WO2023145330A1 - アーク溶接金属、溶接継手、及び自動車部材 - Google Patents

アーク溶接金属、溶接継手、及び自動車部材 Download PDF

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WO2023145330A1
WO2023145330A1 PCT/JP2022/047289 JP2022047289W WO2023145330A1 WO 2023145330 A1 WO2023145330 A1 WO 2023145330A1 JP 2022047289 W JP2022047289 W JP 2022047289W WO 2023145330 A1 WO2023145330 A1 WO 2023145330A1
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Prior art keywords
weld metal
less
content
arc
weld
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English (en)
French (fr)
Japanese (ja)
Inventor
和貴 松田
真二 児玉
正寛 松葉
欽也 石田
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Nippon Steel Corp
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Nippon Steel Corp
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Priority to US18/725,054 priority Critical patent/US20250059635A1/en
Priority to JP2023576707A priority patent/JP7727221B2/ja
Priority to EP22924177.3A priority patent/EP4470712A4/en
Priority to CN202280083431.1A priority patent/CN118401338A/zh
Publication of WO2023145330A1 publication Critical patent/WO2023145330A1/ja
Anticipated expiration legal-status Critical
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    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • 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
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/006—Vehicles
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode

Definitions

  • the present invention relates to arc weld metals, welded joints, and automotive components. This application claims priority based on Japanese Patent Application No. 2022-010976 filed in Japan on January 27, 2022, the contents of which are incorporated herein.
  • Corrosion resistance is also required for automobile parts. Therefore, not only hydrogen embrittlement resistance but also electrodeposition coating properties are required for arc welds provided at joints of automobile members.
  • Patent Document 1 discloses a weld metal formed by gas-shielded arc welding using a flux-cored wire, wherein C: 0.02 to 0.12% (meaning “% by mass” The chemical composition is the same below), Si: 0.10 to 2.00%, Mn: 0.90 to 2.5%, Ni: 0.20 to 3.5%, Ti: 0.040 to 0 .15%, N: 0.015% or less (excluding 0%), and O: 0.030 to 0.10%, the balance being iron and unavoidable impurities, and 2500 retained austenite particles Number / mm 2 or more, the volume fraction of retained austenite particles is 4.0% or more, and the ⁇ value represented by the following formula (1) is 75 or more.
  • ⁇ value 320 ⁇ [C]+50 ⁇ [Si]+15 ⁇ [Mn]+10 ⁇ [Ni]+28 ⁇ [Mo] (1)
  • [C], [Si], [Mn], [Ni] and [Mo] mean the content (% by mass) of C, Si, Mn, Ni and Mo, respectively.
  • Patent Document 2 C: 0.02 to 0.12% (meaning “mass%”; the same applies to the chemical composition below), Si: 0.18 to 2.00%, Mn: 0.90 to 2.5%, Ni: 1.0 to 3.5%, Cr: 0.3 to 2.0%, Al: 0.030% or less (excluding 0%), N: 0.015% or less ( 0%), and O: 0.050% or less (not including 0%), respectively, the balance being iron and inevitable impurities, and retained austenite particles having an equivalent circle diameter of 0.15 ⁇ m or more 2500 pieces / mm 2 or more, the volume fraction of the retained austenite phase is 4.3% or more with respect to the entire structure, and the ratio of the content of Cr and Mn [Cr]/[Mn] is 0.20
  • a weld metal having excellent resistance to hydrogen embrittlement and susceptibility characterized by the above is disclosed.
  • Patent Document 3 discloses a weld metal formed by gas-shielded arc welding using a flux-cored wire, wherein C: 0.02 to 0.12% (meaning "% by mass”. The chemical composition is described below. Same), Si: 0.10 to 2.00%, Mn: 0.90 to 2.5%, Ni: 0.20 to 3.5%, Ti: 0.040 to 0.15%, N: 0 .015% or less (not including 0%), and O: 0.030 to 0.10%, respectively, the balance being iron and unavoidable impurities, and 2500 or more retained austenite particles/mm 2 In addition, the volume fraction of retained austenite particles is 4.0% or more, and the ⁇ value represented by the following formula (1) is 75 or more.
  • ⁇ value 320 ⁇ [C]+50 ⁇ [Si]+15 ⁇ [Mn]+10 ⁇ [Ni]+28 ⁇ [Mo] (1)
  • [C], [Si], [Mn], [Ni] and [Mo] mean the content (% by mass) of C, Si, Mn, Ni and Mo, respectively.
  • Patent Document 4 in an arc welding method for steel plates having a C content of 0.08 to 0.30% by mass, using a welding wire having a total amount of Cr and Ni of 1.00% by mass or more, the following formula ( An arc welding method is disclosed in which welding is performed under the condition that X represented by 1) is 200 or less.
  • Patent Document 5 describes a fillet welded joint in which at least one steel plate has a thickness of 1 to 4 mm, in which (a) the volume fraction of martensite in the weld metal is 50% or more, and (b) the steel plate A high fatigue strength fillet welded joint is disclosed characterized by a weld toe angle formed in the face between 110 and 150 degrees.
