High silicon steel for thin slab casting and rolling production and preparation method thereof

Abstract

The invention discloses high silicon steel for thin slab casting and rolling production. The high silicon steel comprises the following components in percentage by weight: less than or equal to 0.003 percent of C, 4.5-7.0 percent of Si, 0.25-1.0 percent of Mn, less than or equal to 0.008 percent of Al, less than or equal to 0.0050 percent of S, less than or equal to 0.0030 percent of N and less than or equal to 20PPm of [O]. The preparation method comprises the following steps: smelting; casting; heating the cast slab; rolling; coiling; insulating in a bell-type furnace; performing warm-rolling, namely performing cold rolling at a temperature of 150 to 500 DEG C; and annealing at a high temperature. On the basis of the conventional thin slab casting and rolling equipment, a proper casting process is adopted, the columnar crystal ratio is improved, and the columnar crystal size is reduced; and the hot-rolling process is controlled, a fine fiber structure is obtained, and the warm-rolling property is guaranteed. The high silicon steel with good processability and magnetic performance can be produced.

Description

technical field [0001] The invention relates to a silicon steel and a production method, in particular to a high-silicon steel produced by continuous casting and rolling of thin slabs and a preparation method. Background technique [0002] Although increasing the frequency of use of the iron core can significantly improve the working efficiency of the motor, and can greatly reduce the size and weight of the iron core. However, the increase in frequency will lead to an exponential increase in iron loss and a large loss of energy. It will also lead to increased magnetostriction and a sharp increase in noise, which will cause serious noise pollution to the environment. It restricts the high frequency and miniaturization of the motor. [0003] As the silicon content increases, the resistivity increases and the iron loss gradually decreases. When the silicon content reaches 6-8% SiWt, the iron loss is the smallest. As the Si content increases, the magnetic permeability increase...

AI Technical Summary

Problems solved by technology

[0011] The present invention aims at the inhomogeneity of the internal composition and structure existing in the prior art, which affects the uniformity of the magnetic properties, has extremely high requirements on the process equipment, and is also relatively polluted to the environment, or the pores and inclusions are difficult to control, or the surface quality and plate shape Poor and difficult to prepare, provide a high-silicon steel containing 4.5-7% silicon with a columnar crystal volume ratio of not less than 90%, obtain a finer fibrous structure, good processing type and magnetic properties, and its preparation method

Images