CN109794733A - A kind of oil-gas transportation X90 grade of steel φ 1524mm super large caliber heavy wall SAW spiral welded pipe and its manufacturing method - Google Patents
A kind of oil-gas transportation X90 grade of steel φ 1524mm super large caliber heavy wall SAW spiral welded pipe and its manufacturing method Download PDFInfo
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Abstract
The present invention relates to a kind of oil-gas transportation above heavy wall spiral welded pipes of X90 φ 1524mm super large caliber 20mm and its manufacturing method, the steel pipe base material is made of according to mass percent following composition: C 0.05~0.10, Si 0.20~0.26, Mn 1.7~2.0, Ni 0.15~0.30, Cr 0.20~0.30, Cu 0.10~0.25, Mo 0.20~0.30, Nb 0.05~0.12, Ti 0.010~0.025, P≤0.008, S≤0.003, surplus Fe.This method process includes: unreel, leveling, strip docking, milling side, pre-bending, molding, astute and able, pipe end is expanding, weld seam X-ray examination, the water pressure test, weld joint ultrasonic inspection, pipe end chamfered edge, finished product inspection.The docking process of strip described in this preparation method is to dock submerged-arc welding process with the plate plate that material is continuously fed；The groove is " X " type groove；The astute and able process includes interior weldering and outside weld process, using multifibres tandem submerged-arc welding process.The present invention can effectively solve the unstable problem of capability and performance in heavy wall super large caliber helix tube continuous production, improve production efficiency and reach 1.5m/min or more.
Description
Technical field
The present invention relates to one kind to be suitable for the above heavy wall spiral shell of oil-gas transportation X90 grade of steel φ 1524mm super large caliber 20mm
Rotation submerged arc welding steel pipe and its manufacturing method, the method provided by the present invention can be solved effectively in X90 grade of steel φ 1524mm super large caliber
Forming stability difference and property of welded joint are difficult to meet technical requirements in 20mm or more heavy wall spiral welded pipe continuous production process
Etc. technical problems, and guarantee that the production efficiency reaches 1.5m/min or more.
Background technique
It has been mark with the construction of Long-distance Transmission Pipeline, conveyance conduit technology has rapid since 21st century
Development.With increasing substantially for natural gas demand, in order to save the Installed capital cost of pipeline engineering, more economical and
On the basis of reasonable pipeline, improving pipeline year displacement will be so that design displacement be greatly improved.Currently, with the western gas east in China
Defeated two wires, three building up for line engineering are put into operation, and are quickly increased to meet volume increase natural gas transportation and downstream user both at home and abroad to the energy
Long to require, China's pipeline year gas transmission ability is up to or more than 30,000,000,000 m 3/a so that China's natural gas increment obtained it is huge
Big promotion.But natural gas specific gravity in China's non-renewable energy is still also very low, less than 5%, compares world level low about 20
Percentage point, only 14% people has used natural gas in national 1,300,000,000 populations, and natural gas popularity rate is also far from enough.In future
In 10 to 20 years, the demand of natural gas will keep growth, and accounting for the specific gravity of non-renewable energy total quantity consumed will be from current
Nearly 4% increases to 10%, and when by 2020, Natural Gas Consumption Using is up to 3000 billion cubic meters.
