CN105057926B - A kind of flux-cored wire special that built-up welding is repaired for hot-work die - Google Patents

A kind of flux-cored wire special that built-up welding is repaired for hot-work die Download PDF

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CN105057926B
CN105057926B CN201510608369.5A CN201510608369A CN105057926B CN 105057926 B CN105057926 B CN 105057926B CN 201510608369 A CN201510608369 A CN 201510608369A CN 105057926 B CN105057926 B CN 105057926B
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powder
flux
welding
composition
cored wire
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CN105057926A (en
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孙俊生
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Shandong University
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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
    • B23K35/02Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261Rods, electrodes, wires
    • B23K35/0266Rods, electrodes, wires flux-cored
    • 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
    • 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
    • B23K35/36Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • 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
    • B23K35/36Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/368Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
    • 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
    • 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
    • B23K9/00Arc welding or cutting
    • B23K9/04Welding for other purposes than joining, e.g. built-up welding
    • 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
    • B23K9/00Arc welding or cutting
    • B23K9/16Arc welding or cutting making use of shielding gas
    • B23K9/173Arc welding or cutting making use of shielding gas and of a consumable electrode

Abstract

The invention provides a kind of flux-cored wire special that built-up welding is repaired for hot-work die, including welding wire tube wall and the medicinal powder being wrapped in it;The medicinal powder package contains deoxidizing alloy and slag former.By to nano chromium nitride powder is added in iron(-)base powder, forming tiny nitride gap phase in deposited metal, make deposited metal that there is good toughness and cracking resistance;Meanwhile, yittrium oxide is added in alloy powder, purify deposited metal, nodularization field trash, promote to form nitride strengthening phase, improve the anti-fatigue performance of deposited metal.Argon-rich gas shielded gas metal-arc welding technology is coordinated to repair hot-work die using flux-cored wire, the deposited metal for obtaining has excellent high-temperature oxidation resistance, wearability, cleanliness factor and good fatigue resistance energy.

Description

A kind of flux-cored wire special that built-up welding is repaired for hot-work die
Technical field
The invention belongs to field of welding material, more particularly to a kind of special medicine core weldering that built-up welding is repaired for hot-work die 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 for making roller, hot-forging die, hot extruding die, hot blanking die etc. is increasing, as disappearing for being widely applied in industrial production One of consumable component.Mould fails because the reasons such as abrasion and heat fatigue can produce peeling, scratch, abrasion etc. in use. The service life for how improving it is always the study hotspot of domestic and international concern.The life-span of mould depend primarily on mold materials, Several aspects such as structure design, Technology for Heating Processing, processing.China's die life only has the 1/2-1/3 of foreign countries, there is precision Problem long of low, process-cycle.In view of the failure of mould is mostly by surface, from save energy and resource, giving 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 for extending die life.Method in production frequently with built-up welding prepares alloy-layer on die blank, obtains double Metal die, both reduces cost, and the performance of mould is improve 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 conventional welding material of built-up welding has welding rod and welding wire.Welding rod uses gas slag Combined Protection, and metallurgical quality preferably, can be with By coating and core wire transition alloy elements, weld seam impurity content is few, cleanliness factor is higher, and weld seam has fatigue resistance higher Energy.Welding rod is also relatively adapted to the short weld seam and irregular weld seam operating mode of mould repair using flexible simultaneously.Therefore, welding rod is commonly used In the Bead weld repair of small mould, people have developed various hot-work die surfacing weldings for this, and such as publication No. is The weight hundred of patent " the hot forged mould Bead weld repair and remanufacture use special welding rod " of CN102240872A its chemical composition of coating It is titanium dioxide 1-3, marble 25-40, fluorite 10-15, quartzy 3-5, chalk 2-4, high carbon ferro-chrome 8-12, height to divide than (wt%) 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. The welding rod uses Cr-Ni-Mo alloy systems, and the maximum level of electrode coating medium high carbon ferrochrome is 12%, the Cr contents 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 High-temperature oxidation resistance is poor during tool built-up welding;The carbide former that the patent welding rod is added is mainly Cr, the carbide of Cr It is interstitial compound, the fusing point and hardness of interstitial compound are also easier to decompose not as the height of gap phase, during heating, nitride Gap phase is formed with some carbide (such as carbide of Ti, V, Nb), gap is mutually tiny etc. with high rigidity, high-melting-point, size Advantage, but the welding rod does not use nitride strengthening;In addition, the alloying element that the 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, and the granular alloy medicine core of filling in pipe, end welding is provided with folder Hold end.The patent is without reference to medicine core and the Ju Ti Pei Fang of 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 Steady quality is connect, therefore, welding wire is the conventional welding material of large mold built-up welding.Welding wire is divided into solid welding wire and flux-cored wire, Deposited metal of dies alloying element content is higher, and alloying element content solid welding wire manufacture high is difficult, so mould built-up welding master Use flux-cored wire, especially most widely used with the metal powder core solder wire that metal and ferroalloy powder are mainly constituted as medicinal powder, metal powder Core soldering wire alloy composition adjustment is easy, manufacture is easy, and weld seam is substantially without slag, multiple-bead deposit without scarfing cinder, welding production efficiency Height, will not also 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 A kind of argon tungsten-arc welding metal powder core solder wire for mould built-up welding is opened, the weight proportion of each powder is in metal-powder-core: 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, medicine core account for the weight of welding wire Amount percentage is 30-52%.Almost without slag, appearance of weld is not so good as slag type flux-cored wire, and full position to metal powder core solder wire The adaptability for putting welding is poor, and difficulty is conjugated during for large-scale hot-work die built-up welding is difficult to ensure that surfacing quality.Granted publication Number it is used for for CN103008924B patents of invention " a kind of flux-cored wire and application for forging mold built-up welding " disclose one kind The flux-cored wire of forging mold, welding wire using carbon steel steel band wrap up medicine core powder, flux-cored wire filling rate be 30%~ 37%, medicine core powder includes the material of following weight/mass percentage composition:Calcirm-fluoride 4%~7%, soda ash 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%, nickel 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.A kind of patent of invention of Application No. 201410748560.5 " hot forged mould gas Flux-cored wire disclosed in protection flux-cored wire " uses Cr-Ni-Mo-W-V-Co alloy systems, using CO2Gas shield Weldering, adds Co to improve oxidative resistance, red hardness, anti-wear performance, but cost is significantly improved.
