CN103205547A - Method for preparing batch annealing low-grade non-oriented electrical steel - Google Patents
Method for preparing batch annealing low-grade non-oriented electrical steel Download PDFInfo
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Abstract
The invention relates to a method for preparing batch annealing low-grade non-oriented electrical steel. The method is characterized in that a low-carbon continuously cast sheet billet is used as a hot rolling raw material, wherein the thickness of a casting blank is 2.5-3.5mm, and the hot rolling raw material comprises the following elements by mass fraction; 0.004-0.008% of C, 0.60-0.80% of Si, 0.23-0.45% of Mn, less than or equal to 0.08% of P, less than or equal to 0.008% of S, less than or equal to 0.007% of N, less than or equal to 0.005% of O, 0.20-0.35% of Al and the balance of iron and unavoidable impurities; and seven-rack hot continuous rolling, five-rack cold continuous rolling and batch annealing are carried out so as to finally obtain the non-oriented electrical steel with excellent magnetic characteristics. The method has the advantages that the steel is low in silicon content and O and N contents, a cold rolling rate of 3.6-36% is adopted, and the low-grade non-oriented electrical steel with excellent magnetic characteristics and low cost is produced after batch annealing; and a final product has the specification of 0.65mm and magnetic characteristics of P15/50 equaling to 6.57-9.82W/Kg and B5000 equaling to 1.69-1.74T.
Description
Technical field:
The invention belongs to the electrical steel technical field, relate to the preparation method of the low code non-oriented electrical steel of a kind of bell-type annealing, this electrical steel has good magnetic properties.
Background technology:
At present, along with the fast development of China's electromechanical industries, the demand of electrical steel (silicon steel) is increasing.Compare with other steel grades, electrical steel has strict requirement to magnetic property, processing characteristics, insulativity, wherein magnetic property require to have low iron loss, high magnetic induction density and different magneticanisotropy.And non orientating silicon steel is mainly used in motor for silicon steel production, and the cast structure of the chemical ingredients of raw material and purity, slab, hot rolling technology, cold rolling and thermal treatment process all are the important factors that influences the silicon steel final quality.For this reason, the non-oriented electrical steel that a large amount of scientific efforts is developed low-iron loss high-magnetic strength has all been done by each iron and steel enterprise and scientific research institutions.For example: Chinese patent CN94107147.2 discloses a kind of production method of cold rolling non-orientation semi-technological electrical steel, it is characterized in that utilizing the Cu element in the steel to obtain good magnetic, but the product iron loss of producing is higher, and has increased smelting cost.Chinese patent 200610098391.0 and 200610031808.1 all discloses a kind of production method of semi-technological electrical steel, it is characterized in that adopting the CSP plate is the hot rolling raw material, and all added 0.15 ~ 0.8% Al, utilize Al to improve the ρ value, dwindle the γ district and impel grain growth, thereby the characteristics of reduction iron loss reach the purpose of excellent magnetic.And all added 0.015 ~ 0.12% Sn, Sb alloying element, improved production cost.Chinese patent 200310108197.2 and 200510027404.0 all discloses a kind of manufacture method of producing the cold rolling non-oriented electrical steel of low-iron loss high-magnetic strength, it is characterized in that all having added other alloying elements in the composition, has increased production cost.Be in detail: the element in the patent 200310108197.2 comprises one or more in Sn, Sb, Cu, Cr, Ni, B, the rare earth.
Summary of the invention:
The object of the present invention is to provide the preparation method of the low code non-oriented electrical steel of a kind of bell-type annealing, make this electrical steel have good magnetic properties, reduce production costs.
Technical scheme of the present invention is as follows:
Adopting low-carbon (LC) sheet blank continuous casting base is the hot rolling raw material, the thickness of strand is 2.5 ~ 3.5mm, the element massfraction of hot rolling material composition is: C:0.004 ~ 0.008%, Si:0.60 ~ 0.80%, Mn:0.23 ~ 0.45%, P≤0.08%, S≤0.008%, N≤0.007%, O≤0.005%, Al:0.20 ~ 0.35%, all the other are iron and other unavoidable impurities; Adopt 7 frame hot continuous rollings, 5 frame cold continuous rollings, bell-type annealing, finally obtain the non-oriented electrical steel of excellent in magnetic characteristics; Slab heating temperature is 920 ~ 1170 ℃ in the described operation of rolling, and be 0.5h ~ 1h heat-up time, 1013 ~ 1136 ℃ of hot rolling start rolling temperatures, and 870 ~ 930 ℃ of finishing temperatures, 680 ~ 750 ℃ of coiling temperatures are cold-rolled to 0.65mm after the pickling; Coil of strip after cold rolling is 75% nitrogen and 25% hydrogen bell-type annealing furnace annealing through the shielding gas volume ratio, and annealing temperature is 690～730 ℃, is cooled to the laggard line correlation material behavior of room temperature then and measures.
