Cu-containing non-oriented electrical steel sheet and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-12378623-B2
Application number	US-202017636776-A
Country	US
Kind code	B2
Filing date	Aug 26, 2020
Priority date	Aug 26, 2019
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

The present invention discloses a Cu-containing non-oriented electrical steel plate having high cleanliness, comprising the following chemical elements in percentage by mass: 0<C≤0.003%; Si: 0.1-2.0%; Mn: 0.1-0.55%; S: 0-0.004%; Cu: 0.003-0.2%; Al: 0.1-1.0%; and the balance being Fe and inevitable impurities. In addition, the present invention further discloses a continuous annealing process for the Cu-containing non-oriented electrical steel plate having high cleanliness. Moreover, the present invention further discloses a manufacturing method for Cu-containing non-oriented electrical steel plate having high cleanliness, including the steps of: smelting and casting; hot rolling; normalizing; cold rolling; performing the continuous annealing process; and applying an insulation coating to obtain a finished non-oriented electrical steel plate. The Cu-containing non-oriented electrical steel plate having high-cleanliness is high in cleanliness and excellent in magnetic performance.

First claim

The invention claimed is:

1. A Cu-containing non-oriented electrical steel plate, comprising the following chemical elements in percentage by mass:
0<C≤0.003%; Si: 0.1-2.0%; Mn: 0.1-0.55%; S: 0-0.004%; Cu: 0.003-0.2%; Al: 0.1-1.0%; and the balance being Fe and inevitable impurities;
wherein the Cu-containing non-oriented electrical steel plate has sulfide inclusions, and the sulfide inclusions are in the shape of sphere or spheroid, and the proportion of the sulfide inclusions having a size of 0.2-1.0 μm≥75%.

2. The Cu-containing non-oriented electrical steel plate of claim 1 , characterized in that, the content of the chemical elements in percentage by mass further satisfies: 60≤([Mn]+[Cu]/2)/[S]≤140.

3. The Cu-containing non-oriented electrical steel plate of claim 2 , characterized in that the sulfide inclusions comprise at least one of single MnS or Cu x S-coated MnS, and single Cu x S.

4. The Cu-containing non-oriented electrical steel plate of claim 1 , characterized in that, the inevitable impurities include: P≤0.2%, N≤0.003%, O≤0.003%.

5. The Cu-containing non-oriented electrical steel plate of claim 1 , characterized in that the sulfide inclusions comprise at least one of single MnS or Cu x S-coated MnS, and single Cu x S.

6. The Cu-containing non-oriented electrical steel plate of claim 5 , characterized in that, the quantity of the single Cu x S≤3.0×10 7 /mm 3 .

7. The Cu-containing non-oriented electrical steel plate of claim 1 , characterized in that, the Cu-containing non-oriented electrical steel plate has an iron loss P 15/50 of ≤4.1 W/kg and a magnetic induction B 50 of ≥1.72 T.

8. A continuous annealing process for the Cu-containing non-oriented electrical steel plate of claim 1 , comprising the steps of:
heating a cold-rolled steel plate from rapid heating initial temperature T initial to rapid heating final temperature T final ; T final =T initial +kv 1 , wherein v 1 represents a first heating rate ranging from 50-800° C./s; k is rapid heating aging factor ranging from 0.5-2.0/s; and
heating to soaking temperature T soaking at a second heating rate v 2 to perform soaking and heat preservation, wherein v 2 ≤30° C./s.

9. The continuous annealing process of claim 8 , characterized in that, the rapid heating initial temperature T initial is a temperature from room temperature to 550° C.

10. The continuous annealing process of claim 8 , characterized in that, the rapid heating final temperature T final ≤T soaking −(30-80).

11. The continuous annealing process of claim 8 , characterized in that, the range of the first heating rate v 1 is 100-600° C./s.

12. The continuous annealing process of claim 8 , characterized in that, an interval t switch between the heating process heating at the second heating rate v 2 and the heating process heating at the first heating rate v 1 is 1-5 s.

13. A manufacturing method of the Cu-containing non-oriented electrical steel plate, comprising the steps of:
smelting and casting;
hot rolling;
normalizing;
cold rolling;
performing the continuous annealing process of claim 8 ; and
applying an insulation coating to obtain the finished Cu-containing non-oriented electrical steel plate of claim 1 .

14. The manufacturing method of claim 13 , characterized in that, temperature control operation is performed on the steel plate after the casting step, so that a surface temperature T charging before entering a hot-rolling heating furnace is ≤600° C.

15. The manufacturing method of claim 14 , characterized in that, temperature control operation is performed on the steel plate after the casting step, so that the surface temperature T charging before entering the hot-rolling heating furnace is ≤300° C.

Assignees

• Baoshan Iron & Steel

Inventors

• Zhang Feng
• Wang Bo
• Shen Kanyi
• Liu Baojun
• Li Guobao
• Chu Shuangjie

Classifications

• H01F1/14791

  Fe-Si-Al based alloys, e.g. Sendust · CPC title

• C22C38/16

  containing copper · CPC title

• C22C38/06

  containing aluminium · CPC title

• C22C38/04

  containing manganese · CPC title

• C22C38/02

  containing silicon · CPC title