CN103540867B - A kind of X80 level straight-line joint submerged arc welding tube of anti-H 2 S stress corrosion and manufacture method thereof - Google Patents

A kind of X80 level straight-line joint submerged arc welding tube of anti-H 2 S stress corrosion and manufacture method thereof Download PDF

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CN103540867B
CN103540867B CN201310470053.5A CN201310470053A CN103540867B CN 103540867 B CN103540867 B CN 103540867B CN 201310470053 A CN201310470053 A CN 201310470053A CN 103540867 B CN103540867 B CN 103540867B
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welding wire
welding
steel plate
steel
weld
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CN103540867A (en
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毕宗岳
牛辉
张万鹏
张锦刚
刘海璋
黄晓辉
赵红波
牛爱军
张君
陈长青
刘斌
包志刚
杨军
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China National Petroleum Corp
Baoji Petroleum Steel Pipe Co Ltd
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Baoji Petroleum Steel Pipe Co Ltd
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Abstract

The invention discloses a kind of X80 level straight-line joint submerged arc welding tube and manufacture method thereof of anti-H 2 S stress corrosion, straight-line joint submerged arc welding tube comprises weld seam and welded tube body, it is characterized in that: elementary composition by following mass percent of described welded tube body: C≤0.04, Si:0.20 ~ 0.40, Mn1.20 ~ 1.80, P≤0.008, S≤0.002, Ni0.10 ~ 0.30, Cr≤0.15, Cu≤0.15, Nb0.01 ~ 0.10, Ti0.01 ~ 0.10, Mo0.10 ~ 0.30, Al0.04 ~ 0.10, B≤0.0005, Ca≤0.002, all the other are iron and inevitable impurity.The present invention by the rational allocation of material composition, manufacturing process, manufacturing technology and subsequent disposal and control, X80 straight-line joint submerged arc welding tube is possessed good intensity, toughness, weldability, ductility and solidity to corrosion.Meet the high-pressure high-flow conveying requirement of sour environment oil gas.

Description

A kind of X80 level straight-line joint submerged arc welding tube of anti-H 2 S stress corrosion and manufacture method thereof
Technical field:
The invention belongs to welding field, relate to straight-line joint submerged arc welding tube and manufacture method thereof, especially a kind of X80 level straight-line joint submerged arc welding tube of anti-H 2 S stress corrosion and manufacture method thereof.
Background technology:
Hi-grade steel, Large Diameter Pipeline have become the general trend of pipeline steel tube development.Improve transportation work pressure, strengthen pipe diameter, can transport efficiency be improved, thus improve the economic benefit of pipeline operation.Along with China's natural gas industrial expansion, long distance pipeline construction will enter high-speed development period in the coming years, and Hi-grade steel pipe line steel is gathered around and had broad application prospects.The long distance pipeline Hi-grade steel pipe line steel that X80 pipe line steel is given priority to as China, has been widely used in China's pipework construction.
Long distance pipeline is under arms in process, and usually run into the strong corrosive mediums such as soil, crude oil or Sweet natural gas, wherein many is be on active service under the conditions such as high temperature, high pressure and high flow rate, and its etching problem seems more outstanding and serious.Long-distance transport pipes pass through desert, marsh and the complex area such as saline and alkaline, and pipeline external wall contacts with the corrosive medium in soil for a long time, inside has the delivery medium of deep-etching, and corrosion condition is very serious.The oil and gas sulphur content in the most of oil field of China is higher, the generation of a lot of pipeline accident all with H 2s is relevant.H 2s is one of hazardous medium with corrosive nature most in oil and natural gas, and seriously affect the work-ing life of oil gas pipeline, wherein hydrogen induced cracking (HIC) (HIC) and sulfide stress cracking (SSC) (SSCC) are H 2the principal mode of S acid attack, the safety that govern pipe-line is on active service.
Stress corrosion cracking (Stress Corrosion Cracking SCC) is metallic substance under the combined action of stress and corrosive medium, a kind of low stress brittle fracture phenomenon of generation.Stress corrosion cracking is that one does not have failure mode premonitory, and the loss caused is very huge.Along with the exploitation of severe cold areas oil-gas field and the raising of Cemented filling pressure and steel grade, the problem of pipeline generation brittle rupture is particularly outstanding.Pressure pipeline is as the typical welded construction of one, because welding process often makes the stress concentration that the structure property of welding joint is deteriorated and welding flaw place is serious, make welding flaw place become most weak part in whole welded pipe line, in military service process, often become the source of crackle.And cooling formation technic in tubulation process is improper, welded tube harmful residual stress also can be caused excessive, affect pipe safety.
