Non-oriented electrical steel having excellent magnetic properties

Patent metadata

Field	Value
Publication number	US-11162154-B2
Application number	US-201716343216-A
Country	US
Kind code	B2
Filing date	Oct 26, 2017
Priority date	Oct 28, 2016
Publication date	Nov 2, 2021
Grant date	Nov 2, 2021

Abstract

A non-oriented electrical steel having excellent magnetic properties, the chemical elements thereof in percentage by mass being: Si: 0.2-1.5%, Mn: 0.01-0.30%, Al: 0.001-0.009%, O: 0.005-0.02%, C≤0.005%, S≤0.005%, N≤0.005%, and Ti≤0.002%, the remainder being Fe and other unavoidable impurities, and Al/Si≤0.006 and Mn/Si≤0.2. The method for producing comprises the following sequence of steps: (1) smelting; (2) hot rolling: the slab heating temperature being 850° C. to 1250° C., and the final rolling temperature being 800-1050° C.; (3) acid pickling; (4) cold rolling; (5) annealing: the annealing plate temperature being controlled between 620° C.-900° C.; and (6) coating.

First claim

The invention claimed is:

1. A non-oriented electrical steel comprising the following chemical elements in mass percentage:
Si: 1.2˜1.5%, Mn: 0.20˜0.30%, Al: 0.001˜0.0025%, O: 0.005˜0.02%, C≤0.005%, S≤0.005%, N≤0.005%, and Ti≤0.002%, the balance being Fe and other inevitable impurities; and Al/Si≤0.006 and Mn/Si≤0.2,
wherein the steel has a ternary inclusion of SiO 2 —Al 2 O 3 —MnO, wherein volume percentage of SiO 2 is 95˜98%, volume percentage of Al 2 O 3 is 2%˜3%, and volume percentage of MnO is 2% or less.

2. The non-oriented electrical steel according to claim 1 , wherein grade of silicate-based oxide inclusions in the steel is 1.5 or less.

3. The non-oriented electrical steel according to claim 2 , wherein grade of silicate-based oxide inclusions in the steel is 1.0 or less.

4. The non-oriented electrical steel according to claim 1 , wherein the steel has a grain size of 45 μm or more.

5. The non-oriented electrical steel according to claim 4 , wherein the steel has a grain size of 50 μm or more.

6. The non-oriented electrical steel according to claim 1 , wherein Al/Si is 0.003 or less.

7. The non-oriented electrical steel according to claim 1 , wherein the steel has an iron loss P 15/50 of 3.8 W/kg or less, and a magnetic induction of 1.64 T or more.

8. The non-oriented electrical steel according to claim 7 , wherein the iron loss P 15/50 is 3.3 W/kg or less.

9. A method for manufacturing the non-oriented electrical steel of claim 1 , comprising the following steps in order:
(1) smelting;
(2) hot rolling: a slab heating temperature being 850°01250° C., and a final rolling temperature being 800-1050° C.;
(3) acid pickling;
(4) cold rolling;
(5) annealing: a temperature during annealing is controlled to 620° C.˜900° C.;
(6) coating: thereby producing the non-oriented electrical steel of claim 1 .

10. The method of claim 9 , wherein grade of silicate-based oxide inclusions in the non-oriented electrical steel is 1.5 or less.

11. The method of claim 10 , wherein the non-oriented electrical steel has a grain size of 45 μm or more.

12. The method of claim 10 , the steel has an iron loss P 15/50 of 3.8 W/kg or less, and a magnetic induction of 1.64 T or more.

Assignees

• Baoshan Iron & Steel

Inventors

• Lv Xuejun
• Zhang Feng
• Zong Zhenyu
• Song Yanli
• Chen Lingyun
• Wang Bo
• Xie Shishu

Classifications

• C21D8/00

  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) · CPC title

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• Y02P10/20

  Recycling · CPC title

• C21D8/12 Primary

  during manufacturing of articles with special electromagnetic properties · CPC title

• H01F1/147

  Alloys characterised by their composition {(treatment thereof for enhancing their electromagnetic properties C21D8/12)} · CPC title