Indirectional electric steel plate without corrugated fault and its making process

A technology of oriented electrical steel sheet without corrugation, which is applied in the direction of metal rolling, etc., can solve problems such as difficult floating of inclusions in the crystallizer, large reduction rate in the last pass of rough rolling, and influence on finishing rolling operation, so as to save heat Rolling plate normalization process, elimination of corrugated defects, and the effect of reducing production costs

Inactive Publication Date: 2004-11-24
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, when the low-temperature casting method is used, the continuous casting process is not easy to control, and the inclusions in the crystallizer are not easy to float up, and the number of inclusions in the continuous casting slab increases, which affects the quality of the final product
[0005] There is also the method of controlling the finishing of rough rolling (such as the special publication No. 53-2332 disclosed in the Japanese Patent Gazette), the temperature of the finishing of rough rolling is controlled to > 900 ° C, and the reduction rate of the last pass of rough rolling > 50%, Make the corrugated defects of the finished slab disappear; this not only requires high capacity of the rough rolling unit, but also the reduction rate

Method used

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  • Indirectional electric steel plate without corrugated fault and its making process

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Effect test

Embodiment 1

[0041] Smelt according to the components in Table 1, and obtain continuous casting slabs by continuous casting; then the continuous casting slabs are heated, rough rolled, and rough rolled for 4 passes, 25%→25%→40%→45% reduction rate / pass The final rough rolling temperature is 988°C; then finish rolling, the second pass of finish rolling is finished rolling with a roll with a roughness of 7 μm, and the hot-rolled sheet after finish rolling is coiled at a temperature of 710°C. There are no corrugated defects with a height of ≥3 μm in the finished board, and the magnetic properties are: B50=1.725T, P15 / 50=3.565W / kg.

Embodiment 2

[0043]Smelt according to the components in Table 1, and obtain continuous casting slabs by continuous casting; then the continuous casting slabs are heated, rough rolled, and rough rolled for 4 passes, 25%→30%→40%→40% reduction rate / pass The second time, the finishing rolling temperature of the rough rolling was 992°C, the second pass of the finish rolling was finished rolling with a roll with a roughness of 7 μm, coiled at 710°C, no corrugated defects with a height of ≥3 μm appeared in the finished plate, and the magnetic properties were: B50= 1.727T, P15 / 50=3.635W / kg.

Embodiment 3

[0045] Smelt according to the components in Table 1, and obtain continuous casting slabs by continuous casting; then the continuous casting slabs are heated, rough rolled, and rough rolled for 4 passes, 25%→30%→40%→40% reduction rate / pass The second time, the finishing rolling temperature of the rough rolling was 1002°C, the roll with a roughness of 7μm was used for the second finish rolling, and the coil was coiled at 710°C. There was no corrugated defect with a height of ≥3μm in the finished plate, and the magnetic properties were: B50=1.716T , P15 / 50=3.448W / kg.

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Abstract

The indirectional electrical steel plate without corrugated fault has the components including C0.006-0.01 wt%, Si 0-2.0 wt%, Al 0-0.4 wt% and Mn not higher than 1.0 wt% except Fe and inevitable impurity, with the Si/C ratio being 180-260. Its making process includes continuously casting plate blank; hot rough rolling for not more than 4 gates with total percentage reduction not less than 80 %, at least one gate of percentage reduction not less than 40 % and finish rolling temperature not lower than 980 deg.c; finish rolling with at least one roller of roughness not lower than 5 micron; and winding at temperature not lower than 710 deg.c. The optimized components and technological process mikes the steel plate product free from corrugated fault and high in physical performance. The omitting of normalizing step results in lowered production cost.

Description

technical field [0001] The invention relates to a non-oriented electrical steel sheet manufacturing technology, in particular to a non-oriented electrical steel sheet manufacturing technology for overcoming corrugated defects. Background technique [0002] Non-oriented electrical steel sheets are mainly used to produce iron core materials for motors. The components of the non-oriented electrical steel are (percentage by weight): C<0.01%, Si+Al>1.50%, Mn<1.0%, and the rest are iron and unavoidable impurities. The continuous casting method is used to produce non-oriented electrical steel. Since the αγ phase transformation basically does not occur during the heating and hot rolling process, the huge (100) columnar grains of the cast structure cannot be obtained due to the slow dynamic recovery and recrystallization during the hot rolling process. Thoroughly broken, forming very thick deformed grains extending along the rolling direction near the center of the hot-rol...

Claims

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Application Information

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IPC IPC(8): B21B1/30C21D8/12C22C38/02
Inventor 刘自成刘永勤陈晓黄望芽
Owner BAOSHAN IRON & STEEL CO LTD
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