CN105081611B - A kind of thin diameter flux wire being exclusively used in hot-work die reparation built-up welding - Google Patents

A kind of thin diameter flux wire being exclusively used in hot-work die reparation built-up welding Download PDF

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CN105081611B
CN105081611B CN201510608310.6A CN201510608310A CN105081611B CN 105081611 B CN105081611 B CN 105081611B CN 201510608310 A CN201510608310 A CN 201510608310A CN 105081611 B CN105081611 B CN 105081611B
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welding
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CN105081611A (en
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孙俊生
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Shandong University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24Selection of soldering or welding materials proper
    • B23K35/30Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053Fe as the principal constituent
    • B23K35/3073Fe as the principal constituent with Mn as next major constituent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40Making wire or rods for soldering or welding
    • B23K35/406Filled tubular wire or rods

Abstract

The invention provides a kind of be exclusively used in hot-work die repair built-up welding thin diameter flux wire, include welding wire tube wall be wrapped in its interior medicated powder;Described medicinal powder package contains deoxidizing alloy and slag former.By adding nano chromium nitride powder in iron(-)base powder, deposited metal forms tiny nitride gap phase, makes deposited metal have good toughness and cracking resistance;Meanwhile, add yittrium oxide in alloy powder, purify deposited metal, nodularization field trash, promote to form nitride strengthening phase, improve the anti-fatigue performance of deposited metal.The argon-rich gas shielded gas metal-arc welding technology of application flux-cored wire cooperation is repaired to hot-work die, and the deposited metal obtaining has excellent high-temperature oxidation resistance, wearability, cleanliness factor and good fatigue resistance energy.

Description

A kind of thin diameter flux wire being exclusively used in hot-work die reparation built-up welding
Technical field
The invention belongs to field of welding material, more particularly, to a kind of thin footpath medicated core weldering being exclusively used in hot-work die reparation built-up welding Silk.
Background technology
In recent years, with China's metallurgical industry and manufacturing fast development, mould particularly hot-work die, such as Hot-roller The consumption making roller, hot-forging die, hot extruding die, hot blanking die etc. is increasing, become in commercial production widely apply disappear One of consumable component.Mould lost efficacy because the reasons such as abrasion and heat exhaustion can produce peeling, scratch, abrasion etc. in use. How to improve the study hotspot of its service life always concern both at home and abroad.The life-span of mould depend primarily on mold materials, Several aspect such as structure design, Technology for Heating Processing, processing.China's die life only has external 1/2-1/3, there is precision The low, problem of process-cycle length.In view of the inefficacy of mould is mostly by surface, from save energy and resource, give full play to material Material performance potential simultaneously obtains property and maximum technical economic benefit is set out, and improves and improve the performance of die-face material It is the key extending die life.In production, the method frequently with built-up welding prepares alloy-layer on die blank, obtains double Metal die, had both reduced cost, improve the performance of mould again;Built-up welding is also the important technology that repairing mould extends its life-span Means.Built-up welding needs the welding material supporting with various die steels.
The welding material that built-up welding is commonly used has welding rod and welding wire.Welding rod adopts gas slag Combined Protection, and metallurgical quality is preferably, permissible By coating and core wire transition alloy elements, weld seam impurity content is few, cleanliness factor is higher, and weld seam has higher fatigue resistance Energy.Welding rod, using flexibly, is also relatively suitable for the short weld seam of mould repair and irregular weld seam operating mode simultaneously.Therefore, welding rod is commonly used In the Bead weld repair of small mould, people have developed multiple hot-work die surfacing weldings for this, and such as publication No. is The weight hundred of patent " hot forged mould Bead weld repair and remanufacture use special welding rod " its chemical composition of coating of CN102240872A Dividing than (wt%) is titanium dioxide 1-3, marble 25-40, fluorite 10-15, quartzy 3-5, chalk 2-4, and high carbon ferro-chrome 8-12 is high Carbon ferromanganese 2-4, ferrosilicon 2-4, ferrotianium 6-9, molybdenum-iron 9-11, cerium oxide 4-8, metallic nickel 5-8, graphite 1-2;Core wire is H08A. This welding rod adopts Cr-Ni-Mo alloy system, and the maximum level of electrode coating medium high carbon ferrochrome is 12%, the Cr content of deposited metal Far below 11% it is difficult to ensure that deposited metal has enough oxidation resistances at 800 DEG C and less than 800 DEG C, for Forming Die During tool built-up welding, high-temperature oxidation resistance is poor;The carbide former that this patent welding rod adds is mainly Cr, the carbide of Cr It is interstitial compound, the fusing point of interstitial compound and hardness, not as the height of gap phase, are also easier during heating to decompose, nitride Form gap phase with some carbides (as carbide of Ti, V, Nb), it is tiny etc. that gap phase has high rigidity, high-melting-point, size Advantage, but this welding rod does not adopt nitride strengthening;In addition, the alloying element that this welding rod plays Grain refinement only has Mo.Award Power notification number CN2507605Y " Mold Surfacing Electrode " utility model patent proposes a kind of flux-cored electrode tubular electrode for mould built-up welding, should Welding rod makees conductive carrier with high-quality seamless steel pipe, and pipe is outer to scribble coating, fills granular alloy medicated core in pipe, and end welding is provided with folder Hold end.This patent is without reference to the Ju Ti Pei Fang of medicated core and coating.Though welding rod has above-mentioned advantage, welding rod is unsuitable for automatically Weldering, built-up welding is less efficient, using few in the built-up welding of large-scale hot-work die.Welding wire can be used for automatic welding, and welding efficiency is high, weldering Connect steady quality, therefore, welding wire is the welding material that large mold built-up welding is commonly used.Welding wire is divided into solid welding wire and flux-cored wire, Deposited metal of dies alloying element content is higher, and the high solid welding wire of alloying element content manufactures difficulty, so