# US 2014/0150249 A1 · Cold rolled motor lamination electrical steels with reduced aging and improved electrical properties

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- Number: US 2014/0150249 A1
- Document ID: US20140150249A1
- Status: Published application
- Kind: A1
- Application number: 13/692,013
- Filed: 2012-12-03
- Published: 2014-06-05
- Earliest claimed: 2012-12-03
- Inventors: Gwynne Johnston
- Web page: https://patentgrep.com/patent/US20140150249A1

## CPC

- H01F 41/0206: {Manufacturing of magnetic cores by mechanical means (magnetic cores per se H01F27/24)}
- C21D 8/1233: {Cold rolling}
- C21D 8/1272: {Final recrystallisation annealing}
- C22C 38/008: {containing tin}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/06: containing aluminium
- C22C 38/60: containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
- H01F 1/14791: {Fe-Si-Al based alloys, e.g. Sendust}
- H01F 41/0233: {Manufacturing of magnetic circuits made from sheets (magnetic cores made from sheets H01F27/245; soft magnetic alloys in the form of sheets H01F1/16)}
- C21D 8/1255: {with diffusion of elements, e.g. decarburising, nitriding}
- Y10T 29/4902: Electromagnet, transformer or inductor
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A semi-processed electrical steel is provided comprising the elements .005 ≦ Tin ≦ .09% 0 < Carbon ≦ 0.050% .10 ≦ Manganese ≦ 1.00% .005 ≦ Phosphorus ≦ .120% .0 < Sulfur ≦ .010% .50 ≦ Silicon ≦ 2.50% .01 ≦ Aluminum ≦ 1.60% .0 ≦ Antimony < .02% Iron—at least substantial portion of balance

## Claims

### Claim 1

A semi-processed cold rolled lamination electrical steel, comprising:
.005 ≦
Tin ≦
.09%
.0 <
Carbon ≦
0.050%
.10 ≦
Manganese ≦
1.00%
.005 ≦
Phosphorus ≦
.120%
.0 <
Sulfur ≦
.010%
.50 ≦
Silicon ≦
2.50%
.01 ≦
Aluminum ≦
1.60%
.0 ≦
Antimony <
.02%
Iron—at least substantial portion of balance

### Claim 2 (depends on 1)

The semi-processed electrical steel of claim 1 wherein antimony is <0.01%.

### Claim 3 (depends on 1)

The semi-processed electrical steel of claim 1 wherein antimony is <0.005%.

### Claim 4 (depends on 1)

The semi-processed electrical steel of claim 1 wherein antimony is 0%.

### Claim 5 (depends on 1)

The semi-processed electrical steel of claim 1 further comprising at least one of the elements selected from the group consisting of copper, nickel, chromium, and molybdenum.

### Claim 6 (depends on 1)

The semi-processed electrical steel of claim 1 wherein said semi-processed electrical steel requires an annealing after stamping.

### Claim 7 (depends on 1)

The semi-processed electrical steel of claim 1 wherein the carbon is in a range from 0.005 to 0.050%.

### Claim 8

A method for producing a magnetic core, comprising the steps of:
providing a semi-processed cold rolled electrical steel comprising
.005 ≦
Tin ≦
.09%
.0 <
Carbon ≦
0.050%
.10 ≦
Manganese ≦
1.00%
.005 ≦
Phosphorus ≦
.120%
.0 <
Sulfur ≦
.010%
.50 ≦
Silicon ≦
2.50%
.01 ≦
Aluminum ≦
1.60%
.0 ≦
Antimony <
.02%
Iron—at least substantial portion of balance;
stamping the semi-processed electrical steel to create stamped parts; and
assembling and annealing the stamped parts after the stamping to form the magnetic core.

### Claim 9 (depends on 8)

The method of claim 8 wherein at least one of the elements selected from the group consisting of copper, nickel, chromium, and molybdenum is additionally present in the electrical steel.

### Claim 10 (depends on 8)

The method of claim 8 wherein the stamped parts are annealed before the parts are assembled to form the core.

### Claim 11 (depends on 9)

The method of claim 9 wherein the stamped parts are annealed after the stamped parts are assembled to form the core.