CN103540867A - X80-level straight seam submerged-arc welded pipe with hydrogen sulfide stress corrosion resistance as well as manufacturing method thereof - Google Patents
X80-level straight seam submerged-arc welded pipe with hydrogen sulfide stress corrosion resistance as well as manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses an X80-level straight seam submerged-arc welded pipe with hydrogen sulfide stress corrosion resistance as well as a manufacturing method thereof. The straight seam submerged-arc welded pipe comprises a welding seam and a welded pipe body, and is characterized in that the welded pipe body consists of the following elements in percent by mass: not greater than 0.04% of C, 0.20%-0.40% of Si, 1.20%-1.80% of Mn, not greater than 0.008% of P, not greater than 0.002% of S, 0.10%-0.30% of Ni, not greater than 0.15% of Cr, not greater than 0.15% of Cu, 0.01%-0.10% of Nb, 0.01%-0.10% of Ti, 0.10%-0.30% of Mo, 0.04%-0.10% of Al, not greater than 0.0005% of B, not greater than 0.002% of Ca, and the balance of Fe and inevitable impurities. According to the X80-level straight seam submerged-arc welded pipe and the manufacturing method thereof disclosed by the invention, the X80 straight seam submerged-arc welded pipe disclosed by the invention has good strength, toughness, welding performance, ductility and corrosion resistance through reasonably deploying and controlling material components, a manufacturing process, a manufacturing technology and subsequent processing. Besides, high-pressure large-flow conveying requirements of oil gas under an acidic environment are satisfied.
Description
Technical field:
The invention belongs to welding field, relate to straight-line joint submerged arc welding tube and manufacture method thereof, especially a kind of X80 level straight-line joint submerged arc welding tube and manufacture method thereof of anti-H 2 S stress corrosion.
Background technology:
High grade of steel, Large Diameter Pipeline have become the general trend of pipeline steel tube development.Improve transportation work pressure, strengthen pipe diameter, can improve transport efficiency, thereby improve the economic benefit of pipeline operation.Along with China's natural gas industrial expansion, long distance pipeline construction will enter high-speed development period in the coming years, and high Grade Pipeline Steel is gathered around and had broad application prospects.The high Grade Pipeline Steel of long distance pipeline that X80 pipe line steel is given priority to as China, has been widely used in China's pipework construction.
Long distance pipeline in process, runs into the strong corrosive mediums such as soil, crude oil or Sweet natural gas under arms conventionally, and wherein many is to be on active service under the conditions such as high temperature, high pressure and high flow rate, and it is more outstanding and serious that its etching problem seems.Long-distance transport pipes pass through desert, marsh and the complex area such as saline and alkaline, and pipeline external wall contacts with the corrosive medium in soil for a long time, inside has the delivery medium of deep-etching, and corrosion condition is very serious.The oil and gas sulphur content in the most of oil fields of China is higher, the generation of a lot of pipeline accidents all with H
2s is relevant.H
2s has one of hazardous medium of corrosive nature most in oil and natural gas, seriously affect the work-ing life of transportation pipe line, and wherein hydrogen induced cracking (HIC) (HIC) and sulfide stress cracking (SSC) (SSCC) are H
2the principal mode of S acid attack, the safety that is restricting pipe-line is on active service.
Stress corrosion cracking (Stress Corrosion Cracking SCC) be metallic substance under the combined action of stress and corrosive medium, a kind of low stress brittle fracture phenomenon of generation.Stress corrosion cracking is a kind of failure mode premonitory that do not have, and the loss causing is very huge.Along with the exploitation of severe cold areas oil-gas field and the raising of pipeline transfer pressure and steel grade, the problem of pipeline generation brittle rupture is particularly outstanding.Pressure pipeline is as a kind of typical welded construction, because welding process often makes the stress concentration that structure property is deteriorated and welding flaw place is serious of welding joint, make welding flaw place become weak part in whole welded pipe line, in military service process, often become the source of crackle.And cooling formation technic in tubulation process is improper, also can cause the harmful unrelieved stress of welded tube excessive, affect pipe safety.
