CN103556054B - A kind of high strength medium caliber heavy wall Submarine linepipe and manufacture method thereof - Google Patents

A kind of high strength medium caliber heavy wall Submarine linepipe and manufacture method thereof Download PDF

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CN103556054B
CN103556054B CN201310478954.9A CN201310478954A CN103556054B CN 103556054 B CN103556054 B CN 103556054B CN 201310478954 A CN201310478954 A CN 201310478954A CN 103556054 B CN103556054 B CN 103556054B
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welding
electric current
voltage
steel pipe
manufacture
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CN103556054A (en
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毕宗岳
牛爱军
牛辉
张锦刚
张万鹏
刘海璋
黄晓辉
赵红波
张君
刘斌
陈长青
杨军
包志刚
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China Petroleum and Natural Gas Co Ltd
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 high strength medium caliber heavy wall Submarine linepipe and manufacture method thereof, according to mass percent, the Chemical Composition of Submarine linepipe is C0.04% ~ 0.08%, Si0.20% ~ 0.35%, Mn1.40% ~ 1.65%, P≤0.015%, S≤0.003%, Ni≤0.30%, Cr≤0.10% ~ 0.30%, Cu≤0.25%, Mo≤0.35%, Nb0.02% ~ 0.060%, V≤0.06%, Ti0.008% ~ 0.030%, Al0.015% ~ 0.050%, N≤0.01%, B≤0.0005%, Al/N >=3, Nb+V+Ti≤0.12%, surplus is iron and inevitable impurity, its carbon equivalent Ceq≤0.43, cold crack FACTOR P cm≤0.22, subsea pipeline X70 grade of steel medium caliber thick walled steel tube vertical transverse strength of the present invention, toughness, body and the excellent combination property such as welding seam breaking toughness and corrosion resistance nature.

Description

A kind of high strength medium caliber heavy wall Submarine linepipe and manufacture method thereof
Technical field:
The invention belongs to gas and oil in sea development field, relate to a kind of sea-bottom oil-gas pipeline high strength medium caliber heavy wall submerged pipeline straight-line joint submerged arc welding tube and manufacture method thereof, especially there is good transverse and longitudinal obdurability, a plasticity, the shaping and multi-wire submerged-arc welding technique of the medium caliber heavy wall straight-line joint submerged arc welding tube of little radius-thickness ratio (D/t) of the X70 grade of steel that corrosion resistance nature, anti-fatigue performance, low temperature fracture toughness, strain aging performance and high dimensional accuracy require.
Background technology:
Along with the continuous exploitation of hydrocarbon resources, easily exploitation hydrocarbon resources is close to exhausted, oil-gas exploration, exploitation just day by day to desert, the more severe region of plateau, the environment such as deep-sea marches.Ocean takes up an area 70.8% of the ball total area, and explored oil and gas reserves enriches.International petroleum circle starts to carry out deep water Petroleum finance in recent years, and world oil exploration emphasis turns to ocean by land, turns to deep-sea by shallow sea.Therefore, offshore petroleum resources exploitation has great importance.
Sea-bottom oil-gas pipeline is the pipeline being carried a large amount of oil gas by airtight pipeline in seabed continuously, is the chief component of offshore oil and gas field Development and Production system, be also at present the most fast, the offshore oil and gas mode of transport of most safety and economic and reliable.Along with energy development moves towards even deep-sea, ocean gradually from land, the importance of subsea pipeline highlights day by day.Severe ocean environment proposes the specification of quality higher than terrestrial pipeline to subsea pipeline, and the transverse strength requiring steel pipe high, longitudinal strength, high low temperature arrest toughness, good weldability, Chinese People's Anti-Japanese Military and Political College's strain property, part oil gas medium also require anti-H 2s corrosive power.The exploitation in deep water hydrocarbon field proposes stricter requirement to oil and gas pipes, and deep water ocean tubing development technique is that pendulum is in our important topic urgently to be resolved hurrily in front.Energy demand promotes the exploitation of offshore oil and gas resource, and the importance of subsea pipeline highlights day by day, and the exploitation in deep water hydrocarbon field proposes higher stricter requirement to oil and gas pipes, as high pressure conquassation, high-ductility, high fatigue, sea-water corrosion etc.It is a kind of oil drill equipment with excessive risk, highly difficult, hi-tech, high added value that marine oil and gas transports with steel pipe.