Magnetic properties P through the low code non-oriented electrical steel of above-mentioned preparation method preparation
15/50=6.57 ~ 9.82W/Kg, B
5000=1.69 ~ 1.74T.
The present invention compared with prior art, advantage of the present invention is: siliceous lower in the steel, and O, N content are lower, adopt 3.6 ~ 36% cold rolling draft, through bell-type annealing, produce the low low grade non-oriented silicon steel of excellent magnetic and cost; The finished product specification is 0.65mm, magnetic properties P
15/50=6.57 ~ 9.82W/Kg, B
5000=1.69 ~ 1.74T.
Description of drawings:
Fig. 1 is the microstructure metallograph of steel plate after 690 ℃ of annealing in the embodiment of the invention 1;
Fig. 2 is the microstructure metallograph of steel plate after 720 ℃ of annealing in the embodiment of the invention 1.
Embodiment:
Embodiment 1:
The chemical ingredients of continuously cast bloom is as follows:
Table 1 continuously cast bloom chemical ingredients unit: the %(quality)
Hot rolled strip thickness 3.0mm; carry out cold rolling after the hot rolled strip pickling behind the air cooling; through cold continuous rolling; draft is 3.6 ~ 36.0%; coil of strip after cold rolling is 75% nitrogen and 25% hydrogen bell-type annealing furnace annealing through shielding gas; annealing temperature is 690～730 ℃, obtains required electromagnetic performance and texture.Coil of strip after the annealing is coated with first organic coating, with insulation and the interlamination resistance of steel plate after the assurance punching.
Table 2 product core loss value, magnetic properties
Embodiment 2:
The chemical ingredients of continuously cast bloom is as follows:
Table 3 continuously cast bloom chemical ingredients unit: the %(quality)
Hot rolled strip thickness 3.0mm; carry out cold rolling after the hot rolled strip pickling behind the air cooling; through cold continuous rolling; draft is 3.6 ~ 36.0%; coil of strip after cold rolling is 75% nitrogen and 25% hydrogen bell-type annealing furnace annealing through shielding gas; annealing temperature is 690～730 ℃, obtains required electromagnetic performance and texture.Coil of strip after the annealing is coated with first organic coating, with insulation and the interlamination resistance of steel plate after the assurance punching.
Table 4 product core loss value, magnetic properties
Claims (2)
1. the preparation method of the low code non-oriented electrical steel of a bell-type annealing, it is characterized in that: adopting low-carbon (LC) sheet blank continuous casting base is the hot rolling raw material, and the thickness of strand is 2.5 ~ 3.5mm, and the element massfraction of hot rolling material composition is: C:0.004 ~ 0.008%, Si:0.60 ~ 0.80%, Mn:0.23 ~ 0.45%, P≤0.08%, S≤0.008%, N≤0.007%, O≤0.005%, Al:0.20 ~ 0.35%, all the other are iron and other unavoidable impurities; Adopt 7 frame hot continuous rollings, 5 frame cold continuous rollings, bell-type annealing, finally obtain the non-oriented electrical steel of excellent in magnetic characteristics; Slab heating temperature is 920 ~ 1170 ℃ in the described operation of rolling, and be 0.5h ~ 1h heat-up time, 1013 ~ 1136 ℃ of hot rolling start rolling temperatures, and 870 ~ 930 ℃ of finishing temperatures, 680 ~ 750 ℃ of coiling temperatures are cold-rolled to 0.65mm after the pickling; Coil of strip after cold rolling is 75% nitrogen and 25% hydrogen bell-type annealing furnace annealing through the shielding gas volume ratio, and annealing temperature is 690～730 ℃, is cooled to room temperature then.
2. the preparation method of the low code non-oriented electrical steel of bell-type annealing according to claim 1 is characterized in that: the magnetic properties P of the low code non-oriented electrical steel of preparation
15/50=6.57 ~ 9.82W/Kg, B
5000=1.69 ~ 1.74T.