Accordingly, the pipeline year gas transmission capability improving by subsequent planning construction is needed to 50,000,000,000 m3/a or more, in conjunction with current
Status, at this stage we can only by increase caliber, improve tubing grade of steel, higher design ratio, improve pressure routes can be with
Reach further increasing for year displacement: if continuing using X80 maturation specification steel pipe, caliber is up to OD1422mm steel pipe, such as
Discharge pressure is improved to 15MPa, steel pipe minimum wall thickness (MINI W.) is up to 26.7mm (a kind of area), and thickest is up to 38.4mm
(three classes area), beyond domestic manufacture welded steel pipe manufacturing capacity, the manufacture difficulty of welded tube and necessary is very big；If further increasing grade of steel
To X90, while it can play and improve pipeline pressure, also can achieve raising conveying benefit, and can solve to a certain extent
It has determined the manufacture problem of thick-walled pipe, the existing batch micro operations experience of each pipe factory of the grade of steel and iron and steel enterprise, has certain at present
Feasibility.If further increasing caliber on this basis not only can be improved pipeline distribution pressure to OD1524mm, but also can mention
High pipeline run, a kind of area thickness of steel pipe in 20mm or so, can spiral steel pipe batch production, steel pipes with straight rolls because of steel mill
Ability, which limits, cannot achieve production, not have engineer application condition, and spiral welded pipe production application aspect have it is larger
Advantage；
With the increase of grade of steel and wall thickness, for milled in X90 grade of steel heavy wall spiral submerged welded pipe manufacturing process side, molding,
The main production process such as welding brings bigger difficulty, so that tube quality and mechanical performance are influenced, especially to the weldering of steel pipe
Seam quality is difficult to ensure, for example, edge milling machines milling band steel edge and groove are laborious with the increase of steel wall thickness, is easy
Cutter is worn, especially groove setting is unreasonable when spiral submerged welded pipe welds, and seriously causes submerged arc weld mass defect
Increase, reduces steel pipe seam quality therefrom；In addition, with the increase of steel wall thickness and caliber size, the weldering of submerged arc weld
Difficulty is connect to be consequently increased, meanwhile, the influence of welding joint structure is also increased with it, if the welding to submerged arc weld
If parameter setting is inappropriate, the pattern and mechanical performance of steel pipe submerged arc weld will affect.
Summary of the invention
The present invention designs that a kind of to be suitable for super-pressure oil-gas transportation X90 grade of steel φ 1524mm super the present invention relates to one kind
The above heavy wall SAW spiral welded pipe of heavy caliber 20mm and its manufacturing method can be solved effectively super in X90 grade of steel φ 1524mm
Forming stability difference and property of welded joint are difficult to meet skill in the above heavy wall spiral welded pipe continuous production process of heavy caliber 20mm
The technical problems such as art requirement, and guarantee that the production efficiency reaches 1.3m/min or more.The specific scheme is that
The main chemical compositions weight percent of the spiral welded pipe forms: C 0.05~0.10, Si 0.20~0.26, Mn
1.5~2.0, Ni 0.15~0.30, Cr 0.20~0.30, Cu 0.10~0.25, Mo 0.20~0.30, Nb 0.05~
0.12, Ti 0.010~0.025, P≤0.008, S≤0.003, surplus Fe, CE (pcm)≤0.20, the manufacturing method are main
Process are as follows: unreel, leveling, docking, milling side, molding, prewelding, it is inside and outside it is astute and able, pipe end is expanding, X-ray continuously detect, hydrostatic pressing try
Test, ultrasonic examination, pipe end chamfered edge, pipe end film making and finished product weighing, survey length, roll bending docking increase fly weldering trolley, it can be achieved that
Continuous production；Prewelding process is increased after molding, it can be achieved that the production of 5m/min or more continuous high speed, avoids moulding process to steel
The influence of pipe welding quality.
Above-mentioned roll bending docking process specifically includes strip chamfering device, automatic centring device and welder.Its
In, the chamfering device is processed at plate thickness upper and lower position in the width direction according to preset technological parameter
Y-shaped groove, bevel angle are 100.55 °~101.45 °, and groove depth is 16.5mm~17.0mm；Root face size 3.3~
3.8mm, preset clearance 2-3mm；The automatic centring device is properly positioned strip head by optoelectronic induction and tracked instrument equipment
Tail position is the centre of location according to 755mm, the use of strip spatial position is reference, is sought by numerical simulation calculation analysis
Stand-by strip docking geometric space position is found out, is repeated and entangles using two sides edger roll and upper lower compression roller precise hydraulic adjustment device
Partially, guarantee that two strips reach accurate contraposition；The welder, using mariages tandem technology of automatic submerged arc, to buttcover plate band
It is welded, and single-side welding double-side forming is reached by the ceramic substrate of back inert gas, welding first uses direct current
Reversal connection, welding condition are as follows: electric current I=800~1000A, voltage U=31~33.5V；Second using exchange, Welder
Skill parameter are as follows: electric current I=600~800A, voltage U=33~36V are 8~10mm, welding speed V=0.5- with preceding silk spacing
0.8m/min；Protective gas uses purity for 99.9% argon gas, and gas flow is 70~89L/min.
