CN103540834B - The X65MS/X70MS spiral submerged welded pipe that a kind of anti-SSCC stress corrosion is excellent and manufacture method thereof - Google Patents

The X65MS/X70MS spiral submerged welded pipe that a kind of anti-SSCC stress corrosion is excellent and manufacture method thereof Download PDF

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CN103540834B
CN103540834B CN201310470450.2A CN201310470450A CN103540834B CN 103540834 B CN103540834 B CN 103540834B CN 201310470450 A CN201310470450 A CN 201310470450A CN 103540834 B CN103540834 B CN 103540834B
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x65ms
sscc
x70ms
welding
corrosion
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CN103540834A (en
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毕宗岳
黄晓辉
牛辉
张锦刚
刘海璋
张万鹏
牛爱军
赵红波
张君
刘斌
陈长青
杨军
包志刚
杨耀彬
刘刚伟
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China National Petroleum Corp
Baoji Petroleum Steel Pipe Co Ltd
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Baoji Petroleum Steel Pipe Co Ltd
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Abstract

The invention discloses the excellent X65MS/X70MS spiral submerged welded pipe of a kind of anti-SSCC stress corrosion and manufacture method thereof, in welded tube making processes, the main technology such as shaping, the anti-corrosion welding wire of low-stress and solder flux welding, hot input line energy hole that adopts can obtain the excellent X65MS/X70MS steel grade spiral seam submerged arc welded pipe of high strength, high tenacity, anti-SSCC stress corrosion.X65MS/X70MS steel grade spiral seam submerged arc welded pipe of the present invention, has excellent resistance to H 2s corrodibility, adopts NACE TM0177 standard to carry out SSCC test in solution A, applies 90% σ smore than specify yield strength stress level, sample tensile surface is intact, does not occur any cracking, is applicable to high-pressure high-flow oil gathering and transportation pipelines or the use of conveying acid oil gas medium.