mould built-up welding master Flux-cored wire to be used, especially most widely used with the metal powder core solder wire that metal and ferroalloy powder mainly form for medicated powder, metal powder Core soldering wire alloy composition adjustment is easy, it is easy to manufacture, and weld seam no slag, multiple-bead deposit substantially is without scarfing cinder, welding production efficiency Height, also will not produce dreg defect.In recent years, people to research and development, mould built-up welding metal powder core solder wire is heavier regards, such as authorize The patent of invention " tungsten-pole argon arc-welding metal-powder-core weld wire for aged martensite steel and its manufacture method " of notification number CN1093450C is public Open a kind of argon tungsten-arc welding metal powder core solder wire for mould built-up welding, in metal-powder-core, the weight proportion of each powder is: 39-78%Ni, 0-26%Co, 0-18%Mo, 0.2-6%Ti, 0.7-1.68%Al, 0.2-1.455%Nb, 0-0.72%Re, 0-0.15%Te, 0-0.25%Se, 0.02-0.04%B, 0.01-0.02%Zr, 0.01-0.1%Ca, medicated core accounts for the weight of welding wire Amount percentage ratio is 30-52%.Authorization Notice No. is a kind of CN103008924B patent of invention " medicated core for forging mold built-up welding Welding wire and application " discloses a kind of flux-cored wire for forging mold, and welding wire adopts carbon steel steel band to wrap up medicated core powder, Flux-cored wire filling rate is 30%~37%, and medicated core powder includes the material of following weight/mass percentage composition:Calcium fluoride 4%~7%, Soda 0.5%~3%, quartz 0.5%~4%, rutile 2%~6%, high carbon ferro-chrome 13.6%~27.2%, pure chromium powder 13.9%~19.2%, nikel powder 2.2%~5.7%, electrolytic manganese 1.8%~4.3%, molybdenum-iron powder 6.3%~13.2%, ferrosilicon powder 2.1%~5.0%, vanadium iron powder 0.6%~1.9%;Balance of reduced iron powder.Application No. 201410748560.5 patent of invention Flux-cored wire disclosed in " a kind of hot forged mould Gas Shielded welding flux-cored wire " adopts Cr-Ni-Mo-W-V-Co alloy System, using CO2Gas shielded arc welding, adds Co to improve oxidative resistance, red hardness, anti-wear performance, but cost significantly improves.
Deposited metal high-temperature oxidation resistance is excellent, wearability is good, cleanliness factor is high, have the built-up welding of good fatigue resistance energy Metal flux-cored wire is Making mold and the large-scale heat repairing displacement difficulty during the welding material, particularly built-up welding remanufacturing urgent need Make mould and be even more the flux-cored wire being badly in need of all-position welding excellent performance.The performance of such flux-cored wire of China is gone back with external at present There is larger gap.Research and development hot-work die flux-cored welding wire for overlaying welding is significant for improving the hot-work die life-span.
Content of the invention
For the deficiencies in the prior art, the present invention provides a kind of martensitic matrix by the optimization design of alloy powder formula Mould flux-cored wire special, by adding nano chromium nitride powder and yittrium oxide in iron(-)base powder, make deposited metal The technical requirements such as hot-work die high-temperature oxidation resistance, high-wearing feature, high-cleanness, high, anti-fatigue performance can be met simultaneously.
Although existing deposited metal be iron-based flux-cored wire the aspects such as hardness, compactness, bond strength with Ni-based Flux-cored wire about the same, but the toughness of iron-based deposited metal be less than Ni-based it is difficult to meet the requirement of high tenacity.Rich argon The molten bath existence time of the arc weldings such as the gas metal-arc welding of body protection is short, is not filled using its metallurgical reaction of micron powder Divide it is difficult to form enough nitride, carbide hard phase.Therefore, in the present invention by add nano chromium nitride powder Lai Improve its toughness and cracking resistance so as to hot-work die high tenacity and the standard requirement of cracking resistance can be reached.Meanwhile, nanometer Level powder activity is big, metallurgical reaction acutely, make up the drawbacks of arc welding molten bath existence time is short, metallurgical reaction is insufficient so as to It is suitable to the arc welding methods such as argon-rich gas shielded gas metal-arc welding, submerged-arc welding.
Wherein, described " hot-work die " is primarily referred to as hammering mould, hot top forging mould, hot-extrusion mold, hot blanking die Tool, finish forge mould or die casting etc..
Concrete technical scheme is as follows:
A kind of be exclusively used in hot-work die repair built-up welding thin diameter flux wire, include welding wire tube wall be wrapped in its interior medicine Powder;Described medicinal powder package contains deoxidizing alloy and slag former, and described slag former accounts for the 8-10% of medicated powder gross mass, described deoxygenated alloy Agent prescription is as follows in terms of mass parts:Electrolytic manganese 4-8,45# ferrosilicon 2-6, ferrotianium 1-4, chromium carbide 4-8, graphite 0-5, vanadium iron 2-6, Molybdenum-iron 12-18, tungsten powder 2-4, nikel powder 4-8, nano silicon nitride chromium powder 1-2, aoxidize yttrium powder 2-6;The formula of slag former is in terms of mass parts As follows:Rutile 5-8, potassium feldspar 2-3, potassium fluosilicate 2-3, Fluorspar Powder 1-3.
Deposited metal containing nano silicon nitride chromium powder has excellent high temperature hardness, anti-wear performance, and good toughness And cracking resistance, therefore, nano silicon nitride chromium powder is preferably as the basic material of the hardfacing alloy powder for forming hot-work die Use.
Wherein, when the content of nano silicon nitride chromium powder is less than 1 mass parts, high temperature hardness, anti-wear performance, toughness and crack resistance Can be bad.On the other hand, if the content of nano silicon nitride chromium powder is higher than 2 mass parts, deposited metal is also easy to produce gas hole defect, cost Also raise.The present invention has been acknowledged by following result:If the content of nano silicon nitride chromium powder is not less than 1 mass parts and is less than 2 matter During amount part, high temperature hardness, anti-wear performance, toughness and the cracking resistance of expectation can be obtained.
Oxidation yttrium element is as in addition to metal and ferroalloy, nanometer chrome nitride, slag former and inevitable impurity Remaining point and the metal-oxide that comprises, it plays and purifies deposited metal, nodularization field trash, promotes to be formed nitride gap phase, Improve the effect of the anti-fatigue performance of deposited metal.For its content, although cannot treat different things as the same, when the content of yittrium oxide During less than 2 mass parts, may result in yittrium oxide and purify and anti-fatigue performance decreased effectiveness.
