Rolling method for high silicon steel thin strip

Abstract

The invention discloses a rolling method for a high silicon steel thin strip. The method comprises the following steps: 1) hot rolling: heating a high silicon steel cast strip which is prepared by a twin roll strip continuous casting process and 2 to 4 mm in thickness as a raw material to 900 to 1100 DEG C under a protection atmosphere, and performing at least one-pass hot rolling till the thickness is 1 to 1.2 mm, wherein the total reduction rate of the hot rolling is 50 to 60 percent; 2) warm rolling: heating the high silicon steel hot cast strip treated in the previous step to 320 to 500 DEG C, and performing at least one-pass hot rolling till the thickness is 0.4 to 0.5 mm, wherein the total reduction rate of the warm rolling is 50 to 70 percent; 3) acid pickling: removing oxide on thesurface of the high silicon steel warm cast strip for cleaning the surface; 4) cold rolling at room temperature: performing multi-pass cold rolling on the high silicon steel warm cast strip subjectedto acid pickling at room temperature with a small reduction rate, wherein the reduction rate of each pass of cold rolling is not larger than 25 percent till the required high silicon steel finished product thickness is reached. By adopting the method, the high silicon steel thin strip has high surface quality, good plate shape and superior annealed magnetic performance.

Description

technical field [0001] The invention relates to a method for rolling silicon steel, in particular to a method for rolling high-silicon steel strips. Background technique [0002] The silicon content in silicon steel sheets has a major impact on the characteristics of its products (magnetic induction and iron loss). But for Fe-Si alloy, especially when the Si content exceeds 4.5%, the brittleness of the silicon steel sheet also increases at the same time, and the elongation is almost zero, which makes the processing performance deteriorate sharply. This brings many difficulties to the further processing of the material, and also restricts the development of high-silicon steel with a silicon mass content above 4.5%. [0003] At present, the process of preparing high silicon steel can be roughly divided into traditional rolling method, extremely cold strip method, spray forming method, chemical vapor deposition diffusion method and twin-roll thin strip casting and rolling tech...

AI Technical Summary

Problems solved by technology

[0004] The basic process of the traditional rolling method is smelting-hot rolling-cold rolling. Due to the poor mechanical processing and hot processing performance of high-silicon steel, the problem has not been solved. For a long period of time, there has been almost no breakthrough in the cold rolling process.

However, the further rolling of the cast strip obtained by the twin-roll casting method by the conventional rolling method faces the same dilemma as the traditional rolling method. Due to the high brittleness of the material, severe edge cracks and brittle fractures are prone to occur during the rolling process, and the magnetic properties Poor, seriously affecting the yield of high silicon steel thin strip products

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