CN106346167A - Welding rod for welding of martensite heat-resistant steel - Google Patents

Welding rod for welding of martensite heat-resistant steel Download PDF

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Publication number
CN106346167A
CN106346167A CN201610827615.0A CN201610827615A CN106346167A CN 106346167 A CN106346167 A CN 106346167A CN 201610827615 A CN201610827615 A CN 201610827615A CN 106346167 A CN106346167 A CN 106346167A
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welding
core wire
welding rod
coating
content
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CN106346167B (en
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刘正东
陈正宗
马龙腾
包汉生
干勇
杨钢
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Central Iron and Steel Research Institute
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Central Iron and Steel Research Institute
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/308—Fe as the principal constituent with Cr as next major constituent
    • B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection 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
    • B23K35/3601—Selection 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
    • B23K35/3602—Carbonates, basic oxides or hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding
    • B23K35/406—Filled tubular wire or rods

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The invention discloses a welding rod for welding of martensite heat-resistant steel and belongs to the technical field of welding materials. The welding rod consists of a core wire and a coating, wherein the core wire is prepared from components in percentage by weight as follows: 0.07%-0.10% of C, less than or equal to 0.3% of Si, 0.3%-0.7% of Mn, less than or equal to 0.004% of P, less than or equal to 0.002% of S, 8.5%-9.5% of Cr, 2.8%-3.3% of W, 2.8%-3.5% of Co, 0.04%-0.08% of Nb, 0.15%-0.25% of V, 0.8%-1.0% of Cu, 0.007%-0.011% of N, 0.011%-0.020% of B and the balance of Fe; the coating is prepared from components as follows: 30%-45% of marble, 18%-25% of fluorite, 5%-10% of rutile, 10%-16% of barium carbonate, 5%-10% of ferrotitanium, 1.5%-3% of electrolytic manganese, 5%-10% of iron powder, 0.4%-0.8% of sodium carbonate, 0.4%-0.8% of carboxymethyl cellulose and 0.8%-3% of chromium metal powder. The welding rod has the advantages that the arc is stable during welding, few splashes are caused, the all-position operability is good, the slag detachability is good, formed welds are attractive in appearance, and deposited metal after welding has high strength and high toughness close to that of a parent metal, higher endurance strength and excellent crack sensitivity.

Description

A kind of martensite heat-resistant steel welding welding rod
Technical field
The invention belongs to technical field of welding materials, more particularly to a kind of martensite heat-resistant steel welding welding rod.Welding rod Supporting for martensite heat-resistant steel g115 welding, arc stability during welding, splashing is few, all positon good operability, and the removability of slag is good, weldering It is seamed into that shape is attractive in appearance and postwelding deposited metal has the high intensity close with mother metal, a high tenacity, higher creep rupture strength, excellent is anti- Crack sensitivity.
Background technology
Improving fired power generating unit vapor (steam) temperature parameter is to improve generatine set heat efficiency and realize the most important measure of reduction of discharging of economizing on coal.
At present, several large-scale power units of China are just actively establishing first of the world 630 DEG C of ultra supercriticals fire coal Demonstration Station； Entrusted by National Energy Board, the total institute of power planning is in repeatedly organizing 650 DEG C of ultra-supercritical power generation technology feasibilities Seminar.
Heat proof material is the main bottleneck problem that restriction fired power generating unit develops to more high parameter.Research and practice table Bright, p92 type martensite heat-resistant steel can be used for the part heavy caliber boiler tube manufacture of below 620 DEG C of vapor (steam) temperatures.Patent zl " 201210574445.1 650 DEG C of Steel for steam-temperature ultra-supercritical thermal power unit and preparation method ", it is China's independent development Can be used for the novel martensitic heat resisting steel of 650 DEG C of steam parameter ultra supercritical coal-fired unit, i.e. heat resisting steel g115, its room temperature tensile Performance, impact property, mechanical behavior under high temperature and enduring quality are all significantly larger than the p92 steel in gb5310 and asme standard；Meanwhile, It is also above the creep rupture strength value under patent cn 101680065 b " ferrite heat resistant steel " (i.e. save12ad) the same terms About 20～30%.The novel martensitic heat resisting steel g115 of China's independent development can be used for 620 DEG C -650 DEG C vapor (steam) temperature heavy calibers Boiler tube manufactures, and therefore novel martensitic heat resisting steel g115 becomes the coal-fired demonstration electricity of 630 DEG C and 650 DEG C ultra supercriticals of following China The preferred material of station owner's jet chimney, promotes innovation to drive today of development in country, has important practical significance.
