CN102205458B - Manufacturing method for X120 steel-level spiral seam hidden arc welding tube - Google Patents
Manufacturing method for X120 steel-level spiral seam hidden arc welding tube Download PDFInfo
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Abstract
The invention discloses a manufacturing method for an X120 steel-level spiral seam hidden arc welding tube. The contents of various chemical components of the spiral seam hidden arc welding tube are optimally designed and a trace B element is added. The manufacturing method comprises the following steps: uncoiling; flattening; milling edges; pre-bending; molding; internally welding and externally welding, or pre-finishing welding; layering a mother plate; performing ultrasonic flaw detection on a welding joint and X-ray flaw detection on the welding joint; expanding a tube end; testing a water pressure; performing ultrasonic flaw detection on the welding joint; performing X-ray flaw detection on the tube end; chamfering the tube end; and checking an end-product. The strength of the high-intensity spiral seam hidden arc welding tube manufactured by using the method is greatly increased, the molding stability in manufacturing process is greatly increased and the production cost is efficiently lowered.
Description
Technical field
The present invention relates to a kind of spiral seam submerged-arc welding pipe and manufacturing technology thereof, as petroleum gas delivering pipe, the especially manufacturing approach of high strength X120 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 X100 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 X120 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; Along with the raising of grade of steel, especially arrive X120 superhigh intensity grade of steel, counter stress is concentrated with the control of residual stress responsive more; 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 manufacturing approach of X120 steel grade spiral seam submerged arc welded pipe, adopts the spiral seam submerged-arc welding pipe body intensity of this method manufacturing to improve greatly, and production cost reduces.
For solving the problems of the technologies described above, technical scheme provided by the present invention is: a kind of manufacturing approach of X120 steel grade spiral seam submerged arc welded pipe, and the weight percentage of this spiral seam submerged-arc welding pipe body main chemical compositions is: C 0.035～0.055%, and Si 0.20～0.25%; Mn 1.9～2.0%, P≤0.010%, and S≤0.002%, Ni 0.35～0.45%; Cr, Cu and Mo are 0.2～0.3%, and Nb 0.07～0.09%, and V 0.03～0.04%, and Ti 0.01～0.016%; Al0.03～0.05%, N≤0.006%, B 0.0008～0.001%; Surplus is Fe, and wherein CEpcm 0.20～0.22%, CE
II W0.52～0.54%; The manufacturing procedure of this manufacturing approach comprises: uncoiling, and leveling mills the limit, pre-bending, moulding; Interior weldering and outside weld or astute and able in advance, mother metal layering and weld seam supersonic detection and weld seam x-ray inspection, pipe end hole enlargement, the water pressure test; Weld seam supersonic detection, pipe end x-ray inspection, pipe end chamfered edge, finished product inspection; Said preparatory astute and able operation comprises: prewelding, and prewelding is repaired, and draws the welding of blow-out plate, and the cutting of blow-out plate is drawn in interior weldering and outside weld.Weldering and outside weld technology in adopting during wherein above-mentioned welding step, perhaps adopt preparatory astute and able technology all can, two kinds of a kind of getting final product of methods selection.
The control welded tube is pouted one's lips≤1.0mm in the above-mentioned pre-bending operation; Control misalignment≤1.0mm in the molding procedure; Residual stress control allowed maximum spring-go value≤Sha Ercijite calculated value when weldering was with outside weld in adopting, when employing preparatory when astute and able residual stress control≤1.5 times of Sha Ercijite calculated values.