Above-mentioned milling side process specifically includes: first rough milling " I " shape groove, then finish-milling is at X-shaped groove, upper bevel angle
30.75 °~31.25 °, upper groove depth is 5.20mm~6.50mm；Root face 8~10mm of size, the angle of lower groove are
30.75 °~31.25 °；
The technique of above-mentioned molding procedure are as follows: use three-roll formation and the adjustable assistance molding mode of external control type；According to 68 ° 53 "
Forming angle in three-roll formation device by strip be made diameter be 1524mm helical form cylinder；The parameter of each forming roller
Setting are as follows: interior forming roller angle is 69 ° 35 ", outer forming roller angle be 70 ° 11 ", and 1# roller cornerite is 20 ° 32 ", open shelves and be
153.0mm, 3# roller cornerite are 23 ° 45 ", to open shelves be 211.0mm；According to the required precision of steel pipe caliber and roll bending material object strength level
2# roller drafts is adjusted in 27~35mm.
Above-mentioned prewelding process carries out tack welding, protection to welding groove on the inside of steel pipe using mixed gas protected consumable-electrode weld
Gas use 35-45%Ar and 55-65%CO2 mixed gas, gas flow be 66~74L/min, electric current be 990~
1210A, voltage are 23V~27V, and speed of welding is 3~8m/min；
The technique of above-mentioned astute and able process includes outside weld process and interior welder's sequence, and interior weldering uses three tandem Lincoln welds
Technique；Outside weld uses mariages tandem technology of automatic submerged arc；Wherein, interior welder's sequence first uses DC reverse connection, Welder
Skill parameter are as follows: electric current I=800~1000A, voltage U=30~33V；Second using exchange, welding condition are as follows: electric current I
=500~700A, voltage U=32~35V are 15~20mm with preceding silk spacing；Third silk is using exchange, welding condition
Are as follows: electric current I=400~600A, voltage U=34~37V are 10~15mm with preceding silk spacing；Speed of welding be 1.40~
1.60m/min；Outside weld process first uses DC reverse connection, welding condition are as follows: electric current I=1000~1300A, voltage U
=30~33V；Second using exchange, welding condition are as follows: electric current I=400~600A, voltage U=32~35V, and it is preceding
Silk spacing is 15~20mm；Speed of welding is 1.40~1.60m/min.
The beneficial effect of the present invention are as follows:
1, the present invention is for strip butt-joint process application, and effective solution continuous production process tabularium docking, which is shut down, asks
Topic, by digitizing technique it is strong compensate for high-speed production tabularium joint quality, solve strip under high-speed production and dock
The bottleneck problem that do not can guarantee.
2, the problem of interfering with each other between molding and welding is effectively realized using of the invention, was produced in practical tubulation
Welding does not have to be restricted by moulding process again in journey, and shaping speed can be greatly improved, keep the geometric dimension of welded tube more accurate, welds
Pipe it is straight degree, circularity and diameter accuracy it is higher.Meanwhile welding also being made to reach high speed steady production.
3, the above heavy wall SAW spiral welded pipe of X90 grade of steel φ 1524mm super large caliber 20mm manufactured using the method
Weld Performance is excellent, and weld seam transverse direction rectangle tensile sample fracture is located at base material, and tensile strength is greater than 710MPa；Boxing seam welding connects
Head at -10 DEG C Weld pipe mill Charpy-V impact power average value in 100J or more, the Charpy-V impact power average value of weld heat-affected zone
In 200J or more.