Deposited metal high-temperature oxidation resistance is excellent, wearability is good, cleanliness factor is high, the built-up welding with good fatigue resistance energy Flux-cored wire is that Making mold conjugates difficult large-scale Forming Die with when repairing and remanufacturing the welding material, particularly built-up welding of urgent need Tool is even more the flux-cored wire for being badly in need of all-position welding excellent performance.The performance of such flux-cored wire of current China also exists with foreign countries 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.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of martensitic matrix by the optimization design that alloy powder is formulated Mould flux-cored wire, by iron(-)base powder add nano chromium nitride powder and yttrium oxide powder, make built-up welding Metal can simultaneously meet the technical requirements such as hot-work die high-temperature oxidation resistance, high-wearing feature, high-cleanness, high, anti-fatigue performance.
Although existing deposited metal for iron-based flux-cored wire the aspects such as hardness, compactness, bond strength with it is Ni-based Flux-cored wire it is about the same, but iron-based deposited metal toughness less than Ni-based, it is difficult to meet the requirement of high tenacity.Rich argon gas The molten bath existence time of the arc weldings such as the gas metal-arc welding of body protection is short, and using micron powder, its metallurgical reaction does not fill Point, it is difficult to form enough nitride, carbide hard phase.Therefore, the present invention in by add nano chromium nitride powder come Improve its toughness and cracking resistance, the standard requirement of hot-work die high tenacity and cracking resistance can be reached.Meanwhile, nanometer Level powder activity is big, and metallurgical reaction acutely, makes up the drawbacks of arc welding molten bath existence time is short, metallurgical reaction is insufficient, makes it 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 heading mould, hot-extrusion mold, hot blanking die Tool, finish forge mould or die casting etc..
Concrete technical scheme is as follows:
A kind of flux-cored wire special that built-up welding is repaired for hot-work die, including welding wire tube wall and the medicine being wrapped in it Powder;The medicinal powder package contains deoxidizing alloy and slag former, and the slag former accounts for the 8-10% of medicinal powder gross mass, the deoxygenated alloy Agent prescription is as follows in terms of mass parts:Electrolytic manganese 4-8,45# ferrosilicon 2-6, ferrotianium 1-4, crome metal 20-35, high carbon ferro-chrome 20-30, Graphite 0-5, vanadium iron 2-6, molybdenum-iron 12-18, tungsten powder 2-4, nickel powder 4-8, nano silicon nitride chromium powder 1-2, oxidation yttrium powder 2-6;Slag former Formula it is as follows in terms of mass parts:Rutile 5-8, potassium feldspar 2-3, prodan 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, basic material of the nano silicon nitride chromium powder preferably as 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 no more than 2 matter During amount part, high temperature hardness, the anti-wear performance of expectation, toughness and cracking resistance can be obtained.
Oxidation yttrium element is used as in addition to metal and ferroalloy, nanometer chrome nitride, slag former and inevitable impurity Remaining point and comprising metal oxide, its play purification deposited metal, nodularization field trash, promote to form 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, yittrium oxide purification and anti-fatigue performance decreased effectiveness are may result in.
On the other hand, when the content of yittrium oxide is higher than 6 mass parts, high temperature hardness and wear resistance decrease are may result in, Therefore, the addition of yittrium oxide is limited to below 6 mass parts in the application, therefore above mentioned problem will not be produced.
Preferably, the deoxygenated alloy agent prescription is as follows in terms of mass parts:Electrolytic manganese 5-8,45# ferrosilicon 3-6, ferrotianium 2-4, Crome metal 25-35, high carbon ferro-chrome 24-30, graphite 2-5, vanadium iron 3-6, molybdenum-iron 14-18, tungsten powder 2.5-4, nickel powder 5-8, nanometer nitrogen Change 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, fluorine silicon Sour sodium 2.4-3, Fluorspar Powder 1.5-3.
Preferably, the deoxygenated alloy agent prescription is as follows in terms of mass parts:Electrolytic manganese 5-7,45# ferrosilicon 3-5, ferrotianium 2-3, Crome metal 25-30, high carbon ferro-chrome 24-28, graphite 2-4, vanadium iron 3-5, molybdenum-iron 14-16, tungsten powder 2.5-3.5, nickel powder 5-7, nanometer Nitridation 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, prodan 2.4-2.8, Fluorspar Powder 1.5-2.5.
