CN105234589A - Sintering flux for Q500qE steel submerged-arc welding and preparation method of sintering flux - Google Patents
Sintering flux for Q500qE steel submerged-arc welding and preparation method of sintering flux Download PDFInfo
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- CN105234589A CN105234589A CN201410669256.1A CN201410669256A CN105234589A CN 105234589 A CN105234589 A CN 105234589A CN 201410669256 A CN201410669256 A CN 201410669256A CN 105234589 A CN105234589 A CN 105234589A
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Abstract
The invention discloses a sintering flux for Q500qE steel submerged-arc welding. The sintering flux comprises, by weight, 236%-37.5% of CaF, 27.5%-29% of A12O3, 13%-15% of MgO, 14%-18% of SiO2, 1%-3% of CaO, 1%-2% of Na2O/K2O, 0. 5%-1.0% of SeO2 and 1.0%-1.3% of FeSi75-A. A preparation method comprises the following steps that the raw materials are weighed and taken, and dry stirring is conducted; sodium silicate is added and wet stirring is conducted; pelleting is conducted; drying is conducted; screening is conducted and materials with standard gradation are screened out; and sintering is conducted, and cooling is conducted out of a furnace. The sintering flux and the preparation method thereof have the beneficial effects that the sintering flux prepared through the preparation method is a high-toughness sintering flux which can adapt to Q500qE high-strength bridge steel submerged-arc welding; it is ensured that weld metal has high strength and good low temperature impact toughness, and meanwhile, the sintering flux has good welding technological properties.
Description
Technical field
The present invention relates to bridge steel submerged arc welding technique field, be specifically related to a kind of Q500qE steel sintered flux used for submerged arc welding and preparation method thereof.
Background technology
Sintered flux is a kind of high-quality, efficient, energy-saving and environmental protection type solder flux.This solder flux weld time smokeless, tasteless, without arc, without splashing.It manufactures process non-environmental-pollution, and energy consumption is low, and raw material utilize fully, meet national industry development policies.The bulk density of sintered flux is little, and skull is thinner, and solder flux consumption is few, and welding cost is lower.The basicity value adjusting range of sintered flux is large, goes for the welding of the poor material of solderability, can meet the physicochemical property requirement of weld seam ultralow-hydrogen low, high-strength and high ductility, high cleanliness, be widely used in the welding of the high-alloy steel such as high-strength steel, stainless steel structure.
The development starting comparatively morning of Bridges in Our Country steel, but slower development, 60 ~ eighties of 20th century develops 16Mnq, 15MnVq, 15MnVNq etc., and wherein 16Mnq is widely used, but impact flexibility is on the low side.The eighties, Jiujiang Bridge have employed 15MnVNq, but owing to have employed the V of high strength, cause steel plate low-temperature impact toughness and welding performance poor.Develop 14MnNbq (Q370q) railroad bridge steel the nineties, it has excellent low-temperature impact toughness, can meet the requirement that general bridge is built.
At present, it is that four-track line six-lane highway builds bridge jointly that the Shanghai that China is building leads to the railway Yangtze Bridge, and main channel bridge adopts main span 1092m two tower five across Cable-stayed Bridge Scheme, requires that the Q500qE bridge steel plate adopting more high strength builds key position component.But existing welding material all can not meet the welding requirements of this high-intensity high-tenacity.Therefore the sintered flux developing the welding of a kind of Q500qE of being suitable for bridge steel becomes important topic.
High alkalinity slag system sintered flux easily obtains high tenacity weld seam, but for acquisition high-intensity high-tenacity weld metal and good welds processing performance, still there is very large technical difficulty, when particularly throat thickness is greater than the large thick steel plate of 32mm or even 60mm, due to multi-layer multi-pass welding, the welding bead of rear weldering plays thermal processes act to front road weld seam, seam organization is changed, easily causes weld metal low-temperature impact to absorb merit and decline and fluctuate widely.Therefore, original welding material is adopted can not to meet the welding requirements of Q500qE bridge steel high-strength and high-ductility.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of high strength and the Q500qE steel sintered flux used for submerged arc welding that requires of high tenacity and preparation method thereof that can meet weld metal simultaneously.
