# US 2021/0340651 A1 · Non-oriented electrical steel sheet and manufacturing method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0340651 A1 - Document ID: US20210340651A1 - Status: Published application - Kind: A1 - Application number: 17/280,482 - Filed: 2019-09-25 - Published: 2021-11-04 - Earliest claimed: 2018-09-27 - Assignees: Posco - Applicants: Posco - Inventors: Seil LEE - Web page: https://patentgrep.com/patent/US20210340651A1 ## CPC - C22C 38/14: containing titanium or zirconium - C21D 6/00: Heat treatment of ferrous alloys - C21D 6/005: {containing Mn} - C21D 6/008: {containing Si} - C21D 8/0226: {Hot rolling} - C21D 8/0236: {Cold rolling} - C21D 8/12: during manufacturing of articles with special electromagnetic properties - C21D 8/1222: {Hot rolling} - C21D 8/1233: {Cold rolling} - C21D 8/1261: {following hot rolling} - C21D 8/1272: {Final recrystallisation annealing} - C21D 9/46: for sheet metals - C22C 38/00: Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) - C22C 38/001: {containing N} - C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60} - C22C 38/004: {Very low carbon steels, i.e. having a carbon content of less than 0,01%} - C22C 38/008: {containing tin} - C22C 38/02: containing silicon - C22C 38/04: containing manganese - C22C 38/06: containing aluminium - H01F 1/147: Alloys characterised by their composition {(treatment thereof for enhancing their electromagnetic properties C21D8/12)} - C22C: ALLOYS (treatment of alloys C21D, C22F) - C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A non-oriented electrical steel sheet according to an embodiment of the present invention includes: Si at 1.5 to 4.0 wt %, Al at 0.001 to 0.011 wt %, Mn at 0.05 to 0.40 wt %, S at 0.0001 to 0.01 wt %, As at 0.003 to 0.015 wt %, Mg at 0.0007 to 0.003 wt %, and the balance including Fe and other impurities unavoidably added thereto. ## Claims ### Claim 1 A non-oriented electrical steel sheet, comprising: Si at 1.5 to 4.0 wt %, Al at 0.001 to 0.011 wt %, Mn at 0.05 to 0.40 wt %, S at 0.0001 to 0.01 wt %, As at 0.003 to 0.015 wt %, Mg at 0.0007 to 0.003 wt %, and the balance including Fe and other impurities unavoidably added thereto. ### Claim 2 (depends on 1) The non-oriented electrical steel sheet of claim 1, wherein As is contained in an amount of 0.0034 to 0.01 wt %. ### Claim 3 (depends on 1) The non-oriented electrical steel sheet of claim 1, wherein Mg is contained in an amount of 0.0009 to 0.002 wt %. ### Claim 4 (depends on 1) The non-oriented electrical steel sheet of claim 1, wherein the non-oriented electrical steel sheet satisfies Formula 1: [As]>[Al] [Formula 1] (in Formula 1, [As] and [Al] are contents (wt %) of As and Al, respectively.) ### Claim 5 (depends on 1) The non-oriented electrical steel sheet of claim 1, wherein the non-oriented electrical steel sheet satisfies Formula 2: 3×[Mg]>[Al] [Formula 2] (in Formula 2, [Mg] and [Al] are contents (wt %) of Mg and Al, respectively.) ### Claim 6 (depends on 1) The non-oriented electrical steel sheet of claim 1, further comprising Sn at 0.02 to 0.09 wt % and P at 0.01 to 0.15 wt %. ### Claim 7 (depends on 6) The non-oriented electrical steel sheet of claim 6, wherein the non-oriented electrical steel sheet satisfies Formula 3: 0.03≤[Sn]+[P]≤0.15 [Formula 3] (in Formula 3, [Sn] and [P] are contents (wt %) of Sn and P, respectively.) ### Claim 8 (depends on 1) The non-oriented electrical steel sheet of claim 1, further comprising C at 0.004 wt % or less, N at 0.003 wt % or less, and Ti at 0.003 wt % or less. ### Claim 9 (depends on 1) The non-oriented electrical steel sheet of claim 1, wherein one or more of Cu, Ni, and Cr are further contained in an amount of 0.05 wt % or less, respectively. ### Claim 10 (depends on 1) The non-oriented electrical steel sheet of claim 1, wherein one or more of Zr, Mo, and V are further contained in an amount of 0.01 wt % or less, respectively. ### Claim 11 (depends on 1) The non-oriented electrical steel sheet of claim 1, wherein a precipitate of As is included at a size of 0.0001 to 0.003 area %. ### Claim 12 (depends on 1) The non-oriented electrical steel sheet of claim 1, wherein an average particle diameter of the precipitate of As is 3 to 100 nm. ### Claim 13 (depends on 1) The non-oriented electrical steel sheet of claim 1, wherein a precipitate of MgS is included at a size of 0.0002 to 0.005 area %. ### Claim 14 (depends on 1) The non-oriented electrical steel sheet of claim 1, wherein an average particle diameter of the precipitate of MgS is 3 to 30 nm. ### Claim 15 (depends on 1) The non-oriented electrical steel sheet of claim 1, wherein an average grain size is 60 to 300 μm. ### Claim 16 A manufacturing method of a non-oriented electrical steel sheet, comprising: heating a slab containing Si at 1.5 to 4.0 wt %, Al at 0.001 to 0.011 wt %, Mn at 0.05 to 0.40 wt %, S at 0.0001 to 0.01 wt %, As at 0.003 to 0.015 wt %, Mg at 0.0007 to 0.003 wt %, and the balance including Fe and other impurities unavoidably added thereto; hot-rolling the slab to manufacture a hot-rolled sheet; cold-rolling the hot-rolled sheet to manufacture a cold-rolled sheet; and final annealing the cold-rolled sheet. ### Claim 17 (depends on 16) The manufacturing method of the non-oriented electrical steel sheet of claim 16, wherein the slab is heated at 1100° C. to 1250° C. ### Claim 18 (depends on 16) The manufacturing method of the non-oriented electrical steel sheet of claim 16, further comprising after the manufacturing of the hot-rolled sheet, annealing the hot-rolled sheet at a temperature of 950 to 1200° C. ### Claim 19 (depends on 16) The manufacturing method of the non-oriented electrical steel sheet of claim 16, wherein in the final annealing, the cold-rolled sheet is annealed at 950 to 1150° C.