CN103556079B - The high strength marine riser supervisor that a kind of anti-fatigue performance is excellent and manufacture method thereof - Google Patents
The high strength marine riser supervisor that a kind of anti-fatigue performance is excellent and manufacture method thereof Download PDFInfo
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Abstract
The invention discloses the excellent high strength marine riser supervisor of a kind of anti-fatigue performance and manufacture method thereof, according to mass percent, the Chemical Composition of marine riser supervisor is C0.04% ~ 0.08%, Si0.15% ~ 0.35%, Mn1.55% ~ 1.85%, P≤0.015%, S≤0.003%, Ni≤0.30%, Cr≤0.30%, Cu≤0.25%, Mo≤0.25%, Nb0.02% ~ 0.060%, V≤0.06%, Ti0.008% ~ 0.06%, Al0.010% ~ 0.040%, N≤0.008%, Al/N >=3, Ni+Cu+Mo+Cr≤0.70%, Nb+V+Ti≤0.12%, its carbon equivalent Ceq≤0.45, cold crack FACTOR P cm≤0.23, microstructure is the compound fine grained texture of acicular ferrite+bainite.Of the present invention provide a kind of there is anti-fatigue performance X80 high strength, high dimensional accuracy marine riser supervisor, there is plasticity, low-temperature flexibility, the characteristic of the excellent combination property such as break resistance, erosion resistance.
Description
Technical field:
The invention belongs to oil country tubular goods field, relate to the excellent high strength marine riser supervisor of a kind of anti-fatigue performance and manufacture method thereof, especially a kind of there is good anti-fatigue performance and low-temperature flexibility high strength, corrosion-resistant, high dimensional accuracy marine drilling exploration X80 steel-grade, caliber is Φ 533.4mm, and wall thickness is marine riser straight-line joint submerged arc welding tube forming technique and the multi-wire submerged-arc welding technique of 25.4mm.
Background technology:
Drilling riser guard system is important equipment marine drilling platform carrying out drilling well.Offshore Drilling Riser is single is the main body of riser system, be one and lead to the liquid conducting pipes of subsea blow out prevention apparatus from marine drilling platform, be mainly used to isolate extraneous seawater, for circulation of drilling fluid, install under water BOP, support various control pipeline, and play the guide effect from rig floor to subsea wellhead installations of drilling rod, drilling tool, be one of important component part and critical equipment that exploitation of offshore oil and gas is produced.
Along with Marine oil and gas resource exploitation is from shallow sea to the extension at deep-sea, the ocean Service Environment that sea-water corrosion, surge, ocean current environment, ocean vortex-induced vibration and deep-water pressure etc. are severe, strict requirement is proposed to deep sea drilling equipment, especially has strict requirement to indexs such as anti-fatigue performance, intensity, toughness, bursting property of resistance to compression and dimensional precisioies that deep sea drilling marine riser is responsible for.Therefore, Offshore Drilling Riser is a kind of oil drill equipment with excessive risk, highly difficult, hi-tech, high added value, and technical requirements is high, and development difficulty is large.
The country at present with Offshore Drilling Riser development ability is few in number, and riser system design is all monopolized by foreign country with utilisation technology, only has the countries such as the U.S., Norway, France, Russia, and other country and company also do not possess development ability.Deep sea drilling marine riser technology only rests in the states such as the U.S., Norway, Japan.China's marine exploration and development is started late by the impact of the factors such as equipment, technology, and up to now, China is still in blank at Offshore Drilling Riser technical elements, whole dependence on import.
The emphasis of global ocean oil and gas development transfers to deepwater regions just gradually.Move towards the Major Strategic selection of deep water, the new millennium marine oil development of exploitation South Sea Ye Shi China.Therefore exploitation has the deep sea drilling marine riser of independent intellectual property right, not only worldwide has wide market outlook, also has its own strategic significance to China's marine oil gas field development.
Chinese patent 200820029879 relates to one and connects to form a pipe string by multiple single marine riser is upper and lower, and the ocean deepwater drilling riser system device formed after other parts of supporting connection.200820211642 relate to the full-automatic rapid-acting coupling of a kind of Offshore Drilling Riser.It comprises that the mother law being arranged on marine riser top is blue, the public law of bottom is blue, automatic stuck device and auxiliary line joint four part, public law is blue to be coordinated with the mother law orchid of last joint marine riser, mother law is blue to be coordinated with the rear one public law orchid saving marine riser, automatic stuck device is arranged on flange combination section, the edge of flange is with auxiliary line, and auxiliary line joint is arranged on auxiliary line.PCT/CN2011/075363 relate to a kind of for ocean deepwater environment use drilling riser single and single between coupling device, be specifically related to a kind of rotary locking piece type drilling riser connector.Domestic patent yet there are no the method for manufacturing technology relating to marine riser supervisor.