Current world sea-bottom oil-gas pipeline total amount is more than 100,000 kms, and the maximum operation depth of water has reached 3000 meters.By Eleventh Five-Year Plan end, China builds submerged pipeline still less than 4000 kms, the maximum operation depth of water only 300 meters.For many years, the steel pipe of China's deep-water subsea pipe applications relies on external import always.In recent years along with marine oil gas field development puts more effort, steel pipe consumption increases, and this dependence external import mode Problems existing highlights.Longitudinal submerged arc welded pipe adopts the technique that first pre-postwelding is astute and able, and welding process is stablized, and welding quality is excellent.Steel pipe is through overall machinery expanding process, and steel duct stress is little and be evenly distributed, and effectively can prevent stress corrosion crack, dimensional precision is high, is convenient to site welding construction.Therefore, Ocean Oil And Gas Pipeline steel pipe adopts vertical masonry joint submerged arc welding steel pipe mostly.
Need for domestic and international offshore and gas development, in Submarine pipeline steel and steel pipe research and development, domestic existing many steel enterprise and pipe enterprise have possessed research and development and throughput, and have carried out the research and development of Ocean Oil And Gas Pipeline think gauge X65, X70 subsea pipeline steel and steel pipe.Chinese patent 201110258382.4 is referred to the manufacture method that a kind of JCO of employing shaping interior weldering four outside welds four techniques carry out X65 subsea pipeline steel longitudinal welded pipe.200910153710.7 be referred to a kind of manufacture method adopting HFI welding mode to carry out submerged pipeline steel pipe.Steel pipe tube-making process does not relate to the manufacture method of carrying out X70 grade of steel medium caliber heavy wall submerged pipeline steel pipe under adopting same plate material component and same weld and moulding process.
Patent of the present invention relates to subsea pipeline X70 grade of steel thick hot-rolled steel sheet Composition and structure, the JCO of subsea pipeline X70 grade of steel medium caliber thick walled steel tube shaping and multi-wire submerged-arc welding Technology, steel pipe vertical transverse strength, toughness, body and welding seam breaking toughness and corrosion resistance nature excellent combination property.
Summary of the invention:
The object of the invention is to the shortcoming overcoming above-mentioned prior art, a kind of high strength medium caliber heavy wall Submarine linepipe and manufacture method thereof are provided.Submarine linepipe of the present invention belongs to one of oceanology field gas and oil in sea exploitation critical equipment, relates to X70 grade of steel straight-line joint submerged arc welding tube and the manufacture method thereof of a kind of submerged pipeline medium caliber, greatly wall thickness, high strength, high tenacity, high uniform elongation.One is the object of the present invention is to provide to have high strength, the X70 grade of steel straight-line joint submerged arc welding tube of the medium caliber of the excellent combination properties such as good plasticity, low-temperature flexibility, break resistance, erosion resistance and fatigue property, heavy wall, high dimensional accuracy.By low-carbon microalloyed Composition Design, adopting JCO forming technique, multi-wire submerged-arc welding technique and machinery expanding technology to manufacture diameter is Ф 765.2mm, the X70 grade of steel longitudinal submerged arc welded pipe of wall thickness 31.8mm.Steel pipe body yield strength is 485 ~ 605MPa, and body tensile strength is 570 ~ 760MPa, body transverse direction and longitudinal yield tensile ratio≤0.92, welding joint tensile strength >=570MPa; Steel pipe body Charpy-V impact power >=111J at-20 DEG C, axis of a weld, welded bonds (FL), distance welded bonds 2mm and distance welded bonds 5mm place Charpy-V impact power >=50J; At horizontal average shear area >=85% that drops hammer of 0 DEG C of lower tube body, monodrome shear area >=75%; At the crack tip opening displacement CTOD eigenwert δ m >=0.22mm at 0 DEG C of lower tube body and welding joint place; Body and welding joint highest hardness value≤260HV10; Eccentricity≤6.0%, ovality≤0.5%, linearity≤0.15%.