From the acid military service steel pipe of external production development trend, low-carbon alloy steel pipe is from the eighties with X60 grade of steel, and it is main to the nineties grade of steel, being promoted to X65, then develops into up till now X70 grade of steel.The companies such as Nippon Steel, JFE and Di Sen-Krupp can be mass and supply the corrosion-resistant pipeline steel pipe of X70.Europe steel pipe has the developing history of nearly 30 years antiacid pipe line steels, within 2005, develops into the antiacid pipe line steel of X70.Europe steel pipe mainly adopts be Ultra-low carbon, super low sulfur, low manganese, low-phosphorous Composition Design to reduce the segregation of the elements such as carbon, manganese, sulphur, phosphorus, the microalloying by niobium, vanadium makes its performance meet well the requirement of antiacid line pipe.External corrosion-resistant pipeline steel proportion of production is up to more than 65% at present.Domestic batch is for on-the-spot resistance to H
2the welded tube of S corrosion is still X52 (L360).For a long time, domestic acid military service steel pipe adopts import steel pipe in a large number.In the existing technology of granted patent, what patent No. ZL201110297210.8 related to is a kind of X65MS grade of steel spiral welded tube and manufacture method thereof, what patent No. ZL201110331254.8 related to is a kind of spiral submerged welded pipe and manufacture method thereof of X70MS grade of steel, and above two kinds of welded tube SSCC test loading stress level is 72% nominal stress; What patent No. ZL00123185.5, ZL200710193032.8, ZL200910033695.2 related to is a kind of hydrothion corrosion resistant pipe steel; What patent No. ZL200610016498.6 related to is a kind of hydrogen sulfide corrosion resistant weldless steel tube; Thereby, in current existing patented technology, do not relate to X80MS grade of steel, and possess straight-line joint submerged arc welding tube and the manufacture method thereof of anti-H 2 S stress corrosion ability.In addition, existing application is in publication file, and 201210026833.6 what relate to is a kind of high-strength seamless steel pipe; 201310177193.3 related is a kind of weldless steel tube material and manufacture method thereof; 201310032759.3 related is a kind of L360MS straight-line joint submerged arc welding tube and production method thereof; 201310150492.8 related to a kind of acid-proof pipe welding wire for submerged-arc welding; 201310150513.6 related to a kind of 80ksi level petroleum casing pipe and manufacture method thereof; 200310119050.3 related to a kind of anti-H 2 S pipe line steel and production method thereof; 200410025443.2 what relate to is a kind of production method of anti-hydrogen sulfide steel.Thereby existing authorized or publication technology in, all do not relate to 80ksi steel grade sulfur resistant hydrogen stress corrosion straight-line joint submerged arc welding tube and manufacture method thereof.
Along with " going into full operation and the arriving of Sino-Russian, Sino-Kazakhstan transnational oil and gas pipes upsurge in construction of West-east Gas natural gas line; oil-gas field is gradually to resource progress such as extremely frigid zones, sea and high sulfur-bearings; the security of gas pipeline use becomes the problem that academia is generally concerned about, thereby pipeline material is had higher requirement.
The concentration of hydrogen sulfide content containing in China's most of oil gas field is higher, and part gathering line belongs to acid attack environment, and the steel pipe of use is mainly the acid-proof pipe of low strength X52 grade of steel, because intensity is low, cannot bear high-pressure high-flow and carry.Along with the strength increase of pipe line steel, hardness generally increases.Because hardness and steel strength are closely related, and H 2 S stress corrosion susceptibility is relevant with the hardness of steel, hardness is higher, and susceptibility is larger.Thereby along with transportation pipe line steel strength, hardness raise, very easily there is SSCC, be therefore badly in need of high-strength X 80 acid resistance steel pipe for exploitation corrosive environment.
Summary of the invention:
The object of the invention is to overcome the shortcoming of above-mentioned prior art, a kind of X80 level straight-line joint submerged arc welding tube and manufacture method thereof of anti-H 2 S stress corrosion are provided, by rational allocation and the control of material composition, manufacturing process, manufacturing technology and subsequent disposal, make X80 straight-line joint submerged arc welding tube possess good intensity, toughness, weldability, ductility and solidity to corrosion.The high-pressure high-flow that meets sour environment oil gas is carried requirement.
The technical problem to be solved in the present invention is to provide body high strength, possesses X80 steel-grade straight-line joint submerged arc welding tube and the manufacture method thereof of anti-H 2 S environmental stress corrosive nature simultaneously.
