CN101444877B - Welding fluid for hidden arc welding of X80-grade steel oil and gas transmission pipe, and its production method - Google Patents
Welding fluid for hidden arc welding of X80-grade steel oil and gas transmission pipe, and its production method Download PDFInfo
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- CN101444877B CN101444877B CN2008100462325A CN200810046232A CN101444877B CN 101444877 B CN101444877 B CN 101444877B CN 2008100462325 A CN2008100462325 A CN 2008100462325A CN 200810046232 A CN200810046232 A CN 200810046232A CN 101444877 B CN101444877 B CN 101444877B
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Abstract
The invention belongs to a welding fluid for hidden arc welding of X80-grade steel oil and gas transmission pipe, and a production method thereof, the welding fluid comprises the following main ingredients according to the weight percentage: 14 to 17 percent of SiO2, 20 to 25 percent of MgO, 24 to 26 percent of Al2O3, 27 to 33 percent of CaF2, 3 to 6 percent of CaO, 1 to 3 percent of MnO, 2 to 5 percent of Na2O, 1.0 to 2.0 percent of TiO2, and a bond. The main ingredients are uniformly mixed according to the proportion and then the bond is added for pelleting; then the main ingredients are baked at low temperature, sintered at high temperature and then screened. Each ingredient in the welding fluid is reasonably matched and plays the excellent role of improving the mechanical performances of a welding part and a welding line, and is matched with a corresponding welding stick; the welding line thereof has the excellent performances of high intensity, high toughness, better corrosion resistance and lower rigidity approximating to the body of an X80-grade steel tube, and can carry out single and multi-wire welding as well as inside and outside high speed welding; multi-wire large-line energy welding can achieve 100m/h; and the air hole of the welding line, entrapped slag, cracks and appearance edges and undercuts can completely meet the standard requirements of API SPEC 5L and the hidden arc welding tube of the west-east national gas transmission project.
Description
Technical field
The invention belongs in the Metal Material Welding production process and the supporting solder flux of using of welding wire, particularly a kind of employing submerged-arc welding is produced X80 grade steel oil, letter shoot with solder flux and production method thereof.Adopt that this solder flux and corresponding welding wire are supporting can to carry out monofilament weldering, multifibres weldering and inside and outside High Speed Welding to the X80 grade steel, can satisfy being welded into pipeline (body) back weld seam and having the high strength close, high tenacity, corrosion resistance and lower premium properties such as hardness preferably again with pipeline body.
Background technology
It is the optimal means of transportation of long-distance transportation petroleum gas that pipeline is carried, and has economy, safe, efficient, energy-conservation, uninterrupted, and to distinguishing features such as the environmental disruption degree are little.Thereby the development of pipe transportation technology is paid much attention in countries in the world, and many countries spare no expense a large amount of financial resources and material resources are greatly developed pipeline industry.Pipeline transportation has become the fifth-largest transport service after highway, railway, water route and air transportation.
The development trend of pipeline construction is to long distance, high pressure, heavy caliber development; In addition, owing to often reach thousands of kilometers from the oil gas place of production to area of consumption, geological conditions complexity, climate variability on the way also propose more and more higher requirement to intensity, the toughness of pipe line steel.Along with the development of modern science and technology, the pipe line steel rank develops into X70, X80 by X56, X60, X65.At present, external pipeline construction generally adopts X70 grade of steel pipe line steel, and the construction of part long distance line begins to adopt the X80 pipe line steel, but whole world cumulative length only is 1750km.And the about 4800km of domestic transfering natural gas from the west to the east two wires natural gas line main line total length, X80 level Φ 1219 * 18.4mm spiral submerged welded pipe that this project main line is required and X80 level Φ 1219 * 22,26.4,33mm straight-line joint submerged arc welding tube produce required solder flux, as adopting X70 grade steel used for submerged arc welding solder flux, the performance of weld seam but is difficult to mate better with the performance of X80 tubing after being welded into pipeline.The maximum of X70 level pipe line steel composition is: C 0.080%, and Mn 1.65%, and Si 0.35%, S 0.005%, and P 0.020%, and Mo 0.30%, Cr 0.25%, and Nb 0.06%, and V 0.06%, all the other trace element and iron contents 97.225%, X70 grade steel performance is: yield strength 485-620Mpa, minimum tensile strength 570Mpa, maximum yield tensile ratio 0.90,22% ,-10 ℃ of ballistic works of minimum elongation rate (J) mean value minimum 180, single minimum of a value 135, strength of welded joint minimum of a value 570Mpa; And the maximum of X80 grade steel composition is: C 0.080%, and Mn 1.85%, and Si 0.42%, S 0.005%, and P 0.020%, and Mo 0.35%, Cr 0.45%, and Nb 0.11%, and V 0.04%, all the other trace element and iron contents 97.675%, X80 level pipe line steel performance is: yield strength 555-690Mpa, tensile strength 625-825Mpa, maximum yield tensile ratio 0.93,21% ,-10 ℃ of ballistic works of minimum elongation rate (J) mean value minimum 180, single minimum of a value 140, the minimum 625Mpa of strength of welded joint.