Mn contents are not less than 99.5% to the composition of the electrolytic manganese by quality ratio;The composition of 45# ferrosilicon is by quality ratio It is 40.0%~47.0%Si, 0.1%C, it is remaining not influence for Fe and the impurity of performance;The composition of ferrotianium is by quality ratio 23% ~35%Ti, 8.5%Al, 5%Si, 2.5%Mn, it is remaining not influence for Fe and the impurity of performance;The composition of crome metal is with mass ratio Meter Cr contents are not less than 98%;Cr is not less than 60%, C for 6%~10%, Si is not more than to the composition of high carbon ferro-chrome by quality ratio 3%, S are no more than 0.04% no more than 0.04%, P, remaining not influence for Fe and the impurity of performance;The composition of graphite is by quality ratio It is 94%~99%C;The composition of vanadium iron is by quality ratio 50%V, 0.2%C, 2%Si, 0.8%Al, remaining for Fe and not influence The impurity of performance;The composition of molybdenum-iron is by quality ratio 50%Mo, 3%Si, remaining not influence for Fe and the impurity of performance;Tungsten powder W content is not less than 98% to composition by quality ratio;Ni contents are not less than 98% to the composition of metal nickel powder by quality ratio;Yittrium oxide The composition of powder Y by percentage to the quality2O3Content is not less than 99%;The composition of potassium feldspar is by percentage to the quality 62-72% SiO2, 17-24%Al2O3, K2O+Na2O is not less than 12%, K2O is no more than 0.04% not less than 8%, S no more than 0.04%, P. The composition of rutile TiO by percentage to the quality2Content is not less than 92%;The composition of prodan is by percentage to the quality Na2SiF4Content is not less than 95%;The composition of Fluorspar Powder CaF by percentage to the quality2Content is not less than 95%.
In the present invention, the addition of nano chromium nitride powder can form tiny nitride gap phase in deposited metal, Simultaneously using nano chromium nitride powder crystal grain thinning (granularity of nano chromium nitride powder is less than 100 nanometers), deposited metal is improved High temperature hardness, anti-wear performance, and make it have good toughness, cracking resistance and anti-fatigue performance, nanoscale nitridation chromium powder Last 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 Category high-cleanness, high, the requirement of anti-fatigue performance, by adding oxidation yttrium element, purification deposited metal, nodularization in alloy powder Field trash, promote to be formed nitride strengthening phase, improve the anti-fatigue performance of deposited metal.Designed by rational alloy system, made Deposited metal obtains martensitic matrix tissue and adds a small amount of retained austenite to organize, and using nitride, carbide as hardening constituent;It is logical Cross Metallurgical processing and raw material preferably, reduce the impurity contents such as deposited metal S, P, and improve processing performance.
For iron(-)base powder of the invention, it comprises at least following alloying element:C、N、Si、Mn、Cr、Mo、V、 Ti、Ni、W.When above-mentioned alloying element is contained in iron(-)base powder, the deposited metal of preparation have certain high temperature hardness and Corrosion resistance, ensure that the maximization of chromium nitride and yittrium oxide enhancing effect.
The medicinal powder of flux-cored wire special can also use the original for being combined with other metal powders or alloyed powder than that described above Feed powder end forms.Now, be not destroy premised on feature of the invention.
The medicinal powder of flux-cored wire special is that the powder such as chromium nitride, vanadium iron, ferrosilicon, ferrotianium are mixed in the present invention, in order to Welding material cost is reduced, spatter is reduced, is improved arc stability, improves appearance of weld, be preferably added a certain amount of Slag former,
Wherein, rutile, potassium feldspar, prodan, Fluorspar Powder play slag making, stabilization electric arc as slag former, reduce and fly The effect splashed, the effect for making deposited metal surface quality further be lifted.When using, to make rutile, potassium feldspar, fluorine silicon Sour sodium, Fluorspar Powder content in the scope.When the total content of rutile, potassium feldspar, prodan, Fluorspar Powder is less than 10 matter During amount part, its slag making, stabilization electric arc, reduction splashing, the effect of improvement deposited metal surface forming be not obvious.On the other hand, such as When fruit rutile, potassium feldspar, prodan, the total content of Fluorspar Powder are higher than 17 mass parts, stabilising arc, the effect splashed is not reduced also not Further improve, and relatively reduce the addition of alloying element.Have been acknowledged by following result:Make rutile, potassium feldspar, fluorine Sodium metasilicate, fluorite powder content respectively scope more than 10 mass parts and below 17 mass parts when, good stabilising arc, drop can be obtained Low spatter, the effect for improving deposited metal shaping.
For hardfacing alloy powder of the invention, preferably described electrolytic manganese, 45# ferrosilicon, ferrotianium, crome metal, high carbon chromium The granularity of iron, graphite, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, oxidation yttrium powder, rutile, potassium feldspar, prodan and Fluorspar Powder is equal It is 75 microns~180 microns.(i.e. granularity is -80 mesh of mesh~+200).
