CN109175779A - A kind of bridge steel Q500qE flux-cored wire used for welding - Google Patents

A kind of bridge steel Q500qE flux-cored wire used for welding Download PDF

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CN109175779A
CN109175779A CN201811239052.9A CN201811239052A CN109175779A CN 109175779 A CN109175779 A CN 109175779A CN 201811239052 A CN201811239052 A CN 201811239052A CN 109175779 A CN109175779 A CN 109175779A
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flux
welding
cored wire
powder
bridge steel
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CN109175779B (en
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刘胜新
陈永
连明洋
孟迪
王靖博
王瑞娟
陈志民
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Zhengzhou University
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Zhengzhou University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/3073—Fe as the principal constituent with Mn as next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding
    • B23K35/406—Filled tubular wire or rods

Abstract

The invention belongs to technical field of welding materials, in particular to a kind of bridge steel Q500qE flux-cored wire used for welding.Flux-cored wire is made of cold-rolled strip package medicine core powder, and medicine core powder accounts for the 15% ~ 18% of welding wire gross mass.Drug core component and dosage are by mass percentage are as follows: nm-class boron nitride 1.0% ~ 1.5%, Cr 1.2% ~ 2.2%, Nb 0.2% ~ 0.3%, Ni 2.0% ~ 3.0%, Ti 0.1% ~ 0.2%, FeSi45 ferrosilicon powder 3.5% ~ 6.0%, ZrF21.8% ~ 3.0%, Cu 1.0% ~ 1.5%, Mn 6.5% ~ 7.8%, surplus are iron powder.The preparation method of flux-cored wire of the present invention is simple, and weld(ing) deposit tensile strength with higher and lower yield strength, yield tensile ratio is small, and impact flexibility when low temperature meets requirement, and atmospheric corrosion resistance is strong.

