A method of decarburization and nitriding annealing for producing low temperature high magnetic induction grain oriented silicon steel

Abstract

The invention discloses a decarburization and nitriding annealing method for producing low-temperature high-magnetic-inductivity oriented silicon steel. The method comprises the following steps: the smelting is performed; a casting blank is heated after being formed through continuous casting; the P13 / 50 value of a steel plate is detected online, and the correction value P13 / 50 thereof is calculated according to a formula; the judgment of synchronous satisfaction of the formula is performed according to P13 / 50 and the delta N content after decarburization and nitriding; and later procedures are conventionally performed. The method can adjust decarburization annealing and nitriding annealing to synchronously limit the P1.3 / 50 value of a steel coil material and the nitriding quantity delta N in reasonable range, so that the magnetic performance of a produced product with a thickness of not more than 0.30 mm can achieve excellent magnetic performance of above 1.92 T, and high-quality parent metal can be provided for preparation of high-quality nick mark products.

Description

technical field [0001] The invention relates to a method for producing high magnetic induction oriented silicon steel, in particular to a decarburization and nitriding annealing method for producing low temperature high magnetic induction oriented silicon steel. Background technique [0002] Grain-oriented silicon steel is widely used in the production and manufacture of transformer iron cores because of its excellent magnetization properties in the rolling direction. The better the magnetic performance of the oriented silicon steel sheet is, the lower the loss of the core of the manufactured transformer is, thereby reducing the consumables for the production of a transformer of a certain specification, and reducing the quality and volume of the equipment. At present, the production methods of oriented silicon steel mainly include high-temperature slab heating preparation method (slab heating temperature is higher than 1350 ℃), medium temperature slab heating temperature pre...

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Problems solved by technology

However, in the actual production process, temperature is an important factor affecting the decarburization effect of oriented silicon steel. It is difficult to adjust the furnace temperature through the feedback of online detection values, because if the temperature in the furnace environment changes too much, it will take a certain time from the change to the stability. , which is extremely detrimental to the decarburization reaction and primary grain stability

At the same time, this document does not take into account the fluctuation of different specifications and components of raw materials in the actual production process, only independently considers the influence of the primary grain size on the magnetic properties of the product after secondary recrystallization, and does not link the impact of the primary grain size and nitriding on the magnetic properties of the product

[0010] To sum up, when using the material iron loss to evaluate the interaction relationship between primary grains and inhibitors, the existing technology does not take into account the main inhibitor components added in the steelmaking process, such as Als, Mn, N, S, etc. The impact of the initial grain after carbon annealing, and the influence of the added trace elements such as Cr and P and the nitride formed on the surface after nitriding treatment on the iron loss of the material after nitriding treatment and annealing, resulting in the production of grain-oriented silicon steel. The estimation range and adjustment accuracy of key factors such as the initial grain in the process are poor

And there is no clear and specific operation method for the adjustment and matching of the initial grain and nitriding amount, which makes the magnetic properties of the product prone to fluctuations, and it is difficult to stabilize the level of high magnetic induction.

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