CN101596655A - Flux-cored wire for stainless steel - Google Patents

Flux-cored wire for stainless steel Download PDF

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Publication number
CN101596655A
CN101596655A CNA2009101410939A CN200910141093A CN101596655A CN 101596655 A CN101596655 A CN 101596655A CN A2009101410939 A CNA2009101410939 A CN A2009101410939A CN 200910141093 A CN200910141093 A CN 200910141093A CN 101596655 A CN101596655 A CN 101596655A
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content
quality
welding
flux
stainless steel
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CN101596655B (en
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池田哲直
迎井直树
渡边博久
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Kobe Steel Ltd
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Kobe Steel Ltd
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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
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B23K35/0266—Rods, electrodes, wires flux-cored
    • 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
    • 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
    • B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/18—Sheet panels
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys
    • B23K2103/05—Stainless steel

Abstract

The present invention relates to a kind of flux-cored wire for stainless steel, it is filled with solder flux in the crust that is made of stainless steel, wherein, with respect to the welding wire gross mass, contain Cr:22～28 quality %, Ni:8～12 quality %, reach Fe:55～70 quality %, regulation C content is below 0.06 quality %, N content is below 0.05 quality %, be [C], when N content is [N], be 2.0～2.6 for [Ni], C content for [Mo], Ni content if Cr content is [Cr], Mo content by the Cr equivalent Eq (Cr) of following formula calculating and ratio Eq (Cr)/Eq (Ni) of Ni equivalent Eq (Ni).Eq(Cr)＝[Cr]+[Mo]，Eq(Ni)＝[Ni]+35×[C]+20×[N]。According to this formation,, can access weld metal with the high tenacity under high strength and the utmost point low temperature environment even when welding extremely thick stainless-steel sheet, also can incomplete fusion and undercut not take place in groove.

Description

Flux-cored wire for stainless steel
Technical field
The present invention relates to foot's material of spherical tank of the LNG (liquefied natural gas) that intensity and toughness required and boats and ships etc. these are made of and need the employed flux-cored wire of welding of the works of intensity and the toughness under utmost point low temperature environment stainless steel.
Background technology
Always, for the stainless steel that uses down on the foot's material that is used for the LNG spherical tank etc. and the large structure and with the state of exposed to weather, require the toughness under corrosion resistance, intensity and the utmost point low temperature environment, therefore can use stainless steel thick plate above the thickness about 20mm.Always, in the welding of such stainless steel thick plate, that carries out is to use the shielded arc welding method of electric arc rod manually to carry out, perhaps the semi-automatic gas shielded arc welding method supplied with automatically of flux-cored wire and protective gas.
But; the construction of carrying out based on shielded arc welding method and semi-automatic gas shielded arc welding method; deposition rate is little; upright operation effectiveness to welding is extremely low; therefore in the welding of shipbuilding, bridge and the chemical storage tank etc. that use the slab that constitutes by mild steel and high tension steel, can use deposition rate big, can execute upright electrogas arc welding method with efficient fruits to welding.
In the welding of utmost point slab, because groove is dark, so weld part becomes multilayer easily, defectives such as slag inclusion and undercut take place easily at this weld part.If at weld part generation slag inclusion, then the performance degradation of machineries such as the intensity of weld metal and toughness if undercut takes place, then causes fatigue strength to reduce because stress is concentrated.Therefore, it is the individual layer welding that strong hope makes the construction of carrying out based on electrogas arc welding, in addition, also wish a kind of flux-cored wire strongly, even it is when welding utmost point slab by single layer construction, fusion penetration to groove part is still good, can not access weld metal sound and that have the performance of sufficient machinery in weld part generation defective.
For example, open in flat 11-138295 number the spy and to disclose a kind of flux-cored wire for stainless steel, it is by forming in the solder flux that outer intracutaneous that tubular stainless steel constitutes fills, and contains TiO 2, SiO 2And contain the slag former of metal fluoride, by the content of specific this slag former, can upright carry out high efficiency and the welding of stable fusion penetration is arranged in that slab is stainless, in addition the weld job excellence to the position, undercut and pinhole can not take place, so the engineering properties of weld metal is good.
