High-silicon-steel thin belt and preparation method thereof

Abstract

The invention belongs to the fields of metallurgical technology and material science, and in particular relates to a high-silicon-steel thin belt and a preparation method thereof. High silicon steel is mainly applied to manufacture iron cores in a high-frequency motor, a transformer and a high-frequency choke coil and comprises the following chemical components in percentage by weight: 6.5 percent of Si, 0.01-0.6 percent of Al, 0.4-0.8 percent of Mn, no more than 0.003 percent of N, no more than 0.005 percent of S, no more than 0.01 percent of P, no more than 0.003 percent of O, no more than 0.004 percent of C and the balance of Fe and unavoidable impurities. The content of the impurities and harmful gases is reduced in the high silicon steel by vacuum melting to ensure the purity of molten steel, then, the high silicon steel is cast and rolled with the casting temperature of 1470-1510 DEG C, and the thickness of a cast belt is 1.5-2.0mm; after being taken out of a cast roll, cooling by spraying water, heat insulating and warm rolling are carried out on the cast belt, and finally, a product is obtained by recrystallization annealing. When being used for producing the high silicon steel, the technology of the invention has the advantages of small investment, energy saving, environmental protection, high lumber recovery and good product magnetism.

Description

technical field [0001] The invention belongs to the field of metallurgical technology and material science. Specifically relates to a high-silicon steel thin strip used for high-frequency motor or transformer iron core and a preparation method thereof. Background technique [0002] Silicon steel is an important soft magnetic material used in the electric power and telecommunications industry to manufacture generators, motors, transformers and other electrical instruments. The silicon content has an important impact on the magnetic properties of silicon steel products. With the increase of silicon content, the core loss of the product reduce. High-silicon steel, especially silicon steel sheet with a silicon content of 6.5wt%, has low high-frequency iron loss, close to zero magnetostriction, and high magnetic permeability, so it becomes an ideal iron core material for making medium and high-frequency motors and transformers. [0003] In recent years, as the motor speed under...

AI Technical Summary

Problems solved by technology

For a long time, there have been few reports on the research on the production of high-silicon steel by twin-roll strip casting and rolling technology. In the few literature reports, one or more of the following measures have been taken to improve the processability and annealing of high-silicon steel cast strips. The magnetic properties of the finished product: In terms of the composition of the alloy, in addition to Fe, Si, Mn and Al, one or more of alloying elements such as Cr, Mo, Ni, Sn, B, and rare earth are added; In terms of rolling equipment, copper casting rolls with strong cooling capacity but expensive cost are used; in terms of casting and rolling process, the roll gap is required to be less than 1mm, and the thickness of the cast strip should be as close as possible to the finished product; and a one-pass or two-pass hot rolling process is adopted , or cancel the hot rolling process and adopt the warm rolling process, it is required to have a rolling process with a reduction greater than 70%; the above measures increase the production cost to varying degrees, or put forward strict requirements for the production equipment and process