For solving the problems of the technologies described above, the invention provides a kind of X80 level straight-line joint submerged arc welding tube and manufacture method thereof of anti-H 2 S stress corrosion, main technical schemes is as follows:
A kind of X80 level straight-line joint submerged arc welding tube and manufacture method thereof of anti-H 2 S stress corrosion, the method comprises the following steps: steel plate milling limit, edges of boards pre-bending, steel pipe JCO moulding, prewelding, interior weldering, outside weld, destressing hole enlargement, the water test, chamfered edge, groove processing, X-ray examination, ultrasound investigation, magnetic particle inspection, online spray mark and finished product inspection.
Described body is elementary composition by following mass percent: C≤0.04, Si:0.20～0.40, Mn1.20～1.80, P≤0.008, S≤0.002, Ni0.10～0.30, Cr≤0.15, Cu≤0.15, Nb0.01～0.10, Ti0.01～0.10, Mo0.10～0.30, Al0.04～0.10, B≤0.0005, Ca≤0.002, all the other are iron and inevitable impurity.
Described steel pipe seam is elementary composition by following mass percent: C0.02～0.08; Si0.2～0.5; Mn0.8～1.6; P≤0.015; S≤0.005; Cr≤0.30; Mo0.15～0.35; Al≤0.010; Ti0.01～0.10; B0.001～0.008; ; All the other are Fe and inevitable impurity.
Described steel plate is that banded structure is controlled at 0.5 grade of following pure controlled rolling steel plate of height, and its metallographic microstructure is acicular ferrite, homogeneous microstructure, and grain fineness number is 12 grades or thinner.
The technique on described steel plate milling limit is two millings limit technique, first rough mills I type groove, and then finish-milling X-type groove, goes up 70 °～110 ° of groove angles, 60 °～90 ° of lower groove angles, the high 6～8mm of root face behind finish-milling limit.
The technique of described interior weldering is: adopt three union melt weldings groove inside steel pipe to weld, the number one welding wire of interior weldering adopts DC reverse connection, and No. second welding wire, No. three welding wire adopt and exchange; Number one welding wire electric current 900 ± 100A, voltage 33 ± 1V; No. second welding wire electric current 750 ± 50A, voltage 35 ± 1V; No. three welding wire electric current 650 ± 50A, voltage 37 ± 1V; Welding speed is 1.6～1.8m/min.
The technique of described outside weld is: adopt three union melt weldings groove outside steel pipe to weld, the number one welding wire of outside weld adopts DC reverse connection, and No. second welding wire, No. three welding wire adopt and exchange; Number one welding wire electric current 1150 ± 150A, voltage 33 ± 1V; No. second welding wire electric current 900 ± 100A, voltage 36 ± 1V; No. three welding wire electric current 600 ± 100A, voltage 39 ± 1V; Welding speed is 1.6～1.8m/min.
By above scheme, develop a kind of high-strength X 80 MS grade of steel hydrogen sulfide corrosion-resistant straight-line joint submerged arc welding tube, its manufacturing process technology comprises the following steps:
1) steel plate milling limit: choose steel plate according to the diameter of Steel Pipe Design and thickness, 70 °～110 ° of outside weld groove angles, 60 °～90 ° of lower groove angles behind milling limit, the width of root face 6～8mm; , to obtain accurate steel plate width and groove shape;
2) steel plate pre-bending; Charging stand is by steel plate transmission to crimp station, and the extruding by upper and lower mould makes steel plate deformed reach the requirement of moulding process design radian;
3) steel plate JCO moulding; To different wall, the steel pipe of different tube diameters, according to on-the-spot spring-go amount analysis of experiments, first steel plate is used to forming machine bending on one side, make steel plate become " J " shape, then by its symmetrical bending on one side in addition, steel plate cross section becomes " C " shape, finally steel plate is pressed into " O " shape from steel plate middle part, by reasonable setting punching press number of times and punching press amount, guarantees to there is good circularity and low unrelieved stress after steel pipe forming.