Description

A kind of bridge steel Q500qE flux-cored wire used for welding
Technical field
The present invention relates to field of welding material, more particularly to a kind of bridge steel Q500qE flux-cored wire used for welding.
Technical background
Flux-cored wire is a kind of new welding material, also referred to as flux cored wire, be presently available for automatic welding, semiautomatic welding, Gas shielded arc welding, flux-cored wire can by adjusting the alloying component type and ratio of medicinal powder, easily design it is various not With the welding material of purposes, because of the adjustment that its alloying component can be flexible and convenient, weld metal is high-quality, the adaptability with base material By force, welding production efficiency is high.
The bridge steel plate in China experienced a veryer long development process, build the used steel plate of bridge of completion Yield strength gradually develops to 420MPa rank to 370MPa rank again from 235MPa to 345MPa.Bridge steel plate is in addition to height to be had Tensile strength, also require have certain yield tensile ratio；Yield tensile ratio is smaller, and the potential ability of structure collapse resistance is stronger, once overload, Also it can be found early due to plastic deformation and catastrophic collapse will not occur.In addition, atmospheric corrosion resistance requires to be also to measure bridge The weld(ing) deposit of joist steel whether He Ge important indicator.
The yield strength rank that the logical bridge in China Shanghai put into operation in 2015 uses is the new generation of bridge steel of 500MPa Q500qE, the yield tensile ratio of the material and its plasticity, fatigue crack growth rate, low stress cycle performance and fracture toughness relationship are not Greatly, elongation percentage is 20% or more, with good plasticity and preferable crack arrest ability and the reallocation ability concentrated to stress. In addition, Q500qE high performance bridge steel base material ductile-brittle transition temperature ratio Q370qE and Q345qD bridge steel substantially reduce, have good Good low-temperature impact toughness, weld metal ductile-brittle transition temperature are suitable with Q370qE bridge steel weld seam.With the reduction of temperature, The fracture toughness of Q500qE base material reduces significantly after temperature is down to -40 DEG C or less.5 kinds of railway steel bridge typical structures The fatigue test for making details shows that Q500qE high-performance steel is compared with the Q370qE bridge steel being commonly used, typical structure The fatigue strength for making details all slightly improves, and the fatigue behaviour of Q500qE high-performance steel can satisfy the requirement of railway steel bridge (" application study of the 500MPa grades of high-performance steels (Q500qE) in railway steel bridge ", Tian Yue, China Academy of Railways Sciences, 2010).
The matching of welding material and base material, intensity, toughness, chemical component are extremely important for welding effect, existing skill To the seldom of bridge steel Q500qE matched flux-cored wire research and development in art.
State Bureau of Technical Supervision has issued new standard GB/T 714-2015 " structural steel for bridge " on September 11st, 2015 (implementation on June 1st, 2016) is instead of GB/T 714-2008, wherein most important change is to absorb energy value to low-temperature impact (KV2) value significantly adjusted, KV when will be -40 DEG C original2Value is increased to 120J by 47J, and increases in Appendix B Added recommend yield tensile ratio (Q345q, Q370q, Q420q can refer to 0.85 and hold no more than 0.85, Q460q ~ Q690q agreement Row), the calculation formula of the corrosion resistance index I using the chemical component prediction steel of steel is proposed in appendix C, by ASTM correlation Standard steel have preferable atmospheric corrosion resistance index value I should be not less than 6.0.
Chinese patent CN104588919B discloses a kind of mating flux-cored wire of high-strength bridge steel Q500qE, is using titanium The welding wire of type slag system preparation, welding wire have good processing performance, make to melt by the way that Ni, Cr, Cu and Sb are added in drug core component Metallisation mechanical property and corrosion resistance meet the requirements.But the patent application day is on December 1st, 2014, by its claim The result that the welding wire of production obtains has not met the regulation of new nation's standard, -40 be mainly manifested in embodiment 1,2,3 DEG C when KV2It is worth (3 samples of test) respectively " 101J, 105J, 102J ", " 98J, 93J, 104J ", " 112J, 100J, 105J ", this point do not meet the regulation (>=120J) of new standard in 2015；Yield tensile ratio in additional embodiment 1,2,3 is respectively 0.87,0.86,0.87, it has been higher by the recommendation (≤0.85) of new standard；In addition, there is no the corrosion resistances by steel for the patent Formula of index calculates the atmospheric corrosion resistance index value I of steel, now by calculating the corresponding three value I of embodiment 1,2,3 Respectively 7.149,3.790,5.699, only embodiment 1 meet ASTM relevant criterion and require (I >=6.0), the I of embodiment 2 and 3 Value and requirement have certain gap, illustrate that the corrosion resistance of its deposited metal is unsatisfactory.