In addition, the electrogas arc welding that heat input is big is because it is little to reach the cooling velocity that weld metal solidifies, so the tissue of weld metal has the tendency of thickizationer.If with 308 of JISZ3323 defined is to wait the stainless steel arc welding always be used to be used for electrogas arc welding with flux-cored wire, then the weld metal tissue owing to thickization causes yield point and tensile strength to reduce greatly.Open disclosed flux-cored wire for stainless steel in flat 11-138295 number according to the spy, disclosed is to add N or metal nitride in crust and/or filling flux, by specific its addition, 0.2% yield strength can either be guaranteed, the problems such as increase of the pointed pore generation or the generating capacity that splashes can be suppressed again.
Yet, in aforesaid prior art, have following problem points.
If a large amount of N that add in flux-cored wire for stainless steel, then the toughness of the welding portion under the utmost point low temperature environment reduces.Te Kaiping 11-138295 number described flux-cored wire for stainless steel adds N or metal nitride in crust and/or filling flux in order to ensure 0.2% yield strength, but its addition is 0.05～0.16 quality % nearly, toughness under the utmost point low temperature environment reduces, therefore be unsuitable for LNG with etc. the welding of the works that under utmost point low temperature environment, uses of quilt.
In addition, in the spy opens flat 11-138295 number described embodiment, disclose the SUS304 steel plate of use thickness of slab 20mm and the soldering test of SUS316 steel plate, but in the welding of thickness of slab above the stainless-steel sheet of 20mm, even use this flux-cored wire for stainless steel, still keep away incomplete fusion unavoidably takes place in groove.
Summary of the invention
The present invention does in view of such problem points, its purpose is, a kind of flux-cored wire for stainless steel is provided, even when welding extremely thick stainless-steel sheet, can incomplete fusion and undercut not take place in groove, can access the weld metal with the high tenacity under high strength and the utmost point low temperature environment yet.
Flux-cored wire for stainless steel of the present invention is the flux-cored wire for stainless steel that filling flux forms in the crust that is made of stainless steel, with respect to the welding wire gross mass, contains Cr:22～28 quality %, Ni:8～12 quality %, CaF 2: 1.0～2.0 quality % and Fe:55～70 quality %, regulation C content is below 0.06 quality %, N content is below 0.05 quality %, be [C], when N content is [N], be 2.0～2.6 for [Ni], C content for [Mo], Ni content if Cr content is [Cr], Mo content by the Cr equivalent Eq (Cr) of following formula calculating and ratio Eq (Cr)/Eq (Ni) of Ni equivalent Eq (Ni).
[formula 1]
Eq(Cr)＝[Cr]+[Mo]
[formula 2]
Eq(Ni)＝[Ni]+35×[C]+20×[N]
In addition, described solder flux preferably contains slag former 1.5～2.5 quality % with respect to the welding wire gross mass.At this, in the slag former flux constituent that intracutaneous is filled outside, remove beyond the metal dust of alloying component that Fe, Cr, Ni and Mn etc. constitute weld metals, also comprise with final slag and form relevant whole raw material, also comprise with arc stability and turn to purpose and the composition that adds.CaF 2Also the part as slag former is contained.The form that each composition of slag former exists as flux constituent also can be compounds such as oxide, fluoride, carbon oxonium salt, silicate, carbide and nitride.
Described in addition solder flux also contains TiO 2, SiO 2And ZrO 2In at least one, CaF 2Content is with respect to TiO 2, SiO 2And ZrO 2The ratio of the summation of content is preferably more than 5.0.
According to the present invention, in flux-cored wire for stainless steel, contain Cr in the welding wire by making, make the weld metal solution strengthening, in addition specific to the Cr content in the welding wire simultaneously, thus ductility and toughness are reduced.In addition, can suppress the reduction of the toughness under resistance to impact and the low temperature environment by restriction in austenite stainless steel as the C of intrusion type element and the content of N.In addition, the distribution of Cr equivalent and Ni equivalent by the metallic element in the certain wire, structural equation in the weld metal is suitably changed, toughness under ductility and the low temperature environment is reduced, yield point and tensile strength are improved, therefore even in the time of accessing a kind of welding that is used to the works that under utmost point low temperature environment, uses, the flux-cored wire for stainless steel silk that still has the characteristic of excellent machinery.