For solving the problems of the technologies described above, 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: CaF
236% ~ 37.5%, Al
2o
327.5% ~ 29%, MgO13% ~ 15%, SiO
214% ~ 18%, CaO1% ~ 3%, Na
2o/K
2o1% ~ 2%, SeO
20.5% ~ 1.0% and FeSi75-A1.0 ~ 1.3%.
As preferably, the weight content of the main chemical compositions of described FeSi75-A is: Si72% ~ 80%, C≤0.1%, Mn≤0.5%, Cr≤0.5%, S≤0.02%, P≤0.035%, and surplus is iron.
A preparation method for Q500qE steel sintered flux used for submerged arc welding, its method step is as follows:
(1) take raw material according to chemical component weight proportioning, the raw material weighed up are put in dry agitator and carry out dry stirring;
(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 stirred is sent into comminutor and carry out granulation;
(4) by the granular material produced after heated-air drying, send in drying oven and dry;
(5) granular material after oven dry is sieved, sieve out the material of standard particle size;
(6) sinter in the standard particle size material sieved out feeding sintering furnace, after sintering a period of time, cooling of coming out of the stove;
(7) cooled material of coming out of the stove is tested successively, sieves, packs, is put in storage, completes the preparation process of sintered flux.
As preferably, the waterglass weight added in described step (2) is 20% of raw material gross weight.
As preferably, the temperature in described step (4) in drying oven is 180 DEG C ~ 230 DEG C.
As preferably, the temperature in described step (6) in sintering furnace is 800 DEG C ~ 850 DEG C.
As preferably, the sintering time in described step (6) is 1 hour.
The basicity of Q500qE steel of the present invention sintered flux used for submerged arc welding is 1.68 ~ 1.80, can reduce soldering wire alloy melting loss of elements in welding process, guarantee the intensity of weld metal, thus improves weld metal low-temperature impact toughness.
The basic anhydride that in increase sintered flux, decomposition pressure is relatively little, as the content of Al2O3, MgO, CaO, Na2O, K2O etc., because basic anhydride stability is more much larger than FeO, generally do not show oxidisability, so oxygen content is also lower in weld seam.Reduce the relatively large acidic oxide of decomposition pressure as the content of SiO2, TiO2 etc. simultaneously, be designed to " anaerobic " or hypoxemia solder flux, reduce the oxidation of flux component Resistance of Weld Metal, in control weld metal, oxygen content is in 162ppm ~ 200ppm scope.
Ensure the degree of purity of weld metal, because manganese ore S, P content is high, present invention, avoiding and directly adopt manganese ore to obtain MnO; Add the addition of C aO, control S, P impurity content in raw material, increase the effect that weld seam takes off S, P further.
By adjusting the viscosity of solder flux, surface tension and fusing point etc., thus improving the processability of weld seam and the deslag performance of slag, improving welding technological properties, ensure face of weld quality.
CaF2 in solder flux raw material is indispensable slag forming constituents, and it has the effect improving flux basicity, dilution slag, reduction slag fusing point, significantly can reduce the oxygen content in deposited metal simultaneously.When CaF2 content in solder flux is less than 36%, owing to forming welding slag quantity not sufficient, the fusing point of slag is too high, the poor fluidity of slag, and the face shaping of welding bead worsens, and can not get the effect reducing oxygen content in weld metal simultaneously; On the other hand, when in solder flux, CaF2 content is greater than 37.5%, electric arc is unstable, easily produces current interruption phenomenon, and the mobility of slag is large, easily causes weld metal shaping irregular.Therefore, in solder flux, CaF2 content controls to be optimum efficiency in 36% ~ 37.5% scope.CaF2 adds with the form such as fluorite or ice crystal.