Chinese patent CN105772983B discloses a kind of mating flux-cored wire of high-strength bridge steel Q500qE and its preparation Method, the applying date are on January 18th, 2016, are during new national standard has been announced but is unenforced, right is wanted The quality provided and to raw material has been carried out to alloying element in asking and purity has carried out strict control.In the description the 0024th What section obtained is " abrasion-proof overlaying welding flux-cored wire ", with " the deposition illustrated in its advantages (in specification the 0028th section) Metal Mechanic Property and deposited metal corrosion resistance are able to satisfy the welding requirements of bridge steel Q500qE " there is no consistency；In addition, tool In body embodiment and lower yield strength value and tensile strength values that unlisted embodiment obtains, its yield tensile ratio also can not be just calculated Whether the recommendation requirement of new national standard " no more than 0.85 " is met, and to -40 DEG C greatly improved in new national standard When KV2Value (minimum value is increased to 120J by 47J) does not also refer to, more without calculating by the corrosion resistance formula of index of steel The atmospheric corrosion resistance index value I of steel.In summary, design and reality which is still carried out by GB/T 714-2008 substantially It tests.
Summary of the invention
The object of the invention is to a kind of bridge steel Q500qE welding provided to solve the deficiency of the prior art to use Flux-cored wire, deposited metal composition, mechanical property and the corrosion resistance of the flux-cored wire can satisfy bridge steel The welding requirements of Q500qE.
To achieve the above object, the present invention adopts the following technical scheme: a kind of bridge steel Q500qE flux-cored wire used for welding, Including crust and medicine core, the drug core component and dosage are by mass percentage are as follows: nm-class boron nitride 1.0% ~ 1.5%, Cr 1.2% ~ 2.2%, Nb 0.2% ~ 0.3%, Ni 2.0% ~ 3.0%, Ti 0.1% ~ 0.2%, FeSi45 ferrosilicon powder 3.5% ~ 6.0%, ZrF2 1.8%~ 3.0%, Cu 1.0% ~ 1.5%, Mn 6.5% ~ 7.8%, surplus are iron powder.
The partial size of the nm-class boron nitride is 30 ~ 70nm.
The FeSi45 ferrosilicon powder be atomization ferrosilicon powder, chemical component by mass percentage: Si 45.0% ~ 47.0%, Mn 0 ~ 0.7%, Cr 0 ~ 0.5%, P 0 ~ 0.04%, S 0 ~ 0.02%, surplus Fe.
The medicine core quality accounts for the 15% ~ 18% of flux-cored wire gross mass (i.e. filling rate).
The 80 mesh percent of pass of medicine core powder is 100%.
Purity >=99.6% of the Cr, purity >=99.9% of the Nb, purity >=99.9% of the Ni, the Ti's Purity >=99.9%, the ZrF4Purity >=99.0%, purity >=99.6% of the Cu, purity >=99.6% of the Mn.
The gage of wire is 1.2 ~ 2.8mm.
The crust is the low-carbon cold rolling steel band of 10 ~ 14mm of width, 0.4 ~ 0.8mm of thickness, in the chemical component of steel band Mass percent are as follows: C 0 ~ 0.035%, Mn 0.2% ~ 0.35%, Si 0 ~ 0.028%, S 0 ~ 0.01%, P 0 ~ 0.01%, surplus are Fe；The tensile strength of steel band is 220 ~ 450MPa, and elongation is not less than 38%.
A kind of bridge steel Q500qE flux-cored wire used for welding, preparation step are as follows:
(1) sorting: the raw material of above-mentioned chemical component is selected to carry out quality purity control；
(2) medicinal powder is handled: medicinal powder is put into open quartz container, is subsequently placed in drying box and dries, 150 DEG C of drying temperature ± 5 DEG C, 50 ~ 60min of drying time；
(3) it sieves powder: using 80 mesh screens to be sieved respectively in the powder after drying, save fine powder after sieving；
(4) match powder and mixed powder: the medicinal powder after weighing sieving in proportion is added in mixed powder machine, mixing is stirred, after being stirred At mixed powder；
(5) steel band rolling and medicinal powder encapsulation: by low-carbon cold rolling steel band be placed on flux-cored wire forming machine put band machine on, pass through into Low-carbon cold rolling steel band is rolled into U-type groove by type machine, the mixed powder that step (4) obtain then is added into U-type groove, then pass through into Type machine by U-type groove roll closure formed it is O-shaped, make medicinal powder package wherein, through wire drawing machine by road drawing, tube reducing, be drawn to 1.2 ~ 2.8mm obtains flux-cored wire, and disk is at disk, sealed package.
The design principle of each chemical element in bridge steel Q500qE flux-cored wire used for welding of the present invention are as follows:
FeSi45 is atomized ferrosilicon powder: other than with good deoxidation, silicon is also solid-solubilized in ferrite and austenite silicon, can To improve the intensity of weld metal；Meanwhile the silicon for adding certain content can also increase the mobility of weld metal, so that welding wire There is good welding technological properties in the welding process." atomization " in atomization ferrosilicon powder refers to be used during melting ferrosilicon Hydraulic atomized production, impurity content is few in production process, and degree of purity is high.
The corrosion resistance of deposited metal can be improved in Cr:Cr, in addition it can fining ferrite grains, increases metal secondary structure Obdurability, but cannot be too high, otherwise will increase cool attenuation and reduce toughness, Cr in deposited metal in the technical program Mass percent control in 0.15% ~ 0.40% range, calculated by filling rate 15% ~ 18%, Cr content is Cr 1.2% in medicine core ~2.2%。
Nb:Nb has good corrosion resistance, and reduces the content of the impurity elements such as carbon, oxygen, improves the corrosion resistance of deposited metal, And Nb can also improve the impact flexibility of deposited metal to a certain extent.
The intensity and impact flexibility of deposited metal can be improved in Ni:Ni, and the low-temperature impact of especially raising deposited metal is tough Property, and brittle transition temperature is reduced, and Ni has fabulous atmospheric corrosion resistance ability.
Ti:Ti can form titanyl compound with oxygen, form titanium carbide with carbon, can be used as transgranular secondary as deoxidier The nucleation mass point of seam organization refines crystal grain, improves the mechanical property of deposited metal.