Description

The X65MS/X70MS spiral submerged welded pipe that a kind of anti-SSCC stress corrosion is excellent and manufacture method thereof
Technical field:
The invention belongs to oil country tubular goods field, relate to submerged-arc welded (SAW) pipe and manufacture method thereof, especially a kind of X65MS/X70MS grade of steel spiral submerged welded pipe of excellent anti-SSCC stress corrosion and manufacture method thereof.
Background technology:
H 2the existence of S causes the cracking danger of high-yield strength low alloy steel.The hydrogen accumulation area cracking that SSCC cracking is applied stress, unrelieved stress and hydrogen pressure acting in conjunction cause, cracking direction is perpendicular to pipe face and have the feature of delaying.
In the process of SSCC, the Main Function of stress is that metal is strained, and produces slippage, promotes that SSCC crack nucleation, expansion are until fracture.Wherein stress main source has load, unrelieved stress and corrosion product.
The whole world is high containing H 2s gas production will reach 40,000,000,000 sides, account for 30%, and the concentration of hydrogen sulfide content contained in China's most of oil gas field is higher, comparatively large to the demand of acid-proof pipe, particularly load H 2s, cannot bear high-pressure high-flow conveying.Patent publication No. CN102121081A adopts HFW welding process, SSCC stress loading 85% σ sand do not rupture, but loading 90% σ cannot be born sstress.Patent publication No. CN102628145A, SSCC stress loading is more than 90% σ sand do not rupture, but belong to weldless steel tube, through Overheating Treatment, cost to be added.The resistance to acid X65MS that patent publication No. CN102330034A and CN102330032A mainly introduces and the anti-SSCC stress corrosion of X70MS grade of steel spiral welded tube only reach regulation yield strength 72% σ s, very easily there is SSCC.Stress intensity is SSCC most critical index, and SSCC counter stress size is very sensitive.External loading 72% σ sbe minimum threshold, and domestic manufacture welded steel pipe unrelieved stress is large, homogeneity of structure is poor, SSCC stress loading is more than 72% σ sabove, loading just cracks and ruptures.Exploitation one can bear 90% σ sthe spiral submerged welded pipe that above high-yield strength anti-SSCC stress corrosion is excellent and manufacture method imperative.
Summary of the invention:
The object of the invention is to the shortcoming overcoming above-mentioned prior art, the X65MS/X70MS spiral submerged welded pipe providing a kind of anti-SSCC stress corrosion excellent and manufacture method thereof.
The technical problem to be solved in the present invention is to provide body high strength, applies 90% σ sthe X65MS/X70MS grade of steel hydrogen sulfide corrosion-resistant spiral submerged welded pipe of the anti-SSCC stress corrosion of yield strength and manufacture method thereof.
The X65MS/X70MS spiral submerged welded pipe that a kind of anti-SSCC stress corrosion is excellent and manufacture method thereof, the chemical composition of described welded tube is C :≤0.05wt%, Si:0.10 ~ 0.30wt%, Mn :≤1.20wt%, P :≤0.008wt%, S :≤0.001wt%, Cu :≤0.25wt%, Ni :≤0.25wt%, Cr :≤0.1wt%, Nb :≤0.10wt%, V :≤0.05wt%, Ti :≤0.06wt%, Mo :≤0.30wt%, Al :≤0.035wt%, B≤0.0002wt%, all the other are iron and inevitable impurity.
Develop the X65MS/X70MS spiral submerged welded pipe manufacturing technology scheme that a kind of anti-SSCC stress corrosion is excellent, comprise the following steps: uncoiling, leveling, milling limit, pre-bending, shaping, interior weldering, outside weld, Length-fixing cutting, pipe end are expanding, ultrasound investigation, X-ray examination, hydraulic pressure, pipe end chamfered edge, finished product inspection.
1) steel plate milling limit: choose steel plate according to the diameter of Steel Pipe Design and thickness, during milling limit, each milling of interior outside weld groove angle is become 60 ° ~ 110 °, the width of root face 7 ~ 10mm, with " tight inside but loose outside " phenomenon produced after eliminating joint close, obtain the bevel shape being conducive to shaping occlusion.
2) steel plate forming; According to roll bending yield strength level in kind, adopt forming by external control mode, mainly adjust 1#, 2# and 3# roller spacing and inclination angle, the rollers such as all the other 4#, 5# coordinate circularity shaping.
3) weldering in: adopt anti-corrosion welding wire and solder flux to weld, the technique of interior weldering is: number one welding wire adopts DC reverse connection, electric current 1100 ± 400A, voltage 32 ± 5V; No. second welding wire adopts and exchanges, electric current 450 ± 80A, voltage 34 ± 5V; Welding speed is 1.50 ~ 2.00m/min.
4) outside weld: the technique of outside weld is: number one welding wire adopts DC reverse connection, electric current 1200 ± 400A, voltage 33 ± 5V; No. second welding wire adopts and exchanges, electric current 450 ± 80A, voltage 34 ± 5V; Welding speed is 1.50 ~ 2.00m/min.
5) adopt stress to be that 90% ~ 100% SMYS carries out hydrostatic test, make body and weld seam have low unrelieved stress, low-stress shaping prevention SSCC occurs.
6) X-ray examination and ultrasound investigation: Welded Joints and pipe mother detect;
7) pipe end slope-mouth process: size is at steel pipe two ends finished edge as requested;
8) appearance and dimension check: as requested steel pipe apparent size is measured;
The resistance to H of X65MS/X70MS grade of steel of the present invention 2s spiral submerged welded pipe, carries out SSCC test, at 90% σ sdo not rupture under high-yield strength stress corrosion.In sheet material design, the ultralow C Composition Design of main employing, adopts high-purity smelting technology and inclusions class technology, especially below 0.001wt% is controlled to S foreign matter content, thus greatly reduce the inclusion contents such as MnS, make sheet material homogeneous microstructure, high purity, banded segregation is few.The content of C, Mn, P and S reduces the anti-SSCC performance being conducive to improving steel.Add in the microalloy element such as Cr, Ni and Cu one or more, the subsurface defect such as element segregation, banded structure in reduction material, reduces while hydrogen atom assembles forming core particle, improves the anti-H of sheet material 2s corrosive power and intensity, and a certain amount of Nb element of appropriate interpolation guarantees that sheet material has certain obdurability.