Produce acid military service steel pipe development trend from external, low-carbon alloy steel pipe is from the eighties with X60 grade of steel, and it is main for being promoted to X65 to the nineties grade of steel, then develops into X70 grade of steel up till now.The companies such as Nippon Steel, JFE and Di Sen-Krupp can be mass and supply the corrosion-resistant pipeline steel tube of X70.Europe steel pipe has the developing history of nearly 30 years acid-resistant pipeline steel, within 2005, develops into X70 acid-resistant pipeline steel.Europe steel pipe mainly adopt be Ultra-low carbon, super low sulfur, low manganese, low-phosphorous Composition Design to reduce the segregation of the elements such as carbon, manganese, sulphur, phosphorus, make its performance meet the requirement of antiacid line pipe well by the microalloying of niobium, vanadium.Current external corrosion-resistant pipe line steel proportion of production is up to more than 65%.Domestic batch is used for on-the-spot resistance to H 2the welded tube of S corrosion is still X52 (L360).For a long time, domestic acid military service steel pipe adopts import steel pipe in a large number.In the existing technology of granted patent, what patent No. ZL201110297210.8 related to is a kind of X65MS grade of steel spiral welded tube and manufacture method thereof, spiral submerged welded pipe and the manufacture method thereof of what patent No. ZL201110331254.8 related to is a kind of X70MS grade of steel, it is 72% nominal stress that above two kinds of welded tube SSCC test loading stress level; What patent No. ZL00123185.5, ZL200710193032.8, ZL200910033695.2 related to is a kind of hydrothion corrosion resistant pipe steel; What patent No. ZL200610016498.6 related to is a kind of hydrogen sulfide corrosion resistant weldless steel tube; Thus, in current existing patented technology, do not relate to X80MS grade of steel, and possess straight-line joint submerged arc welding tube and the manufacture method thereof of anti-H 2 S stress corrosion ability.In addition, existing application is in publication file, and 201210026833.6 what relate to is a kind of high-strength seamless steel pipe; 201310177193.3 involved is a kind of weldless steel tube material and manufacture method thereof; 201310032759.3 involved is a kind of L360MS straight-line joint submerged arc welding tube and production method thereof; 201310150492.8 relate to a kind of acid-proof pipe welding wire for submerged-arc welding; 201310150513.6 relate to a kind of 80ksi level petroleum casing pipe and manufacture method thereof; 200310119050.3 relate to a kind of anti-H 2 S pipe line steel and production method thereof; 200410025443.2 what relate to is a kind of production method of anti-hydrogen sulfide steel.Thus existingly authorized or in publication technology, all do not related to 80ksi steel grade sulfur resistant hydrogen stress corrosion straight-line joint submerged arc welding tube and manufacture method thereof.
Along with " going into full operation and the arriving of Sino-Russian, Sino-Kazakhstan transnational oil and gas pipes upsurge in construction of West-east Gas natural gas line; oil-gas field is gradually to resource progress such as extremely frigid zones, sea and high sulfur-bearings; the security of gas pipeline use becomes the problem of academia's general concern, thus has higher requirement to pipeline material.
The concentration of hydrogen sulfide content contained in China's most of oil gas field is higher, and part gathering line belongs to acid attack environment, and the acid-proof pipe of the steel pipe of use mainly low strength X52 grade of steel, because intensity is low, cannot bear high-pressure high-flow conveying.Along with the intensity of pipe line steel increases, hardness generally increases.Because hardness and steel strength closely related, and H 2 S stress corrosion susceptibility is relevant with the hardness of steel, and hardness is higher, and susceptibility is larger.Thus along with oil gas pipeline steel strength, hardness raise, very easily there is SSCC, be therefore badly in need of exploitation corrosive environment high-strength X 80 acid resistance steel pipe.
Summary of the invention:
The object of the invention is to the shortcoming overcoming above-mentioned prior art, a kind of X80 level straight-line joint submerged arc welding tube and manufacture method thereof of anti-H 2 S stress corrosion are provided, by rational allocation and the control of material composition, manufacturing process, manufacturing technology and subsequent disposal, X80 straight-line joint submerged arc welding tube is possessed good intensity, toughness, weldability, ductility and solidity to corrosion.Meet the high-pressure high-flow conveying requirement of sour environment oil gas.