On the other hand, when the content of yittrium oxide is higher than 6 mass parts, may result in high temperature hardness and wear resistance decrease, Therefore, in the application, the addition of yittrium oxide is limited to below 6 mass parts, thus without generation the problems referred to above.
Preferably, described deoxygenated alloy agent prescription is as follows in terms of mass parts:Electrolytic manganese 5-8,45# ferrosilicon 3-6, ferrotianium 2-4, Chromium carbide 6-8, graphite 2-5, vanadium iron 3-6, molybdenum-iron 14-18, tungsten powder 2.5-4, nikel powder 5-8, nano silicon nitride chromium powder 1.2-2, oxidation Yttrium powder 3-6;The formula of slag former is as follows in terms of mass parts:Rutile 6-8, potassium feldspar 2.4-3, potassium fluosilicate 2.4-3, Fluorspar Powder 1.5-3.
Preferably, described deoxygenated alloy agent prescription is as follows in terms of mass parts:Electrolytic manganese 5-7,45# ferrosilicon 3-5, ferrotianium 2-3, Chromium carbide 6-7, graphite 2-4, vanadium iron 3-5, molybdenum-iron 14-16, tungsten powder 2.5-3.5, nikel powder 5-7, nano silicon nitride chromium powder 1.2-1.6, Oxidation yttrium powder 3-5;The formula of slag former is as follows in terms of mass parts:Rutile 6-7, potassium feldspar 2.4-2.8, potassium fluosilicate 2.4- 2.8, Fluorspar Powder 1.5-2.5.
Mn content is not less than 99.5% to the composition of described electrolytic manganese by quality ratio;The composition of 45# ferrosilicon is by quality ratio It is 40.0%~47.0%Si, 0.1%C, balance of Fe and the impurity not affecting performance;The composition of ferrotianium is by quality ratio 23%~35%Ti, 8.5%Al, 5%Si, 2.5%Mn, balance of Fe and the impurity not affecting performance;The composition of chromium carbide with Mass ratio meter Cr is not less than 85%, C and is not more than 0.3%, S less than 0.02%, P less than 0.02% for 12%~14%, Si, Fe is less than 0.5%, the balance of impurity not affecting performance;The composition of graphite is 94%~99%C by quality ratio;Vanadium iron Composition is 50%V, 0.2%C, 2%Si, 0.8%Al by quality ratio, balance of Fe and the impurity not affecting performance;Molybdenum-iron Composition is 50%Mo, 3%Si by quality ratio, balance of Fe and the impurity not affecting performance;The composition of tungsten powder W by quality ratio Content is not less than 98%;Ni content is not less than 98% to the composition of metal nickel powder by quality ratio;The composition of yttrium oxide powder is with matter Amount percentages Y2O3Content is not less than 99%;The composition of potassium feldspar is 62-72%SiO by percentage to the quality2, 17-24% Al2O3, K2O+Na2O is not less than 12%, K2O is not less than 8%, S and is less than 0.04%, P less than 0.04%.The composition of rutile TiO by percentage to the quality2Content is not less than 92%;The composition of potassium fluosilicate K by percentage to the quality2SiF4Content is not less than 98%;The composition of Fluorspar Powder CaF by percentage to the quality2Content is not less than 95%.The granularity of above-mentioned powder is 75 microns~180 Micron (i.e. granularity is -80 mesh~+200 mesh).CrN content is not less than 99% to the composition of nano silicon nitride chromium powder by quality ratio, grain Degree more than 99% less than 100 nanometers.Allow in the composition of above-mentioned medicated powder not affect it containing be difficult in the course of processing to remove The impurity of performance.
In the present invention, the addition of nano chromium nitride powder, tiny nitride gap phase can be formed in deposited metal, Utilize nano chromium nitride powder crystal grain thinning (granularity of nano chromium nitride powder is less than 100 nanometers) simultaneously, improve deposited metal High temperature hardness, anti-wear performance, and make it have good toughness, cracking resistance and anti-fatigue performance, nanoscale nitrogenizes chromium powder End activity is big, and metallurgical reaction acutely, can make up the drawbacks of arc surfacing molten bath existence time is short, metallurgical reaction is insufficient, fits In the arc surfacing technique such as argon-rich gas shielded gas metal-arc welding, submerged-arc welding;On the other hand, in order to meet built-up welding gold Belong to high-cleanness, high, the requirement of anti-fatigue performance, by adding oxidation yttrium element in alloy powder, purify deposited metal, nodularization Field trash, promote formed nitride strengthening phase, improve deposited metal anti-fatigue performance.Designed by rational alloy system, make Deposited metal obtains martensitic matrix tissue plus a small amount of retained austenite tissue, and using nitride, carbide as hardening constituent;Logical Cross Metallurgical processing and raw material is preferred, reduce the impurity content such as deposited metal S, P, and improve processing performance.
For the iron(-)base powder of the present invention, it includes at least following alloying element:C、N、Si、Mn、Cr、Mo、V、 Ti、Ni、W.When containing above-mentioned alloying element in iron(-)base powder, the deposited metal of preparation have certain high temperature hardness and Corrosion resistance, ensure that chromium nitride and the maximization of yittrium oxide reinforced effects.
The medicated powder of thin diameter flux wire can also be using being combined with the former of other metal powders than that described above or alloyed powder Feed powder end forms.Now, be premised on the feature not destroying the present invention.
In the present invention, the medicated powder of flux-cored wire special is mixed for the powder such as chromium nitride, vanadium iron, ferrosilicon, ferrotianium, in order to Reduce welding material cost, reduce spatter, improve arc stability, improve appearance of weld, be preferably added a certain amount of Slag former,
Wherein, rutile, potassium feldspar, potassium fluosilicate, Fluorspar Powder, as slag former, play slag making, stablize electric arc, reduce and fly The effect splashed, makes the effect that deposited metal surface quality is lifted further.During use, rutile to be made, potassium feldspar, fluorine silicon Sour potassium, Fluorspar Powder content in described scope.When the total content of rutile, potassium feldspar, potassium fluosilicate, Fluorspar Powder is less than 10 matter During amount part, its slag making, the effect stablize electric arc, reduce splashing, improve deposited metal surface forming are inconspicuous.On the other hand, such as When fruit rutile, potassium feldspar, potassium fluosilicate, the total content of Fluorspar Powder are higher than 17 mass parts, stabilising arc, do not reduce the effect splashed also not Further improve, and relatively reduce the addition of alloying element.Have been acknowledged by following result:Make rutile, potassium feldspar, fluorine Potassium silicate, fluorite powder content in the scope more than 10 mass parts and below 17 mass parts, can obtain good stabilising arc, fall respectively Low spatter, improve the effect of deposited metal molding.
