WO2022130905A1 - フラックス入りワイヤ - Google Patents

フラックス入りワイヤ Download PDF

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Publication number
WO2022130905A1
WO2022130905A1 PCT/JP2021/042699 JP2021042699W WO2022130905A1 WO 2022130905 A1 WO2022130905 A1 WO 2022130905A1 JP 2021042699 W JP2021042699 W JP 2021042699W WO 2022130905 A1 WO2022130905 A1 WO 2022130905A1
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WIPO (PCT)
Prior art keywords
mass
wire
less
content
respect
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PCT/JP2021/042699
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English (en)
French (fr)
Japanese (ja)
Inventor
啓史 馬庭
良彦 北川
正道 鈴木
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Kobe Steel Ltd
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Kobe Steel Ltd
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Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to US18/251,661 priority Critical patent/US12611738B2/en
Priority to EP21906268.4A priority patent/EP4265370A4/en
Priority to KR1020237019256A priority patent/KR20230098876A/ko
Priority to CN202180081118.XA priority patent/CN116568453B/zh
Publication of WO2022130905A1 publication Critical patent/WO2022130905A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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°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°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
    • B23K35/02—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 or wires
    • B23K35/0266—Rods, electrodes or 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
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings or 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 or 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
    • B23K35/22—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 or 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 or 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 or 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

Definitions

  • the present invention relates to a flux-cored wire.
  • gas is liquefied at a low temperature and stored in a tank in order to improve the efficiency of transportation and storage. Therefore, the structural members of the storage tank are required to have low temperature toughness in the liquefaction temperature range of the gas to be stored.
  • a structural member such as a storage tank for liquefied ethylene gas, a 5% Ni steel sheet having good tensile strength and low temperature toughness is used.
  • a Ni-based alloy welding material is often used as the welding material for the 5% Ni steel sheet, but a stainless steel welding material, which is cheaper than the Ni-based alloy, is also used.
  • Patent Document 1 discloses a wire containing stainless steel flux for a 5% Ni steel sheet.
  • the flux-cored wire is improved in low temperature toughness by adjusting the components of the weld metal so as to have a complete austenite structure.
  • the storage tank for liquefied natural gas is required to have toughness characteristics in a lower temperature range than the tank for liquefied ethylene gas, so it has better low temperature toughness and higher strength than 5% Ni steel sheet. % Ni steel sheet is used.
  • a Ni-based alloy welding material is generally used as the welding material, but if the stainless steel welding material can be applied, the cost can be reduced.
  • the stainless steel flux-cored wire described in Patent Document 1 cannot be used because the strength may be insufficient for a 9% Ni steel sheet.
  • good welding workability is also required at the time of arc welding.
  • the present invention has been made in view of the above-mentioned situation, and is a flux-welded wire capable of obtaining a weld metal having good welding workability at the time of gas shielded arc welding and excellent tensile strength and low temperature toughness.
  • the purpose is to provide.
  • the present inventors control the ratio of the austenite phase and the ferrite phase in the weld metal by defining the components in the flux-containing wire within a predetermined range, and solidify them. It has been found that the tensile strength and low temperature toughness can be improved by setting the morphology to F mode, which is a ferrite single-phase solidification, and precipitating fine Widmanstentten austenite.
  • the present invention has been made based on these findings.
  • a flux-cored wire for gas shielded arc welding in which the outer skin is filled with flux for the total mass of the wire Fe: 40% by mass or more and 70% by mass or less, Cr: 15.0% by mass or more and 25.0% by mass or less, Ni: 5.0% by mass or more and 11.0% by mass or less, Si: 0.5% by mass or more and 3.0% by mass or less, Mn: 0.5% by mass or more and 5.0% by mass or less, Total amount of Na and K: 0.05% by mass or more and 1.0% by mass or less, TiO 2 : 3.0% by mass or more and 9.0% by mass or less, ZrO 2 : More than 1.0% by mass and less than 4.0% by mass, Al 2 O 3 : Containing 0.3% by mass or more and 2.0% by mass or less, C: Less than 0.015% by mass, Ti: 1.0% by mass or less, Mo: 2.0% by mass or less, Cu: 0.5% by mass or less, Al: 0.9% by mass or less, N: 0.040% by mass or less
  • the Si content with respect to the total mass of the wire is [Si] by mass%
  • the Cr content with respect to the total mass of the wire is [Cr] with mass%
  • the Mo content with respect to the total mass of the wire is [Mo] with mass%
  • the total mass of the wire is [Si] by mass%
  • the Ti content with respect to the total mass of the wire is [Ti]
  • the C content with respect to the total mass of the wire is [C] with respect to the total mass of the wire
  • the N content with respect to the total mass of the wire is [N] with respect to the total mass of the wire
  • the Mn content with respect to the total mass of the wire is When the mass% is [Mn]
  • the Cu content with respect to the total mass of the wire is [Cu] by mass%
  • the Ni content with respect to the total mass of the wire is [Ni] by mass%.