The technical problem to be solved in the present invention is to provide body high strength, possesses X80 steel-grade straight-line joint submerged arc welding tube and the manufacture method thereof of anti-H 2 S environmental stress corrosive nature simultaneously.
For solving the problems of the technologies described above, the invention provides a kind of X80 level straight-line joint submerged arc welding tube and manufacture method thereof of anti-H 2 S stress corrosion, main technical schemes is as follows:
A kind of X80 level straight-line joint submerged arc welding tube of anti-H 2 S stress corrosion and manufacture method thereof, the method comprises the following steps: steel plate milling limit, edges of boards pre-bending, steel pipe JCO are shaping, prewelding, interior weldering, outside weld, destressing are expanding, the water test, chamfered edge, retaining wall on slope, X-ray examination, ultrasound investigation, magnetic particle inspection, online spray mark and finished product inspection.
Described body is elementary composition by following mass percent: C≤0.04, Si:0.20 ~ 0.40, Mn1.20 ~ 1.80, P≤0.008, S≤0.002, Ni0.10 ~ 0.30, Cr≤0.15, Cu≤0.15, Nb0.01 ~ 0.10, Ti0.01 ~ 0.10, Mo0.10 ~ 0.30, Al0.04 ~ 0.10, B≤0.0005, Ca≤0.002, all the other are iron and inevitable impurity.
Described steel pipe seam is elementary composition by following mass percent: C0.02 ~ 0.08; Si0.2 ~ 0.5; Mn0.8 ~ 1.6; P≤0.015; S≤0.005; Cr≤0.30; Mo0.15 ~ 0.35; Al≤0.010; Ti0.01 ~ 0.10; B0.001 ~ 0.008; ; All the other are Fe and inevitable impurity.
Described steel plate is the high-purity controlled rolling steel plate that banded structure controls below 0.5 grade, and its metallographic microstructure is acicular ferrite, homogeneous microstructure, and grain fineness number is 12 grades or thinner.
The technique on described steel plate milling limit is two milling limits techniques, first rough mills I type groove, then finish-milling X-type groove, upper groove angle 70 ° ~ 110 °, lower groove angle 60 ° ~ 90 ° behind finish-milling limit, the high 6 ~ 8mm of root face.
The technique of described interior weldering is: adopt three union melt weldings groove inside steel pipe to weld, and the number one welding wire of interior weldering adopts DC reverse connection, and No. second welding wire, No. three welding wire adopt and exchange; Number one welding wire electric current 900 ± 100A, voltage 33 ± 1V; No. second welding wire electric current 750 ± 50A, voltage 35 ± 1V; No. three welding wire electric current 650 ± 50A, voltage 37 ± 1V; Welding speed is 1.6 ~ 1.8m/min.
The technique of described outside weld is: adopt three union melt weldings groove outside steel pipe to weld, and the number one welding wire of outside weld adopts DC reverse connection, and No. second welding wire, No. three welding wire adopt and exchange; Number one welding wire electric current 1150 ± 150A, voltage 33 ± 1V; No. second welding wire electric current 900 ± 100A, voltage 36 ± 1V; No. three welding wire electric current 600 ± 100A, voltage 39 ± 1V; Welding speed is 1.6 ~ 1.8m/min.
By above scheme, develop a kind of high-strength X 80 MS grade of steel hydrogen sulfide corrosion-resistant straight-line joint submerged arc welding tube, its manufacturing process technology comprises the following steps:
1) steel plate milling limit: choose steel plate, outside weld groove angle 70 ° ~ 110 °, lower groove angle 60 ° ~ 90 ° behind milling limit, the width of root face 6 ~ 8mm according to the diameter of Steel Pipe Design and thickness; , to obtain accurate steel plate width and bevel shape;
2) steel plate pre-bending; Steel plate transmission to crimp station, makes steel plate deformed reach the requirement of moulding process design radian by the extruding of upper and lower mould by charging stand;
3) steel plate JCO is shaping; To different wall, the steel pipe of different tube diameters, according to on-the-spot spring-go amount analysis of experiments, first by steel plate while use forming machine bending, make steel plate become " J " shape, then by its in addition symmetrical bending, steel plate cross section becomes " C " shape, finally steel plate is pressed into " O " shape in the middle part of steel plate, by reasonable set punching press number of times and punching press amount, there is after guaranteeing steel pipe forming good circularity and low unrelieved stress.