During power plant construction and boiler erection, the connection between pipeline and pipeline is realized by welding, therefore, The mechanical property of the processing performance of welding and postwelding deposited metal is most important.Welding technological properties is poor, leads to welding difficulty to increase Plus, power plant construction cycle stretch-out, and affect weld metal mechanical property；If weld metal mechanical property and mother metal are not Join, easily lead to military service process piping weld metal initial failure to rupture.
According to document (suppression of grain refinement in heat-affected zone of 9cr- 3w-3co-vnb steels, materials science＆engineering a, 2016 (655): 168-174.) report, Easily the 4th type fracture (type iv fracture) in 9cr-3w-3co series heat-resistant steel postwelding, leads to the deposited metal lasting longevity Life reduces.
Patent cn 103071946 b " the supporting welding rod of supercritical jessop and its production method ", core wire is carbon steel Silk, its chemical composition mass percent is c≤0.10%；Mn 0.30～0.55%；Si≤0.08%；S≤0.005%；p≤ 0.006%；Cr≤0.10%；Ni≤0.30%；Al≤0.030%；Cu≤0.20%；As≤0.007%；Balance of fe；With In welding supercritical pressure turbine zg1cr10movnbn and t91/p91 pipeline heat resisting steel.
Patent cn 103008917 b " a kind of ultra supercritical new ferrite heat resistant steel electrode and preparation method thereof ", core wire For the special core wire of h08cr9wmo, its chemical composition mass percent is c≤0.05%；Mn 0.30～0.60%；si≤ 0.15%；S≤0.006%；P≤0.006%；Cr 8.50～10.0%；Ni≤0.20%；Mo 0.50～0.70%；w 1.40～1.90%；Nb≤0.07%；N≤0.07%；Al≤0.025%；Cu≤0.10%；As≤0.006%；Balance of fe；For welding ultra supercritical heat resisting steel t/p92.
Patent cn 103737199 b " a kind of ultra supercritical heat resistant steel electrode and its production method ", core wire welds for h08a Core, its chemical composition mass percent is c≤0.05%；Mn 0.30～0.60%；Si≤0.15%；S≤0.006%；p≤ 0.006%；Cr≤0.20%；Ni≤0.20%；Mo≤0.20%；Nb≤0.07%；N≤0.07%；Al≤0.025%；cu ≤ 0.10%；As≤0.006%；Balance of fe；For welding ultra supercritical heat resisting steel cb2/fb2.
The supporting welding rod of the special heat resisting steel of novel martensitic heat resisting steel g115 is not also had on existing market, no matter is joined using p92 Set welding rod or nickel-base alloy (as 617 nickel-base alloys and 82 alloys) welding rod, all there is a problem of overcoming.One side deposition Metal room temperature, mechanical behavior under high temperature are poor, and strength and toughness mismatches, and enduring quality can not meet requirement；On the other hand, two All have during kind of welding rod welding that different degrees of arc stability is poor, blow force of arc is little, and spatter is big, and welding bead is narrow, weld seam one-tenth The shortcomings of shape is poor, the removability of slag is good.
Close on 630 DEG C of ultra supercritical fire coal Demonstration Station completions time of project with China, novel martensitic heat resisting steel g115 is The preferred material of this demonstration Main Steam Pipeline of Unit, develops mating with novel martensitic heat resisting steel g115, low cost new Welding rod is applied for the commercial introduction of g115, has important practical significance.Therefore, invent a kind of novel martensitic heat resisting steel G115 welding rod special for special is imminent.
