# US 10,870,178 B2 · Flux-cored wire for arc welding of duplex stainless steel and weld metal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,178 B2 - Document ID: US10870178B2 - Status: Granted - Kind: B2 - Application number: 15/398,357 - Filed: 2017-01-04 - Published: 2017-08-24 - Granted: 2020-12-22 - Earliest claimed: 2016-02-22 - Assignees: Kobe Steel, Ltd. - Applicants: Kobe Steel, Ltd. - Inventors: Masatoshi Ishida; Hiroshi Sugahara; Tetsunao Ikeda; Shigeki Nishiyama - Web page: https://patentgrep.com/patent/US10870178B2 ## CPC - B23K 35/0266: {flux-cored} - B23K 9/00: Arc welding or cutting - B23K 35/308: {with Cr as next major constituent} - B23K 35/3086: {containing Ni or Mn} - B23K 35/3602: {Carbonates, basic oxides or hydroxides} - B23K 35/3605: {Fluorides} - B23K 35/3607: {Silica or silicates} - B23K 35/3608: {Titania or titanates} - B23K 35/362: Selection of compositions of fluxes (B23K35/365, B23K35/368 take precedence) - B23K 35/368: Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials - C22C 38/001: {containing N} - C22C 38/02: containing silicon - C22C 38/04: containing manganese - C22C 38/06: containing aluminium - C22C 38/42: with copper - C22C 38/44: with molybdenum or tungsten - C22C 38/50: with titanium or zirconium - C22C 38/58: with more than 1.5% by weight of manganese - 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 - C22C: ALLOYS (treatment of alloys C21D, C22F) ## Abstract A flux-cored wire for arc welding of a duplex stainless steel includes a stainless-steel sheath filled with a flux and contains, with respect to the total mass of the wire, predetermined amounts of Cr, Ni, Mo, N, Mn, and Si, in which letting a Ti alloy content in terms of Ti be [Ti] and letting an Al alloy content in terms of Al be [Al], [Ti] and [Al] are predetermined values, and in which parameter A expressed as A=[Ti]+2×[Al] satisfies a predetermined value, and the balance is composed of Fe, a slag-forming component, and incidental impurities. ## Claims ### Claim 1 A flux-cored wire, comprising, with respect to a total mass of the wire: 21.0% to 27.0% by mass Cr; 7.0% to 11.0% by mass Ni; 2.0% to 4.0% by mass Mo; 0.08% to 0.25% by mass N; 0.1% to 2.5% by mass Mn; 0.1% to 1.0% by mass Si; 0.3% to 0.8% by mass of a Ti alloy in terms of Ti, a Ti alloy content in terms of Ti being expressed as [Ti]; 0.07% to 0.35% by mass of an Al alloy in terms of Al, an Al alloy content in terms of Al being expressed as [Al]; and the balance being Fe, a slag-forming component, and incidental impurities, wherein parameter A expressed as A=[Ti]+2×[Al] satisfies 0.6 to 1.20. ### Claim 2 (depends on 1) The flux-cored wire according to claim 1, comprising: 8% to 13% by mass of the slag-forming component. ### Claim 3 (depends on 2) The flux-cored wire according to claim 2, wherein the [Ti] is 0.3% to 0.7% by mass, and the [Al] is 0.07% to 0.30% by mass, wherein the parameter A is 0.7 to 1.20. ### Claim 4 (depends on 3) The flux-cored wire according to claim 3, comprising: a metal oxide; and a metal fluoride, each of the metal oxide and the metal fluoride serving as the slag-forming component, wherein the metal oxide comprises: 5.0% to 9.0% by mass TiO2; 0.1% to 2.0% by mass SiO2; and 0.5% to 3.0% by mass ZrO2, and wherein [F] is 0.01% to 0.5% by mass, where [F] represents a metal fluoride content in terms of fluorine, with respect to the total mass of the wire. ### Claim 5 (depends on 4) The flux-cored wire according to claim 4, comprising: a Li-containing alkali metal compound serving as the slag-forming component, wherein [Li] is 0.01% to 0.15% by mass, where [Li] represents the alkali metal compound content in terms of Li, with respect to the total mass of the wire. ### Claim 6 (depends on 2) The flux-cored wire according to claim 2, comprising: a metal oxide; and a metal fluoride, each of the metal oxide and the metal fluoride serving as the slag-forming component, wherein the