The technology of above-mentioned prewelding is: weldering speed 2.5～3.5 m/min, gage of wire 2.5mm, welding current 560～600A, voltage V=26～28V; The solder flux and the welding wire of high strength and high tenacity all adopted in weldering and outside weld in said; Its process using mariages tandem Lincoln weld, wherein the technology of interior weldering is: first is direct current, its electric current I=950～1150A, voltage V=31～33V; Second for exchanging; Its electric current I=430～470A, voltage V=35～37V, distance between weldingwires d=12～16mm, welding speed V=1.4～1.6m/min; Said outside weld technology is: first is direct current, its electric current I=1050～1250A, voltage V=33～35V, and second for exchanging; Its electric current I=400～450A, voltage V=35～37V; Distance between weldingwires d=14～18mm, welding speed V=1.4～1.6m/min, root face is of a size of 4～6mm; 70 °～90 ° of bevel angles, weld reinforcement 1～2mm; The weight percentage of the main chemical compositions of weld seam is controlled as follows: B 0.001～0.002%, and C 0.04～0.06%, and Si 0.30～0.40%; Mn 1.90～2.1%, P≤0.015%, S≤0.005%; N≤0.009%, Ti, Al and V 0.02～0.03%, Nb0.04～0.07%; Cr and Cu 0.2～0.3%, Mo and Ni0.3～0.4%, all the other are Fe.
The inventive method is compared with the technology of existing processing spiral seam submerged-arc welding pipe and is mainly reflected in following aspect:
Optimized the root face size: root face 4～6mm, 70 °～90 ° of bevel angles have reduced the root face size, reduce weld heat input, reduce the sweating heat input to welding heat affected zone tissue and Effect on Performance, improve the performance of weld heat-affected zone.
The technology of 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 680mm, length 100～130mm, pouts one's lips≤1.0mm to guarantee welded tube.
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 X120 grade of steel pipe line steel of F1420 * 15.3mm,, be optimized to shape parameter, effectively eliminated forming defects such as misalignment, steel pipe moulding welding quality is improved significantly through means such as setting-out, analysis on elasticity.Guarantee moulding control misalignment≤1.0mm, residual stress control allows maximum spring-go value≤Sha Ercijite calculated value, preparatory≤1.5 times of Sha Ercijite calculated values of residual stress control when astute and able.
Because the mother metal that steel tube place uses is low-carbon microalloyed high strength steel, its carbon equivalent ce II W has reached more than 0.52%, has 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.Adopt interior outside weld 1 wire bond of reduction to connect electric current, reduce hot input quantity, the control crystallite dimension guarantees impact flexibility; Fully exhaust, deslagging obtain good weld shape, good quality.Through constantly groping, confirm that prewelding technology is: weldering speed 2.5～3.5 m/min, gage of wire 2.5mm, welding wire trade mark JTL-80 welding current 560～600A, voltage V=26～28V; Interior welder's skill is: adopt the Lincoln weld of mariages tandem, first is direct current, its electric current I=950～1150A, 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.Outside weld technology is: adopt the Lincoln weld of mariages tandem, first is direct current, its electric current I=1050～1250A, 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.In the actual production, adopt first mixed gas arc welding prewelding, the inside and outside more astute and able preparatory astute and able method of submerged-arc welding concentrates the weld crack that causes with the residual stress sensitivity that good effect is arranged to eliminating superhigh intensity X120 grade of steel counter stress.
Adopt above-mentioned technology; Comprehensive mother metal, welding wire and solder flux chemical composition property of welded joint require scientific and reasonable coupling; In weldering, outside weld technology all adopts high strength, high tenacity, and the solder technology that is complementary with X120 grade of steel roll bending, welding parameter, groove size, submerged arc flux and welding wire, thus reduce hot input quantity, stress is concentrated; The composition of control weld seam makes Weld Performance reach the performance requirement of X120.The main component of weld seam is in following scope (weight): B 0.001～0.002%, and C 0.04～0.06%, and Si 0.30～0.40%; Mn 1.90～2.1%, P≤0.015%, S≤0.005%; N≤0.009%, Ti, Al and V 0.02～0.03%, Nb0.04～0.07%; Cr and Cu 0.2～0.3%, Mo and Ni0.3～0.4%, all the other are Fe.The metallographic structure that welding back weld seam obtains is main with bainite, thereby guarantees that the weld(ing) deposit has high intensity and toughness cooperation and inherent quality and physicochemical property.