The actual data that record from above parameter and production learn that X80 grade steel performance is much better than the X70 grade steel, and are therefore higher to the requirement of the every performance indications of its weld seam, and existing solder flux can not satisfy the demand that X80 grade steel welded tube is produced.
Summary of the invention
The objective of the invention is a kind of X80 grade steel oil of research and design, letter shoot used for submerged arc welding solder flux and production method, so that it is supporting with corresponding welding wire, reaching the performance that is welded into weld seam behind the pipeline and the performance of X80 tubing more desirably mates, make weld seam have the high strength close, high tenacity, corrosion resistance and lower premium properties such as hardness preferably, and can carry out purposes such as monofilament weldering, multifibres weldering and inside and outside High Speed Welding with pipeline body.
Solution of the present invention is to prepare its solder flux according to the X80 grade steel and the wire composition that adopts, and each composition weight percent content is in the solder flux master composition of the present invention: SiO
214-17%, MgO 20-25%, Al
2O
324-26%, CaF
227-33%, CaO 3-6%, MnO 1-3%, Na
2O 2-5%, TiO
21.0-2.0%; Each composition (being powder) is mixed in proportion the binding agent granulation that adds material total amount 20-25% afterwards, again, through 100-200 ℃ of low-temperature bake, 700-740 ℃ high temperature sintering, screening, promptly make solder flux goods of the present invention again.
Used binding agent is sodium silicate or KP1 or potassium-sodium water glass.In the solder flux of the present invention:
CaF
2Being a kind of polygene mineral matter, belonging to alkaline fluoride, is that a kind of slag former, diluent also can play dehydrogenation effect, CaF in submerged arc welding flux
2Ionization goes out F under the welding arc effect
-, can reduce the dividing potential drop of hydrogen in the arc atmosphere, have and carbonate facics with effect.CaF
2Resolution reduce the content of oxygen in the deposited metal, help improving the low-temperature impact toughness of weld metal, CaF
2Fusing point is lower, can effectively reduce cinder high-temperature viscosity, improves slag fluidity, and improves electric conductivity, improves appearance of weld, and to improving welding procedure, improving the deposited metal mechanical performance has very big effect, reasonably CaF
2Content can play the effect of stable arc, if CaF
2Too high then arc stability variation, the slag hardening exchanges the solderability variation.Evidence CaF
2Better effects is arranged when 27-33%.
MgO is a kind of strong alkaline substance, also is a kind of good slag making materials, and the control of its butt welded seam shape is extremely important.For basic slag system, MgO can improve weld metal impact flexibility, reduces diffusible hydrogen.But the MgO fusing point is higher, increases viscosity coefficient of dross, improves the slag setting temperature, suppresses the flowability of slag, can make the appearance of weld variation when addition surpasses 30%, the welding bead center projections, and the slag difficulty is taken off in the slag hardening.So when adding, be controlled at 20-25%.
CaO is basic anhydride, plays slag making and improve the flux basicity effect in solder flux, and it can effectively improve solder flux Chinese People's Anti-Japanese Military and Political College current capacity, improves weld properties.But the al value of CaO and metal al value are very approaching, and it forms the dentation coupling with the top layer metal under high-temperature liquid state, prolong the thick metal coexistence time of slag and liquid, influence the appearance of weld and the removability of slag greatly.But CaO is easy and SiO
2Form CaO (SiO
2) multicomponent complex of n, reduce free CaO concentration, improve slag al value, thereby improve the removability of slag effectively.Be controlled at 3-6% during adding.
Al
2O
3Be amphoteric oxide, Al
2O
3Having the capillary effect of the slag of increase, is the adjustment agent of viscosity coefficient of dross, and thinking by lots of expriments contrasting increases a certain amount of Al
2O
3Can reduce load mould and tendency thereof, but too high Al
2O
3Content can make the weld seam radian sharper and unsmooth, easily produces pore and pit, skull hardening, Al
2O
3Content is crossed to hang down and is made face of weld uneven again, and influence is shaped, so amount is controlled at 24-26%.
