CN103252594A - Welding wire applicable to welding of X70MS/X65MS pipeline steel resisting hydrogen sulfide corrosion - Google Patents
Welding wire applicable to welding of X70MS/X65MS pipeline steel resisting hydrogen sulfide corrosion Download PDFInfo
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- CN103252594A CN103252594A CN2013101504928A CN201310150492A CN103252594A CN 103252594 A CN103252594 A CN 103252594A CN 2013101504928 A CN2013101504928 A CN 2013101504928A CN 201310150492 A CN201310150492 A CN 201310150492A CN 103252594 A CN103252594 A CN 103252594A
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Abstract
The invention discloses a submerged-arc welding wire applicable to welding of X70MS/X65MS pipeline steel resisting hydrogen sulfide corrosion. The submerged-arc welding wire applicable to the welding of the X70MS/X65MS pipeline steel resisting the hydrogen sulfide corrosion is characterized by comprising, by weight, no more than 0.06% of carbon, no more than 0.8% of manganese, no more than 0.20% of silicon, no more than 0.010% of phosphorus, no more than 0.005% of sulfur, no more than 0.30% of chromium, no more than 0.25% of molybdenum, no more than 0.010% of aluminum and no more than 0.008% of boron, and the balance is ferrum. According to the submerged-arc welding wire applicable to the welding of the X70MS/X65MS pipeline steel resisting the hydrogen sulfide corrosion, due to the fact that on the basis of ultra-low carbon, the content of the manganese is reduced, the addition amount of phosphorus and sulfur is strictly controlled, chromium, molybdenum, boron and copper, titanium and the like in base material are added reasonably, good mechanical property of a wielding joint is guaranteed, and the objective that the welding joint has certain corrosion resistance in an acid environment of hydrogen sulfide is achieved.
Description
Technical field:
Present invention is directed at and contain H
2The natural gas transmission pipeline development need of S corrosive medium, exploitation is applicable to X70MS/X65MS and the anti-H of following grade of steel
2S corroded pipeline steel welding wire.Adopt welding wire of the present invention, cooperate the welding of the anti-corrosion pipe line steel of corresponding solder flux and X70MS/X65MS after, can guarantee that weld seam is higher in impact flexibility, under the moderate situation of hot strength, have good anti-H
2The S corrosive nature.
Background technology:
Oil gas well majority contains H
2Corrosive mediums such as S, the H of some gas and oils
2S content is at 1.2～7.8g/m
3Several major oil and gas fields of China (as Xinjiang, Sichuan, long celebrating, Central Plains, North China, Tarim Basin oil gas field etc.) all contain H in various degree
2S as one of the main force source of the gas ground of " western gas two wires ", reached 1,000,000,000 side's production capacities, H as I rupture band in the tower of Xinjiang in 2010
2The minimum 12817mg/m of S weighting content
3, the highest 18943mg/m
3, average 13219mg/m
3In order to carry these sulfur-containing gas, need select anticorrosive tubing for use, or add corrosion inhibiter (comprising the current potential release method), or select the composite bimetal pipe material for use, or use frp pipe etc.Relatively, the antiseptic effect of anticorrosive high alloy tubing is best from the tubing aspect, but price is higher, and mainly depends on import, and delivery cycle does not guarantee; Nonmetallic materials such as frp pipe intensity are low, and anti-extrusion performance is poor, are subjected to exterior mechanical infringement easily and lose efficacy.For containing small amount of H
2S transportation pipe line adopts acid resistance low-alloy pipeline steel tube to occupy advantage with its low cost.At present, both at home and abroad developed the pipe line steel of acid resistance X60, X65, X70MS/X65MS grade of steel, but welding material still adopts common pipe line steel welding wire solder flux, these welding wires have mainly been considered the obdurability problem of weld seam, and do not consider etching problem.