4) prewelding: prewelding adopts MAG welding process, carries out continuous welding complete joint close operation to pipe;
5) weldering in: adopt three union melt weldings groove inside steel pipe to weld, a welding wire of interior weldering adopts DC reverse connection, to ensure enough fusion penetrations.Second, third silk adopts and exchanges, attractive in appearance with the filling and welding bead that ensure weld seam;
6) outside weld: adopt three union melt weldings groove outside steel pipe to weld, the technique of outside weld operation is: adopt three union melt weldings groove inside steel pipe to weld, a welding wire of external welding adopts DC reverse connection, to ensure enough fusion penetrations.Second, third silk adopts and exchanges, attractive in appearance with the filling and welding bead that ensure weld seam;
7) welding wire adopts special high tenacity hydrogen sulfide corrosion-resistant welding wire;
8) solder flux adopts basic flux;
9) X-ray examination and ultrasound investigation for the first time: butt welded seam and heat affected zone are detected;
10) machinery expanding: it is expanding that the rear steel pipe of shaping, welding carries out total length, and enlarging rate is 0.6 ~ 1.4%;
11) water test: the water test is carried out to the steel pipe after expanding;
12) pipe end slope-mouth process: size is at steel pipe two ends finished edge as requested;
13) second time X-ray examination and ultrasound investigation: butt welded seam and heat affected zone are detected;
14) appearance and dimension check: as requested steel pipe apparent size is measured.
Adopt the know-why of above processing step as follows:
Raw material: the steel plate for the manufacture of welded tube adopts ultralow C, low Mn Composition Design, adopt high-purity smelting technology and inclusions class technology, strict control P, S impurity content, wherein less than 0.002 is controlled to S foreign matter content, thus greatly reduce the inclusion contents such as MnS, make sheet material homogeneous microstructure, high purity, banded segregation is few.Add the alloying elements such as a certain amount of Cr, Mo, reduce the subsurface defect such as element segregation, banded structure in material, reduce hydrogen atom and assemble forming core particle, improve the anti-H of sheet material 2s corrosive power, adds a certain amount of Nb, Ti microalloy element, crystal grain thinning, guarantees that sheet material has high obdurability.
Milling limit: specially designed groove size can optimize the penetration ratio of material in welding process, controls composition of weld line and heat affected zone performance, and the hardness at final guarantee welding joint position is no more than standard-required.Simultaneously preferred milling limit operation ensures that coiled sheet can through welding in welding process, and improve welding speed, improve seam center, reduce weld heat input as far as possible, reduce the impact of welding residual stress and thermal weld stress butt welded seam structure and properties, improve Weld Performance.
Steel plate pre-bending: steel plate is on roller-way after centering, and charging stand is by steel plate transmission to crimp station, and after pre-bending, steel plate straight side width is less than thickness of slab, makes steel plate deformed reach the requirement of moulding process design radian by the extruding of upper and lower mould.
JCO low-stress controls: in order to reduce JCO moulding stress, and JCO moulding stress is disperseed more in body circumference, and pressing process, by optimizing pressing process, adopts less step-length, reduces draught.First according to shaping steel tube size adjustment die forming machine, first steel plate is used forming machine bending, make steel plate become " J " shape, then by its symmetrical bending on one side in addition, steel plate cross section becomes " C " shape, finally steel plate is pressed into " O " shape in the middle part of steel plate.Wherein, punching press number of times, forming machine step-length and punching press amount design according to steel pipe sizes.Press the first piece two step comparatively light reduction, increase draught when forming curvature is inadequate more gradually and steel pipe is depressed into desired curvature, thus effectively control circumferential unrelieved stress.
Inside and outside astute and able: the selection of welding setting, take into full account the effect of each silk in three wire bonds, regulate the electric current of each silk, voltage, elongation, angle and silk spacing, guarantee the fusion penetration of weld seam and good seam center, in rational scope, select low heat input as far as possible, guarantee that weld seam has excellent toughness.