Summary of the invention:
The object of the invention is to the shortcoming overcoming above-mentioned prior art, there is provided a kind of there is good anti-fatigue performance and low-temperature flexibility high strength, corrosion-resistant, high dimensional accuracy marine drilling exploration X80 steel-grade, caliber is Φ 533.4mm, and wall thickness is marine riser supervisor and the manufacture method of 25.4mm.
The object of the present invention is to provide one to have anti-fatigue performance, high strength, there is the excellent combination properties such as good plasticity, low-temperature flexibility, break resistance, erosion resistance, the X80 steel-grade Deep Water Drilling Riser supervisor of 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 Φ 533.4mm, and wall thickness is the X80 steel-grade Offshore Drilling Riser longitudinal submerged arc welded pipe of 25.4mm.Steel pipe body transverse direction and longitudinal yield strength >=555MPa, tensile strength >=625MPa, body transverse direction and longitudinal yield tensile ratio≤0.90, welding joint tensile strength >=625MPa; 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 >=0.254mm 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≤0.1%.
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 X80 hot-rolled steel sheet of TMCP manufacture technics, its chemical composition (mass percent) is: C0.04% ~ 0.08%, Si0.15% ~ 0.35%, Mn1.55% ~ 1.85%, P≤0.015%, S≤0.003%, Ni≤0.30%, Cr≤0.30%, Cu≤0.25%, Mo≤0.25%, Nb0.02% ~ 0.060%, V≤0.06%, Ti0.008% ~ 0.06%, Al0.010% ~ 0.040%, N≤0.008%, Al/N >=3, Ni+Cu+Mo+Cr≤0.70%, Nb+V+Ti≤0.12%, surplus is iron and inevitable impurity, its carbon equivalent Ceq≤0.45, cold crack FACTOR P cm≤0.23.Steel plate microstructure is the compound fine grained texture of acicular ferrite+bainite.
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 25.4mm to thickness, upper and lower groove angle is 35 °, and the width of root face is 8.0mm, and lower groove depth is 10.5mm, and after milling, steel plate width is 1577 ~ 1583mm.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 3.66 × 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 25.4mm steel plate to thickness, compacting number of times adopts 13 times, and step-length is 100mm, and each draught is at 2.0mm ~ 3.0mm.Because the intensity of steel plate is high, elasticity 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 marine riser straight-line joint submerged arc welding tube four submerged arcs of X80 Φ 533.4 × 25.4mm, Welding parameter is: first electric current I=1000 ~ 1100A, voltage 31 ~ 35V, second electric current I=850 ~ 950A, voltage 33 ~ 37V, 3rd electric current I=650 ~ 750A, voltage 35 ~ 39V, the 4th electric current I=550 ~ 650A, voltage 37 ~ 41V; Distance between weldingwires d=17 ~ 22mm; Welding speed V=130 ~ 150cm/min.
8, outside weld: adopt four union-melt welds bevel for welding outside steel pipe to weld, first that adopts four union melt weldings is DC reverse connection, and the second to four for exchanging.
The marine riser straight-line joint submerged arc welding tube outside weld processing parameter of X80 Φ 533.4 × 25.4mm is: first electric current I=1150 ~ 1250A, voltage 31 ~ 35V, second electric current I=950 ~ 1050A, voltage 33 ~ 37V, 3rd electric current I=850 ~ 950A, voltage 36 ~ 40V, the 4th electric current I=750 ~ 850A, voltage U=38 ~ 42V; Distance between weldingwires d=16 ~ 22mm; Welding speed V=130 ~ 150cm/min.
In said welding method, the mass percent of weld seam chemical composition is C0.04% ~ 0.08%, Si0.15% ~ 0.35%, Mn1.65% ~ 1.85%, P≤0.015%, S≤0.005%, Ni≤0.30%, Cr≤0.30%, Cu≤0.30%, Mo≤0.30%, Nb0.02% ~ 0.06%, V0.008% ~ 0.060%, Ti0.008% ~ 0.060%, Al0.010% ~ 0.040%, N≤0.008%, Al/N >=3, Ni+Cu+Mo+Cr≤0.70%, Nb+V+Ti≤0.12%, carbon equivalent Ceq is 0.41 ~ 0.45, cold crack FACTOR P cm is 0.16 ~ 0.21.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 0.7% ~ 1.3% 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, align: carry out operation steel pipe aligning by three-point bending mode, the linearity of specification steel pipe.