For solving the problems of the technologies described above, the technical solution adopted in the present invention adopts following concrete technology step:
1, adopt the X70 hot-rolled steel sheet of TMCP manufacture technics, its chemical composition (mass percent) is: C0.04% ~ 0.08%, Si0.20% ~ 0.35%, Mn1.40% ~ 1.65%, P≤0.015%, S≤0.003%, Ni≤0.30%, Cr≤0.10% ~ 0.30%, Cu≤0.25%, Mo≤0.35%, Nb0.02% ~ 0.060%, V≤0.06%, Ti0.008% ~ 0.030%, Al0.015% ~ 0.050%, N≤0.01%, B≤0.0005%, Al/N >=3, Nb+V+Ti≤0.12%, surplus is iron and inevitable impurity, its carbon equivalent Ceq≤0.43, cold crack FACTOR P cm≤0.22.The alloying element couplings such as appropriate Ni, Cr, Cu, Mo are adopted in steel plate manufacturing processed, pass through cooling controlling and rolling controlling process, steel plate is obtained based on the tissue morphology of evenly tiny acicular ferrite on total wall thickness, there is higher transverse and longitudinal tensile strength and excellent low-temperature flexibility.
2, breath arc plate is drawn in welding: draw breath arc plate in four straight flange place welding in Plate Welding direction, arc crater when end of welding bead during striking and breath arc is guided to outside weldment, strengthen the constraint (restraint) degree of longitudinal joint distal portion, bear the larger tensile stress that distal portion produces, improve the Distribution of Magnetic Field of distal portion, reduce the degree of magnetic blow.
3, milling limit: finished edge.Be the steel plate of 31.8mm to thickness, upper and lower groove angle is 35 ° ± 1 °, and the width of root face is 10 ± 0.5mm, and lower groove depth is 12 ± 0.5mm, and after milling, steel plate width is 2268 ~ 2289mm.The object of finished edge ensures the complete penetration of welding process energy, avoids inside in welding process to occur incomplete penetration defect.
4, pre-flanging: utilize prebending machine to carry out edges of boards pre-bending, crimp step-length is 1800mm, and pressing force is 13.96 × 10 3kN, according to steel pipe caliber dimensional requirement, selects suitable mould, makes edges of boards have satisfactory curvature.
5, JCO is shaping: first the half of the steel plate after pre-bending repeatedly suppressed on JCO forming machine, is pressed into " J " shape, then by bending equally for second half of steel plate, is pressed into " C " shape, finally forms " O " shape of opening.Pressing process, namely suppresses passage and every time draught is determined according to the dimensions of steel pipe.When being the steel plate of 31.8mm to thickness, compacting number of times adopts 17 times, and step-length is 115mm, and each draught is 2.0mm ~ 3.0mm.Because the intensity of steel plate is high, wall thickness is large, elasticity is large, namely rebounds upon deformation is serious, and every time draught should adopt excessive pressure, after ensureing resilience, reach standard shape, and adopts the pressing process of more number of times as far as possible.
6, joint close and prewelding: by the position of adjustment joint close Prewelding machine pressure roller; make shaping after the bevel for welding of steel pipe match; guarantee misalignment, gap size meet the requirements, and adopt high-power mixed gas arc welding to weld, and form continuous, specification, stay-in-grade pre-welding line.
7, interior weldering: adopt four union melt weldings bevel for welding inside steel pipe to weld, first of four union melt weldings is DC reverse connection, the second to four for exchanging.
In sea-bottom oil-gas pipeline straight-line joint submerged arc welding tube four submerged arcs of X70 Ф 765.2 × 31.8mm, Welding parameter is: first electric current I=1000 ~ 1100A, voltage 32 ~ 36V, second electric current I=900 ~ 1000A, voltage 35 ~ 39V, 3rd electric current I=800 ~ 900A, voltage 38 ~ 42V, the 4th electric current I=700 ~ 800A, voltage 40 ~ 44V; Distance between weldingwires d=17 ~ 22mm; Welding speed V=130 ~ 150cm/min.