metal oxide comprises: 5.0% to 9.0% by mass TiO2; 0.1% to 2.0% by mass SiO2; and 0.5% to 3.0% by mass ZrO2, and wherein [F] is 0.01% to 0.5% by mass, where [F] represents a metal fluoride content in terms of fluorine, with respect to the total mass of the wire. ### Claim 7 (depends on 6) The flux-cored wire according to claim 6, comprising: a Li-containing alkali metal compound serving as the slag-forming component, wherein [Li] is 0.01% to 0.15% by mass, where [Li] represents the alkali metal compound content in terms of Li, with respect to the total mass of the wire. ### Claim 8 (depends on 2) The flux-cored wire according to claim 2, comprising: a Li-containing alkali metal compound serving as the slag-forming component, wherein [Li] is 0.01% to 0.15% by mass, where [Li] represents the alkali metal compound content in terms of Li, with respect to the total mass of the wire. ### Claim 9 (depends on 3) The flux-cored wire according to claim 3, comprising: a Li-containing alkali metal compound serving as the slag-forming component, wherein [Li] is 0.01% to 0.15% by mass, where [Li] represents the alkali metal compound content in terms of Li, with respect to the total mass of the wire. ### Claim 10 (depends on 1) The flux-cored wire according to claim 1, wherein the [Ti] is 0.3% to 0.7% by mass, and the [Al] is 0.07% to 0.30% by mass, wherein the parameter A is 0.7 to 1.20. ### Claim 11 (depends on 10) The flux-cored wire according to claim 10, comprising: a metal oxide; and a metal fluoride, each of the metal oxide and the metal fluoride serving as the slag-forming component, wherein the metal oxide comprises: 5.0% to 9.0% by mass TiO2; 0.1% to 2.0% by mass SiO2; and 0.5% to 3.0% by mass ZrO2, and wherein [F] is 0.01% to 0.5% by mass, where [F] represents a metal fluoride content in terms of fluorine, with respect to the total mass of the wire. ### Claim 12 (depends on 11) The flux-cored wire according to claim 11, comprising: a Li-containing alkali metal compound serving as the slag-forming component, wherein [Li] is 0.01% to 0.15% by mass, where [Li] represents the alkali metal compound content in terms of Li, with respect to the total mass of the wire. ### Claim 13 (depends on 10) The flux-cored wire according to claim 10, comprising: a Li-containing alkali metal compound serving as the slag-forming component, wherein [Li] is 0.01% to 0.15% by mass, where [Li] represents the alkali metal compound content in terms of Li, with respect to the total mass of the wire. ### Claim 14 (depends on 1) The flux-cored wire according to claim 1, comprising: a metal oxide; and a metal fluoride, each of the metal oxide and the metal fluoride serving as the slag-forming component, wherein the metal oxide comprises: 5.0% to 9.0% by mass TiO2; 0.1% to 2.0% by mass SiO2; and 0.5% to 3.0% by mass ZrO2, and wherein [F] is 0.01% to 0.5% by mass, where [F] represents a metal fluoride content in terms of fluorine, with respect to the total mass of the wire. ### Claim 15 (depends on 14) The flux-cored wire according to claim 14, comprising: a Li-containing alkali metal compound serving as the slag-forming component, wherein [Li] is 0.01% to 0.15% by mass, where [Li] represents the alkali metal compound content in terms of Li, with respect to the total mass of the wire. ### Claim 16 (depends on 1) The flux-cored wire according to claim 1, comprising: a Li-containing alkali metal compound serving as the slag-forming component, wherein [Li] is 0.01% to 0.15% by mass, where [Li] represents the alkali metal compound content in terms of Li, with respect to the total mass of the wire. ### Claim 17 (depends on 1) A weld metal produced by welding with the flux-cored wire according to claim 1. ### Claim 18 (depends on 2) A weld metal produced by welding with the flux-cored wire according to claim 2. ### Claim 19 (depends on 10) A weld metal produced by welding with the flux-cored wire according to claim 10.