4) prewelding: prewelding adopts MAG welding process, pipe is carried out to continuous welding and complete joint close operation;
5) weldering in: adopt three union melt weldings groove inside steel pipe to weld, a welding wire of interior weldering adopts DC reverse connection, to ensure enough fusion penetrations.Second, third silk adopts and exchanges, attractive in appearance to guarantee filling and the welding bead of weld seam;
6) outside weld: adopt three union melt weldings groove outside steel pipe to weld, the technique of outside weld operation is: adopt three union melt weldings groove inside steel pipe to weld, a welding wire of external welding adopts DC reverse connection, to ensure enough fusion penetrations.Second, third silk adopts and exchanges, attractive in appearance to guarantee filling and the welding bead of weld seam;
7) welding wire adopts special-purpose high tenacity hydrogen sulfide corrosion-resistant welding wire;
8) solder flux adopts alkaline solder flux;
9) X-ray examination and ultrasound investigation for the first time: butt welded seam and heat affected zone are detected;
10) machinery expanding: after moulding, welding, steel pipe carries out total length hole enlargement, and enlarging rate is 0.6～1.4%;
11) water test: the steel pipe after hole enlargement is carried out to the water test;
12) pipe end slope-mouth processing: size is at steel pipe two ends finished edge as requested;
13) X-ray examination and ultrasound investigation for the second time: butt welded seam and heat affected zone are detected;
14) appearance and dimension check: as requested steel pipe apparent size is measured.
Adopt the know-why of above processing step as follows:
Raw material: the steel plate for the manufacture of welded tube adopts ultralow C, low Mn Composition Design, adopt high pure smelting technology and inclusion modification treatment technology, strict P, the S impurity content controlled, wherein S foreign matter content is controlled to below 0.002, thereby greatly reduce the inclusion contents such as MnS, make sheet material homogeneous microstructure, high purity, banded segregation is few.Add the alloying elements such as a certain amount of Cr, Mo, reduce in material the subsurface defects such as element segregation, banded structure, reduce hydrogen atom and assemble forming core particle, improve the anti-H of sheet material
2s corrosive power, adds a certain amount of Nb, Ti microalloy element, and crystal grain thinning guarantees that sheet material has high obdurability.
Milling limit: specially designed groove size can be optimized the penetration ratio of material in welding process, controls composition of weld line and heat affected zone performance, and finally guarantees that the hardness at welding joint position is no more than standard-required.Simultaneously preferred milling limit operation is to guarantee that coiled sheet can through welding in welding process, and improve welding speed, and improve weld seam pattern, reduce weld heat input as far as possible, reduce the impact of welding residual stress and welding heat input butt welded seam tissue and performance, improve Weld Performance.
Steel plate pre-bending: steel plate is on roller-way after centering, and charging stand is by steel plate transmission to crimp station, and after pre-bending, steel plate straight flange width is less than thickness of slab, the extruding by upper and lower mould makes steel plate deformed reach the requirement of moulding process design radian.
JCO low-stress is controlled: in order to reduce JCO moulding stress, and JCO moulding stress is circumferentially disperseed more at body, pressing process, by optimizing pressing process, adopts less step-length, reduces draught.First according to shaping steel tube size, adjust die forming machine, on one side first steel plate is used to forming machine bending, make steel plate become " J " shape, on one side then by its symmetrical bending in addition, steel plate cross section becomes " C " shape, finally steel plate is pressed into " O " shape in the middle part of steel plate.Wherein, punching press number of times, forming machine step-length and punching press amount design according to steel pipe sizes.Press the first piece two step to use compared with light reduction, when moulding curvature is inadequate, increase gradually again draught steel pipe is depressed into desired curvature, thereby effectively control circumferential unrelieved stress.
Inside and outside astute and able: the selection of welding setting, take into full account in three wire bonds each effect, regulate each electric current, voltage, elongation, angle and silk spacing, guarantee the fusion penetration of weld seam and good weld seam pattern, reasonably select low heat input in scope as far as possible, guarantee that weld seam has excellent toughness.
Adopt the hydrogen sulfide corrosion-resistant welding wire of new research and development, by interpolation Mo, Ti, B, make up weld strength, improve again solidity to corrosion simultaneously.Mo is the most effective resistance to H
2s corrodes element, can be together with S disperse educt, Mo
2c is also the trap of S.The combined action of Ti, B promotes the formation of tiny acicular ferrite in weld seam, guarantees that weld seam has hydrogen sulfide corrosion-resistant ability and obdurability.
Adopt alkaline hydrogen sulfide corrosion-resistant solder flux, coordinate special welding wire, can reach better Weld Performance.What common pipe line steel solder flux was selected is common raw material, P, S impurity element are many, and hydrogen sulfide corrosion-resistant solder flux to select be all high cleanliness raw material, the impurity such as the P in solder flux, S content are all lower, so the P, the S content that are transitioned in welding process in weld seam are low, also reduce the convergence point of hydrogen, strengthened resistance to HIC and the SSCC ability of weld seam.Raw material is welded after proportioning, and the solder flux slag detachability of developing, arc-stabilising, formability and degassed property etc. are all very good.
