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Production process of high-precision cold-rolled oriented silicon steel strips

A technology of oriented silicon steel and production process, which is applied in the field of production process of high-precision cold-rolled oriented silicon steel strip, can solve problems such as low production efficiency, high iron loss, and poor magnetic properties of products, and achieve process efficiency improvement, energy consumption reduction, production high efficiency effect

Active Publication Date: 2014-04-30
无锡华精新材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The disadvantage of the above process is mainly to remove carbon through two steps of "intermediate annealing" and "decarburization annealing and coating magnesium oxide". The process is lengthy and the conditions are harsh. Although qualified products can be produced, the disadvantage is that the product has poor magnetic properties. , high iron loss, low production efficiency and large energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Hot-rolled coil (raw material): the specification is thickness × width = 2.0mm × 1300mm, the coil weight is 20 tons, the carbon content is 0.0325%, the silicon content is 2.864%, the manganese content is 0.05%, the sulfur content 0.03%.

[0039] (2) Hot rolling: use dilute hydrochloric acid to remove the scale on the surface of the hot-rolled steel strip.

[0040] (3) One-time cold rolling: obtain the required thickness, ensure the shape of the plate, control the appropriate and constant reduction rate, and require it to be guaranteed at 60%, to ensure a certain amount of bits in the primary recrystallized matrix after decarburization annealing for the subsequent process To the more accurate (110) [001] grain, the final rolling thickness is 0.63mm.

[0041] (4) One-time decarburization by intermediate annealing: remove the carbon in the steel strip to a content less than 50PPm at one time, eliminate cold rolling work hardening, and carry out recrystallization to fo...

Embodiment 2

[0047] (1) Hot-rolled coil (raw material): the specification is thickness × width = 2.5mm × 1350mm, the coil weight is 25 tons, the carbon content is 0.045%, the silicon content is 3.385%, the manganese content is 0.01%, the sulfur content 0.02%.

[0048] (2) Hot rolling: use dilute hydrochloric acid to remove the scale on the surface of the hot-rolled steel strip.

[0049] (3) One-time cold rolling: obtain the required thickness, ensure the shape of the plate, control the appropriate and constant reduction rate, and require it to be guaranteed at 65%, so as to ensure a certain amount of bits in the primary recrystallized matrix after decarburization annealing for the subsequent process. To the more accurate (110) [001] grain, the final rolling thickness is 0.63mm.

[0050] (4) One-time decarburization by intermediate annealing: remove the carbon in the steel strip to a content less than 50PPm at one time, eliminate cold rolling work hardening, and carry out recrystallization...

Embodiment 3

[0056] (1) Hot-rolled coil (raw material): the specification is thickness × width = 2.2mm × 1320mm, the coil weight is 22.5 tons, the carbon content is 0.035%, the silicon content is 3.025%, the manganese content is 0.075%, the sulfur content 0.025%.

[0057] (2) Hot rolling: use dilute hydrochloric acid to remove the scale on the surface of the hot-rolled steel strip.

[0058] (3) One-time cold rolling: obtain the required thickness, ensure the shape of the plate, control the appropriate and constant reduction rate, and require it to be guaranteed at 62%, to ensure a certain amount of bits in the primary recrystallized matrix after decarburization annealing for the subsequent process To the more accurate (110) [001] grain, the final rolling thickness is 0.63mm.

[0059] (4) One-time decarburization by intermediate annealing: remove the carbon in the steel strip to a content less than 50PPm at one time, eliminate cold rolling work hardening, and carry out recrystallization to...

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Abstract

The invention discloses a production process of high-precision cold-rolled oriented silicon steel strips. The production process comprises the following steps of: (1) acceptance for hot rolling silicon steel coils: checking the specification, coil weight, carbon content, silicon content, manganese content and sulfur content of hot rolling coil raw materials, and carrying out acid washing for acceptable materials; (2) first cold rolling: carrying out 3-4 passes of cold rolling, and ensuring the percentage of reduction in a certain range; (3) intermediate annealing with one time for decarburization: decarburizing carbon in steel strips one time to the necessary requirements, generating silicon dioxide on surfaces, carrying out recrystallization, and forming (110)[001] primary recrystallized grains; (4) second cold rolling: increasing (110)[001] grain components in a recrystallization texture; (5) coating of magnesium oxide: coating magnesium oxide coatings on the surfaces of the silicon steel strips; (6) and high temperature annealing: carrying out recrystallization, grain growth and steel purification under the conditions of high temperature and pure hydrogen, and obtaining secondary recrystallization products with a single position direction. The products have high magnetic property, low iron loss, high production efficiency and low energy consumption.

Description

technical field [0001] The invention relates to a production process of a high-precision cold-rolled oriented silicon steel strip. Specifically, it is widely used in the key material of electrical appliances for directional magnetic field changes—the iron core, which belongs to the technical field of functional magnetic materials. Background technique [0002] Oriented silicon steel strip is a new type of functional magnetic material. Because of its high resistance, the electric energy consumed on the iron core is small during operation; because its magnetization has strong directionality, the magnetic field in the desired direction High sensitivity, high utilization rate of iron core, high operating efficiency, cold-rolled oriented silicon steel strip is the most critical and important iron core material in electromagnetic directional conversion products such as transformers and transformers, the production technology level of cold-rolled oriented silicon steel strip, direc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/12
Inventor 龚建达
Owner 无锡华精新材股份有限公司
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