CN103084752B - A kind of X100 pipe line steel high-strength and high ductility welding wire for submerged-arc welding - Google Patents
A kind of X100 pipe line steel high-strength and high ductility welding wire for submerged-arc welding Download PDFInfo
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Abstract
A kind of X100 pipe line steel high-strength and high ductility welding wire for submerged-arc welding, its composition by weight percent is: C0.01% ~ 0.06%, Si0.30% ~ 0.50%, Mn1.20% ~ 1.80%, Cr0.20% ~ 0.50%, Ni1.50% ~ 3.00%, P < 0.010%, S < 0.005%, Ti0.01% ~ 0.10%, Mo0.30 ~ 0.60%, B0.001% ~ 0.008%, Al0.01% ~ 0.03%, Nb0 ~ 0.06%, all the other are Fe and inevitable impurity, and, the value of C+Mn/10 controls between 0.18 ~ 0.20%, the value of Al+Ti+10B controls between 0.100 ~ 0.115%.X100 pipe line steel high-strength and high ductility welding wire for submerged-arc welding of the present invention and pipe line steel X100 match, the weld seam adapting to the requirement of X100 Pipeline Welded Joints can be obtained when this welding wire mates with basic flux, its tensile strength is greater than 760MPa, and weld metal-40 DEG C of ballistic works are greater than 150J.
Description
Technical field
The invention belongs to steel products wire rod class, in particular to a kind of X100 pipe line steel high-strength and high ductility welding wire for submerged-arc welding, can obtain the weld seam adapting to the requirement of X100 Pipeline Welded Joints when this welding wire mates with basic flux, its tensile strength is greater than 760MPa, and weld metal-40 DEG C of ballistic works are greater than 150J.
Background technology
Pipe line steel is for the manufacture of oil, natural-gas transfer pipeline welded tube, and the mode that natural-gas transfer pipeline adopts heavy caliber high pressure to carry usually, this mode of movement proposes requirement that is high-strength, high-ductility to sheet material.In recent years, high grade pipe line steel (as X80) starts to be applied on a large scale in pipeline engineering, and the second west to east gas pipeline project main line as China all adopts X80 pipe line steel to lay.More high-grade pipe line steel (X100) is also developed, and progressively will be applied in engineering and go.Because the pipeline steel strength of more than X100 is very high, and the low-temperature flexibility of pipeline Welded Pipe requires very high, therefore requires that the weld seam of welding wire for submerged-arc welding and the solder flux coupling welding adopted also has characteristic that is high-strength, high-ductility.
Domestic most popular welding wire for submerged-arc welding is H08MnMoTiB (patent No. CN1068528A), this welding wire mates with SJ101 solder flux can obtain good weld seam impact toughness and tensile strength, in capital, Shan line, two wires, capital, Shan, the national great gas transmission lines such as a line of transferring natural gas from the west to the east, obtain a large amount of application, and obtain good effect.But this welding wire coupling pipeline steel grade substantial scope is between X60 ~ X70, and when mating X80, weld strength is slightly inadequate.
The pipe line steel grade of steel X70 of existing state gut line welding wire for submerged-arc welding coupling and comprise Chinese patent CN1068528A, CN1273897, CN1077152, CN1273897A, CN1305879A below.Coupling X80 pipe line steel welding wire as Chinese patent CN1376553A, CN101104229.Chinese patent CN1376553A main chemical compositions is the elements such as Mn, Si, Mo, Ni, Ti, B, Cu, Zr, is improved intensity and the toughness of weld seam by multielement composite effect; Chinese patent CN101104229 main chemical compositions is the elements such as Mn, Si, Mo, Cr, Ti, B, and this patent carries high Mn content on patent CN1068528A basis, adds Cr to improve the intensity of weld seam to adapt to X80 simultaneously.
The weld strength obtained after Chinese patent CN1376553A welding wire mates with solder flux SJ102 is at about 650MPa.Chinese patent CN101104229 welding wire mates with BGSJ101-G solder flux and can obtain weld metal tensile strength and be greater than 700MPa; Weld metal-20 DEG C of ballistic works are greater than 150J.
