Classifications

• • 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
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  • 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
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  • 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
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  • 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
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  • 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
  • B23K35/3066—Fe as the principal constituent with Ni as next major constituent
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  • 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
  • B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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  • 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
  • B23K35/22—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
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • 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
  • B23K9/0061—Underwater arc welding
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • 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
  • B23K9/18—Submerged-arc welding
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  • 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
  • B23K9/18—Submerged-arc welding
  • B23K9/186—Submerged-arc welding making use of a consumable electrodes
• • C—CHEMISTRY; METALLURGY
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  • C22C—ALLOYS
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  • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
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  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
• • C—CHEMISTRY; METALLURGY
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  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
• • C—CHEMISTRY; METALLURGY
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  • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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  • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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  • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
• • C—CHEMISTRY; METALLURGY
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  • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
• • C—CHEMISTRY; METALLURGY
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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  • 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
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  • C22C—ALLOYS
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
• • C—CHEMISTRY; METALLURGY
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  • 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
  • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
• • C—CHEMISTRY; METALLURGY
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  • 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
  • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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  • 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
  • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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  • 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
  • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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  • 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

Definitions

• This disclosure relates to a method for manufacturing solid wire and welded joints.
• Ni-based low-temperature steel containing 6 to 9% Ni is used for the steel materials used in liquid hydrogen tanks, liquid carbon dioxide tanks, LNG tanks, etc., because of the need to ensure toughness at the extremely low temperature of -196°C.
• Austenitic wires that can produce weld metals with excellent low-temperature toughness are used for welding these Ni-based low-temperature steels. These wires are mainly designed with a Ni content of 70%.
• Patent Document 1 describes a wire having a Ni content of 35 to 70%, in which the flux contains TiO 2 , SiO 2 and ZrO 2 in a total amount of 4.0 mass% or more with respect to the total mass of the wire, and further contains Mn oxides in an amount of 0.6 to 1.2 mass% calculated as MnO 2 , and when the contents of TiO 2 , SiO 2 , ZrO 2 and MnO 2 (converted amounts) are expressed in mass% as [TiO 2 ], [SiO 2 ], [ZrO 2 ] and [MnO 2 ], respectively, [TiO 2 ]/[ZrO 2 ] is 2.3 to 3.3, [SiO 2 ]/[ZrO 2 ] is 0.9 to 1.5, and ([TiO 2 ]+[SiO 2 ]+[ZrO 2 ])/[MnO 2 ] is 0.9 to 1.5. ] is 5 to 13
• the objective of the present invention is to provide a solid wire for submerged arc welding that is inexpensive and produces weld metal with excellent low-temperature toughness, and a method for manufacturing a welded joint using the solid wire.
• a solid wire for submerged arc welding the chemical composition of the solid wire being, in mass% with respect to a total mass of the solid wire, C: 0 to 0.650%, Si: 0.03 to 0.50%, Mn: 4.1 to 30.0%, P: 0 to 0.050%, S: 0 to 0.050%, Cu: 0 to 5.0%, Ni: 1.0 to 30.0%, Cr: 0 to 10.0%, Mo: 0 to 10.0%, Nb: 0 to 1.00%, V: 0 to 1.00%, Co: 0 to 1.00%, Pb: 0 to 1.00%, Sn: 0 to 1.00%, Al: 0 to 0.10%, Ti: 0 to 0.10%, B: 0 to 0.1000%, N: 0 to 0.500%, O: 0 to 0.0050%, and the balance: Fe and impurities; and the sum of the Mn content and the Ni content (Mn + Ni) is 5.0% or more
• ⁇ 2> The solid wire according to ⁇ 1>, wherein a mass ratio (Ni/Mn) of the Mn content to the Ni content is 0.10 or more.
• ⁇ 3> The solid wire according to ⁇ 2>, wherein the mass ratio (Ni/Mn) is 1.00 or more.
• ⁇ 4> The solid wire according to any one of ⁇ 1> to ⁇ 3>, wherein the Ti content is Ti: 0.003 to 0.10%.
