CN106994570B - Stainless flux-cored wire - Google Patents

Stainless flux-cored wire Download PDF

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Publication number
CN106994570B
CN106994570B CN201610955632.2A CN201610955632A CN106994570B CN 106994570 B CN106994570 B CN 106994570B CN 201610955632 A CN201610955632 A CN 201610955632A CN 106994570 B CN106994570 B CN 106994570B
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mass
welding
less
flux
content
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CN106994570A (en
Inventor
菅原大志
福田和博
池田哲直
西山繁树
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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
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/308—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
    • B23K35/3607—Silica or silicates
    • 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
    • B23K35/3608—Titania or titanates
    • 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
    • B23K35/361—Alumina or aluminates
    • 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
    • B23K35/365—Selection of non-metallic compositions of coating 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
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

A kind of tensile strength, the toughness under low temperature, anti-defective and the anti-thread breakage excellent stainless flux-cored wire of heat resistanceheat resistant are provided.A kind of stainless flux-cored wire, it is characterized in that, in welding wire gross mass, contain C:0.04 mass % or less, Si:0.8 mass % or less, mass %, the Cu:3.0 mass of Mn:0.5~5.0 % or less, mass %, Cr:15 of Ni:13~33~29 mass %, Mo:2.0~6.0 mass %, Nb:1.0 mass % or less and the mass of N:0.08~0.25 %, furthermore in the solder flux, in terms of welding wire gross mass, also contain TiO2: 4.0~12.0 mass %, SiO2: 0.05~3.0 mass %, ZrO2: 0.5~5.0 mass %, Al2O3: 2.0 mass % or less, the Bi scaled value for Bi compound: 0.01 mass % or less, for alkali metal compound alkali metal scaled value it is total: 0.1~2.0 mass % and for the fluorine scaled value of fluoride: 0.1~1.0 mass %.

Description

Stainless flux-cored wire
Technical field
The present invention relates to complete austenite group is used as used in the welding in the stainless steel and 5%Ni steel etc. of low temperature applications The stainless flux-cored wire knitted.
Background technique
The welding of the stainless steel of corrosion resistance and heat resistance that stainless steel welding material be used to have excellent, in various works Industry field is widely used.On the other hand, the weldering of 5%Ni steel used in the structural elements for storage tank as LEG etc. etc. Material is connect, requirement that having the impact property under high-strength characteristic and low temperature, so using Ni based alloy welding material more.
Because existing stainless steel welding material is not able to satisfy the specification of intensity and impact property, in 5%Ni steel It is almost not used by welding.
Such as in patent document 1, a kind of low-temperature steel welding Ni based alloy with excellent mechanical performance is disclosed Flux-cored wire.
In addition, in patent document 2, disclosing a kind of for the extremely low of stainless steel used in superconducting coil works The excellent extremely low temperature stainless steel coated electrode of impact property under temperature.
[existing technical literature]
[patent document]
[patent document 1] Japanese Unexamined Patent Publication 2001-334392 bulletin
[patent document 2] Japanese Unexamined Patent Publication 07-124784 bulletin
But Ni based alloy flux-cored wire disclosed in patent document 1, compared with stainless steel, because Ni, Cr, Mo etc. Alloy content is high, so at high cost.In addition, stainless steel coated electrode disclosed Patent Document 2, strength characteristics at room temperature is not Sufficiently, in addition, welding efficiency is low because being coated electrode.
Summary of the invention
In view of above-mentioned actual conditions, in the present invention, it is intended that a kind of stainless flux-cored wire is provided, low It is low cost compared with Ni based alloy in the welding of the austenite stainless steel and 5%Ni steel of warm purposes, it is high in welding efficiency In stainless flux-cored wire, the excellent welding metal of impact property under tensile strength and low temperature can be obtained.
More specifically, in the present invention, it is intended that provide a kind of austenite stainless steel in low temperature applications and Stainless flux-cored wire used in the welding of 5%Ni steel etc. is toughness under tensile strength, low temperature, anti-defective and anti- The excellent stainless flux-cored wire of fire check.
The result of the present inventors' sharp study repeatedly, it was found that item below.
That is, when welding metal is two phase constitution of the austenite ferrite containing ferritic structure, at low temperature, iron element Mutually embrittlement, impact property significantly deteriorate body.Therefore, for the purpose of low-temperature flexibility required by the welding metal for reaching 5%Ni steel, In the present invention, the adjustment of the chemical component of welding metal is carried out in a manner of becoming complete austenite structure.
