Method for producing oriented silicon steel with excellent magnetic property

Abstract

The invention relates to a method for producing an oriented silicon steel with excellent magnetic property, which comprises the following steps: 1) smelting in a routine mode, heating a slab; 2) heating the slab, hot rolling to form a strip steel; 3) normalization processing in two phases firstly heating to the temperature of 1100-1200 DEG C, then cooling to the temperature of 900-1000 DEG C in 50-200 seconds, then quenching in water with the temperature of 10-100 DEG C; applying tension on the strip steel, wherein the magnitude of the stress on the strip steel in the temperature range of 900-500 DEG C is 1-200 N / mm<2>; 4) cold rolling: carrying out primary a cold rolling, or a secondary cold rolling with intermediate annealing; 5) performing primary recrystallization annealing, then coating an annealing isolation agent which takes MgO as a main part, carrying out finished product annealing composed of secondary recrystallization annealing and purification annealing. According to the invention, martensite content and its distribution in normalized steel plate can be optimized by adjusting the stress on steel plate during normalized phase transition, the martensite content is in the scope within which the better finished product magnetic property can be acquired, and the finished product magnetic property optimization can be realized.

Description

Technical field [0001] The invention relates to a production method of oriented silicon steel, in particular to a production method of oriented silicon steel with excellent magnetic properties. Background technique [0002] Oriented silicon steel is an important soft magnetic alloy indispensable in the power, electronics and military industries. It is mainly used as transformer cores, generators and large motors. It requires excellent magnetic properties, especially low iron loss. [0003] Oriented silicon steel uses secondary recrystallization technology to make Goss texture (Goss texture: {110} crystal plane parallel to the rolling surface, <001> The grain direction is parallel to the rolling direction) abnormal grain growth occurs, and excellent rolling direction magnetic properties are obtained after the grains in other directions are absorbed. [0004] The traditional high magnetic induction oriented silicon steel production method is as follows: [0005] The slab is heate...

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Problems solved by technology

[0007] 1. The heating temperature is high, and the burning loss of the slab is large;

[0008] 2. The heating furnace needs to be repaired frequently, and the production efficiency is low;

[0009] 3. The hot-rolling temperature is high, and the hot-rolled edge cracks are large;

The disadvantage of this patent is that it is difficult to realize the uniformity of cooling rate in the thickness direction of the plate, which leads to the inhomogeneous distribution of martensite in the direction of plate thickness; also because of the inhomogeneity, it is difficult to realize the effective distribution of martensite control

Moreover, water is used to control the cooling rate from 700 to 900°C to room temperature. First, it is easily limited by site conditions, such as air temperature, nozzle damage or blockage, which may lead to instability of cooling rate; Human factors are large, and it is difficult to achieve precise control, making it difficult to achieve fine-tuning of cooling speed

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