• a method for manufacturing a welded joint comprising a step of submerged arc welding steel materials using the solid wire according to any one of ⁇ 1> to ⁇ 4>.
• the present disclosure provides a solid wire for submerged arc welding that is inexpensive and produces weld metal with excellent low-temperature toughness, as well as a method for manufacturing a welded joint using the solid wire.
• the solid wire according to the present disclosure has a predetermined chemical composition. Due to the above-described configuration, the solid wire according to the present disclosure serves as a wire for submerged arc welding that is inexpensive and can provide a weld metal having excellent low-temperature toughness. The solid wire according to the present disclosure was discovered based on the following findings.
• the present inventors have investigated a technique for obtaining a wire for submerged arc welding capable of improving the low temperature toughness of the weld metal even when the Ni content is reduced and the Mn content is increased. As a result, the following findings have been obtained.
• Both Ni and Mn are austenite stabilizing elements.
• the Ni content is reduced or the Mn content is increased excessively, the stacking fault energy is reduced and the toughness is deteriorated. Therefore, the Ni and Mn contents are controlled to prevent the decrease in stacking fault energy.
• the solid wire for submerged arc welding according to the present disclosure is an inexpensive wire that can provide a weld metal having excellent low-temperature toughness.
• the solid wire for submerged arc welding according to the present disclosure melts together with a part of the steel material to be welded by submerged arc welding and the flux, and becomes a weld metal after solidification.
• the chemical composition of the solid wire according to the present disclosure is: C: 0 to 0.650%, Si: 0.03 to 0.50%, Mn: 4.1 to 30.0%, P: 0 to 0.050%, S: 0 to 0.050%, Cu: 0 to 5.0%, Ni: 1.0 to 30.0%, Cr: 0 to 10.0%, Mo: 0 to 10.0%, Nb: 0 to 1.0%, V: 0 to 1.0%, Co: 0 to 1.0%, Pb: 0 to 1.0%, Sn: 0 to 1.0%, Al: 0 to 0.10%, Ti: 0 to 0.10%, B: 0 to 0.1000%, N: 0 to 0.500%, O: 0 to 0.0050%, and the balance: Fe and impurities; and the sum of the Mn content and the Ni content (Mn + Ni) is 5.0% or more; The total of the Mn content, the Ni content, and the Cr content (Mn+Ni+Cr) is 15.0% or more, The fcc percentage
• C is an element that generates spatter.
• the lower the C content of the wire the more advantageous it is for reducing spatter.
• C is also an interstitial solid solution strengthening element. If the C content of the wire is excessive, the wire becomes hard and the core wire processing becomes difficult. Also, spatter increases. Therefore, the C content of the wire is set to 0 to 0.650%. However, reducing the C content of the wire to 0% increases the cost of decarbonization. In addition, there is a concern that the C content of the wire will be insufficient, resulting in insufficient strength of the weld metal. Therefore, the lower limit of the C content of the wire may be set to 0.003%, 0.005%, or 0.008%.
• the upper limit of the C content of the wire is preferably 0.600%, 0.500%, 0.400%, 0.300%, 0.200%, less than 0.200%, 0.190%, 0.180%, 0.150%, or 0.120%.
• Si is a deoxidizing element. If the Si content of the wire is too low, the P content of the wire increases. On the other hand, Si has a low solid solubility in the austenite phase, and the greater the Si content, the greater the amount of brittle phases such as intermetallic compounds and ⁇ ferrite that are generated at high temperatures, resulting in a deterioration in high-temperature ductility. Therefore, the Si content of the wire is set to 0.03 to 0.50%.
• the lower limit of the Si content of the wire is preferably 0.04%, 0.05%, or 0.08%.
• the upper limit of the Si content of the wire is preferably less than 0.50%, 0.48%, 0.45%, 0.40%, 0.35%, 0.30%, or 0.20%.
• Mn 4.1 to 30.0%
• Mn is an austenite stabilizing element, and if the Mn content of the wire is too low, the austenitization of the weld metal becomes difficult to proceed, and the low-temperature toughness deteriorates. Therefore, the Mn content of the wire is set to 4.1 to 30.0%.