  • one embodiment relating to the flux-cored wire is as follows.
  • Bi For the total mass of the wire Bi: It is characterized by containing 0.001% by mass or more and 0.10% by mass or less.
  • a flux-containing wire capable of obtaining a weld metal having good welding workability at the time of gas shielded arc welding and excellent tensile strength and low temperature toughness.
  • FIG. 1 is a graph showing the relationship between the tensile strength of the invention example and the comparative example and ⁇ .
  • the flux-cored wire (hereinafter, also simply referred to as “wire”) according to the present embodiment has a steel outer skin filled with flux.
  • the outer diameter of the wire is not particularly limited, but is preferably 0.9 mm or more and 1.6 mm or less, for example.
  • the flux filling rate can be set to any value as long as the content of each element in the wire is within the range of the present invention, but from the viewpoint of wire drawability and wire feedability at the time of wire production. For example, it is preferably 10% by mass or more and 20% by mass or less with respect to the total mass of the wire.
  • the wire has no limitation on the shape of the seam and the shape of the cross section, such as when the outer skin has a seam or when the wire has no seam.
  • the wire according to this embodiment can be used for gas shielded arc welding, for example, using 100% by volume CO 2 gas as a shield gas.
  • Fe 40% by mass or more and 70% by mass or less> Fe is the main component of the wire according to this embodiment.
  • the Fe content with respect to the total mass of the wire is 40% by mass or more, preferably 45% by mass or more, and more preferably 50% by mass or more.
  • the Fe content with respect to the total mass of the wire is 70% by mass or less, preferably 67.5% by mass or less, and more preferably 65% by mass or less.
  • Cr 15.0% by mass or more and 25.0% by mass or less> Cr is an important component that determines the amount of ferrite in the weld metal, and is also an important element in the oxidation resistance of the weld metal, the stability of ferrite, and the suppression of embrittlement behavior due to thermal cycles. If the Cr content with respect to the total mass of the wire is less than 15.0% by mass, it becomes insufficient to obtain a weld metal having a high ferrite structure. Therefore, the Cr content with respect to the total mass of the wire is 15.0% by mass or more, preferably 15.5% by mass or more, and more preferably 16.0% by mass or more.
  • the Cr content with respect to the total mass of the wire exceeds 25.0 mass%, the embrittlement tendency due to the multiple thermal cycles during welding becomes remarkable. Therefore, the Cr content with respect to the total mass of the wire is 25.0% by mass or less, preferably 24.5% by mass or less, and more preferably 24.0% by mass or less.
  • Ni is an important component that determines the amount of ferrite in the weld metal, and is also an important element in the oxidation resistance of the weld metal, the stability of austenite, and the suppression of embrittlement behavior due to the thermal cycle. .. If the Ni content with respect to the total mass of the wire is less than 5.0% by mass, it is insufficient to obtain a weld metal having a high austenite structure. Therefore, the Ni content with respect to the total mass of the wire is preferably 5.0% by mass or more, preferably 5.5% by mass or more, and more preferably 6.0% by mass or more.
  • the Ni content with respect to the total mass of the wire exceeds 11.0% by mass, it becomes difficult to secure the ferrite amount considered to be necessary in the present invention. Therefore, the Ni content with respect to the total mass of the wire is 11.0% by mass or less, preferably 10.8% by mass or less, and more preferably 10.6% by mass or less.
