CN105234589B - A kind of Q500qE steel sintered flux used for submerged arc welding and preparation method thereof - Google Patents
A kind of Q500qE steel sintered flux used for submerged arc welding and preparation method thereof Download PDFInfo
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- CN105234589B CN105234589B CN201410669256.1A CN201410669256A CN105234589B CN 105234589 B CN105234589 B CN 105234589B CN 201410669256 A CN201410669256 A CN 201410669256A CN 105234589 B CN105234589 B CN 105234589B
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Abstract
The invention discloses a kind of Q500qE steel sintered flux used for submerged arc welding, the weight content of its main chemical compositions is：CaF236%~37.5%, A12O327.5%~29%, MgO 13%~15%, SiO214%~18%, CaO 1%~3%, Na2O/K2O 1%~2%, SeO20.5%~1.0% and FeSi75 A 1.0~1.3%；Preparation method is as follows：Raw material are weighed, stirring is done；The wet stirring of the glass that adds water；Granulation；Drying；Sieving, screens out the material of standard particle size；Sintering, cooling of coming out of the stove.Beneficial effects of the present invention are as follows：The sintered flux that the present invention is produced is the high toughness sintering solder that can adapt to Q500qE high-strength bridge steel submerged-arc weldings, while ensureing that weld metal has high intensity, excellent low temperature impact toughness, with excellent welding technological properties.
Description
Technical field
The present invention relates to bridge steel submerged arc welding technique field, and in particular to a kind of Q500qE steel sintered flux used for submerged arc welding and
Its preparation method.
Background technology
Sintered flux is a kind of high-quality, efficient, energy-saving and environmental protection type solder flux.The solder flux welding when it is smokeless, tasteless, without arc,
Without splashing.It manufactures process non-environmental-pollution, and energy consumption is low, and raw material meet national industry development policies using abundant.Burn
The bulk density for tying solder flux is small, and skull is relatively thin, and solder flux consumption is few, and welding cost is relatively low.The basicity value adjustment model of sintered flux
Enclose big, go for the welding of the poor material of solderability, weld seam ultralow-hydrogen low, high-strength and high ductility, the physics and chemistry of high cleanliness can be met
Performance requirement, is widely used in the welding of the high-alloy steel structure such as high-strength steel, stainless steel.
The development starting of Bridges in Our Country steel is more early, but slower development, develop 60~eighties of 20th century 16Mnq,
15MnVq, 15MnVNq etc., wherein 16Mnq is widely used, but impact flexibility is relatively low.The eighties, Jiujiang Bridge was employed
15MnVNq, but as a result of the V of high intensity, cause steel plate low-temperature impact toughness and welding performance poor.The nineties develops
14MnNbq (Q370q) railroad bridge steel, it has excellent low-temperature impact toughness, can meet wanting for general bridge construction
Ask.
At present, it is that four-track line six-lane highway builds bridge, main boat jointly that the Shanghai that China is building, which leads to the railway Yangtze Bridge,
Bridge is using the towers five of main span 1092m two across Cable-stayed Bridge Scheme, it is desirable to build crucial using the Q500qE bridge steel plates of higher intensity
Placement members.But existing welding material can not all meet the welding requirements of this high-intensity high-tenacity.Therefore develop a kind of suitable
Turn into important topic with the sintered flux of Q500qE bridge steel welding.
High alkalinity slag system sintered flux is readily available high tenacity weld seam, but for obtain high-intensity high-tenacity weld metal and
Good welds processing performance still has the big thick steel that very big technical difficulty, particularly throat thickness are more than 32mm, even 60mm
During plate, due to multi-layer multi-pass welding, the welding bead welded afterwards plays thermal processes act to preceding road weld seam, seam organization is changed,
Weld metal low-temperature impact is easily caused to absorb work(decline and fluctuate widely.Therefore, it can not be expired using original welding material
The welding requirements of sufficient Q500qE bridge steels high-strength and high-ductility.