When as complete austenite structure, project is to be easy to happen fire check.In order to reduce fire check sensibility, it is known that be Reduce the impurity for generating P, S of low-melting compound etc..
The Bi added generally for the purpose of the slag fissility for improving slag system flux-cored wire, in addition also confirming can generate Low melting point oxide improves fire check sensibility, so not adding Bi as far as possible in the present invention.
Only by reducing P and S and not adding Bi, the improvement anti-thread breakage for heat resistanceheat resistant is simultaneously insufficient, therefore in the present invention In, also it is conceived to the influence of various alloying elements.
In the final resolidified region of welding metal, it is believed that alloying element is thickened due to solidifying segregation, makes molten metal Fusing point reduce and improve fire check sensibility.It is studied in the present invention with microstructure observation and Thermodynamic Simulation, Influence for alloying element carries out tune Check.
Itself as a result, it has been found that, Si has the segregation of the alloying element of C, Cr and Mo in final resolidified region solidifying segregation etc. There is facilitation effect, by inhibiting very low the additive amount of Si, it is anti-thread breakage heat resistanceheat resistant can be effectively improved.
In addition, Mn generates MnS known to generally, it is to improve the anti-thread breakage element of heat resistanceheat resistant, as complete austenite structure Addition 5~7% (referring to Japanese Unexamined Patent Publication 07-124784 bulletin) etc. in flux.
But superfluous addition can promote the solidifying segregation of Mn itself, the fusing point for incurring final resolidified region reduces, instead Make the anti-thread breakage deterioration of heat resistanceheat resistant.Thus, it is found that needing to make the content of Mn lower in the present invention and being adjusted to range appropriate.
In addition, it is found that in the present invention, in order to improve the tensile strength as the welding metal of complete austenite structure, Work will largely be added to obtain high-tensile at room temperature by effectively adding the calkings type solution strengthening elements such as C and N For the N of solution strengthening element.In addition, C is to improve fire check sensibility to have element, therefore add N's in the present invention to be positive Design.
But if increasing the additive amount of N, in welding metal solidification, due to reaching the hair of bubble caused by oversaturated N It is raw, it is known that the occurrence risk of stomata pit improves.Therefore in the present invention, by making the TiO in solder flux2、ZrO2、SiO2、 Al2O3Deng slag form optimize, reduce gas hole defect occur risk on be succeeded.
Obtain above-mentioned conclusion, the present inventors reach the above subject by adjusting the chemical component of welding metal Furthermore low-temperature flexibility required by welding metal makes the additive amount of the alloying element of C, Si, Mn and Cr, Mo etc. in specific model It encloses, to be succeeded in terms of the anti-thread breakage improvement of good heat resistanceheat resistant.Furthermore by forming the slag in N and solder flux in spy Fixed range had not only been successfully realized high-tensile at room temperature, but also risk (the anti-defect for successfully inhibiting gas hole defect to occur Property), so as to complete the present invention.
That is, the present invention relates to the following contents.
[1] a kind of stainless flux-cored wire, which is characterized in that be the stainless steel that solder flux is filled in the crust of stainless steel Flux-cored wire,
In welding wire gross mass, contain
C:0.04 mass % or less,
Si:0.8 mass % or less,
The mass of Mn:0.5~5.0 %,
Cu:3.0 mass % or less,
The mass of Ni:13~33 %,
The mass of Cr:15~29 %,
The mass of Mo:2.0~6.0 %,
Nb:1.0 mass % or less and
The mass % of N:0.08~0.25,
Furthermore in the solder flux, in welding wire gross mass, also contain
TiO2: 4.0~12.0 mass %,
SiO2: 0.05~3.0 mass %,
ZrO2: 0.5~5.0 mass %,
Al2O3: 2.0 mass % or less,
For the Bi scaled value of Bi compound: 0.01 mass % or less,
For the alkali metal compound being made of Na, K and Li alkali metal scaled value it is total: 0.1~2.0 mass %, And
For the fluorine scaled value of fluoride: 0.1~1.0 mass %.
[2] stainless flux-cored wire described according to [1], which is characterized in that the content of each ingredient contained by welding wire Meet following relational expressions.
