# US 12,110,569 B2 · Non oriented electrical steel sheet and method for producing thereof

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- Number: US 12,110,569 B2
- Document ID: US12110569B2
- Status: Granted
- Kind: B2
- Application number: 17/437,726
- Filed: 2019-03-20
- Published: 2022-05-12
- Granted: 2024-10-08
- Earliest claimed: 2019-03-20
- Assignees: Nippon Steel Corporation
- Applicants: Nippon Steel Corporation
- Inventors: Takeru Ichie; Masaru Takahashi; Fuminobu Murakami; Shinichi Matsui; Masahiro Yamamoto
- Web page: https://patentgrep.com/patent/US12110569B2

## CPC

- C21D 9/46: for sheet metals
- C22C 38/004: {Very low carbon steels, i.e. having a carbon content of less than 0,01%}
- C21D 1/19: by interrupted quenching
- C21D 6/005: {containing Mn}
- C21D 6/008: {containing Si}
- C21D 8/00: Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment (hardening articles or materials formed by forging or rolling with no further heating beyond that required for the formation C21D1/02)
- C21D 8/1222: {Hot rolling}
- C21D 8/1233: {Cold rolling}
- C21D 8/1261: {following hot rolling}
- C21D 8/1272: {Final recrystallisation annealing}
- 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 38/005: {containing rare earths, i.e. Sc, Y, Lanthanides}
- C22C 38/008: {containing tin}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/06: containing aluminium
- C22C 38/16: containing copper
- C22C 38/60: containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
- H01F 1/14775: {in the form of sheets}
- H01F 1/14791: {Fe-Si-Al based alloys, e.g. Sendust}
- H01F 1/18: with insulating coating
- H01F 41/02: for manufacturing cores, coils, or magnets (H01F41/14 takes precedence; for dynamo-electric machines H02K15/00)
- C21D 2201/05: Grain orientation
- C22C 2202/02: Magnetic
- C23G 1/00: Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G5/02)
- C23G 1/081: {solutions containing H2SO4}
- C23G 1/085: {solutions containing HNO3}
- C23G 1/19: Iron or steel
- 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)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- C23G: CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS

## Abstract

A non oriented electrical steel sheet consists of a silicon steel sheet and an insulation coating. The silicon steel sheet contains Si, Al, and Mn as chemical composition, and an alignment degree to {5 5 7}<7 14 5> orientation in a central area along a thickness direction of the silicon steel sheet is 12 to 35.

## Claims

### Claim 1

A non oriented electrical steel sheet comprising a silicon steel sheet and an insulation coating, characterized in that
the silicon steel sheet contains, as a chemical composition, by mass %,
0.01 to 3.50% of Si,
0.001 to 2.500% of Al,
0.01 to 3.00% of Mn,
0.0030% or less of C,
0.180% or less of P,
0.003% or less of S,
0.003% or less of N,
0.002% or less of B,
0 to 0.05% of Sb,
0 to 0.20% of Sn,
0 to 1.00% of Cu,
0 to 0.0400% of rare earth metal (REM),
0 to 0.0400% of Ca,
0 to 0.0400% of Mg, and
a balance consisting of Fe and impurities, and
an alignment degree to {5 5 7}<7 14 5> orientation in a central area along a thickness direction of the silicon steel sheet is 12 to 35.

### Claim 2 (depends on 1)

The non oriented electrical steel sheet according to claim 1,
wherein the silicon steel sheet contains, as the chemical composition, by mass %, at least one of
0.001 to 0.05% of Sb,
0.01 to 0.20% of Sn,
0.10 to 1.00% of Cu,
0.0005 to 0.0400% of rare earth metal (REM),
0.0005 to 0.0400% of Ca, and
0.0005 to 0.0400% of Mg.

### Claim 3 (depends on 1)

The non oriented electrical steel sheet according to claim 1,
wherein the alignment degree to {5 5 7}<7 14 5> orientation is 18 to 35.

