Low-Yang-modulus submersed nozzle lining material

Abstract

The invention discloses a low-Yang-modulus submersed nozzle lining material and belongs to the field of functional fire-resistant materials for continuous casting in the ferrous metallurgy industry. The low-Yang-modulus submersed nozzle lining material is characterized in that the Yang modulus of the nozzle lining material is lower than that of a produced steel base body, specifically, the dosingcompositions comprise 90-95% of magnesium oxide and 5-10% of phenolic resin to serve as a binding agent. The particle size of magnesium oxide is 0.1-1.0 mm, the density of magnesium oxide particles does not surpass 3.35 g / cm3, the optimal density range is 3.0-3.3 g / cm3, and the thickness of a lining is 3-8 mm. According to the material, the Yang modulus of the lining material is lower than that ofthe steel base body, the lining material can be crushed in the drawing process, and breaking of ultra-deep drawn wires due to melting loss and falling of fire-resistant materials can be reduced remarkably.

Description

technical field [0001] The invention belongs to the field of refractory materials and relates to a submerged nozzle lining material for continuous casting. Background technique [0002] Ultra-deep drawn metal products represented by bead wire, steel cord and diamond wire have extremely strict requirements on inclusions in the wire rod base material. Once there are large-sized non-deformable inclusions in the steel, the steel wire will be broken during the drawing or plying process. Frequent broken lines will seriously affect the production efficiency of the steel wire and even lead to the direct scrapping of the steel wire. The research shows that under the smelting process conditions of silicomanganese deoxidation and low-alkalinity slag refining, the melting loss and spalling of refractory materials in the submerged nozzle are the main sources of large-sized non-deformable inclusions. [0003] In order to solve the problem of introducing large size non-deformable inclusio...

AI Technical Summary

Problems solved by technology

However, the patent does not make clear requirements for magnesium carbonaceous materials

In fact, any form of submerged nozzle material cannot completely avoid melting loss and spalling during the steel pouring process

Although magnesia-carbon refractory solves the problem of aluminum-containing inclusions, it will introduce magnesium-containing inclusions. Magnesium inclusions with high Young's modulus will also lead to broken wires during wire rod drawing and plying.

[0004] As far as the current refractory aggregates are concerned, including alumina, magnesia-alumina spinel, mullite, zirconia, etc., their Young's modulus is larger than that of the steel matrix, and stress concentration will be formed during the drawing process, resulting in Therefore, it is urgent to study a low Young's modulus submerged nozzle lining material to solve the problem of submerged nozzle refractory melting loss and spalling caused by ultra-deep drawing wire broken wires

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