For the hardfacing alloy powder of the present invention, preferably described electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, graphite, vanadium Ferrum, molybdenum-iron, tungsten powder, nikel powder, oxidation yttrium powder, rutile, the granularity of potassium feldspar, potassium fluosilicate and Fluorspar Powder be 75 microns~ 180 microns.(i.e. granularity is -80 mesh~+200 mesh).
Preferably, when the alloy powder of the present invention is used for processing hot die steel, (carbon mass fraction is generally less than 0.5%, the alloying element being commonly incorporated into has:Cr, Mn, W, Mo, V, Si, Ni, Nb, Al etc.), typically, since adding in cladding layer Add Cr, the element such as Ni, Mo, galvanic element can be formed therefore between cladding layer and base material, thus there is electrochemical corrosion, but by All with the addition of Cr in hot-work die itself and cladding powder, the element such as Ni, Mo and make electrochemical reaction be difficult to Fast Persistence Carry out.First, Cr can be dissolved in Ni in the alloy thus forming Ni-Cr solid solution, and plays significant passivation;Secondly, In corrosion process, Cr part replaces the Fe in rusty scale alpha-feooh, defines oxyhydroxide α-(Fe1-xCrx) OOH.Due to This rusty scale microstructure is comparatively dense and relatively stable, can isolate matrix material well with corrosive medium, simultaneously its pole High impedance can reduce the speed of electrochemical reaction again well.And Mo can crystal grain thinning, solution strengthening, formation in steel Cured layer, this cured layer and matrix are firmly combined with, and form passivation, thus have good protective value.Simultaneously because In laser cladding process, laser beam is short with the interaction time of powder, therefore has larger cooling in rapidly cooling procedure Degree, and the alloying element in powder can form multiple compounds, increases the quantity of non-spontaneous forming core further, greatly improves forming core Rate, finally makes the fine microstructures of cladding layer fine and close.Fine and closely woven tissue not only reduces the impurity content on unit crystal boundary, and Decrease the component segregation being formed due to quick cooling, thus reducing the impact of the accelerated corrosion because of galvanic effect.Institute , either for corrosion weight loss amount, according further to more scientific corrosion weight loss rate analysis, hot-work die to be all described Comprise Cr, during tri- kinds of elements of Ni, Mo, the sample of cladding layer has more preferable corrosion resistance, and not due to electrochemical corrosion And galvanic effect and accelerate the corrosion of base material.The powder demonstrating the present invention has the decay resistance consistent with base material, very Good meets the design requirement that hot-work die reparation remanufactures.
The cross sectional shape of flux-cored wire is more complicated, more symmetrical, and electric arc is more stable, and the metallurgical reaction of medicated core and protective effect are got over Fully.But it is as the reduction of gage of wire, this difference is gradually reduced.For the flux-cored wire of the present invention, when welding wire is straight Footpath is 1.6mm, when flux-cored wire cross sectional shape is using " O " type, arc stability highest.
In above-mentioned hot-work die flux-cored welding wire for overlaying welding:The tube wall of described flux-cored wire preferably 430 stainless steel belt system Standby.
It is preferred embodiment:It is 0.3~0.35mm that the tube wall of described flux-cored wire selects wall thickness, and width is 10mm's 430 stainless steel belt preparations;Its chemical composition is preferred by percentage to the quality:Cr content be 16-18%, C be not more than 0.12%, Si is not more than 0.75%, Mn no more than 1.0%, S no more than 0.03%, P are not more than 0.04%, Ni no more than 0.6%, balance of Fe and the impurity not affecting performance.
The filling rate of above-mentioned hot-work die flux-cored welding wire for overlaying welding be 25%~35% (filling rate be medicated powder quality and medicine Powder, the ratio of steel band quality sum).
In above-mentioned medicated powder, the effect of each component is as follows:
The effect of electrolytic manganese is component controlling, and manganese metal impurity content is few, beneficial to the purification of deposited metal.
The effect of 45# ferrosilicon is component controlling, combines addition medicated powder, the effect of silicomanganese combined deoxidation with electrolytic manganese Good.
The effect of ferrotianium is deoxidation, and carbide precipitate TiC and nitride TiN, and crystal grain thinning, by fine grain and precipitated phase Two ways strengthens weld seam, improves the hardness of deposited metal.
The effect of chromium carbide is to weld metal transition Cr and C, and Resistance of Weld Metal plays solution strengthening effect, separates out simultaneously Carbide reinforced weld seam, Cr content reaches more than 11% high-temperature oxidation resistance that can also improve deposited metal.
The effect of graphite is to weld seam transition C, controls the suitable C content of weld seam to form carbide it is ensured that the hardness of weld seam.
The effect of vanadium iron is alloying, forms carbide, nitride, crystal grain thinning.
The effect of molybdenum-iron is alloying, crystal grain thinning, solution strengthening, forms carbide, improves the high temperatures of deposited metal Energy and anti-wear performance.
The effect of tungsten powder is alloying, to weld seam transition W, improves high temperature hardness and the wear resistance at elevated temperature of weld metal.
The effect of nikel powder is can to improve stabilization of austenite, slows down transformation of austenite to martensite, increases remaining difficult to understand Family name's scale of construction, improves plasticity, the toughness of deposited metal, and can reduce martensite start temperature Ms point, can reduce heap The residual stress of weldering metal.
The effect of nano silicon nitride chromium powder is to weld seam transition N, forms nitride with nitride forming element Ti, V, Cr etc., Crystal grain thinning, improves high temperature hardness and the structure stability of weld metal;To weld metal transition Cr.Nanometer powder activity is big, Metallurgical reaction is abundant.
The effect of yittrium oxide is to reduce Welding seam inclusion content, makes inclusion balling, purifies weld metal, improves weld seam gold The anti-fatigue performance belonging to;Reduce the surface tension of molten drop, promote the droplet transfer, reduce and splash.