  • Si 0.5% by mass or more and 3.0% by mass or less>
  • Si is an important element as a deoxidizing agent for weld metals and is a component having an effect of improving the familiarity of weld beads. If the Si content with respect to the total mass of the wire is less than 0.5% by mass, it causes insufficient deoxidation, causes pore defects such as blow holes, and causes a decrease in toughness of the weld metal. Therefore, the Si content with respect to the total mass of the wire is 0.5% by mass or more, preferably 0.6% by mass or more, and more preferably 0.8% by mass or more.
  • the Si is a ferrite stabilizing element, but if it is added in an excessive amount in the wire, the toughness decreases even if the amount of ferrite is the same. Therefore, the Si content with respect to the total mass of the wire is 3.0% by mass or less, preferably 2.5% by mass or less, and more preferably 2.0% by mass or less. In the present embodiment, the Si content represents the content of all Si derived from Si simple substance, Si compound and Si alloy contained in the wire.
  • Mn is an important element as a deoxidizing agent for weld metals. If the Mn content with respect to the total mass of the wire is less than 0.5% by mass, it may cause insufficient deoxidation, cause pore defects such as blow holes, or reduce the toughness of the weld metal. .. Therefore, the Mn content with respect to the total mass of the wire is 0.5% by mass or more, preferably 1.0% by mass or more, and more preferably 1.5% by mass or more. On the other hand, if the Mn content with respect to the total mass of the wire exceeds 5.0% by mass, the slag peelability may decrease. Therefore, the Mn content with respect to the total mass of the wire is 5.0% by mass or less, preferably 4.0% by mass or less, and more preferably 3.0% by mass or less.
  • ⁇ Total amount of Na and K 0.05% by mass or more and 1.0% by mass or less>
  • Na and K are components having an effect of stabilizing the arc, and a good bead shape can be obtained by adding them in an appropriate amount in the wire. If the total amount of Na and K with respect to the total mass of the wire is less than 0.05% by mass, a good bead shape cannot be obtained. Therefore, the total amount of Na and K with respect to the total mass of the wire is 0.05% by mass or more, preferably 0.10% by mass or more, and more preferably 0.50% by mass or more. On the other hand, when the total amount of Na and K with respect to the total mass of the wire exceeds 1.0% by mass, the low temperature toughness decreases.
  • the total amount of Na and K with respect to the total mass of the wire is 1.0% by mass or less, preferably 0.9% by mass or less, and more preferably 0.8% by mass or less. It should be noted that both Na and K may be contained in the wire, or only one of them may be contained in the wire, and the total amount thereof is 0.05% by mass or more and 1.0% by mass or less. good.
  • TiO 2 is a component that is added to the wire as a slag forming agent and has an effect of forming a slag having good encapsulation. If the TiO 2 content with respect to the total mass of the wire is less than 3.0% by mass, the slag encapsulation property deteriorates. Therefore, the TiO 2 content with respect to the total mass of the wire is preferably 3.0% by mass or more, preferably 5.0% by mass or more, and more preferably 7.0% by mass or more.
  • the TiO 2 content with respect to the total mass of the wire exceeds 9.0 mass%, the amount of slag generated becomes excessive, and slag entrainment is likely to occur in the welded portion. Therefore, the TiO 2 content with respect to the total mass of the wire is 9.0% by mass or less, preferably 8.5% by mass or less, and more preferably 8.0% by mass or less. In this embodiment, the TiO 2 content is a TiO 2 conversion value of the Ti compound.
  • ZrO 2 is a high melting point oxide, which is a component for adjusting the viscosity and melting point of slag, and has an effect of raising the solidification temperature of slag and improving the bead shape at the time of welding. If the ZrO 2 content with respect to the total mass of the wire is 1.0% by mass or less, the bead shape becomes poor. Therefore, the ZrO 2 content with respect to the total mass of the wire is preferably more than 1.0% by mass, preferably 1.3% by mass or more, and more preferably 1.6% by mass or more.
  • the ZrO 2 content with respect to the total mass of the wire exceeds 4.0% by mass, the melting point of the molten slag may become excessive and the bead appearance and bead shape may deteriorate. Therefore, the ZrO 2 content with respect to the total mass of the wire is 4.0% by mass or less, preferably 3.0% by mass or less, and more preferably 2.0% by mass or less.