A/B≥1.4
A=Ni+30 × (C+N)+0.5 × Mn+12.4
B=Cr+Mo+1.5 × Si+0.5 × Nb
Stainless flux-cored wire according to the present invention, in extremely low temperature stainless steel, 5%Ni steel and highly corrosion resistant austenite In the all-position welding of stainless steel etc., it can obtain that there is good tensile strength, low-temperature flexibility, anti-defective, heat resistanceheat resistant crackle The welding metal of property.
In addition, by the oxide and carbonate added and as slag forming agent, it is specified that the oxygen of Ti, Si, Zr, Al Compound amount, can obtain comprehensive flat weld bead shape, and slag fissility is also good.
Specific embodiment
Hereinafter, being illustrated in detail with regard to mode for carrying out the present invention.In addition, the present invention is not by described below Embodiment.
Flux-cored wire of the invention, which is characterized in that be the stainless steel medicine core that solder flux is filled in the crust of stainless steel Welding wire, it is specified that amount is being welded furthermore in the solder flux containing C, Si, Mn, Cu, Ni, Cr, Mo, Nb and N in welding wire gross mass In silk gross mass, also contained with specified amount by TiO2、SiO2、ZrO2、Al2O3, Bi compound, Na, K and Li constitute alkali metal Close object and fluoride.
Hereinafter, illustrating the content in welding wire gross mass for each ingredient of flux-cored wire of the invention.
< C:0.04 mass % or less >
C is the element for improving the tensile strength of welding metal, on the other hand, also can be in the final solidification portion of welding metal Segregation, reduces the fusing point of melt, makes the anti-thread breakage deterioration of heat resistanceheat resistant.Therefore, the additive amount by it in welding wire gross mass inhibits 0.04 mass % or less.If C content is higher than 0.04 mass %, fire check sensibility is high.Additionally, it is preferred that for 0.03 mass % with Under.Alternatively, it is also possible to be free of C, but in order to ensure intensity, 0.01 mass % or more is preferably comprised.
< Si:0.8 mass % or less >
Si is also segregated in the final solidification portion of welding metal, is reduced the fusing point of melt, is made the anti-thread breakage deterioration of heat resistanceheat resistant, therefore Additive amount is inhibited below 0.8 mass %.If Si content is higher than 0.8 mass %, solidifying segregation promotes, fire check sensibility It is high.Additionally, it is preferred that being 0.6 mass % or less.Alternatively, it is also possible to be free of Si, but in order to ensure the intensity and low temperature of welding metal Toughness inhibits stomata etc., preferably comprises 0.2 mass % or more.
The mass % of < Mn:0.5~5.0 >
Mn has the effect of stomata (BH) caused by inhibiting oxygen system gas using deoxidation effect, and with making austenite The effect of tissue stabilization, therefore add.When Mn additive amount is lower than 0.5 mass %, it cannot get sufficient deoxidation effect.Another party Face makes melt if Mn content is higher than 5.0 mass %, Mn and is promoted to the solidifying segregation of the final resolidified region of welding metal Fusing point reduces, and is easy to happen fire check.Therefore, the Mn content in flux-cored wire is 0.5~5.0 matter in welding wire gross mass Measure %.Additionally, it is preferred that being 1.0 mass % or more, preferably 4.0 mass % or less.
< Cu:3.0 mass % or less >
If its content of Cu is higher than 3.0 mass %, make the anti-thread breakage deterioration of heat resistanceheat resistant, therefore is 3.0 matter in welding wire gross mass Measure % or less.Preferably 2.5 mass % or less.Lower limit does not have special provision, or make austenite structure stabilize and Add Cu.
The mass % of < Ni:13~33 >
Ni is added in order to stabilize austenite structure.When Ni content is lower than 13 mass %, austenite structure is unstable. On the other hand, if solid solubility of the Ni content higher than 33 mass %, C and N reduces, BH is easy to happen.Therefore, in flux-cored wire Ni content is 13~33 mass % in welding wire gross mass.Ni content is preferably 14 mass % or more.Additionally, it is preferred that being 30 matter Measure % or less.
The mass % of < Cr:15~29 >
Cr, which has, improves the intensity of welding metal, and makes the stabilized effect of austenite phase.Cr content is lower than 15 matter When measuring %, it cannot get sufficient intensity.On the other hand, if Cr content is higher than 29 mass %, the toughness of welding metal is deteriorated, and And the solidifying segregation of Cr is promoted, the anti-thread breakage deterioration of heat resistanceheat resistant.Therefore, the Cr content in flux-cored wire is in welding wire gross mass 15~29 mass %.Cr content is preferably 17 mass % or more.Additionally, it is preferred that being 27 mass % or less.