The effect of rutile is slag making, stabilising arc, adjusts the physical property of slag, improves appearance of weld.
The effect of potassium feldspar is to stablize electric arc, reduces and splashes, improves processing performance, slag making.
The effect of potassium fluosilicate is to stablize electric arc, reduces and splashes, and reduces viscosity coefficient of dross, improves processing performance, slag making.
The effect of fluorite is slag making, the fusing point adjusting slag and viscosity, increases the mobility of slag.
The preparation method of hot-work die flux-cored welding wire for overlaying welding of the present invention comprises the following steps:
(1) join powder and weigh medicated powder by the proportioning of medicated powder formula, first by less for proportion graphite, rutile, potassium feldspar, fluorine silicon Sour potassium, Fluorspar Powder are pressed after formula proportion weighs and are mixed, and mix powder 8-10 minute with existing mixed powder machine, obtain slag former mixed powder End;Then by electrolytic manganese, 45# ferrosilicon, ferrotianium, crome metal, high carbon ferro-chrome, vanadium iron, molybdenum-iron, tungsten powder, nikel powder, nanometer chrome nitride The deoxidizing alloys such as powder, oxidation yttrium powder are added in slag former mixed powder as after formula proportion weighing, are further continued for mixed powder 8-10 and divide Clock, obtains medicated powder.
Wherein:Described medicinal powder package contains deoxidizing alloy and slag former, and medicated powder deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 4-8,45# ferrosilicon 2-6, ferrotianium 1-4, chromium carbide 4-8, graphite 0-5, vanadium iron 2-6, molybdenum-iron 12-18, tungsten powder 2-4, nikel powder 4-8, nano silicon nitride chromium powder 1-2, aoxidize yttrium powder 2-6;The formula of slag former is as follows in terms of mass parts:Rutile 5-8, potassium feldspar 2- 3, potassium fluosilicate 2-3, Fluorspar Powder 1-3.Slag former is the 8-10% of medicated powder quality.The granularity of nano silicon nitride chromium powder is more than 99% Less than 100 nanometers, the granularity of other powder is 75 microns~180 microns (i.e. granularity is -80 mesh~+200 mesh);
(2) after cleaning 10 mm wides, 0.3~0.35 millimeters thick 430 stainless steel belt with ultrasonic cleaning apparatus, with now Some flux-cored wire production equipments, above-mentioned steel band are rolled into U-shaped, then the medicated powder made to addition step (1) in U-shaped grain, fill out Filling rate (ratio of medicated powder quality and flux-cored wire quality) is 25~35%;
(3) U-lag is healed up, so that medicated powder is wrapped up wherein, the position that heals up is using docking connected mode;Touched by wire drawing, by Road drawing, tube reducing, finally make its diameter reach 1.6mm.
(4) the flux-cored wire layer of step (3) gained is coiled into disk, obtains final product hot-work die flux-cored welding wire for overlaying welding finished product.
For the flux-cored wire of the present invention, when the gas flow that MAG welds gas is less than 18L/min, protective gas Deflection is not enough, and weld seam easily produces the defects such as pore;When gas flow is more than 20L/min, not only waste gas, and oxidisability Strengthen, face of weld can form one layer of dimmed oxide skin, so that weldquality is declined, be possible to produce turbulent flow reduction simultaneously Protected effect.Therefore, in the present invention, preferred gas flow is 18L/min-20L/min.
Arc voltage and welding current are the main technologic parameters that MAG welds, and arc voltage is crucial ginseng during short circuiting transfer Number, arc voltage is matched with welding current, it is possible to obtain little, the good stabilized welding process of appearance of weld of splashing.The present invention In preferably welding current 300A-320A;Voltage 28V-31V.
Because short circuiting transfer is all using thin welding wire, so produced resistance heat is to welding effect shadow in electrode extension Sound is very big.Extension elongation increases, and the resistance heat on welding wire increases, and wire melting is accelerated, and productivity ratio improves.But with regard to the present invention Speech, when extension elongation is more than 18mm, welding wire is susceptible to the overheated section that forms and fuses, and splashes serious, welding process is unstable.Simultaneously After stretching out increase, the distance between nozzle and weldment also increases, and leads to gas shield effect to be deteriorated.But extension elongation is less than 14mm When, the distance between nozzle and weldment is too short, the easy plug nozzle of splashing metal.Therefore, in the present invention, preferred welding wire stretches out and leads The length of sparking plug is 14mm-18mm.Above-mentioned hot-work die flux-cored welding wire for overlaying welding adopts full-argon gas shielded arc welding, welding current 300-320A;Voltage 28-31V;Gas flow rate 18-20L/min;Welding wire stretches out length 14-18mm of ignition tip.The welding of welding wire Processing performance is good, and arc stability, the little, crack resistance of splashing are good.The hardness of deposited metal is HRC42-55.
The application of the flux-cored wire of the present invention is not limited to gas shielded arc welding it can also be used to submerged-arc welding, electroslag welding etc..
The remarkable result that the present invention has is:
(1) this patent flux-cored wire is the thin diameter flux wire of diameter 1.6mm, can be welded using current common apparatus, Save equipment investment;Flux-cored wire has good processing performance, is suitable to automatic welding, welding production efficiency high.By in weld seam Surface forms the thin layer slag that a layer thickness is less than 0.3mm, is evenly distributed, and improves appearance of weld, is also suitably for all position welding Connect.Can be used for conjugating the difficult manufacture of large-scale hot-work die and reparation during built-up welding.
(2) composition of deposited metal can be by changing the composition adjustment of flux-cored wire medicated powder, it is possible to produce series is produced Product are used for different hot die steels, applied range.
(3) this patent flux-cored wire optimizes deposited metal chrome content, makes deposited metal have good high-temperature oxidation resistant Performance, significantly improves the service life of hot-work die.
(4) this patent flux-cored wire passes through to add nano silicon nitride chromium powder and nitride forming element in medicated powder, by anti- Answer fabricated in situ nitride, as gap phase, nitride has the advantages that size is tiny, high-temperature stable, significantly improve built-up welding gold The high temperature hardness belonging to and high-temperature stability.