Weld seam soft is controlled: for improving the anti-SSCC ability of high-strength X 80 MS straight-line joint submerged arc welding tube, need butt welded seam hardness strictly to control in welding process, Hardness Control is mainly carried out from welding material and two aspects of weldprocedure.In hydrogen sulfide corrosion-resistant wlding, all reduce as far as possible Mn, Si and alloy equal size, avoid these elements to be too much transitioned in weld seam in welding process, cause that weld hardness raises.According to thickness of slab, in adjusting welding process, each electric current, voltage, elongation, angle and silk spacing, be controlled at t8/5 within the scope of 18～25s, can reduce the formation of thick hardened structure.
Expanding technology: according to the size and dimension of steel pipe after moulding, determine best expanding technology, discharge stress in mother metal and weld seam, reduce stress concentration, prevention SSCC occurs, and guarantee that size after pipe expanding, shape and performance meet the demands.
The water test: carry out the water test, intensity and the tightness of check steel pipe, further discharge stress.
Beneficial effect of the present invention is: X80 straight-line joint submerged arc welding tube of the present invention has possessed good intensity, toughness, weldability, ductility and solidity to corrosion, and the high-pressure high-flow that meets sour environment oil gas is carried requirement.
Embodiment:
Embodiment 1: Ф 813 * 15.3mmX80MS grade of steel hydrogen sulfide corrosion-resistant straight-line joint submerged arc welding tube is manufactured
1) raw material
Adopt the X80MS steel plate that wall thickness is 15.3mm, its chemical composition analysis is as following table 1:
Table 1X80MS chemical composition analysis (%)
| C | Si | Mn | P | S | Cr | Cu | Ni | Mo | Nb | Ti | Al | B | Ca |
| 0.032 | 0.29 | 1.59 | 0.007 | 0.0009 | 0.09 | 0.11 | 0.17 | 0.22 | 0.06 | 0.07 | 0.07 | 0.0003 | 0.0008 |
2) steel plate milling limit and pre-bending: 80 ° of upper groove angles, 75 ° of lower groove angles behind milling limit, width of root face 6mm;
3) to the steel plate behind milling limit on roller-way after centering, the extruding by upper and lower mould makes steel plate deformed reach the requirement of moulding process design radian;
4) steel plate JCO moulding; Adopt drawing method progressively, moulding curvature R388.2mm, is first pressed into " J " type by half of steel plate through 9 times, adopt the same method and carry out second half through 9 compactings, become " C " type, forming machine step-length 114.8mm, is finally pressed into " O " type in the centre of steel plate.Whole compacting Dao Shuo 19 roads, each draught 3～1mm; Less step-length, more compacting number of times reduces unrelieved stress;
5) prewelding: prewelding adopts MAG welding process, pipe is carried out to continuous welding and complete joint close operation;
6) weldering in: adopt three union melt weldings groove inside steel pipe to weld.Weldprocedure: number one welding wire electric current 900A, voltage 33V; No. second welding wire electric current 750A, voltage 35V; No. three welding wire electric current 650A, voltage 37V; Welding speed is 1.70m/min; Welding material adopts welding wire and the solder flux of research and development;
7) outside weld: adopt three union melt weldings groove outside steel pipe to weld.Weldprocedure: number one welding wire electric current 1000A, voltage 34V; No. second welding wire electric current 750A, voltage 37V; No. three welding wire electric current 550A, voltage 40V; Welding speed is 1.70m/min;
8) machinery expanding: after moulding, welding, steel pipe carries out total length 1.0% hole enlargement, guarantees the shape of pipe, improves the stress distribution of steel pipe;
9) water test: the steel pipe after hole enlargement is carried out to hydrostatic test, and test pressure is 20.7Mpa, and the dwell time is greater than 15s;
10) pipe end slope-mouth processing: pipe end is processed, and groove angle is 22 °～25 °, and root face is 1.6 ± 0.8mm;
11) ultrasonic testing: 100% ultrasound examination is for the second time carried out in butt welded seam and heat affected zone, the defect producing for detection of hole enlargement, hydraulic pressure;
12) X-ray examination: steel pipe inner and outer welding is carried out to 100% industrial television inspection and pipe end film making, the defect producing for detection of hole enlargement, hydraulic pressure;
13) appearance and dimension check: as requested steel pipe apparent size is measured;
Steel pipe physics and chemistry and corrosion resisting property are as follows:
1) cross directional stretch performance
Table 2 cross tensile test result