• the lower limit of the Mn content of the wire is preferably 4.2%, 5.0%, more than 5.0%, 5.2%, more than 6.0%, 6.2%, 7.0%, more than 7.0%, 7.2%, more than 10.0%, or 10.2%.
• the upper limit of the Mn content of the wire is preferably 28.0%, 26.0%, 25.0%, 23.0%, 21.0%, 20.0%, 19.0%, 18.0%, 16.8%, 15.0%, 14.8%, or 12.0%.
• the P content of the wire is preferably 0.040% or less, 0.030% or less, 0.020% or less, 0.015% or less, or 0.010% or less.
• the S content of the wire is preferably 0.040% or less, 0.030% or less, 0.020% or less, 0.015% or less, or 0.010% or less.
• Cu is a precipitation strengthening element and may be contained in the wire to improve the strength of the weld metal.
• Cu is also an austenite stabilizing element and may be contained in the wire to improve the low temperature toughness of the weld metal.
• the Cu content of the wire is set to 0 to 5.0%.
• the lower limit of the Cu content of the wire is preferably 0.3%, 0.5%, or 0.7%.
• the upper limit of the Cu content of the wire is preferably 4.5%, 4.0%, or 3.5%.
• Ni is an austenite stabilizing element. If the Ni content of the wire is too low, the austenitization of the weld metal becomes difficult to proceed, and the low-temperature toughness deteriorates. On the other hand, increasing the Ni content of the wire increases the cost of the wire. Therefore, the Ni content of the wire is set to 1.0 to 30.0%.
• the lower limit of the Ni content of the wire is preferably 2.0%, 3.0%, 3.2%, 3.6%, 3.7%, 4.2%, 4.7%, 5.0%, 5.2%, more than 6.0%, 6.2%, 7.0%, more than 8.0%, or 8.2%.
• the upper limit of the Ni content of the wire is preferably 28.0%, 26.0%, 24.0%, 22.0%, 20.0%, 19.0%, 18.0%, 15.0%, or 12.0%.
• Cr is an austenite stabilizing element and may be contained in the wire to improve the low-temperature toughness of the weld metal.
• Cr content of the wire is set to 0 to 10.0%.
• the lower limit of the Cr content of the wire is preferably 0.01%, 0.02%, 1.0%, 2.0%, or 3.0%.
• the upper limit of the Cr content of the wire is preferably 9.0%, 8.0%, less than 8.0%, 7.8%, 7.0%, less than 6.0%, 5.8%, or 4.8%.
• Mo is a precipitation strengthening element and may be contained in the wire to improve the strength of the weld metal.
• Mo content of the wire is set to 0 to 10.0%.
• the lower limit of the Mo content of the wire is preferably 1.0%, 2.0%, or 3.0%.
• the upper limit of the Mo content of the wire is preferably 9.0%, 8.0%, or 7.0%.
• Nb is an element that forms carbides in the weld metal and increases the strength of the weld metal, and therefore may be contained in the wire.
• the Nb content of the wire is set to 0 to 1.00%.
• the lower limit of the Nb content of the wire is preferably 0.01%, 0.05%, 0.1%, 0.15%, or 0.2%.
• the upper limit for the Nb content of the wire is preferably 0.95%, 0.90%, 0.85%, or 0.80%.
• V (V: 0 to 1.00%) V is an element that forms carbonitrides in the weld metal and increases the strength of the weld metal, and therefore may be contained in the wire.
• the V content of the wire is set to 0 to 1.00%.
• the lower limit of the V content of the wire is preferably 0.01%, 0.05%, 0.1%, 0.15%, or 0.20%.
• the upper limit of the V content of the wire is preferably 0.95%, 0.90%, 0.85%, or 0.80%.
• Co (Co: 0 to 1.00%) Co is an element that increases the strength of the weld metal through solid solution strengthening, and therefore may be contained in the wire.
• the Co content of the wire is set to 0 to 1.00%.
