CN105834697A - Manufacturing method of X80 pipeline steel straight welded pipe - Google Patents
Manufacturing method of X80 pipeline steel straight welded pipe Download PDFInfo
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- CN105834697A CN105834697A CN201610344663.4A CN201610344663A CN105834697A CN 105834697 A CN105834697 A CN 105834697A CN 201610344663 A CN201610344663 A CN 201610344663A CN 105834697 A CN105834697 A CN 105834697A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
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- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention belongs to the field of manufacturing of mechanical equipment, and in particular, relates to a manufacturing method of an X80 pipeline steel straight welded pipe. The manufacturing method of the X80 pipeline steel straight welded pipe comprises the process steps of: preparation procedure, edge milling, UOE or JCOE process molding, prewelding, inner welding, outer welding, inspection procedure before diameter expansion, steel pipe diameter expansion, water pressure experiment and product inspection. The manufacturing method adopts a brand new design for a welding groove form, renewedly distributes the welding line energy of inner and outer welding beads, increases the welding line energy of the outer welding beads, and reduces the welding line energy of the inner welding beads. The reduction of the welding line energy of the inner welding beads can prominently reduce the size of grains in a critical coarse grain area of a heat affected zone to facilitate the distribution discretization of chained M-A components, and can reduce the size of the M-A components to obviously promote the toughness of the heat affected zone. In addition, although the filling quantity of the outer welding beads is increased, the welding speed can be guaranteed without reducing the production efficiency through adjusting such process parameters as welding current and voltage.
Description
Technical field
The invention belongs to plant equipment and manufacture field, in particular it relates to the manufacturer of a kind of straight-line joint submerged arc welding tube
Method, as oil and gas transmission, it is adaptable to the X80 pipe line steel ERW of Φ 1422mm × 21.4mm
Manufacture.
Background technology
Along with the enforcement of the pipe engineerings such as transfering natural gas from the west to the east, pipe line steel develops rapidly the most at home,
The manufacture level of current domestic pipe line steel has occupy prostatitis, the world.Present stage, the gas transmission line laid
Main application is X80 pipe line steel.The property indices of the X80 pipe line steel mother metal produced at present can reach
To standard-required, but its welding process still suffers from a lot of problem；Further, in oil and gas pipelines, weldering
Seam length proportion is relatively big, therefore the performance of welding point will directly determine whole piece pipeline safety and
Reliability.
The performance of welding point is mainly determined by the performance of welding heat affected zone and weld metal.At present, pipeline
During steel pipe welding, the intensity of weld metal and toughness have preferably coupling, do not become reduction welding
The principal element of joint performance.And the performance of heat affected area instability, especially impact flexibility test process
In often have low value to occur.The performance of welding heat affected zone is mainly by composition and the welding procedure decision of mother metal.
The pipe line steel major part produced now all uses the microalloying design of low-carbon (LC)/Ultra-low carbon, Gao Meng, high niobium, female
Material composition difference is the most little.The performance of welding heat affected zone to be improved, comes mainly by improving welding procedure
Realize.The welding procedure of tubulation major part at present uses two-sided automatic submerged arc welding, with spiral welded pipe and straight weld
Guan Weizhu.
Although large straight seam is due to factors such as manufacturing process are complicated, production cost is high, its price is higher than passing
The spiral seam steel pipe submerged arc of system, but relative to spiral welded pipe, large straight seam is high pressure resistant in distance
Ratio shared in oil gas pipeline construction is higher.This is owing to ERW is suitable in high pressure, high-risk
Danger, geology and natural conditions rather harsh, the energy conveyance conduit backbone in important location use in building.
Therefore large straight seam just develops towards heavy caliber, high intensity, the direction of high tenacity.Current large-scale vertical masonry joint
The manufacturing process of welded tube pipe mainly has: UOE forming process, row roller forming method (CFE), roll forming method
(RBE), rolling shaping method (HU-METAL), bending and forming method (PFE), JCOE forming process and increment shape
Method (CE) etc..In actual production, main application is two kinds of techniques of JCOE and UOE.