Content of the invention
Present invention aim at providing a kind of martensite heat-resistant steel welding welding rod, for novel martensitic heat resisting steel g115 Composition, in combination property, and engineering the features such as the practicality of welding, research and develop a kind of novel martensitic heat resisting steel g115 Special-purpose assorted welding rod use in welding, to reach carrying out to g115 steel welding, its weld deposited metal not only have close with mother metal Chemical composition, and have the excellent in strength-toughness matching with mother metal mate, high creep rupture strength and excellent anti-crack Performance, deposited metal 650 DEG C/105Hour creep rupture strength extrapolated value is higher than 105mpa；For giving full play to the welding of g115 steel The premium properties of mother metal, arc stability during welding, splash few, all positon good operability, the removability of slag is good, and appearance of weld is attractive in appearance, gram Take the deficiency existing for prior art.
The present invention be the technical scheme is that by its technical problem of solution
The welding rod of the present invention includes core wire, and wraps in the coating on core wire surface, it is critical only that by weight percentage, Core wire component weight percentages are: c 0.07～0.10%；Si≤0.3%；Mn 0.3～0.7%；P≤0.004%；s≤ 0.002%；Cr 8.5～9.5%；W 2.8～3.3%；Co 2.8～3.5%；Nb 0.04～0.08%；V 0.15～ 0.25%；Cu 0.8～1.0%；N 0.007～0.011%；B 0.011～0.020%；Balance of fe；Each in above core wire The total amount of composition is 100%；Compositions of surfacing metal percetage by weight is: marble 30%～45%；Fluorite 18%～25%；Rutile 5%～10%；Brium carbonate 10%～16%；Ferrotianium 5%～10%；Electrolytic manganese 1.5%～3%；Iron powder 5%～10%；Soda 0.4%～0.8%；Carboxymethyl cellulose 0.4%～0.8%；Hafnium metal powfer 0.8%～3%；By the powder of above-mentioned composition press than After example mix homogeneously, the binding agent that total compound composition weighs 16%～25% is added to be uniformly mixed；It is then fed into plodder Inside wrapped on core wire according to a conventional method, then bakeed through low temperature and high temperature,；Gravity coefficient of coating k is 30～50%.
Caco in above-mentioned marble3Content >=96%, caf in fluorite2Content >=96%, rutile tio2>=96%, carbonic acid Baco in barium3>=98%；In ferrotianium, ti contains 25～35%；Na in soda2co3>=99%；Mn >=99.5% in electrolytic manganese, metal Cr >=98% in chromium powder；Each composition is all by weight percentage above.
The described binding agent adding total composition to weigh 16%～25% is potassium-sodium water glass, its modulus 2.8～3.0, and concentration is 41 °～43 °.
Described low temperature stoving temperature is 80 DEG C～120 DEG C；High temperature stoving temperature is 380 DEG C～450 DEG C.
The principle of the invention is as described below:
Two aspects that welding considers: be on the one hand deposited metal (weld seam) characteristic；On the other hand it is welding process manufacturability.
Welding rod includes core wire and wraps up in the coating applying thereon.Core wire has two effects: one is conduction electric current, produces welding electricity Arc；Two is that core wire fusing itself forms the filler metal in weld seam.Because core wire is in high arc temperature effect bottom fusing, formed Droplet transfer, the chemical composition of core wire and performance directly affected performance and the quality of weld seam to molten bath.
Core wire major consideration: deposited metal composition and mechanical property are mated with mother metal, and it is tough to have good impact Property, elevated temperature strength performance and excellent crack-resistance sensitivity are it is often more important that 650 DEG C/105Hour creep rupture strength extrapolated value is higher than 105mpa.Therefore, when designing core wire composition it is considered to welding process scaling loss, core wire composition considers as follows:
C: in core wire, c content is higher, pore in weld seam and the tendency of crackle is bigger.Simultaneously due to carbon in liquid metal A large amount of co that oxidation is formed, also can increase splashing, or form pore in weld seam.Therefore, c content control in welding rod core wire of the present invention System 0.07～0.10%.
