CN-122012857-A - Method for improving hit rate of narrow component of oriented silicon steel acid-soluble aluminum and application

Abstract

The invention provides a method for improving hit rate of acid-soluble aluminum narrow components of oriented silicon steel and application thereof. The method comprises the following steps of detecting the acid-soluble aluminum content of molten steel after an RH vacuum treatment process is finished and before continuous casting, and if the acid-soluble aluminum content is lower than 0.020wt%, supplementing aluminum into a ladle to adjust the acid-soluble aluminum content to be within a range of 0.020-0.035 wt%. In the process window after RH vacuum treatment and before continuous casting, the content of acid-soluble aluminum (Als) is difficult to be quickly, accurately and stably controlled to be 0.020-0.035 wt% which is a target range, so that the technical problems of large fluctuation of magnetic property, low yield of high grade and high production cost of oriented silicon steel (especially high magnetic induction Hi-B steel) are avoided.

Inventors

• CHEN SHUGUANG
• DENG BIRONG
• Qin Zhengfeng
• XIE JIANFU
• LI XINXIN
• TAN XIANCHAO

Assignees

• 湖南华菱涟钢特种新材料有限公司
• 湖南华菱涟源钢铁有限公司

Dates

Publication Date

20260512

Application Date

20260130

Claims (10)

1. 1. A method for improving hit rate of narrow component of acid-soluble aluminum of oriented silicon steel is characterized by comprising the following steps of detecting acid-soluble aluminum content of molten steel after RH vacuum treatment procedure is completed and before continuous casting, and if the content is lower than 0.020wt%, supplementing aluminum into a steel ladle to adjust the acid-soluble aluminum content to be within a range of 0.020-0.035 wt%.
2. 2. The method of claim 1, wherein the replenishing aluminum into the ladle is performed by inserting an aluminum rod into the molten steel within the ladle.
3. 3. The method of claim 1, wherein the aluminum bar has a diameter of 50-80 mm and a length of 1500-2500 mm and an insertion depth of 500-800 mm below the liquid level of the molten steel.
4. 4. The method of claim 1, wherein the metallic aluminum rod is inserted into the molten steel by an elongated inserter comprising an aluminum rod sleeve for receiving the aluminum rod and a fixing bolt for fixing the aluminum rod within the sleeve.
5. 5. The method according to claim 1, wherein the detection of the acid-soluble aluminum content is completed within 5-8 min after the RH vacuum treatment process, and the aluminum supplementing operation is performed within 2min after the detection is completed.
6. 6. The method according to claim 5, wherein the aluminum supplementing operation is performed under an atmosphere of inert gas.
7. 7. The method according to claim 5, wherein the acid-soluble aluminum content of the molten steel after aluminum compensation is 0.022-0.032 wt%.
8. 8. The method according to claim 5, wherein the time interval from the completion of the aluminum replenishment operation to the continuous casting is 6 to 8 minutes.
9. 9. An electrical steel produced by the method of any one of claims 1 to 8.
10. 10. The method of claim 9, wherein the electrical steel comprises oriented silicon steel, the oriented silicon steel comprising high temperature high magnetic induction oriented silicon steel and plain oriented silicon steel.

Description

Method for improving hit rate of narrow component of oriented silicon steel acid-soluble aluminum and application Technical Field The invention relates to the technical field of steel production, in particular to a method for improving hit rate of acid-soluble aluminum narrow components of oriented silicon steel and application thereof. Background The electrical steel is used as a core soft magnetic material in the power industry and the electronic industry and is mainly divided into two major categories of oriented silicon steel and non-oriented silicon steel. The oriented silicon steel has excellent magnetic properties along the rolling direction, and is widely applied to high-efficiency electrical equipment such as transformer cores and the like. The oriented silicon steel can be further subdivided into low-temperature high-magnetic induction oriented silicon steel (Hi-B) and common oriented silicon steel (CGO) according to the production process and magnetic property level. In the production of high magnetic induction oriented silicon steel (Hi-B steel) using conventional processes, i.e. with AlN as the primary inhibitor, acid soluble aluminum (Als) plays an extremely critical role. The content of Als is one of the core factors for determining the magnetic properties (iron loss and magnetic induction) and microstructure of the final product, and the action mechanism and influence are as follows, specifically, when the Als content in steel is insufficient, alN inhibition particles with sufficient quantity and proper size cannot be formed in the subsequent heat treatment process. Weakening of the inhibitor effect will result in premature, disordered abnormal growth of primary recrystallized grains during the high temperature annealing stage, making it difficult to ultimately form a single, strong gaussian texture. As a result, the magnetic induction of the final product is lowered, the iron loss is increased, and the performance requirements of high-grade Hi-B steel cannot be met. Conversely, when the Als content is too high, coarse AlN particles or AlN clusters tend to be formed. The coarse particles have poor pinning effect on grain boundary migration, and also cannot effectively inhibit the normal growth of primary recrystallized grains, so that the perfection of Gaussian texture is damaged, and the magnetic performance of the product is also deteriorated. Therefore, the content of acid-soluble aluminum (Als) in the molten steel is precisely controlled within an extremely narrow range, and the method is a precondition for realizing stable production of the oriented silicon steel with high magnetic induction and low iron loss. In actual large-scale industrial production, especially in the molten steel component adjustment link after RH vacuum treatment, the realization of the narrow component high hit rate of acid-soluble aluminum (Als) is faced with a great challenge due to the fluctuation of multiple factors such as temperature, time, alloy yield and the like. The low hit rate of Als components directly leads to large fluctuation of magnetic properties of products and low yield of high-grade products, thereby causing serious economic loss. Therefore, there is an urgent need to develop a method capable of stably controlling the acid-soluble aluminum content of molten steel to solve the bottleneck problem of low hit rate of narrow components in the industry, thereby remarkably improving the production efficiency and the product consistency of high-grade oriented silicon steel. Disclosure of Invention The invention mainly aims to provide a method for improving hit rate of acid-soluble aluminum of oriented silicon steel and application thereof, and aims to solve the technical problems that in the prior art, in a process window after RH vacuum treatment and before continuous casting, the content of acid-soluble aluminum (Als) is difficult to be quickly, accurately and stably regulated to be in a target range of 0.020-0.035 wt%, so that the fluctuation of magnetic property of oriented silicon steel (especially high magnetic induction Hi-B steel) is large, the yield of high grade is low and the production cost is high. The invention provides a method for improving hit rate of acid-soluble aluminum narrow components of oriented silicon steel, which comprises the following steps of detecting acid-soluble aluminum content of molten steel after RH vacuum treatment process is finished and before continuous casting, and if the content is lower than 0.020wt%, supplementing aluminum into a ladle to adjust the acid-soluble aluminum content to be within a range of 0.020-0.035 wt%. 1. Under the above conditions, the accurate regulation and control of the acid-soluble aluminum content of molten steel are realized by detecting and timely supplementing aluminum after RH treatment. The content of the acid-soluble aluminum is controlled within an optimized narrow interval of 0.020-0.035 wt%, so that the hit rate of the comp