Adopt the beneficial effect that technique scheme produced to be: manufacturing approach of the present invention is compared with the common spiral seam submerged-arc welding pipe of manufacturing; It at first is the body chemical composition of having optimized the spiral submerged arc welded welded tube; Adopt the alloy system that adds the B of trace, improved body intensity greatly, reduced alloy content; Not only can reduce production costs, and can effectively improve the weldability of superhigh intensity pipe line steel.Next is to have optimized pre-bending, moulding and welding procedure, effectively reduces the welding point misalignment, pouts one's lips, the welded tube residual stress, weld reinforcement, sweating heat input quantity; Crystallite dimension; Welding parameter and welding material coupling is more scientific and reasonable, successful solution high-intensity X120 steel grade spiral seam submerged arc welded pipe manufacture in forming stability poor, sweating heat input quantity, stress are concentrated and residual stress sensitivity more; Welding point is easy to generate crackle; Crystal grain is thick, and welding point guided bend cracking, impact flexibility and tensile strength are low, are difficult to satisfy technical barriers such as specification requirement.
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 X120 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 F1420mm.The manufacturing technology steps of this submerged-arc welded (SAW) 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 5mm, bevel angle are 35 ° groove, and the butt joint back, two limits of steel plate forms 70 ° double V grooves;
3, pre-bending: on two roller joggling machines to roll bending send the limit and free margins carries out the pre-bending limit, making radius size is 680mm; Length 100～130mm pouts one's lips≤1.0mm;
4, moulding: the band steel that will pass through above-mentioned pre-bending limit rolls into the helical form cylinder that diameter is F1016mm at the three-roll formation device, misalignment≤1.0mm, and residual stress control allows maximum spring-go value≤100mm, preparatory residual stress control≤150mm when astute and able;
5, welding: carry out interior weldering and outside weld along the seam of steel pipe cylinder, welding condition such as table 3 and 4, the main chemical compositions such as the table 5 of weld seam, mechanical property such as table 7, weld reinforcement 1～2mm recommends to adopt preparatory astute and able method;
7, flaw detection: mother metal layering and weld joint ultrasonic inspection, weld seam X-ray examination;
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, and ovality deviation ± 2mm, extension diameter section should seamlessly transit with extension diameter section not;
8, the water pressure test;
9, butt welded seam carries out ultrasonic examination and pipe end x-ray inspection;
10, pipe end chamfered edge: the end seamed edge to steel pipe carries out abate;
11, finished product inspection.
Table 6 provides is the steel pipe of the present embodiment 1 main performance testing result in kind and the main performance requirement of X120 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 X120 steel grade spiral seam submerged arc welded pipe.
The main chemical compositions of table 1 coiled sheet (wt.%, weight percentage)
| C | Mn | Si | P | S | B | V+Nb+Ti | Ni+Cr+Cu | Cr+Mo+Mn | CE ⅡW | CEpcm |
| 0.048 | 1.96 | 0.24 | 0.010 | 0.001 | 0.0009 | 0.13 | 0.9 | 2.5 | 0.53 | 0.21 |
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 (%) |
| Ave | 990 | 1100 | 0.90 | 26 |
Table 3 prewelding parameter
| Weldering speed (m/min) | Gage of wire (mm) | The welding wire trade mark | Welding current (A) | Arc voltage (V) |
| 2.5 | 2.5 | JTL-80 | 560 | 26 |
Table 4 Double Wire Welding parameter
The main chemical compositions of table 5 weld metal (wt.%)
| ? | B | C | Mn | Si | P | S | V+Nb+Ti | Ni+Cr+Cu | Cr+Mo+Mn |
| Weld seam | 0.0016 | 0.06 | 2 | 0.33 | 0.01 | 0.001 | 0.095 | 0.85 | 2.60 |
Table 6 steel pipe mechanical property
DWTT: standard-required: test temperature: 0 ℃, monodrome >=70%, mean value >=85%; Actual value: monodrome 100%, mean value 100%;
Embodiment 2:
The main chemical compositions of the X120 grade of steel coiled sheet that the present embodiment submerged-arc welded (SAW) pipe adopts and mechanical property are shown in table 7, table 8, and the thickness of steel plate is 15.3mm, and the external diameter of steel pipe is F1420mm.The manufacturing technology steps of steel pipe is identical with embodiment 1, and the technological parameter during welding is shown in table 9 and 10.What table 11 provided is the main chemical compositions of the weld metal of present embodiment; What table 12 provided is the steel pipe main performance testing result in kind and the main performance requirement of X120 steel grade spiral seam submerged arc welded pipe; Visible by table, the spiral welded pipe that utilizes technology of the present invention to make has reached the specification requirement of X120 steel grade spiral seam submerged arc welded pipe.