18, 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 the design of alloy of X80 steel-grade Deep Water Drilling Riser straight-line joint submerged arc welding tube hot-rolled steel sheet and microstructures Control, steel plate foreign matter content and inclusion morphology are effectively controlled, there is 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 property indices requirement of steel pipe after tubulation.
(2) the invention solves X80 steel-grade, caliber be Φ 533.4mm, problem that molding control in high-intensity high-tenacity JCOE straight-line joint submerged arc welding tube manufacture that wall thickness is 25.4mm, 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 welded tube performance meet X80 steel-grade marine riser supervisor performance requriements.
(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, 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 a kind of welding process of four tandems, and inside and outside weld seam divides four layers of continuous welding respectively and once completes, and first is bottom, and second and the 3rd is packing layer, and the 4th is this surface layer.Be characterized in: 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.
When determining welding setting, take into full account the effect of each silk in four wire bonds, by each silk electric current of reasonable set, voltage, angle, distance between weldingwires and welding speed, make weld seam obtain suitable depth of penetration and good pattern, be conducive to gas and slag in welding process simultaneously and float.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 tandem four union-melt welds is adjusted to 18 ~ 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 requirements of deep-sea X80 drilling water-separation pipe straight-line joint submerged arc welding tube completely.
Accompanying drawing illustrates:
Fig. 1 is welding joint Hardness Surveillance position view;
Fig. 2 is displaing micro tissue topography's (acicular ferrite) of body base metal test specimen;
Fig. 3 is displaing micro tissue topography's (acicular ferrite) at steel pipe seam place;
Fig. 4 is Pipe Hydrostatic Test graphic representation (average water pressure value: 32.26MPa, continues the dwell time: 20 seconds for maximum hydraulic pressure value: 32.45MPa, minimum hydraulic pressure value: 32.08MPa).
Wherein: 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 X80 of 25.4mm, and its chemical composition (mass percent) is: C0.06%, Si0.21%, Mn1.78%, P0.012%, S0.002%, Ni0.13%, Cr0.13%, Cu0.12%, Mo0.10%, Nb0.04%, V0.004%, Ti0.015%, Al0.03%, B0.0003%, N0.0046%, Al/N=6.52, Ni+Cu+Mo+Cr=0.48%, Nb+V+Ti=0.059%, carbon equivalent Ceq are 0.42, and cold crack FACTOR P cm is 0.18.
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 25.4mm to thickness, upper and lower groove angle is 35 °, and the width of root face is 8.0mm, and lower groove depth is 10.5mm.
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 " 0 " shape of opening at the middle pressing one-time of steel plate.Whole pressing process, adopts 13 passage compression mouldings, and draught per pass is 3.0mm.According to actual steel pipe forming situation, suitably can adjust in actual production.
6. joint close and prewelding: steel pipe is sent into joint close Prewelding machine by track; by the position of adjustment joint close Prewelding machine pressure roller; make shaping after the good coupling of the bevel for welding of steel pipe together, and adopt shielded welding to weld, formed continuously, 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 33V, second electric current 900A, voltage 35V, the 3rd electric current 700A, voltage 37V, the 4th electric current 600A, voltage 39V, and distance between weldingwires is 20mm, and welding speed is 140cm/min.
8. outside weld: adopt four union melt weldings bevel for welding outside steel pipe to weld, first adopts DC reverse connection, and the second to four for exchanging.Outside weld welding condition is: first electric current 1200A, voltage 33V, second electric current 1000A, voltage 35V, the 3rd electric current 900A, voltage 38V, the 4th electric current 800A, voltage 40V, and distance between weldingwires is 20mm, and welding speed is 140cm/min.
In said welding method, the mass percent of weld seam chemical composition is C0.07%, Si0.28%, Mn1.81%, P0.014%, S0.004%, Ni0.089%, Cr0.090%, Cu0.097%, Mo0.26%, Nb0.02%, V0.003%, Ti0.02%, Al0.03%, N0.0063%, Al/N=4.76, Ni+Cu+Mo+Cr=0.469%, Nb+V+Ti=0.043%, Ceq0.44, Pcm0.20, 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: 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 1.2% 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 32.26Mpa, 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, align: carry out steel pipe aligning, the linearity of specification steel pipe.
18, 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 X80 steel-grade of manufacturing technology manufacture of the present invention, caliber are Φ 533.4mm, wall thickness has good fatigue resistance and high dimensional precision, the excellent combination properties such as plasticity, toughness and erosion resistance for 25.4mm marine riser supervisor.