### Claim 4 (depends on 1)

A method for producing the non oriented electrical steel sheet according to claim 1, the method comprising a casting process, a hot rolling process, an heat conservation process, a pickling process, a cold rolling process, a final annealing process, and a coating formation process, wherein
in the casting process, a slab is cast, the slab including, as a chemical composition, by mass %,
0.01 to 3.50% of Si,
0.001 to 2.500% of Al,
0.01 to 3.00% of Mn,
0.0030% or less of C,
0.180% or less of P,
0.003% or less of S,
0.003% or less of N,
0.002% or less of B,
0 to 0.05% of Sb,
0 to 0.20% of Sn,
0 to 1.00% of Cu,
0 to 0.0400% of rare earth metal (REM),
0 to 0.0400% of Ca,
0 to 0.0400% of Mg, and
a balance consisting of Fe and impurities,
in the hot rolling process, a slab heating temperature before hot rolling is 1000 to 1300° C., a finish rolling temperature for final hot rolling is 800 to 950° C., a cumulative reduction of hot rolling is 98 to 99.5%, and an average cooling rate from a temperature after finishing the hot rolling to a heat conservation temperature for heat conservation treatment is 80 to 200° C./second,
in the heat conservation process, the heat conservation temperature is 700 to 850° C. and a heat conservation time is 10 to 180 minutes,
a fraction of non-recrystallized grains in a steel sheet before the cold rolling process is controlled to be 10 to 20 area %,
in the cold rolling process, a cumulative reduction of cold rolling is 80 to 95%, and
in the final annealing process, an average heating rate from a heating start temperature to 750° C. is 5 to 50° C./second, an average heating rate from 750° C. to a holding temperature for final annealing is changed to a heating rate which is faster than the average heating rate to 750° C. and which is within a range of 20 to 100° C./second, and the holding temperature for final annealing is a recrystallization temperature or higher.

### Claim 5

A non oriented electrical steel sheet comprising a silicon steel sheet and an insulation coating, characterized in that
the silicon steel sheet contains, as a chemical composition, by mass %,
0.01 to 3.50% of Si,
0.001 to 2.500% of Al,
0.01 to 3.00% of Mn,
0.0030% or less of C,
0.180% or less of P,
0.003% or less of S,
0.003% or less of N,
0.002% or less of B,
0 to 0.05% of Sb,
0 to 0.20% of Sn,
0 to 1.00% of Cu,
0 to 0.0400% of rare earth metal (REM),
0 to 0.0400% of Ca,
0 to 0.0400% of Mg, and
a balance comprising Fe and impurities, and
an alignment degree to {5 5 7}<7 14 5> orientation in a central area along a thickness direction of the silicon steel sheet is 12 to 35.

### Claim 6 (depends on 1)

A method for producing the non oriented electrical steel sheet according to claim 1, the method comprising a casting process, a hot rolling process, an heat conservation process, a pickling process, a cold rolling process, a final annealing process, and a coating formation process, wherein
in the casting process, a slab is cast, the slab including, as a chemical composition, by mass %,
0.01 to 3.50% of Si,
0.001 to 2.500% of Al,
0.01 to 3.00% of Mn,
0.0030% or less of C,
0.180% or less of P,
0.003% or less of S,
0.003% or less of N,
0.002% or less of B,
0 to 0.05% of Sb,
0 to 0.20% of Sn,
0 to 1.00% of Cu,
0 to 0.0400% of rare earth metal (REM),
0 to 0.0400% of Ca,
0 to 0.0400% of Mg, and
a balance comprising Fe and impurities,
in the hot rolling process, a slab heating temperature before hot rolling is 1000 to 1300° C., a finish rolling temperature for final hot rolling is 800 to 950° C., a cumulative reduction of hot rolling is 98 to 99.5%, and an average cooling rate from a temperature after finishing the hot rolling to a heat conservation temperature for heat conservation treatment is 80 to 200° C./second,
in the heat conservation process, the heat conservation temperature is 700 to 850° C. and a heat conservation time is 10 to 180 minutes,
a fraction of non-recrystallized grains in a steel sheet before the cold rolling process is controlled to be 10 to 20 area %,
in the cold rolling process, a cumulative reduction of cold rolling is 80 to 95%, and
in the final annealing process, an average heating rate from a heating start temperature to 750° C. is 5 to 50° C./second, an average heating rate from 750° C. to a holding temperature for final annealing is changed to a heating rate which is faster than the average heating rate to 750° C. and which is within a range of 20 to 100° C./second, and the holding temperature for final annealing is a recrystallization temperature or higher.