  • the present invention provides an arc weld metal capable of improving both electrodeposition paintability and hydrogen embrittlement resistance of welds, and a welded joint and automobile excellent in both electrodeposition paintability and hydrogen embrittlement resistance of welds.
  • An object is to provide a member.
  • the gist of the present invention is as follows.
  • the arc weld metal according to one aspect of the present invention contains, in unit mass %, C: 0.10% or more and 0.30% or less, Si: 0.30% or more and 1.00% or less, and Mn: 1.0% or less. 30% or more and 3.00% or less, P: 0.0500% or less, S: 0.0100% or less, N: 0.0100% or less, O: 0.0200% or more and 0.0700% or less, Al, Ti, 5.00% or less in total of one or more selected from the group consisting of Cu, Ni, Cr, Mo, V, B, Nb, Zr, and Mg, the balance being iron and impurities, residual
  • the austenite volume fraction is 3.0% or more and 16.0% or less.
  • the arc welding metal described in (1) above is, in unit mass %, selected from the group consisting of Al, Ti, Cu, Ni, Cr, Mo, V, B, Nb, Zr, and Mg. The above may be contained in a total amount of 0.03% or more and 5.00% or less.
  • the Ni content, Cr content, Mo content, and V content are Ni/59+Cr/52+Mo/96+V/51 ⁇ 0.0200 % may be satisfied.
  • each element symbol is the content in mass % of each element.
  • the arc weld metal according to any one of (1) to (3) above may contain C: 0.13% or more and 0.30% or less in unit mass %.
  • the arc weld metal according to any one of (1) to (4) above may contain Ti: 0.025% or more and 0.120% or less in unit mass %.
  • the arc welding metal according to any one of the above (1) to (5) has, in unit mass%, Al: 0.01% or more and 0.20% or less, Ti: 0.020% or more and 0 .120% or less, Cu: 0.10% or more and 1.00% or less, Ni: 0.05% or more and 1.50% or less, Cr: 0.050% or more and 1.000% or less, Mo: 0.050% V: 0.050% to 0.300% B: 0.050% to 0.0600% Nb: 0.005% to 0.100% Zr: 0.005% to 0.100% 005% or more and 0.050% or less, and Mg: 0.0005% or more and 0.0100% or less.
  • a welded joint according to another aspect of the present invention comprises a plurality of base material steel plates and an arc welding metal that joins the plurality of base material steel plates, wherein the arc weld metal includes the above (1) to (5), wherein the Si content of each of the plurality of base material steel sheets is 0.60% or more and 2.00% or less in mass%, and the plurality of the At least one of the base material steel plates may have a thickness of 4.0 mm or less.
  • the arc weld metal is the arc weld metal described in (6) above, and the Si content of each of the plurality of base material steel plates is 0.60% or more in mass%.
  • the thickness of at least one of the plurality of base material steel plates may be 4.0 mm or less (9)
  • the plurality of base materials At least one of the steel plates may have a tensile strength of 980 MPa or more.
  • at least one of the plurality of base material steel plates may have a tensile strength of 980 MPa or more.
  • An automobile member according to another aspect of the present invention includes the welded joint according to (7) above.
  • An automobile member according to another aspect of the present invention includes the welded joint according to (8) above.
  • an arc weld metal capable of improving both the electrodeposition paintability and the hydrogen embrittlement resistance of the weld, and a welded joint excellent in both the electrodeposition paintability and the hydrogen embrittlement resistance of the weld and automobile parts.
  • FIG. 2 is a schematic diagram of an analysis method when measuring chemical components of weld metal using emission spectrometry.
  • FIG. 2 is a schematic diagram of an analysis method when chemical analysis is used to measure the chemical composition of weld metal;
  • FIG. 2 is a schematic diagram of an analysis method for measuring the amount of retained austenite in weld metal;
  • FIG. 4 is a cross-sectional schematic diagram of a weld metal and a welded joint when the welded joint is a lap fillet joint;
  • FIG. 4 is a cross-sectional schematic diagram of a weld metal and a welded joint when the welded joint is a T-shaped fillet joint; It is a schematic diagram of a paintability evaluation area.
  • arc weld metal may be simply referred to as weld metal.
  • the present inventors have found that hydrogen embrittlement resistance is improved by generating retained austenite in the weld metal. Specifically, the present inventors have found that retained austenite can be used to trap hydrogen penetrating into the weld metal, suppress hydrogen diffusion into stress concentration areas, and thereby suppress hydrogen embrittlement.
  • the arc weld metal according to the first embodiment of the present invention is unit mass%, C: 0.10% or more and 0.30% or less Si: 0.30% or more and 1.00% or less Mn: 1.30% or more and 3.00% or less P: 0.0500% or less S: 0.0100% or less N: 0.0100% or less O: 0.0200% or more and 0.0700% or less Al, Ti, Cu, Ni, Cr, Mo, V, B, Nb, Zr, and one or more selected from the group consisting of Mg , in total 5.00% or less, and the balance consists of iron and impurities. Furthermore, the arc weld metal according to the present embodiment has a retained austenite volume fraction of 3.0% or more and 16.0% or less.
  • "%" indicating the content of an element means "% by mass”.