Steel pipes with straight is to weld respectively from inner side and outer side.From the beginning of tandem mariages SAW, develop into
3 SAW, 4 SAW, Japan nineteen ninety-five successfully develop 6 SAW techniques.To external diameter 762mm,
The pipeline of wall thickness 23.8mm, 4 SAW improve speeds of welding 1.3 times than 3 SAW, 6 ratios 4
SAW improves speed 1.7 times, and appearance of weld is good and uses slug type neutrality solder flux can ensure weld metal
Toughness.
At present, the groove type major part that ERW uses is docking X-type groove, such as Figure of description 1
Shown in.Interior welding bead 2, the groove opening angle 9 and 7 of outer welding bead 3 are mostly 30～40 °, the internal groove degree of depth
10 and outer groove depth 8 also most approximately equal, the length 11 of root face regards thickness of slab and determines.Corresponding this kind of groove
The weld heat input of the inside and outside welding bead of form is the most roughly the same, according to practical condition 30～50kJ/cm
?.As a example by the X80 pipe line steel ERW (thickness of slab 21.4mm) that certain steel tube factory produces, inside and outside
Groove opening angle 9 and 7 is all 35 ± 2 °, and outer groove depth 8 is 8 ± 1mm, and the internal groove degree of depth 10 is
6.9±1mm；Root face height 11 is 6.5 ± 1mm.Corresponding welding condition, the welding of inside and outside welding bead
Heat input is 30～35k about J/cm.The welding procedure of this kind of double pass welds is due to the hot shadow of inside and outside welding bead
Ring district to intersect, inevitably result from IRCGHAZ.IRCGHAZ tissue is by thick former Austria
Family name's body crystal grain plus along crystal boundary continuous distribution M-A constituent element form, intra-die be organized as thick upper shellfish
Family name's body or granular bainite.IRCGHAZ may result in the impact flexibility of welding heat affected zone and is remarkably decreased,
Making the overall performance requirement less than relevant criterion of welding point, in actual production, Charpy impact tests out existing
Low value major part at below 50J.Therefore, this kind of welding procedure need to improve, thus it is double to improve pipe line steel
The overall performance of vertical masonry joint Lincoln weld welding heat affected zone, face.
Summary of the invention
For the defect overcoming existing ERW manufacture method to exist, the present invention provides a kind of X80 pipe line steel straight
The manufacture method of seam welded tube, the method is applicable to the X80 pipe line steel ERW of Φ 1422mm × 21.4mm
Manufacture.
For achieving the above object, the present invention uses following proposal:
The manufacture method of X80 pipe line steel ERW, processing step is as follows:
1, preparatory process
2, milling limit
3, UOE or JCOE technological forming
4, prewelding
5, interior weldering
6, outside weld
7, expanding front inspection operation
8, pipe expanding
9, hydrostatic test
10, the examination and test of products
Relative to prior art, there is advantages that by welding groove type is carried out entirely
New design, changes traditional docking X-type groove into interior welding bead V-type, the compound groove of outer welding bead, and strengthens
The groove depth of outer welding bead, reduce in the groove depth of welding bead, thus internally, the weld heat input of outer welding bead
Redistributed, increased outer welding bead weld heat input, welding bead heat input in reducing.Interior welding bead heat input
Reduction can significantly reduce the crystallite dimension of IRCGHAZ, heat affected area, contribute to chain M-A constituent element and divide
The discretization of cloth, can also reduce the size of M-A constituent element, so that the toughness of welding heat affected zone has simultaneously
It is obviously improved.It addition, although the loading of outer welding bead increased, but by adjusting welding current, electricity
The technological parameters such as pressure, it is possible to ensure bonding speed, production efficiency can't be reduced.
Accompanying drawing explanation
Fig. 1 is the groove schematic diagram that current X80 pipe line steel ERW is conventional；Wherein, 1-prewelding, in 2-
Weldering, 3-outside weld, the outer groove of 4-, 5-internal groove, 6-root face, the outer groove opening angle of 7-, the outer groove depth of 8-,
9-internal groove opening angle, the 10-internal groove degree of depth, 11-root face height.
