Non-oriented electrical steel sheets with excellent magnetic properties and method for manufacturing the same

一种取向电工钢板、钢板的技术，应用在磁性材料、制造工具、磁性物体等方向，能够解决观察值范围窄、硫化物和氮化物误差等问题，达到优良磁性、抑制晶核形成、晶粒尺寸均匀的效果

Inactive Publication Date: 2007-12-05
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the range of observed values ​​obtained is very narrow, measuring the size and amount of sulfides and nitrides generated during the manufacturing process involves many errors

Method used

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  • Non-oriented electrical steel sheets with excellent magnetic properties and method for manufacturing the same
  • Non-oriented electrical steel sheets with excellent magnetic properties and method for manufacturing the same
  • Non-oriented electrical steel sheets with excellent magnetic properties and method for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0077] Each of the steel ingots having the composition as shown in Table 1 below was reheated at a temperature of 1180°C and hot rolled to 2.5 mm, then wound and cooled in the air at a temperature of 720°C. The coiled and cooled steel plate is pickled with acid and then cold rolled to a thickness of 0.5 mm. The cold-rolled steel sheet is finally annealed for 90 seconds at a temperature of 1000°C (Steel 1 and 2) and a temperature of 900°C (Steel 3, 4, 5) in a mixed gas atmosphere of 30% hydrogen and 70% nitrogen . The annealed steel was cut and then checked for magnetic properties, and the results are shown in Table 2 below.

[0078] Figures 1 to 5 show the phase transformation of each steel caused by changes in the content of Si, Al, and Mn. Figures 1 to 5 show the phase changes with temperature (y-axis) and Si content (x-axis) calculated using the FactSage program. The value of m (=Mn-Al) is -0.3 for steel 1, 0 for steel 2, 0.8 for steel 3, 1.2 for steel 4, and 1.4 for steel 5.

...

example 2

[0087] Each of the steel ingots having the composition as shown in Table 3 below was reheated at a temperature of 1180°C and hot rolled to 2.5 mm, then wound and cooled in the air at a temperature of 720°C. The coiled and cooled steel sheet is pickled with acid and then cold rolled to a thickness of 0.5 mm. The cold rolled steel sheet is finally annealed for 90 seconds in a mixed gas atmosphere of 30% hydrogen and 70% nitrogen at a temperature of 1000°C. The annealed steel was cut and then checked for magnetic properties, and the results are shown in Table 4 below.

[0088] table 3

[0089] steel

C

Si

Mn

Al

P

Fe

6

0.0025

1.2

0.6

0.4

0.010

Margin

7

0.0026

1.6

0.6

0.4

0.010

Margin

8

0.0025

1.9

0.6

0.4

0.011

Margin

9

0.0026

1.4

0.8

0.4

0.010

Margin

...

example 3

[0105] The steel ingots for steel 7 and 10 were reheated at a temperature of 1180°C, hot rolled to 2.5 mm and then coiled, while changing the hot finishing rolling conditions as shown in Table 6 below, and then as shown in Table 6. Winding as shown in. The hot rolled plate is pickled with acid and then cold rolled to a thickness of 0.5 mm. The cold-rolled steel sheet is annealed in a mixed gas atmosphere of 30% hydrogen and 70% nitrogen at a temperature of 1000°C for 90 seconds. The annealed steel was cut and then checked for magnetic properties, and the results are shown in Table 6 below.

[0106] Table 6

[0107] No.

steel

In the two-phase area

Of rolling accounted for the total heat

Final rolling ratio (%)

Final rolling

Secondary temperature

(℃)

Final rolling

Press down

Rate (%)

Winding temperature

Degree (℃)

Iron loss

(W15 / 50)

(W / kg)

Magnetic flux density

Degree (B50)

(Tesla)

Mark

1

...

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Abstract

The present invention relates to technology for manufacturing electrical steel sheets having excellent magnetic properties through the control of a hot-rolled texture using the phase transformation of steel. More particularly, it relates to a non-oriented electrical steel sheet that has reduced iron loss and increased magnetic flux density by controlling alloy component elements and optimizing hot-rolling conditions, even though hot-rolled sheet annealing is not carried out, as well as a manufacturing method thereof. More specifically, the invention provides a non-oriented electrical steel sheet which has excellent magnetic properties while hot-rolled sheet annealing can be omitted, the steel sheet being comprised of 0.005 wt% or less of C, 1.0-3.0 w% of Si, 0.1-2.0 wt% of Mn, 0.1 wt% or less of P, 0.1-1.5 wt% of Al, and a remainder of Fe and other inevitable impurities, in which the relationship between the elements Mn and Al satisfies an equation of -0.2 < m (=Mn-Al) < 1.0, and a slab for the steel sheet, when reheated, has a two-phase region of austenite + ferrite at a temperature ranging from ArI to 1250 DEG C.

Description

Technical field [0001] The present invention relates to non-oriented electrical steel sheets used as iron cores for electrical equipment such as motors, transformers, and magnetic shields. More specifically, the present invention relates to a non-oriented electrical steel sheet having reduced iron loss and increased magnetic flux density even when hot-rolled sheet annealing is not performed by controlling alloy component elements and optimizing hot rolling conditions, and a method of manufacturing the same . Background technique [0002] Non-oriented electrical steel sheet is an important part required to convert electrical energy into mechanical energy in electrical equipment. In order to reduce energy, a change in the magnetic properties of the steel sheet is required, that is, to reduce iron loss and increase magnetic flux density. Iron loss means energy loss as heat in energy conversion, and magnetic flux density is expressed as a force to generate electricity. If the iron lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12
CPCC21D9/46C21D8/1272C22C38/002C22C38/04C21D8/1222C21D8/1233C22C38/60C22C38/06H01F1/14791C22C38/004C22C38/008C22C38/02H01F1/16C21D8/1205
Inventor 崔栽荣裴秉根朴种泰金在宽朴哲民
Owner POHANG IRON & STEEL CO LTD
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