High-efficiency non-oriented silicon steel and preparation method thereof

A high-efficiency technology for oriented silicon steel, applied in the field of metallurgy, can solve problems such as high annealing temperature, coarse grains of hot-rolled coils, and broken strips

Inactive Publication Date: 2019-07-23
ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silicon content produced by this method is relatively high Si: 2.90-3.00%. If the normalization temperature is 850-870°C after leveling, the normalization temperature is low, and it is difficult to ensure uniform and coarse ferrite structure.
And due to the coarse grains of hot-rolled coils, it is very easy to cause strip breakage accidents during cold rolling
In addition, the annealing temperature of this invention is 980-1000°C, and the annealing temperature is too high, which makes it difficult for the previous hot-rolled coarse ferrite grains to be inherited into the finished product grain structure, and the final product grain size is similar to the hot-rolled unflattened grain size

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The chemical components in high-efficiency non-oriented silicon steel in Example 1 include: C 0.0025%, Si1.1%, Als 0.3%, Mn 0.5%, Sn 0.03%, P 0.012%, S 0.0025%, N 0.0018%, Nb0 .0010%, V 0.0008%, Ti 0.0007%, and the rest are Fe and unavoidable impurities.

[0035] In embodiment 1, production process comprises the following steps successively:

[0036] S1 hot metal KR desulfurization, S content in hot metal ≤0.040%, Nb content ≤0.005%, V content ≤0.06%, Ti content ≤0.10%, and temperature ≥1330℃, S content in hot metal after KR desulfurization ≤0.0020% , and the temperature is ≥1300°C;

[0037] S2 converter steelmaking, the tapping temperature is 1665±15°C, the C content at the end of the converter is 0.03-0.06%, and the S content is ≤0.0025%;

[0038] S3RH vacuum refining, the tapping temperature is 1584±5℃;

[0039] S4 continuous casting, using electromagnetic stirring in the mold, the equiaxed crystal ratio of the continuous casting slab is 65%, and the thickness of ...

Embodiment 2

[0049] The chemical components in the high-efficiency non-oriented silicon steel in Example 2 include: C 0.0025%, Si 1.5%, Als 0.5%, Mn 0.54%, Sn 0.03%, P 0.012%, S 0.0018%, N 0.0012%, Nb0 .0004%, V 0.0010%, Ti 0.0005%, and the rest are Fe and unavoidable impurities.

[0050] In embodiment 2, production process comprises the following steps successively:

[0051] S1 hot metal KR desulfurization, S content in hot metal ≤0.040%, Nb content ≤0.005%, V content ≤0.06%, Ti content ≤0.10%, and temperature ≥1330℃, S content in hot metal after KR desulfurization ≤0.0020% , and the temperature is ≥1300°C;

[0052] S2 converter steelmaking, the tapping temperature is 1665±15°C, the C content at the end of the converter is 0.03-0.06%, and the S content is ≤0.0025%;

[0053] S3RH vacuum refining, the tapping temperature is 1584±5℃;

[0054] S4 continuous casting, using mold electromagnetic stirring, the equiaxed crystal ratio of continuous casting slab is 63%, and the thickness of conti...

Embodiment 3

[0063] The chemical components in high-efficiency non-oriented silicon steel in Example 3 include: C 0.0018%, Si1.8%, Als 0.6%, Mn 0.4%, Sn 0.04%, P 0.018%, S 0.0016%, N 0.0014%, Nb0 .0012%, V 0.0008%, Ti 0.0007%, and the rest are Fe and unavoidable impurities.

[0064] In embodiment 3, production process comprises the following steps successively:

[0065] S1 hot metal KR desulfurization, S content in hot metal ≤0.040%, Nb content ≤0.005%, V content ≤0.06%, Ti content ≤0.10%, and temperature ≥1330℃, S content in hot metal after KR desulfurization ≤0.0020% , and the temperature is ≥1300°C;

[0066] S2 converter steelmaking, the tapping temperature is 1665±15°C, the C content at the end of the converter is 0.03-0.06%, and the S content is ≤0.0025%;

[0067] S3RH vacuum refining, the tapping temperature is 1584±5℃;

[0068] S4 continuous casting, using electromagnetic stirring in the mold, the equiaxed crystal ratio of the continuous casting slab is 65%, and the thickness of ...

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Abstract

The invention discloses high-efficiency non-oriented silicon steel and a preparation method thereof. The high-efficiency non-oriented silicon steel comprises the chemical components in percentage by mass of at most 0.005% of C, 1.0-2.0% of Si, 0.2-0.8% of Als, 0.25-0.8% of Mn, 0.01-0.05% of Sn, at most 0.02% of P, at most 0.0040% of S, at most 0.0020% of N, at most 0.0020% of Nb, at most 0.0020% of V, at most 0.0020% of Ti and the rest of Fe and unavoidable impurities. The high-efficiency non-oriented silicon steel and the preparation method have the advantages that by the strict component control in steelmaking, the impurity elements meeting the target requirement is ensured; by hot skin rolling, high temperature normalizing, induction heating before cold rolling, annealing and rapid warming and a low temperature long-time insulation process, the high-efficiency non-oriented silicon steel is obtained; and the iron loss of a finished product is P1.5/50<=3.2W/kg, and magnetic inductionis B50>=1.73T.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a high-efficiency non-oriented silicon steel and a preparation method thereof. Background technique [0002] Non-oriented silicon steel is an important magnetic material for manufacturing various types of motor cores, and is widely used in various types of home appliance compressors and industrial motors. In recent years, with the continuous upgrading of motor energy consumption, the requirements for the magnetic properties of silicon steel are also increasing. It is hoped to obtain high-efficiency non-oriented silicon steel with high magnetic induction and lower iron loss. [0003] At present, major domestic steel mills have also reported many related reports on high-efficiency non-oriented silicon steel with low iron loss and high magnetic induction. Patent Publication No. CN106702260A "A High Magnetic Induction Low Iron Loss Non-Oriented Silicon Steel and Its Production Me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21C7/10C21D8/12C21D1/26C21D1/42
CPCC21C7/10C21D1/26C21D1/42C21D8/1222C21D8/1233C21D2211/005C22C38/001C22C38/002C22C38/004C22C38/008C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14Y02P10/20Y02P10/25
Inventor 吴圣杰李慧张淑娟李化龙汪剑飞
Owner ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD
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