Continuous use of functional refractories

tundish nozzle

With the development of continuous casting, the proportion of high-clean steel production increased, sliding water mouth with skateboard, long nozzle, the sink, the outlet, immersion nozzle and other flow control and blowing function of the need for a sharp increase in refractory materials. In contrast to the earlier use of imported refractory bricks and other imported bricks of different circumstances, continuous casting refractory materials are still dominated by domestic production of products.

Sliding with a skateboard, the main use of aluminum carbon, and later, due to improved material, the use of improved conditions, greatly improved the number of durable. Material, due to the addition of zirconia, peeling resistance greatly improved. According to the experimental and stress calculation, the shape of the skateboard is improved, which inhibits the generation and expansion of the crack. Due to the miniaturization of the skateboard and the re-use of the rear skateboard, the consumption of the refractory suppliers material is reduced, so that the iron making is propelled. On the other hand, the development of high-corrosive steel slabs such as Ca-treated steel and high-carbon steels has been developed. For example, an aluminum-magnesium carbon alkaline skateboard having both corrosion resistance and peeling resistance has been developed.

Long water tundish nozzle is the most recent 10 years to improve the maximum refractory material, recently, long water mouth life can reach 30 furnace or 40 furnace is not surprising. Preheating, insulation and residue cleaning and other aspects of the use of improvements, for the extension of life has a significant effect. Material, to take to strengthen the strength of the bowl material, inhibit the inner tube steel wear, to prevent external oxidation and to prevent peeling and other measures.

Immersion nozzle, its characteristics and the flow pattern within the mold and the relationship between the quality of slab larger, it is generally from the material and shape of the two aspects of development and improvement. Material development is representative of the nozzle inside the alumina difficult to adhere to the development of materials. Generally use ZrO2-CaO-C material, the recent widespread use of carbon-free lining. Shape of the development, there are ladder-type immersion nozzle, this nozzle can effectively prevent the bias current, reduce the nozzle inside the alumina adhesion. In addition, a scheme for the use of a swirling flow nozzle and a vortex flow nozzle with spherical protrusions is proposed, and a furnace test is underway.

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