Weld strength reaches the welding wire of X100 requirement as Chinese patent CN1919524, chemical composition is: C0.06 ~ 0.12, Si0.03 ~ 0.20, Mn1.50 ~ 2.00, Cr0.20 ~ 0.60, Ni1.40 ~ 2.60, Mo0.10 ~ 0.50, Cu0.10 ~ 0.60, Ti0.06 ~ 0.20, B0.002 ~ 0.010, surplus is Fe and inevitable impurity.This welding wire mates with alkalescent sintered flux, the tensile strength>=800MPa of weld seam ,-40 DEG C of impact flexibility A
kV>=47J.The intensity of this welding wire reaches the requirement that X100 is greater than 760MPa, but notched bar impact strength is on the low side, awaits further raising.
Summary of the invention
Object of the present invention provides a kind of X100 pipe line steel high-strength and high ductility welding wire for submerged-arc welding, the high-strength and high ductility welding wire for submerged-arc welding matched with pipe line steel X100, the weld seam adapting to the requirement of X100 Pipeline Welded Joints can be obtained when this welding wire mates with basic flux, its tensile strength is greater than 760MPa, and weld metal-40 DEG C of ballistic works are greater than 150J.
For achieving the above object, technical scheme of the present invention is:
A kind of X100 pipe line steel high-strength and high ductility welding wire for submerged-arc welding, its composition by weight percent is: C0.01% ~ 0.06%, Si0.30% ~ 0.50%, Mn1.20% ~ 1.80%, Cr0.20% ~ 0.50%, Ni1.50% ~ 3.00%, P < 0.010%, S < 0.005%, Ti0.01% ~ 0.10%, Mo0.30 ~ 0.60%, B0.001% ~ 0.008%, Al0.01% ~ 0.03%, Nb0 ~ 0.06%, all the other are Fe and inevitable impurity, and, the value of C+Mn/10 controls between 0.18 ~ 0.20%, the value of Al+Ti+10B controls between 0.100 ~ 0.115%.
Further, also comprise Nb0 ~ 0.06% in welding wire for submerged-arc welding composition of the present invention, weight percent meter is in component of weld wire design of the present invention:
Intensity and the toughness of C element content butt welded seam have larger impact.When C content is lower, weld strength is lower, and ratio of ferrite increases, and toughness is higher.When C content is higher, weld strength increases, and pearlite ratio increases, and welding seam toughness declines.C content is controlled 0.01 ~ 0.06%, be used for improving the toughness of weld seam.
Mn can play deoxidation, prevents the cementite field trash causing fire check to produce from being formed, impels ferrite crystal grain and carbide refinement, thus improve intensity and the toughness of weld seam.In the present invention, Mn content controls in higher level, is mainly used to improve weld strength, makes up the loss of strength that low C causes.Mn content is controlled 1.20 ~ 1.80%.
Adding appropriate Si, Al can deoxidation, stops O and B to combine, and the AlN of Al and N formation simultaneously can crystal grain thinning, the toughness of raising weld seam.Si content is controlled control 0.01 ~ 0.03% at 0.30 ~ 0.50%, Al content.
Mo is stronger solution strengthening element, can improve weld strength, and Mo element postpones austenitic transition temperature in addition, suppresses the formation of pro-eutectoid ferrite and ferrite side plate, promotes the formation of intragranular acicular ferrite, improves weld seam low-temperature flexibility.Mo content is controlled 0.30 ~ 0.60%.
The atomic radius of B is very little, can segregate to austenite crystal border in a large number, improves crystal boundary energy, suppresses the formation of grain boundary ferrite and ferrite side plate, improves welding seam toughness.B content is controlled 0.001 ~ 0.008%.
N in Ti and austenite reacts and generates TiN particle, and TiN has very low solubility, forms very thin dispersion in weld seam, effectively can stop grain growth, becomes the forming core core of acicular ferrite simultaneously, greatly improves the toughness of weld seam.Ti content is controlled 0.01 ~ 0.10%.
Add the effect that a small amount of Nb can play precipitation-hardening, improve the intensity of weld seam further.Nb content is controlled 0 ~ 0.06%.
Cr is conducive to improving acicular ferrite content in weld seam, reduces pro-eutectoid ferrite, and has the effect of fining ferrite grains, improves intensity and the toughness of weld seam.Cr content is controlled 0.20 ~ 0.50%.