The content of the invention
The technical problems to be solved by the invention be to provide it is a kind of can be while meeting the high intensity and high-ductility of weld metal
Property desired Q500qE steel sintered flux used for submerged arc welding and preparation method thereof.
In order to solve the above technical problems, the technical solution used in the present invention is：
A kind of Q500qE steel sintered flux used for submerged arc welding, the weight content of its main chemical compositions is：CaF236%~
37.5%th, Al2O327.5%~29%, MgO13%~15%, SiO214%~18%, CaO1%~3%, Na2O/K2O1%~
2%th, SeO20.5%~1.0% and FeSi75-A1.0~1.3%.
Preferably, the weight content of the main chemical compositions of the FeSi75-A is：Si72%~80%, C≤
0.1%th, Mn≤0.5%, Cr≤0.5%, S≤0.02%, P≤0.035%, surplus is iron.
A kind of preparation method of Q500qE steel sintered flux used for submerged arc welding, its method and step is as follows：
(1) raw material are weighed according to chemical component weight proportioning, the raw material weighed up is put into dry agitator and done
Stirring；
(2) the dry raw material stirred are put into wet agitator, then add a certain amount of waterglass, carry out wet stir
Mix；
(3) the wet material feeding comminutor stirred is granulated；
(4) by the granular material produced after heated-air drying, dried in feeding drying oven；
(5) granular material after drying is sieved, screens out the material of standard particle size；
(6) the standard particle size material screened out is sent into sintering furnace and be sintered, after sintering a period of time, come out of the stove cold
But；
(7) material after cooling of coming out of the stove is tested successively, sieved, packed, be put in storage, complete the preparation of sintered flux
Journey.
Preferably, the waterglass weight added in the step (2) is the 20% of raw material gross weight.
Preferably, the temperature in the step (4) in drying oven is 180 DEG C~230 DEG C.
Preferably, the temperature in the step (6) in sintering furnace is 800 DEG C~850 DEG C.
Preferably, the sintering time in the step (6) is 1 hour.
The basicity of Q500qE steel sintered flux used for submerged arc welding of the present invention is 1.68~1.80, can be reduced in welding process
Soldering wire alloy melting loss of elements, it is ensured that the intensity of weld metal, so as to improve weld metal low-temperature impact toughness.
The relatively small basic anhydride of decomposition pressure are such as Al2O3, MgO, CaO, Na2O, K2O etc. in increase sintered flux
Content, because basic anhydride stability is more much larger than FeO, oxidisability is not shown typically, thus in weld seam oxygen content also compared with
It is low.Decomposition pressure relatively large acidic oxide such as SiO2, TiO2 etc. content are reduced simultaneously, are designed to " anaerobic " or hypoxemia weldering
Oxygen content is in 162ppm~200ppm scopes in agent, the oxidation of reduction flux component Resistance of Weld Metal, control weld metal.
Ensure the degree of purity of weld metal, because manganese ore S, P content are high, present invention, avoiding directly obtained using manganese ore
MnO；S, P impurity content in appropriate CaO, control raw material are added, further increase weld seam takes off S, P effect.
Viscosity, surface tension and fusing point by adjusting solder flux etc., so as to improve the processability of weld seam and taking off for slag
Slag performance, improves welding technological properties, it is ensured that face of weld quality.
CaF2 in solder flux raw material is indispensable slag forming constituents, and it, which has, improves flux basicity, dilution slag, drop
The effect of eutectic slag melting point, while the oxygen content in deposited metal can be significantly reduced.When CaF2 contents in solder flux are less than 36%,
Not enough due to forming welding slag amount, the fusing point of slag is too high, the poor fluidity of slag, and the face shaping of welding bead deteriorates, simultaneously
The effect of oxygen content in weld metal cannot be reduced；On the other hand, when CaF2 contents are more than 37.5% in solder flux, electric arc is unstable
It is fixed, current interruption phenomenon is easily produced, the mobility of slag is big, easily causes weld metal shaping irregular.Therefore, CaF2 in solder flux
Content control is optimum efficiency in the range of 36%~37.5%.CaF2 is added in forms such as fluorite or ice crystals.