  • C (C: 0.10% or more and 0.30% or less) C is an important element that affects the strength of the weld metal. If the C content in the weld metal is less than 0.10%, the strength of the weld metal will be insufficient. Furthermore, when the C content in the weld metal is less than 0.10%, the amount of retained austenite in the weld metal is insufficient. On the other hand, when the C content in the weld metal exceeds 0.30%, the toughness of the weld metal is impaired. Therefore, the C content of the weld metal should be 0.10% or more and 0.30% or less.
  • the C content of the weld metal is preferably 0.12% or more, 0.13% or more, 0.14% or more, 0.15% or more, or 0.18% or more.
  • the C content of the weld metal is preferably 0.28% or less, 0.25% or less, 0.22% or less, or 0.20% or less.
  • the most preferable C content is considered to be in the range of 0.14% or more and 0.2% or less.
  • Si suppresses the formation of carbides and stabilizes retained austenite. Si also contributes to deoxidation of the weld metal. These effects cannot be obtained if the Si content of the weld metal is less than 0.30%. On the other hand, if the Si content of the weld metal exceeds 1.00%, the amount of insulating welding slag increases, impairing the electrodeposition coating properties of the weld metal. Therefore, the Si content of the weld metal should be 0.30% or more and 1.00% or less.
  • the Si content of the weld metal is preferably 0.35% or more, 0.40% or more, or 0.50% or more.
  • the Si content of the weld metal is preferably 0.95% or less, 0.90% or less, or 0.80% or less.
  • Mn is an important element that improves the hardenability of weld metal. Also, Mn concentrates in the austenite phase together with C and stabilizes the austenite phase. If the Mn content of the weld metal is less than 1.30%, the hardenability is insufficient and the strength of the weld metal is insufficient. On the other hand, when the Mn content of the weld metal exceeds 3.00%, the toughness of the weld metal is impaired. Therefore, the Mn content of the weld metal should be 1.30% or more and 3.00% or less. The Mn content of the weld metal is preferably 1.50% or more, 1.80% or more, or 2.00% or more. The Mn content of the weld metal is preferably 2.80% or less, 2.50% or less, or 2.20% or less.
  • P is an impurity.
  • the P content of the weld metal should be 0.0500% or less.
  • the P content is preferably 0.0450% or less, 0.0400% or less, or 0.0300% or less. From the viewpoint of ensuring the toughness of welded joints, the smaller the P content, the better. Therefore, the lower limit of P content is not defined.
  • the lower limit of the P content may be 0%. However, considering the production cost of the welded joint, the P content of the weld metal may be 0.0005% or more, 0.0010% or more, or 0.0100% or more.
  • S is an impurity. If the S content in the weld metal exceeds 0.0100%, S segregates at the grain boundaries of the weld metal, impairing the toughness of the weld metal. Therefore, the S content of the weld metal should be 0.0100% or less.
  • the S content is preferably 0.0080% or less, 0.0060% or less, or 0.0050% or less. From the viewpoint of ensuring the toughness of welded joints, the smaller the S content, the better. Therefore, the lower limit of the S content is not defined.
  • the lower limit of the S content may be 0%. However, considering the production cost of the welded joint, the S content of the weld metal may be 0.0005% or more, 0.0010% or more, or 0.0030% or more.
  • N is an element that penetrates into the weld metal during welding. Although N contributes to increasing the strength of the weld metal, an excessive N content reduces the toughness of the weld metal. Therefore, the upper limit of the N content is set to 0.0100%.
  • the N content may be 0.0080% or less, 0.0070% or less, or 0.0060% or less.
  • the strength is secured by elements other than N, so the lower limit of the N content is not set.
  • the lower limit of the N content may be 0%.
  • the N content may be 0.0001% or more, 0.0010% or more, or 0.0030% or more.
  • O is an element that penetrates into the weld metal during welding. Since O forms an oxide in the weld metal, an excessive content of O causes a decrease in the toughness of the weld metal. Therefore, the upper limit of the O content is set to 0.07%.
  • the O content may be 0.06% or less, 0.05% or less, or 0.04% or less. From the viewpoint of ensuring the toughness of welded joints, the smaller the O content, the better. Therefore, the lower limit of the O content may be 0%.
  • the O content may be 0.025% or more, 0.03% or more, or 0.035% or more.
  • the rest of the chemical composition of the weld metal consists of iron and impurities.
  • Impurities include raw materials such as ores or scraps when industrially manufacturing the base material and filler material, or components mixed in due to various factors in the manufacturing process, or welding when the base material is welded. It means a component that is mixed from the environment and is allowed within a range that does not adversely affect the weld metal according to the present embodiment.
  • the weld metal may contain the following arbitrary elements in place of part of the remaining iron.
  • Al deoxidizes the weld metal.
  • Ti deoxidizes the weld metal and refines the structure of the weld metal.
  • Cu improves welding workability and hardenability of the weld metal.
  • Ni improves the low temperature toughness of the weld metal.
  • Cr, Mo, V, and B improve the hardenability of the weld metal.
  • Nb refines the structure of the weld metal.
  • Zr improves the strength of the weld metal.
  • Mg deoxidizes the weld metal.
  • these elements may be contained in the weld metal.
  • the total content of these arbitrary elements may be 0.03% or more, 0.10% or more, 0.50% or more, or 1.50% or more.
