Novel silicon steel continuous annealing furnace nitrogen-hydrogen ratio humidification device and continuous annealing decarburization method

Abstract

The invention discloses a novel silicon steel continuous annealing furnace nitrogen-hydrogen ratio humidification device and a continuous annealing decarburization method, aims to provide a humidification device, higher in system safety, capable of preventing higher furnace pressure fluctuation in a state if a switching furnace area is humidified and capable of precisely controlling the flows of dry and wet shielding gases and the hydrogen proportion, and to provide a continuous annealing decarburization process, and has stronger reference value for decarburization of non-oriented silicon steel with the carbon content of 30-50 ppm. The humidification device comprises a system high-pressure nitrogen supply TOP point, a system high-pressure hydrogen supply TOP point, a wet shielding gas premixing tank, a dry shielding gas premixing tank and a humidification tank; nitrogen and hydrogen are properly mixed through the wet shielding gas premixing tank and the dry shielding gas premixing tank, then are fed into an annealing furnace by or not by the humidification tank for introducing wet and dry shielding gases; and the hydrogen flow and the continuous annealing decarburization process are adjusted to reduce the carbon content of silicon steel finished products.

Description

technical field [0001] The invention relates to the technical field of silicon steel production, in particular to a novel silicon steel continuous annealing furnace nitrogen-hydrogen ratio humidifier and a continuous annealing decarburization method. Background technique [0002] Under the current background of fierce competition in the domestic cold-rolled non-oriented silicon steel market, low-cost, high-quality silicon steel is the goal pursued by major manufacturers. [0003] However, in the actual production process, the carbon content of cold-rolled non-oriented silicon steel is often as high as 30-50ppm due to factors such as insufficient blowing and carbon increase in the continuous casting process. Excessive carbon content will increase the coercive force of silicon steel, thereby increasing the loss of silicon steel and reducing the magnetic polarization. Therefore, for silicon steel raw material coils with a carbon content of 30-50ppm, decarburization treatment is...

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Problems solved by technology

[0003] However, in the actual production process, the carbon content of cold-rolled non-oriented silicon steel is often as high as 30-50ppm due to factors such as insufficient blowing and carbon increase in the continuous casting process.

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