The mass % of < Mo:2.0~6.0 >
Mo is identical as Cr, has the effect of making the intensity of welding metal to improve.When Mo content is lower than 2.0 mass %, obtain not To sufficient intensity.On the other hand, if Mo content is higher than 6.0 mass %, the toughness of welding metal is deteriorated, and the solidification of Mo Segregation is promoted, the anti-thread breakage deterioration of heat resistanceheat resistant.Therefore, the Mo content in flux-cored wire is 2.0~6.0 matter in welding wire gross mass Measure %.Mo content is preferably 2.5 mass % or more.Additionally, it is preferred that being 5.0 mass % or less.
< Nb:1.0 mass % or less >
Nb has the effect of making the intensity of welding metal to improve, therefore can also add, if but be higher than 1.0 mass %, Then make the anti-thread breakage deterioration of heat resistanceheat resistant.Therefore, the Nb content in flux-cored wire is 1.0 mass % or less.Preferably 0.8 mass % with Under.Lower limit does not have special provision.
The mass % of < N:0.08~0.25 >
N is solution strengthening element, has the effect of making the intensity of welding metal to improve.When N content is lower than 0.08 mass %, It cannot get sufficient intensity.On the other hand, if N content is higher than 0.25 mass %, it is easy to happen BH.Therefore, the N in flux-cored wire Content is 0.08~0.25 mass % in welding wire gross mass.N content is preferably 0.10 mass % or more.Additionally, it is preferred that being 0.20 mass % or less.
In addition, the content of each ingredient included in welding wire, in order to obtain complete austenite structure and preferably satisfy following Relational expression.
A/B≥1.4
A=Ni+30 × (C+N)+0.5 × Mn+12.4
B=Cr+Mo+1.5 × Si+0.5 × Nb
Ni equivalent is meant by the formula that A is indicated herein, Cr equivalent is meant by the formula that B is indicated.That is, being indicated by A/B Value reach 1.4 or more, become as complete austenite structure, therefore preferably.In addition, A/B is more preferably 1.5 or more, further Preferably 1.6 or more.
In addition, hereinafter, illustrating each ingredient in the solder flux of stainless flux-cored wire of the invention, in welding wire gross mass Content.
< TiO2: 4.0~12.0 mass % > are accounted in solder flux
TiO2It is the principal component of slag forming agent, has and be formed uniformly the good slag of covering property, and make arc stability The effect of raising.In addition, TiO2Addition also have improve slag fusing point and keep the weld bead shape in all-position welding flat Effect.TiO2When content is lower than 4.0 mass %, it cannot get above-mentioned effect.On the other hand, if TiO2Content is higher than 12.0 matter The reason of amount %, then solder flux is very difficult to melt, and solder flux column is unmelted, becomes the generation of slag inclusion.Therefore, the TiO in solder flux2Contain Amount is 4.0~12.0 mass % in welding wire gross mass.TiO2Content is preferably 5.0 mass % or more.Additionally, it is preferred that being 10.0 mass % or less.
< SiO2: 0.05~3.0 mass % > is accounted in solder flux
SiO2It is coating uniformly to make slag for the viscosity for improving slag, so that having makes the good effect of slag fissility.SiO2 When content is lower than 0.05 mass %, it cannot get said effect.On the other hand, if SiO2Content is higher than 3.0 mass %, then slag Setting temperature reduces, and comprehensive lower welding metal is easy sagging.Therefore, the SiO in solder flux2Content is in welding wire gross mass 0.05~3.0 mass %.SiO2Content is preferably 0.2 mass % or more.Additionally, it is preferred that being 2.0 mass % or less.
< ZrO2: 0.5~5.0 mass % > is accounted in solder flux
ZrO2With slag solidification is accelerated, the effect of the flat weld bead shape under vertical position of welding and overhead position can be obtained Fruit.ZrO2When content is lower than 0.5 mass %, it is unable to fully obtain above-mentioned effect.On the other hand, if ZrO2Content is higher than 5.0 matter % is measured, then incurs the deterioration of slag covering property, slag fissility significantly deteriorates.Therefore, the ZrO in solder flux2Content, it is total in welding wire It is 0.5~5.0 mass % in quality.ZrO2Content is preferably 1.0 mass % or more.Additionally, it is preferred that being 4.0 mass % or less.