  • the total content of these optional elements may be 5.00% or less, 3.50% or less, 2.50% or less, or 2.20% or less.
  • these optional elements are often contained in high-strength steel sheets.
  • the weld metal is formed by melting and mixing the base material on which the weld metal is provided and the filler material. Therefore, when the base metal on which the weld metal is provided is a high-strength steel plate, these optional elements may migrate from the base metal to the weld metal. On the other hand, these optional elements are not essential from the viewpoint of ensuring electrodeposition paintability and hydrogen embrittlement resistance of the weld zone.
  • the insulating slag which adversely affects the electrodeposition paintability, is mainly composed of Si, it is possible to ensure the electrodeposition paintability by controlling the Si content within the above range.
  • Hydrogen trapping for improving hydrogen embrittlement resistance is performed using retained austenite, which will be described later, but the above-mentioned arbitrary elements do not greatly affect the amount of retained austenite.
  • Mitsuru Tanino et al. "Chemistry of Iron and Steel Materials” (Okaku Uchida, 2001, pp. 103-104) lists C, N, Mn, Ni, and Cu as examples of austenite-forming elements. , C are of particular importance.
  • Masashi Maki et al. "Effect of grain size on transformation-induced plasticity of metastable Fe--Ni--C austenite" (Journal of the Japan Institute of Metals, Vol. 38, pp.
  • the total content of these optional elements may be 0%. Also, when the total content of various optional elements is specified as above, it is not necessary to specify the content of each optional element independently. On the other hand, instead of specifying the total content of various optional elements, or in addition to this, the content of each optional element may be specified independently as follows.
  • the weld metal may contain Al.
  • the Al content may be 0%, the above effect can be preferably obtained by setting the Al content to 0.01% or more, for example.
  • the Al content may be 0.05% or more, 0.08% or more, or 0.10% or more.
  • the Al content may be 0%.
  • the Al content of the weld metal is 0.20% or less, it is possible to avoid the precipitation of an excessive amount of alumina-based oxide in the weld metal and further improve the toughness of the weld metal.
  • the Al content may be 0.18% or less, 0.15% or less, or 0.12% or less.
  • Ti deoxidizes the weld metal and further refines the structure of the weld metal.
  • Ti contained in the filler metal which is the material of the weld metal, has the function of improving the electrical conductivity of the slag adhering to the surface of the weld metal and further enhancing the electrodeposition coating properties. Therefore, a Ti-containing weld metal obtained from a Ti-containing filler material has high electrodeposition coatability.
  • the Ti content may be 0%, these effects can be preferably obtained by setting the Ti content of the weld metal to 0.020% or more, for example.
  • the Ti content may be 0.025% or more, 0.030% or more, 0.050% or more, 0.060% or more, or 0.100% or more.
  • the Ti content may be 0.100% or less, 0.080% or less, or 0.060% or less.
  • the weld metal may contain Cu.
  • the Cu content may be 0%, but by setting the Cu content to 0.10% or more, 0.20% or more, or 0.30% or more, the above effects can be preferably obtained.
  • the toughness of the weld metal can be further improved.
  • the Cu content may be 0.90% or less, 0.80% or less, or 0.60% or less.
  • the weld metal may contain Ni.
  • the Ni content may be 0%, but by setting the Ni content to 0.05% or more, 0.10% or more, or 0.12% or more, the above effects can be preferably obtained.
  • the Ni content of the weld metal is 1.50% or less, excessive hardening of the weld metal can be avoided and the toughness of the weld metal can be stably ensured.
  • the Ni content may be 1.00% or less, 0.95% or less, 0.50% or less, 0.20% or less, 0.19% or less, or 0.15% or less.
  • the weld metal may contain Cr.
  • the Cr content may be 0%, the above effects can be preferably obtained by setting the Cr content to, for example, 0.050% or more, 0.100% or more, or 0.120% or more.
  • the Cr content of the weld metal is 1.000% or less, the alloy cost is reduced, which is economically advantageous.
  • the Cr content may be 0.900% or less, 0.800% or less, or 0.600% or less.
  • the weld metal may contain Mo. Although 0% of Mo content may be sufficient, the above-mentioned effect can be obtained preferably by setting Mo content to 0.050% or more, 0.100% or more, or 0.120% or more, for example. In addition, if the Mo content of the weld metal is 1.000% or less, the alloy cost is reduced, which is economically advantageous. Furthermore, by setting the Mo content of the weld metal to 1.000% or less, the toughness of the weld metal can be further improved. The Mo content may be 0.900% or less, 0.800% or less, or 0.600% or less.
  • V improves the hardenability of the weld metal. Therefore, V may be contained in the weld metal.
  • the V content may be 0%, but by setting the V content to 0.050% or more, 0.100% or more, or 0.120% or more, the above effect can be preferably obtained.
  • the V content of the weld metal is 0.300% or less, the alloy costs are reduced, which is economically advantageous.
  • the toughness of the weld metal can be further improved.
  • the V content may be 0.280% or less, 0.250% or less, or 0.200% or less.
  • B improves the hardenability of the weld metal. Therefore, B may be contained in the weld metal.