SiO
2Be a kind of acidic materials, reduce flux basicity, in the solder flux with CaF
2Reasonably combined, can influence the anti-pore ability of solder flux, generally adopt high SiO
2With low CaF
2Proportioning, otherwise, low SiO
2Adopt high CaF
2, can make solder flux have good anti-pore performance, SiO like this
2Participate in slag making, adjust freezing point, surface tension and the cinder high-temperature viscosity of slag, the control that butt welded seam is shaped is extremely important.In this invention, in conjunction with the characteristics of X80 steel, in order to obtain good technology and mechanical performance, we adopt a spot of SiO
2Content is because too high SiO
2Content can cause the welding wire scaling loss excessive, crosses and reduces flux basicity greatly, and making weld seam return Si increases, and low-temperature impact toughness descends, and for this reason, determines SiO
2Content is at 14-17%.
MnO in welding process with SiO
2Be combined into compound silicate; form good welding slag, the protection deposited metal makes deposited metal not be subjected to the influence of N and O in the air; and the manganese element that is reduced is a main alloying component in the weld seam; can improve weld strength and impact flexibility, simultaneously, manganese that is reduced and the S chemical combination in the weld seam; form MnS and played the effect of taking off S; reduce weld seam and produce hot cracking tendency, for this reason, determine that MnO content is at 1-3%.
Na
2O is low degree of ionization oxide, can improve arc stability, and addition is controlled at 2-5% in solder flux.
TiO
2Be acidic oxide, can improve the physical property of slag, long slag is become short slag, make slag fast, make appearance of weld good, so amount is controlled at 1-2% with variation of temperature.
In addition, for the requirements such as the removability of slag, deoxidation, appearance of weld and favorable mechanical performance of satisfying weld seam, we have selected Si, Mn combined deoxidation and have oozed the deoxidier of [Mn], and the adding of manganese can improve intensity and toughness, also are a kind of good desulfurizing agents.Each composition rationally mates in the solder flux, and the mechanical performance of weld structure and weld seam has been played good effect.
Thereby, after the present invention is welded into pipeline with welding wire is supporting accordingly, make weld seam have the high strength close with pipeline body, high tenacity, corrosion resistance and lower premium properties such as hardness preferably with the X80 level, and can carry out monofilament weldering, multifibres weldering and inside and outside High Speed Welding, multifibres large-line energy high-speed welding can reach 100m/h, and obvious reduction of weld seam internal porosity, slag inclusion, crackle and defectives such as outward appearance edge and undercut also can be satisfied API SPEC5L and transfering natural gas from the west to the east two wires natural gas pipeline projects characteristics such as submerged-arc welded (SAW) pipe technical standard requirement fully.
The specific embodiment
Embodiment 1: will: SiO
214kg, MgO20kg, Al
2O
324kg, CaF
233kg, CaO3.0kg, MnO3.0kg, Na
2O2.0kg, TiO
21.0kg the technical pure powder place in the blender, mix after, add 22kg sodium silicate mixing granulation, again through 150 ℃ of bakings, 720 ℃ of high temperature sinterings,, sieve, promptly get flux basicity and be 2.25 solder flux.
This solder flux and chemical composition (by weight percentage) are: C0.085%, Mn1.63%, Si0.32%, S0.002%, P0.008%, Mo0.32%, Cu0.12%, Ti0.11%, Cr0.025%, Ni0.022%, F
e97.354%, surplus is that the welding wire of impurity cooperates; Adopting actual measurement chemical composition (by weight percentage) is C0.034%, Mn1.63%, Si0.24%, S0.002%, P0.01%, Cr0.24%, Mo0.001%, Cu0.14%, Ti0.014%, Nb0.10%, Ni0.11%, N0.004%, V0.004%, F
e97.465%, surplus is the X80 grade steel plate of impurity, and the body of Φ 1219 * 22mm is implemented the submerged arc welding of four inside and outside high speed vertical masonry joints.Welding point Charpy-type test (10 ℃) result is: body 325-415J, and weld seam 130-160J, heat affected area 205-230J, strength of welded joint are 710Mpa, weld seam, mother metal, heat affected area microhardness (HV
10) testing result is respectively 222-242,210-220, (standard is≤275HV 208-220
10).