(5) this patent passes through preferred (such as the selecting simple metal, use ferroalloy less) of steel band and medicated powder raw material and adds dilute Soil, reduces deposited metal inclusion content, makes inclusion balling, crystal grain thinning, improve the toughness of deposited metal, plasticity and Anti-fatigue performance.
Specific embodiment
Embodiment 1:
(1) join powder by medicated powder formula proportioning weigh medicated powder, first by less for proportion rutile, potassium feldspar, potassium fluosilicate, Fluorspar Powder is pressed after formula proportion weighs and is mixed, and mixes powder 8 minutes with existing mixed powder machine, obtains slag former mixed-powder;Then will The deoxygenations such as electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, vanadium iron, molybdenum-iron, tungsten powder, nikel powder, nano silicon nitride chromium powder, oxidation yttrium powder Golden agent is added in slag former mixed powder as after formula proportion weighing, is further continued for mixed powder 8 minutes, obtains medicated powder.
Wherein:Described medicinal powder package contains deoxidizing alloy and slag former, and medicated powder deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 4,45# ferrosilicon 3, ferrotianium 2, chromium carbide 4, vanadium iron 2, molybdenum-iron 12, tungsten powder 2, nikel powder 4, nano silicon nitride chromium powder 1, yittrium oxide Powder 2;The formula of slag former is as follows in terms of mass parts:Rutile 8, potassium feldspar 2, potassium fluosilicate 2, Fluorspar Powder 2.Slag former is medicated powder The 10% of quality.The granularity of nano silicon nitride chromium powder is more than 99% less than 100 nanometers, the granularity of other powder is 75 microns~ 180 microns (i.e. granularity is -80 mesh~+200 mesh);
(2) after cleaning thick to wide for 10mm, 0.3mm 430 stainless steel belts with ultrasonic cleaning apparatus, with the weldering of existing medicated core Silk production equipment, above-mentioned steel band is rolled into U-shaped, then the medicated powder made to addition step (1) in U-shaped grain, filling rate (medicated powder matter Amount and the ratio of flux-cored wire quality) it is 35%;
(3) U-lag is healed up, so that medicated powder is wrapped up wherein, the position that heals up is using docking connected mode;Touched by wire drawing, by Road drawing, tube reducing, finally make its diameter reach 1.6mm.
(4) the flux-cored wire layer of step (3) gained is coiled into disk, obtains final product hot-work die flux-cored welding wire for overlaying welding finished product.
Above-mentioned hot-work die flux-cored welding wire for overlaying welding adopts argon-rich gas Ar+1%CO2The consumable electrode gas-arc of protection Weldering, welding current 300A-320A;Voltage 28V-31V;Gas flow rate 18L/min;Electrode extension 14mm.The welding of welding wire Processing performance is good, and arc stability, the little, crack resistance of splashing are good.The hardness of deposited metal is HRC42.
Embodiment 2:
(1) join powder and weigh medicated powder by the proportioning of medicated powder formula, first by less for proportion graphite, rutile, potassium feldspar, fluorine silicon Sour potassium, Fluorspar Powder are pressed after formula proportion weighs and are mixed, and mix powder 10 minutes with existing mixed powder machine, obtain non-alloyed mixed powder;So Afterwards will be de- to electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, vanadium iron, molybdenum-iron, tungsten powder, nikel powder, nano silicon nitride chromium powder, oxidation yttrium powder etc. Oxygen alloy agent is added in non-alloyed mixed powder as after formula proportion weighing, is further continued for mixed powder 8 minutes, obtains medicated powder.
Wherein:Described medicinal powder package contains deoxidizing alloy and slag former, and medicated powder deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 8,45# ferrosilicon 6, ferrotianium 4, chromium carbide 8, graphite 3, vanadium iron 6, molybdenum-iron 18, tungsten powder 4, nikel powder 5, nano silicon nitride chromium powder 2, Oxidation yttrium powder 6;The formula of slag former is as follows in terms of mass parts:Rutile 5, potassium feldspar 1, potassium fluosilicate 3, Fluorspar Powder 1.Slag former For medicated powder quality 8%.The granularity of nano silicon nitride chromium powder is more than 99% less than 100 nanometers, and the granularity of other powder is 75 Micron~180 microns (i.e. granularity is -80 mesh~+200 mesh);
(2) after cleaning thick to wide for 10mm, 0.3mm 430 stainless steel belts with ultrasonic cleaning apparatus, with the weldering of existing medicated core Silk production equipment, above-mentioned steel band is rolled into U-shaped, then the medicated powder made to addition step (1) in U-shaped grain, filling rate (medicated powder matter Amount and the ratio of flux-cored wire quality) it is 35%;
(3) U-lag is healed up, so that medicated powder is wrapped up wherein, the position that heals up is using docking connected mode;Touched by wire drawing, by Road drawing, tube reducing, finally make its diameter reach 1.6mm.
(4) the flux-cored wire layer of step (3) gained is coiled into disk, obtains final product hot-work die flux-cored welding wire for overlaying welding finished product.
Above-mentioned hot-work die flux-cored welding wire for overlaying welding is using using argon-rich gas Ar+1%CO2The consumable electrode gas of protection is protected Shield weldering, welding current 300A-320A;Voltage 28V-31V;Gas flow rate 20L/min;Electrode extension 18mm.The weldering of welding wire Connect processing performance good, arc stability, the little, crack resistance of splashing are good.The hardness of deposited metal is HRC52.Embodiment 3:
(1) join powder and weigh medicated powder by the proportioning of medicated powder formula, first by less for proportion graphite, rutile, potassium feldspar, fluorine silicon Sour potassium, Fluorspar Powder are pressed after formula proportion weighs and are mixed, and mix powder 9 minutes with existing mixed powder machine, obtain non-alloyed mixed powder;Then By deoxidations such as electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, vanadium iron, molybdenum-iron, tungsten powder, nikel powder, nano silicon nitride chromium powder, oxidation yttrium powders Alloying constituent is added in non-alloyed mixed powder as after formula proportion weighing, is further continued for mixed powder 9 minutes, obtains medicated powder.