The main chemical compositions of table 7 coiled sheet (wt.%)
| C | Mn | Si | P | S | B | V+Nb+Ti | Ni+Cr+Cu | Cr+Mo+Mn | CE ⅡW | CEpcm |
| 0.04 | 1.90 | 0.25 | 0.008 | 0.001 | 0.0008 | 0.12 | 0.85 | 2.45 | 0.52 | 0.20 |
Table 8 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 (%) |
| Ave | 880 | 1000 | 0.88 | 30 |
Table 9 prewelding parameter
| Weldering speed (m/min) | Gage of wire (mm) | The welding wire trade mark | Welding current (A) | Arc voltage (V) |
| 3.0 | 2.5 | JTL-80 | 580 | 27 |
Table 10 Double Wire Welding parameter
The main chemical compositions of table 11 weld metal (wt.%)
| ? | B | C | Mn | Si | P | S | V+Nb+Ti | Ni+Cr+Cu | Cr+Mo+Mn |
| Weld seam | 0.0017 | 0.06 | 2.1 | 0.33 | 0.013 | 0.001 | 0.09 | 0.9 | 2.7 |
Table 12 steel pipe mechanical property
DWTT: standard-required: test temperature: 0 ℃, monodrome >=70%, mean value >=85%; Actual value: monodrome 94%, mean value 96%;
Embodiment 3:
The main chemical compositions of the X120 roll of steel plate that present embodiment adopts and mechanical property are shown in table 13, table 14, and the thickness of steel plate is 15.3mm, and the external diameter of steel pipe is F1420mm.The manufacturing technology steps of steel pipe is identical with embodiment 1, and the technological parameter during welding is shown in table 15 and 16.What table 17 provided is the main chemical compositions of the weld metal of present embodiment; What table 18 provided is the steel pipe main performance testing result in kind and the main performance requirement of X120 grade of steel pipeline steel tube; Visible by table, the spiral welded pipe that utilizes technology of the present invention to make has reached the specification requirement of X120 grade of steel pipeline steel tube.
The main chemical compositions of table 13 coiled sheet (wt.%)
| C | Mn | Si | P | S | B | V+Nb+Ti | Ni+Cr+Cu | Cr+Mo+Mn | CE ⅡW | CEpcm |
| 0.05 | 2.0 | 0.25 | 0.006 | 0.001 | 0.001 | 0.14 | 0.95 | 2.55 | 0.54 | 0.22 |
Table 14 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 (%) |
| Ave | 930 | 1050 | 0.89 | 28 |
Table 15 prewelding parameter
| Weldering speed (m/min) | Gage of wire (mm) | The welding wire trade mark | Welding current (A) | Arc voltage (V) |
| 3.5 | 2.5 | JTL-80 | 600 | 28 |
Table 16 Double Wire Welding parameter
The main chemical compositions of table 17 weld metal (wt.%)
| ? | B | C | Mn | Si | P | S | V+Nb+Ti | Ni+Cr+Cu | Cr+Mo+Mn |
| Weld seam | 0.0015 | 0.06 | 1.9 | 0.35 | 0.015 | 0.001 | 0.1 | 0.8 | 2.5 |
Table 18 steel pipe mechanical property
DWTT: standard-required: test temperature: 0 ℃, monodrome >=70%, mean value >=85%; Actual value: monodrome 100%, mean value 100%;
Adopt this manufacturing approach through a large amount of experiment proof, can both produce the technique effect of expection, the X120 steel grade spiral seam submerged arc welded pipe of production superhigh intensity is had good directive function.