Description of drawings
Fig. 1 is the profile of the welding wire used of expression electrogas arc welding.
Fig. 2 vertically reaches the stereogram that horizontal direction is cut the weld part that shows electrogas arc welding.
The specific embodiment
Fig. 1 is the profile of the welding wire used of expression electrogas arc welding, and Fig. 2 is the stereogram that shows the weld part of electrogas arc welding with the section of a part of vertical direction and horizontal direction.
As shown in Figure 2, electrogas arc welding is carried out in the following way, on the groove 6 of 5 of mother metals liner 3 is set to posture by upright, in operator's side slip copper coin 2 is set again, supply with welding wire 11 by welding torch 13 to groove 6, take place at weld metal 43 and welding wire 11 chien shih arc discharges simultaneously.Protective gas is fed into weld part from the gas supply port 22 of being located at slip copper coin 2, by covering electric arc 12 and weld part 4 by this protective gas, can prevent invading air in the welding atmosphere.Slip copper coin 2 in addition, is provided with the cooling tube 23 of circulation cooling water along with moving of weld part 4 slides up and down together in this slip copper coin 2, utilize the water of circulation in cooling tube 23 to cool off weld parts 4 via slip copper coin 2.
Welding wire 11 is made of the crust 11a of tubulose and the solder flux 11b that is filled in the inside of crust 11a as shown in Figure 1.Crust 11a is a stainless steel, its base material is made of the metal identical with the mother metal of welding object, for the stabilisation of organizing that makes weld metal, improve yield point, tensile strength and the such engineering properties of toughness, the character that perhaps improves the chemistry of corrosion resistance etc. is purpose, and this base material contains compositions such as C, Ni, Cr, Si, Mo.In addition, compositions such as this C, Si also are present among the solder flux 11b as monomer or compound except being the composition in the stainless steel of crust 11a, and crust 11a and these both sides of solder flux 11b are fed into weld part 4.
Flux-cored wire for stainless steel of the present invention with respect to the welding wire gross mass, contains Cr:22～28 quality %, Ni:8～12 quality % and Fe:55～70 quality %.In addition, the C content that welding wire contains is controlled at below the 0.06 quality %, and N content is controlled at below the 0.05 quality %.In addition, if the Cr content in the welding wire is that [Cr], Mo content are that [Ni], C content are for [C], when N content is [N] for [Mo], Ni content, during by Cr equivalent Eq (Cr) in following formula 3 and the 4 definition welding wires and Ni equivalent Eq (Ni), the ratio Eq (Cr) of Cr equivalent Eq (Cr) and Ni equivalent Eq (Ni)/Eq (Ni) is 2.0～2.6.
[formula 3]
Eq(Cr)＝[Cr]+[Mo]
[formula 4]
Eq(Ni)＝[Ni]+35×[C]+20×[N]
At weld part 4, by heat input from arc discharge, mother metal 5 and welding wire 11 fusions and form fusing department 41.Solder flux 11b also forms welding slag 42 by slag former contained in the solder flux except generate arc atmosphere as gas generation source, thus the chilling of the additional and motlten metal of the deoxygenation refining in the mitigation weld part 41, alloying component.The slag 42 that floats from the fusing department 41 of weld part 4 flows between weld metals and the slip copper coin 2, lining welding bead surface and the blocking atmosphere forms level and smooth welding bead.Flux-cored wire for stainless steel of the present invention with respect to the welding wire gross mass, contains slag former 1.5～2.5 quality %.Also have, in the flux constituent of this slag former intracutaneous outside being filled into, remove beyond the metal dust of alloying component that Fe, Cr, Ni and Mn etc. constitute weld metals, also comprise with final slag and form relevant whole raw material, also comprise with arc stability and turn to purpose and the composition that adds.Each composition of this slag former also can be compounds such as oxide, fluoride, carbonate, silicate, carbide and nitride as the form that flux constituent exists.