  • the B content may be 0%, but by setting the B content to, for example, 0.0005% or more, 0.0010% or more, or 0.0050% or more, the above effects can be preferably obtained.
  • the toughness of the weld metal can be further improved.
  • the B content may be 0.0500% or less, 0.0450% or less, or 0.0400% or less.
  • the weld metal may contain Nb.
  • the Nb content may be 0%, but by setting the Nb content to, for example, 0.005% or more, 0.010% or more, or 0.020% or more, the above effects can be preferably obtained.
  • the toughness of the weld metal can be further improved.
  • the Nb content may be 0.080% or less, 0.050% or less, or 0.040% or less.
  • the weld metal may contain Zr.
  • the Zr content may be 0%, but by setting the Zr content to 0.005% or more, 0.006% or more, or 0.007% or more, the above effects can be preferably obtained.
  • the Zr content may be 0.040% or less, 0.035% or less, or 0.030% or less.
  • Mg is an element added for deoxidizing the weld metal. Therefore, the weld metal may contain Mg.
  • the Mg content may be 0%, but by setting the Mg content to, for example, 0.0005% or more, 0.0007% or more, or 0.0010% or more, the above effects can be preferably obtained.
  • the Mg content of the weld metal is 0.0100% or less, it is possible to avoid a decrease in the toughness of the weld metal.
  • the Mg content may be 0.0050% or less, or 0.0030% or less.
  • the stress concentration portion is, for example, the vicinity of the root portion.
  • the retained austenite phase contained in the weld metal traps the hydrogen that has entered the weld metal during arc welding, thereby reducing the hydrogen concentration at the stress concentration sites such as the tip of the root part and improving the hydrogen resistance of the weld metal. Embrittlement properties can be improved.
  • the volume fraction of retained austenite may be 4.0% or more, 5.0% or more, or 8.0% or more.
  • the upper limit of the volume fraction of retained austenite is not particularly limited, considering the chemical composition of the weld metal according to this embodiment, it is estimated that it is difficult to increase the volume fraction of retained austenite to more than 16.0%. Therefore, the volume fraction of retained austenite may be 16.0% or less, 15.0% or less, or 13.0% or less.
  • the remainder of the metallographic structure of the weld metal is not particularly limited.
  • the remainder of the metallographic structure may be composed of, for example, ferrite and martensite.
  • the volume fraction of martensite in the weld metal is more preferably less than 50%, 48% or less, 45% or less, or 40% or less.
  • Ni, Cr, Mo, and V contained in the weld metal have the effect of improving the hardenability of the weld metal, but may form precipitates in the weld metal and reduce the toughness of the weld metal. Therefore, the parameter A obtained by substituting the Ni content, Cr content, Mo content, and V content into the following formula is preferably less than 0.0200%.
  • Parameter A Ni/59 + Cr/52 + Mo/96 + V/51
  • the Ni content, Cr content, Mo content, and V content are Ni/59+Cr/52+Mo/96+V/51 ⁇ 0.0200% is preferably satisfied.
  • Parameter A is more preferably less than 0.0100%, or less than 0.0050%.
  • each element symbol is the content in mass % of each element.
  • the weld metal may be surface-treated.
  • a chemical conversion coating, plating, coating, or the like may be provided on the surface of the weld metal.
  • plating include hot-dip galvanizing, alloying hot-dip galvanizing, electro-galvanizing, hot-dip aluminizing, and electro-aluminizing.
  • a suitable example of the coating film is an electrodeposition coating film or the like.
  • the weld metal may be subjected to blasting such as shot blasting and wet blasting, peening such as UIT and hammer peening, and grinding with a grinder or the like. Hydrogen embrittlement cracking of weld metal occurs within a relatively short period of time after completion of welding. Therefore, it is considered that the post-treatment that is performed after a while from the end of welding does not affect the frequency of occurrence of hydrogen embrittlement cracking in the weld metal.
  • Emission spectroscopic analysis is suitable for joints that can secure a wide analysis surface
  • chemical analysis is suitable for joints that can secure a large amount of test pieces.
  • Two measurement methods can be used depending on the actual situation of the joint. The analysis results are almost the same regardless of which method is used.
  • the emission spectroscopic analysis it is preferable to perform, for example, three or more measurements and regard the average value as the chemical composition of the weld metal.
  • FIG. 1 is a diagram for explaining a method of measuring the chemical composition of a weld metal 1 by optical emission spectrometry in a welded joint 2 formed by lap fillet welding two base steel plates 21 .
  • FIG. 1 is a diagram schematically showing a part of the cross section of the welded joint 2 in the direction perpendicular to the longitudinal direction of the weld metal 1. As shown in FIG.
  • the weld metal 1 is cut so as to expose the inside of the weld metal 1, and is appropriately prepared.
  • the weld joint 2 in which the weld metal 1 is arranged is a lap fillet joint, as shown in FIG.
  • the weld metal 1 is cut and polished so that the surface of the other base metal steel plate 21 (the base metal steel plate 21 indicated by the solid line) and the cross section of the weld metal 1 are included in the same plane.
  • the weld metal 1 is subjected to emission spectroscopic analysis.
  • the fusion boundary which is the boundary between the weld metal 1 and the base material steel plate 21, and its vicinity are not included in the analysis area.