MgO in solder flux raw material is indispensable slag forming constituents, and it has the effect improving flux basicity, significantly reduce oxygen content in deposited metal.The fusing point of MgO, up to 2700 DEG C, gives the heat-resisting quantity that solder flux is very large, is the important component that large-line energy solder flux ensures appearance of weld.Comparatively during Large Heat Input Welding, weld shape is stablized.When content of MgO in solder flux is less than 13%, owing to forming welding slag quantity not sufficient, the face shaping of welding bead worsens; When in solder flux, content of MgO is greater than 15%, the surface tension of slag increases, and the viscosity of slag improves, and the slag extrusion molten metal of welding bead root, welding bead is snakelike.Therefore, in solder flux, content of MgO controls to be optimum efficiency in 13% ~ 15% scope.The raw material of MgO adds with reheating magnesia form.
CaO in solder flux raw material is the alkaline slag forming constituents improving weld metal toughness, and it has the effect improving flux basicity, significantly reduce oxygen content in deposited metal.When in solder flux, CaO content is less than 3%, basic clinker quantity not sufficient, the face shaping of welding bead worsens, and can not get the effect reducing oxygen content in deposited metal simultaneously; On the other hand, when in solder flux, CaO content is greater than 3%, the density of slag and surface tension increase, and slag fluidity is poor, and weld bead shape is bad, and deslag performance declines.Therefore, in solder flux, CaO content controls to be optimum efficiency in 1% ~ 3% scope.The raw material of CaO uses marble, wollastonite etc.
The Na of a small amount of (adding up to 1% ~ 2%) is selected in solder flux raw material
2o/K
2o, Na
2o or K
2o has the effect of stable arc.Na in solder flux
2o or K
2when the total of O is less than 1%, electric arc is unstable, and welding bead is rough and uneven in surface; Na in solder flux
2o or K
2when the total of O is greater than 2%, the resistance to moisture absorption of solder flux declines, and easily produces pockmark and impression.Therefore, Na
2o or K
2the total content of O is 1% ~ 2% is optimum efficiency.Na
2o or K
2the main source of O is sodium silicate, the potassium-sodium water glass of potassic feldspar and adhesive.
Al in solder flux raw material
2o
3it is the neccessary composition improving dry slag.Al
2o
3decomposition pressure less than FeO, belong to metastable oxide, do not improve the oxygen content of deposited metal.Al
2o
3to be fusing point the be high-temperature refractory of 2050 DEG C is the important component ensureing appearance of weld in large-line energy solder flux.Al in solder flux
2o
3when content is less than 27.5%, during Large Heat Input Welding, postwelding welding bead dry slag, welding bead is shaping bad; Al in solder flux
2o
3when content is greater than 29%, weld seam is narrow, convexly weld seam, fuses bad with mother metal, produces slag inclusion.Therefore, the Al in solder flux
2o
3content controls to be optimum efficiency in 27.5% ~ 29% scope.Al
2o
3mainly add with forms such as aluminium oxide, bauxite, flint claies.
SiO in solder flux raw material
2it is the neccessary composition obtaining good process performance.But SiO
2that there is the composition reducing slag basicity, improve the effect of deposited metal oxygen content.SiO in solder flux
2when content is less than 14%, welding bead is shaping bad, and welding technological properties is undesirable; SiO in solder flux
2when content is greater than 18%, reduce the basicity of solder flux, improve the oxygen content in deposited metal, reduce the toughness of deposited metal.Therefore, the SiO in solder flux
2content controls to be optimum efficiency in 14% ~ 18% scope.SiO
2bring into the interpolation of the form such as wollastonite, flint clay and binding agent.
SeO in solder flux raw material
2be surface active element, change the surface nature of liquid metal, make hydrogen be difficult to enter liquid metal, thus reduce the diffusible hydrogen content of deposited metal.SeO
2addition be advisable 0.5% ~ 1.0%, lower than 0.5% time, DeGrain, during more than 1.0%, causes into appearance of weld bad.
The beneficial effect adopting technique scheme to produce is as follows:
The sintered flux that the present invention produces is the high toughness sintering solder that can adapt to the submerged-arc welding of Q500qE high-strength bridge steel, while ensureing that weld metal has high strength, excellent low temperature impact toughness, has excellent welding technological properties.