The fusing point of stainless weld metal is 1400～1500 ℃, compares low about 100 ℃ with general mild steel.Therefore, in stainless electrogas arc welding, weld metal begins to solidify slowly, and the difference that slag 42 and fusing department 41 begin moment of solidifying separately is bigger than mild steel.And if the slag composition of floating from fusing department 41 can not add the slag 42 that begins to solidify, then slag composition is mingled with in the fusing department 41, can not remove the slag composition that this is mingled with.
Discoveries such as present inventor are conceived to CaF as being lower than the slag fusing point near the composition of the slag slag making material of stainless fusing point 2, by adjusting the CaF in the welding wire 2Even content when surpassing the slab of 20mm with electrogas arc welding welding, can not make weld part generation incomplete fusion and slag inclusion yet, can form welding bead attractive in appearance, thereby find the present invention.Flux-cored wire for stainless steel of the present invention with respect to the welding wire gross mass, contains CaF 2Be 1.0～2.0 quality %.Also have, what the present invention relates to is to be crust with stainless hoop material, by the flux-cored wire that obtains at this inside filling flux that binds round material, but use the line footpath of welding wire respectively according to the current range that is used to weld from thin footpath to particle size, if general employed 1.0～2.0mm in the semi-automatic welding then all can be suitable for the present invention.
Below, the reason of the numerical definiteness of forming with regard to welding wire of the present invention describes.
(Cr:22～28 quality %)
Cr forms the inertia epithelium on the surface of stainless steel alloy steel, improves the corrosion resistance at atmosphere or acid.In addition, Cr has solid solution strengthening effect for iron, and therefore if add Cr, then yield point and tensile strength improve.For the interpolation by Cr obtains the effect of the solution strengthening of weld metal, need make the Cr content in the weld metal is more than the 20 quality %.Because the Cr that is added is oxidized in addition as slag consumption by the fusion of mother metal dilution, cause the content of the Cr of solid solution in the weld metal to reduce, therefore can make the Cr content in the welding wire is more than the 22 quality %.On the other hand, if the Cr content in the welding wire surpasses 28 quality %, then the ferritic structure in the weld metal too much and ductility reduces is separated out in weld metal based on the intermetallic compound of Fe, Cr, and toughness and ductility reduce easily.Therefore, the Cr content in the welding wire is 22～28 quality %, more preferably 22～26 quality %.
(Ni:8～12 quality %)
Ni is the effective composition that is used for making at the solidified structure of weld metal austenite formation, and weld metal is improved at the corrosion resistance of non-oxidizing acid.As electrogas arc welding, thickness of slab according to the mother metal that is welded, heat input to weld part can be greatly different, in addition, in the different welding of the dilution rate of the mother metal of fusing department along with the variation of heat input, if Ni amount contained in the welding wire is lacked than Ni amount contained in the mother metal, then the amount of the Ni in the weld metal will be lacked than mother metal, so the corrosion resistance of weld metal reduces than mother metal.If the Ni content in the welding wire is lower than 8 quality %, then the amount of the Ni in the weld metal is lacked and the corrosion resistance reduction than mother metal.On the other hand, if Ni content surpasses 12 quality % in the welding wire, then in the solidified structure of weld metal the balance of contained ferrite and austenite structure because very cataclysm takes place in the dilution rate of mother metal, thereby can not stablize the engineering properties of acquisition weld metal.Therefore, the Ni content in the welding wire is 8～12 quality %.
(Fe:55～70 quality %)
Fe is the stainless surplus that contains above-mentioned Cr and Ni composition.Flux-cored wire for stainless steel of the present invention except that Cr and Ni, also contains slag former, C, N, Mo or unavoidable impurities.Therefore, the Fe content in the welding wire is 55～70 quality %.
