiled sheet (wt.%)
| C | Mn | Si | P | S | V+Nb +Ti | Ni+Cr +Cu | Cr+Mo +Mn | CE IIW | CEpcm |
| 0.048 | 1.96 | 0.24 | 0.013 | 0.001 | 0.13 | 0.96 | 2.51 | 0.52 | 0.22 |
Table 2 coiled sheet (30 ° of rolling directions) tension test value
| Yield strength Rt 0.5 (MPa) | Tensile strength Rm (MPa) | Yield tensile ratio Rt 0.5/Rm | Percentage elongation A50mm (%) | |
| Min | 695 | 795 | 0.84 | ?31 |
| Max | 735 | 820 | 0.88 | ?37 |
| Ave | 715 | 815 | 0.85 | ?35 |
Table 3 Double Wire Welding parameter
The chemical composition of table 4 weld metal (wt.%)
| C | Mn | Si | P | S | V+Nb+ | Ni+Cr+ | Cr+Mo+ |
| Ti | Cu | Mn | ||||||
| Outside weld | 0.049 | 2.04 | 0.34 | 0.015 | 0.001 | 0.07 | 0.71 | 2.52 |
| Inside weld | 0.048 | 2.05 | 0.36 | 0.016 | 0.001 | 0.07 | 0.72 | 2.53 |
Table 5 steel pipe mechanical property
Embodiment 2:
The main chemical compositions of the X100 grade of steel coiled sheet that the present embodiment submerged-arc welded (SAW) pipe adopts and mechanical property are shown in table 6, table 7.The manufacturing technology steps of this submerged-arc welded (SAW) pipe is identical with embodiment 1, and the technological parameter during welding is as shown in table 8.What table 9 provided is the main chemical compositions of the weld metal of present embodiment; What table 10 provided is this submerged-arc welded (SAW) pipe main performance testing result in kind and the main performance requirement of X100 steel grade spiral seam submerged arc welded pipe; Visible by table, the submerged-arc welded (SAW) pipe that utilizes technology of the present invention to make has reached the specification requirement of X100 steel grade spiral seam submerged arc welded pipe.
The main chemical compositions of table 6 coiled sheet (wt.%)
| C | Mn | Si | P | S | V+Nb | Ni+Cr | Cr+Mo | CE IIW | CEpcm |
| +Ti | +Cu | +Mn | |||||||
| 0.05 | 1.95 | 0.25 | 0.013 | 0.001 | 0.13 | 1.0 | 2.5 | 0.52 | 0.22 |
Table 7 coiled sheet (30 ° of rolling directions) tension test value
| Yield strength Rt 0.5 (MPa) | Tensile strength Rm (MPa) | Yield tensile ratio Rt 0.5/Rm | Percentage elongation A50mm (%) | |
| Min | 700 | 800 | 0.85 | 31 |
| Max | 750 | 830 | 0.88 | 36 |
| Ave | 730 | 820 | 0.86 | 34 |
Table 8 Double Wire Welding parameter
The chemical composition of table 9 weld metal (wt.%)
| C | Mn | Si | P | S | V+Nb+T i | Ni+Cr+ Cu | Cr+Mo+ Mn |
| Outside weld | 0.048 | 2.04 | 0.33 | 0.016 | 0.001 | 0.07 | 0.72 | 2.53 |
| Inside weld | 0.049 | 2.06 | 0.36 | 0.015 | 0.001 | 0.07 | 0.71 | 2.52 |
Table 10 steel pipe mechanical property
Embodiment 3:
The main chemical compositions of the X100 roll of steel plate that present embodiment adopts and mechanical property are shown in table 11, table 12.The manufacturing technology steps of this submerged-arc welded (SAW) pipe is identical with embodiment 1, and the technological parameter during welding is as shown in table 13.What table 14 provided is the main chemical compositions of the weld metal of present embodiment; What table 15 provided is this submerged-arc welded (SAW) pipe main performance testing result in kind and the main performance requirement of X100 grade of steel pipeline steel tube; Visible by table, the submerged-arc welded (SAW) pipe that utilizes technology of the present invention to make has reached the specification requirement of X100 grade of steel pipeline steel tube.