Fig. 2 is the groove schematic diagram of the X80 pipe line steel ERW of the present invention；Wherein, 1-prewelding, in 2-
Weldering, 3-outside weld, the outer groove top of 4-, bottom the outer groove of 5-, 6-internal groove, 7-root face, bottom the outer groove of 8-
Opening angle, the degree of depth bottom the outer groove of 9-, 10-outer groove top opening angle, the outer groove top depth of 11-,
The outer groove total depth of 12-, 13-internal groove opening angle, the 14-internal groove degree of depth, 15-root face height.
Detailed description of the invention
As in figure 2 it is shown, the manufacture method of X80 pipe line steel ERW, employing wall thickness is 21.4mm, width
For the X80 pipe line steel flat board of 4485mm, its chemical composition (percentage by weight) is as follows: C 0.04～0.07,
Si 0.15～0.25, Mn 1.68～1.78, Nb 0.04～0.05, Ti 0.01～0.02, Cu 0.12～0.22,
Cr 0.20～0.28, Mo 0.10～0.20, Ni 0.10～0.20, P < 0.015, S < 0.005, N < 0.006,
Fe is surplus；Making the X80 pipe line steel ERW that caliber is Φ 1422mm, processing step is as follows:
1, preparatory process: include X80 Pipeline Steel Plate leveling, steel plate feeding and weldering run-on tab.
2, milling limit: first rough mill, by edges of boards width mill off 5～10mm；Then finish-milling, as shown in Figure 2,
Groove outside tube wall is outer groove, and the groove of inner side is internal groove 6, and the straight flange between two grooves is root face 7；
Outer groove uses compound groove, is divided into bottom 4 and top 5, the opening angle 8 bottom outer groove be 45～
60 °, the degree of depth 9 bottom outer groove is 2～3mm；The opening angle 10 at outer groove top is 8～15 °,
The degree of depth 11 at outer groove top is 5～8mm；The total depth 12 of outer groove is 7～11mm；Internal groove 6
For double V-groove, internal groove opening angle 13 is 30～40 °, and the internal groove degree of depth 14 is 4～6mm；Blunt
Limit thickness 15 is 6～8mm.
3, UOE or JCOE technological forming: X80 Pipeline Steel Plate employing UOE or JCOE technique is added
The steel pipe that work becomes caliber to be Φ 1390 ± 5mm, the unfitness of butt joint≤2.5mm of butting grooves.
4, prewelding: groove root position is carried out outside, uses gas shielded arc welding, and welding condition is: straight
Stream reversal connection, welding current 890～990A, voltage 22～26V, weldering speed 3～4m/min, gas mixing ratio is CO2:
15～25%, Ar:75%～85%, gas flow 40～60L/min.
5, interior weldering: using three Lincoln welds of file, welding condition is: first is DC reverse connection,
Electric current 850～1050A, voltage 31～35V；Second just connects for exchanging with the 3rd；The electric current of second
500～600A, voltage 36～40V；The electric current 500～600A of the 3rd, voltage 38～42V；Speed of welding
It is 1.6～1.8m/min.
6, outside weld: using four Lincoln welds of file, welding condition is: first is DC reverse connection,
Electric current 1050～1250A, voltage 32～36V；Second to the 4th just connects for exchange；Second electric current 750～950
A, voltage 36～40V；3rd electric current 600～700A, voltage 38～42V；4th electric current 550～650
A, voltage 38～42V；Speed of welding is 1.6～1.8m/min.
7, the expanding front operation that checks: include removing run-on tab, weld seam and pipe end ultrasonic inspection and X-ray examination.
8, pipe expanding: use hydrostatic expansion or machinery expanding technique, by overall for steel pipe expanding to Φ 1422
mm。
9, hydrostatic test: carry out the steel pipe after expanding checking by root to ensure that steel pipe reaches on hydrostatic testing machine
Test pressure to standard-required.
10, the examination and test of products: include the second time inspection of butt welded seam and pipe end ultrasonic inspection and X-ray；To pipe
End carries out magnetic particle inspection.