  • the area within 100 ⁇ m from the fusion boundary should be excluded from the analysis area. This is because the components of the base steel plate 21 tend to be concentrated in the vicinity of the fusion boundary and have components different from the average components of the weld metal 1 .
  • the area within 100 ⁇ m from the fusion boundary may be excluded from the analysis area and the cross section of the weld metal may be subjected to optical emission spectroscopic analysis.
  • FIG. 2 is a diagram for explaining a method of measuring the chemical composition of the weld metal 1 by chemical analysis in the welded joint 2 formed by lap fillet welding two base steel plates 21 .
  • FIG. 2 is a diagram schematically showing a part of the cross section of the welded joint 2 in the direction perpendicular to the longitudinal direction of the weld metal 1.
  • weld metal 1 is sampled from weld joint 2 .
  • the sampling position of the weld metal 1 is set at a position separated from the fusion boundary by 100 ⁇ m or more.
  • the welded metal 1 may be sampled as shown in FIG.
  • the hatched portions in FIG. 2 are locations where the weld metal 1 is sampled.
  • the surface of the weld metal 1 may have dirt such as slag, the outermost layer of the weld metal 1 is not analyzed. Therefore, it is necessary to grind the surface of the weld metal 1 before extracting the weld metal 1 . Then, the sampled weld metal 1 may be subjected to a normal chemical analysis. Even if the shape of the welded joint is not the lap fillet joint illustrated in FIG.
  • good measurement results can be obtained by sampling the weld metal 1 while avoiding the area within 100 ⁇ m from the fusion boundary. For example, proper erosion of a cross-section of a welded joint containing weld metal will result in a distinct fusion boundary. By making the fusion boundary clear in this way, the weld metal can be collected while avoiding the region within 100 ⁇ m from the fusion boundary, regardless of the shape of the welded joint. It should be noted that the position from which the weld metal is sampled is preferably the bead stationary portion.
  • FIG. 3 is a diagram for explaining a method of measuring the retained austenite volume fraction of the weld metal 1 in the welded joint 2 formed by lap fillet welding two base steel plates 21 .
  • FIG. 3 is a diagram schematically showing a part of the cross section of the welded joint 2 in the direction perpendicular to the longitudinal direction of the weld metal 1.
  • the method for measuring the volume fraction of retained austenite in weld metal 1 is as follows. First, the weld metal 1 is cut so as to expose the inside of the weld metal 1, and the cut surface is appropriately prepared.
  • the welded joint 2 with the welded metal 1 is a lap fillet joint
  • the welded metal 1 may be cut perpendicularly to the welding direction as shown in FIG.
  • an analysis using an X-ray diffractometer is performed in a region separated from the outer periphery of the weld metal 1 by 100 ⁇ m or more.
  • the outer circumference of the weld metal 1 is a concept including both the fusion boundary between the weld metal 1 and the base metal steel plate 21 and the surface of the weld metal 1 .
  • the area enclosed by the dashed line is the analysis area.
  • the fraction of the austenite phase is determined. Specifically, the X-ray diffraction result is substituted into the following formula to obtain the austenite phase fraction.
  • V l ⁇ /( l ⁇ + l ⁇ )
  • the fraction of martensite is included in the fraction of ferrite. This is because the crystal structure of martensite generated in steel with C: 0.10% or more and 0.30% or less is almost the same as that of ferrite.
  • the method for measuring the martensite area ratio of the weld metal is as follows. First, a cross-sectional observation sample of the weld metal is produced. Next, the cross section is subjected to nital corrosion to expose the structure. Then, the cross section of the weld metal is observed with a scanning electron microscope (SEM) for five fields of view, and the area of the martensite structure within each field of view is determined. Then, the area ratio of martensite is calculated by dividing the area of martensite by the viewing area.
  • the measurement area is an area separated from the outer periphery of the weld metal 1 by 100 ⁇ m or more. That is, the area ratio of martensite is measured within the region surrounded by the dashed line in FIG.
  • the welded joint 2 according to the second embodiment includes a plurality of base material steel plates 21 and an arc weld metal 1 that joins the plurality of base material steel plates 21, as shown in FIG. 4 or FIG.
  • This arc weld metal 1 is the arc weld metal 1 according to the first embodiment described above.
  • the figure shows an example in which two base steel plates 21 are used, the number of base steel plates 21 may be plural, and three or more base steel plates may be joined by the arc welding metal 1. good.
  • the Si content of each of the plurality of base material steel plates 21 is 0.60% or more and 2.00% or less.
  • the shape of the welded joint 2 is not particularly limited.
  • the welded joint 2 according to this embodiment may be the lap fillet joint shown in FIG. 4 or the T-shaped fillet joint shown in FIG.
  • various shapes such as butt weld joints can be applied to the weld joint 2 according to this embodiment.
  • the welded joint 2 has high resistance to hydrogen embrittlement and high electrodeposition paintability in the weld metal 1 .
  • At least one of the plurality of base material steel plates has a thickness of 4.0 mm or less. More preferably, the thickness of at least one of the plurality of base steel plates is 3.8 mm or less, 3.5 mm or less, or 3.0 mm or less. Thereby, the strength of the welded joint 2 can be increased.