8, outside weld: adopt five union-melt welds bevel for welding outside steel pipe to weld, first that adopts five union melt weldings is DC reverse connection, and the second to five for exchanging.
The sea-bottom oil-gas pipeline straight-line joint submerged arc welding tube outside weld processing parameter of X70 Ф 765.2 × 31.8mm is: first electric current I=1250 ~ 1350A, voltage 31 ~ 35V, second electric current I=1000 ~ 1100A, voltage 32 ~ 36V, 3rd electric current I=900 ~ 1000A, voltage 35 ~ 39V, 4th electric current I=750 ~ 850A, voltage U=38 ~ 42V, the 5th electric current I=650 ~ 750A, voltage U=40 ~ 44V; Distance between weldingwires d=16 ~ 22mm; Welding speed V=140 ~ 160cm/min.
In said welding method, the mass percent of weld seam chemical composition is C0.04% ~ 0.08%, Si0.20% ~ 0.30%, Mn1.60% ~ 1.70%, P≤0.012%, S≤0.003%, Ni≤0.30%, Cr≤0.20%, Cu≤0.20%, Mo≤0.30%, Nb0.02% ~ 0.06%, V0.015% ~ 0.030%, Ti0.015% ~ 0.030%, Al0.020% ~ 0.040%, N≤0.008%, Al/N >=5, Nb+V+Ti≤0.12%, carbon equivalent Ceq is 0.41 ~ 0.42, cold crack FACTOR P cm is 0.16 ~ 0.20.The microstructure of weld seam is acicular ferrite is main tissue.
9, ultrasound examination I: the steel pipe inner and outer welding after welding and heat affected zone, weld seam both sides part are carried out to the inspection of 100%.
10, X-ray examination I: adopt image processing system to carry out the X-ray industrial television inspection of 100% to the steel pipe inner and outer welding after welding, ensure the sensitivity of flaw detection.
11, machinery expanding: steel pipe total length is carried out 0.6% ~ 1.2% expanding with the dimensional precision improving steel pipe, and improve the distribution of steel pipe internal stress.
12, the water test: the steel pipe after expanding is carried out to the hydrostatic test of 100% by root, test pressure is 95% ~ 100% of regulation SMYS, checks the strength level of steel pipe and whether there is leak point.
13, chamfered edge: carry out pipe end slope-mouth process to the steel pipe be up to the standards, reaches required pipe end slope-mouth size.
14, ultrasonic testing II: the steel pipe inner and outer welding after expanding, hydraulic pressure and heat affected zone, weld seam both sides part are carried out to the inspection of 100%, to get rid of expanding, the issuable defect of hydraulic pressure.
15, X-ray examination II: the steel pipe inner and outer welding after expanding and the water test is carried out to industrial television inspection and the pipe end film making of 100%, to get rid of expanding, the issuable defect of hydraulic pressure.
16, pipe end magneticpowder testing: carry out pipe end magneticpowder testing to find pipe end defect.
17, visual appearance inspection: measure steel pipe apparent size and visual appearance and check, steel pipe qualified on inspection needs to carry out anticorrosion and coating according to user, hands over user to assemble.
Owing to have employed technique scheme, the technical progress that the present invention obtains is:
(1) the present invention is by X70 grade of steel the sea-bottom oil-gas pipeline design of alloy of 31.8mm heavy wall straight-line joint submerged arc welding tube hot-rolled steel sheet and microstructures Control, steel plate is made to have high strength, high tenacity, high uniform elongation, low yield strength ratio and narrower intensity interval, and there is good corrosion resistance nature, ensure that the requirement to steel pipe longitudinal strength, transverse strength, low-temperature impact toughness, drop weight tearing performance after tubulation.