By in the welding point heat affected area that such scheme is obtained, the crystallite dimension of IRCGHAZ has subtracted
Little, the distribution of chain M-A constituent element becomes and discontinuously, and the size of M-A constituent element has reduced.Compare
In the welding procedure that the weld heat input of conventional docking X-type groove type, interior weldering and outside weld is suitable, by this
Invent the impact flexibility at the welding point heat affected area that described scheme is obtained to be obviously improved.
Above-mentioned IRCGHAZ refers in the coarse grain zone that the first passage welding is formed, in follow-up welding passage
By the interval (Ac of post bake to critical temperature1～Ac3) formed afterwards.The organizational composition of IRCGHAZ is protected
Stay the coarse grain of former coarse grain zone and the thick tissue of intra-die: upper bainite or granular bainite,
And also the M-A constituent element of continuous distribution, referred to as chain is generated along thick original austenite grain border
M-A constituent element.IRCGHAZ is the region that in welding heat affected zone, toughness is worst, is also to cause heat affected area
There is the basic reason of low value in impact flexibility.
The present invention has redesigned groove type.From bevel shape, outer groove uses compound groove instead,
Increase the opening angle bottom groove to facilitate welding wire to stretch into, the opening angle at outer groove top then diminish with
Reduce welding wire loading；Internal groove still uses double V-groove.From the point of view of from groove size, outer groove depth
Increasing, the internal groove degree of depth reduces.The purpose that groove type changes is the adjustment for welding procedure.Pass through slope
The new change of degree of lip-rounding formula, internally the weld heat input of outer welding bead is redistributed, and increases the weldering of outer welding bead
Wiring energy, in reducing, the heat input of welding bead, can effectively reduce the crystallite dimension of IRCGHAZ, and make
The distribution of chain M-A constituent element becomes discontinuous, so that the toughness of welding point obtains the lifting of entirety.
Claims (9)
1. a manufacture method for X80 pipe line steel ERW, employing wall thickness is 21.4mm,
Width is the X80 pipe line steel flat board of 4485mm, makes the X80 that caliber is Φ 1422mm
Pipe line steel ERW, processing step is as follows:
(1), preparatory process: include X80 Pipeline Steel Plate leveling, steel plate feeding and weldering run-on tab.
(2), milling limit: first rough mill, by edges of boards width mill off 5～10mm；Then finish-milling, as
Shown in accompanying drawing 2, the groove outside tube wall is outer groove, and the groove of inner side is internal groove 6, two
Straight flange between groove is root face 7；Outer groove uses compound groove, is divided into bottom 4 and top
Portion 5, the opening angle 8 bottom outer groove is 45～60 °, the degree of depth 9 bottom outer groove be 2～
3mm；The opening angle 10 at outer groove top is 8～15 °, the degree of depth 11 at outer groove top
It is 5～8mm；The total depth 12 of outer groove is 7～11mm；Internal groove 6 is V-type slope
Mouthful, internal groove opening angle 13 is 30～40 °, and the internal groove degree of depth 14 is 4～6mm；Blunt
Limit thickness 15 is 6～8mm.
(3), UOE or JCOE technological forming；
(4), prewelding；
(5), interior weldering；
(6), outside weld；
(7), the expanding front operation that checks: include removing run-on tab, weld seam and pipe end ultrasonic inspection
And X-ray examination；
(8), pipe expanding；
(9), hydrostatic test；
(10), the examination and test of products.
The manufacture method of X80 pipe line steel ERW the most according to claim 1, its
Be characterised by: the chemical composition (percentage by weight) of X80 pipe line steel flat board is as follows: C 0.04～
0.07, Si 0.15～0.25, Mn 1.68～1.78, Nb 0.04～0.05, Ti 0.01～0.02,
Cu 0.12～0.22, Cr 0.20～0.28, Mo 0.10～0.20, Ni 0.10～0.20, P < 0.015,
S < 0.005, N < 0.006, surplus is Fe.
3. according to the manufacture method of the X80 pipe line steel ERW described in claim 1-2,
It is characterized in that: according to the equipment situation in actual production process, use UOE or JCOE
Moulding process, becomes the caliber to be X80 Pipeline Steel Plate employing UOE or JCOE processes
The steel pipe of Φ 1390 ± 5mm, the unfitness of butt joint≤2.5mm of butting grooves.
