Ultrathin oriented silicon steel sheet and short-process manufacturing method thereof

Abstract

The invention relates to an ultrathin oriented silicon steel sheet and a short-process manufacturing method thereof. The steel sheet comprises the following components in percentage by mass: 0.002-0.08% of C, 2.8-3.4% of Si, 0.05-0.30% of Mn, 0.015-0.04% of S, 0.005-0.05% of Als, 0.003-0.010% of N, 0-0.6% of Cu, 0-0.2% of Sn, less than 0.004% of O, less than 0.01% of P and the balance of Fe. The thickness of the product is 0.05-0.15mm. The manufacturing method comprises the following steps: (1) smelting molten steel; (2) carrying out continuous casting to obtain a casting band; (3) cooling, carrying out hot rolling and coiling; (4) carrying out normalizing treatment and controlled cooling; (5) pickling, and carrying out primary cold rolling; carrying out interannealing; (6) pickling, and carrying out secondary cold rolling; carrying out decarburizing annealing; (7) coating an annealing separant; and (8) carrying out high-temperature annealing and purification annealing. The method greatly simplifies the ultrathin oriented silicon steel sheet production process, is simple and effective, and has the characteristics of short process, high controllability and low energy consumption.

Description

technical field [0001] The invention belongs to the field of electrical steel manufacturing, and in particular relates to an ultra-thin oriented silicon steel plate and a short-flow manufacturing method thereof. Background technique [0002] Grain-oriented silicon steel (including ordinary grain-oriented silicon steel and high magnetic induction grain-oriented silicon steel) is a soft magnetic material containing about 3% silicon. Due to its strong {110}<001> Gauss texture, it has a very low Iron loss and very high magnetic induction intensity, mainly used in the manufacture of transformer cores; it is the only product in the iron and steel industry that uses the secondary recrystallization phenomenon, and is a relatively successful application of texture control technology in industrial production; by reducing the orientation The iron loss of silicon steel and saving a lot of electric energy is the goal that people pursue unremittingly. Reducing the thickness of grain...

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Problems solved by technology

[0003] However, the production of oriented silicon steel by the conventional secondary recrystallization method has a thickness limit of the finished product, which is generally about 0.15mm. When the thickness is lower than this thickness, the secondary recrystallization of the finished product is not perfect, or secondary recrystallization cannot occur. As a result, the magnetic properties are very poor, and the required service performance cannot be achieved; in order to obtain oriented silicon steel thin strips with a thickness of ≤0.15mm, people now use the three-time recrystallization production process as follows: First, use the traditional production process to obtain 0.20~0.35mm thick The secondary recrystallized oriented silicon steel is cold-rolled to a target thickness of 0.15mm or less after removing the glass film and insulating film on the surface of the finished plate, and then annealed at 750~1000°C to obtain an extremely thin strip of oriented silicon steel by triple recrystallization; the above The defects in the production process are: the thin strip is easy to crack and break during cold rolling, and the cold rolling efficiency is low; moreover, the current process needs to use the finished plate of oriented silicon steel as raw material, and the traditional production process of oriented silicon steel has many product defects. , low yield, high energy consumption, serious environmental pollution and other shortcomings

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