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) | 210 | 209 | 210 | 217 | 228 | 200 | 216 | 220 | 212 | 221 | 222 | 229 | 209 | 215 |
Table 6 apparent size detected result
| Ovality | Linearity | Wall thickness uniformity |
| 0.1％～0.32％ | 0.04％～0.06％ | 4.0％～5.6％ |
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 interior external welding of steel pipe adopts four tandem union melt weldings, 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, and align operation by steel pipe, the unrelieved stress caused when eliminating shaping and welding, improve steel pipe internal stress distribution, 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.
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 (7)
1. the high strength marine riser supervisor that an anti-fatigue performance is excellent, it is characterized in that: according to mass percent, the Chemical Composition of marine riser supervisor is C 0.04% ~ 0.08%, Si 0.15% ~ 0.35%, Mn1.55% ~ 1.85%, P≤0.015%, S≤0.003%, Ni≤0.30%, Cr≤0.30%, Cu≤0.25%, Mo≤0.25%, Nb 0.02% ~ 0.060%, V≤0.06%, Ti 0.008% ~ 0.06%, Al 0.010% ~ 0.040%, N≤0.008%, Al/N >=3, Ni+Cu+Mo+Cr≤0.70%, Nb+V+Ti≤0.12%, its carbon equivalent Ceq≤0.45, cold crack FACTOR P cm≤0.23, microstructure is the compound fine grained texture of acicular ferrite+bainite, described marine riser supervisor utilizes the steel pipe that JCO molding mode manufactures X80 steel-grade, caliber is Φ 533.4mm, wall thickness is 25.4mm, the body transverse direction of described steel pipe and longitudinal yield strength >=555MPa, tensile strength >=625MPa, body transverse direction and longitudinal yield tensile ratio≤0.90, welding joint tensile strength >=625MPa, 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 >=0.254mm 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≤0.1%.
2. the manufacture method of high strength marine riser supervisor as claimed in claim 1, 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.
3. the manufacture method of high strength marine riser supervisor as claimed in claim 2, is characterized in that, described steel pipe is utilize JCO molding mode to manufacture X80 steel-grade, caliber are Φ 533.4mm, wall thickness is 25.4mm steel pipe; 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; The compacting number of times adopted is 13 times, and step-length is 100mm, and each draught is at 2.0mm ~ 3.0mm.
4. the manufacture method of high strength marine riser supervisor as claimed in claim 2, is characterized in that: described machinery expanding be steel pipe total length is carried out 0.7% ~ 1.3% expanding.
5. as claimed in claim 2 high strength marine riser supervisor manufacture method, it is characterized in that: described interior weldering employing four union melt weldings bevel for welding inside steel pipe welds, first adopt DC reverse connection, the second to four for exchange; Interior Welding parameter is: first electric current I=1000 ~ 1100A, voltage 31 ~ 35V, second electric current I=850 ~ 950A, voltage 33 ~ 37V, 3rd electric current I=650 ~ 750A, voltage 35 ~ 39V, the 4th electric current I=550 ~ 650A, voltage 37 ~ 41V; Distance between weldingwires d=17 ~ 22mm; Welding speed V=130 ~ 150cm/min.
6. as claimed in claim 2 high strength marine riser supervisor manufacture method, it is characterized in that: described outside weld operation adopts four union-melt welds bevel for welding outside steel pipe to weld, first adopt DC reverse connection, the second to four for exchange; Interior Welding parameter is: first electric current I=1150 ~ 1250A, voltage 31 ~ 35V, second electric current I=950 ~ 1050A, voltage 33 ~ 37V, 3rd electric current I=850 ~ 950A, voltage 36 ~ 40V, the 4th electric current I=750 ~ 850A, voltage U=38 ~ 42V; Distance between weldingwires d=16 ~ 22mm; Welding speed V=130 ~ 150cm/min.
7. as claimed in claim 2 high strength marine riser supervisor manufacture method, it is characterized in that: in described interior weldering and outside weld, the mass percent of weld seam chemical composition is C 0.04% ~ 0.08%, Si 0.15% ~ 0.35%, Mn 1.65% ~ 1.85%, P≤0.015%, S≤0.005%, Ni≤0.30%, Cr≤0.30%, Cu≤0.30%, Mo≤0.30%, Nb 0.02% ~ 0.06%, V 0.008% ~ 0.060%, Ti0.008% ~ 0.060%, Al 0.010% ~ 0.040%, N≤0.008%, Al/N >=3, Ni+Cu+Mo+Cr≤0.70%, Nb+V+Ti≤0.12%, carbon equivalent Ceq is 0.41 ~ 0.45, cold crack FACTOR P cm is 0.16 ~ 0.21, the microstructure of weld seam is acicular ferrite is main tissue.
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| CN103556079B true CN103556079B (en) | 2015-10-28 |
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