4. according to the manufacture method of the X80 pipe line steel ERW described in claim 1-3,
It is characterized in that: prewelding groove root position outside is carried out, use gas shielded arc welding, Welder
Skill parameter is: DC reverse connection, welding current 890～990A, voltage 22～26V, weldering speed 3～4
M/min, gas mixing ratio is CO2:15～25%, Ar:75%～85%, gas flow 40～
60L/min。
5. according to the manufacture method of the X80 pipe line steel ERW described in claim 1-4,
It is characterized in that: interior weldering uses three Lincoln welds of file, and welding condition is: first
Silk is DC reverse connection, electric current 850～1050A, voltage 31～35V；Second and the 3rd for hand over
Stream just connects；The electric current 500～600A of second, voltage 36～40V；The electric current of the 3rd
500～600A, voltage 38～42V；Speed of welding is 1.6～1.8m/min.
6. according to the manufacture method of the X80 pipe line steel ERW described in claim 1-5,
It is characterized in that: outside weld uses four Lincoln welds of file, and welding condition is: first
Silk is DC reverse connection, electric current 1050～1250A, voltage 32～36V；Second to the 4th is
Exchange just connects；Second electric current 750～950A, voltage 36～40V；3rd electric current 600～700
A, voltage 38～42V；4th electric current 550～650A, voltage 38～42V；Speed of welding
It is 1.6～1.8m/min.
7. according to the manufacture method of the X80 pipe line steel ERW described in claim 1-6,
It is characterized in that: according to the equipment situation in actual production process, use hydrostatic expansion or machine
Tool expanding technology, by overall for steel pipe expanding to Φ 1422mm.
8. according to the manufacture method of the X80 pipe line steel ERW described in claim 1-7,
It is characterized in that: hydrostatic test is to carry out the steel pipe after expanding examining by root on hydrostatic testing machine
Test to ensure the test pressure that steel pipe reaches standard-required.
9. according to the manufacture method of the X80 pipe line steel ERW described in claim 1-8,
It is characterized in that: the examination and test of products includes butt welded seam and pipe end ultrasonic inspection and the second of X-ray
Secondary inspection；Pipe end is carried out magnetic particle inspection.
Priority Applications (1)
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| CN201610344663.4A CN105834697B (en) | 2016-05-20 | 2016-05-20 | The manufacture method of X80 pipe line steel ERWs |
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|---|---|---|---|
| CN201610344663.4A CN105834697B (en) | 2016-05-20 | 2016-05-20 | The manufacture method of X80 pipe line steel ERWs |
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Cited By (5)
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| CN106825875A (en) * | 2017-03-10 | 2017-06-13 | 广州增立钢管结构股份有限公司 | A kind of steel pipe vertical seam double-submerged arc technique |
| CN111687238A (en) * | 2020-05-09 | 2020-09-22 | 安徽唐道电子科技有限公司 | Manufacturing method of welded pipe and surface rust prevention treatment method thereof |
| CN112575623A (en) * | 2019-09-27 | 2021-03-30 | 比亚迪股份有限公司 | Butt welding plate group, turnout beam and processing method of butt welding plate group |
| CN112621126A (en) * | 2020-12-14 | 2021-04-09 | 江苏电力装备有限公司 | Welding process of nuclear-grade pipeline carbon steel coil welded pipe |
| CN113211005A (en) * | 2021-04-02 | 2021-08-06 | 中石化石油机械股份有限公司沙市钢管分公司 | Welding method of marine steel pipe with excellent mechanical property |
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| CN112621126A (en) * | 2020-12-14 | 2021-04-09 | 江苏电力装备有限公司 | Welding process of nuclear-grade pipeline carbon steel coil welded pipe |
| CN113211005A (en) * | 2021-04-02 | 2021-08-06 | 中石化石油机械股份有限公司沙市钢管分公司 | Welding method of marine steel pipe with excellent mechanical property |
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| CN105834697B (en) | 2017-09-05 |
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