Embodiment 2: with technical pure powder: SiO
215kg, MgO20kg, Al
2O
326kg, CaF
227kg, CaO6.0kg, MnO2.0kg, Na
2O2.0kg, TiO
22.0kg after placing in the blender, mixing, add 24kg KP1 mixing granulation, below with embodiment 1 with.Flux basicity is 1.93, and adopting the actual measurement chemical composition (by weight percentage) of X80 grade steel plate is C0.047%, Mn1.75%, Si0.20%, S0.002%, P0.006%, Cr0.28%, Mo0.001%, Cu0.16%, Ti0.014%, Nb0.10%, Ni0.10%, N0.004%, V0.004%, F
e97.330%, surplus is an impurity.Body to Φ 1219 * 26.4mm is implemented the submerged arc welding of four inside and outside high speed vertical masonry joints.Welding point Charpy-type test (10 ℃) result is: body 405-445J, and weld seam 200-235J, heat affected area 215-245J, strength of welded joint are 695Mpa, weld seam, mother metal, heat affected area microhardness (HV
10) testing result is respectively 219-243,210-234, (standard is≤275HV 208-225
10).
Embodiment 3: with technical pure powder: SiO
217kg, MgO22kg, Al
2O
325kg, CaF
228kg, CaO4.0kg, MnO1.0kg, Na
2O2.0kg, TiO
21.0kg after placing in the blender, mixing, add 23kg potassium-sodium water glass mixing granulation, below with embodiment 1 with.Flux basicity is 1.88, and adopting the actual measurement chemical composition (by weight percentage) of X80 grade steel plate is C0.04%, Mn1.72%, Si0.20%, S0.003%, P0.006%, Cr0.29%, Mo0.001%, Cu0.17%, Ti0.013%, Nb0.10%, Ni0.12%, N0.004%, V0.004%, F
e97.32%, surplus is an impurity.Body to Φ 1219 * 33mm is implemented the submerged arc welding of four inside and outside high speed vertical masonry joints.Welding point Charpy-type test (10 ℃) result is: body 410-425J, and weld seam 205-240J, heat affected area 230-250J, strength of welded joint are 730Mpa; Weld seam, mother metal, heat affected area microhardness (HV
10) testing result is respectively 219-245,208-228, (standard is≤275HV 210-236
10).
Claims (3)
1. an X80 grade steel oil, letter shoot used for submerged arc welding solder flux comprise main composition and binding agent, it is characterized in that each composition weight percent content is respectively in the main composition: SiO
214-17%, MgO 20-25%, Al
2O
324-26%, CaF
227-33%, CaO 3-6%, MnO 1-3%, Na
2O 2-5%, TiO
21.0-2.0% and the binding agent that accounts for main composition total amount 20-25%.
2. by the described X80 grade steel oil of claim 1, letter shoot used for submerged arc welding solder flux, it is characterized in that binding agent is sodium silicate or KP1 or potassium-sodium water glass.
3. by the production method of the described X80 grade steel oil of claim 1, letter shoot used for submerged arc welding solder flux, its method is: weight percent content is respectively: SiO
214-17%, MgO 20-25%, Al
2O
324-26%, CaF
227-33%, CaO 3-6%, MnO 1-3%, Na
2O 2-5%, TiO
2The principal component of 1.0-2.0% mixes in proportion the back, adds the binding agent granulation of becoming owner of composition total amount 20-25% again, through 100-200 ℃ of low-temperature bake, 700-740 ℃ high temperature sintering, screening, promptly makes solder flux goods of the present invention again.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100462325A CN101444877B (en) | 2008-10-08 | 2008-10-08 | Welding fluid for hidden arc welding of X80-grade steel oil and gas transmission pipe, and its production method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100462325A CN101444877B (en) | 2008-10-08 | 2008-10-08 | Welding fluid for hidden arc welding of X80-grade steel oil and gas transmission pipe, and its production method |
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| CN101444877A CN101444877A (en) | 2009-06-03 |
| CN101444877B true CN101444877B (en) | 2011-04-20 |
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Cited By (1)
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| CN102560552A (en) * | 2012-01-04 | 2012-07-11 | 饶云福 | Fusing agent for electrolytic aluminium anodic steel claws repairing |
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| CN107234365A (en) * | 2017-06-16 | 2017-10-10 | 上海大西洋焊接材料有限责任公司 | It is a kind of to be used for the welding material used for submerged arc welding of extra large work rack steel Q690 welding |
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