Cr: its effect mainly has three aspects: one has been to be dissolved in matrix, plays solution strengthening effect；Two is easily formation cr2o3 Oxide-film, improves resistance to high temperature oxidation and corrosive nature；Three is to form m23c6Type carbide, plays precipitation strength effect.Although improving Cr content is conducive to high-temperature corrosion-resistance performance, but cr too high levels can reduce creep rupture strength, cr in welding rod core wire therefore of the present invention Content controls 8.5～9.5%.
W: be typical solution strengthening element, because the atomic radius than mo for the atomic radius of w is big, w element solid solution causes Distortion of lattice bigger than mo element, so the solid solution strengthening effect of w element is more obvious than mo element.Experimental study shows: in other In the case that condition is constant, with the rising of w content, 9%cr steel when w content is 3% about, 10000 hours creep rupture strengths There is peak-peak；When w content superelevation, the generation of delta ferrite can be led to, very unfavorable to the combination property of steel.So this In invention welding rod core wire, w content range controls 2.8～3.3%.
Co: contain the ferrite former such as higher cr-w solution strengthening element and nb-v precipitation strength in steel, For the formation of delta ferrite in suppression steel, add austenite former co significantly inhibiting the same of delta ferrite formation in steel When, the other performance of steel is not adversely affected substantially.Research finds, adds 3% about co unit in steel under the conditions of 650 DEG C Element has best impact to the creep rupture strength of steel.Co content in welding rod core wire therefore of the present invention controls 2.8～ 3.5%.
The effect of n and b:n mainly has two aspects: one has been solution strengthening effect, but dissolving in steel for the nitrogen under room temperature Degree very little；Two is that n can be with v, and nb forms small and dispersed Second Phase Particle, significantly improves the creep rupture strength of material；But meeting Reduce its plasticity and toughness.B is easily combined into bn in molten pool metal process of setting with n, reduces the content of solid solution n, and b also can refine Crystal grain, solid solution b can suppress the precipitation of the pro-eutectoid ferrite between austenite crystal, improves crack resistance, reduces hydrogen embrittlement.But containing relatively During the b element of high-load, if n too high levels, may with form thick bn granule, in the obdurability of severe weakness steel itself While, also will consume the b element being used for intercrystalline strengthening, thus seriously damaging the creep rupture strength of steel.Research shows, n contains There is a proportioning interval between amount and b content, thick bn both can have been avoided to be formed in this proportioning interval, simultaneously acceptable Significantly creep rupture strength during lifting long at a temperature of 650 DEG C of heat resisting steel.Therefore, in welding rod core wire of the present invention, n content controls 0.007～0.011%；And b content controls 0.011～0.020%；And b/n ratio controls between 1～2.
Nb and v: both are all carbides, can form stable carbide nbc, and this carbide is extremely steady Fixed, it is possible to increase the creep limit of steel and creep rupture strength, particularly nb and v are combined effect when adding and become apparent from.In addition, nb can carry The thermostability of Gao Gang is due to forming stable carbide nbc and laves (nbfe2) phase, dispersion-strengthened effect is preferable.But with The increase nb content can lead to the reduction of elongation percentage, and this is due to nbfe2Volume ratio increase and cause, too high nb content Significantly reduce the toughness of weld metal.Even if the carbide that v is formed is at higher operating temperatures, also it is relatively difficult to assemble, bright The aobvious thermostability reducing creep speed, improving steel.Compound addition easily forms the mx carbide tiny, disperse is stable and produces precipitation Strengthening, optimal with 0.2%v-0.05%nb combined effect, very big on creep rupture strength impact, and to welding performance (thermal crack resistant Stricture of vagina) and toughness Beneficial Effect.Therefore, their content must strictly control.In welding rod core wire of the present invention nb control 0.04～ 0.08%；V content controls 0.15～0.25%；.
Cu: solid solution can hinder dislocation mobile thus reducing creep rate it is also possible to be formed in heat resisting steel in the base The nanometer copper-rich phase of Dispersed precipitate, pinning dislocation, improves the heat resistance of heat resisting steel.When cu content is less than 0.5%, cu element base In the base, the copper-rich phase amount of the nano-grade size of precipitation is few for this solid solution, and strengthening effect is weak.When cu content is higher than 3%, meeting The serious high-temp plastic reducing steel.The scope controlling cu content in welding rod core wire therefore of the present invention is 0.8～1.0%.
