Method for accurately controlling Als content of high-magnetic-induction oriented silicon steel slab

Abstract

The invention discloses a method for accurately controlling the Als content of a high-magnetic-induction oriented silicon steel slab, which comprises the following steps of: quantitatively adding metal aluminum according to 0.15-0.35 kg per ton of steel when converter tapping is carried out for 20-40 seconds; after converter tapping and alloy adding, bottom blowing and uniform stirring are conducted for 3-5 min, a certain amount of metal aluminum is added, bottom blowing and uniform stirring are conducted for 3-5 min, molten steel is hoisted to RH for refining treatment, and the aluminum adding amount is controlled according to the range of [WAls target + (0.009-0.0120%)]; the molten steel is subjected to fine adjustment of components of acid-soluble aluminum for 2-3 times in the RH refining process, then refining is finished, and Als is controlled according to the target range of [WAls target + (0.0030-0.0045%)] after refining is finished; the method comprises the following steps: after a detection result of acid-soluble aluminum of a sample after RH refining is finished and before continuous casting is started, supplementing an aluminum wire into a steel ladle to enable Als in molten steel to be within a target range of [WAls target + delta casting Als loss]; argon circulation protection pouring is carried out in continuous casting, wherein the argon circulation flow is controlled to be 6-12 m < 3 > / h; and performing hot rolling and post-process production according to a normal process after a qualified plate blank is formed by pouring.

Description

Technical field [0001] The present invention belongs to the field of metallurgy, and more particularly to a method of precisely controlling high magnetic alignment silicon steel slab ALS content. Background technique [0002] Oriented silicon steel is an indispensable important soft magnetic functional material in electricity and electronics industries, mainly for manufacturing a variety of power transformers, distribution transformers and large generator stator, high magnetic, low iron loss characteristics. Due to the complex production process, the manufacturing technology is strict, the manufacturing process is long and the performance factors have been more than the "tower products" in the steel industry, and is also known as "special steel art". [0003] The inhibitor is a small dispersion second phase phase or the grain boundary gathering element, which plays a pivotable effect in the production of silicon steel. During the high temperature annealing, especially the tempera...

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Problems solved by technology

In the prior art, various measures are taken in the composition fine-tuning stage, and the control range of Als is gradually narrowed. However, since the oxidation of steel slag is accompanied until the end of pouring, the reaction between Als and oxygen in the slag during the pouring process and the protection of the molten steel during the pouring process The reaction with the air has gradually become an important factor for the precise control of Als

In the existing technology, the precise control of Als is carried out in a certain process, and the interruption of processing to wait for the analysis results, the detection of the slag sample composition, and the multiple fine-tuning of the composition all need to prolong the processing time of a certain process, which cannot meet the fast-paced and high-capacity production on site. need

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