(2) the invention solves X70 grade of steel, caliber be Ф 765.2mm, problem that molding control in high-intensity high-tenacity JCOE straight-line joint submerged arc welding tube manufacture that wall thickness is 31.8mm, Weld Performance, geometric accuracy are difficult to meet technical requirements.The present invention adopts JCO shaping, and selects rational welding material and technique, particularly control shaping, welding and expanding technology parameter, make steel tube performance meet the performance requriements of deep water hydrocarbon pipeline X70 grade of steel thick walled steel tube.
(3) gordian technique of the present invention be that JCO is shaping, welding and the optimization of expanding technology, the processing parameter that the present invention is above-mentioned and processing step are through that test of many times obtains.Its gordian technique is mainly manifested in:
In molding control, because armor plate strength is high, thickness is large, and elasticity is large, the serious problems that the nonaffine deformation of JCO moulding process light plate causes localized work hardening, toughness and uniform elongation to decline.The present invention is, thickness, intensity and die size wide according to steel plate, Accurate Analysis, rationally determines compacting number of times and single pass draught, makes steel pipe each several part in JCO moulding process be out of shape even, stable performance.Adopt the pressing process of excessive pressure and more number of times, to reach the dimensional requirement of steel pipe after ensureing steel plate resilience, after making steel pipe forming, there is good circularity.
In weldprocedure, first guarantee that weld seam has the intensity of a little higher than mother metal and good toughness by preferred weld material.For controlling performance and the welding quality of weld seam, the present invention adopts the tandem welding process of a kind of interior weldering four, outside weld five.When determining welding setting, fully take into account the effect of inside and outside each road welding wire, by each silk electric current of reasonable set, voltage, angle, distance between weldingwires and welding speed.Its object: one is the heat input that can reduce unit length, reduces heat affected zone, makes the performance around Hi-grade steel pipeline weldmetal reach optimum; It two is taken into account inner quality and visual appearance; It three is taken into account high efficiency production and excellent quality.On this basis, in order to reduce the impact of thermal weld stress amount on welded heat affecting zone obdurability, each silk electric current, voltage and distance between weldingwires are optimized further, adopt lower heat input, the distance between weldingwires of adjustment tandem union-melt weld is 19 ~ 22mm, thus avoid heat to concentrate, reduce the impact of heat affected zone around welding heat butt welded seam, ensure the performance of welded heat affecting zone.Weld seam finally obtains tissue based on acicular ferrite, that have good obdurability, solves the problem that welded tube local heating in welding process causes obdurability to reduce.
In expanding technology, according to the size after steel pipe forming, shape situation, determine best expanding technology, guarantee size, shape and physicochemical property after pipe expanding, solve steel pipe when machinery expanding due to work hardening causes that intensity increases, toughness and uniform elongation reduce problem.
By the technical controlling that each operation is strict, the properties of final steel pipe is made to meet the indices requirement of deep-water subsea oil and gas pipes X70 grade of steel heavy wall straight-line joint submerged arc welding tube completely.
Accompanying drawing illustrates:
Fig. 1 is welding joint hardness determination position view;
Fig. 2 is the displaing micro tissue topography (B of body mother metal grain+ PF+P);
Fig. 3 is steel pipe seam displaing micro tissue topography (F pin+ B grain+ PF+P);
Fig. 4 is Pipe Hydrostatic Test graphic representation (average water pressure value: 40.4MPa, continues the dwell time: 20 seconds for maximum hydraulic pressure value: 40.64MPa, minimum hydraulic pressure value: 40.28MPa);
Wherein: F pinfor acicular ferrite; PF is polygonization ferrite; B grainfor granular bainite; P is perlite; A is mother metal; B is heat affected zone; C is weld seam.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in further detail:
See Fig. 1, Fig. 2, Fig. 3 and Fig. 4, embodiments of the invention are as follows:
1. employing thickness is the controlled rolling steel plate of the TMCP X70 of 31.8mm, and its chemical composition (mass percent) is: C0.06%, Si0.24%, Mn1.54%, P0.007%, S0.001%, Ni0.19%, Cr0.17%, Cu0.16%, Mo0.20%, Nb0.05%, V0.006%, Ti0.013%, Al0.03%, B0.0002%, N0.0051%, Al/N=6.5, Nb+V+Ti=0.069%, carbon equivalent Ceq are 0.41, and cold crack FACTOR P cm is 0.18.X70 controlled rolling steel plate microstructure is based on evenly tiny acicular ferrite, has higher transverse and longitudinal tensile strength and excellent low-temperature flexibility.