  • various preferred aspects of the weld metal 1 according to the first embodiment can be applied to the weld metal 1 of the weld joint 2 according to this embodiment.
  • the Si content in each of the plurality of base steel plates 21 forming the welded joint 2 must be 0.60% or more and 2.00% or less.
  • the Si content of the base metal steel plate 21 exceeds 2.00%, even if the Si content of the weld metal 1 is within the above range, the surface of the base metal steel plate 21 of the weld metal 1 In the vicinity, an insulating slag containing Si as a main component is formed, impairing the electrodeposition coating properties of the weld metal 1 .
  • the Si content of the base steel plate 21 is preferably 1.80% or less, 1.60% or less, or 1.40% or less.
  • the Si content of the base steel plate 21 is less than 0.60%, the adhesion of the oxide scale formed on the surface of the base steel plate 21 during arc welding is impaired, and the coating film is formed together with the oxide scale. The peeling impairs the electrodeposition coating properties of the base steel plate 21 .
  • the Si content of the base steel plate 21 is preferably 0.80% or more, 1.00% or more, or 1.20% or more.
  • the structure of the base steel plate is not particularly limited, but preferred examples are given below.
  • the tensile strength of the base steel plate is not particularly limited, for example, the tensile strength of at least one of the plurality of base steel plates is preferably 980 MPa or higher, 1000 MPa or higher, 1200 MPa or higher, or 1400 MPa or higher. This makes it easy to apply the welded joint according to the present embodiment to automobile members.
  • the base material steel plate may be surface-treated.
  • the base steel sheet may have a chemical conversion treatment film, plating, coating film, or the like.
  • plating include hot-dip galvanizing, alloying hot-dip galvanizing, electro-galvanizing, hot-dip aluminizing, and electro-aluminizing.
  • a suitable example of the coating film is an electrodeposition coating film or the like.
  • the weld metal may be subjected to blasting such as shot blasting and wet blasting.
  • the base steel plate and the weld metal are subjected to blasting treatment after welding in order to remove scales and the like adhering to the surface of the steel plate before welding.
  • peening treatments such as UIT and hammer peening, and grinding with a grinder or the like may be applied to the weld metal and its surrounding base metal.
  • Hydrogen embrittlement cracking of weld metal occurs within a relatively short period of time after completion of welding. Therefore, it is considered that the post-treatment that is performed after a while from the end of welding does not affect the frequency of occurrence of hydrogen embrittlement cracking in the weld metal.
  • a motor vehicle component according to a third embodiment comprises a welded joint according to the second embodiment.
  • the automobile component according to the present embodiment has high hydrogen embrittlement resistance and high electrodeposition coating properties in both the weld metal and the base steel plate.
  • various preferred aspects of the welded joint according to the second embodiment can be applied to the welded joint of the automobile part according to this embodiment. Also, not all joints of automobile parts need to be welded joints according to the second embodiment.
  • a preferred example of the method for producing arc-welded metal includes the step of arc-welding a plurality of base material steel plates to obtain arc-welded metal.
  • the Si content of each of the plurality of base material steel sheets is set to 2.00% or less.
  • the composition of the arc weld metal is within the range of the chemical composition of the arc weld metal according to the first embodiment.
  • the average cooling rate between 800° C. and 300° C. is set to 40° C./second to 15° C./second.
  • each Si content must be 2.00% or less. As a result, it is possible to suppress the formation of insulating slag in the vicinity of the base steel plate on the surface of the weld metal, and to ensure the electrodeposition coating properties. If it is necessary to ensure not only the weld metal but also the electrodeposition coating of the base steel plate, the lower limit of the Si content of the base steel plate is set to 0.60% or more.
  • the preferred Si content of the base steel plate conforms to the base steel plate of the welded joint according to the second embodiment.
  • Arc welding is fusion welding using an electric arc as a heat source.
  • filler material such as welding wire, welding rod, etc. may be supplied to the arc weld.
  • Weld metal is metal that melts and solidifies during welding. Weld metal is formed by mixing and solidifying molten base steel plate and filler metal. Therefore, the composition of the weld metal can be controlled through the chemical composition of the base steel plate, the chemical composition of the filler metal, and the mixing ratio of the base steel plate and the filler metal. The mixing ratio of the base material steel plate and the filler material can be controlled through the filler material feeding speed, heat input, welding speed, etc. during arc welding. Additionally, the yield rate of alloying elements can also be considered in controlling the composition of the weld metal.
  • the yield rate is the amount of elements remaining in the weld metal after welding, relative to the amount of elements contained in the base steel plate and filler metal before welding. For example, the yield rate of Al, which is easily oxidized to generate slag, is low.
  • the yield rate under certain welding conditions can be estimated by preparing welded joints under the same welding conditions and analyzing the components of the weld metal.
  • the composition of the arc weld metal should be set within the range of the composition of the arc weld metal according to the first embodiment while considering these factors comprehensively.
  • the average cooling rate between 800° C. and 300° C. is set to 40° C./second to 15° C./second.
  • phase transformation from austenite to martensite may be accelerated and the amount of retained austenite may be insufficient.