Wherein:Described medicinal powder package contains deoxidizing alloy and slag former, and medicated powder deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 6,45# ferrosilicon 4, ferrotianium 3, chromium carbide 6, graphite 3, vanadium iron 4, molybdenum-iron 15, tungsten powder 3, nikel powder 6, nano silicon nitride chromium powder 1, Oxidation yttrium powder 4;The formula of slag former is as follows in terms of mass parts:Rutile 7, potassium feldspar 2, potassium fluosilicate 3, Fluorspar Powder 2.Slag former For medicated powder quality 10%.The granularity of nano silicon nitride chromium powder is more than 99% less than 100 nanometers, and the granularity of other powder is 75 Micron~180 microns (i.e. granularity is -80 mesh~+200 mesh);
(2), after thick to wide for 10mm, 0.35mm 430 stainless steel belts being cleaned with ultrasonic cleaning apparatus, use existing medicated core Welding wire production equipment, above-mentioned steel band is rolled into U-shaped, then the medicated powder made to addition step (1) in U-shaped grain, filling rate (medicated powder Quality and the ratio of flux-cored wire quality) it is 30%;
(3) U-lag is healed up, so that medicated powder is wrapped up wherein, the position that heals up is using docking connected mode;Touched by wire drawing, by Road drawing, tube reducing, finally make its diameter reach 1.6mm.
(4) the flux-cored wire layer of step (3) gained is coiled into disk, obtains final product hot-work die flux-cored welding wire for overlaying welding finished product.
Above-mentioned hot-work die flux-cored welding wire for overlaying welding adopts argon-rich gas Ar+1.5%CO2The consumable electrode gas-arc of protection Weldering, welding current 300A-320A;Voltage 28V-31V;Gas flow rate 18L/min;Welding wire stretches out length 14mm of ignition tip.Weldering The welding technological properties of silk is good, and arc stability, the little, crack resistance of splashing are good.The hardness of deposited metal is HRC48.
Embodiment 4:
(1) join powder and weigh medicated powder by the proportioning of medicated powder formula, first by less for proportion graphite, rutile, potassium feldspar, fluorine silicon Sour potassium, Fluorspar Powder are pressed after formula proportion weighs and are mixed, and mix powder 8 minutes with existing mixed powder machine, obtain non-alloyed mixed powder;Then By deoxidations such as electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, vanadium iron, molybdenum-iron, tungsten powder, nikel powder, nano silicon nitride chromium powder, oxidation yttrium powders Alloying constituent is added in non-alloyed mixed powder as after formula proportion weighing, is further continued for mixed powder 8 minutes, obtains medicated powder.
Wherein:Described medicinal powder package contains deoxidizing alloy and slag former, and medicated powder deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 4,45# ferrosilicon 3, ferrotianium 4, chromium carbide 8, graphite 2, vanadium iron 6, molybdenum-iron 12, tungsten powder 4, nikel powder 4, nano silicon nitride chromium powder 2, Oxidation yttrium powder 6;The formula of slag former is as follows in terms of mass parts:Rutile 6, potassium feldspar 3, potassium fluosilicate 2, Fluorspar Powder 1.Slag former For medicated powder quality 8%.The granularity of nano silicon nitride chromium powder is more than 99% less than 100 nanometers, and the granularity of other powder is 75 Micron~180 microns (i.e. granularity is -80 mesh~+200 mesh);
(2) after cleaning thick to wide for 10mm, 0.3mm 430 stainless steel belts with ultrasonic cleaning apparatus, with the weldering of existing medicated core Silk production equipment, above-mentioned steel band is rolled into U-shaped, then the medicated powder made to addition step (1) in U-shaped grain, filling rate (medicated powder matter Amount and the ratio of flux-cored wire quality) it is 35%;
(3) U-lag is healed up, so that medicated powder is wrapped up wherein, the position that heals up is using docking connected mode;Touched by wire drawing, by Road drawing, tube reducing, finally make its diameter reach 1.6mm.
(4) the flux-cored wire layer of step (3) gained is coiled into disk, obtains final product hot-work die flux-cored welding wire for overlaying welding finished product.
Above-mentioned hot-work die flux-cored welding wire for overlaying welding adopts argon-rich gas Ar+1.5%CO2The consumable electrode gas-arc of protection Weldering, welding current 300A-320A;Voltage 28V-31V;Gas flow rate 16L/min;Electrode extension 16mm.The welding of welding wire Processing performance is good, and arc stability, the little, crack resistance of splashing are good.The hardness of deposited metal is HRC55.
Comparative example 1
This comparative example is with the difference of embodiment 1, does not contain yittrium oxide in composition of raw materials, tired to the heat of deposited metal Labor is tested, and specimen size is 50 × 20 × 1.5 (mm), in the center vertical thickness direction of 20mm, opens 60 ° of V-types Breach, carries out 700 DEG C -20 DEG C of circulating-heating, cooling, with the cycle-index reflection fatigue behaviour of 0.5mm crackle.Do not contain The cycle-index of the comparative example 1 of yttrium oxide powder is 21 times, and the cycle-index of the embodiment 1 containing yittrium oxide 2 parts (quality) is 43 Secondary.By with the comparing of embodiment 1, show that yittrium oxide of the present invention can effectively lift the anti-fatigue performance of deposited metal.
Comparative example 2
This comparative example is with the difference of embodiment 1, is added without nano silicon nitride chromium powder in composition of raw materials, to toughness and The carrying out of cracking resistance is tested, and is not added with the comparative example 2 of nano silicon nitride chromium powder, the test value of U-shaped notch impact toughness is 1.06J/ cm2, in the 5CrNiMo mould steel surface overlaying for 80mm for the thickness, preheat 250 DEG C and just can occur without crackle;Embodiment 1 U-shaped The test value of notch impact toughness is 1.21J/cm2, in the 5CrNiMo mould steel surface overlaying for 80mm for the thickness, preheat 50 DEG C Crackle can be occurred without.Show that the nano silicon nitride chromium powder in medicated core of the present invention can effectively improve toughness and the cracking resistance of deposited metal Performance.
