A silicon-free and carbon-free corundum nozzle stopper product for continuous casting and its preparation process

Abstract

The invention discloses a silicon-free and carbon-free corundum water port stopper rod product for continuous casting. According to weight percentages of raw materials, the product consists of 60-98% of corundum, 0.5-20% of lightly-burned alumina micro powder, 1-10% of soft clay and a binding agent. A preparation process of the product comprises the following steps: according to formula proportions, taking corundum particles, the lightly-burnt alumina micro powder and the binding agent, mixing the materials uniformly, then performing forming sequentially, performing drying treatment, performing heat treatment after the drying treatment, and coating the surface of a product obtained after the heat treatment with an anti-ventilation and corrosion-resistant coating layer, thereby obtaining the water port stopper rod product. The product disclosed by the invention effectively solves the problem of high thermal expansion of a continuous casting refractory raw material used at a high temperature, has very good usability and high gas holes, and by adopting a medium-low-temperature heat treatment method, energy resources are saved.

Description

technical field [0001] The invention relates to the technical field of continuous casting refractory materials, in particular to a silicon-free and carbon-free corundum nozzle stopper product for continuous casting and a preparation process thereof. Background technique [0002] With the technological development of the steelmaking process and its high-strength, high-performance technical requirements, higher requirements are put forward for the refractory materials used in the continuous casting process. Can not cause secondary pollution to steel. [0003] At present, the main raw materials of functional nozzle stoppers for continuous casting are flake graphite, corundum, fused quartz, zirconium mullite, etc. Although flake graphite is a good refractory material, it not only has good electrical and thermal conductivity, but also has good Slag resistance and corrosion resistance of molten steel, but because the main chemical composition of flake graphite is carbon, it will ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the defects and deficiencies of the prior art, to provide a silicon-free and carbon-free corundum nozzle plug product for continuous casting and its preparation process, which can effectively solve the problem of high thermal expansion of continuous casting refractory raw materials at high temperatures. problem, has a very good performance