Summary of the invention:
The present invention designs and a kind ofly can carry out the anti-H of X70MS/X65MS
2S corroded pipeline steel welding wire with corresponding solder flux coupling, is satisfying under certain processing performance situation, after carrying out anti-corrosion pipe line steel submerged arc welding, make weld seam under the prerequisite that satisfies the obdurability requirement, reach the anticorrosive requirement of NACE standard-required, hardness≤22HRC.Concrete scheme is:
Its composition percentage by weight of welding wire of the present invention is: C≤0.06; Mn≤0.8; Si≤0.20; P≤0.010; S≤0.005; Cr≤0.30; Mo≤0.25; Al≤0.010; B≤0.007; All the other are Fe.
Chemical composition of the present invention is from the C-Mn-Cr-Mo alloy system, and it is as follows to propose corrosion resistance component of weld wire mentality of designing:
(1) C is as the main intensified element in the seam organization, play an important role for the weld seam tensile property, but in corrosion-resisting steel, carbon content is too high, will cause that hardness raises, crack sensitivity increases, and when acquiring a certain degree, can change organizational composition, heterogeneous structure occur, produce intercrystalline corrosion, cause corrosion resistance to reduce greatly.Therefore, this welding wire adopts the Ultra-low carbon design, but considers the scaling loss of C in the welding process, so C is controlled 0.04～0.06;
(2) mechanical property of the content butt welded seam metal of Mn has very big influence.Along with the increase of Mn content, the yield strength of weld metal and hot strength are linear to be increased, and in addition, Mn can also significantly reduce brittle transition temperature, and improves the impact flexibility of weld seam.But be not that Mn content is more high more good, because along with the increase of Mn content, MnS is corresponding increasing also, produce banded segregation, will cause the H atom to be easy in this gathering, finally germinate crackle and expansion until fracture, the ability of anti-SSCC in the weld seam is reduced.Given this, the present invention adopts low manganese scheme, and Mn content is controlled 0.5～0.8;
(3) Si butt welded seam tissue and performance have material impact, main invigoration effect and the deoxidation of rising in weld metal.Silicon has slight invigoration effect to the low-intensity weld metal.Along with silicone content increases gradually, for impact flexibility and anti-H
2The S corrosion has significant improvement effect.But when Mn, Si existed simultaneously, along with the increase of Mn-Si content, the Si element was easy to the segregation edge, can encourage the formation of intercrystalline crack, and will cause weld seam and heat affected area hardness too high, influenced the anti-H of weld seam
2The S corrosive nature, so Si content is 0.15～0.20;
(5) Cr can alleviate weld metal at H
2Corrosion rate in the S environment, this welding wire have been added the corrosion resistance that a certain amount of Cr improves welding back weld seam, but the Cr too high levels can produce carbide, increase hardness, reduce corrosion resistance.Cr content is designed to 0.25～0.30;
(6) Mo is as a kind of ferritic stabilizer, in weld seam, can promote the AF forming core, and butt welded seam impact flexibility has good improvement effect, Mo butt welded seam intensity effect has very big again but then, along with the increase weld strength of content linearly rises, and too high and cause Sensitivity of Stress Corrosion to increase for fear of intensity, Mo content in the welding wire is limited in 0.10～0.25;
(8) P and S be as impurity element, directly for the anti-H of weld seam
2S corrosion has a strong impact on, and wherein, S can bring out spot corrosion and stress corrosion cracking with the sulphide inculsion thing that element such as Fe forms uninterrupted distribution; Phosphide exists, and impels liberation of hydrogen corrosion aggravation.So its content is controlled at P＜0.010%, S＜0.005%.
Adopt the design of above-mentioned component of weld wire, cooperate corresponding anti-corrosion solder flux to carry out the welding of X70MS/X65MS grade of steel pipe line steel after, guaranteed that weld seam had both had hot strength and impact flexibility preferably, have good anti-HIC and SSCC performance simultaneously again.