Nm-class boron nitride: 1. under the action of electric arc heat input, a part of boron nitride is decomposed into B element and N element, wherein B can be solid-solution in austenite grain boundary, enhance grain boundary effect, inhibit the forming core of pro-eutectoid ferrite and grow up, avoid crystal boundary shape At grain boundary ferrite, and due to the presence of Ti, make Ti and oxygen preferential interaction, protection B is not oxidized, to guarantee the effect hair of boron It waves；The N element a part volatilization decomposited, a part are solid-solution in iron, form clearance-type solid solution, make the low temperature of deposited metal Impact flexibility increases significantly；2. the nm-class boron nitride for not having enough time decomposing then is used as nucleation mass point, deposited metal is refined Crystal grain, increase its intensity and toughness；Nm-class boron nitride surface atom number increases, large specific surface area, and specific surface energy is high, largely Interface provide highdensity short distance fast diffusion path for atom diffusion, while nm-class boron nitride surface atom has high change Learn activity, it is easy to make its diffusion coefficient much larger than conventional material in conjunction with other atoms, this point is to raising deposited metal Impact flexibility has apparent effect.1. and 2. from from the point of view of two o'clock, the addition effective use B element and N element of nm-class boron nitride are come Low-temperature impact toughness is improved, undecomposed part refines crystal grain as nucleation mass point, holds very much additionally, due to the structure of its nano-scale Easily in conjunction with other atoms, the non-uniform field trash of size would not be generated in deposited metal, to the comprehensive of deposited metal The raising for closing mechanical property especially low-temperature impact toughness has remarkable effect.
ZrF4: Zr can be improved the low-temperature impact toughness of deposited metal；The fluorine ion generated in welding process is reacted with hydrogen, The residual hydrogen content of deposited metal can be reduced, and then improves its low-temperature impact toughness.
Cu: improving corrosion resistance, enhances weather-resistant performance；And when the mass percent of Cu is less than 0.50%, effect It is mainly shown as solution strengthening, the technical program uses the solution strengthening effect of Cu, controls its quality hundred in deposited metal Divide than being 0.10% ~ 0.30%.
Mn:Mn is the beneficial element for increasing weld metal strength and toughness, and the increase of manganese content not only contributes to prevent weld seam golden There is fire check in category, also helps the deoxidation of weld metal.But, it if manganese content is excessively high is easy for that deposited metal is caused to occur partially Analysis and crackle, are also easy to keep the carbon equivalent of deposited metal excessive, there is the risk for reducing weld metal toughness.Thus, this technology side Mass percent in case by Mn element in medicinal powder controls below 7.8%, it is ensured that the mass percent of Mn is not in deposited metal Refer to that the Mn in carbon steel coating and medicinal powder dissolves in deposited metal altogether greater than 1.8%().
The beneficial effects of the present invention are: the B and N element that are 1. decomposited by the boron nitride under arcing strengthen crystal boundary simultaneously Improve low-temperature impact toughness；Undecomposed nano silicon nitride boron particles can be refined crystal grain using its nanostructure and reduce field trash It generates, and then improves the comprehensive mechanical property of deposited metal；2. improving the resistance to of deposited metal by the way that the elements such as Nb, Ni, Cu are added Corrosivity, and Nb, Ni can effectively improve the low-temperature impact toughness of deposited metal；3. usually improving deposition gold by adding Mn member The intensity and toughness and cracking resistance of category；4. passing through addition ZrF2, the H content in deposited metal is further decreased using F, And Zr element also can effectively improve low-temperature impact toughness；5. flux-cored wire of the invention passes through the welding table on Q500qE It is bright: the welding technological properties of welding wire is good, weld seam take off slag be easy, beautiful appearance, deposited metal composition, mechanical property and Corrosion resistance can meet the welding requirements of bridge steel Q500qE, yield tensile ratio≤0.83, -40 DEG C of KV2Value greatly improves, resistance to Atmospheric corrosiveness index value I >=6.415.
Specific embodiment
Principles and features of the present invention are described with reference to embodiments, listed give an actual example is served only for explaining this hair It is bright, not limit the scope of the invention.
Embodiment 1:
Carrying out following processes first: sorting, → medicinal powder is handled → sieves powder → with powder and mixed powder；Then selecting width is 14mm, thickness For the cold-rolled strip of 0.5mm, it is pressed by molding machine U-shaped；Mixed medicine core powder is filled into U-type groove again, medicine core silty Amount accounts for the 15% of flux-cored wire quality；U-type groove opening is healed up again, and it is O-shaped to be formed, to make medicine core package wherein, through wire drawing machine By road drawing, tube reducing, the welding wire of Ф 1.2mm, i.e., bridge steel Q500qE flux-cored wire used for welding of the invention are obtained.
The drug core component and dosage are by mass percentage are as follows: nm-class boron nitride 1.5%, Cr 2.2%, Nb 0.3%, Ni 3.0%, Ti0.2%, FeSi45 ferrosilicon powder 5.8%, ZrF22.8%, Cu 1.45%, Mn 7.6%, surplus are iron powder.
Embodiment 2:
Carrying out following processes first: sorting, → medicinal powder is handled → sieves powder → with powder and mixed powder；Then selecting width is 14mm, thickness For the cold-rolled strip of 0.5mm, it is pressed by molding machine U-shaped；Mixed medicine core powder is filled into U-type groove again, medicine core silty Amount accounts for the 15% of flux-cored wire quality；U-type groove opening is healed up again, and it is O-shaped to be formed, to make medicine core package wherein, through wire drawing machine By road drawing, tube reducing, the welding wire of Ф 1.8mm, i.e., bridge steel Q500qE flux-cored wire used for welding of the invention are obtained.
