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  • Name: Tundish sizing nozzle gas-protection quick-change casting technology

Tundish sizing nozzle gas-protection quick-change casting technology

(Patent No.:ZL 2008 2 0176035.0)

Technical Description:

  This technology integrates continuous casting sizing nozzle quick-change technology and gas-protection technology, forming inert gas seal protection between filling and draining nozzles and between draining nozzle and immersion nozzle in the casting process, cutting off the contact between air and molten steel. In the casting production of grade steels and the continuous casting of high-quality steel, the technology can achieve the stability of casting speed of the caster, long life of tundish, and energy saving and emission reduction; in addition, it can ensure that molten steel is not oxidized in the continuous casting process to meet the technical and quality requirements of grade steels and the continuous casting of high quality steel.

  In modern continuous casting of square billets and rectangle billets, tundish sizing nozzle gas-protection quick-change casting equipment is generally adopted. This kind of equipment has many well proven advantages, especially in extending the life of tundish and improving the molten steel receiving rate, increasing productivity, reducing refractory consumption, lowering labor intensity, saving energy and reducing emission. However, in recent years, with the development of the national economic construction, and with the optimization of the structure of grade steels, the market demands for high quality steel and grade steels are increasing dramatically, and the requirements for high quality steel are also increasing. Due to the shortcomings of the traditional stopper long nozzle high-quality steel casting production process, such as, short tundish life, low productivity, and high refractory consumption, the production and development of high quality steel and grade steels are seriously impeded, while the existing tundish sizing nozzle quick-change technology is adopted. Because the air enters steel water through the spacing between draining and filling nozzles and that between draining nozzle and the immersion nozzle, which can increase the oxygen content in molten steel, and affect the billet quality, it is difficult for the old quick-change technology to meet the requirements for continuous casting production of grade steels and high quality steel. Therefore, the advantages of sizing nozzle quick-change technology, such as, extending tundish life, improving the recovery rate of molten steel, improving production efficiency, reducing refractory consumption, lowering labor intensity, saving energy and reducing emission, and so on, cannot be realized in the production of grade steel and high-quality steel. In response to the market requirements and in order to promote the progress of continuous casting technology, our company has researched and developed the “tunish sizing nozzle gas-protection casting quick-change equipment technology”.

  Before the adoption of the above technology, sizing nozzle quick-change technology is generally adopted in continuous casting of square billets and rectangle billets. Because the air enters steel water through the spacing between draining and filling nozzles and that between draining nozzle and the immersion nozzle, which can increase the oxidizing impurities and harmful gases in molten steel, and affect the billet quality, and fail to meet the requirements for producing grade steel and high-quality steel.

  The technological route of this technology lies in the quick-change mechanism, the quick-change filling and draining nozzles and the immersion nozzle protection gas channel, forming a circular inert gas seal protection between the draining and the filling nozzles and between the draining nozzle and the immersion nozzle, isolating the contact between air and the steel water, and organically combing sizing nozzle quick-change technology with gas-protection technology.

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