• the lower limit of the Co content of the wire is preferably 0.01%, 0.05%, 0.1%, 0.15%, or 0.20%.
• the upper limit of the Co content of the wire is preferably 0.95%, 0.90%, 0.85%, or 0.80%.
• Pb 0 to 1.00%
• Pb has the effect of improving the toe formability between the base steel material and the weld metal and improving the machinability of the weld metal, and therefore may be contained in the wire.
• the Pb content of the wire is set to 0 to 1.00%.
• the lower limit of the Pb content of the wire is preferably 0.01%, 0.05%, 0.1%, 0.15%, or 0.20%.
• the upper limit for the Pb content of the wire is preferably 0.95%, 0.90%, 0.85%, or 0.80%.
• Sn is an element that improves the corrosion resistance of the weld metal and may be contained in the wire.
• the Sn content of the wire is set to 0 to 1.00%.
• the lower limit of the Sn content of the wire is preferably 0.01%, 0.05%, 0.1%, 0.15%, or 0.20%.
• the upper limit of the Sn content of the wire is preferably 0.95%, 0.90%, 0.85%, or 0.80%.
• Al is a deoxidizing element and may be contained in the wire in order to suppress welding defects and improve the cleanliness of the weld metal.
• Al content of the wire is set to 0 to 0.10%.
• the lower limit of the Al content of the wire is preferably 0.01%, 0.02%, or 0.03%.
• the upper limit of the Al content of the wire is preferably 0.09%, 0.08%, or 0.07%.
• Ti is a deoxidizing element and may be contained in the wire in order to suppress welding defects and improve the cleanliness of the weld metal.
• the Ti content of the wire is set to 0 to 0.10%.
• the lower limit of the Ti content of the wire is preferably 0.003%, 0.01%, 0.02%, or 0.03%.
• the upper limit of the Ti content of the wire is preferably 0.09%, 0.08%, 0.07%, or 0.05%.
• B is an austenite stabilizing element and an interstitial solid solution strengthening element, and may be contained in the wire to improve the low temperature toughness and strength of the weld metal.
• B content of the wire is set to 0 to 0.1000%.
• the lower limit of the B content of the wire is preferably 0.0005%, 0.0010%, or 0.0020%.
• the upper limit of the B content of the wire is preferably 0.0800%, 0.0500%, or 0.0100%.
• N is an austenite stabilizing element and an interstitial solid solution strengthening element, and may be contained in the wire to improve the low temperature toughness and strength of the weld metal.
• N content of the wire is set to 0 to 0.500%.
• the lower limit of the N content of the wire is preferably 0.0001%, 0.0002%, or 0.0004%.
• the upper limit of the N content of the wire is preferably 0.400%, 0.200%, 0.100%, 0.050%, or 0.020%.
• O may be contained in the wire as an impurity.
• the upper limit of the O content of the wire is set to 0.0050% or less.
• the upper limit of the O content of the wire is preferably 0.0040% or 0.0030%.
• the lower limit of the O content of the wire is preferably 0.0003% or 0.0005%.
• the remaining components in the wire's chemical composition are Fe and impurities.
• impurities refers to components that are mixed in during industrial production of wire due to raw materials such as ores or scraps, or due to various factors in the manufacturing process, and are acceptable within the range that does not adversely affect the characteristics of the wire.
• Mn and Ni are austenite stabilizing elements that improve the low-temperature toughness of the weld metal.
• Ni is an expensive metal
• the Mn content and Ni content in the wire each satisfy the above-mentioned range, and the sum of the Mn content and Ni content (Mn+Ni) is set to 5.0% or more.
• the total of the Mn content and the Ni content (Mn+Ni) in the wire is preferably 5.4% or more, 5.6% or more, 5.7% or more, 6.0% or more, 6.2% or more, 6.7% or more, 6.9% or more, 7.0% or more, 7.2% or more, 10.0% or more, or 15.0% or more.
• Mn is an element that reduces stacking fault energy and causes a decrease in toughness when added in excess, so from the viewpoint of reducing the cost of the wire and improving the low-temperature toughness of the weld metal, it is preferable that the Mn content and Ni content in the wire each satisfy the above-mentioned range, and that the total of the Mn content and Ni content (Mn+Ni) is 37.0% or less.