Low-stress molding control technology: according to roll bending yield strength level in kind, adopt forming by external control mode, according to shaping steel tube size adjustment rotating disk angle, precision measurement controls position and the angle of each format roll, adjustment 1# and 3# roller spacing and inclination angle, by measuring pipe ring spring-go amount, Reasonable adjustment 2# roller draught, pipe ring hoop spring-go amount can be controlled, for negative value, to have good circularity and low unrelieved stress after guaranteeing steel pipe forming, prevention SSCC occurs.
Adopt anti-corrosion welding wire and solder flux welding: resistance to H 2the welding wire for submerged-arc welding of S corroded pipeline steel welding, is characterized in that chemical component weight per-cent is: C≤0.06; Mn≤1.0; Si≤0.20; P≤0.010; S≤0.003; Cr≤0.30; Mo≤0.25; Al≤0.010; B≤0.008; All the other are Fe.The present invention, on ultralow-carbon basis, reduces Mn content, strictly control P, S add-on, rationally to add in Cr, Mo, B and associating mother metal the comprehensive actions such as Cu, Ti, ensure that weld seam has good mechanical property and anti-SSCC performance.Solder flux adopts high alkalinity, hydrogen sulfide corrosion-resistant solder flux, and its main chemical compositions is CaF 2: 14 ~ 18wt%, CaO+MgO:26 ~ 30wt%, Al 2o 3+ MnO :≤25wt%, SiO 2:≤20wt%, S :≤0.008wt%, P :≤0.015wt%.Adopt the resistance to H of high cleanliness 2s welding wire, solder flux welding, seam organization is even, and in weld seam, S, P content is low.Be transitioned into Mo in weld seam as the most effective resistance to H 2s eroded elements, can 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 X65MS/X70MS grade of steel spiral submerged welded pipe SSCC tests at 90% σ sthe anti-SSCC ability of weld seam under regulation yield strength stress.
Preferred milling limit operation: ensure that coiled sheet can through welding in welding process, and improve welding speed, improve seam center, reduce weld heat input, thus reduce the impact of welding residual stress and thermal weld stress butt welded seam structure and properties, improve the anti-SSCC performance of weld seam.
Hot input line energy hole tissue: preferably inside and outside Welding, guarantees that weld seam crystal grain under welding heat effect is tiny, homogeneous microstructure.When carrying out the selection of welding setting, take into full account the effect of each silk in Double Wire Welding, regulate the electric current of each silk, voltage, elongation, angle and silk spacing, guarantee the fusion penetration of weld seam and good seam center, select low heat input as far as possible, according to different strip thickness control weld heat input, guarantee that weld seam forms the acicular ferrite structure of more than 90% and a small amount of bainite structure, reduce pro-eutectoid, the ferritic formation such as side plate bar, make the chemical composition of Seam and heat effected zone even, crystal grain is tiny, microstructure segregation is few, guarantee that weld seam possesses good toughness and lower hardness simultaneously, improve the anti-SSCC performance of weld seam.
Weld seam soft controls: for improving the anti-SSCC ability of X65MS/X70MS grade of steel spiral submerged welded pipe tubing, need butt welded seam tissue and hardness to control in welding process.Reduce Mn, Si and alloy equal size in hydrogen sulfide corrosion-resistant wlding all as far as possible, avoid these elements to be too much transitioned in weld seam in welding process, cause weld hardness to raise.On the other hand, regulate the electric current of each silk in welding process, voltage, elongation, angle and silk spacing, suitably select smaller heat input, according to thickness of slab, t8/5 is controlled within the scope of 15s ~ 32s, reach the form and speed of cooling that affect weld seam molten bath, while guaranteeing certain intensity, lower weld hardness tissue can be formed, improve the anti-SSCC performance of weld seam.
The water test: adopt stress to be that 90 ~ 100% SMYSs carry out the water test, pipe girth increases about 0.08%, thus reaching stress in release mother metal and weld seam, prevention SSCC occurs, and after guaranteeing steel pipe hydraulic pressure, size, shape and performance meet the demands.
Beneficial effect of the present invention is: X65MS/X70MS steel grade spiral seam submerged arc welded pipe of the present invention, there is excellent resistance to H2S corrodibility, NACE TM0177 standard is adopted to carry out SSCC test in solution A, apply more than 90%s and specify yield strength stress level, sample tensile surface is intact, there is not any cracking, be applicable to high-pressure high-flow oil gathering and transportation pipelines or the use of conveying acid oil gas medium.
Embodiment:
Below the present invention is described in further detail:
The spiral submerged welded pipe of the anti-SSCC stress corrosion of embodiment 1: Φ 508 × 9.5mmX65MS grade of steel and manufacture thereof
1) raw material
Employing wall thickness is the X65MS steel plate of 9.5mm, and its chemical composition analysis is as following table (wt%):
Table 1X65MS chemical composition analysis (wt%)
C Mn Si P S Al Mo B Nb+V+Ti Cu+Ni+Cr
0.05 1.20 0.21 0.009 0.001 0.03 0.006 0 0.07 0.10
2) upper groove angle 60 ° behind milling limit, the width of root face 7 ~ 7.5mm;
3) according to roll bending yield strength level in kind, adopt forming by external control mode, precision measurement controls position and the angle of each format roll, adjustment 1# roller inclination angle is 19 ° and 3# roller inclination angle is 28 °, Reasonable adjustment 2# roller draught 1mm ~ 3mm, have good circularity and low unrelieved stress after guaranteeing steel pipe forming, measuring spring-go amount is-50mm.