MgO in solder flux raw material is indispensable slag forming constituents, and it, which has, improves flux basicity, significantly reduces deposition
The effect of Oxygen in Metals content.MgO fusing point is up to 2700 DEG C, gives solder flux very big heat-resisting quantity, is large-line energy solder flux
Ensure the important component of appearance of weld.During compared with Large Heat Input Welding, weld shape is stable.Content of MgO in solder flux is less than 13%
When, due to being formed, welding slag amount is not enough, and the face shaping of welding bead deteriorates；When content of MgO is more than 15% in solder flux, the table of slag
Face tension force increase, the viscosity of slag is improved, and the slag extrusion molten metal of welding bead root, welding bead is serpentine-like.Therefore, in solder flux
Content of MgO control is optimum efficiency in the range of 13%~15%.MgO raw material is added in reheating magnesia form.
CaO in solder flux raw material be improve weld metal toughness alkaline slag forming constituents, its have improve flux basicity,
Significantly reduce the effect of oxygen content in deposited metal.When CaO content is less than 3% in solder flux, basic clinker amount is not enough, outside welding bead
See shape to deteriorate, while the effect of oxygen content in deposited metal cannot be reduced；On the other hand, CaO content is more than 3% in solder flux
When, density and the surface tension increase of slag, slag fluidity are poor, and weld bead shape is bad, and the removability of slag can decline.Therefore, solder flux
Middle CaO content control is optimum efficiency in the range of 1%~3%.CaO raw material uses marble, wollastonite etc..
The Na of a small amount of (adding up to 1%~2%) is selected in solder flux raw material2O/K2O, Na2O or K2O, which has, stablizes electric arc
Effect.Na in solder flux2O or K2When adding up to less than 1% of O, electric arc is unstable, and welding bead is rough and uneven in surface；Na in solder flux2O or
K2When adding up to more than 2% of O, the resistance to moisture absorption of solder flux declines, and easily produces pockmark and impression.Therefore, Na2O or K2The total of O contains
It 1%~2% is optimum efficiency that amount, which is,.Na2O or K2O main source is sodium silicate, the potassium sodium water of potassium feldspar and adhesive
Glass.
Al in solder flux raw material2O3It is to improve the neccessary composition of dry slag.Al2O3Decomposition pressure it is smaller than FeO, belong to relative
Stable oxide, the oxygen content of deposited metal is not improved.Al2O3It is the high-temperature refractory that fusing point is 2050 DEG C, is big line energy
Measure the important component for ensureing appearance of weld in solder flux.Al in solder flux2O3When content is less than 27.5%, during Large Heat Input Welding, postwelding
Welding bead dry slag, welding bead shaping is bad；Al in solder flux2O3When content is more than 29%, weld seam is narrow, convex weld seam, with mother metal fusion not
It is good, produce slag inclusion.Therefore, the Al in solder flux2O3Content control is optimum efficiency in the range of 27.5%~29%.Al2O3Mainly
Added in forms such as aluminum oxide, bauxite, flint clays.
SiO in solder flux raw material2It is the neccessary composition for obtaining good process performance.But SiO2It is that there is reduction slag alkali
Degree, the composition for improving the effect of deposited metal oxygen content.SiO in solder flux2When content is less than 14%, welding bead is molded bad, Welder
Skill performance is undesirable；SiO in solder flux2When content is more than 18%, the basicity of solder flux is reduced, the oxygen content in deposited metal is improved,
Reduce the toughness of deposited metal.Therefore, the SiO in solder flux2Content control is optimum efficiency in the range of 14%~18%.SiO2
Brought into the addition of the forms such as wollastonite, flint clay and binding agent.