• the total content of Mn and Ni in the wire (Mn+Ni) is more preferably 35.0% or less, 32.0% or less, or 30.0% or less.
• Mn, Ni, and Cr are each an austenite stabilizing element and improve the low-temperature toughness of the weld metal.
• Ni is an expensive metal
• the Mn content, Ni content, and Cr content in the wire each satisfy the above-mentioned ranges, and the total of the Mn content, Ni content, and Cr content (Mn+Ni+Cr) is set to 15.0% or more.
• the total of the Mn content, Ni content and Cr content (Mn+Ni+Cr) in the wire is preferably 17.0% or more, 19.0% or more, 20.0% or more, 22.0% or more, 24.0% or more, 26.0% or more, 28.0% or more, or 30.0% or more.
• Mn is an element that reduces stacking fault energy and causes a decrease in toughness when added in excess.
• Cr is an element that forms a martensite structure and affects the core wire workability of the wire. Cr also causes an increase in the amount of low melting point compounds in the molten metal. Therefore, from the viewpoint of reducing the cost of the wire, improving the low temperature toughness of the weld metal, improving the core wire workability, and reducing the amount of low melting point compounds generated in the molten metal, it is preferable that the Mn content, Ni content, and Cr content in the wire each satisfy the above range, and the total of the Mn content, Ni content, and Cr content (Mn + Ni + Cr) is 47.0% or less.
• the total content of Mn, Ni and Cr (Mn+Ni+Cr) in the wire is more preferably 45.0% or less, 42.0% or less, or 40.0% or less.
• Mn and Ni are austenite stabilizing elements and improve the low temperature toughness of the weld metal.
• Ni is an expensive metal
• Mn is an element that reduces stacking fault energy and causes a decrease in toughness when added in excess.
• Ni improves toughness by increasing stacking fault energy. Therefore, from the viewpoint of improving the low-temperature toughness of the weld metal while suppressing the cost of the wire, it is preferable that the mass ratio of the Mn content to the Ni content (Ni/Mn) in the wire is set to 0.10 or more.
• the lower limit of the mass ratio (Ni/Mn) of the Mn content to the Ni content in the wire is more preferably 0.20, 0.30, 0.50, 0.60, 0.68, 1.00, 1.10, or 1.20.
• the upper limit of the mass ratio (Ni/Mn) of the Mn content to the Ni content in the wire is preferably 25.00, 20.00, 15.00, 10.00, 8.00, or 5.00.
• the fcc proportion in the wire is set to 70% or more.
• the fcc proportion is preferably 80% or more, or 90% or more, and may be 100%.
• the remainder of the structure is bcc.
• the solid wire according to the present disclosure may further include a lubricant applied to the wire surface.
• the lubricant applied to the wire surface has the effect of improving the wire feedability during welding.
• Various types of lubricants for welding wires e.g., vegetable oils such as palm oil
• PTFE oil polytetrafluoroethylene oil
• PFPE oil perfluoropolyether oil
• the solid wire according to the present disclosure may further include a plating layer formed on the wire surface. In this case, the lubricant is applied to the surface of the plating layer.
• the diameter of the solid wire according to the present disclosure is not particularly limited, but is, for example, ⁇ 1.6 to ⁇ 2.4 mm. Note that the diameter of a typical solid wire is ⁇ 1.6 to ⁇ 6.4 mm.
• the solid wire according to the present disclosure can be manufactured by the same manufacturing process as that for manufacturing a normal solid wire. That is, first, a steel having the above-mentioned chemical composition is melted, and then forged if necessary. After that, the steel is rolled into a rod shape. The rod-shaped steel is drawn to obtain a solid wire.
• the solid wire may be appropriately heat-treated so as not to impair feedability.
• a plating layer may be formed on the surface of the solid wire. In this case, the average chemical composition of the entire solid wire, including the chemical composition of the plating layer, must be within the above-mentioned range.
