Non-oriented electrical steel strip for electric motors

Patent metadata

Field	Value
Publication number	US-11041222-B2
Application number	US-201816609636-A
Country	US
Kind code	B2
Filing date	May 11, 2018
Priority date	May 15, 2017
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

The invention relates to a non-oriented electrical steel strip or sheet, in particular for electrical engineering applications, an electrical engineering component produced from such an electrical steel strip or sheet, a process for producing an electrical steel strip or sheet and the use of such an electrical steel strip or sheet in components for electrical engineering applications.

First claim

The invention claimed is:

1. A non-oriented electrical steel strip or sheet, wherein a ratio of a polarization at a field strength of 100 A/m J 100 to a polarization at a field strength of 2500 A/m J 2500 , in each case measured at 50 Hz, is at least 0.5, wherein the electrical steel strip or sheet has a thickness of not more than 0.35 mm and a specific electrical resistance is from 0.40 to 0.70 μΩm at a temperature of 50° C.

2. The non-oriented electrical steel strip or sheet as claimed in claim 1 , wherein the non-oriented electrical steel strip or sheet is produced from a steel containing
Si: from 2.30 to 3.40% by weight,
Al: from 0.30 to 1.10% by weight,
Mn: from 0.07 to 0.25% by weight,
P: up to 0.030% by weight,
in addition to iron and unavoidable impurities.

3. The non-oriented electrical steel strip or sheet as claimed in claim 1 wherein the non-oriented electrical steel strip or sheet has a grain size of from 50 to 130 μm, preferably from 70 to 100 μm.

4. The non-oriented electrical steel strip or sheet as claimed in claim 2 wherein the non-oriented electrical steel strip or sheet has mixed values of P 1.5/50 =2.1-2.9 W/kg, P 1.0/400 <16 W/kg and P 1.0/2000 <210 W/kg.

5. The non-oriented electrical steel strip or sheet as claimed in claim 1 wherein the specific electrical resistance is from 0.52 to 0.67 μΩm.

6. The non-oriented electrical steel strip or sheet as claimed in claim 1 wherein the ratio of the polarization at a field strength of 100 Nm J 100 to the polarization at a field strength of 200 Nm J 200 , in each case measured at 50 Hz, is from at least 0.59 to 1.0.

7. The non-oriented electrical steel strip or sheet as claimed in claim 1 wherein the non-oriented electrical steel strip or sheet has a thickness of from 0.24 to 0.33 mm.

8. The non-oriented electrical steel strip or sheet as claimed in claim 1 wherein a yield strength Rp0.2 is from 330 to 480 N/mm 2 .

9. The non-oriented electrical steel strip or sheet as claimed in claim 1 wherein a tensile strength Rm is from 450 to 600 N/mm 2 .

10. The non-oriented electrical steel strip or sheet as claimed in claim 1 wherein an elongation at a break A80 has a value of from 10 to 30.

11. The non-oriented electrical steel strip or sheet as claimed in claim 1 wherein a hardness Hv5 has a value of from 140 to 240.

12. The non-oriented electrical steel strip or sheet as claimed in claim 1 wherein the non-oriented electrical steel strip or sheet is cold-rolled from a hot-rolled strip resulting in a decrease in thickness of between 83.1% and 86.7%.

13. The non-oriented electrical steel strip or sheet as claimed in claim 1 wherein the non-oriented electrical steel strip or sheet is produced from a steel containing
Si: from 3.00% to 3.40% by weight.

14. The non-oriented electrical steel strip or sheet as claimed in claim 1 wherein the non-oriented electrical steel strip or sheet is produced from a steel containing
Al: from 0.30% to less than 1.00% by weight.

15. The non-oriented electrical steel strip or sheet as claimed in claim 14 wherein the non-oriented electrical steel strip or sheet is produced from a steel containing
Al: from 0.302% to 0.95% by weight.

16. A process for producing the non-oriented electrical steel strip or sheet as claimed in claim 1 , consisting the following process steps:
provision of a hot-rolled strip which consists of a steel containing
Si: from 2.30 to 3.40% by weight,
Al: from 0.43 to 1.10% by weight,
Mn: from 0.07 to 0.250% by weight,
P: up to 0.030% by weight,

in addition to iron and unavoidable impurities,
cold rolling of the hot-rolled strip to give a cold-rolled strip, and
final heat treatment of the cold-rolled strip,

wherein the final heat treatment is carried out at a temperature of from 950 to 1100° C. for at least 10 seconds and not more than 90 seconds, thereby producing the non-oriented electrical steel strip or sheet of claim 1 .

17. The process of claim 16 wherein the non-oriented electrical steel strip or sheet is produced from a steel containing
Si: from 3.00% to 3.40% by weight.

18. The process of claim 16 wherein the non-oriented electrical steel strip or sheet is produced from a steel containing
Al: from 0.30% to less than 1.00% by weight.

19. The process of claim 16 wherein the non-oriented electrical steel strip or sheet is produced from a steel containing
Al: from 0.302% to 0.95% by weight.

Assignees

• Thyssenkrupp Steel Europe Ag
• Thyssenkrupp Ag

Inventors

• Fischer Olaf
• Sieron Sebastian
• Strauss Silke
• Telger Karl
• Tietz Marco
• Vidovic Anton

Classifications

• C22C38/06

  containing aluminium · CPC title

• C22C38/04

  containing manganese · CPC title

• C22C38/02 Primary

  containing silicon · CPC title

• C21D8/1244

  characterised by the heat treatment · CPC title

• C21D8/1233

  Cold rolling · CPC title