CN1132718C - High-performance welding wire for hidden arc welding of pipeline steel - Google Patents
High-performance welding wire for hidden arc welding of pipeline steel Download PDFInfo
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- CN1132718C CN1132718C CN 01106520 CN01106520A CN1132718C CN 1132718 C CN1132718 C CN 1132718C CN 01106520 CN01106520 CN 01106520 CN 01106520 A CN01106520 A CN 01106520A CN 1132718 C CN1132718 C CN 1132718C
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Abstract
The present invention relates to a high performance welding wire for hidden arc weld of pipeline steel. The present invention has chemical components (according to the weight percent) containing 0.05 to 0.12 of C, 0.005 to 0.100 of Si, 1.20 to 1.90 of Mn, 0.10 to 0.50 of Ni, 0.10 to 0.50 of Cr, 0.04 to 0.12 of Ti and 0.002 to 0.012 of B. The present invention is matched with an alkalinity sintered flux to weld the pipeline steel and is adaptable to high-speed hidden arc weld processes of double wires, multiple wires, front and back wires and inner and outer wires. The tensile strength of a welding seam is no less than 590MPa; impulsive work at-20 DEG C is no less than 150J; hardness is no more than 240Hv10; the content of S and P is low; purity is high. The present invention is particularly suitable for welding anticorrosive pipeline steel for delivering wet natural gas containing H2 S and is also suitable for the hidden arc weld of low-alloy steel with a corresponding intensity grade.
Description
Technical field
The present invention relates to a kind of high-performance welding wire for hidden arc welding of pipeline steel, a kind of coupling with alkalescent sintered flux of more specifically saying so, use, and is used to weld the welding wire of controlled rolling and controlled cooling microalloying pipe line steel, and the postwelding weld seam can satisfy carries the wet H that contains
2The requirement of S natural gas corrosion resistance.
Background technology
The development of petroleum industry has proposed new requirement for pipe line steel, welding material and solder technology.The general welding material of producing by GB that uses of state's gut line welding has also been developed microalloying pipeline welding wire recently.Be used for pipeline steel submerged arc welding wire both at home and abroad and have GB 2 090 615 A of 82 years Britain application " little molybdenum or do not have the welding material of molybdenum ", its alloy is C-Mn-Cr-(Mo)-Ti-B; 92 years General Institute of Iron and Steel, Ministry of＜atallurgical Industry etc. have applied for " low carbon micro alloyed submerged-arc welding wire ", the patent No. 92105621.4, and its alloy is C-Mn-Mo; These welding wire weak points are: be difficult to guarantee simultaneously high intensity and toughness; When the pipe line steel thickness of slab increases, need carry out the large-line energy multilayer welding, weld strength and toughness all have obvious decline.Wuhan Iron ﹠ Steel (Group) Corp. had developed " low-alloy high-strength and high-toughness submerged-arc welding electrode " in 97 years, the patent No. 97104393.0, this welding wire is compared with traditional welding wire, and performance is enhanced, but the welding of also only comparatively suitable 590MPa and following intensity rank steel.
Summary of the invention
The purpose of this invention is to provide a kind of high-performance welding wire for hidden arc welding of pipeline steel, can overcome the deficiency of above-mentioned welding wire, be suitable for the welding of 590MPa and above intensity rank pipe line steel, mate with alkalescent sintered flux, postwelding weld seam tensile strength 〉=590MPa,-20 ℃ of weld seam ballistic work 〉=150J, weld hardness≤240H
V10; Weld seam S, P content are low, and high purity can satisfy and carry the wet H that contains
2The requirement of S natural gas corrosion resistance.
The present invention in order to achieve the above object, designed a kind of high-performance welding wire for hidden arc welding of pipeline steel, the chemical composition that it is characterized in that welding wire percentage meter by weight contains: C 0.05～0.12, Si 0.005～0.100, Mn1.20～1.90, and Ni 0.10～0.50, Cr 0.10～0.50, Ti 0.04～0.12, and B 0.002～0.012, and surplus is Fe and inevitable S, P.
Component of weld wire design of the present invention is closely related with the alkalescent sintered flux of pipe line steel quality of parent material that is welded and coupling, and soldering wire alloy element properties of weld has very big influence.
For pipe line steel, along with petroleum resources turns to ocean, massif, desert, plateau and severe cold areas, the intensity and the toughness of pipeline steel improve constantly.The 590MPaX70 steel is the leading steel grade of pipe line steel, more the pipe line steel of high intensity levels Application and Development progressively.The performance of X70 steel is as shown in table 1.