Specific embodiment
Example: the manufacture of X90 grades of Φ 1524 × 20.3mm spiral submerged welded pipes.
1) the X90 roll bending of 1650 × 20.3mm, main alloy element content: C 0.05%, Si 0.23%, Mn are used
1.78%, S 0.002%, P 0.007%, Ni 0.20%, Cr 0.18%, Cu 0.16%, Nb 0.07%, V 0.03%,
Ti 0.012%, Mo 0.25%, Al 0.03%, N 0.005%, B 0.005%, surplus Fe, wherein CE (Pcm) be
0.19。
2) roll bending uncoiling, leveling.
3) roll bending docks, according to preset technological parameter, to the plate thickness upper and lower position of preceding material tail portion in the width direction
Place's processing Y-shaped groove, bevel angle are 50.55 °, and outer groove depth is 17.20mm；Root face size 3.18mm；Pass through two sides
Edger roll and upper lower compression roller are fixed strip with line, are the centre of location according to plate width 825mm, determine that rear flitch band is empty
Between position reference, by numerical simulation calculation analysis search out two roll bending bands docking geometric space position, utilize two sides precision liquid
Pressure edger roll and pressure roller are adjusted correction to strip or so, upper and lower position, guarantee two strips or so 0.3~0.5mm of unfitness of butt joint, on
0.1~0.2mm of lower mistake variable；Using mariages tandem technology of automatic submerged arc, reached by the ceramic substrate of back inert gas
Single-side welding double-side forming, welding first uses DC reverse connection, welding condition are as follows: electric current I=940A, voltage U=
33.5V；Second using exchange, welding condition are as follows: electric current I=720A, voltage U=34V are with preceding silk spacing
8.5mm, welding speed V=0.55m/min；Protective gas use purity for 99.9% argon gas, gas flow 76L/min.
4) side is milled, I type is first rough milled into, rear finish-milling is at X-type, first by edges of boards width 5~15mm of milling, to guarantee removal volume
Then plate carries out finish-milling X-type groove because of defect present in the operation of rolling, mill upper 60 ° of bevel angle behind side, lower bevel angle
60 °, width of root face 8.5mm.
5) form, according to 68 ° 53 " forming angle diameter be made in the strip of the pre-flanging in three-roll formation device be
The helical form cylinder of 1524mm；The parameter setting of each forming roller are as follows: interior forming roller angle is 69 ° 35 ", outer forming roller angle is
70 ° 11 ", 1# roller cornerite is 20 ° 32 ", to open shelves be 153.0mm, 3# roller cornerite is 23 ° 45 ", to open shelves be 211.0mm；According to steel
The required precision of pipe caliber and roll bending material object strength level adjustment 2# roller drafts are in 33mm.
6) prewelding, using mixed gas protected consumable-electrode weld along steel pipe inside welding groove to steel pipe pipe after molding
Carry out positioning welding, welding parameter are as follows: the mixed gas of 39%Ar and 57%CO2 that protective gas uses, gas flow are
69L/min, electric current 1150A, voltage 25V, speed of welding 5m/min.
7) astute and able: to use multifibres tandem technology of automatic submerged arc, cooperation driven roller drives steel pipe rotary along spiral angle, right
The inside welding groove of steel pipe uses three tandem technology of automatic submerged arc to carry out interior weldering welding, uses mariages string to steel pipe outside
Column technology of automatic submerged arc carries out outside weld welding.Welding parameter is respectively set are as follows: interior welder's sequence first uses DC reverse connection, weldering
Connect technological parameter are as follows: electric current I=980A, voltage U=32V；Second using exchange, welding condition are as follows: electric current I=
650A, voltage U=34V are 18mm with preceding silk spacing；Third silk is using exchange, welding condition are as follows: electric current I=530A, electricity
U=36V is pressed, is 13mm with preceding silk spacing；Speed of welding is 1.55m/min；Outside weld process first uses DC reverse connection, weldering
Connect technological parameter are as follows: electric current I=1180A, voltage U=31.5V；Second using exchange, welding condition are as follows: electric current I=
580A, voltage U=34V are 17mm with preceding silk spacing；Speed of welding is 1.55m/min.