< Al2O3: 2.0 mass % or less > is accounted in solder flux
Al2O3Incur the deterioration of slag fissility.Therefore, the Al in solder flux2O3Content is 2.0 matter in welding wire gross mass Measure % or less.Al2O3Content is preferably 1.5 mass % or less.In addition, lower limit value does not have special provision, but be preferably free of Al2O3 Method.
< about the alkali metal compound being made of Na, K and Li, alkali metal scaled value it is total: account for 0.1 in solder flux~ 2.0 mass % >
Na, K, Li et al. alkali metal have the effect of making arc stability to improve.It can be used as fluoride and composite oxygen Compound addition, the alkali metal compound being made of Na, K and Li are added up in terms of alkali metal scaled value and are contained 0.1~2.0 matter Measure %.The total of Na, K and Li is lower than 0.1 mass %, arc stability deterioration.On the other hand, it if being higher than 2.0 mass %, melts Slag melting point reduces, the weld bead shape deterioration in all-position welding.Therefore, the total of Na, K and Li in solder flux is converted with alkali metal Value meter is 0.1~2.0 mass % in welding wire gross mass.Total preferably 1.5 mass % or less of Na, K and Li.
Fluorine scaled value of the < for fluoride: 0.1~1.0 mass % > is accounted in solder flux
Fluorine has the effect of reducing the gas hole defect as caused by moisture.0.1 matter is lower than for the fluorine scaled value of fluoride When measuring %, it cannot get the reduction effect of gas hole defect.On the other hand, if the fluorine scaled value for fluoride is higher than 1.0 mass %, Then arc stability deteriorates.Therefore, the fluorine scaled value of the fluoride in solder flux is 0.1~1.0 matter in welding wire gross mass Measure %.The fluorine scaled value of fluoride is preferably 0.2% mass % or more.Additionally, it is preferred that being 0.8 mass % or less.
Bi scaled value of the < for Bi compound: 0.01 mass % or less >
Bi is segregated in the final resolidified region of welding metal, makes the anti-thread breakage deterioration of the heat resistanceheat resistant of welding metal.Therefore, Bi chemical combination The content of object is calculated as 0.01 mass % or less in welding wire gross mass with Bi scaled value.The content of Bi compound, is converted with Bi Value meter is preferably 0.001 mass % or less.In addition, lower limit value does not have special provision, but the method for being preferably free of Bi compound.
The surplus > of < solder flux
In addition, the surplus of solder flux is Fe, incidentally added by strip, Fe alloy, is 30~65 matter in welding wire gross mass Measure %.In addition, also including inevitable impurity.The content of inevitable impurity in solder flux, it is excellent in welding wire gross mass 1.0 mass % are selected as hereinafter, more preferably 0.5 mass % or less.
The surplus of < flux-cored wire: inevitable impurity >
The surplus of ingredient as flux-cored wire entirety, is inevitable impurity.As inevitable impurity, example Such as, P, S, Co, V etc. can be enumerated.The content of inevitable impurity in welding wire is preferably 1.0 matter in welding wire gross mass % is measured hereinafter, more preferably 0.5 mass % or less.Especially for improving, heat resistanceheat resistant is anti-thread breakage, and preferably P and S add up to 0.040 matter Measure % or less.
In addition, flux-cored wire, other than above-mentioned inevitable impurity, there are also contain Ca chemical combination as slag forming agent The case where object, Ba compound, and about these compounds, in welding wire gross mass, preferably respectively with Ca scaled value, Ba scaled value Be calculated as it is following shown in specified amount.
Ca scaled value of the < for Ca compound: 1.0 mass % or less >
Ca makes the reduction of slag fusing point, deteriorates comprehensive welding operability.By reducing Ca, slag fissility is more preferable, It can obtain comprehensive flat weld bead shape.Therefore, the content of Ca compound, in welding wire gross mass, in terms of Ca scaled value For 1.0 mass % or less.The content of Ca compound is in terms of Ca scaled value, preferably 0.5 mass % or less.In addition, lower limit value does not have The method for having special provision, but being preferably free of Ca compound.
Ba scaled value of the < for Ba compound: 1.0 mass % or less >
Ba makes the reduction of slag fusing point, deteriorates comprehensive welding operability.By reducing Ba, slag fissility is more preferable, It can obtain comprehensive flat weld bead shape.Therefore, the content of Ba compound, in welding wire gross mass, in terms of Ba scaled value For 1.0 mass % or less.The content of Ba compound is preferably 0.5 mass % or less in terms of Ba scaled value.In addition, lower limit value does not have The method for having special provision, but being preferably free of Ba compound.