Table 1 X70 steel mechanical property
| б s (MPa) | б b (MPa) | Charpy-type test (20 ℃) | |||
| Shear surface (SA, %) | Ballistic work (J) | ||||
| Single minimum | On average | Single minimum | On average | ||
| 530～630 | ≥590 | ≥80 | ≥90 | ≥90 | ≥120 |
Conveying contains especially anti-H 2 S stress corrosion performance of stress corrosion resistant that the natural gas line steel of corrosive medium has relatively high expectations.Influence the anti-H of pipe line steel welding point
2The principal element of S stress corrosion performance has: 1) by gas transmission body pressure and moisture degree; 2) hardness of welding point; 3) residual stress of welding point; 4) tissue of welding point; 5) welding wire contains the S amount.In order to satisfy these requirements, the pipe line steel welding point must have higher impact flexibility, lower hardness (≤240H
V10), seam organization should be not more than 0.005% based on the sulfur content in acicular ferrite, the weld seam.
C is controlled at 0.05%～0.12% in the welding wire of the present invention's design, and the obdurability of C constituent content butt welded seam and tissue thereof are formed bigger influence.When C content was low, weld strength was lower, and ratio of ferrite is higher in the weld metal.When C content was higher, welding seam toughness descended, and weld seam medium pearlite ratio increases.Therefore C too high levels or mistake are hanged down and all can be influenced acicular ferrite content in the weld seam.
Si is controlled at 0.005%～0.100% in the welding wire of the present invention, can make just that si content is controlled at below 0.3% in the weld seam.Because the base metals proportion is big in the pipe line steel weld seam, solder flux and mother metal si content are higher, and the si content in the welding wire should be controlled at reduced levels.
Mn is controlled at 1.20%～1.90% in the welding wire of the present invention, and Mn is the effective element of weld seam Strengthening and Toughening, helps deoxidation in weld seam, prevents to cause the formation of the iron sulfide of fire check.When Mn content in the weld seam 1.00%～1.60% the time, the weld seam obdurability reaches preferable coupling.
Ni is 0.10%～0.50% in the welding wire of the present invention, and the toughness that Ni helps improving weld metal is low-temperature impact toughness especially, reduces brittle transition temperature.When Ni content was too high, welding wire intensity and hardness were too high, and Ni content causes weld seam and mother metal composition difference big, at the wet H that contains
2Corrosion resistance reduces greatly in the S medium, and the welding wire cost increases.
Contain Cr 0.10%～0.50% in the welding wire of the present invention, contain certain Cr element in the weld seam and help improving acicular ferrite content in the weld seam, reduce pro-eutectoid ferrite, and the effect of refinement ferrite crystal grain is arranged, improve the weld seam obdurability.Performance maintained higher level after Cr also helped to keep weld seam heat treatment.
Adding Ti in the welding wire of the present invention can thinning weld metal structure.Ti and N have high affinity, and Ti and N are combined into the TiN particle, as nucleus, impel the formation of acicular ferrite in the weld seam.For the content that makes Ti in the weld metal 0.01%～0.04%, consider certain transfer coefficient, the Ti content in the welding wire can rise to 0.04%～0.12%.
Add 0.002%～0.012%B in the welding wire of the present invention, can make that B content is controlled at 0.001%～0.004% in the weld seam, the B of solid solution assembles reduction crystal boundary energy at austenite grain boundary, can control separating out of pro-eutectoid ferrite, B is deferrable austenite → ferritic phase transition temperature also, helps the formation of intragranular acicular ferrite.
S, P element are the main harmful elements in the weld seam, and they significantly reduce the weld metal low-temperature impact toughness.In order to guarantee that the pipe line steel weld seam has higher anti-H
2The S stress corrosion performance, S content should be lower than 0.005% in the weld seam.S is an inevitable element in the welding wire, and welding wire steel should reduce S content when smelting as far as possible.The CHF101 that the alkaline species solder flux of welding wire of the present invention and low S content such as the Atlantic Ocean, Zi Gong welding material Co., Ltd produce, CHF105 class solder flux coupling are used, the low S pipe line steel of welding, and the Welding Metallurgy course of reaction can further reduce the S content in the weld seam.