In core wire, the harmful element such as s, p is larger to Affecting Rupture Strength, therefore also minimum as far as possible, respectively control s≤ 0.002%；P≤0.004%.
The effect of electrode coating is to form in welding process that to have suitable fusing point, viscosity, density, basicity etc. physico Learn the slag of performance it is ensured that arc stability burns, makes the easy transition of deposited metal, cause a kind of gas around arc region and molten bath The good appearance of weld of atmosphere, protection welding region, acquisition and performance etc..Additionally, deoxidizer, alloy unit also can be added in coating Element or the iron powder of certain content, meet weld metal serviceability or improve deposition efficiency.
Electrode coating mainly considers stabilising arc, slag making, deoxidation, gas making, alloying, bonding and shapes totally seven aspects, is related to Welding arc stablility, appearance of weld, welding position adaptability, spatter and deposited efficiency, removability of slag etc..
Marble: main component is caco3, resolve into cao and co in the presence of arc heat2Gas, cao is alkaline oxygen Compound, can improve the hardness of slag, stablize electric arc, refinement molten drop, increase surface between slag surface tension force and slag-metal and open Power, has de- s, de- p effect, improves the anti-crack ability of deposited metal, liquid metal is played with the effect of slag effect；co2Gas Physical ability reduces the hydrogen dividing potential drop in arc atmosphere, reduces weld seam hydrogen content, and weld zone is played with gas shielded effect.But caco3Excessively When, not only it is roughened molten drop, and decompose co2The process of gas drastically will produce blast and splash, so electrode coating of the present invention Middle marble controls 30%～45%.
Fluorite: main component is caf2, belong to alkaline fluoride, a certain amount of fluorite can reduce the surface of liquid metal Tension force, improves the mobility of slag, reduces weld porosity, improves the physical property of slag, and to appearance of weld, de- slag etc. plays key Effect, is also the main material reducing hydrogen content in weld seam；But in welding process, fluorite decomposes, and can produce harmful gass-fluorination Hydrogen, causes electric arc unstable, therefore needs strictly to control its content, and keeps marble/fluoride=1.7～2.2, therefore, this In invention electrode coating, fluorite controls content 18%～25%.
Rutile: main component is tio2, belong to acidic oxide, Main Function is stabilising arc, slag making, can adjust slag Fusing point, viscosity, surface tension and mobility, improve appearance of weld, reduce and splash, pass is risen to appearance of weld, arc stability Key acts on；But coating fusing point can be made higher, formula did not easily form larger sleeve at that time yet, unfavorable to restarting.Welding rod of the present invention In coating, rutile content controls 5%～10%.
Brium carbonate: slag physical property can be adjusted, slag can be made to be in crisp cellular, improve the effect of the removability of slag. In electrode coating of the present invention, brium carbonate content controls 10%～16%.
Ferrotianium: act primarily as the effect of deoxidizer, when adding together with electrolytic manganese, deoxidation effect is more preferably.Welding rod medicine of the present invention In skin, ferrotianium content controls 5%～10%；
Electrolytic manganese: the effect of desulfurization, deoxidation can be played, can also be strong to weld seam transition (infiltration) mn element, raising weld seam Degree.In electrode coating of the present invention, electrolysis manganese content controls 1.5%～3%.
Soda: improve the extrusion performance of welding rod, there is stabilising arc effect simultaneously, but addition is excessive, then lead to coating to hold The easily moisture absorption.Soda 0.4%～0.8% in electrode coating of the present invention.
Iron powder: play the effect purifying molten bath, simultaneously again can crystal grain thinning, improve deposition efficiency, improve weld impingement tough Property, but unsuitable excessive, because the addition iron powder of excess can make other elementary dilutions.Iron powder amount is added in electrode coating of the present invention Control 5%～10%.
Carboxymethyl cellulose: play cohesive action, improve extrusion performance.Carboxymethyl cellulose level in electrode coating of the present invention Control 0.4%～0.8%.