  • the ZrO 2 content is defined as a ZrO 2 conversion value of all Zr contained in Zr simple substance, Zr alloy and Zr compound.
  • Al 2 O 3 is a component having an effect of increasing the viscosity of the molten slag, improving the fluidity, and improving the bead appearance and the bead shape. If the Al 2 O 3 content with respect to the total mass of the wire is less than 0.3% by mass, the bead appearance and the bead shape cannot be kept good, and in particular, the workability of vertical welding is deteriorated. Therefore, the Al 2 O 3 content with respect to the total mass of the wire is 0.3% by mass or more, preferably 0.6% by mass or more, and more preferably 0.9% by mass or more.
  • the Al 2 O 3 content with respect to the total mass of the wire exceeds 2.0% by mass, the viscosity of the molten slag becomes too high and the bead shape becomes poor. Therefore, the Al 2 O 3 content with respect to the total mass of the wire is 2.0% by mass or less, preferably 1.5% by mass or less, and more preferably 1.0% by mass or less. In this embodiment, the Al 2 O 3 content is an Al 2 O 3 conversion value of the Al compound.
  • the C content with respect to the total mass of the wire is preferably less than 0.015% by mass, preferably 0.012% by mass or less, and more preferably 0.009% by mass or less.
  • Ti is not an essential component in the wire of the present embodiment, but since it is an element having a deoxidizing action, Ti can be contained in the wire as an optional component.
  • the Ti content with respect to the total mass of the wire exceeds 1.0% by mass, carbon in the weld metal increases due to the effect as a strong deoxidizing agent, and the toughness of the weld metal decreases. Therefore, the Ti content with respect to the total mass of the wire is 1.0% by mass or less, preferably 0.8% by mass or less, and more preferably 0.6% by mass or less.
  • the lower limit of the Ti content with respect to the total mass of the wire is not particularly limited and may be 0% by mass, but may be 0.001% by mass or more. Further, in the present embodiment, the Ti content is the total amount of Ti contained in the Ti simple substance and the Ti alloy.
  • Mo is not an essential component in the wire of the present embodiment, but Mo can be contained in the wire as an optional component for the purpose of improving the strength of the weld metal.
  • Mo content with respect to the total mass of the wire exceeds 2.0% by mass, the low temperature toughness decreases. Therefore, the Mo content with respect to the total mass of the wire is 2.0% by mass or less, preferably 1.8% by mass or less, and more preferably 1.6% by mass or less.
  • the lower limit of the Mo content with respect to the total mass of the wire is not particularly limited and may be 0% by mass, but may be 0.001% by mass or more.
  • Cu is not an essential component in the wire of the present embodiment, but Cu can be contained in the wire as an optional component for the purpose of stabilizing the austenite structure.
  • the Cu content with respect to the total mass of the wire exceeds 0.5% by mass, the low temperature toughness decreases. Therefore, the Cu content with respect to the total mass of the wire is 0.5% by mass or less, preferably 0.3% by mass or less, and more preferably 0.1% by mass or less.
  • the lower limit of the Cu content with respect to the total mass of the wire is not particularly limited and may be 0% by mass, but may be 0.001% by mass or more.
  • Al is not an essential component in the wire of the present embodiment, but since it is an element having a deoxidizing action, Al can be contained in the wire as an optional component.
  • the Al content with respect to the total mass of the wire exceeds 0.9% by mass, the solidified structure of ferrite changes from columnar crystals to equiaxed crystals, and the shape of austenite produced thereafter changes from Widmansttenten-like to granular. , The toughness is lowered and the slag removability is deteriorated. Therefore, the Al content with respect to the total mass of the wire is 0.9% by mass or less, preferably 0.6% by mass or less, and more preferably 0.2% by mass or less.
  • the lower limit of the Al content with respect to the total mass of the wire is not particularly limited and may be 0% by mass, but may be 0.001% by mass or more.
  • the Al content is the total amount of Al contained in the simple substance of Al and the Al alloy.
  • N 0.040% by mass or less>
  • N is not an essential component in the wire of the present embodiment, it is an element having an effect of improving the strength of the weld metal, lowering the surface tension and improving the familiarity of the bead, and therefore N is contained in the wire as an optional component. Can be made to.
