Submersed nozzle lining material lowering wire fracture rate in silicon killed steel processing process

Abstract

The invention discloses a submersed nozzle lining material lowering the wire fracture rate in the silicon killed steel processing process and belongs to the field of functional refractory materials for continuous casting in the ferrous metallurgy industry. The submersed nozzle lining material lowering the wire fracture rate in the silicon killed steel processing process is characterized in that the nozzle lining material does not contain aluminum oxide type particles, and the specific ingredients of the nozzle lining material include 55%-60% of magnesium oxide, 25%-30% of quartz sand, 5%-10% of graphite and 5%-10% of additional phenolic resin as a binding agent. The particle size of the magnesium oxide is 0.1-1.0mm, the particle size of the quartz sand is 0.5- 2.0mm, and the lining thickness is 5-8mm.The submersed nozzle lining material can significantly lower the high aluminum oxide inclusion in the silicon killed steel and lower the wire fracture rate of ultra-deep drawing type wirerods.

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] Common silicon-deoxidized steels include bead wires, steel cords, cutting wires and diamond wires and other ultra-deep drawing wires. Due to the strict subsequent processing of the material (including multi-pass drawing and twisting), once there are large-scale non-deformable high-alumina inclusions in the steel, the steel wire will break during the drawing or plying process, seriously affecting the steel wire. The production efficiency even causes steel wire to be scrapped. [0003] At present, the commonly used aggregates for the lining of submerged nozzles include alumina, magnesia-alumina spinel, mullite and other aluminum-containing oxides, and the matrix is ​​generally graphite. Due to the incomplete deoxidation of the silicon deoxidized steel, there is still a certain amount of disso...

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Problems solved by technology

[0004] Aiming at the problem of large-sized non-deformable high-alumina inclusions caused by melting loss and spalling of submerged nozzle refractory materials, the purpose of this invention is to propose a submerged nozzle lining material that can reduce the broken wire rate during silicon-deoxidized steel processing. The composition of the lining material is specially designed to react with molten steel under high temperature conditions to form a layer of magnesia olivine without alumina. Even if it peels off to the molten steel, it will be fully broken during the drawing process and will not cause the material to pull. Broken wires during drawing and plying

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