Ni is solid-solution in ferritic alloying element, can improve intensity and the toughness of weld seam within the specific limits.The Ni main purpose adding certain content is the low-temperature flexibility improving weld seam, reduces brittle transition temperature.Ni content is controlled 1.50 ~ 3.00%.
S, P are the main harmful elements in weld seam, will reduce the low-temperature flexibility of weld metal, also can reduce the anti-H of weld seam simultaneously
2s stress corrosion performance, control a lower level, wherein S is less than 0.005%, P and is less than 0.01% as far as possible.
The requirement of the present invention's not only demand fulfillment high strength, but also need to obtain fabulous low-temperature flexibility requirement, therefore adopt ultralow C to improve the toughness of weld seam when designing, the value of C+Mn/10 is controlled between 0.18 ~ 0.20% simultaneously, in Ultra-low carbon situation, C, Mn combination in this proportioning interval can obtain good intensity and tough sexual balance.Add suitable Al, Ti and B, the value of Al+Ti+10B is made to control between 0.100 ~ 0.115%, the reaction by Ti, Al and O, N can be ensured within the scope of this, prevent the excessively oxidated and nitrogenize of B, B atom is utilized to improve the forming core energy of pro-eutectoid ferrite, prevent the formation of border ferrite and ferrite side plate, improve toughness.On this basis, utilize Ni premium properties under cryogenic, the Ni of 1.50 ~ 3.00% can reduce weld seam ductile-brittle transition temperature significantly, improves low-temperature flexibility and the stability of weld seam, even if make weld metal also have very high impact value at-40 DEG C.Ensure that weld strength reaches more than 760MPa additionally by the solid solution of Mo, Cr and Nb, precipitation, precipitation strength.Adopt low S, P to improve the anti-H of welding point simultaneously
2s stress corrosion performance.
Beneficial effect of the present invention
1. welding wire of the present invention mates with alkalescent sintered flux, and submerged arc welding inside and outside the multifibres being applicable to pipe line steel, do not need preheating before weldering, postwelding is without heat treatment, and can carry out the high speed submerged arc welding of welded tube manufacture, speed of welding can reach 1.0m/min ~ 2.0m/min.
2. welding wire of the present invention mates with alkalescent sintered flux, welds X100 pipe line steel, and gained weld metal has very high intensity and low-temperature impact toughness, and weld seam tensile strength is greater than 760Mpa, and weld seam impact toughness is greater than 150J (-40 DEG C).
Detailed description of the invention
Below in conjunction with embodiment, the present invention will be further described.
Table 1 is the chemical composition of the embodiment of the present invention, and surplus is Fe.
Annealing is drawn into the welding wire of diameter 4mm, mates, carry out two-sided single track submerged arc welding to X100 pipe line steel with alkalescent sintered flux SJ101G.
Property of welded joint is as shown in table 2.As can be seen from Table 2, embodiments of the invention not only weld seam tensile strength have all exceeded 760MPa, and the ballistic work-40 DEG C time has all exceeded 150J, far away higher than API standard-required, meets designing requirement.