Binding agent is potassium-sodium water glass.Waterglass is commonly called as sodium silicate, scientific name alkali silicate, reflects waterglass characteristic There are modulus, concentration and viscosity.Due to containing the low ionization potential element such as potassium, sodium in waterglass, in addition to playing cementation, acceptable Play stabilising arc effect, and bonding agent also assists in metallurgical reaction in welding process, potassium-sodium water glass in electrode coating of the present invention Select high mode (2.8～3.0), 41 °～43 ° of concentration.
The present invention has the advantage that and beneficial effect: martensite heat-resistant steel welding welding rod of the present invention is become by above-mentioned core wire Divide and coating each component Proper Match, thus realizing the purpose of the present invention.Novel martensitic heat resisting steel g115 is welded, weldering Full martensitic structure, quenched-temper is obtained, microscopic structure is the tempering rope of w solution strengthening after connecing deposited metal quenching Family name's body, matrix contains the m that tempering separates out23c6Class carbide, and tiny mx phase；Welding deposited metal composition not only have with The close chemical composition of mother metal, and be there is the excellent mechanical performance being matched with mother metal and high-lasting strength, excellent impact Toughness and excellent anti-crack performance；Welding point room temperature impact work(>=45j: tensile strength 740～800mpa under room temperature, surrender Intensity 580～660mpa, percentage elongation >=20%；Deposited metal 650 DEG C/105Hour creep rupture strength extrapolated value is higher than 105mpa；And Arc stability during welding, splashes few, all positon good operability, and the removability of slag is good, and appearance of weld is attractive in appearance.
Specific embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
The mass percent of the present embodiment core wire composition see table:
Element c si mn p s cr w co nb v cu n b fe
Wt.% 0.083 0.1 0.4 0.004 0.002 9.3 3.0 3.2 0.06 0.21 0.85 0.008 0.014 Remaining
Wherein b/n=1.75.
In coating, the percentage by weight of each component see table:
Raw material title Percentage by weight Raw material title Percentage by weight
Marble 40 Electrolytic manganese 2
Fluorite 22 Iron powder 8
Gold fibre stone 8 Soda 0.6
Brium carbonate 12 Carboxymethyl cellulose 0.6
Ferrotianium 6 Hafnium metal powfer 0.8
Wherein marble/fluorite=1.82；
Said ratio is compounded into welding rod crust spice, the binding agent with addition of powder raw material gross weight 22% is potassium-sodium water glass (potassium sodium compares 2: 1), its concentration is 42 °, stirs, and sends in bar press and is wrapped on core wire according to a conventional method, then warp 85 DEG C of low temperature bakees 2.5 hours, and 400 DEG C of high temperature bakees 1 hour,.Gravity coefficient of coating k is 45%.It is made for diameter The welding rod of the various specification such as 2.5mm, 3.2mm, 4.0mm.
According to the electrode surface of above-mentioned technique productions is smooth, high yield rate, eccentric stable.Gained welding rod carries out welding examination Test, arc stability during welding, splash few, the removability of slag is good, and welding rod operating characteristics is excellent, and appearance of weld is attractive in appearance, bead height is fitted In, weld seam slip is moderate.
As follows according to its deposited metal mechanical property of welding rod of said ratio preparation: room temperature impact work(75j；Tension under room temperature Intensity 760mpa, yield strength 600mpa, percentage elongation 22%.
Embodiment 2
The mass percent of the present embodiment core wire composition see table:
Element c si mn p s cr w co nb v cu n b fe
Wt.% 0.07 0.1 0.4 0.004 0.002 8.6 2.9 3.1 0.05 0.23 0.80 0.009 0.015 Remaining
Wherein b/n=1.67.
