# US 11,299,792 B2 · Non-oriented electrical steel sheet and manufacturing method therefor

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- Number: US 11,299,792 B2
- Document ID: US11299792B2
- Status: Granted
- Kind: B2
- Application number: 15/539,629
- Filed: 2015-12-21
- Published: 2017-12-21
- Granted: 2022-04-12
- Earliest claimed: 2014-12-24
- Assignees: Posco
- Applicants: Posco
- Inventors: Jae-Hoon Kim; Jong Uk Ryu; Seung Il Kim; Sin Young Jung; Su Yong Sin; Sang Woo Lee
- Web page: https://patentgrep.com/patent/US11299792B2

## CPC

- C21D 9/46: for sheet metals
- C21D 6/008: {containing Si}
- C21D 8/1216: characterised by the working steps
- C21D 8/1222: {Hot rolling}
- C21D 8/1233: {Cold rolling}
- C21D 8/125: {with application of tension}
- C21D 8/1261: {following hot rolling}
- 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
- C22C 38/12: containing tungsten, tantalum, molybdenum, vanadium, or niobium
- C22C 38/14: containing titanium or zirconium
- C22C 38/60: containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
- C21D 8/1272: {Final recrystallisation annealing}
- 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)
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A non-oriented electrical steel sheet according to an embodiment of the present invention includes Ti at 0.0030 wt % or less (excluding 0 wt %), Nb at 0.0035 wt % or less (excluding 0 wt %), V at 0.0040 wt % or less (excluding 0 wt %), B at 0.0003 wt % to 0.0020 wt %, and the remaining portion including Fe and other inevitably added impurities, wherein a value of ([Ti]+0.8[Nb]+0.5[V])/(10*[B]) may be 0.17 to 7.8.

## Claims

### Claim 1

A non-oriented electrical steel sheet comprising,
based on 100 wt % of a total composition thereof, Ti at 0.0015 wt % or more to 0.0030 wt % or less, Nb at 0.0005 wt % or more to 0.0035 wt % or less, Vat 0.0015 wt % or more to 0.0040 wt % or less, B at 0.0003 wt % to 0.0020 wt %, and the remaining portion including Fe and impurities,
wherein a value of ([Ti]+0.8[Nb]+0.5[V])/(10*[B]) is 0.4 to 7.8,
wherein when a rolling direction of the electrical steel sheet corresponds to an x-axis, a width direction thereof corresponds to a y-axis, and a direction normal to an xy plane thereof corresponds to a z-axis, a value of (length of the grain in the y-axis direction)/(length of the grain in the z-axis direction) measured on a yz plane is 1.18 or more to 1.5 or less, and
wherein the electrical steel sheet, based on 100 wt % of a total composition thereof, further includes P at 0.005 wt % to 0.08 wt %, Sn at 0.01 wt % to 0.08 wt %, Sb at 0.005 wt % to 0.05 wt %, or a combination thereof, and [P]+[Sn]+[Sb] is 0.01 wt % to 0.1 wt %.

### Claim 2 (depends on 1)

The non-oriented electrical steel sheet of claim 1, wherein a grain size of the electrical steel sheet is 60 μm to 95 μm.

### Claim 3 (depends on 1)

The non-oriented electrical steel sheet of claim 1, wherein the electrical steel sheet, based on 100 wt % of a total composition thereof, further includes C at greater than 0 to 0.004 wt % or less, Si at 2.5 wt % to 3.5 wt %, Al at 0.5 wt % to 1.8 wt %, Mn at 0.05 wt % to 0.9 wt %, N at greater than 0 to 0.0030 wt % or less, and S at greater than 0 to 0.0030 wt % or less.

### Claim 4 (depends on 1)

The non-oriented electrical steel sheet of claim 1,
wherein in the electrical steel sheet, the number of inclusions including Ti, Nb, V, and B is 500/mm2 or less,
wherein the measurement of the number of inclusions is performed by a transmission electron microscope (TEM), and the number of measured inclusions is analyzed by EDS.