2) Charpy impact toughness, DWTT and pliability test result
Table 3 impact, DWTT and pliability test result
3) welding joint Vickers' hardness
Table 4 mother metal, Seam and heat effected zone Vickers' hardness (HV
10)
4) corrosion resisting property test
Table 5 acid-proof pipe HIC sensitive parameter test result
| Test piece number (Test pc No.) | CSR(％) | CLR(％) | CTR(％) |
| Mother metal | 0，0，0 | 0，0，0 | 0，0，0 |
| Weld seam | 0，0，0 | 0，0，0 | 0，0，0 |
| Heat affected zone | 0，0，0 | 0，0，0 | O，0，0 |
| API requirement | ≤2 | ≤15 | ≤5 |
Table 6 button SSCC test result
Embodiment 2: Ф 813 * 17.5mm X80MS grade of steel hydrogen sulfide corrosion-resistant straight-line joint submerged arc welding tube is manufactured
1) raw material
Adopt the X80MS steel plate that wall thickness is 17.5mm, its chemical composition analysis is as following table:
Table 7:X80MS chemical composition analysis
| C | Si | Mn | P | S | Cr | Cu | Ni | Mo | Nb | Ti | Al | B | Ca |
| 0.032 | 0.30 | 1.58 | 0.007 | 0.0009 | 0.09 | 0.12 | 0.17 | 0.23 | 0.06 | 0.07 | 0.06 | 0.0003 | 0.0007 |
2) steel plate milling limit and pre-bending: 100 ° of upper groove angles, 80 ° of lower groove angles behind milling limit, width of root face 8mm;
3) to the steel plate behind milling limit on roller-way after centering, the extruding by upper and lower mould makes steel plate deformed reach the requirement of moulding process design radian;
4) steel plate JCO moulding: adopt drawing method progressively, moulding curvature R386.2mm, is first pressed into " J " type by half of steel plate through 9 times, adopt the same method and carry out second half through 9 compactings, become " C " type, forming machine step-length 114.2mm, is finally pressed into " O " type in the centre of steel plate.Whole compacting Dao Shuo 19 roads, each draught 3～1mm.Less step-length, more compacting number of times reduces unrelieved stress;
5) prewelding: prewelding adopts C0
2welding process, carries out continuous welding to pipe and completes joint close operation;
6) weldering in: adopt three union melt weldings groove inside steel pipe to weld.Weldprocedure: number one welding wire electric current 960A, voltage 33.5V; No. second welding wire electric current 750A, voltage 35.5V; No. three welding wire electric current 650A, voltage 37V; Welding speed is 1.7m/min; Welding material adopts high-toughness welding wire and the solder flux of research and development;
7) outside weld: adopt three union melt weldings groove outside steel pipe to weld.Weldprocedure: number one welding wire electric current 1100A, voltage 34V; No. second welding wire electric current 850A, voltage 37V; No. three welding wire electric current 700A, voltage 40V; Welding hastens as 1.7m/min; Welding material adopts high-toughness welding wire and the solder flux of research and development;
8) machinery expanding: after moulding, welding, steel pipe carries out total length 1.0% hole enlargement, guarantees the shape of pipe, improves the stress distribution of steel pipe;
9) water test: the steel pipe after hole enlargement is carried out to hydrostatic test, and test pressure is 23.9Mpa, and the dwell time is greater than 15s;
10) pipe end slope-mouth processing: pipe end is processed, and groove angle is 22 °～25 °, and root face is 1.6 ± 0.8mm;
11) ultrasonic testing: 100% ultrasound examination is for the second time carried out in butt welded seam and heat affected zone, the defect producing for detection of hole enlargement, hydraulic pressure;
12) X-ray examination: steel pipe inner and outer welding is carried out to 100% industrial television inspection and pipe end film making, the defect producing for detection of hole enlargement, hydraulic pressure;
13) appearance and dimension check: as requested steel pipe apparent size is measured;
Steel pipe physics and chemistry and corrosion resisting property are as follows:
1) cross directional stretch performance
Table 8 cross tensile test result
2) Charpy impact toughness, DWTT and pliability test result
Table 9 impact, DWTT and pliability test result
3) welding joint Vickers' hardness
Table 10 mother metal, Seam and heat effected zone Vickers' hardness (HV
10)
4) corrosion resisting property test
Table 11 acid-proof pipe HIC sensitive parameter test result
| Test piece number (Test pc No.) | CSR(wt) | CLR(wt) | CTR(wt) |
| Mother metal | 0，0，0 | 0，0，0 | 0，0，0 |
| Weld seam | 0，0，0 | 0，0，0 | 0，0，0 |
| Heat affected zone | 0，0，0 | 0，0，0 | 0，0，0 |
| API requirement | ≤2 | ≤15 | ≤5 |
Table 12 button SSCC test result
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the method for above-mentioned announcement and technology contents to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, still belong in the scope of technical solution of the present invention.