8) pipe end is expanding, carried out within the scope of pipe end 150mm it is cold expanding, to guarantee that pipe end pipe diameter size and ovality have
Preferable accuracy, expanding amount range are the 0.3~0.6% of diameter.
9) X-ray detection of welding carries out the welded tube inner and outer welding after welding using digital imagery x-ray inspection technique
100%X ray detection.
10) hydrostatic test, Welded Pipe carry out 95% hydrostatic test, test pressure 15.5MPa, pressure oscillation model
Enclose 0~0.5MPa, voltage stabling control 15S or more.
11) weld seam and base material ultrasonic examination, to 100% inspection of welded tube welding seam and the progress of two sides base material after welding.
12) pipe end chamfered edge, progress pipe end slope-mouth process, 22 °~25 ° of bevel angle, 0.8~2.4mm of root face, interior cone angle
≤7°。
13) pipe end is made film, and is checked making film through expanding, welded pipe end after hydraulic pressure, prevent expanding, hydraulic pressure there may be
Defect.
14) finished product inspection.
Table 1 gives the main chemical compositions of the weld seam of the embodiment of the present invention, and table 2-1, table 2-2 give of the invention real
Apply the main physicochemical property testing result of a steel pipe.As can be seen that the technical controlling stringent by each process, the items of steel pipe
API Spec 5L:2012 and Q/SY GJX 147-2015 " Sino-Russian east line natural gas pipeline projects outer diameter can be complied fully with
1422mmX80 grades of spiral seam submerged-arc welding pipe technical conditions " standard requirements.
1 X90 Φ 1524 × 20.3mm steel pipe chemical component (wt, %) of table
2 X90 Φ 1524 × 20.3mm mechanical properties of pipe of table detects (intensity)
2 X90 Φ 1524 × 20.3mm mechanical properties of pipe of table detects (toughness)
It is further described made by of the invention, and it cannot be said that a specific embodiment of the invention is only limitted to this, for
For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, if can also make
Simple deduction or replace are done, the present invention is all shall be regarded as belonging to by the claims submitted and determines scope of patent protection.
Claims (6)
1. a kind of above heavy wall spiral submerged arc welded pipe manufacturing method of X90 grades of φ 1524mm super large caliber 20mm, which is characterized in that should
The chemical component weight percentage of spiral welded pipe forms: C0.05~0.10, Si 0.20~0.26, Mn 1.7~2.0, Ni
0.15~0.30, Cr 0.20~0.30, Cu 0.10~0.25, Mo 0.20~0.30, Nb 0.05~0.12, Ti 0.010~
0.025, P≤0.008, S≤0.003, surplus Fe, CE (pcm)≤0.20, the manufacturing method process are as follows: unreel, leveling, volume
Plate docking, milling side, molding, prewelding, it is inside and outside it is astute and able, pipe end is expanding, X-ray continuously detects, hydrostatic test, ultrasonic examination,
Length is surveyed in pipe end chamfered edge, pipe end film making and finished product weighing；The roll bending docking, which increases, flies weldering trolley, realizes continuous production；It is described
Prewelding process is increased after molding, is realized the production of 5m/min or more continuous high speed, is avoided moulding process to Pipe Welding Quality
Influence.