2, breath arc plate is drawn in welding: respectively weld one piece in four right angle in steel plate rolling direction and draw breath arc plate, guiding to outside weldment, improving the Distribution of Magnetic Field of distal portion, reducing the degree of magnetic blow when welding by arc crater when end of welding bead during striking and breath arc.
3. milling limit: finished edge.Be the steel plate of 31.8mm to thickness, upper and lower groove angle is 35 °, and the width of root face is 10.0mm, and lower groove depth is 12mm, and after milling, width is 2283mm.
4. pre-flanging: utilize prebending machine to carry out edges of boards pre-bending, according to caliber size requirement, makes edges of boards have satisfactory curvature.
5.JCO is shaping: first the half of the steel plate after pre-bending suppressed through 6 passage steppings on JCO forming machine, is pressed into " J " shape, then by bending equally for second half of steel plate, is pressed into " C " shape, finally forms " O " shape of opening at the middle pressing one-time of steel plate.Whole pressing process, adopts 17 passage compression mouldings, and step-length is 115mm, and draught per pass is 2.0mm.According to actual steel pipe forming situation, suitably can adjust in actual production.
6, joint close and prewelding: by the position of adjustment joint close Prewelding machine pressure roller; make shaping after the bevel for welding of steel pipe match; guarantee misalignment, gap size meet the requirements, and adopt high-power mixed gas arc welding to weld, and form continuous, specification, stay-in-grade pre-welding line.
7. weldering in: adopt four union melt weldings bevel for welding inside steel pipe to weld, first adopts DC reverse connection, and the second to four for exchanging.Interior weldering welding condition is: first electric current 1050A, voltage 34V, second electric current 950A, voltage 37V, the 3rd electric current 850A, voltage 40V, the 4th electric current 750A, voltage 42V, and distance between weldingwires is 20mm, and welding speed is 140cm/min.
8. outside weld: adopt five union melt weldings bevel for welding outside steel pipe to weld, first adopts DC reverse connection, and the second to five for exchanging.Outside weld welding condition is: first electric current 1300A, voltage 33V, second electric current 1050A, voltage 34V, the 3rd electric current 950A, voltage 37V, 4th electric current 800A, voltage 40V, 5th electric current 700A, voltage 42V, distance between weldingwires is 20mm, and welding speed is 150cm/min.
In said welding method, the mass percent of weld seam chemical composition is C0.06%, Si0.24%, Mn1.69%, P0.008%, S0.001%, Ni0.21%, Cr0.18%, Cu0.16%, Mo0.15%, Nb0.05%, V0.028%, Ti0.018%, Al0.035%, N0.0046%, Al/N=7.6, Nb+V+Ti=0.096%, carbon equivalent Ceq are 0.42, cold crack FACTOR P cm is 0.18.The microstructure of weld seam is acicular ferrite is main tissue.
9, ultrasound examination I: the steel pipe inner and outer welding after welding and heat affected zone, weld seam both sides part are carried out to the inspection of 100%.
10, X-ray examination I: the steel pipe inner and outer welding after welding is carried out to the industrial television inspection of 100%.
11, machinery expanding: steel pipe total length is carried out 1.0% expanding with the dimensional precision improving steel pipe, and improve the distribution of steel pipe internal stress.
12, the water test: steel pipe is carried out to the hydrostatic test of 100%, test pressure is 40.4Mpa, and the dwell time is greater than 20s.
13, chamfered edge: carry out tube end maching, is processed into satisfactory pipe end slope-mouth.
14, ultrasonic testing II: the steel pipe inner and outer welding after expanding, hydraulic pressure and heat affected zone, weld seam both sides part are carried out to the inspection of 100%, to get rid of expanding, the issuable defect of hydraulic pressure.