Preferably, when alloy powder of the invention is used to process 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 Having added Cr, Ni, Mo etc. can form galvanic cell between element, therefore cladding layer and base material, so that there is electrochemical corrosion, but by All with the addition of the elements such as Cr, Ni, Mo and cause that electrochemical reaction is difficult to Fast Persistence with cladding powder in itself in hot-work die Carry out.First, Cr can be dissolved in so as to form Ni-Cr solid solution in Ni in the alloy, and play significant passivation;Secondly, In corrosion process, the Fe in Cr parts substitution rusty scale alpha-feooh forms oxyhydroxide α-(Fe1-xCrx) OOH.Due to This rusty scale microstructure is comparatively dense and stablizes relatively, matrix material can be well isolated with corrosive medium, while its pole Impedance high can well reduce the speed of electrochemical reaction again.And Mo can crystal grain thinning, solution strengthening, formation in steel Cured layer, this cured layer is firmly combined with matrix, forms passivation, thus with good protective value.Simultaneously because Laser beam is short with the interaction time of powder in laser cladding process, therefore has larger cooling in rapidly cooling procedure Degree, and the alloying element in powder can form multiple compounds, further increase the quantity of non-spontaneous forming core, greatly improve forming core Rate, the final fine microstructures for causing cladding layer are fine and close.Fine and closely woven tissue not only reduces the impurity content on unit crystal boundary, and The component segregation formed due to quick cooling is reduced, so as to reduce the influence of the accelerated corrosion because of galvanic effect.Institute Either from for corrosion weight loss amount, according further to more scientific corrosion weight loss rate analysis, all to illustrate hot-work die Comprising 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.Demonstrating powder of the invention has the decay resistance consistent with base material, very Good meets the design requirement that hot-work die reparation is remanufactured.
The cross sectional shape of flux-cored wire is more complicated, more symmetrical, and electric arc is more stable, and the metallurgical reaction of medicine core and protective effect are got over Fully.But with the reduction of gage of wire, this difference is gradually reduced.For flux-cored wire of the invention, when welding wire is straight When footpath is between 2.4 millimeters~4.0 millimeters, when flux-cored wire cross sectional shape is using " O " type, arc stability highest.
In above-mentioned hot-work die built-up welding metal powder core solder wire:The tube wall preferred SPCC or H08A of the flux-cored wire is low It is prepared by carbon steel steel band.
It is preferred embodiment:The tube wall of the flux-cored wire selects wall thickness for 0.3~0.5mm, and width is 14~16mm SPCC steel bands prepare;Its chemical composition is preferred by percentage to the quality:C is not more than 0.12%, Si and is not more than 0.05%, Mn not It is not more than 0.035%, P more than 0.5%, S to be not more than 0.035%, remaining do not influence for Fe and the impurity of performance.
The filling rate of above-mentioned hot-work die built-up welding metal powder core solder wire be 30%~55% (filling rate be medicinal powder quality With medicinal powder, the ratio of steel band quality sum).
The effect of each component is as follows in above-mentioned medicinal powder:
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, and addition coating, the effect of silicomanganese combined deoxidation are combined with electrolytic manganese It is good.
The effect of ferrotianium is deoxidation, and carbide precipitate TiC and nitride TiN, crystal grain thinning, by fine grain and precipitated phase Two ways strengthens weld seam, improves the hardness of deposited metal.
The effect of crome metal and high carbon ferro-chrome is that, to weld metal transition Cr, Resistance of Weld Metal plays solution strengthening effect, The weld seam of carbide precipitate reinforcing simultaneously, Cr contents reach more than 11% can also improve the high-temperature oxidation resistance of deposited metal.It is high Carbon ferrochrome in addition to transition Cr, also to weld seam transition C.
The effect of graphite is that, to weld seam transition C, the appropriate C content of control weld seam forms 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, and 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 the high temperature hardness and wear resistance at elevated temperature of weld metal.
The effect of nickel powder can be raising stabilization of austenite, slow down transformation of austenite to martensite, increase remaining difficult to understand Family name's scale of construction, improves plasticity, the toughness of deposited metal, and can reduce martensite start temperature Ms points, can reduce heap Weld the residual stress of metal.
The effect of nano silicon nitride chromium powder is, to weld seam transition N, nitride to be formed with nitride forming element Ti, V, Cr etc., Crystal grain thinning, improves the high temperature hardness and 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 of category;The surface tension of molten drop is reduced, promotes the droplet transfer, reduced 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, and improves processing property of electrode, slag making.
The effect of prodan 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 of regulation 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 is comprised the following steps:
(1) proportioning for pressing medicinal powder formula with powder weighs medicinal powder, first by the less graphite of proportion, rutile, potassium feldspar, fluorine Sodium metasilicate, Fluorspar Powder are pressed after formula rate is weighed and mixed, and powder is mixed 8-10 minutes 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, nickel powder, nanometer chrome nitride The deoxidizing alloys such as powder, oxidation yttrium powder are added in slag former mixed powder after being weighed by formula rate, are further continued for 8-10 points of mixed powder Clock, obtains medicinal powder.