(Cr equivalent Eq (Cr) is for ratio Eq (Cr)/Eq (Ni) of Ni equivalent Eq (Ni): 2.0～2.6)
By the ratio of the Cr equivalent Eq (Cr) in the certain wire for Ni equivalent Eq (Ni), the structural equation in the weld metal is suitably changed.At this, the pairing composition of the Cr equivalent in the welding wire promotes the formation of the ferritic structure in the weld metal, and the pairing composition of Ni equivalent promotes the formation of the austenite structure in the weld metal.In the present invention, consider welding can cause in the welding wire to contain metal diluted etc., and the Cr equivalent and the Ni equivalent that come certain wire to contain according to following formula 5 and 6, the ferritic structure in the weld metal and the ratio that contains of austenite structure are suitably changed, even thereby in the such weld metal that under large-line energy, generates of electrogas arc welding, also can access yield point and the tensile strength equal with mother metal.If the Cr equivalent in the welding wire is lower than 2.0 for the ratio of Ni equivalent, then the austenite structure in the weld metal increases, and yield point and tensile strength reduce.On the other hand, if the Cr equivalent in the welding wire surpasses 2.6 for the ratio of Ni equivalent, then the ferritic structure in the weld metal increases, and ductility and toughness reduce.Therefore, the Cr equivalent in the welding wire is 2.0～2.6 for the ratio of Ni equivalent.
[formula 5]
Eq(Cr)＝[Cr]+[Mo]
[formula 6]
Eq(Ni)＝[Ni]+35×[C]+20×[N]
(C:0.06 quality % is following)
C is included in crust, the solder flux raw material of welding wire and coats in the lubricant of welding wire surface.In addition, the CO in the protective gas 2Reduced by arc discharge, the C that is reduced also can join in the weld metal.If add C, then its in austenite stainless steels such as SUS304L as intrusion type element solid solution, though the yield point of weld metal and tensile strength increase, along with the increase of its addition, the Cr carbide begins to separate out in the weld metal, so the toughness under the low temperature environment reduces.If the content of the C in the welding wire surpasses 0.06 quality %, then the toughness under resistance to impact and the low temperature environment significantly reduces.Therefore, the content of the C in the welding wire is below the 0.06 quality %, more preferably below the 0.02 quality %.
(N:0.05 quality % is following)
N is included among the crust of welding wire and solder flux raw material etc.Therefore the same with C, as intrusion type element solid solution, along with the increase of the addition of N, the yield point of weld metal and tensile strength increase N, the toughness reduction resistance to impact and low temperature environment under in austenite stainless steel.In addition, if the addition of N is many, then the N of gas is discharged in the weld metal, and gas hole defects such as pore and pinhole will take place easily.If the content of the N in the welding wire surpasses 0.05%, then the toughness under resistance to impact and the low temperature environment reduces, and gas hole defect takes place in addition easily.Therefore, the content of the N in the welding wire is below the 0.05 quality %, more preferably below the 0.03 quality %.
Flux-cored wire of the present invention except that above-mentioned Cr, Ni, Fe, C and N, can also contain Mo with the rising to purpose of corrosion resistance.But, if the content of the Mo in the welding wire surpasses 1.0 quality %, compound between precipitating metal in the weld metal then, the toughness reduction of the weld part low temperature environment under.Therefore, the Mo content in the preferred welding wire is suppressed at below the 1.0 quality %.
(slag former adds up to: 1.5～2.5 quality %)
In the welding wire among the contained flux constituent, the effect that slag former has is, in electrogas arc welding, floats to weld metal top by arc heat with molten condition, carries out the deoxygenation refining of motlten metal simultaneously and relaxes the chilling of motlten metal.If the total of the slag former in the welding wire is lower than 1.5 quality %, then can't fully obtain above-mentioned effect, incomplete fusion takes place easily.On the other hand, if the total of the slag former in the welding wire surpasses 2.5 quality %, then the slag of Fa Shenging is too much, and arc discharge brings spatters slag and increasing of splashing, so the outward appearance of welding bead is impaired easily.In addition, arc discharge interrupts easily, and therefore slag inclusion and pinhole and pore etc. in the weld metal take place easily.Therefore, the slag former in the welding wire adds up to 1.5～2.5 quality %.