The sintered flux that invention is produced is when the submerged arc butt welding of large span high-strength bridge steel slab, and not preheating before weldering, postwelding are not heat-treated, and meet high strength and the high tenacity requirement of weld metal simultaneously.
Utilize the weld metal low-temperature impact toughness of sintered flux of the present invention, Charpy impact energy Akv (-40 DEG C): 193J ~ 213J, the dispersion of impact absorbing energy is very little.Sintered flux of the present invention is in welding process, and fusing point, the viscosity coefficient of dross of slag are moderate, and when molten bath is solidified, face of weld does not produce gas impression, has good appearance of weld.Slag surface tension force is lower, and deslag after welding is easy, and weld edge transition is steady, and smooth surface, weld appearance forming quality is good, has good welding technological properties.Sintered flux of the present invention also can mate with multiple welding wire, can weld multiple low-alloy steel and bridge steel.
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, 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: CaF
237.2%, Al
2o
328%, MgO14%, SiO
216%, CaO1%, Na
2o/K
2o2%, SeO
20.5% and FeSi75-A1.3%.
The preparation method of above-mentioned Q500qE steel sintered flux used for submerged arc welding, its concrete steps are as follows:
(1) take raw material according to chemical component weight proportioning, the raw material weighed up are put in dry agitator and carry out dry stirring;
(2) the dry raw material stirred are put into wet agitator, then add account for raw material gross weight 20% waterglass, carry out wet stirring;
(3) the wet material stirred is sent into comminutor and carry out granulation;
(4) by the granular material produced after heated-air drying, sending into temperature is dry in the drying oven of 180 DEG C ~ 230 DEG C;
(5) granular material after oven dry is sieved, sieve out the material of standard particle size;
(6) the standard particle size material sieved out being sent into temperature is sinter in the sintering furnace of 800 DEG C ~ 850 DEG C, sinters after 1 hour, cooling of coming out of the stove;
(7) cooled material of coming out of the stove is tested successively, sieves, packs, is put in storage, completes the preparation process of sintered flux.
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: CaF
236%, Al
2o
329%, MgO13%, SiO
216.3%, CaO3%, Na
2o/K
2o1%, SeO
20.7% and FeSi75-A1.0%.
The preparation method of above-mentioned Q500qE steel sintered flux used for submerged arc welding, its concrete steps are as follows:
(1) take raw material according to chemical component weight proportioning, the raw material weighed up are put in dry agitator and carry out dry stirring;
(2) the dry raw material stirred are put into wet agitator, then add account for raw material gross weight 20% waterglass, carry out wet stirring;
(3) the wet material stirred is sent into comminutor and carry out granulation;
(4) by the granular material produced after heated-air drying, sending into temperature is dry in the drying oven of 180 DEG C ~ 230 DEG C;
(5) granular material after oven dry is sieved, sieve out the material of standard particle size;
(6) the standard particle size material sieved out being sent into temperature is sinter in the sintering furnace of 800 DEG C ~ 850 DEG C, sinters after 1 hour, cooling of coming out of the stove;
(7) cooled material of coming out of the stove is tested successively, sieves, packs, is put in storage, completes the preparation process of sintered flux.
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: CaF
236.8%, Al
2o
327.5%, MgO14%, SiO
217%, CaO1%, Na
2o/K
2o1.5%, SeO
21.0% and FeSi75-A1.2%.
The preparation method of above-mentioned Q500qE steel sintered flux used for submerged arc welding, its concrete steps are as follows:
(1) take raw material according to chemical component weight proportioning, the raw material weighed up are put in dry agitator and carry out dry stirring;
(2) the dry raw material stirred are put into wet agitator, then add account for raw material gross weight 20% waterglass, carry out wet stirring;
(3) the wet material stirred is sent into comminutor and carry out granulation;
(4) by the granular material produced after heated-air drying, sending into temperature is dry in the drying oven of 180 DEG C ~ 230 DEG C;
(5) granular material after oven dry is sieved, sieve out the material of standard particle size;
(6) the standard particle size material sieved out being sent into temperature is sinter in the sintering furnace of 800 DEG C ~ 850 DEG C, sinters after 1 hour, cooling of coming out of the stove;
(7) cooled material of coming out of the stove is tested successively, sieves, packs, is put in storage, completes the preparation process of sintered flux.