Wherein:The medicinal powder package contains deoxidizing alloy and slag former, and medicinal powder deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 4-8,45# ferrosilicon 2-6, ferrotianium 1-4, crome metal 20-35, high carbon ferro-chrome 20-30, graphite 0-5, vanadium iron 2-6, molybdenum-iron 12-18, tungsten powder 2-4, nickel powder 4-8, nano silicon nitride chromium powder 1-2, oxidation yttrium powder 2-6;The formula of slag former is as follows in terms of mass parts: Rutile 5-8, potassium feldspar 2-3, prodan 2-3, Fluorspar Powder 1-3.Slag former is the 8-10% of medicinal powder quality.Nanometer chrome nitride The granularity of powder is that more than 99% less than 100 nanometers, (i.e. granularity is -80 mesh for 75 microns~180 microns for the granularity of other powder ~+200 mesh);
(2) after 14~16 mm wides, 0.3~0.5 millimeters thick mild steel steel band being cleaned with ultrasonic cleaning apparatus, with now Some flux-cored wire production equipments, are rolled into U-shaped, then to the medicinal powder for adding step (1) to be made in U-shaped grain, fill out by above-mentioned steel band It is 30~55% to fill rate (ratio of medicinal powder quality and flux-cored wire quality);
(3) U-lag is healed up, medicinal powder is wrapped up wherein, the position that heals up is using the overlap joint connected mode (width of overlap It is 1-2mm, is ensured by the format roll of existing flux-cored wire production equipment):Touched by wire drawing, by road drawing, tube reducing, finally make it Diameter reaches 2.4mm~4.0mm.
(4) the flux-cored wire layer obtained by step (3) is coiled into disk, obtains final product hot-work die flux-cored welding wire for overlaying welding finished product.
Wherein:The preferred SPCC steel bands of above-mentioned steps (2) the mild steel steel band.
For flux-cored wire of the invention, when the gas flow of MAG weldering gases is less than 18L/min, protective gas Deflection is not enough, and weld seam easily produces the defects such as stomata;When gas flow is more than 23L/min, gas, and oxidisability are not only wasted Enhancing, can form one layer of dimmed oxide skin on face of weld, decline weldquality, while being possible to produce turbulent reduction Protecting effect.Therefore, preferred gas flow is 18L/min-23L/min in the present invention.
Arc voltage and welding current are the main technologic parameters of MAG welderings, crucial ginseng when arc voltage is short circuiting transfer Number, arc voltage matches with welding current, can obtain small, the good stabilized welding process of appearance of weld of splashing.The present invention In preferred welding current 300A-450A;Voltage 28V-42V.
Because short circuiting transfer uses thin welding wire, so resistance heat produced in electrode extension is to welding effect shadow Sound is very big.Extension elongation increases, and the resistance heat on welding wire increases, and wire melting is accelerated, and productivity ratio is improved.But with regard to the present invention Speech, when extension elongation is more than 28mm, welding wire is susceptible to overheat and forms section fusing, splashes serious, and welding process is unstable.Simultaneously After extension elongation increase, the distance between nozzle and weldment also increases, and causes gas shield effect to be deteriorated.But extension elongation is less than During 14mm, the distance between nozzle and electric arc is too short, the easy plug nozzle of splashing metal.Therefore, preferred welding wire is stretched in the present invention Go out length for 14mm-28mm.
Above-mentioned hot-work die flux-cored welding wire for overlaying welding is welded using argon-rich gas shielded MAG, welding current 300A-450A;Electricity Pressure 28V-42V;Gas flow 18L/min-23L/min;Electrode extension 14mm-28mm.The welding technological properties of welding wire is good, Arc stability, small, crack resistance of splashing are good.The hardness of deposited metal is HRC40-55.
The application of flux-cored wire of the 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 has of the present invention is:
(1) this patent flux-cored wire has good processing performance, is suitable to automatic welding, welding production efficiency high.By Face of weld forms a layer thickness no more than 0.3mm, the thin layer slag being evenly distributed, and improves appearance of weld, is also suitable for full position Put welding.Can be used for the manufacture of displacement difficult large-scale hot-work die during built-up welding and reparation.
(2) composition of deposited metal can be by changing the composition adjustment of flux-cored wire medicinal powder, it is possible to produce series is produced Product are used for different hot die steels, have a wide range of application.
(3) this patent flux-cored wire optimizes deposited metal chrome content, deposited metal is had good high-temperature oxidation resistant Performance, significantly improves the service life of hot-work die.
(4) this patent flux-cored wire by coating add nano silicon nitride chromium powder and nitride forming element, by anti- Answer fabricated in situ nitride, nitride mutually has the advantages that size is tiny, high-temperature stable as gap, significantly improves built-up welding gold The high temperature hardness and high-temperature stability of category.
(5) this patent is dilute by preferred (simple metal such as being selected, less with ferroalloy) and addition of steel band and medicinal powder raw material 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) proportioning for pressing medicinal powder formula with powder weighs medicinal powder, first by the less rutile of proportion, potassium feldspar, fluosilicic acid Sodium, Fluorspar Powder are pressed after formula rate is weighed and mixed, and powder is mixed 8 minutes with existing mixed powder machine, obtain slag former mixed-powder;Then By electrolytic manganese, 45# ferrosilicon, ferrotianium, crome metal, high carbon ferro-chrome, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, nano silicon nitride chromium powder, yittrium oxide The deoxidizing alloys such as powder are added in slag former mixed powder after being weighed by formula rate, are further continued for mixed powder 8 minutes, obtain medicinal powder.