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| CN2013101244545A CN103205547A (en) | 2013-04-11 | 2013-04-11 | Method for preparing batch annealing low-grade non-oriented electrical steel |
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| CN2013101244545A CN103205547A (en) | 2013-04-11 | 2013-04-11 | Method for preparing batch annealing low-grade non-oriented electrical steel |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526001A (en) * | 2013-09-24 | 2014-01-22 | 马钢(集团)控股有限公司 | Manufacturing method of cold-rolled non-oriented electrical steel for constant-frequency compressors |
| CN104138899A (en) * | 2014-06-23 | 2014-11-12 | 梧州恒声电子科技有限公司 | Control technology of hot-rolled steel plate |
| CN104726764A (en) * | 2013-12-23 | 2015-06-24 | 鞍钢股份有限公司 | Production method of non-oriented electrical steel |
| CN106929752A (en) * | 2017-02-17 | 2017-07-07 | 北京首钢股份有限公司 | A kind of low silicon non-oriented silicon steel and its transverse and longitudinal yield strength opposite sex control method |
| CN111349861A (en) * | 2020-03-24 | 2020-06-30 | 包头钢铁（集团）有限责任公司 | High-magnetic-induction non-oriented silicon steel for EI sheets in CSP process and production method thereof |
| CN111593262A (en) * | 2020-05-18 | 2020-08-28 | 包头钢铁（集团）有限责任公司 | Low-cost non-coating non-oriented silicon steel and production method thereof |
| CN114807559A (en) * | 2022-05-09 | 2022-07-29 | 国网智能电网研究院有限公司 | Low-loss low-magnetostriction oriented silicon steel material and preparation method thereof |
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| CN1796015A (en) * | 2004-12-28 | 2006-07-05 | 宝山钢铁股份有限公司 | Method for manufacturing cold rolling non oriented electrical steel through continuous casting and tandem rolling sheet bar |
| CN1948517A (en) * | 2005-10-15 | 2007-04-18 | 鞍钢集团新钢铁有限责任公司 | Manufacturing method of cold rolling electric steel special for compressor |
| CN102134675A (en) * | 2011-02-22 | 2011-07-27 | 武汉钢铁(集团)公司 | Non-oriented electrical steel for thin slab continuous casting-continuous rolling production and method thereof |
| CN102703805A (en) * | 2012-06-22 | 2012-10-03 | 内蒙古包钢钢联股份有限公司 | Normalized ship plate steel and production method thereof |
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Patent Citations (4)
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| CN1796015A (en) * | 2004-12-28 | 2006-07-05 | 宝山钢铁股份有限公司 | Method for manufacturing cold rolling non oriented electrical steel through continuous casting and tandem rolling sheet bar |
| CN1948517A (en) * | 2005-10-15 | 2007-04-18 | 鞍钢集团新钢铁有限责任公司 | Manufacturing method of cold rolling electric steel special for compressor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526001A (en) * | 2013-09-24 | 2014-01-22 | 马钢(集团)控股有限公司 | Manufacturing method of cold-rolled non-oriented electrical steel for constant-frequency compressors |
| CN103526001B (en) * | 2013-09-24 | 2015-04-01 | 马钢(集团)控股有限公司 | Manufacturing method of cold-rolled non-oriented electrical steel for constant-frequency compressors |
| CN104726764A (en) * | 2013-12-23 | 2015-06-24 | 鞍钢股份有限公司 | Production method of non-oriented electrical steel |
| CN104726764B (en) * | 2013-12-23 | 2017-04-26 | 鞍钢股份有限公司 | Production method of non-oriented electrical steel |
| CN104138899A (en) * | 2014-06-23 | 2014-11-12 | 梧州恒声电子科技有限公司 | Control technology of hot-rolled steel plate |
| CN106929752A (en) * | 2017-02-17 | 2017-07-07 | 北京首钢股份有限公司 | A kind of low silicon non-oriented silicon steel and its transverse and longitudinal yield strength opposite sex control method |
| CN111349861A (en) * | 2020-03-24 | 2020-06-30 | 包头钢铁（集团）有限责任公司 | High-magnetic-induction non-oriented silicon steel for EI sheets in CSP process and production method thereof |
| CN111593262A (en) * | 2020-05-18 | 2020-08-28 | 包头钢铁（集团）有限责任公司 | Low-cost non-coating non-oriented silicon steel and production method thereof |
| CN114807559A (en) * | 2022-05-09 | 2022-07-29 | 国网智能电网研究院有限公司 | Low-loss low-magnetostriction oriented silicon steel material and preparation method thereof |
| CN114807559B (en) * | 2022-05-09 | 2023-07-18 | 国网智能电网研究院有限公司 | Low-loss low-magnetostriction oriented silicon steel material and preparation method thereof |
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Application publication date: 20130717 |