4) weldering in: adopt anti-corrosion welding wire, solder flux; Number one welding wire adopts DC reverse connection, electric current 900A, voltage 30V; No. second welding wire adopts and exchanges, electric current 400A, voltage 34V; Welding speed is 1.90m/min.
5) outside weld: adopt anti-corrosion welding wire, solder flux; The technique of outside weld is: number one welding wire adopts DC reverse connection, electric current 1000A, voltage 32V; Welding speed is 1.90m/min.
6) water test: carry out 90% SMYS hydrostatic test to the steel pipe after expanding, test pressure is 15Mpa, dwell time 15S, pipe girth increases by 0.08%;
10) pipe end slope-mouth process: pipe end is processed, upper groove angle is 10 °, and lower groove angle is 30 °, and root face is 1.0+0.5mm;
11) ultrasonic testing: 100% ultrasound examination is carried out in butt welded seam and heat affected zone, for detecting defect that is expanding, hydraulic pressure generation;
12) X-ray examination: steel pipe inner and outer welding is carried out to industrial television inspection and the pipe end film making of 100%, for detecting defect that is expanding, hydraulic pressure generation;
13) appearance and dimension check: as requested steel pipe apparent size is measured;
Steel pipe physics and chemistry and corrosion resisting property as follows:
1) chemical composition analysis
Table 2X65MS weld seam main chemical compositions analyzes (wt%)
C Mn Si P S Al Mo B Nb+V+Ti Cu+Ni+Cr
0.045 1.31 0.23 0.011 0.002 0.022 0.006 0.04 0.09 0.12
2) transverse tensile property
Table 3X65MS Φ 508 × 9.5mm cross tensile test result
3) Charpy impact toughness, DWTT and pliability test result
Table 4X65MS Φ 508 × 9.5mm impact, DWTT and pliability test result
4) welding joint Vickers' hardness
Table 5X65MS Φ 508 × 9.5mm mother metal, Seam and heat effected zone Vickers' hardness (HV10)
5) corrosion resisting property test
Table 6X65MS Φ 508 × 9.5mm acid-proof pipe HIC sensitive parameter test result
Table 7X65MS Φ 508 × 9.5mm sample SSCC four-point bending test result
Embodiment 2:X70MS Φ 711 × 10mm hydrogen sulfide corrosion-resistant spiral submerged arc welded pipe manufacturer
1) raw material
Employing wall thickness is the X70MS steel plate of 10mm, and its chemical composition analysis is as following table (wt%):
Table 8X70MS chemical composition analysis (wt%)
C Mn Si P S Al Mo B Nb+V+Ti Cu+Ni+Cr
0.05 1.17 0.21 0.007 0.0007 0.027 0.006 0.0004 0.12 0.50
2) milling limit: upper groove angle 110 ° behind milling limit, width of root face 8.5mm;
3) shaping; According to roll bending yield strength level in kind, adopt forming by external control mode, precision measurement controls position and the angle of each format roll, adjustment 1# roller inclination angle is 18 ° and 3# roller inclination angle is 26 °, Reasonable adjustment 2# roller draught 1mm ~ 2mm, have good circularity and low unrelieved stress after guaranteeing steel pipe forming, measuring spring-go amount is 8mm.
4) weldering in: adopt anti-corrosion welding wire, solder flux; Number one welding wire adopts DC reverse connection, electric current 980A, voltage 31V; Welding speed is 1.90m/min.
5) outside weld: adopt anti-corrosion welding wire, solder flux; The technique of outside weld is: number one welding wire adopts DC reverse connection, electric current 1150A, voltage 33V; No. second welding wire adopts and exchanges, electric current 400A, voltage 34V; Welding speed is 1.90m/min.
6) water test: carry out 90% SMYS hydrostatic test to the steel pipe after expanding, test pressure is 13Mpa, dwell time 15S, pipe girth increases by 0.11%;
10) pipe end slope-mouth process: pipe end is processed, upper groove angle is 10 °, and lower groove angle is 30 °, and root face is 1.0 ± 0.5mm;
11) ultrasonic testing: 100% ultrasound examination is carried out in butt welded seam and heat affected zone, for detecting defect that is expanding, hydraulic pressure generation;
12) X-ray examination: steel pipe inner and outer welding is carried out to industrial television inspection and the pipe end film making of 100%, for detecting defect that is expanding, hydraulic pressure generation;
13) appearance and dimension check: as requested steel pipe apparent size is measured;
[018] steel pipe physics and chemistry and corrosion resisting property as follows:
1) chemical composition analysis
Table 9X70MS weld seam main chemical compositions analyzes (wt%)
C Mn Si P S Al Mo B Nb+V+Ti Cu+Ni+Cr
0.048 1.21 0.24 0.013 0.002 0.021 0.007 0.04 0.10 0.38
2) transverse tensile property
Table 10X70MS Φ 711 × 10mm cross tensile test result
3) Charpy impact toughness, DWTT and pliability test result
Table 11X70MS Φ 711 × 10mm impact, DWTT and pliability test result
4) welding joint Vickers' hardness
Table 12X70MS Φ 711 × 10mm mother metal, Seam and heat effected zone Vickers' hardness (HV10)
5) corrosion resisting property test
Table 13X70MS Φ 711 × 10mm acid-proof pipe HIC sensitive parameter test result
Table 14X70MS Φ 711 × 10mm sample SSCC four-point bending test result
As can be seen here, X65MS/X70MS grade of steel spiral welded tube material object salient features detected result and apply 90% σ sthe anti-SSCC stress corrosion of above regulation yield strength and the main performance requirements that do not ftracture contrast, the X65MS/X70MS acid resistance spiral welded tube utilizing technology of the present invention to manufacture, far exceedes 72% σ of hydrogen sulfide corrosion-resistant standard-required sthe technical requirements of regulation yield strength anti-SSCC stress corrosion spiral submerged welded pipe.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used 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 the method and technology contents that can utilize above-mentioned announcement are made a little change or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, still belong in the scope of technical solution of the present invention.