Table 1 welding wire chemical composition unit: percentage by weight
| Embodiment | C | Si | Mn | P | S | Ti | Mo | Cr | Ni | B | Nb | Al |
| 1 | 0.034 | 0.40 | 1.54 | 0.006 | 0.0039 | 0.020 | 0.54 | 0.29 | 2.1 | 0.0077 | 0.058 | 0.013 |
| 2 | 0.028 | 0.37 | 1.70 | 0.007 | 0.0045 | 0.031 | 0.38 | 0.22 | 2.9 | 0.0060 | 0.029 | 0.014 |
| 3 | 0.037 | 0.38 | 1.50 | 0.007 | 0.0037 | 0.024 | 0.38 | 0.25 | 2.9 | 0.0063 | 0.019 | |
| 4 | 0.035 | 0.37 | 1.55 | 0.006 | 0.0010 | 0.029 | 0.50 | 0.35 | 1.9 | 0.0053 | 0.027 | |
| 5 | 0.047 | 0.35 | 1.40 | 0.006 | 0.0021 | 0.065 | 0.52 | 0.32 | 2.2 | 0.0030 | 0.015 | |
| 6 | 0.019 | 0.45 | 1.75 | 0.007 | 0.0026 | 0.046 | 0.42 | 0.38 | 2.0 | 0.0046 | 0.018 | |
| 7 | 0.057 | 0.31 | 1.35 | 0.006 | 0.0027 | 0.058 | 0.35 | 0.46 | 2.3 | 0.0018 | 0.025 |
Table 2 welding point stretches and impact property
Claims (2)
1. an X100 pipe line steel high-strength and high ductility welding wire for submerged-arc welding, its composition by weight percent is: C0.01% ~ 0.06%, Si0.30% ~ 0.50%, Mn1.20% ~ 1.80%, Cr0.20% ~ 0.50%, Ni1.50% ~ 3.00%, P < 0.010%, S < 0.005%, Ti0.01% ~ 0.10%, Mo0.30 ~ 0.60%, B0.001% ~ 0.008%, Al0.01% ~ 0.03%, all the other are Fe and inevitable impurity, and, the value of C+Mn/10 controls between 0.18 ~ 0.20%, the value of Al+Ti+10B controls between 0.100 ~ 0.115%, its weld seam tensile strength is greater than 760MPa, and weld metal-40 DEG C of ballistic works are greater than 150J.
2. X100 pipe line steel high-strength and high ductility welding wire for submerged-arc welding as claimed in claim 1, is characterized in that, also comprise Nb0 ~ 0.06%, weight percent meter.
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| CN103273213A (en) * | 2013-05-13 | 2013-09-04 | 天津大学 | High-strength high-toughness submerged arc welding wires |
| CN103862193B (en) * | 2014-02-21 | 2016-10-05 | 宝山钢铁股份有限公司 | A kind of high-strength and high ductility pipe line steel reality core gas protecting welding wire |
| CN103846571B (en) * | 2014-03-26 | 2016-03-16 | 锦州天鹅焊材股份有限公司 | A kind of high-performance X100 pipe line steel welding wire for hidden arc welding and application thereof |
| CN104942475B (en) * | 2015-07-10 | 2017-06-16 | 北京工业大学 | A kind of X90/X100 pipe line steels high intensity metallic core welding wire for submerged-arc welding and preparation method thereof |
| CN105234583A (en) * | 2015-10-26 | 2016-01-13 | 钢铁研究总院 | X80 submerged-arc welding wire applicable to welding of coal-to-gas pipes |
| CN109202329A (en) * | 2017-07-05 | 2019-01-15 | 昆山中冶宝钢焊接材料有限公司 | A kind of 690MPa grades of welding wire for submerged-arc welding of yield strength meeting -60 DEG C of requirements |
| CN110317994B (en) * | 2018-03-30 | 2021-12-17 | 宝山钢铁股份有限公司 | Ultrahigh-strength steel for high heat input welding and manufacturing method thereof |
| CN108747084A (en) * | 2018-08-14 | 2018-11-06 | 四川西冶新材料股份有限公司 | A kind of welding wire for submerged-arc welding and preparation method thereof |
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| JP2857318B2 (en) * | 1994-03-31 | 1999-02-17 | 株式会社神戸製鋼所 | Welding wire for high tensile steel |
| JP3894703B2 (en) * | 1999-04-15 | 2007-03-22 | Ｊｆｅスチール株式会社 | Gas shielded arc welding wire |
| JP4396303B2 (en) * | 2004-02-12 | 2010-01-13 | Ｊｆｅスチール株式会社 | High strength welded steel pipe with excellent low temperature toughness |
| CN100441364C (en) * | 2006-09-13 | 2008-12-10 | 武汉钢铁(集团)公司 | High ductility buried arc welding wire for low-alloy super-strength steel |
| CN100537118C (en) * | 2006-11-24 | 2009-09-09 | 首钢总公司 | Submerged arc welding wire for steel pipeline |
| JP5078918B2 (en) * | 2009-01-09 | 2012-11-21 | Ｊｆｅエンジニアリング株式会社 | Welding wire for high strength steel |
| CN102019516A (en) * | 2010-11-01 | 2011-04-20 | 西安理工大学 | Solder wire for submerged arc welding of X100 pipeline steel and preparation method thereof |
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