15, X-ray examination II: the steel pipe inner and outer welding after expanding and the water test is carried out to industrial television inspection and the pipe end film making of 100%, to get rid of expanding, the issuable defect of hydraulic pressure.
16, pipe end magneticpowder testing: magneticpowder testing is carried out to pipe end.
17, visual appearance inspection: measure steel pipe apparent size and visual appearance and check, steel pipe qualified on inspection needs to carry out anticorrosion, coating according to user, hands over user to assemble.
Physicochemical property and the outward appearance geometrical dimension detected result of what table 1, table 2, table 3, table 4, table 5 and table 6 provided the is steel pipe material object of this example, can find out by table, utilize that the X70 grade of steel of manufacturing technology manufacture of the present invention, caliber are Ф 765.2mm, wall thickness to be correlated with mechanical property and outward appearance geometric accuracy index request to steel pipe body and welding joint for 31.8mm sea-bottom oil-gas pipeline straight-line joint submerged arc welding tube reaches.
Table 1 steel pipe Erichsen test result
Table 2 steel pipe Charpy impact test result
Table 3 steel pipe DWTT test-results
Table 4 crack tip opening displacement (CTOD) test-results
Table 5 welding joint hardness Vickers hardnes test result (HV10)
Detect position 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Hardness (HV10) 225 219 221 241 250 225 226 228 235 224 246 243 230 230
Remarks: detect position see Fig. 1, namely numeral wherein detects position.
Table 6 apparent size detected result
Ovality/ Linearity/% Wall thickness uniformity/%
0.27%~0.48% 0.03%~0.06% 3.0%~5.42%
The present invention adopts carbon equivalent Ceq≤0.43, and the X70 controlled rolling steel plate of cold crack FACTOR P cm≤0.22 manufactures Submarine linepipe; The alloying element couplings such as appropriate Ni, Cr, Cu, Mo are adopted in steel plate manufacturing processed, pass through cooling controlling and rolling controlling process, steel plate is obtained based on the tissue morphology of evenly tiny acicular ferrite on total wall thickness, there is higher transverse and longitudinal tensile strength and excellent low-temperature flexibility.The process for making of steel pipe comprises that welding draws that breath arc plate, milling limit, pre-flanging, JCO are shaping, joint close and prewelding, interior weldering, outside weld, first time ultrasound investigation, first time X-ray examination, machinery expanding, the water test, chamfered edge, retaining wall on slope, second time ultrasound investigation, second time X-ray examination, pipe end magnetic particle inspection, aligning and visual appearance inspection.The tandem union melt welding of weldering four outside welds five in steel pipe adopts, and by selecting suitable welding wire, solder flux, controlling shaping and welding condition, solving the problem that steel pipe local heating in welding process causes obdurability and unit elongation seriously to reduce.Shaping and the expanding technology parameter by rational JCO, the unrelieved stress caused when eliminating shaping and welding, improve the distribution of steel pipe internal stress, in tubulation process, each several part distortion evenly, performance is even to make steel pipe, solves steel pipe in tubulation process due to work hardening causes that intensity increases, toughness and uniform elongation reduce problem; Improve the pipe deformation caused by welding effect, make steel pipe geometrical dimension, as caliber ovality, Wall thickness uniformity, linearity etc. reach required precision, so that site operation.
Above content is in conjunction with concrete preferred implementation further description made for the present invention; can not assert that the specific embodiment of the present invention is only limitted to this; for general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; some simple deduction or replace can also be made, all should be considered as belonging to the present invention by submitted to claims determination scope of patent protection.