Claims (2)

1. the manufacture method of the X65MS/X70MS spiral submerged welded pipe that an anti-SSCC stress corrosion is excellent, it is characterized in that, comprising: uncoiling, leveling, milling limit, pre-bending, shaping, interior weldering, outside weld, Length-fixing cutting, pipe end are expanding, ultrasound investigation, X-ray examination, hydraulic pressure, pipe end chamfered edge and finished product inspection; The chemical composition of described welded tube is C :≤0.05wt%, Si:0.10 ~ 0.30wt%, Mn :≤1.20wt%, P :≤0.008wt%, S :≤0.001wt%, Cu :≤0.25wt%, Ni :≤0.25wt%, Cr :≤0.1wt%, Nb :≤0.10wt%, V :≤0.05wt%, Ti :≤0.06wt%, Mo :≤0.30wt%, Al :≤0.035wt%, B≤0.0002wt%, all the other are iron and inevitable impurity; Adopt anti-corrosion welding wire and solder flux welding, resistance to H 2the welding wire for submerged-arc welding of S corroded pipeline steel welding, its chemical component weight per-cent is: C≤0.06; Mn≤1.0; Si≤0.20; P≤0.010; S≤0.003; Cr≤0.30; Mo≤0.25; Al≤0.010; B≤0.008; All the other are Fe; Solder flux adopts high alkalinity, hydrogen sulfide corrosion-resistant solder flux, and its chemical component weight per-cent is CaF 2: 14 ~ 18%, CaO+MgO:26 ~ 30%, Al 2o 3+ MnO :≤25%, SiO 2:≤20%, S :≤0.008%, P :≤0.015%.
2. manufacture method as claimed in claim 1, it is characterized in that: adopt X65MS/X70MS grade of steel coiled sheet, adopt shaping, the anti-corrosion welding wire of low-stress and solder flux welding, hot input line energy hole in welded tube making processes, obtain the X65MS/X70MS steel grade spiral seam submerged arc welded pipe that high strength, high tenacity, anti-SSCC stress corrosion are excellent.
CN201310470450.2A 2013-10-07 2013-10-07 The X65MS/X70MS spiral submerged welded pipe that a kind of anti-SSCC stress corrosion is excellent and manufacture method thereof Active CN103540834B (en)