SeO in solder flux raw material2It is surface active element, changes the surface nature of liquid metal, make hydrogen be difficult to enter
Liquid metal, so as to reduce the diffusible hydrogen content of deposited metal.SeO2Addition be advisable 0.5%~1.0%, be less than
When 0.5%, DeGrain during more than 1.0%, causes into appearance of weld bad.
Using having the beneficial effect that produced by above-mentioned technical proposal：
The sintered flux that the present invention is produced is can adapt to Q500qE high-strength bridge steel submerged-arc weldings high-toughness sintered
Solder flux, while ensureing that weld metal has high intensity, excellent low temperature impact toughness, with excellent welding technological properties.
The sintered flux produced is invented in large span high-strength bridge steel slab submerged arc butt welding, do not preheated before weldering,
Postwelding is without heat treatment, while meeting high intensity and the high tenacity requirement of weld metal.
Utilize the weld metal low-temperature impact toughness of sintered flux of the present invention, Charpy impact energy Akv (- 40
℃)：193J~213J, the dispersion very little of impact absorbing energy.The sintered flux of the present invention in welding process, slag it is molten
Point, viscosity coefficient of dross are moderate, and when molten bath solidifies, face of weld does not produce gas impression, with good appearance of weld.Slag table
Face tension force is relatively low, and postwelding takes off slag easily, and weld edge transition is steady, and surface is smooth, and weld appearance forming quality is good, with good
Good welding technological properties.The sintered flux of the present invention can also be matched with a variety of welding wires, solderable a variety of low-alloy steel and bridge
Steel.
Embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of protection of the invention.
Embodiment 1
A kind of Q500qE steel sintered flux used for submerged arc welding, the weight content of its main chemical compositions is：CaF237.2%th,
Al2O328%th, MgO14%, SiO216%th, CaO1%, Na2O/K2O2%, SeO20.5% and FeSi75-A1.3%.
The preparation method of above-mentioned Q500qE steel sintered flux used for submerged arc welding, it is comprised the following steps that：
(1) raw material are weighed according to chemical component weight proportioning, the raw material weighed up is put into dry agitator and done
Stirring；
(2) the dry raw material stirred are put into wet agitator, then add and account for the 20% of raw material gross weight
Waterglass, carries out wet stirring；
(3) the wet material feeding comminutor stirred is granulated；
(4) by the granular material produced after heated-air drying, feeding temperature is progress in 180 DEG C~230 DEG C of drying oven
Drying；
(5) granular material after drying is sieved, screens out the material of standard particle size；
(6) the standard particle size material screened out is sent into temperature to be sintered in 800 DEG C~850 DEG C of sintering furnace, burnt
After knot 1 hour, cooling of coming out of the stove；
(7) material after cooling of coming out of the stove is tested successively, sieved, packed, be put in storage, complete the preparation of sintered flux
Journey.
The basicity of the above-mentioned sintered flux produced is 1.80, and weld metal oxygen content is 162ppm.
Embodiment 2
A kind of Q500qE steel sintered flux used for submerged arc welding, the weight content of its main chemical compositions is：CaF236%th,
Al2O329%th, MgO13%, SiO216.3%th, CaO3%, Na2O/K2O1%, SeO20.7% and FeSi75-A1.0%.
The preparation method of above-mentioned Q500qE steel sintered flux used for submerged arc welding, it is comprised the following steps that：
(1) raw material are weighed according to chemical component weight proportioning, the raw material weighed up is put into dry agitator and done
Stirring；
(2) the dry raw material stirred are put into wet agitator, then add and account for the 20% of raw material gross weight
Waterglass, carries out wet stirring；
(3) the wet material feeding comminutor stirred is granulated；
(4) by the granular material produced after heated-air drying, feeding temperature is progress in 180 DEG C~230 DEG C of drying oven
Drying；
(5) granular material after drying is sieved, screens out the material of standard particle size；
(6) the standard particle size material screened out is sent into temperature to be sintered in 800 DEG C~850 DEG C of sintering furnace, burnt
After knot 1 hour, cooling of coming out of the stove；
(7) material after cooling of coming out of the stove is tested successively, sieved, packed, be put in storage, complete the preparation of sintered flux
Journey.