Claims (5)

1. a manufacture method for high strength medium caliber heavy wall Submarine linepipe, is characterized in that: comprise that welding draws that breath arc plate, milling limit, pre-flanging, JCO are shaping, joint close and prewelding, interior weldering, outside weld, first time ultrasound investigation, first time X-ray examination, machinery expanding, the water test, chamfered edge, retaining wall on slope, second time ultrasound investigation, second time X-ray examination, pipe end magnetic particle inspection, aligning and visual appearance inspection, according to mass percent, the Chemical Composition of Submarine linepipe is C 0.04% ~ 0.08%, Si 0.20% ~ 0.35%, Mn 1.40% ~ 1.65%, P≤0.015%, S≤0.003%, Ni≤0.30%, Cr≤0.10% ~ 0.30%, Cu≤0.25%, Mo≤0.35%, Nb 0.02% ~ 0.060%, V≤0.06%, Ti 0.008% ~ 0.030%, Al 0.015% ~ 0.050%, N≤0.01%, B≤0.0005%, Al/N >=3, Nb+V+Ti≤0.12%, surplus is iron and inevitable impurity, its carbon equivalent Ceq≤0.43, cold crack FACTOR P cm≤0.22, in described interior weldering and outside weld, the mass percent of weld seam chemical composition is C 0.04% ~ 0.08%, Si 0.20% ~ 0.30%, Mn 1.60% ~ 1.70%, P≤0.012%, S≤0.003%, Ni≤0.30%, Cr≤0.20%, Cu≤0.20%, Mo≤0.30%, Nb 0.02% ~ 0.06%, V 0.015% ~ 0.030%, Ti 0.015% ~ 0.030%, Al 0.020% ~ 0.040%, N≤0.008%, Al/N >=5, Nb+V+Ti≤0.12%, carbon equivalent Ceq is 0.41 ~ 0.42, cold crack FACTOR P cm is 0.16 ~ 0.20, the microstructure of weld seam is acicular ferrite.
2. the manufacture method of high strength medium caliber heavy wall Submarine linepipe as claimed in claim 1, it is characterized in that: described Submarine linepipe utilizes the X70 grade of steel straight-line joint submerged arc welding tube that JCO molding mode manufacture caliber is Φ 765.2mm, wall thickness is 31.8mm, first JCO forming machine is utilized by the half of the steel plate after pre-bending through repeatedly walking compacting, be pressed into " J " shape, second half of steel plate is carried out the compacting of identical stepping number of times again, be pressed into " C " shape, finally make it form " O " shape of opening at the middle pressing one-time of whole steel plate; In above-mentioned pressing process, the compacting number of times of employing is 17 times, and step-length is 115mm, and each draught is at 2.0mm ~ 3.0mm.
3. the manufacture method of high strength medium caliber heavy wall Submarine linepipe as claimed in claim 1, is characterized in that: described machinery expanding be steel pipe total length is carried out 0.6% ~ 1.2% expanding.
4. the manufacture method of high strength medium caliber heavy wall Submarine linepipe as claimed in claim 1, is characterized in that: described interior weldering employing four union melt weldings bevel for welding inside steel pipe welds, and first adopts DC reverse connection, and the second to four for exchanging; Interior Welding parameter is: first electric current I=1000 ~ 1100A, voltage 32 ~ 36V, second electric current I=900 ~ 1000A, voltage 35 ~ 39V, 3rd electric current I=800 ~ 900A, voltage 38 ~ 42V, the 4th electric current I=700 ~ 800A, voltage 40 ~ 44V; Distance between weldingwires d=17 ~ 22mm; Welding speed V=130 ~ 150cm/min.
5. the manufacture method of high strength medium caliber heavy wall Submarine linepipe as claimed in claim 1, is characterized in that: described outside weld adopts five union-melt welds bevel for welding outside steel pipe to weld, and first adopts DC reverse connection, and the second to five for exchanging; Interior Welding parameter is: first electric current I=1250 ~ 1350A, voltage 31 ~ 35V, second electric current I=1000 ~ 1100A, voltage 32 ~ 36V, 3rd electric current I=900 ~ 1000A, voltage 35 ~ 39V, 4th electric current I=750 ~ 850A, voltage U=38 ~ 42V, the 5th electric current I=650 ~ 750A, voltage U=40 ~ 44V; Distance between weldingwires d=16 ~ 22mm; Welding speed V=140 ~ 160cm/min.
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CN104451440A (en) * 2014-09-01 2015-03-25 宝鸡石油钢管有限责任公司 High-plasticity longitudinal submerged arc welding tube for X70 thick-wall deep-sea pipeline and manufacturing method of high-plasticity longitudinal submerged arc welding tube
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