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Production method of cover type intermediate annealing high-grade non-oriented silicon steel 50BW350

A technology of oriented silicon steel and intermediate annealing, applied in the field of agricultural motors, can solve problems such as difficult production and achieve the effect of reducing equipment investment and process costs

Pending Publication Date: 2022-03-29
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] 50BW350 high-grade non-oriented silicon steel products are mainly used in air-conditioning and refrigerator inverter compressors. Compared with ordinary non-oriented silicon steel, high-grade non-oriented silicon steel has the characteristics of low iron loss, which can save a lot of electric energy and meet the national energy-saving and emission reduction requirements. , has a high added value of the product, and has a better market application prospect in the future, but the production is difficult, and the conventional production method requires electromagnetic stirring and normalizing annealing equipment

Method used

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  • Production method of cover type intermediate annealing high-grade non-oriented silicon steel 50BW350
  • Production method of cover type intermediate annealing high-grade non-oriented silicon steel 50BW350
  • Production method of cover type intermediate annealing high-grade non-oriented silicon steel 50BW350

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Experimental program
Comparison scheme
Effect test

example 1

[0034] S1. Steelmaking composition: the contents of C, Si, Mn, P, S, Als, Sb, O, N are: 0.003%, 1.85%, 0.85%, 0.013%, 0.0025%, 0.41%, 0.08%, 0.0018 %, 0.0021%, the balance is Fe and unavoidable inclusions; through the control of the smelting chemical composition of molten steel and the control of inclusions, slabs are obtained after continuous casting;

[0035] S2. The heating temperature of hot rolling is 1130°C; the hot rolling adopts high-temperature final rolling and high-temperature crimping, and the final rolling temperature is 880-890°C; the crimping temperature is 700-720°C;

[0036] S3. Cold-rolling process: hot-rolled plate → primary cold-rolling reduction 10% → bell annealing → secondary cold-rolling to 0.5mm → continuous annealing;

[0037] Bell annealing: In order to ensure full recrystallization and grain boundary segregation of Sb elements in the continuous annealing process, the mask annealing temperature is ≥ 730 ℃, and the holding time is more than 30 hours; ...

example 2

[0052] S1. Steelmaking composition: the contents of C, Si, Mn, P, S, Als, Sb, O, N are: 0.003%, 1.85%, 0.85%, 0.013%, 0.0025%, 0.41%, 0.08%, 0.0018 %, 0.0021%, the balance is Fe and unavoidable inclusions; through the control of the smelting chemical composition of molten steel and the control of inclusions, slabs are obtained after continuous casting;

[0053] S2. The heating temperature of hot rolling is 1130°C; the hot rolling adopts high-temperature final rolling and high-temperature crimping, and the final rolling temperature is 880-890°C; the crimping temperature is 700-720°C;

[0054] S3. Cold-rolling process: hot-rolled plate → primary cold-rolling reduction 10% → bell annealing → secondary cold-rolling to 0.5mm → continuous annealing;

[0055] Bell annealing: In order to ensure full recrystallization and grain boundary segregation of Sb elements in the continuous annealing process, the mask annealing temperature is ≥ 730 ℃, and the holding time is more than 30 hours; ...

example 3

[0069] S1. Steelmaking composition: the contents of C, Si, Mn, P, S, Als, Sb, O, N are: 0.003%, 1.85%, 0.85%, 0.013%, 0.0025%, 0.41%, 0.08%, 0.0018 %, 0.0021%, the balance is Fe and unavoidable inclusions; through the control of the smelting chemical composition of molten steel and the control of inclusions, slabs are obtained after continuous casting;

[0070] S2. The heating temperature of hot rolling is 1130°C; the hot rolling adopts high-temperature final rolling and high-temperature crimping, and the final rolling temperature is 880-890°C; the crimping temperature is 700-720°C;

[0071] S3. Cold-rolling process: hot-rolled plate → primary cold-rolling reduction 10% → bell annealing → secondary cold-rolling to 0.5mm → continuous annealing;

[0072] Bell annealing: In order to ensure full recrystallization and grain boundary segregation of Sb elements in the continuous annealing process, the mask annealing temperature is ≥ 730 ℃, and the holding time is more than 30 hours; ...

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Abstract

The invention relates to a production method of cover type intermediate annealing high-grade non-oriented silicon steel 50BW350. The production method comprises the steps of molten steel chemical component design, a hot rolling process, a cold rolling process, an annealing process and the like. The molten steel comprises the following chemical components: less than or equal to 0.004% of C, 1.80-2.1% of Si, 0.70-0.90% of Mn, 0.30-0.45% of Als, less than or equal to 0.015% of P, less than or equal to 0.0030% of S, less than or equal to 0.0020% of O, less than or equal to 0.0025% of N, 0.06-0.12% of Sb and the balance of Fe. The high-grade non-oriented silicon steel product without surface corrugation defects is obtained through special chemical design, Sb element addition, improvement of electromagnetic performance by optimizing the structure of the product, proper reduction of Si content, improvement of Mn element content and elimination of the influence of hot-rolled thick fiber tissues by a secondary cold rolling method. And compared with a traditional high-grade production method, the cost is low, and the produced silicon steel is excellent in electromagnetic performance.

Description

technical field [0001] The invention relates to the technical field of agricultural motors, in particular to a method for producing high-grade non-oriented silicon steel 50BW350 with bell-type intermediate annealing. Background technique [0002] 50BW350 high-grade non-oriented silicon steel products are mainly used in air-conditioning and refrigerator inverter compressors. Compared with ordinary non-oriented silicon steel, high-grade non-oriented silicon steel has the characteristics of low iron loss, which can save a lot of electric energy and meet the national energy-saving and emission reduction requirements. , has high product added value, and has better market application prospects in the future, but production is difficult, and conventional production methods require electromagnetic stirring and normalizing annealing equipment. [0003] At present, the conventional 50BW350 high-grade non-oriented silicon steel requires steelmaking electromagnetic stirring and normaliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/60C22C33/04C21D8/12C21D1/26
CPCC22C38/004C22C38/02C22C38/04C22C38/06C22C38/60C22C33/04C21D8/1222C21D8/1233C21D8/1272C21D8/1266C21D1/26C21D2201/05
Inventor 李毅伟李德君乔浩浩
Owner BENGANG STEEL PLATES
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