The basicity of the above-mentioned sintered flux produced is 1.70, and weld metal oxygen content is 167ppm.
Embodiment 3
A kind of Q500qE steel sintered flux used for submerged arc welding, the weight content of its main chemical compositions is：CaF236.8%th,
Al2O327.5%th, MgO14%, SiO217%th, CaO1%, Na2O/K2O1.5%, SeO21.0% and FeSi75-A1.2%.
The preparation method of above-mentioned Q500qE steel sintered flux used for submerged arc welding, it is comprised the following steps that：
(1) raw material are weighed according to chemical component weight proportioning, the raw material weighed up is put into dry agitator and done
Stirring；
(2) the dry raw material stirred are put into wet agitator, then add and account for the 20% of raw material gross weight
Waterglass, carries out wet stirring；
(3) the wet material feeding comminutor stirred is granulated；
(4) by the granular material produced after heated-air drying, feeding temperature is progress in 180 DEG C~230 DEG C of drying oven
Drying；
(5) granular material after drying is sieved, screens out the material of standard particle size；
(6) the standard particle size material screened out is sent into temperature to be sintered in 800 DEG C~850 DEG C of sintering furnace, burnt
After knot 1 hour, cooling of coming out of the stove；
(7) material after cooling of coming out of the stove is tested successively, sieved, packed, be put in storage, complete the preparation of sintered flux
Journey.
The basicity of the above-mentioned sintered flux produced is 1.68, and weld metal oxygen content is 200ppm.
Drawn through experiment, when sintered flux chemical composition content is not in institute's restriction range of the present invention, flux basicity will
Less than 1.68, weld metal oxygen content will be above 200ppm, not meet optimal performance requirement.
In summary, the sintered flux that the present invention is produced is the height that can adapt to Q500qE high-strength bridge steel submerged-arc weldings
Tenacity agglomeration solder flux, while ensureing that weld metal has high intensity, excellent low temperature impact toughness, with excellent Welder
Skill performance.
The sintered flux produced is invented in large span high-strength bridge steel slab submerged arc butt welding, do not preheated before weldering,
Postwelding is without heat treatment, while meeting high intensity and the high tenacity requirement of weld metal.
Utilize the weld metal low-temperature impact toughness of sintered flux of the present invention, Charpy impact energy Akv (- 40
℃)：193J~213J, the dispersion very little of impact absorbing energy.The sintered flux of the present invention in welding process, slag it is molten
Point, viscosity coefficient of dross are moderate, and when molten bath solidifies, face of weld does not produce gas impression, with good appearance of weld.Slag table
Face tension force is relatively low, and postwelding takes off slag easily, and weld edge transition is steady, and surface is smooth, and weld appearance forming quality is good, with good
Good welding technological properties.The sintered flux of the present invention can also be matched with a variety of welding wires, solderable a variety of low-alloy steel and bridge
Steel.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (2)
1. a kind of Q500qE steel sintered flux used for submerged arc welding, it is characterised in that the weight content of its main chemical compositions is：
CaF236%~37.5%, Al2O327.5%~29%, MgO13%~15%, SiO214%~18%, CaO1%~3%,
Na2O/K2O1%~2%, SeO20.5%~1.0% and FeSi75-A1.0~1.3%；
The weight content of the main chemical compositions of the FeSi75-A is：Si72%~80%, C≤0.1%, Mn≤0.5%, Cr
≤ 0.5%, S≤0.02%, P≤0.035%, surplus is iron.