The pipe line steel welding point requires mechanical performance preferably, particularly higher low-temperature impact toughness, post weld heat treatment performance and anti-preferably H is arranged
2The S corrosive nature.This welding wire has taken into full account these requirements in the chemical composition design, therefore match alkalescent sintered flux as the optimum Match solder flux.C, Mn, Ni guarantee the enough intensity of weld seam in the welding wire, improve the toughness of weld seam; Proper C r butt welding is sewed with invigoration effect, and can increase the adaptability of weld seam to post weld heat treatment.Trace Ti, B help suppressing in the weld seam austenite crystal and grow up, and postpone austenite to ferritic transition temperature, impel the formation of weld metal intracrystalline acicular ferrite, the refinement subgrain.Low S, P content improve weld seam degree of purity and performance, guarantee the anti-preferably H of weld seam
2The S stress corrosion performance.
Welding wire of the present invention adopts electric furnace smelting, the gas content during smelting in the control welding wire.
The chemical composition that contains welding wire of the present invention also can be made into other form welding with filling metal, as welding rod, gas shield welding wire and the welding band utmost point.
High-performance welding wire for hidden arc welding of pipeline steel of the present invention has following advantage:
1, stable being easy to of this welding wire steel smelting process realized, better performances such as drawing of the rolling and welding wire of steel billet dialled, copper facing.
2, welding wire of the present invention is used for 590MPa and above intensity rank pipe line steel and the welding of other structural steel, the weld strength height, and impact flexibility is better than existing welding wire, has better anti-H
2Performances such as S stress corrosion; Weld strength and toughness can be mated with high performance base material fully.
3, adopt welding wire welding of the present invention can adapt to the process characteristic of pipe line steel mariages or multifibres and front and back and inside and outside silk high-speed welding.
The specific embodiment
Be described in further detail welding wire of the present invention with embodiment below:
Embodiment 1: with electric furnace smelting welding wire of the present invention, its chemical composition percentage is by weight counted C 0.053, and Si 0.054, and Mn 1.41, and Ni 0.36, and Cr 0.29, and Ti 0.086, and B 0.005, and P 0.013, and S 0.008, and surplus is Fe.The SJ101 solder flux coupling that welding wire and Jinzhou solder flux factory produce, the thick 590MPa pipe line steel of welding 10mm, the chemical composition of steel percentage meter by weight mainly contains C0.090, and Si 0.238, Mn 1.335,, Ni 0.012, and Ti 0.016, B 0.0047, and P 0.012, S0.007.Welding procedure is an I type groove, each weldering one of positive and negative, and reverse side is back chipping not.Welding condition is first 680A of welding current, second 800A, and first 32V of weldingvoltage, second 34V welds fast 1.1m/min.
Welding point is tested by the API5LS standard, and cold-bending property is qualified, weld seam ballistic work A
Kv(30 ℃)=161J.Welding point after heat treatment under the 580 ℃ * 1h condition, weld seam ballistic work A
Kv(30 ℃)=108J.Welding wire of the present invention has stronger adaptability to weld heat input, still can keep better strength and toughness after the welding point heat treatment.
Embodiment 2: with electric furnace smelting welding wire of the present invention, its chemical composition percentage is by weight counted C0.058, and Si 0.091, and Mn 1.76, and Ni 0.40, and Cr 0.416, and Ti 0.049, and B 0.0047, and P 0.006, and S 0.0045, and surplus is Fe.Welding wire and CHF101 or CHF105 solder flux coupling, the thick X70H pipeline of welding 10mm steel plate, welding procedure and test stone are as hereinbefore.The welding point cold-bending property is qualified, and stretching and Hardness Surveillance result are as shown in table 2.It is as shown in table 3 that weld seam impacts assay.