  • the N content with respect to the total mass of the wire exceeds 0.040% by mass, the surface tension of the molten metal becomes too low, spatter increases, the bead shape deteriorates, and the slag peelability also deteriorates. Therefore, the N content with respect to the total mass of the wire is 0.040% by mass or less, preferably 0.030% by mass or less, and more preferably 0.020% by mass or less.
  • the lower limit of the N content with respect to the total mass of the wire is not particularly limited and may be 0% by mass, but may be 0.001% by mass or more.
  • F is not an essential component in the wire of the present embodiment, it is an element having an effect of increasing the viscosity of the molten slag, improving the fluidity, and improving the bead appearance and the bead shape.
  • the lower limit of the F content with respect to the total mass of the wire is not particularly limited and may be 0% by mass, but may be 0.001% by mass or more.
  • the content of each of the above elements is appropriately controlled, and ⁇ calculated by the following formula (I) is controlled based on the amount of each alloy element contained in the wire to control the weld metal. Can be maintained at a predetermined amount of ferrite to obtain desired strength and toughness. If ⁇ calculated by the formula (I) is less than 10.0, the amount of ferrite is insufficient and the strength of the weld metal is insufficient. Therefore, ⁇ is preferably 10.0 or more, preferably 12.0 or more, and more preferably 24.0 or more.
  • ⁇ is preferably 30.0 or less, and preferably 29.0 or less.
  • the Si content with respect to the total mass of the wire is [Si] by mass%
  • the Cr content with respect to the total mass of the wire is [Cr] with mass%
  • the Mo content with respect to the total mass of the wire is [Mo] with mass%
  • the total mass of the wire is [Si] by mass%
  • the Ti content with respect to the total mass of the wire is [Ti]
  • the C content with respect to the total mass of the wire is [C] with respect to the total mass of the wire
  • the N content with respect to the total mass of the wire is [N] with respect to the total mass of the wire
  • the Mn content with respect to the total mass of the wire is When the mass% is [Mn]
  • the Cu content with respect to the total mass of the wire is [Cu] by mass%
  • the Ni content with respect to the total mass of the wire is [Ni] by mass%.
  • the wire according to this embodiment may further contain Bi.
  • Bi is a component having an effect of improving the slag peelability, but if it is excessively contained in the wire, Bi segregates in the final solidification region of the weld metal, and the high temperature crack resistance of the weld metal deteriorates.
  • the Bi content with respect to the total mass of the wire is preferably 0.001% by mass or more, and more preferably 0.01% by mass or more.
  • the Bi content with respect to the total mass of the wire is 0.10% by mass or less, deterioration of the high temperature crack resistance of the weld metal can be suppressed. Therefore, the Bi content with respect to the total mass of the wire is preferably 0.10% by mass or less, and more preferably 0.08% by mass or less.
  • the Bi content is the total Bi content contained in the Bi simple substance, the Bi alloy, and the Bi compound.
  • the wire according to the present embodiment contains unavoidable impurities in the range of 2.0% by mass or less as the balance of components other than the above. Further, the remaining portion of the wire may contain C Cincinnati, V, W, etc. in the range of 1.0% by mass or less, respectively.
  • the wire according to this embodiment includes Fe, Cr, Ni, Si, Mn, Na and K, TiO 2 , ZrO 2 , Al 2 O 3 , C, Ti, Mo, Cu, Al, N and F in total. It is preferably contained in an amount of 90% by mass or more, more preferably 93% by mass or more, further preferably 95% by mass or more, and particularly preferably 98% by mass or more.
  • the chemical composition of the wire was adjusted to various contents, and a flux-cored wire for gas shielded arc welding having a diameter of 1.20 mm was produced.
  • Tensile strength was evaluated, and V-notch test pieces were taken and low temperature toughness was evaluated by Charpy impact test at -196 ° C.
  • As the evaluation criteria for mechanical properties those with a tensile strength of 640 MPa or more and a Charpy impact value of 25 J or more at -196 ° C were evaluated as ⁇ (good), and among these, the tensile strength was 670 MPa or more. The ones that were given were marked as ⁇ (excellent). Further, those having a tensile strength of less than 640 MPa or a Charpy impact value of less than 25 J at -196 ° C. were defined as x (defective).
  • the bead shape was evaluated according to AWS A5.22 15.2.2.