The drug core component and dosage are by mass percentage are as follows: nm-class boron nitride 1.35%, Cr 1.8%, Nb 0.25%, Ni 2.5%, Ti 0.15%, FeSi45 ferrosilicon powder 4.5%, ZrF22.5%, Cu 1.3%, Mn 7.3%, surplus are iron powder.
Embodiment 3:
Carrying out following processes first: sorting, → medicinal powder is handled → sieves powder → with powder and mixed powder；Then selecting width is 14mm, thickness For the cold-rolled strip of 0.5mm, it is pressed by molding machine U-shaped；Mixed medicine core powder is filled into U-type groove again, medicine core silty Amount accounts for the 15% of flux-cored wire quality；U-type groove opening is healed up again, and it is O-shaped to be formed, to make medicine core package wherein, through wire drawing machine By road drawing, tube reducing, the welding wire of Ф 2.8mm, i.e., bridge steel Q500qE flux-cored wire used for welding of the invention are obtained.
The drug core component and dosage are by mass percentage are as follows: nm-class boron nitride 1.0%, Cr 1.2%, Nb 0.2%, Ni 2.0%, Ti 0.108%, FeSi45 ferrosilicon powder 3.5%, ZrF21.8%, Cu 1.0%, Mn 6.5%, surplus are iron powder.
Comparative example 1:
Carrying out following processes first: sorting, → medicinal powder is handled → sieves powder → with powder and mixed powder；Then selecting width is 14mm, thickness For the cold-rolled strip of 0.5mm, it is pressed by molding machine U-shaped；Mixed medicine core powder is filled into U-type groove again, medicine core silty Amount accounts for the 15% of flux-cored wire quality；U-type groove opening is healed up again, and it is O-shaped to be formed, to make medicine core package wherein, through wire drawing machine By road drawing, tube reducing, the welding wire of Ф 1.6mm is obtained.
In addition to without " nm-class boron nitride ", other are identical for this comparative example and 2 drug core component of embodiment and dosage.
Comparative example 2:
Carrying out following processes first: sorting, → medicinal powder is handled → sieves powder → with powder and mixed powder；Then selecting width is 14mm, thickness For the cold-rolled strip of 0.5mm, it is pressed by molding machine U-shaped；Mixed medicine core powder is filled into U-type groove again, medicine core silty Amount accounts for the 15% of flux-cored wire quality；U-type groove opening is healed up again, and it is O-shaped to be formed, to make medicine core package wherein, through wire drawing machine By road drawing, tube reducing, the welding wire of Ф 1.8mm is obtained.
In addition to without " nm-class boron nitride ", other are identical for this comparative example and 3 drug core component of embodiment and dosage.
Welding wire welding on bridge steel Q500qE that embodiment 1,2,3 and comparative example 1,2 are obtained, welding current be 180 ~ 260A, weldingvoltage are 20 ~ 26V, speed of welding 18mm/s, gas flow 20L/min.By GB/T 25776-2010 " welding material welding technological properties assessment method " carries out processing performance evaluation, carries out deposited metal by GB/T223 series standard Chemical composition analysis, by GB/T 2652-2008 " weld seam and deposited metal stretching test method " and GB/T 2650-2008 " welding point impact test method " carries out Mechanics Performance Testing, and calculates yield tensile ratio and atmospheric corrosion resistance index value I, wherein I is calculated as follows:
I=26.01 (%Cu)+3.88 (%Ni)+1.20 (%Cr)+1.49 (%Si)+17.28 (%P) -7.29 (%Cu) (% Ni) -9.10 (%Ni) (%P) -33.39 (%Cu)2
The deposited metal composition of flux-cored wire is as shown in table 1.
The deposited metal mechanical property and corrosion resistance of flux-cored wire are as shown in table 2.
Above embodiments and comparative example show: 1. in the present invention when being not added with " nm-class boron nitride ", other elements it is reasonable Design meets the atmospheric corrosion resistance requirement of weld(ing) deposit, and lower yield strength meets requirement, but tensile strength is not inconsistent then It closes and requires, and yield tensile ratio is also undesirable, low-temperature impact absorbs energy value and is then lower than required value；It " is received 2. being added in the present invention When rice boron nitride ", the rational design of element meets the atmospheric corrosion resistance requirement of weld(ing) deposit, and lower yield strength, tension are strong Degree, yield tensile ratio, low-temperature impact absorb energy value and meet the requirements.
It should be pointed out that core of innovation of the invention is to give the constituent ingredient of medicine core and dosage, especially It is added to " nanoscale boron nitride " in medicine core powder, and the zone of reasonableness of each component has been determined, passes through the compound strong of multiple element Change realizes under the premise of ensuring use intensity, effectively improves low-temperature impact toughness, reduces yield tensile ratio, enhancing atmospheric corrosion resistance Energy.The especially addition of " nanoscale boron nitride ", B therein can be solid-solution in austenite grain boundary, strengthen grain boundary effect, inhibit first altogether It analyses ferritic forming core and grows up, part N is solid-solution in formation clearance-type solid solution in iron, significantly improves the low temperature punching of deposited metal Hit toughness；Undecomposed " nanoscale boron nitride " surface atom has high chemical activity, it is easy to make in conjunction with other atoms Its diffusion coefficient increases, and refines the crystal grain of deposited metal, increases its intensity and low-temperature impact toughness, improves the resultant force of weld seam Learn performance.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.All According to equivalent change or modification made by spirit of the invention, should be covered by the protection scope of the present invention.