2. the method according to claim 1, wherein roll bending docking process includes strip retaining wall on slope dress
It sets, automatic centring device and welder；
The chamfering device is processed at plate thickness upper and lower position in the width direction according to preset technological parameter
Y-shaped groove, bevel angle are 100.55 °~101.45 °, and groove depth is 16.5mm~17.0mm；Root face 3~5mm of size,
Preset clearance 2-3mm；
The automatic centring device is properly positioned strip position end to end by optoelectronic induction and tracked instrument equipment, according to
755mm is the centre of location, the use of strip spatial position is reference, searches out stand-by strip by numerical simulation calculation analysis and docks
Geometric space position is repeated correction using two sides edger roll and upper lower compression roller precise hydraulic adjustment device, guarantees that two strips reach
To accurate contraposition；
The welder welds buttcover plate band using mariages tandem technology of automatic submerged arc, and passes through back inertia
The ceramic substrate of gas reaches single-side welding double-side forming, and welding first uses DC reverse connection, welding condition are as follows: electric current
I=800~1000A, voltage U=31~33.5V；Second using exchange, welding condition are as follows: and electric current I=600~
800A, voltage U=33~36V are 8~10mm, welding speed V=0.5-0.8m/min with preceding silk spacing；Protective gas uses
The argon gas that purity is 99.9%, gas flow are 70~89L/min.
3. the method according to claim 1, wherein milling side process specifically includes: first rough milling " I " shape slope
Mouthful, then for finish-milling at X-shaped groove, upper bevel angle is 30.75 °~31.25 °, and upper groove depth is 5.20mm~6.50mm；
Root face 8~10mm of size, the angle of lower groove are 30.75 °~31.25 °.
4. according to the method described in claim 1, it is characterized by: the technique of the molding procedure are as follows: using three-roll formation and
External control type is adjustable assistance molding mode；
The moulding process is according to 69 ° 23 " forming angle in three-roll formation device by the strip be made diameter be 1524mm
Helical form cylinder；The parameter setting of each forming roller are as follows: interior forming roller angle is 69 ° 35 ", outer forming roller angle is 70 ° 11 ",
It is 211.0mm that 1# roller cornerite, which is 20 ° 32, ", open shelves be 153.0mm, 3# roller cornerite is 23 ° 45 ", opens shelves；According to steel pipe caliber essence
Degree requires and roll bending material object strength level adjustment 2# roller drafts is in 27~35mm.
5. according to the method described in claim 1, it is characterized by: the prewelding process uses mixed gas protected consumable-electrode weld
Tack welding is carried out to welding groove on the inside of steel pipe, the mixed gas of 35-45%Ar and 55-65%CO2 that protective gas uses, gas
Body flow is 66~74L/min, and electric current is 990~1210A, and voltage is 23V~27V, and speed of welding is 3~8m/min.
6. according to the method described in claim 1, it is characterized by: the technique of the astute and able process includes outside weld process and interior weldering
Process, interior weldering use three tandem technology of automatic submerged arc；Outside weld uses mariages tandem technology of automatic submerged arc；
Described interior welder's sequence first uses DC reverse connection, welding condition are as follows: electric current I=800~1000A, voltage U=
30~33V；Second using exchange, welding condition are as follows: electric current I=500~700A, voltage U=32~35V, with preceding silk
Spacing is 15~20mm；Third silk is using exchange, welding condition are as follows: electric current I=400~600A, voltage U=34~37V,
It is 10~15mm with preceding silk spacing；Speed of welding is 1.40~1.60m/min；
Described outside weld process first uses DC reverse connection, welding condition are as follows: electric current I=1000~1300A, voltage U
=30~33V；Second using exchange, welding condition are as follows: electric current I=400~600A, voltage U=32~35V, and it is preceding
Silk spacing is 15~20mm；Speed of welding is 1.40~1.60m/min.
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| CN110695500A (en) * | 2019-09-25 | 2020-01-17 | 西安理工大学 | Preparation method of X80 pipeline steel welded joint with excellent low-temperature performance |
| CN110904384A (en) * | 2019-12-02 | 2020-03-24 | 中国石油集团渤海石油装备制造有限公司 | Q345NS spiral submerged arc welded pipe for resisting sulfuric acid dew point corrosion and manufacturing process thereof |
| CN111206185A (en) * | 2020-02-12 | 2020-05-29 | 首钢集团有限公司 | High-strength low-yield-ratio steel and preparation method and application thereof |
| CN112059362A (en) * | 2020-09-03 | 2020-12-11 | 武汉钢铁有限公司 | X90 pipeline steel high heat input welding method |
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