  • As the evaluation criteria for the bead shape those satisfying the above-mentioned AWS standard judgment criteria were evaluated as ⁇ (good), and those not satisfying the above-mentioned criteria and having a convex bead shape were evaluated as x (poor).
  • ⁇ Evaluation of slag peelability> The slag peelability was evaluated by giving a slight impact to the welded joint with a hammer and confirming the slag peeling. As the evaluation criteria for slag peelability, ⁇ (good) indicates that the slag spontaneously peels off or the slag peels off due to a slight impact, and ⁇ (good) indicates that the slag does not peel off due to seizure on the surface of the bead. Defective).
  • [Si] is a value expressing the Si content with respect to the total mass of the wire in mass%
  • [Cr] is a value expressing the Cr content with respect to the total mass of the wire in mass%
  • [Mo] is a value expressing the Mo content with respect to the total mass of the wire in mass%
  • [Ti] is a value expressing the Ti content with respect to the total mass of the wire in mass%
  • [C] is a value expressing the entire wire.
  • [N] is a value expressing the N content with respect to the total mass of the wire in mass%
  • [Mn] is a value expressing the Mn content with respect to the total mass of the wire by mass.
  • % [Cu] is a value expressing the Cu content with respect to the total mass of the wire in mass%
  • [Ni] is a value expressing the Ni content with respect to the total mass of the wire in mass%.
  • the wire No. which is an example of the invention.
  • the wire component and ⁇ obtained by the formula (1) are within the range of the present invention, the mechanical properties and the welding workability are excellent.
  • the wire No. which is a comparative example.
  • the content of each component was within the range of the present invention, but the ⁇ calculated by the mathematical formula (I) exceeded the upper limit of the range of the present invention, so that the low temperature toughness was lowered.
  • Wire No. 13 which is a comparative example.
  • the content of Cr, Ni and C in the wire exceeded the upper limit of the range of the present invention, and ⁇ exceeded the upper limit of the range of the present invention, so that the low temperature toughness was significantly reduced.
  • Wire No. which is a comparative example.
  • the wire No. No. 16 since the Al 2 O 3 content in the wire is less than the lower limit of the range of the present invention, the bead shape and the slag peeling property in the vertical fillet welding are poor, and the slag peeling property in the horizontal fillet welding is poor. Was also bad.
  • the wire No. No. 16 also had reduced low temperature toughness.
  • Wire No. which is a comparative example.
  • the Al content in the wire exceeds the upper limit of the range of the present invention, the bead shape and slag peelability in vertical fillet welding are poor, and the slag peelability in horizontal fillet welding is also poor. It became.
  • These wires also had reduced low temperature toughness.
  • Wire No. which is a comparative example.
  • the Mo content in the wire exceeded the upper limit of the range of the present invention, so that the low temperature toughness was lowered.
  • FIG. 1 is a graph showing the relationship between the tensile strength and ⁇ of the wires of the invention example and the comparative example when the vertical axis is the tensile strength (MPa) and the horizontal axis is ⁇ .
  • the broken line shown in FIG. 1 is an approximate straight line in which each point is linearly approximated. As shown in FIG. 1, it was shown that the tensile strength decreased as the value of ⁇ calculated by the mathematical formula (I) became smaller.
  • a weld metal having a good bead shape and slag peelability and an excellent balance between tensile strength and low temperature toughness can be obtained. I was able to.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)
PCT/JP2021/042699 2020-12-18 2021-11-19 フラックス入りワイヤ Ceased WO2022130905A1 (ja)

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US18/251,661 US12611738B2 (en) 2020-12-18 2021-11-19 Flux-cored wire
EP21906268.4A EP4265370A4 (en) 2020-12-18 2021-11-19 CORED WIRE
KR1020237019256A KR20230098876A (ko) 2020-12-18 2021-11-19 플럭스 코어드 와이어
CN202180081118.XA CN116568453B (zh) 2020-12-18 2021-11-19 药芯焊丝

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KR20230098876A (ko) 2023-07-04
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US12611738B2 (en) 2026-04-28
US20240009779A1 (en) 2024-01-11
CN116568453B (zh) 2025-11-18
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EP4265370A1 (en) 2023-10-25
JP7831951B2 (ja) 2026-03-17

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