Adopt the hydrogen sulfide corrosion-resistant welding wire of new research and development, making up weld strength by adding Mo, Ti, B, improving solidity to corrosion again simultaneously.Mo is the most effective resistance to H 2s eroded elements, can together with S disperse educt, Mo 2c is also the trap of S.The combined action of Ti, B promotes the formation of tiny acicular ferrite in weld seam, guarantees that weld seam has hydrogen sulfide corrosion-resistant ability and obdurability.
Adopt alkaline hydrogen sulfide corrosion-resistant solder flux, coordinate special welding wire, better Weld Performance can be reached.What common pipe line steel solder flux was selected is common raw material, P, S impurity element is many, and hydrogen sulfide corrosion-resistant solder flux to select be all high cleanliness raw material, the impurity such as P, S content in solder flux are all lower, so P, S content be transitioned in welding process in weld seam is low, decrease the convergence point of hydrogen, enhance resistance to HIC and the SSCC ability of weld seam.Weld after proportioning raw material, solder flux slag detachability, arc-stabilising, formability and the out gassing etc. developed are all very excellent.
Weld seam soft controls: for improving the anti-SSCC ability of high-strength X 80 MS straight-line joint submerged arc welding tube, in welding process, need butt welded seam hardness strictly to control, Hardness Control is mainly carried out from welding material and weldprocedure two aspects.Reduce Mn, Si and alloy equal size in hydrogen sulfide corrosion-resistant wlding all as far as possible, avoid these elements to be too much transitioned in weld seam in welding process, cause weld hardness to raise.According to thickness of slab, regulate the electric current of each silk in welding process, voltage, elongation, angle and silk spacing, t8/5 is controlled within the scope of 18 ~ 25s, the formation of thick hardened structure can be reduced.
Expanding technology: according to the size and dimension of shaping rear steel pipe, determines best expanding technology, discharges stress in mother metal and weld seam, reduces stress concentration, and prevention SSCC occurs, and after guaranteeing pipe expanding, size, shape and performance meet the demands.
The water test: carry out the water test, the intensity of inspection steel pipe and tightness, discharge stress further.
Beneficial effect of the present invention is: X80 straight-line joint submerged arc welding tube of the present invention has possessed good intensity, toughness, weldability, ductility and solidity to corrosion, meets the high-pressure high-flow conveying requirement of sour environment oil gas.
Embodiment:
Embodiment 1: Ф 813 × 15.3mmX80MS grade of steel hydrogen sulfide corrosion-resistant straight-line joint submerged arc welding tube manufactures
1) raw material
Employing wall thickness is the X80MS steel plate of 15.3mm, and its chemical composition analysis is as following table 1:
Table 1X80MS chemical composition analysis (%)
C Si Mn P S Cr Cu Ni Mo Nb Ti Al B Ca
0.032 0.29 1.59 0.007 0.0009 0.09 0.11 0.17 0.22 0.06 0.07 0.07 0.0003 0.0008
2) steel plate milling limit and pre-bending: upper groove angle 80 °, lower groove angle 75 ° behind milling limit, width of root face 6mm;
3) on roller-way, after centering, steel plate deformed is made to reach the requirement of moulding process design radian by the extruding of upper and lower mould to the steel plate after milling limit;
4) steel plate JCO is shaping; Adopt drawing method progressively, forming curvature R388.2mm, is first pressed into " J " type by the half of steel plate through 9 times, adopt the same method and carry out second half through 9 compactings, become " C " type, forming machine step-length 114.8mm, is finally pressed into " O " type in the centre of steel plate.Whole compacting number of channels 19 road, each draught 3 ~ 1mm; Less step-length, more compacting number of times reduces unrelieved stress;
5) prewelding: prewelding adopts MAG welding process, carries out continuous welding complete joint close operation to pipe;
6) weldering in: adopt three union melt weldings groove inside steel pipe to weld.Weldprocedure: number one welding wire electric current 900A, voltage 33V; No. second welding wire electric current 750A, voltage 35V; No. three welding wire electric current 650A, voltage 37V; Welding speed is 1.70m/min; Welding material adopts welding wire and the solder flux of research and development;
7) outside weld: adopt three union melt weldings groove outside steel pipe to weld.Weldprocedure: number one welding wire electric current 1000A, voltage 34V; No. second welding wire electric current 750A, voltage 37V; No. three welding wire electric current 550A, voltage 40V; Welding speed is 1.70m/min;
8) machinery expanding: it is expanding that the rear steel pipe of shaping, welding carries out total length 1.0%, guarantees the shape of pipe, improve the stress distribution of steel pipe;
9) water test: carry out hydrostatic test to the steel pipe after expanding, test pressure is 20.7Mpa, and the dwell time is greater than 15s;
10) pipe end slope-mouth process: pipe end is processed, groove angle is 22 ° ~ 25 °, and root face is 1.6 ± 0.8mm;