Produce in conjunction with pipeline steel pipe submerged-arc welding process, what the present invention was useful act as:
1, welding wire of the present invention and corresponding solder flux carry out after the inside and outside double-submerged arc of the anti-corrosion pipe line steel of X70MS/X65MS connects, weld strength R
m=520MPa～590MPa ,-10 ℃ of following impact flexibility A
Kv〉=140J, inner and outer welding hardness is less than 22HRC;
2, welding wire of the present invention and corresponding solder flux carry out carrying out weld seam HIC according to TM0284-2003 standard butt welded seam and detecting CSR≤2%, CLR≤15%, CTR≤5% after the inside and outside double-submerged arc of the anti-corrosion pipe line steel of X70MS/X65MS connects; Carry out SSCC according to the NACE-0177-96 standard and detect, adopt A solution (the saturated 5%NaCl+0.5% glacial acetic acid of hydrogen sulfide), sample does not have any cracking or crackle generation under 90% σ s stress;
3, this welding wire mates corresponding solder flux, deposited metal R
T0.5=420～500MPa, R
m=530～590MPa ,-20 ℃ of following impact flexibility A
Kv〉=50J, the inside and outside double-submerged arc of anti-corrosion pipe line steel that is adapted to intensity rank and is X70MS/X65MS connects, and has wideer welding condition accommodation;
Specific embodiment
Example 1: adopt vaccum sensitive stove, need with P, S, raw material that the C impurity content is low, the molten iron that S, the control of P content are carried out in strictness through smelting the molten steel that to meet the composition requirement, burns and casts continuous casting billet, is rolled into through the high speed twist-free mill
Wire rod.
Welding wire of the present invention and BG-SJ101G solder flux coupling are carried out the deposited metal welding, and according to " GB/T12470-2003 low alloy steel welding wire used for submerged arc welding and solder flux " standard-required, test plate (panel) adopts Q235, and thickness is 20mm, 30 ° of bevel angles, and root gap is 12mm.Welding conditions are electric current 475A～575A, voltage 27V～30V, speed of welding 25 ± 1.5m/h; Temperature is 150 ± 15 ℃ between the road, and the deposited metal yield strength is 495MPa, and tensile strength is 588MPa, and percentage elongation is that 22.5% ,-20 ℃ of impact absorbing energies are 72J;
The present invention and BG-SJ101G solder flux coupling, the anti-corrosion pipe line steel C0.04 of the welding thick X65MS of 9.5mm, Si0.22, Mn1.23, P0.011, S0.002, Cu0.17, Ni0.17, Cr0.21, Mo0.01, Ti0.02, V0.05, Al0.03, B0.0002, all the other are iron.Technology mode is joint form X type, 35 ° of internal groove angles, 50 ° of outer bevel angles, root face size 8-9mm.Welding conditions are: welding current 600～850A, and weldingvoltage 29.5～32V, speed of welding 1.62～1.98m/min, inside and outside double wire hidden arc welding connects, and welding back appearance of weld is good, and the welding toe transition is good.Welding back weld properties the results are shown in Table 1, and butt welded seam carries out HIC, the SSCC performance test results is seen mark table 2, table 3.
Table 1X65MS welding joint mechanical property detects
Table 2X65MS welding point HIC Performance Detection
(A solution loads 90% σ to table 3X65MS welding point SSCC Performance Detection
S)
Example 2: adopt the welding wire of above-mentioned explained hereafter, the quality percentage composition of this welding wire is: C0.054, Mn0.72, Si0.15, P0.007, S0.005, Cr0.28, Mo0.15; Al0.007, B0.008; All the other are Fe.
Welding wire of the present invention and BG-SJ101G solder flux coupling are carried out the deposited metal welding, and according to " GB/T12470-2003 low alloy steel welding wire used for submerged arc welding and solder flux " standard-required, test plate (panel) adopts Q235, and thickness is 20mm, 30 ° of bevel angles, and root gap is 12mm.Welding conditions are electric current 475A～575A, voltage 27V～30V, speed of welding 25 ± 1.5m/h; Temperature is 150 ± 15 ℃ between the road, and the deposited metal yield strength is 502MPa, and tensile strength is 595MPa, and percentage elongation is that 21.3% ,-20 ℃ of impact absorbing energies are 55J;
The present invention and BG-SJ101G solder flux coupling, the anti-corrosion pipe line steel C0.05 of the welding thick X70MS of 9.5mm, Si0.22, Mn1.21, P0.017, S0.002, Cu0.35, Ni0.007, Cr0.27, Mo0.006, Ti0.014, V0.052, Al0.027, Nb0.035, all the other are iron.Technology mode is joint form X type, 40 ° of internal groove angles, 55 ° of outer bevel angles, root face size 6-8mm.Welding conditions are: welding current 600～850A, and weldingvoltage 29.5～32V, speed of welding 1.62～1.98m/min, inside and outside double wire hidden arc welding connects, and welding back appearance of weld is good, and the welding toe transition is good.Welding back weld properties the results are shown in Table 4, and butt welded seam carries out HIC, the SSCC performance test results is seen mark table 5, table 6.