2. a kind of preparation method of Q500qE steel sintered flux used for submerged arc welding as claimed in claim 1, it is characterised in that its side
Method step is as follows：
(1) raw material are weighed according to chemical component weight proportioning, the raw material weighed up is put into dry stirring is carried out in dry agitator；
(2) the dry raw material stirred are put into wet agitator, then add a certain amount of waterglass, carry out wet stirring；
(3) the wet material feeding comminutor stirred is granulated；
(4) by the granular material produced after heated-air drying, dried in feeding drying oven；
(5) granular material after drying is sieved, screens out the material of standard particle size；
(6) the standard particle size material screened out is sent into sintering furnace and be sintered, after sintering a period of time, cooling of coming out of the stove；
(7) material after cooling of coming out of the stove is tested successively, sieved, packed, be put in storage, complete the preparation process of sintered flux；
The waterglass weight added in the step (2) is the 20% of raw material gross weight；
Temperature in the step (4) in drying oven is 180 DEG C~230 DEG C；
Temperature in the step (6) in sintering furnace is 800 DEG C~850 DEG C；
Sintering time in the step (6) is 1 hour.
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| CN109202330A (en) * | 2018-11-09 | 2019-01-15 | 湖北大西洋焊接材料有限公司 | One kind exempting from weather-proof steel bridge sintered flux of coating and preparation method thereof |
| CN112496596B (en) * | 2021-02-07 | 2021-06-18 | 四川西冶新材料股份有限公司 | Sintered flux for hydrogen-resistant steel, method for producing same, and deposited metal |
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|---|---|---|---|---|
| JPS5440249A (en) * | 1977-09-06 | 1979-03-29 | Sumitomo Metal Ind Ltd | Preparation of fused flux for low hydrogen submerged arc welding |
| CN87102907A (en) * | 1986-04-21 | 1987-10-28 | 联合有限公司 | Add the wettability of tensio-active agent improvement eutectic solder |
| CN1788920A (en) * | 2005-12-20 | 2006-06-21 | 宝鸡石油钢管有限责任公司 | High welding rate, high ductility fluorine alkaline type sintered flux |
| CN101444877A (en) * | 2008-10-08 | 2009-06-03 | 四川大西洋焊接材料股份有限公司 | Welding fluid for hidden arc welding of X80-grade steel oil and gas transmission pipe |
| CN102363252A (en) * | 2011-10-09 | 2012-02-29 | 北京金威焊材有限公司 | Low-alkalinity and high-toughness sintered flux |
| CN102601544A (en) * | 2012-03-21 | 2012-07-25 | 宝鸡市宇生焊接材料有限公司 | High-alkalinity high-tenacity low-hydrogen agglomerated flux and preparation method thereof |
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2014
- 2014-11-21 CN CN201410669256.1A patent/CN105234589B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5440249A (en) * | 1977-09-06 | 1979-03-29 | Sumitomo Metal Ind Ltd | Preparation of fused flux for low hydrogen submerged arc welding |
| CN87102907A (en) * | 1986-04-21 | 1987-10-28 | 联合有限公司 | Add the wettability of tensio-active agent improvement eutectic solder |
| CN1788920A (en) * | 2005-12-20 | 2006-06-21 | 宝鸡石油钢管有限责任公司 | High welding rate, high ductility fluorine alkaline type sintered flux |
| CN101444877A (en) * | 2008-10-08 | 2009-06-03 | 四川大西洋焊接材料股份有限公司 | Welding fluid for hidden arc welding of X80-grade steel oil and gas transmission pipe |
| CN102363252A (en) * | 2011-10-09 | 2012-02-29 | 北京金威焊材有限公司 | Low-alkalinity and high-toughness sintered flux |
| CN102601544A (en) * | 2012-03-21 | 2012-07-25 | 宝鸡市宇生焊接材料有限公司 | High-alkalinity high-tenacity low-hydrogen agglomerated flux and preparation method thereof |
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| CN105234589A (en) | 2016-01-13 |
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