(CaF 2: 1.0～2.0 quality %)
Among the slag former, CaF 2Reduce the fusing point of slag and make it approaching stainless fusing point, its effect that has is, even when the stainless-steel sheet of this utmost point slab in the welding 60mm left and right sides, also can suppress the defectives such as slag inclusion of generation in the groove, thereby can obtain good weld job and sound weld metal.Present inventors etc. among the contained composition, are conceived to this CaF in slag former 2Content, study its addition and add ratio, it found that, by making CaF 2Addition be 1.0～2.0 quality %, can access good weld job and sound weld metal.If this CaF 2Content be lower than 1.0 quality %, then can't fully obtain to reduce the effect of the fusing point of slag, slag inclusion and incomplete fusion take place easily, in addition because the slag of inhomogeneous generation also can cause the welding bead outward appearance impaired easily.On the other hand, if CaF 2Content surpass 2.0 quality %, then in existing solder flux as the SiO of principal component 2And TiO 2Deng the composition deficiency, so the reduction of the high temperature viscosity of slag, make the welding bead surface produce uneven weld ripples, and the slag fissility reduce.So CaF in the welding wire 2Content be 1.0～2.0 quality %.In addition, in the welding wire among the contained slag former, TiO 2, SiO 2And ZrO 2Though have the effect of the flowability that improves slag, can be as small composite oxides field trash dispersion, residual in solidifying the weld metal that finishes, soak at weld metal that the defective as point-like is measured in the crank detection test.Therefore, preferably its total content compares CaF 2Poor aspect.If the CaF in the welding wire 2Content with respect to TiO 2, SiO 2And ZrO 2The ratio meter of the summation of content is lower than 5.0, and the defective of the point-like that then is detected in soaking into crank detection test can significantly increase.Therefore, the CaF in the preferred welding wire 2Content with respect to TiO 2, SiO 2And ZrO 2The ratio of the summation of content is more than 5.0, more preferably more than 15.0.
[embodiment]
Below, will demonstrate the embodiment of effect of flux-cored wire of the present invention with the comparative example illustration.
Be manufactured on the welding wire that is filled with solder flux in the hoop material that SUS304L constitutes, use this welding wire to carry out electrogas arc welding.The composition and the size of sheet material that is used for the manufacturing of this hoop material is presented at table 1.
Mother metal uses the slab of the thickness of slab 50mm that is made of the stainless steel that contains the composition shown in the table 2, with the join groove of the V font that dispose these two slabs of groove gap 5mm, at the liner of the rear side configuration pottery manufacturing of mother metal.Also have, the angle that the groove of V word constitutes between the mother metal that joins is 20 °, and this V word groove is supplied with CO 2Or Ar-20%CO 2As protective gas, carry out electrogas arc welding simultaneously.Welder is set at the welding condition of 400A-43V with direct current reversed polarity (DC-EP), and the flow of protective gas is the 35L/ branch.
[table 1]
Size C Si Mn P S Cr Ni Mo Nb N
Thick 0.6mm * wide 15mm 0.018 0.48 1.2 0.027 0.008 18.8 8.3 0.1 0.01 0.015
[table 2]
Size C Si Mn P S Cr Ni Mo Nb N
Thick 50mm 0.045 0.62 1.35 0.024 0.006 18.15 8.23 0.2 0.01 0.04
In having the hoop material of the composition shown in the table 1, fill solder flux with various compositions, as the flux-cored wire of embodiment and comparative example for the examination material, carry out electrogas arc welding for the mother metal shown in the table 2.Then,, carry out longitudinal stretching and test the V otch pendulum impact test that reaches under-196 ℃ of environment, measure 0.2% yield strength, tensile strength and absorb energy for the weld metal that the welding wire that uses embodiment and comparative example has carried out welding.Then, if 0.2% yield strength is 280[N/mm 2] above, tensile strength is 580[N/mm 2] above, absorb can be 34[J] more than, then the project of each performance is judged to be well.What satisfy whole projects is zero, ungratified project have 1 for * and be presented in the table 3.
About the viability of weld metal, be for the welding bead outward appearance, have or not incomplete fusion and have or not slag inclusion to estimate judgement.The welding bead outward appearance is estimated by range estimation, does not consequently have slag to be mingled with, and what form level and smooth welding bead is good.In addition, by X ray transmission test, judge that according to the size and the number of incomplete fusion and slag inclusion zero defect is arranged, what do not have defective fully is good.About the result of determination that has or not of welding bead outward appearance, incomplete fusion and slag inclusion, good is zero, with existing be equal to for △ and be presented in the table 3.