11) ultrasonic testing: second time 100% ultrasound examination is carried out in butt welded seam and heat affected zone, for detecting defect that is expanding, hydraulic pressure generation;
12) X-ray examination: steel pipe inner and outer welding is carried out to industrial television inspection and the pipe end film making of 100%, for detecting defect that is expanding, hydraulic pressure generation;
13) appearance and dimension check: as requested steel pipe apparent size is measured;
Steel pipe physics and chemistry and corrosion resisting property as follows:
1) transverse tensile property
Table 2 cross tensile test result
2) Charpy impact toughness, DWTT and pliability test result
Table 3 impacts, DWTT and pliability test result
3) welding joint Vickers' hardness
Table 4 mother metal, Seam and heat effected zone Vickers' hardness (HV 10)
4) corrosion resisting property test
Table 5 acid-proof pipe HIC sensitive parameter test result
Test piece number (Test pc No.) CSR(%) CLR(%) CTR(%)
Mother metal 0,0,0 0,0,0 0,0,0
Weld seam 0,0,0 0,0,0 0,0,0
Heat affected zone 0,0,0 0,0,0 O,0,0
API requirement ≤2 ≤15 ≤5
Table 6 button SSCC test result
Embodiment 2: Ф 813 × 17.5mm X80MS grade of steel hydrogen sulfide corrosion-resistant straight-line joint submerged arc welding tube manufactures
1) raw material
Employing wall thickness is the X80MS steel plate of 17.5mm, and its chemical composition analysis is as following table:
Table 7:X80MS chemical composition analysis
C Si Mn P S Cr Cu Ni Mo Nb Ti Al B Ca
0.032 0.30 1.58 0.007 0.0009 0.09 0.12 0.17 0.23 0.06 0.07 0.06 0.0003 0.0007
2) steel plate milling limit and pre-bending: upper groove angle 100 °, lower groove angle 80 ° behind milling limit, width of root face 8mm;
3) on roller-way, after centering, steel plate deformed is made to reach the requirement of moulding process design radian by the extruding of upper and lower mould to the steel plate after milling limit;
4) steel plate JCO is shaping: adopt drawing method progressively, forming curvature R386.2mm, first the half of steel plate is pressed into " J " type through 9 times, adopt the same method and carry out second half through 9 compactings, become " C " type, forming machine step-length 114.2mm, is finally pressed into " O " type in the centre of steel plate.Whole compacting number of channels 19 road, each draught 3 ~ 1mm.Less step-length, more compacting number of times reduces unrelieved stress;
5) prewelding: prewelding adopts C0 2welding process, carries out continuous welding to pipe and completes joint close operation;
6) weldering in: adopt three union melt weldings groove inside steel pipe to weld.Weldprocedure: number one welding wire electric current 960A, voltage 33.5V; No. second welding wire electric current 750A, voltage 35.5V; No. three welding wire electric current 650A, voltage 37V; Welding speed is 1.7m/min; Welding material adopts high-toughness welding wire and the solder flux of research and development;
7) outside weld: adopt three union melt weldings groove outside steel pipe to weld.Weldprocedure: number one welding wire electric current 1100A, voltage 34V; No. second welding wire electric current 850A, voltage 37V; No. three welding wire electric current 700A, voltage 40V; Welding hastens as 1.7m/min; Welding material adopts high-toughness welding wire and the solder flux of research and development;
8) machinery expanding: it is expanding that the rear steel pipe of shaping, welding carries out total length 1.0%, guarantees the shape of pipe, improve the stress distribution of steel pipe;
9) water test: carry out hydrostatic test to the steel pipe after expanding, test pressure is 23.9Mpa, and the dwell time is greater than 15s;
10) pipe end slope-mouth process: pipe end is processed, groove angle is 22 ° ~ 25 °, and root face is 1.6 ± 0.8mm;
11) ultrasonic testing: second time 100% ultrasound examination is carried out in butt welded seam and heat affected zone, for detecting defect that is expanding, hydraulic pressure generation;
12) X-ray examination: steel pipe inner and outer welding is carried out to industrial television inspection and the pipe end film making of 100%, for detecting defect that is expanding, hydraulic pressure generation;
13) appearance and dimension check: as requested steel pipe apparent size is measured;
Steel pipe physics and chemistry and corrosion resisting property as follows:
1) transverse tensile property
Table 8 cross tensile test result
2) Charpy impact toughness, DWTT and pliability test result
Table 9 impacts, DWTT and pliability test result
3) welding joint Vickers' hardness
Table 10 mother metal, Seam and heat effected zone Vickers' hardness (HV 10)
4) corrosion resisting property test
Table 11 acid-proof pipe HIC sensitive parameter test result
Test piece number (Test pc No.) CSR(wt) CLR(wt) CTR(wt)
Mother metal 0,0,0 0,0,0 0,0,0
Weld seam 0,0,0 0,0,0 0,0,0
Heat affected zone 0,0,0 0,0,0 0,0,0
API requirement ≤2 ≤15 ≤5
Table 12 button SSCC test result
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when the method and technology contents that can utilize above-mentioned announcement are made a little change or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, still belong in the scope of technical solution of the present invention.