In coating, the percentage by weight of each component see table:
Raw material title Percentage by weight Raw material title Percentage by weight
Marble 35 Electrolytic manganese 2.5
Fluorite 20 Iron powder 10
Gold fibre stone 10 Soda 0.8
Brium carbonate 13 Carboxymethyl cellulose 0.5
Ferrotianium 7 Hafnium metal powfer 1.2
Wherein marble/fluorite=1.75；
Said ratio is compounded into welding rod crust spice, the binding agent with addition of powder raw material gross weight 25% is potassium-sodium water glass (potassium sodium compares 2: 1), its concentration is 42 °, stirs, and sends in bar press and is wrapped on core wire according to a conventional method, then warp 85 DEG C of low temperature bakees 2.5 hours, and 390 DEG C of high temperature bakees 1 hour,.Gravity coefficient of coating k is 43%.It is made for diameter The welding rod of the various specification such as 2.5mm, 3.2mm, 4.0mm.
According to the electrode surface of above-mentioned technique productions is smooth, high yield rate, eccentric stable.Gained welding rod carries out welding examination Test, arc stability during welding, splash few, the removability of slag is good, and welding rod operating characteristics is excellent, and appearance of weld is attractive in appearance, bead height is fitted In, weld seam slip is moderate.
As follows according to its deposited metal mechanical property of welding rod of said ratio preparation: room temperature impact work(85j；Tension under room temperature Intensity 750mpa, yield strength 590mpa, percentage elongation 25%.
Embodiment 3
The mass percent of the present embodiment core wire composition see table:
Element c si mn p s cr w co nb v cu n b fe
Wt.% 0.09 0.1 0.5 0.004 0.001 9.5 3.1 3.3 0.07 0.24 0.85 0.008 0.014 Remaining
Wherein b/n=1.75.
In coating, the percentage by weight of each component see table:
Raw material title Percentage by weight Raw material title Percentage by weight
Marble 45 Electrolytic manganese 1
Fluorite 21 Iron powder 6
Rutile 5 Soda 0.8
Brium carbonate 10 Carboxymethyl cellulose 0.8
Ferrotianium 9 Hafnium metal powfer 1.4
Wherein marble/fluorite=2.14；
Said ratio is compounded into welding rod crust spice, the binding agent with addition of powder raw material gross weight 16% is potassium-sodium water glass (potassium sodium compares 2: 1), its concentration is 43 °, stirs, and sends in bar press and is wrapped on core wire according to a conventional method, then warp 90 DEG C of low temperature bakees 2 hours, and 410 DEG C of high temperature bakees 1 hour,.Gravity coefficient of coating k is 44%.It is made for diameter The welding rod of the various specification such as 2.5mm, 3.2mm, 4.0mm.
According to the electrode surface of above-mentioned technique productions is smooth, high yield rate, eccentric stable.Gained welding rod carries out welding examination Test, arc stability during welding, splash few, the removability of slag is good, and welding rod operating characteristics is excellent, and appearance of weld is attractive in appearance, bead height is fitted In, weld seam slip is moderate.
As follows according to its deposited metal mechanical property of welding rod of said ratio preparation: room temperature impact work(70j；Tension under room temperature Intensity 785mpa, yield strength 620mpa, percentage elongation 21%.
The present invention adopts such scheme, and main constituent is the novel martensitic heat resisting steel welding welding rod of 9cr-3w-3co system, Can AC and DC dual-purpose, all-position welding.Weld seam (deposited metal) composition is not only close with mother metal chemical composition, and have with Excellent mechanical performance and high-lasting strength, excellent impact flexibility and excellent anti-crack performance that mother metal matches；And weld When arc stability, splash few, all positon good operability, the removability of slag is good.For promoting novel martensitic heat resisting steel g115 through engineering approaches to answer With providing a kind of preferable novel welding material.