Claims (7)
1. an X80 level straight-line joint submerged arc welding tube for anti-H 2 S stress corrosion, comprises weld seam and welded tube body, it is characterized in that: described welded tube body is elementary composition by following mass percent: C≤0.04, Si:0.20～0.40, Mn1.20～1.80, P≤0.008, S≤0.002, Ni0.10～0.30, Cr≤0.15, Cu≤0.15, Nb0.01～0.10, Ti0.01～0.10, Mo0.10～0.30, Al0.04～0.10, B≤0.0005, Ca≤0.002, all the other are iron and inevitable impurity.
2. X80 level straight-line joint submerged arc welding tube as claimed in claim 1, it is characterized in that: described welded tube is made by steel plate, steel plate is that banded structure is controlled at 0.5 grade of following pure controlled rolling steel plate of height, and the metallographic microstructure of steel plate is acicular ferrite, homogeneous microstructure, grain fineness number is 12 grades or thinner.
3. X80 level straight-line joint submerged arc welding tube as claimed in claim 1, is characterized in that, described steel pipe seam is elementary composition by following mass percent: C0.02～0.08; Si0.2～0.5; Mn0.8～1.6; P≤0.015; S≤0.005; Cr≤0.30; Mo0.15～0.35; Al≤0.010; Ti0.01～0.10; B0.001～0.008; ; All the other are Fe and inevitable impurity.
4. the manufacture method of X80 level straight-line joint submerged arc welding tube as claimed in claim 1, it is characterized in that, comprise the following steps: steel plate milling limit, edges of boards pre-bending, steel pipe JCO moulding, prewelding, interior weldering, outside weld, destressing hole enlargement, the water test, chamfered edge, groove processing, X-ray examination, ultrasound investigation, magnetic particle inspection, online spray mark and finished product inspection.
5. manufacture method as claimed in claim 4, it is characterized in that: the technique on described steel plate milling limit, for two millings limit technique, is first rough milled I type groove, then finish-milling X-type groove, 70 °～110 ° of upper groove angles, 60 °～90 ° of lower groove angles behind finish-milling limit, the high 6～8mm of root face.
6. manufacture method as claimed in claim 4, is characterized in that, the technique of described interior weldering is: adopt three union melt weldings groove inside steel pipe to weld, the number one welding wire of interior weldering adopts DC reverse connection, and No. second welding wire, No. three welding wire adopt and exchange; Number one welding wire electric current 900 ± 100A, voltage 33 ± 1V; No. second welding wire electric current 750 ± 50A, voltage 35 ± 1V; No. three welding wire electric current 650 ± 50A, voltage 37 ± 1V; Welding speed is 1.6～1.8m/min.
7. manufacture method as claimed in claim 4, is characterized in that, the technique of described outside weld is: adopt three union melt weldings groove outside steel pipe to weld, the number one welding wire of outside weld adopts DC reverse connection, and No. second welding wire, No. three welding wire adopt and exchange; Number one welding wire electric current 1150 ± 150A, voltage 33 ± 1V; No. second welding wire electric current 900 ± 100A, voltage 36 ± 1V; No. three welding wire electric current 600 ± 100A, voltage 39 ± 1V; Welding speed is 1.6～1.8m/min.
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Effective date of registration: 20170525 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Co-patentee after: Baoji Petroleum Steel Pipe Co., Ltd. Patentee after: China National Petroleum Corporation Address before: 721008, 10 Tan Tan Road, Shaanxi, Baoji Patentee before: Baoji Petroleum Steel Pipe Co., Ltd. |