Wherein:The medicinal powder package contains deoxidizing alloy and slag former, and medicinal powder deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 4,45# ferrosilicon 3, ferrotianium 2, crome metal 20, high carbon ferro-chrome 20, vanadium iron 2, molybdenum-iron 12, tungsten powder 2, nickel powder 4, nano silicon nitride Chromium powder 1, aoxidizes yttrium powder 2;The formula of slag former is as follows in terms of mass parts:Rutile 8, potassium feldspar 2, prodan 2, Fluorspar Powder 2. Slag former is the 10% of medicinal powder quality.The granularity of nano silicon nitride chromium powder is the grain of other powder more than 99% less than 100 nanometers Spend is 75 microns~180 microns (i.e. granularity is -80 mesh of mesh~+200);
(2) by 14mm is wide, after the thick SPCC steel bands of 0.3mm clean with ultrasonic cleaning apparatus, given birth to existing flux-cored wire Product equipment, U-shaped is rolled into by above-mentioned steel band, then to the medicinal powder for adding step (1) to be made in U-shaped grain, filling rate (medicinal powder quality with The ratio of flux-cored wire quality) it is 35%;
(3) U-lag is healed up, medicinal powder is wrapped up wherein, the position that heals up is using overlap joint connected mode;Touched by wire drawing, by Road drawing, tube reducing, finally make its diameter reach 2.4mm.
(4) the flux-cored wire layer obtained by step (3) 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 uses argon-rich gas Ar+1%CO2The consumable electrode gas-arc of protection Weldering, welding current 300A;Voltage 28V;Gas flow 18L/min;Electrode extension 14mm.The welding technological properties of welding wire Good, arc stability, small, crack resistance of splashing are good.The hardness of deposited metal is HRC42.
Embodiment 2:
(1) proportioning for pressing medicinal powder formula with powder weighs medicinal powder, first by the less graphite of proportion, rutile, potassium feldspar, fluorine Sodium metasilicate, Fluorspar Powder are pressed after formula rate is weighed and mixed, and powder is mixed 10 minutes with existing mixed powder machine, obtain non-alloyed mixed powder; Then by electrolytic manganese, 45# ferrosilicon, ferrotianium, crome metal, high carbon ferro-chrome, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, nano silicon nitride chromium powder, oxygen Change after the deoxidizing alloys such as yttrium powder are weighed by formula rate and be added in non-alloyed mixed powder, be further continued for mixed powder 8 minutes, obtain medicine Powder.
Wherein:The medicinal powder package contains deoxidizing alloy and slag former, and medicinal powder deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 8,45# ferrosilicon 6, ferrotianium 4, crome metal 35, high carbon ferro-chrome 30, graphite 3, vanadium iron 6, molybdenum-iron 18, tungsten powder 4, nickel powder 5 is received Rice nitridation chromium powder 2, aoxidizes yttrium powder 6;The formula of slag former is as follows in terms of mass parts:Rutile 5, potassium feldspar 1, prodan 3, firefly Stone flour 1.Slag former is the 8% of medicinal powder quality.The granularity of nano silicon nitride chromium powder is other powder more than 99% less than 100 nanometers The granularity at end is 75 microns~180 microns (i.e. granularity is -80 mesh of mesh~+200);
(2) by 16mm is wide, after the thick SPCC steel bands of 0.3mm clean with ultrasonic cleaning apparatus, given birth to existing flux-cored wire Product equipment, U-shaped is rolled into by above-mentioned steel band, then to the medicinal powder for adding step (1) to be made in U-shaped grain, filling rate (medicinal powder quality with The ratio of flux-cored wire quality) it is 55%;
(3) U-lag is healed up, medicinal powder is wrapped up wherein, the position that heals up is using overlap joint connected mode;Touched by wire drawing, by Road drawing, tube reducing, finally make its diameter reach 4.0mm.
(4) the flux-cored wire layer obtained by step (3) 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 uses Ar+1.5%CO2Full-argon gas shielded arc welding, welding current 450A; Voltage 42V;Gas flow rate 23L/min;Electrode extension 28mm.The welding technological properties of welding wire is good, arc stability, splashing Small, crack resistance is good.The hardness of deposited metal is HRC52.
Embodiment 3:
(1) proportioning for pressing medicinal powder formula with powder weighs medicinal powder, first by the less graphite of proportion, rutile, potassium feldspar, fluorine Sodium metasilicate, Fluorspar Powder are pressed after formula rate is weighed and mixed, and powder is mixed 9 minutes with existing mixed powder machine, obtain non-alloyed mixed powder;So Afterwards by electrolytic manganese, 45# ferrosilicon, ferrotianium, crome metal, high carbon ferro-chrome, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, nano silicon nitride chromium powder, oxidation The deoxidizing alloys such as yttrium powder are added in non-alloyed mixed powder after being weighed by formula rate, are further continued for mixed powder 9 minutes, obtain medicine Powder.
Wherein:The medicinal powder package contains deoxidizing alloy and slag former, and medicinal powder deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 6,45# ferrosilicon 4, ferrotianium 3, crome metal 30, high carbon ferro-chrome 25, graphite 3, vanadium iron 4, molybdenum-iron 15, tungsten powder 3, nickel powder 6 is received Rice nitridation chromium powder 1, aoxidizes yttrium powder 4;The formula of slag former is as follows in terms of mass parts:Rutile 7, potassium feldspar 2, prodan 3, firefly Stone flour 2.Slag former is the 9% of medicinal powder quality.The granularity of nano silicon nitride chromium powder is other powder more than 99% less than 100 nanometers The granularity at end is 75 microns~180 microns (i.e. granularity is -80 mesh of mesh~+200);
(2) by 16mm is wide, after the thick SPCC steel bands of 0.5mm clean with ultrasonic cleaning apparatus, given birth to existing flux-cored wire Product equipment, U-shaped is rolled into by above-mentioned steel band, then to the medicinal powder for adding step (1) to be made in U-shaped grain, filling rate (medicinal powder quality with The ratio of flux-cored wire quality) it is 40%;
(3) U-lag is healed up, medicinal powder is wrapped up wherein, the position that heals up is using overlap joint connected mode;Touched by wire drawing, by Road drawing, tube reducing, finally make its diameter reach 3.2mm.