Claims (2)
1. the manufacturing approach of an X120 steel grade spiral seam submerged arc welded pipe, the weight percentage of this spiral seam submerged-arc welding pipe body main chemical compositions is: C 0.035～0.055%, and Si 0.20～0.25%, and Mn 1.9～2.0%; P≤0.010%, S≤0.002%, Ni 0.35～0.45%, and Cr, Cu and Mo are 0.2～0.3%; Nb 0.07～0.09%, and V 0.03～0.04%, and Ti 0.01～0.016%; Al0.03～0.05%, N≤0.006%, B 0.0008～0.001%; Surplus is Fe, and wherein CEpcm 0.20～0.22%, CE
II W0.52～0.54%; It is characterized in that: the manufacturing procedure of this manufacturing approach comprises: uncoiling, and leveling mills the limit, pre-bending; Moulding, interior weldering and outside weld or astute and able in advance, mother metal layering and weld seam supersonic detection and weld seam x-ray inspection; The pipe end hole enlargement, the water pressure test, weld seam supersonic detection; The pipe end x-ray inspection, pipe end chamfered edge, finished product inspection; Said preparatory astute and able operation comprises: prewelding, and prewelding is repaired, and draws the welding of blow-out plate, and the cutting of blow-out plate is drawn in interior weldering and outside weld; The control welded tube is pouted one's lips≤1.0mm in the said pre-bending operation; Control misalignment≤1.0mm in the molding procedure; Residual stress control allowed maximum spring-go value≤Sha Ercijite calculated value when weldering was with outside weld in adopting, when employing preparatory when astute and able residual stress control≤1.5 times of Sha Ercijite calculated values.
2. the manufacturing approach of X120 steel grade spiral seam submerged arc welded pipe according to claim 1 is characterized in that: the technology of said prewelding is: weldering speed 2.5～3.5 m/min, gage of wire 2.5mm, welding current 560～600A, voltage V=26～28V; The solder flux and the welding wire of high strength and high tenacity all adopted in weldering and outside weld in said; Its process using mariages tandem Lincoln weld, wherein the technology of interior weldering is: first is direct current, its electric current I=950～1150A, voltage V=31～33V; Second for exchanging; Its electric current I=430～470A, voltage V=35～37V, distance between weldingwires d=12～16mm, welding speed V=1.4～1.6m/min; Said outside weld technology is: first is direct current, its electric current I=1050～1250A, voltage V=33～35V, and second for exchanging; Its electric current I=400～450A, voltage V=35～37V; Distance between weldingwires d=14～18mm, welding speed V=1.4～1.6m/min, root face is of a size of 4～6mm; 70 °～90 ° of bevel angles, weld reinforcement 1～2mm; The weight percentage of the main chemical compositions of weld seam is controlled as follows: B 0.001～0.002%, and C 0.04～0.06%, and Si 0.30～0.40%; Mn 1.90～2.1%, P≤0.015%, S≤0.005%; N≤0.009%, Ti, Al and V 0.02～0.03%, Nb0.04～0.07%; Cr and Cu 0.2～0.3%, Mo and Ni0.3～0.4%, all the other are Fe.
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Address after: 300000 building 3, Tianjin Binhai Service Outsourcing Industrial Park, 19 West Road, Tanggu, Tianjin. Co-patentee after: North China Petroleum Steel Pipe Co., Ltd. Patentee after: CNPC Bohai Equipment Manufacturing Co., Ltd. Co-patentee after: Shougang Group Co. Ltd. Address before: 300000 building 3, Tianjin Binhai Service Outsourcing Industrial Park, 19 West Road, Tanggu, Tianjin. Co-patentee before: North China Petroleum Steel Pipe Co., Ltd. Patentee before: CNPC Bohai Equipment Manufacturing Co., Ltd. Co-patentee before: Capital Iron & Steel General Company |