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CN104928602A (en) * 2015-06-25 2015-09-23 江苏省沙钢钢铁研究院有限公司 Pipeline steel, wide and thick plate, resistant to H2S corrosion, and production method thereof
CN105840919A (en) * 2015-09-08 2016-08-10 宝鸡石油钢管有限责任公司 Continuous pipe resistant to H2S corrosion and manufacturing method thereof
CN106906348B (en) * 2017-03-31 2018-12-07 中国石油天然气集团公司 A kind of manufacturing method for the X80MS-HFW welded tube that anti-SSCC stress corrosion is excellent
CN107142427B (en) * 2017-04-25 2019-01-04 中国石油天然气集团公司 A kind of spiral forming X80 steel-grade marine riser supervisor and its manufacturing method
CN111716077A (en) * 2019-03-20 2020-09-29 天津市同鑫泰钢管制造有限公司 Anti-cracking spiral steel pipe for long-distance oil and gas transmission and manufacturing process thereof
CN111286672A (en) * 2020-03-25 2020-06-16 江苏省沙钢钢铁研究院有限公司 Needle-shaped ferrite type X60-grade HIC-resistant pipeline steel and rolling method thereof

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CN102330034A (en) * 2011-09-30 2012-01-25 中国石油集团渤海石油装备制造有限公司 X65MS steel-grade spiral welded tube for acidic corrosion environment and manufacturing method thereof

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Effective date of registration: 20170524

Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No.

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Patentee before: Baoji Petroleum Steel Pipe Co., Ltd.