Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Nippon Steel & Sumikin Welding Co., Ltd.

Nippon Steel Welding & Engineering Co., Ltd.

Yasuhito Totsuka

Kiyohito Sasaki

Rikiya Takayama

Shuichi Nakamura

Hiroki Fujimoto

Kazuhiro Kojima

Kotaro Watanabe

Ryuichi Shimura

Masaaki Toriyabe

Tatsuya Kumagai

Shimura Ryuichi

A flux-cored wire according to an aspect of the present invention includes: a steel sheath; and a flux filling the inside of the steel sheath, in which the flux contains 0.11% or more in total of a fluoride in terms of F-equivalent value, 4.30% to 7.50% of a Ti oxide in terms of TiOequivalent, 0.30% to 2.40% in total of an oxide in terms of mass %, and 0% to 0.60% in total of a carbonate in terms of mass %, the amount of a Ca oxide in terms of CaO is less than 0.20% in terms of mass %, the amount of CaFis less than 0.50%, a chemical composition of the flux-cored wire is within a predetermined range, a Z value is 2.00% or less, a V value is 5.0 to 27.0, and Ceq is 0.30% to 1.00% or less.

Flux-cored wire, manufacturing method of welded joint, and welded joint

According to an aspect of the present invention, there is provided a flux-cored wire including a steel sheath and a flux that fills the steel sheath. The flux contains fluorides of which a total value &#x3b1; of F-equivalent values is 0.21% or more, oxides of which the total value &#x3b2; of amounts ranges from 0.30% to less than 3.50%, and carbonates of which a total value of amounts ranges from 0% to 3.50%. An amount of CaO ranges from 0% to less than 0.20%. An amount of iron powder ranges from 0% to less than 10.0%. A X-value is 5.0% or less. The amount of CaFis less than 0.50%. The amount of Ti oxides ranges from 0.10% to less than 2.50%. A ratio of &#x3b1; to &#x3b2; ranges from 0.10 to 4.00. A total value of amounts of MgCO, NaCO, and LiCOranges from 0% to 3.00%. Other chemical composition is within a predetermined range. Ceq ranges from 0.45% to 1.20%.

A wire includes, in terms of % by mass with respect to a total mass of the wire, as a total in a steel outer skin and a flux, 0.03 to 0.09% of C, 0.1 to 0.6% of Si, 1.3 to 2.6% of Mn, 0.01 to 0.5% of Cu, 0.05 to 0.5% of Ti, 0.002 to 0.015% of B, and 0.05% or less of Al, and further including, in the flux, 5 to 9% in terms of TiO, 0.1 to 0.6% of in terms of SiO, 0.02 to 0.3% in terms of AlO, 0.1 to 0.8% of Mg, 0.05 to 0.3% in terms of F, 0.05 to 0.3% in terms of Na and K in a fluorine compound, 0.05 to 0.2% of NaO and KO, and 0.1% or less in terms of ZrO.

Flux-cored wire for Ar&#x2014;COmixed gas shielded arc welding

A flux-cored wire for carbon dioxide gas shielded arc welding including, in terms of % by mass with respect to a total mass of the wire, 0.03 to 0.08% of C, 0.2 to 0.7% of Si, 1.4 to 3.0% of Mn, 0.01 to 0.5% of Cu, 0.8 to 3.0% of Ni, 0.05 to 0.5% of Ti, 0.002 to 0.015% of B, 0.05% or less of Al, 4 to 8% in terms of TiO, 0.1 to 0.6% of in terms of SiO, 0.02 to 0.3% in terms of AlO, 0.1 to 0.8% of Mg, 0.05 to 0.3% in terms of F, 0.05 to 0.3% in terms of Na and K in a fluorine compound, 0.05 to 0.2% of NaO and KO, and 0.2% or less in terms of ZrO.

Flux-cored wire for carbon dioxide gas shielded arc welding

A wire including, in terms of % by mass with respect to a total mass of the wire, as a total in a steel outer skin and a flux, 0.03 to 0.08% of C, 0.1 to 0.6% of Si, 1.2 to 2.5% of Mn, 0.01 to 0.5% of Cu, 0.5 to 1.5% of Ni, 0.05 to 0.5% of Ti, 0.002 to 0.015% of B, and 0.05% or less of Al, and further including, in the flux, 4 to 8% in terms of TiO, 0.1 to 0.6% of in terms of SiO, 0.02 to 0.3% in terms of AlO, 0.1 to 0.8% of Mg, 0.05 to 0.3% in terms of F, 0.05 to 0.3% in terms of Na and K in a fluorine compound, 0.05 to 0.2% of NaO and KO, and 0.2% or less in terms of ZrO.

[object Object]

In a flux-cored wire according to the present invention, CaFand the like are included and a total amount thereof &#x3b1; is 3.3 to 6.0% in terms of mass % with respect to a total mass, Ti oxide and the like are included and a total amount thereof &#x3b2; is 0.4 to 1.2% in terms of mass % with respect to the total mass, CaCOand the like are included and a total amount thereof is 0.1 to 0.5% in terms of mass % with respect to the total mass, and an amount of an iron powder in the flux is less than 10% in terms of mass % with respect to the total mass.

Flux-cored wire, welding method using flux-cored wire, method for manufacturing weld joint using flux-cored wire, and weld joint

In a flux-cored wire for welding an ultrahigh tensile strength steel, one or more of CaF2, BaF2, SrF2, and MgF2 are included in the wire and, when a total amount thereof is defined as &#x3b1;, the &#x3b1; is more than 2.0% and equal to or less than 8.0% in terms of mass % with respect to a total mass of the wire, one or more of Ti oxide, Si oxide, Mg oxide, and Al oxide are included in the wire and, when a total amount thereof is defined as &#x3b2;, the &#x3b2; is 0.01% to 1.20% in terms of mass % with respect to the total mass of the wire, a ratio of an amount of the CaF2 with respect to the &#x3b1; is 0.50 or more, a ratio of the &#x3b1; with respect to the &#x3b2; is 2.0 to 800.0, and Ceq defined in the following expression is 0.60% to 1.20%, Ceq=[C]+[Si]/24+[Mn]/6+[Ni]/40+[Cr]/5+[Mo]/4+[V]/14.

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Tokyo, Japan

Yasuhito Totsuka