(4) the flux-cored wire layer obtained by step (3) 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 uses Ar+1%CO2Full-argon gas shielded arc welding, welding current 390A;Electricity Pressure 38V;Gas flow rate 20L/min;Electrode extension 20mm.The welding technological properties of welding wire is good, arc stability, splash it is small, Crack resistance is good.The hardness of deposited metal is HRC40.
Embodiment 4:
(1) proportioning for pressing medicinal powder formula with powder weighs medicinal powder, first by the less graphite of proportion, rutile, potassium feldspar, fluorine Sodium metasilicate, Fluorspar Powder are pressed after formula rate is weighed and mixed, and powder is mixed 8 minutes with existing mixed powder machine, obtain non-alloyed mixed powder;So Afterwards by electrolytic manganese, 45# ferrosilicon, ferrotianium, crome metal, high carbon ferro-chrome, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, nano silicon nitride chromium powder, oxidation The deoxidizing alloys such as yttrium powder are added in non-alloyed mixed powder after being weighed by formula rate, are further continued for mixed powder 8 minutes, obtain medicine Powder.
Wherein:The medicinal powder package contains deoxidizing alloy and slag former, and medicinal powder deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 4,45# ferrosilicon 6, ferrotianium 4, crome metal 35, high carbon ferro-chrome 30, graphite 5, vanadium iron 6, molybdenum-iron 12, tungsten powder 4, nickel powder 8 is received Rice nitridation chromium powder 2, aoxidizes yttrium powder 6;The formula of slag former is as follows in terms of mass parts:Rutile 6, potassium feldspar 3, prodan 2, firefly Stone flour 1.Slag former is the 8% of medicinal powder quality.The granularity of nano silicon nitride chromium powder is other powder more than 99% less than 100 nanometers The granularity at end is 75 microns~180 microns (i.e. granularity is -80 mesh of mesh~+200);
(2) by 16mm is wide, after the thick SPCC steel bands of 0.3mm clean with ultrasonic cleaning apparatus, given birth to existing flux-cored wire Product equipment, U-shaped is rolled into by above-mentioned steel band, then to the medicinal powder for adding step (1) to be made in U-shaped grain, filling rate (medicinal powder quality with The ratio of flux-cored wire quality) it is 45%;
(3) U-lag is healed up, medicinal powder is wrapped up wherein, the position that heals up is using overlap joint connected mode;Touched by wire drawing, by Road drawing, tube reducing, finally make its diameter reach 3.2mm.
(4) the flux-cored wire layer obtained by step (3) 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 uses argon-rich gas Ar+1.5%CO2The consumable electrode gas-arc of protection Weldering, welding current 390A;Voltage 38V;Gas flow 20L/min;Electrode extension 20mm.The welding technological properties of welding wire Good, arc stability, small, crack resistance of splashing are good.The hardness of deposited metal is HRC48.
Comparative example 1
This comparative example is yittrium oxide to be free of in composition of raw materials, to the hot tired of deposited metal with the difference of embodiment 1 Labor is tested, and specimen size is 50 × 20 × 1.5 (mm), in the center vertical thickness direction on 20mm one side, opens 60 ° of V-types Breach, carries out 700 DEG C -20 DEG C of circulating-heating, cooling, and fatigue behaviour is reflected with the cycle-index for 0.5mm crackles occur.Be free of The cycle-index of the comparative example 1 of yttrium oxide powder is 21 times, is 43 containing 2 parts of cycle-indexes of the embodiment of (quality) 1 of yittrium oxide It is secondary.By the comparison with 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 that nano silicon nitride chromium powder is added without in composition of raw materials with the difference of embodiment 1, 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, and the test value of U-shaped notch impact toughness is 1.06J/ cm2, it is the 5CrNiMo mould steel surface overlayings of 80mm in thickness, 250 DEG C of preheating can just occur without crackle;Embodiment 1 it is U-shaped The test value of notch impact toughness is 1.21J/cm2, it is the 5CrNiMo mould steel surface overlayings of 80mm in thickness, preheat 50 DEG C Crackle can be occurred without.Show that the nano silicon nitride chromium powder in medicine core of the present invention can effectively improve the toughness and cracking resistance of deposited metal Performance.
Comparative example 3
This comparative example is that granularity is used in composition of raw materials is 75 microns~180 microns with the difference of embodiment 1 The nitridation chromium powder of (i.e. granularity is -80 mesh of mesh~+200), 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 Higher hardness is kept under deposited metal high temperature, and the hardness of deposited metal is more uniform.Micron-sized chromium nitride is larger due to particle, Activity is smaller, because welding pool cooling velocity is fast under existing addition, causes metallurgical reaction insufficient, it is impossible to effectively to carry The high temperature hardness and structure stability of deposited metal high.
Although above-mentioned be described to specific embodiment of the invention, not to the limit of the scope of the present invention System, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art need not pay The various modifications or deformation made by going out creative work are still within protection scope of the present invention.