Table 2 X70 pipe line steel welding point stretches and tests
| Project | The joint cross directional stretch | Weld seam stretches | Hardness Hv10 | |
| б b MPa | б s MPa | б b MPa | ||
| Coupling CHF101 | 705 710 | 585 | 670 | 201 202 209 |
| Coupling CHF105 | 670 675 | 600 | 690 | 227 230 232 |
| Requirement | ≥590 | 485～650 | ≥590 | ≤240 |
Table 3 welding point impacts check
| Project | Temperature ℃ | Weld seam impacts check | |
| A kv，J | SA，％ | ||
| Coupling CHF101 | -20 | 171 216 216 201 | 100 100 100 100 |
| -30 | 192 187 157 179 | 100 97 95 97 | |
| -40 | 192 195 176 188 | 100 98 95 98 | |
| Coupling CHF105 | -20 | 208 213 197 206 | 100 97 96 98 |
| -30 | 189 187 181 186 | 100 97 94 97 | |
| Requirement | -20 | Single 〉=90, average 〉=120 | Single 〉=80, average 〉=90 |
Embodiment 3: with the GXHJ-1 solder flux that the welding wire of embodiment 2, Zhengzhou solder flux factory produce, adopt the inside and outside welder of mariages and the multifibres welded pipeline steel of planting, the X70 pipe line steel that the welding Wuhan Iron and Steel Plant produces, postwelding analyzing adapter б
bBe 640MPa, A
Kv(20 ℃)=240J.The X70 pipe line steel that Baosteel is produced carries out double wire hidden arc welding, postwelding analyzing adapter б
bBe 695MPa, A
Kv(20 ℃)=158J.Welding wire of the present invention is stronger to solder flux and welding procedure adaptability.The anti-H of welding point
2The S corrosive nature is shown in table 4 and table 5.
The anti-SSC performance of table 4 banjo fixing butt jointing
| Be subjected to the sample material | Check load (virtual stress) S (10 4psi) | The Sc value |
| Weldering meat | 14(v) 16(v) 18(v) 16(v) 18(v) | 16.8 |
| HAZ | 14(v) 16(v) 18(v) | Be not less than 18 |
The anti-HIC performance of table 5 banjo fixing butt jointing
| Project | CLR(％) | CTR(％) | CSR(％) |
| On average | 0 | 0 | 0 |
| On average | 0 | 0 | 0 |
| On average | 4.00 | 0.37 | 0.04 |
| Three mean values | 1.33 | 0.12 | 0.01 |
The Sc value of SSC check satisfies anti-SSC requirement all greater than 12.
CLR (crack length rate), CTR (crack thickness rate), CSR (the responsive rate of crackle) all are lower than at present the wet H that contains of conveying in the world
2The anti-HIC index that the S oil and gas pipes extensively adopts, i.e. CLR≤15%, CTR≤3%, CSR≤1.5%.
In sum, the present invention is the submerged-arc welding wire of a kind of high strength, high tenacity, high comprehensive performance, be particularly suitable for the submerged arc welding of the 590MPa and the above intensity rank high-performance pipe line steel of microalloying controlled rolling and controlled cooling, be applicable to the submerged arc welding of respective strengths grade high-strength degree low-alloy steel simultaneously.
Claims (1)
1, a kind of high-performance welding wire for hidden arc welding of pipeline steel, the chemical composition that it is characterized in that welding wire percentage meter by weight contains: C 0.05～0.12, Si 0.005～0.100, Mn 1.20～1.90, Ni 0.10～0.50, Cr0.10～0.50, and Ti 0.04～0.12, B 0.002～0.012, and surplus is Fe and inevitable S, P.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01106520 CN1132718C (en) | 2001-02-28 | 2001-02-28 | High-performance welding wire for hidden arc welding of pipeline steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01106520 CN1132718C (en) | 2001-02-28 | 2001-02-28 | High-performance welding wire for hidden arc welding of pipeline steel |
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| CN1305879A CN1305879A (en) | 2001-08-01 |
| CN1132718C true CN1132718C (en) | 2003-12-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354065C (en) * | 2005-06-28 | 2007-12-12 | 武汉钢铁(集团)公司 | Submerged-arc welding wire for high-strength pipeline steel |
| CN100420539C (en) * | 2006-11-02 | 2008-09-24 | 武汉铁锚焊接材料股份有限公司 | Self protection flux core welding wire of pipe line steel full position |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104999169B (en) * | 2015-07-31 | 2017-07-07 | 武汉钢铁(集团)公司 | A kind of Rel is the 500MPa grades of buried arc welding method of ultrafast cold steel |
| CN107009049B (en) * | 2017-05-24 | 2019-07-30 | 中国石油天然气集团公司 | One kind being suitable for L360/X52 or less low level pipe line steel submerged arc welding welding wire |
-
2001
- 2001-02-28 CN CN 01106520 patent/CN1132718C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354065C (en) * | 2005-06-28 | 2007-12-12 | 武汉钢铁(集团)公司 | Submerged-arc welding wire for high-strength pipeline steel |
| CN100420539C (en) * | 2006-11-02 | 2008-09-24 | 武汉铁锚焊接材料股份有限公司 | Self protection flux core welding wire of pipe line steel full position |
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