• a lubricant may be applied to the surface of the solid wire.
• a method for manufacturing a welded joint according to the present disclosure includes a step of submerged arc welding a steel material using the solid wire according to the present disclosure described above.
• the solid wire according to the present disclosure melts together with a part of the steel material to be welded by submerged arc welding and the flux, and becomes a weld metal after solidification.
• a welded joint manufactured by the welded joint manufacturing method according to the present disclosure has high strength and high toughness.
• a welded structure having a welded joint manufactured by the welded joint manufacturing method according to the present disclosure also has high strength and high toughness at the welded joint.
• submerged arc welding In submerged arc welding, granular flux is spread on the weld line in advance, the solid wire according to the present disclosure is fed into the flux, and welding is performed using the arc heat generated from the arc between the wire and the steel material in the flux.
• General submerged arc welding equipment can be applied.
• the submerged arc welding conditions may be those of a general method.
• the type of steel material (welded material) that serves as the base material of the welded joint is not particularly limited, but for example, Ni-based low-temperature steel containing 6% to 9% Ni with a plate thickness of 20 mm or more can be suitably used.
• the method for manufacturing a welded joint according to the present disclosure it is preferable to include a step of welding steel materials using the solid wire according to the present disclosure in one or more of the first pass to the final pass.
• the solid wire according to the present disclosure is used in the one pass.
• the polarity of the solid wire may be either positive or negative since the effect on the amount of diffusible hydrogen in the weld metal and the amount of spatter generation is negligibly small, but positive is preferred.
• the welded joint obtained by the welded joint manufacturing method according to the present disclosure comprises a base steel material and a welded part consisting of a weld metal and a weld heat affected zone.
• the welded joint according to the present disclosure is manufactured using the solid wire according to the present disclosure, and therefore comprises a weld metal having a good bead shape. Therefore, a welded structure having a welded joint manufactured by the welded joint manufacturing method according to the present disclosure also comprises a weld metal having a good bead shape. It is preferable that the tensile strength of the obtained welded metal is high, for example, 590 to 900 MPa.
• Solid wire manufacturing The solid wires of the present disclosure and the comparative examples were manufactured by the method described below. First, steel having the chemical compositions shown in Tables 1-A to 1-D was melted and then forged. The steel was then rolled into a rod shape, and the rod-shaped steel was drawn to obtain a solid wire. In this manner, a solid wire having a final wire diameter of ⁇ 2.4 mm was produced. The chemical components of the solid wire thus obtained were analyzed and found to be as shown in Tables 1-A to 1-D.
• the units of the contents of the chemical components of the wire shown in Tables 1-A to 1-D are mass % relative to the total mass of the solid wire.
• the balance of the wires shown in Tables 1-A to 1-D is iron and impurities.
• the solid wires shown in Tables 1-A to 1-D no lubricant was applied unless otherwise specified in the "Remarks" column.
• the wires marked “Coated” are those coated with lubricant.
• values outside the ranges specified in this disclosure are underlined.
• the blanks in the tables related to the content of a chemical component mean that the content of the chemical component is less than the significant digits. These chemical components may be unavoidably mixed or produced in amounts less than the significant digits.
• the solid wire for submerged arc welding according to the present disclosure has excellent low-temperature toughness of the weld metal.
• the comparative examples did not satisfy any of the requirements defined in this disclosure and therefore failed in one or more evaluation items.

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• 2022
  • 2022-09-30 EP EP22961042.3A patent/EP4596165A4/en active Pending
  • 2022-09-30 WO PCT/JP2022/036863 patent/WO2024069983A1/ja not_active Ceased
  • 2022-09-30 JP JP2023570046A patent/JP7492184B1/ja active Active
  • 2022-09-30 CN CN202280050741.3A patent/CN118119473A/zh active Pending
  • 2022-09-30 KR KR1020247001143A patent/KR20240046704A/ko active Pending
  • 2022-09-30 US US18/577,703 patent/US20250092498A1/en active Pending
• 2023
  • 2023-09-28 TW TW112137285A patent/TWI866500B/zh active

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