  • the average cooling rate of the arc weld metal is less than 15° C./second, the phase transformation from austenite to ferrite may be accelerated and the amount of retained austenite may become insufficient.
  • the cooling rate of the arc weld metal is determined according to the heat input during arc welding, the ambient temperature after arc welding, and the total thickness of the multiple base steel plates. As the total plate thickness of the base steel plate increases, the amount of heat transfer from the weld metal to the base steel plate increases, and the average cooling rate increases. The lower the atmosphere temperature, the greater the amount of heat transfer from the weld metal to the atmosphere, and the higher the average cooling rate. The larger the heat input, the higher the temperature of the base steel plate, the smaller the amount of heat transfer from the weld metal to the base steel plate, and the lower the average cooling rate. Therefore, by appropriately combining these factors, the average cooling rate of the arc weld metal can be made within the above range.
  • the amount of heat input is determined according to the current value, voltage value, and welding speed during arc welding. As long as the average cooling rate of the arc-welded metal is within the range described above, various welding conditions can be employed according to the thickness, composition, etc. of the steel plate.
  • Example 1 Various welded joints with arc-welded metal were produced by arc-welding steel plates A to D with a thickness of 2.9 mm. Table 1 shows the tensile strength and Si content of steel sheets A to D.
  • Arc welding conditions were as follows.
  • ⁇ Welding type lap fillet welding
  • ⁇ Shape of the upper plate that is, the plate to which the end face is welded: A rectangle of 150 mm in width and 40 mm in height Rectangular ⁇ Overlapping allowance of upper plate and lower plate: 10 mm
  • ⁇ Welding current 220 to 235A
  • ⁇ Welding voltage 21-26V
  • ⁇ Welding speed 0.8m/min
  • ⁇ Welding length 100mm
  • ⁇ Energization mode DC pulse mode
  • ⁇ Shielding gas type The following two types: (1) Ar + 20% CO 2 shielding gas with H 2 added so that the partial pressure is 0.5% (2) Ar + 20% CO A gas obtained by adding H 2 to the shield gas of No.
  • the composition of the weld metal was appropriately adjusted using a filler metal. Further, after arc welding under the above conditions, the average cooling rate of the weld metal from 800°C to 300°C was set within the range of 30°C/second to 17°C/second.
  • the evaluation of the hydrogen embrittlement resistance of the weld metal was carried out as follows. After 24 hours from the end of arc welding, the welded joint was cut perpendicular to the welding direction, and the root portion was observed to confirm the presence or absence of cracks. The evaluation criteria were as follows. ⁇ Shield gas type (1) Cracked weld metal: C ⁇ Weld metal where cracks did not occur with shielding gas type (1) and cracks occurred with (2): B ⁇ Weld metal in which cracks did not occur in both shield gas types (1) and (2): A
  • FIG. 6 shows a schematic diagram of the paintability evaluation area.
  • the horizontal direction in FIG. 6 is called the horizontal direction
  • the vertical direction in FIG. 6 is called the vertical direction.
  • the range of the paintability evaluation area in the horizontal direction and the vertical direction is as follows. area. The lateral extent of the paintability evaluation area is 30 mm along the longitudinal direction of the weld metal 1 .
  • the range of the paintability evaluation area in the vertical direction is from a position away from the weld toe on one side of the weld metal 1 by "the width direction length of the weld metal 1 (weld bead width) ⁇ 60%" to the other side of the weld metal 1.
  • the range is from the weld toe to the position separated by "the width direction length of the weld metal 1 (weld bead width) x 60%".
  • Defective portions of electrodeposition coating included in the paintability evaluation area were identified. Then, using image analysis software, the ratio of the electrodeposition coating defect portion occupying the coating performance evaluation area was calculated.
  • the evaluation criteria were as follows. ⁇ Percentage of electrodeposition coating defects exceeds 10% by area: C ⁇ Percentage of defective parts of electrodeposition coating is more than 5% by area and 10% by area or less: B ⁇ The percentage of electrodeposition coating defects is 5% or less by area: A
  • the chemical composition of the weld metal was obtained by emission spectroscopic analysis and listed in the table. In addition, the measurement was performed 3 times and the average value was described in the table
  • the amount of retained austenite and the amount of martensite in the weld metal were determined by the method described above.
  • the amount of retained austenite in the weld metal is shown in the table. Since the amount of martensite in the weld metal was within the range of 30 area % or more and 45 area % or less, the description is omitted in the table.
  • the evaluation of cracking was particularly excellent. It is considered that this is because the toughness of the weld metal was improved when the parameter A was less than 0.0200%.
  • Example 2 No. disclosed in the table.
  • a welded joint was manufactured using the same base material steel plate, filler material, and welding conditions as in Example 1.
  • the weld metal was quenched by immersing the welded joint in liquid nitrogen after the end of welding.
  • the average cooling rate of the weld metal from 800° C. to 300° C. was 100° C./second or more and 200° C./second or less.

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MITSURU TANINO ET AL.: "Chemistry of Steel Material", UCHIDA ROKAKUHO, 2001, pages 103 - 104
THE JOURNAL OF THE JAPAN INSTITUTE OF METALS, vol. 38, 1974, pages 871 - 876

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