The basicity of the above-mentioned sintered flux produced is 1.68, and weld metal oxygen content is 200ppm.
Draw through test, when sintered flux chemical composition content is not in institute of the present invention restriction range, flux basicity will lower than 1.68, and weld metal oxygen content higher than 200ppm, will not meet best performance requirement.
In sum, the sintered flux that the present invention produces is the high toughness sintering solder that can adapt to the submerged-arc welding of Q500qE high-strength bridge steel, while ensureing that weld metal has high strength, excellent low temperature impact toughness, has excellent welding technological properties.
The sintered flux that invention is produced is when the submerged arc butt welding of large span high-strength bridge steel slab, and not preheating before weldering, postwelding are not heat-treated, and meet high strength and the high tenacity requirement of weld metal simultaneously.
Utilize the weld metal low-temperature impact toughness of sintered flux of the present invention, Charpy impact energy Akv (-40 DEG C): 193J ~ 213J, the dispersion of impact absorbing energy is very little.Sintered flux of the present invention is in welding process, and fusing point, the viscosity coefficient of dross of slag are moderate, and when molten bath is solidified, face of weld does not produce gas impression, has good appearance of weld.Slag surface tension force is lower, and deslag after welding is easy, and weld edge transition is steady, and smooth surface, weld appearance forming quality is good, has good welding technological properties.Sintered flux of the present invention also can mate with multiple welding wire, can weld multiple low-alloy steel and bridge steel.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a Q500qE steel sintered flux used for submerged arc welding, is characterized in that, the weight content of its main chemical compositions is: CaF
236% ~ 37.5%, Al
2o
327.5% ~ 29%, MgO13% ~ 15%, SiO
214% ~ 18%, CaO1% ~ 3%, Na
2o/K
2o1% ~ 2%, SeO
20.5% ~ 1.0% and FeSi75-A1.0 ~ 1.3%.
2. a kind of Q500qE steel according to claim 1 sintered flux used for submerged arc welding, it is characterized in that, the weight content of the main chemical compositions of described FeSi75-A is: Si72% ~ 80%, C≤0.1%, Mn≤0.5%, Cr≤0.5%, S≤0.02%, P≤0.035%, and surplus is iron.
3. a preparation method for Q500qE steel sintered flux used for submerged arc welding, is characterized in that, its method step is as follows:
(1) take raw material according to chemical component weight proportioning, the raw material weighed up are put in dry agitator and carry out dry stirring;
(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 stirred is sent into comminutor and carry out granulation;
(4) by the granular material produced after heated-air drying, send in drying oven and dry;
(5) granular material after oven dry is sieved, sieve out the material of standard particle size;
(6) sinter in the standard particle size material sieved out feeding sintering furnace, after sintering a period of time, cooling of coming out of the stove;
(7) cooled material of coming out of the stove is tested successively, sieves, packs, is put in storage, completes the preparation process of sintered flux.
4. the preparation method of a kind of Q500qE steel according to claim 3 sintered flux used for submerged arc welding, is characterized in that, the waterglass weight added in described step (2) is 20% of raw material gross weight.
5. the preparation method of a kind of Q500qE steel according to claim 3 sintered flux used for submerged arc welding, is characterized in that, the temperature in described step (4) in drying oven is 180 DEG C ~ 230 DEG C.
6. the preparation method of a kind of Q500qE steel according to claim 3 sintered flux used for submerged arc welding, is characterized in that, the temperature in described step (6) in sintering furnace is 800 DEG C ~ 850 DEG C.
7. the preparation method of a kind of Q500qE steel according to claim 3 sintered flux used for submerged arc welding, is characterized in that, the sintering time in described 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 |
| CN112496596A (en) * | 2021-02-07 | 2021-03-16 | 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN112496596A (en) * | 2021-02-07 | 2021-03-16 | 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 |
| 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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| Publication number | Publication date |
|---|---|
| CN105234589B (en) | 2017-09-05 |
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