The manufacturing method of flux-cored wire of the invention is not particularly limited, with the manufacture of general manufacturing process.For example, logical It crosses following process manufacture: the strip of stainless steel is shaped to U-shaped, in U-shaped molding strip after filling flux, be shaped to interior Portion is filled with the tubular type of solder flux, wire drawing to aimed dia.
The material of crust, steel grade of stainless steel etc. can use with being not particularly limited, the member in flux-cored wire total weight Element composition is within the above range.
Flux-cored wire of the invention is welded in the cryogenic steel for 5%Ni steel and various austenite stainless steels When, protective gas used is not particularly limited.For example, being able to use Ar gas, carbon dioxide (carbon dioxide, CO2), oxygen (O2) and its mixed gas etc..Wherein as impurity can not be kept away, oxygen-containing, nitrogen, hydrogen etc. also can wrap.
Wherein, can be suitable for having used Ar+CO2The gas shielded arc welding etc. of mixed gas.
In addition, the source of welding current and welding torch used, feeding device etc. when welding, can use respectively in the same way with It is past identical.
< welds object >
Flux-cored wire of the invention preferably uses in the welding of the stainless steel of low temperature applications and 5%Ni steel etc..Use this The preferred characteristic for the welding object that welding wire is welded is for example following.
(tensile strength)
Welding tensile strength obtained in the test of the foundation AWS B4.0 of object is preferably 570N/mm2More than, more preferably 600N/mm2More than.
(low-temperature flexibility)
The toughness for welding object, in -196 DEG C of the pendulum impact test according to AWS B4.0, absorbing can preferably 27J More than, more preferably 34J or more.
(anti-defective)
In the evaluation that the RT of the foundation AWS A5.22 of welding object is tested, criterion of acceptability, more preferable diameter are preferably satisfied The defect number of 0.8mm or more is 0, and diameter 0.4mm or more, the defect number lower than 0.8mm are 10 or less.
(heat resistanceheat resistant is anti-thread breakage)
It can implement chalk test for the welding bead surface after just having welded, whether there are cracks by inquiry is commented Valence.Specifically, in FISCO cracking test, preferred weld electric current 180A and crackle does not occur for when speed of welding 40cpm, more Preferred weld electric current 200A and crackle does not occur for when speed of welding 40cpm.
(arc stability)
Arc stability when welding, preferably transitional form splash close in the droplet transfer of spray transfer it is fewer, More preferable molten drop granule and few spray transfer that splashes.
(slag fissility)
Slag fissility after welding, preferably slag are gently tapping the just i.e. removing of degree power below with hammer, more excellent Selected from right removing.
(upward welding in the vertical position)
When upward welding in the vertical position position is welded, preferably judgement of the weld bead shape satisfaction according to the fillet weld of AWS A5.22 Standard, also, more preferably flat weld bead shape.
[embodiment]
Hereinafter, enumerating embodiment further illustrates the present invention, but the present invention is not limited by these embodiments, can be in energy Enough meet and changed implementation in the range of spirit of the invention, these are all contained in technical scope of the invention.
1~10 > of < embodiment 1~14 and comparative example
Using the crust of chemical composition described in table 1, the flux-cored wire of chemical composition shown in table 2 is made.
The string diameter of obtained flux-cored wire is 1.2mm, and solder flux rate is 21~34 mass %.
In addition, the chemical composition of Tables 1 and 2, is indicated with the quality % relative to welding wire gross mass.In addition, so-called " Bi " Indicate the Bi scaled value for Bi compound, so-called " F " indicates the fluorine scaled value for fluoride, it is so-called " Na+K+Li ", it indicates Adding up to alkali metal scaled value for the alkali metal compound being made of Na, K and Li.In addition so-called " formula A " is welding wire institute Among the content for each ingredient for including, the value indicated by [Ni+30 × (C+N)+0.5 × Mn+12.4], so-called " formula B " is welding wire Among the content for each ingredient for being included, by the value of [Cr+Mo+1.5 × Si+0.5 × Nb] expression.
[table 1]
[table 2]
Evaluating characteristics are carried out for obtained flux-cored wire and using the welding object that the welding wire is welded.