Comparative example 3
This comparative example is with the difference of embodiment 1, adopts granularity to be 75 microns~180 microns in composition of raw materials The nitridation chromium powder of (i.e. granularity is -80 mesh~+200 mesh), the hardness of 500 DEG C of actual measurement is HRC36, the maxima and minima of hardness Difference HRC6;500 DEG C of hardness of embodiment 1 are HRC41, the maxima and minima difference HRC4 of hardness.Nanometer chrome nitride makes Keep higher hardness under deposited metal high temperature, and the hardness of deposited metal is more uniform.Micron-sized chromium nitride is larger due to granule, Activity is less, because welding pool rate of cooling is fast under existing addition, leads to metallurgical reaction insufficient it is impossible to effectively carry The high temperature hardness of high deposited metal and structure stability.
Although the above-mentioned specific embodiment to the present invention is described, not the limit to the scope of the present invention System, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art do not need to pay Go out the various modifications that creative work can make or deformation still within protection scope of the present invention.

Claims (10)

1. a kind of hot-work die that is exclusively used in repairs the thin diameter flux wire of built-up welding it is characterised in that including welding wire tube wall and being wrapped in Its interior medicated powder;Described medicinal powder package contains deoxidizing alloy and slag former, and described slag former accounts for the 8-10% of medicated powder gross mass, described Deoxygenated alloy agent prescription is as follows in terms of mass parts:Electrolytic manganese 4-8,45# ferrosilicon 2-6, ferrotianium 1-4, chromium carbide 4-8, graphite 0-5, Vanadium iron 2-6, molybdenum-iron 12-18, tungsten powder 2-4, nikel powder 4-8, nano silicon nitride chromium powder 1-2, aoxidize yttrium powder 2-6;The formula of slag former with Mass parts meter is as follows:Rutile 5-8, potassium feldspar 2-3, potassium fluosilicate 2-3, Fluorspar Powder 1-3.
2. flux-cored wire as claimed in claim 1 is it is characterised in that described deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 5-8,45# ferrosilicon 3-6, ferrotianium 2-4, chromium carbide 6-8, graphite 2-5, vanadium iron 3-6, molybdenum-iron 14-18, tungsten powder 2.5-4, nickel Powder 5-8, nano silicon nitride chromium powder 1.2-2, aoxidize yttrium powder 3-6;The formula of slag former is as follows in terms of mass parts:Rutile 6-8, potassium is long Stone 2.4-3, potassium fluosilicate 2.4-3, Fluorspar Powder 1.5-3.
3. flux-cored wire as claimed in claim 1 or 2 it is characterised in that described deoxygenated alloy agent prescription in terms of mass parts as Under:Electrolytic manganese 5-7,45# ferrosilicon 3-5, ferrotianium 2-3, chromium carbide 6-7, graphite 2-4, vanadium iron 3-5, molybdenum-iron 14-16, tungsten powder 2.5- 3.5, nikel powder 5-7, nano silicon nitride chromium powder 1.2-1.6, aoxidize yttrium powder 3-5;The formula of slag former is as follows in terms of mass parts:Rutile 6-7, potassium feldspar 2.4-2.8, potassium fluosilicate 2.4-2.8, Fluorspar Powder 1.5-2.5.
4. flux-cored wire as claimed in claim 1 or 2 it is characterised in that the composition of described electrolytic manganese Mn contains by quality ratio Amount is not less than 99.5%;The composition of 45# ferrosilicon is 40.0%~47.0%Si, 0.1%C by quality ratio, balance of Fe and not The impurity of impact performance;The composition of ferrotianium is 23%~35%Ti by quality ratio, 8.5%Al, 5%Si, 2.5%Mn, surplus For Fe with the impurity that do not affect performance;Cr is not less than 85%, C for 12%~14%, Si not to the composition of chromium carbide by quality ratio It is less than 0.02%, P more than 0.3%, S and be less than 0.02%, Fe less than 0.5%, the balance of impurity not affecting performance;Vanadium The composition of ferrum is 50%V, 0.2%C, 2%Si, 0.8%Al by quality ratio, balance of Fe and the impurity not affecting performance;Molybdenum The composition of ferrum is 50%Mo, 3%Si by quality ratio, balance of Fe and the impurity not affecting performance;The composition of tungsten powder is with quality It is not less than 98% than meter W content;Ni content is not less than 98% to the composition of metal nickel powder by quality ratio;Oxidation yttrium powder composition with Mass percent Y2O3Content is not less than 99%;The composition of potassium feldspar is 62%SiO by percentage to the quality2, 17%Al2O3, K2O+Na2O is not less than 12%, K2O is not less than 8%, S and is less than 0.04%, P less than 0.04%;The composition of rutile is with quality Percentages TiO2Content is not less than 92%;The composition of potassium fluosilicate K by percentage to the quality2SiF4Content is not less than 98%;Firefly The composition of stone powder CaF by percentage to the quality2Content is not less than 95%.
5. flux-cored wire as claimed in claim 1 or 2 is it is characterised in that the granularity of described nano silicon nitride chromium powder is received less than 100 Rice, described electrolytic manganese, 45# ferrosilicon, ferrotianium, chromium carbide, vanadium iron, molybdenum-iron, tungsten powder, nikel powder, oxidation yttrium powder, rutile, potassium feldspar, The granularity of potassium fluosilicate and Fluorspar Powder is 75 microns~180 microns.
6. flux-cored wire as claimed in claim 1 is it is characterised in that described welding wire tube wall adopts 430 stainless steel belt preparations.
7. flux-cored wire as claimed in claim 1 it is characterised in that described welding wire tube wall adopt wall thickness be 0.3~0.35mm, Width is the 430 stainless steel belt preparations of 10mm, and its chemical composition is by percentage to the quality:Cr content is for 16-18%, C not It is not more than 0.75%, Mn no more than 1.0% more than 0.12%, Si, S is not more than 0.03%, P no more than 0.04%, Ni is not more than 0.6%th, balance of Fe and the impurity not affecting performance.
8. flux-cored wire as claimed in claim 1 it is characterised in that gage of wire be 1.6mm, the filling of described flux-cored wire Rate is 25%~35%.
9. the argon-rich gas shielded consumable electrode gas protection welding method of the arbitrary described flux-cored wire of claim 1-8, its It is characterised by, technological parameter is as follows:Welding current 300A-320A;Voltage 28V-31V;Gas flow 18L/min-20L/min; Electrode extension 14mm-18mm.
10. application in processing hot die steel for the arbitrary described flux-cored wire of claim 1-8 is it is characterised in that described Cr, Ni, Mo is contained in hot die steel.
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