Claims (4)

1. an X80 level straight-line joint submerged arc welding tube for anti-H 2 S stress corrosion, comprises weld seam and welded tube body, it is characterized in that: elementary composition by following mass percent of described welded tube body: C≤0.04, Si:0.20 ~ 0.40, Mn1.20 ~ 1.80, P≤0.008, S≤0.002, Ni0.10 ~ 0.30, Cr≤0.15, Cu≤0.15, Nb0.01 ~ 0.10, Ti0.01 ~ 0.10, Mo0.10 ~ 0.30, Al0.04 ~ 0.10, B≤0.0005, Ca≤0.002, all the other are iron and inevitable impurity; Described welded tube is made up of steel plate, and steel plate is the high-purity controlled rolling steel plate that banded structure controls below 0.5 grade, and the metallographic microstructure of steel plate is acicular ferrite, homogeneous microstructure, and grain fineness number is 12 grades or thinner; Described welded tube welding seam is elementary composition by following mass percent: C0.02 ~ 0.08; Si0.2 ~ 0.5; Mn0.8 ~ 1.6; P≤0.015; S≤0.005; Cr≤0.30; Mo0.15 ~ 0.35; Al≤0.010; Ti0.01 ~ 0.10; B0.001 ~ 0.008; All the other are Fe and inevitable impurity.
2. the manufacture method of X80 level straight-line joint submerged arc welding tube as claimed in claim 1, it is characterized in that, comprise the following steps: steel plate milling limit, edges of boards pre-bending, steel pipe JCO are shaping, prewelding, interior weldering, outside weld, destressing are expanding, the water test, chamfered edge, retaining wall on slope, X-ray examination, ultrasound investigation, magnetic particle inspection, online spray mark and finished product inspection; The technique on described steel plate milling limit is two milling limits techniques, first rough mills I type groove, then finish-milling X-type groove, upper groove angle 70 ° ~ 110 °, lower groove angle 60 ° ~ 90 ° behind finish-milling limit, the high 6 ~ 8mm of root face.
3. manufacture method as claimed in claim 2, it is characterized in that, the technique of described interior weldering is: adopt three union melt weldings groove inside steel pipe to weld, and the number one welding wire of interior weldering adopts DC reverse connection, and No. second welding wire, No. three welding wire adopt and exchange; Number one welding wire electric current 900 ± 100A, voltage 33 ± 1V; No. second welding wire electric current 750 ± 50A, voltage 35 ± 1V; No. three welding wire electric current 650 ± 50A, voltage 37 ± 1V; Welding speed is 1.6 ~ 1.8m/min.
4. manufacture method as claimed in claim 2, it is characterized in that, the technique of described outside weld is: adopt three union melt weldings groove outside steel pipe to weld, and the number one welding wire of outside weld adopts DC reverse connection, and No. second welding wire, No. three welding wire adopt and exchange; Number one welding wire electric current 1150 ± 150A, voltage 33 ± 1V; No. second welding wire electric current 900 ± 100A, voltage 36 ± 1V; No. three welding wire electric current 600 ± 100A, voltage 39 ± 1V; Welding speed is 1.6 ~ 1.8m/min.
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