Specifically, as welding metal performance, with regard to tensile strength, low-temperature flexibility, anti-defective and heat resistanceheat resistant it is anti-thread breakage into Row evaluation.In addition, as welding operability, with regard to arc stability, slag fissility and upward welding in the vertical position position weld bead shape into Row evaluation.
In addition, welding operability is evaluated by the fillet welding of upward welding in the vertical position.Specifically, protective gas uses 80%Ar- 20%CO2, welded with welding current (150~180A), arc voltage (24~27V), evaluation welding operability.Each evaluation Specific method it is as follows, evaluation result is shown in table 3.
(tensile strength)
The evaluation of tensile strength is carried out by the test of the foundation AWS B4.0 of welding object.If tensile strength is 600N/ mm2More than, then it is evaluated as ◎ (extremely good), 570N/mm2Above, it is lower than 600N/mm2For zero (good), it is lower than 570N/mm2 For × (bad).
(low-temperature flexibility)
The evaluation of low-temperature flexibility is carried out by -196 DEG C of the pendulum impact test according to AWS B4.0.If absorbing energy It for 34J or more, is then evaluated as ◎ (extremely good), 27J or more, is lower than 34J for zero (good), is × (bad) lower than 27J.
(anti-defective)
The evaluation of anti-defective is carried out by the RT test according to AWS A5.22.If meeting criterion of acceptability, and diameter The defect number of 0.8mm or more is 0, and diameter 0.4mm or more, the defect number lower than 0.8mm are 10 hereinafter, being then evaluated as ◎ (extremely good), meeting criterion of acceptability is zero (good), and being unsatisfactory for criterion of acceptability is × (bad).
(heat resistanceheat resistant is anti-thread breakage)
Chalk test is implemented for the welding bead surface after just welding, whether there are cracks for investigation.Specifically, exist In FISCO cracking test, it is (extremely good to be then evaluated as ◎ by welding current 200A and there is no crackles when speed of welding 40cpm It is good), if there is no crackle, zero (good), welding current 180A and welderings when welding current 180A and speed of welding 40cpm It is × (bad) that crackle occurs when meeting speed 40cpm.
(arc stability)
Arc stability when welding, if it is molten drop granule and the few spray transfer of splashing then to be evaluated as ◎ (extremely good It is good), transitional form splashes fewer for zero (good) close in the droplet transfer of spray transfer, and for globular transfer, molten drop is big, It is × (bad) that generation, which is largely splashed,.
(slag fissility)
Slag fissility after welding, it is ◎ (extremely good) that slag is removed naturally, is gently just removed with hammer percussion It is zero (good), it is × (bad) that slag seizure can not be removed on welding bead surface.
(upward welding in the vertical position)
When upward welding in the vertical position position is welded, meet the criterion of the fillet weld according to AWS A5.22, and become flat Flat weld bead shape is ◎ (extremely good), and meeting the criterion is zero (good), is unsatisfactory for the criterion, becomes Projection welding road is × (bad).
[table 3]

Claims (2)

1. a kind of stainless flux-cored wire, which is characterized in that be the stainless steel medicine core for being filled with solder flux in the crust of stainless steel Welding wire,
In welding wire gross mass, contain
C:0.04 mass % or less,
Si:0.8 mass % or less,
The mass of Mn:0.5~5.0 %,
Cu:3.0 mass % or less,
The mass of Ni:13~33 %,
The mass of Cr:15~29 %,
The mass of Mo:2.0~6.0 %,
Nb:1.0 mass % or less and
The mass % of N:0.08~0.25,
In the solder flux, in terms of welding wire gross mass, also contain
TiO2: 4.0~12.0 mass %,
SiO2: 0.05~3.0 mass %,
ZrO2: 0.5~5.0 mass %,
Al2O3: 2.0 mass % or less,
For the Bi scaled value of Bi compound: 0.01 mass % hereinafter,
For the alkali metal compound being made of Na, K and Li alkali metal scaled value it is total: 0.1~2.0 mass %, and
For the fluorine scaled value of fluoride: 0.1~1.0 mass %.
2. stainless flux-cored wire according to claim 1, which is characterized in that the content of each ingredient included in welding wire Meet following relational expressions,
A/B≥1.4
A=Ni+30 × (C+N)+0.5 × Mn+12.4
B=Cr+Mo+1.5 × Si+0.5 × Nb.
CN201610955632.2A 2016-01-25 2016-10-27 Stainless flux-cored wire Expired - Fee Related CN106994570B (en)

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