Claims (5)

1. a kind of bridge steel Q500qE flux-cored wire used for welding, including crust and medicine core, the drug core component and dosage press quality Percentages are as follows: nm-class boron nitride 1.0% ~ 1.5%, Cr 1.2% ~ 2.2%, Nb 0.2% ~ 0.3%, Ni 2.0% ~ 3.0%, Ti 0.1% ~ 0.2%, FeSi45 ferrosilicon powder 3.5% ~ 6.0%, ZrF21.8% ~ 3.0%, Cu 1.0% ~ 1.5%, Mn 6.5% ~ 7.8%, surplus are iron Powder, the partial size of the nm-class boron nitride are 30 ~ 70nm, and the FeSi45 ferrosilicon powder is atomization ferrosilicon powder.
2. bridge steel Q500qE flux-cored wire used for welding according to claim 1, which is characterized in that the medicine core quality accounts for The 15% ~ 18% of flux-cored wire gross mass.
3. bridge steel Q500qE flux-cored wire used for welding according to claim 1, which is characterized in that 80 mesh of medicine core powder Percent of pass is 100%.
4. bridge steel Q500qE flux-cored wire used for welding according to claim 1, which is characterized in that the crust is width The low-carbon cold rolling steel band of 10 ~ 15mm, 0.4 ~ 0.8mm of thickness.
5. bridge steel Q500qE flux-cored wire used for welding described in one of -4 according to claim 1, which is characterized in that the welding wire Diameter is 1.2 ~ 2.8mm.
CN201811239052.9A 2018-10-23 2018-10-23 Flux-cored wire for welding bridge steel Q500qE Active CN109175779B (en)

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CN110238558A (en) * 2019-06-13 2019-09-17 华中科技大学 The metal-powder-core silk material and preparation method of the multidirectional steel node of electric arc fuse increasing material manufacturing
CN114505621A (en) * 2022-04-19 2022-05-17 西安热工研究院有限公司 Fe-Ni-Cr welding wire and preparation method and welding process thereof

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CN105127613A (en) * 2015-10-12 2015-12-09 国家电网公司 Flux-cored wire for welding Q420 steel and preparation method thereof
CN106078006A (en) * 2016-07-07 2016-11-09 中国船舶重工集团公司第七二五研究所 A kind of 550MPa high-strength steel ultralow-hydrogen low high tenacity seamless flux-cored wire
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CN114505621A (en) * 2022-04-19 2022-05-17 西安热工研究院有限公司 Fe-Ni-Cr welding wire and preparation method and welding process thereof
CN114505621B (en) * 2022-04-19 2022-07-08 西安热工研究院有限公司 Fe-Ni-Cr welding wire and preparation method and welding process thereof

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