Claims (4)

1. a kind of martensite heat-resistant steel welding welding rod is it is characterised in that this welding rod includes core wire, and wraps in core wire surface Coating, core wire component weight percentages are: c 0.07～0.10%；Si≤0.3%；Mn 0.3～0.7%；p≤ 0.004%；S≤0.002%；Cr 8.5～9.5%；W 2.8～3.3%；Co 2.8～3.5%；Nb 0.04～0.08%；v 0.15～0.25%；Cu 0.8～1.0%；N 0.007～0.011%；B 0.011～0.020%；Surplus fe；Above core wire In each composition total amount be 100%；Compositions of surfacing metal percetage by weight is: marble 30%～45%；Fluorite 18%～25%；Gold Red stone 5%～10%；Brium carbonate 10%～16%；Ferrotianium 5%～10%；Electrolytic manganese 1.5%～3%；Iron powder 5%～10%； Soda 0.4%～0.8%；Carboxymethyl cellulose 0.4%～0.8%；Hafnium metal powfer 0.8%～3%；Powder by mentioned component After mixing in proportion, the binding agent of total compound Ingredients Weight 16%～25% is added to be uniformly mixed；It is then fed into Wrapped on core wire in plodder, then bakeed through low temperature and high temperature,；Gravity coefficient of coating k is 30～50%.
2. novel martensitic heat resisting steel welding welding rod according to claim 1 is it is characterised in that each in described coating The weight percent content of composition in composition: caco in marble3Content >=96%, caf in fluorite2Content >=96%, rutile tio2>=96%, baco in brium carbonate3>=98%；In ferrotianium, ti contains 25～35%；Na in soda2co3>=99%；In electrolytic manganese Mn >=99.5%, cr >=98% in hafnium metal powfer.
3. martensite heat-resistant steel welding welding rod according to claim 1 is it is characterised in that the total Ingredient Wt of described addition 16%～25% binding agent is potassium-sodium water glass, its modulus 2.8～3.0, and concentration is 41 °～43 °.
4. martensite heat-resistant steel welding welding rod according to claim 1 is it is characterised in that described low temperature stoving temperature For 80 DEG C～120 DEG C；High temperature stoving temperature is 380 DEG C～450 DEG C.
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CN110508968A (en) * 2019-09-05 2019-11-29 昆山京群焊材科技有限公司 650 DEG C of ultra supercritical coal-fired unit martensite heat-resistant steel welding rods of argon filling single face welding and double face shaping are exempted from a kind of back side
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CN108188614A (en) * 2017-12-25 2018-06-22 昆山京群焊材科技有限公司 A kind of 650 DEG C of ultra supercritical coal-fired units coating transiens heat resistant steel electrode
CN109926721B (en) * 2019-04-17 2020-09-15 湖北三环锻造有限公司 Laser arc fuse welding process capable of avoiding slag inclusion
CN109926721A (en) * 2019-04-17 2019-06-25 湖北三环锻造有限公司 A kind of laser-arc fuse welding procedure avoiding slag inclusion
CN109926756A (en) * 2019-04-17 2019-06-25 湖北三环锻造有限公司 A kind of new type of electrode for soldering processes
CN110340566A (en) * 2019-06-25 2019-10-18 钢铁研究总院 A kind of nickel-base welding rod and its preparation method and application
CN110508968A (en) * 2019-09-05 2019-11-29 昆山京群焊材科技有限公司 650 DEG C of ultra supercritical coal-fired unit martensite heat-resistant steel welding rods of argon filling single face welding and double face shaping are exempted from a kind of back side
CN110508968B (en) * 2019-09-05 2021-12-31 昆山京群焊材科技有限公司 Martensitic heat-resistant steel welding rod for 650 ℃ ultra-supercritical thermal power generating unit with back surface free of argon filling and single-side welding and double-side forming
CN112536544A (en) * 2019-09-20 2021-03-23 林肯环球股份有限公司 High chromium creep resistant weld metal for arc welding of thin wall steel members
CN110936056A (en) * 2020-01-17 2020-03-31 郑州大学 Iron-based core wire coated welding rod free of being dried before welding and easy to weld
CN110936056B (en) * 2020-01-17 2021-05-25 郑州大学 Iron-based core wire coated welding rod free of being dried before welding and easy to weld
CN111590239A (en) * 2020-06-28 2020-08-28 昆山京群焊材科技有限公司 Martensite heat-resistant steel welding rod for ultra-supercritical thermal power generating unit and preparation method thereof
CN112935619A (en) * 2020-12-01 2021-06-11 四川大西洋焊接材料股份有限公司 Matched welding rod for welding martensitic steel serving at 630 ℃ for long time and preparation method thereof
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