Claims (10)

1. a kind of flux-cored wire special that built-up welding is repaired for hot-work die, it is characterised in that including welding wire tube wall and being wrapped in Medicinal powder in it;The medicinal powder package contains deoxidizing alloy and slag former, and the slag former accounts for the 8-10% of medicinal 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, crome metal 20-35, high carbon chromium Iron 20-30, graphite 0-5, vanadium iron 2-6, molybdenum-iron 12-18, tungsten powder 2-4, nickel powder 4-8, nano silicon nitride chromium powder 1-2, oxidation yttrium powder 2- 6;The formula of slag former is as follows in terms of mass parts:Rutile 5-8, potassium feldspar 2-3, prodan 2-3, Fluorspar Powder 1-3.
2. flux-cored wire as claimed in claim 1, it is characterised in that the deoxygenated alloy agent prescription is as follows in terms of mass parts: Electrolytic manganese 5-8,45# ferrosilicon 3-6, ferrotianium 2-4, crome metal 25-35, high carbon ferro-chrome 24-30, 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, oxidation yttrium powder 3-6;The formula of slag former is in terms of mass parts It is as follows:Rutile 6-8, potassium feldspar 2.4-3, prodan 2.4-3, Fluorspar Powder 1.5-3.
3. flux-cored wire as claimed in claim 1 or 2, it is characterised in that the deoxygenated alloy agent prescription in terms of mass parts as Under:Electrolytic manganese 5-7,45# ferrosilicon 3-5, ferrotianium 2-3, crome metal 25-30, high carbon ferro-chrome 24-28, graphite 2-4, vanadium iron 3-5, molybdenum Iron 14-16, tungsten powder 2.5-3.5, nickel powder 5-7, nano silicon nitride chromium powder 1.2-1.6, oxidation yttrium powder 3-5;The formula of slag former is with matter Amount part meter is as follows:Rutile 6-7, potassium feldspar 2.4-2.8, prodan 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 Mn contains the composition of the electrolytic manganese by quality ratio Amount is not less than 99.5%;The composition of 45# ferrosilicon is by quality ratio 40.0%~47.0%Si, 0.1%C, balance of Fe and not Influence the impurity of performance;The composition of ferrotianium is by quality ratio 23%~35%Ti, 8.5%Al, 5%Si, 2.5%Mn, surplus The impurity of performance is not influenceed for Fe and;Cr contents are not less than 98% to the composition of crome metal by quality ratio;The composition of high carbon ferro-chrome Cr is no more than 0.04% for 6%~10%, Si is not more than 3%, S not less than 60%, C no more than 0.04%, P by quality ratio, Balance of Fe and the impurity of performance is not influenceed;The composition of vanadium iron is by quality ratio 50%V, 0.2%C, 2%Si, 0.8%Al, Balance of Fe and the impurity of performance is not influenceed;The composition of molybdenum-iron is by quality ratio 50%Mo, 3%Si, not balance of Fe and shadow Ring the impurity of performance;W content is not less than 98% to the composition of tungsten powder by quality ratio;Ni contains the composition of metal nickel powder by quality ratio Amount is not less than 98%;The composition of yttrium oxide powder Y by percentage to the quality2O3Content is not less than 99%;The composition of potassium feldspar is with matter Amount percentages are 62%SiO2, 17%Al2O3, K2O+Na2O is not less than 12%, K2O is no more than 0.04%, P not less than 8%, S No more than 0.04%;The composition of rutile TiO by percentage to the quality2Content is not less than 92%;The composition of prodan is with matter Amount percentages Na2SiF4Content is not less than 95%;The composition of Fluorspar Powder CaF by percentage to the quality2Content is not less than 95%.
5. flux-cored wire as claimed in claim 1 or 2, it is characterised in that the granularity of the nano silicon nitride chromium powder is received less than 100 Rice;The electrolytic manganese, 45# ferrosilicon, ferrotianium, crome metal, high carbon ferro-chrome, vanadium iron, molybdenum-iron, tungsten powder, nickel powder, oxidation yttrium powder, golden red The granularity of stone, potassium feldspar, prodan and Fluorspar Powder is 75 microns~180 microns.
6. flux-cored wire as claimed in claim 1, it is characterised in that the welding wire tube wall uses SPCC or H08A mild steel steel It is prepared by band.
7. flux-cored wire as claimed in claim 1, it is characterised in that it is 0.3~0.5mm that the welding wire tube wall uses wall thickness, Width is prepared by the SPCC steel bands of 14~16mm;Its chemical composition is by percentage to the quality:It is little that C is not more than 0.12%, Si It is not more than 0.5%, S and is not more than 0.035%, P in 0.05%, Mn and is not more than 0.035%, balance of Fe and does not influence the miscellaneous of performance Matter.
8. flux-cored wire as claimed in claim 1, it is characterised in that the filling rate of the flux-cored wire is 30%~55%.
9. the argon-rich gas shielded consumable electrode gas protection welding method of any described flux-cored wires of claim 1-8, its It is characterised by, technological parameter is as follows:Welding current 300A-450A;Voltage 28V-42V;Gas flow 18L/min-23L/min; Welding wire stretches out the length 14mm-28mm of ignition tip.
10. application of any described flux-cored wires of claim 1-8 in hot die steel is processed, it is characterised in that described Contain Cr, Ni, Mo in hot die steel.
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