[table 3-1]
Figure A20091014109300121
[table 3-2]
[table 3-3]
Figure A20091014109300131
[table 3-4]
Figure A20091014109300132
Embodiment that must important document of the present invention is satisfied in No.1 shown in the table 3～7,9,10, the 17th.Cr, Ni, CaF in embodiment No.1～7,9,10,17 welding wires 2, the content of C and N and Cr equivalent satisfy scope of the present invention for the ratio of Ni equivalent, demonstrates excellent yield point and tensile strength, can access the good toughness that can judge according to absorbing.
No.11 is that the Cr content in the welding wire is lower than scope of the present invention, thereby can not get the comparative example from the effect of the solution strengthening of the interpolation of Cr.No.12 is that the Cr content in the welding wire surpasses scope of the present invention, because the increase of the ferritic structure of the surplus in the weld metal causes tensile strength to reduce, causes the comparative example of toughness reduction in addition owing to separating out of intermetallic compound.To be Cr equivalent contained in the welding wire be lower than scope of the present invention for the ratio of Ni equivalent to No.13, because the comparative example that the increase of the austenite structure in the weld metal causes tensile strength to reduce.Contained Cr equivalent surpasses scope of the present invention with respect to the ratio of Ni equivalent in the comparative example No.14 welding wire, because the increase of the ferritic structure in the weld metal causes toughness to reduce.The content of C in the comparative example No.15 welding wire surpasses scope of the present invention, and toughness reduces.The content of N in the comparative example No.16 welding wire surpasses scope of the present invention, and toughness reduces.
Among embodiment No.1～7,9,10,17 of satisfying necessary important document of the present invention, the slag former content in embodiment No.1～6 welding wires satisfies scope of the present invention, has perfect welding bead outward appearance, and slag inclusion and incomplete fusion do not take place in the weld metal.Though No.7 satisfies condition of the present invention, contain CaF among the slag former 2Ratio less, therefore be under the effect of the composition beyond slag former, welding bead outward appearance and the existing example that is equal to.
CaF in the embodiment No.8 welding wire 2Content is lower than scope of the present invention, can't fully obtain to reduce the effect of slag fusing point, and the generation of incomplete fusion and welding bead outward appearance are equal to existing.CaF in the No.17 welding wire 2Content is many, and the welding bead outward appearance has some deteriorations.The content of the slag former in the No.9 welding wire is many, and it is too much that slag takes place, the appearance damage of welding bead, also be in addition slag inclusion take place with the existing example that is equal to.No.10 is because the slag deficiency causes the chilling of weld part not obtain relaxing, and incomplete fusion takes place to be equal to existing.

Claims (3)

1. flux-cored wire for stainless steel, its filling flux in the crust that is made of stainless steel forms, it is characterized in that,
With respect to the welding wire gross mass, contain Cr:22～28 quality %, Ni:8～12 quality %, CaF 2: 1.0～2.0 quality % and Fe:55～70 quality %,
And, C content is defined in below the 0.06 quality %, N content is defined in below the 0.05 quality %,
Cr content is being decided to be [Cr], Mo content is decided to be [Mo], Ni content is decided to be [Ni], C content is decided to be [C], when N content was decided to be [N], the Cr equivalent Eq (Cr) that calculates according to following formula and ratio Eq (Cr)/Eq (Ni) of Ni equivalent Eq (Ni) were 2.0～2.6,
Eq(Cr)＝[Cr]+[Mo]
Eq(Ni)＝[Ni]+35×[C]+20×[N]。
2. flux-cored wire for stainless steel according to claim 1 is characterized in that, described solder flux contains the slag former of 1.5～2.5 quality % with respect to the welding wire gross mass.
3. flux-cored wire for stainless steel according to claim 1 is characterized in that described solder flux contains TiO 2, SiO 2And ZrO 2In at least a, CaF 2Content is with respect to TiO 2, SiO 2And ZrO 2The ratio of the summation of content is more than 5.0.
CN2009101410939A 2008-06-03 2009-05-20 Flux-cored wire for stainless steel Expired - Fee Related CN101596655B (en)

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