Method for manufacturing non-oriented high-silicon steel cold-rolled sheet based on strip cast rolling and DID (deformation induced disordering)

A technology for thin strip casting and cold rolling, applied in the field of metallurgy, can solve the problems of low cold working performance of non-oriented high silicon steel, deterioration of magnetic properties of final products, unsatisfactory magnetic induction value, etc., and achieves low equipment requirements and room temperature toughness. Improve and optimize the effect of magnetic performance

Active Publication Date: 2015-11-18
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Non-oriented high-silicon steel (Si≈6.5wt.%) has excellent soft magnetic properties, such as high resistance at high frequencies, high magnetic permeability, high magnetization, close to zero magnetostriction, and very low eddy current and hysteresis loss, etc.; therefore, it is an ideal magnetic material when manufacturing high-frequency motors and transformers; however, as the Si content increases, ordered phases B2 (FeSi) and DO will appear inside it 3 (Fe 3 Si); therefore, the cold workability of non-oriented high-silicon steel is greatly reduced, making it difficult to be produced under the traditional process, especially in the cold rolling process
[0003] Around the 1980s, Japan Steel Tube Corporation (NKK) successfully produced non-oriented high-silicon steel sheets by chemical vapor deposition (CVD), but the magnetic induction value of the final product was not satisfactory; in addition, due to the siliconized substance SiCl 4 The st

Method used

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  • Method for manufacturing non-oriented high-silicon steel cold-rolled sheet based on strip cast rolling and DID (deformation induced disordering)
  • Method for manufacturing non-oriented high-silicon steel cold-rolled sheet based on strip cast rolling and DID (deformation induced disordering)
  • Method for manufacturing non-oriented high-silicon steel cold-rolled sheet based on strip cast rolling and DID (deformation induced disordering)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Smelting molten steel, its composition is C0.005%, Si6.5%, N0.003%, O0.002%, S0.004% by weight percentage, and the balance is Fe;

[0030] The molten steel in the molten state is cast and rolled by thin strip casting and rolling equipment, and air-cooled to room temperature to obtain a cast strip with a thickness of 2.5 mm and an equiaxed grain structure with an average grain size of 240 μm; the pouring temperature during casting and rolling is 1565°C; the superheat of molten steel on the upper surface of the molten pool is 10°C during pouring; the appearance of the cast strip is as follows figure 1 As shown, the internal organization is as figure 2 shown;

[0031] The cast strip is hot-rolled into a hot-rolled plate, the rolling speed is 3m / s, the starting temperature of each pass is 1050±10°C, and the total hot-rolling reduction rate is 52%;

[0032] The hot-rolled sheet is warm-rolled into a warm-rolled sheet, and the strain-induced disorder effect occurs during t...

Embodiment 2

[0036] Smelting molten steel, its composition by weight percentage is C0.004%, Si6.4%, N0.003%, O0.003%, S0.003%, and the balance is Fe;

[0037]The molten steel is cast and rolled by thin strip casting and rolling equipment, and air-cooled to room temperature to obtain a cast strip with a thickness of 3 mm and an equiaxed grain structure with an average grain size of 270 μm; the pouring temperature during casting and rolling is 1570 ℃; the superheat of molten steel on the upper surface of the molten pool is 15℃ during pouring;

[0038] The cast strip is hot-rolled into a hot-rolled plate, the rolling speed is 3m / s, the starting temperature of each pass is 1050±10°C, and the total hot-rolling reduction rate is 57%;

[0039] The hot-rolled sheet is warm-rolled into a warm-rolled sheet, and the strain-induced disorder effect occurs during the warm-rolling process. The starting temperature of each pass is 100±5°C, the final rolling temperature is 80±5°C, and the total pressure of...

Embodiment 3

[0043] Smelting molten steel, its composition by weight percentage is C0.003%, Si6.6%, N0.002%, O0.003%, S0.004%, and the balance is Fe;

[0044] The molten steel in the molten state is cast and rolled by thin strip casting and rolling equipment, and air-cooled to room temperature to obtain a cast strip with a thickness of 2.6 mm, an equiaxed grain structure, and an average grain size of 200 μm; the pouring temperature during casting and rolling is 1575°C; the superheat of molten steel on the upper surface of the molten pool is 20°C during pouring;

[0045] The cast strip is hot-rolled into a hot-rolled plate, the rolling speed is 3m / s, the starting temperature of each pass is 1050±10°C, and the total hot-rolling reduction rate is 62%;

[0046] The hot-rolled sheet is warm-rolled into a warm-rolled sheet, and the strain-induced disorder effect occurs during the warm-rolling process. The starting temperature of each pass is 100±5°C, the final rolling temperature is 80±5°C, and ...

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Abstract

The invention relates to a method for manufacturing a non-oriented high-silicon steel cold-rolled sheet based on strip cast rolling and DID (deformation induced disordering), belonging to the technical field of metallurgy. The method comprises the following steps: (1) smelting liquid steel, wherein the liquid steel comprises the following components in percentage by weight: less than or equal to 0.005% of C, 6.4%-6.6% of Si, less than or equal to 0.003% of N, less than or equal to 0.003% of O, less than or equal to 0.005% of S and the balance of Fe; (2) carrying out cast rolling by virtue of sheet cast rolling equipment, and carrying out air cooling until reaching the room temperature; (3) manufacturing hot rolled plates by virtue of hot rolling; (4) manufacturing warm rolled plates by virtue of warm rolling, wherein a strain induced disorder effect is generated during the warm rolling; (5) manufacturing cold rolled plates by virtue of cold rolling; and (6) carrying out annealing at 900-1150 DEG C. According to the method, by virtue of a strip cast rolling process, the optimal warm-rolling reduction rate is selected, and an intermediate annealing process is omitted, so that the energy consumption is reduced, the magnetic performance of products after annealing is excellent, the procedures are simple, and equipment requirements are low.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for manufacturing non-oriented high-silicon steel cold-rolled sheets based on strip casting and DID. Background technique [0002] Non-oriented high-silicon steel (Si≈6.5wt.%) has excellent soft magnetic properties, such as high resistance at high frequencies, high magnetic permeability, high magnetization, close to zero magnetostriction, and very low eddy current and hysteresis loss, etc.; therefore, it is an ideal magnetic material when manufacturing high-frequency motors and transformers; however, as the Si content increases, ordered phases B2 (FeSi) and DO will appear inside it 3 (Fe 3 Si); Therefore, the cold workability of non-oriented high-silicon steel is greatly reduced, making it difficult to be produced under the traditional process, especially in the cold rolling process. [0003] Around the 1980s, Japan Steel Tube Company (NKK) successfully ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C21D8/12
Inventor 刘振宇王项龙李昊泽李成刚曹光明王国栋
Owner NORTHEASTERN UNIV
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