Table 4X70MS welding joint mechanical property detects
Table 5X70MS welding point HIC Performance Detection
(A solution loads 90% σ to table 6X70MS welding point SSCC Performance Detection
S)
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, any simple modification that foundation 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 (3)
1. anti-H who is applicable to the X70MS/X65MS grade of steel
2S corroded pipeline guiding principle welding wire is characterized in that this welding wire is made up of following weight percentage: C≤0.06; Mn≤0.8; Si≤0.20:P≤0.010; S≤0.005; Cr≤0.30; Mo≤0.25; Al≤0.010; B≤0.008; All the other are Fe.
2. welding wire as claimed in claim 1 is characterized in that, this welding wire is made up of following weight percentage: C0.04～0.06; Mn0.5～0.8; Si0.15～0.20; P≤0.010; S≤0.005; Cr0.25～0.30; Mo0.10～0.25; Al≤0.010; B≤0.007; All the other are Fe.
3. the manufacture method of welding wire as claimed in claim 1 or 2 is characterized in that, adopts vaccum sensitive stove, and with P, S, raw material that the C impurity content is low, smelting goes out to meet the molten steel of composition requirement, burns and casts continuous casting billet, does not roll power and is not rolled into through having at a high speed to turn round
Wire rod;
Wire rod becomes through the rust cleaning of peeling off, cathodic pickling, boronation processing, wire drawing, degreasing, electrolytic alkaline cleaning, cathodic pickling, electroless copper silks
Or
The finished product welding wire.
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| CN2013101504928A CN103252594A (en) | 2013-04-26 | 2013-04-26 | Welding wire applicable to welding of X70MS/X65MS pipeline steel resisting hydrogen sulfide corrosion |
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| CN2013101504928A CN103252594A (en) | 2013-04-26 | 2013-04-26 | Welding wire applicable to welding of X70MS/X65MS pipeline steel resisting hydrogen sulfide corrosion |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104400254A (en) * | 2014-11-25 | 2015-03-11 | 宝鸡石油钢管有限责任公司 | Welding wire applicable to submerged-arc welding of H2S corrosion resistant ultralow manganese pipeline steel |
| CN104588913A (en) * | 2014-11-21 | 2015-05-06 | 宝鸡石油钢管有限责任公司 | Welding wire for submerged-arc welding suitable for X70 offshore oil and gas conveying steel |
| CN104942469A (en) * | 2015-07-01 | 2015-09-30 | 宝鸡石油钢管有限责任公司 | Welding wire suitable for welding low-strength H2S-corrosion-resistant pipeline steel in submerged arc mode |
| CN111922550A (en) * | 2020-08-20 | 2020-11-13 | 四川西冶新材料股份有限公司 | Gas shielded welding wire, preparation method comprising gas shielded welding wire and welding method comprising gas shielded welding wire |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104588913A (en) * | 2014-11-21 | 2015-05-06 | 宝鸡石油钢管有限责任公司 | Welding wire for submerged-arc welding suitable for X70 offshore oil and gas conveying steel |
| CN104400254A (en) * | 2014-11-25 | 2015-03-11 | 宝鸡石油钢管有限责任公司 | Welding wire applicable to submerged-arc welding of H2S corrosion resistant ultralow manganese pipeline steel |
| CN104942469A (en) * | 2015-07-01 | 2015-09-30 | 宝鸡石油钢管有限责任公司 | Welding wire suitable for welding low-strength H2S-corrosion-resistant pipeline steel in submerged arc mode |
| CN111922550A (en) * | 2020-08-20 | 2020-11-13 | 四川西冶新材料股份有限公司 | Gas shielded welding wire, preparation method comprising gas shielded welding wire and welding method comprising gas shielded welding wire |
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Application publication date: 20130821 |