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

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 ...

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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 strong toxicity and corrosiveness of silicon steel make the production process very dangerous and low in production efficiency; steel researchers have developed new production methods of 6.5wt.%Si silicon steel sheets in recent years, such as asynchronous rolling method (Chinese Patent No. CN201110020170.2), rapid solidification method (Chinese Patent No. CN201410276483.8), multiple cold rolling method (Chinese Patent No. CN201410314987.4) and alloying method (Chinese Patent No. ) and other production methods, however, the above method is cumbersome to operate and requires high equipment requirements, and the purity of molten steel is reduced due to the addition of other chemical elements, which will deteriorate the magnetic properties of the final product to a certain extent

[0006] At present, the technology of combining thin strip casting and rolling with strain-induced disorder process to prepare non-oriented high-silicon steel has not been reported.

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