The main chemical compositions of table 11 coiled sheet (wt.%)
| C | Mn | Si | P | S | V+Nb +Ti | Ni+Cr +Cu | Cr+Mo +Mn | CE IIW | CEpcm |
| 0.052 | 2.0 | 0.25 | 0.013 | 0.001 | 0.12 | 1.0 | 2.6 | 0.53 | 0.23 |
Table 12 coiled sheet (30 ° of rolling directions) tension test value
| Yield strength Rt 0.5 (MPa) | Tensile strength Rm (MPa) | Yield tensile ratio Rt 0.5/Rm | Percentage elongation A50mm (%) | |
| Min | 720 | 810 | 0.86 | ?30 |
| Max | 755 | 840 | 0.91 | ?36 |
| Ave | 735 | 825 | 0.88 | ?33 |
Table 13 Double Wire Welding parameter
The chemical composition of table 14 weld metal (wt.%)
| C | Mn | Si | P | S | V+Nb+Ti | Ni+Cr +Cu | Cr+Mo +Mn | |
| Outside weld | 0.048 | 2.06 | 0.36 | 0.016 | 0.001 | 0.07 | 0.72 | 2.53 |
| Inside weld | 0.049 | 2.05 | 0.34 | 0.015 | 0.001 | 0.07 | 0.70 | 2.52 |
Table 15 steel pipe mechanical property
Claims (6)
1. method for manufacturing high-strength X 100 steel grade spiral seam submerged arc welded pipe, the weight content of this spiral seam submerged-arc welding pipe main chemical compositions is: C 0.04～0.06%, and Si 0.20～0.30%, and Mn 1.8～2.0%, P≤0.015%; S≤0.003%, Cr≤0.40%, Ni≤0.50%, Cu≤0.30%; Mo≤0.40%, Ti≤0.020%, Nb≤0.10%, V≤0.06%; Al≤0.06%, N≤0.006%, B≤0.0005%, surplus is Fe; Pcm≤0.23% wherein, CE IIW 0.50～0.55%; The weight content of the main chemical compositions of weld seam is: C 0.04～0.06%, and Si 0.30～0.40%, and Mn 1.90～2.0%, P≤0.02%; S≤0.005%, Cr≤0.35%, Ni≤0.40%; Cu≤0.25%, Mo≤0.35%, Ti≤0.025%; Nb≤0.07%, V≤0.01%, surplus is an iron; The manufacturing procedure of this method comprises: uncoiling, leveling, mill limit, pre-bending, moulding, interior weldering, outside weld, pipe end hole enlargement, mother metal layering ultrasonic examination, weld seam X-ray examination, the water pressure test, weld joint ultrasonic inspection, pipe end chamfered edge, finished product inspection; It is characterized in that the technology of said interior welder's preface is: adopt the Lincoln weld of mariages tandem, first is direct current, its electric current I=1000～1200A, voltage V=31～33V; Second for exchanging its electric current I=430～470A, voltage V=35～37V; Distance between weldingwires d=10～14mm, welding speed V=1.4～1.6m/min.
2. a kind of method for manufacturing high-strength X 100 steel grade spiral seam submerged arc welded pipe according to claim 1 is characterized in that, said technology of milling the limit operation is milled limit technology for two: rough mill I type groove earlier; Finish-milling X type groove then, root face 6～8mm, 70 °～90 ° of bevel angles.
3. a kind of method for manufacturing high-strength X 100 steel grade spiral seam submerged arc welded pipe according to claim 1; It is characterized in that; The technology of said pre-bending operation is: adopt prebending machine to roll bending send the limit and free margins carries out the pre-bending limit, the pre-bending limit is of a size of radius 1470mm, length 100～130mm.
4. a kind of method for manufacturing high-strength X 100 steel grade spiral seam submerged arc welded pipe according to claim 1; The technology that it is characterized in that said outside weld operation is: adopt the Lincoln weld of mariages tandem; First is direct current, its electric current I=1100～1300A, voltage V=33～35V; Second for exchanging its electric current I=400～450A, voltage V=35～37V; Distance between weldingwires d=12～16mm, welding speed V=1.4～1.6m/min.
5. a kind of method for manufacturing high-strength X 100 steel grade spiral seam submerged arc welded pipe according to claim 1; It is characterized in that: weldering, outside weld technology all adopt high-toughness submerged arc welding solder flux and welding wire in said, and adopt tracking accuracy to reach the laser welded seam autotracker of 0.25mm.
6. according to described any one method for manufacturing high-strength X 100 steel grade spiral seam submerged arc welded pipe of claim 1-5; The technology that it is characterized in that said pipe end hole enlargement operation is: in pipe end 300mm scope, carry out cold hole enlargement, maximum hole enlargement amount is 0.6% of a diameter; Pipe end girth deviation ± 1.5mm, the ovality deviation is smaller or equal to 2mm.
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Address after: No. 102, East Ring Road, Qingxian County, Hebei Province Co-patentee after: Tubular Goods Research Center of China National Petroleum Corporation Patentee after: North China Petroleum Steel Pipe Co., Ltd. Co-patentee after: Benxi Steel Plate Co., Ltd. Co-patentee after: Shougang Group Co. Ltd. Address before: No. 102, East Ring Road, Qingxian County, Hebei Province Co-patentee before: Tubular Goods Research Center of China National Petroleum Corporation Patentee before: North China Petroleum Steel Pipe Co., Ltd. Co-patentee before: Benxi Steel Plate Co., Ltd. Co-patentee before: Capital Iron & Steel General Company |
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