Lightweight moisture-preserving and heat-insulating tundish cover castable and preparation method thereof

Abstract

The invention discloses a lightweight moisture-preserving heat-insulating tundish cover castable and a preparation method thereof. The additive comprises the following components in parts by mass: 30-60 parts of naturally sintered mullite, 5-20 parts of semi-heavy mullite, 5-20 parts of light mullite balls, 5-20 parts of mullite microspheres, 5-20 parts of andalusite, 2-8 parts of calcium aluminate cement, 2-8 parts of aluminum oxide micro-powder, 3-6 parts of silicon micro-powder and 0.5-3 parts of stainless steel fibers. The lightweight material configuration obviously enhances the thermal insulation property of the castable, can effectively lower the surface temperature of the tundish cover, and reduces the deformation of the steel shell and the related safety risks caused by the deformation.

Description

technical field [0001] The invention relates to the technical field of castables, in particular to a lightweight moisture-retaining and heat-insulating tundish cover castable and a preparation method thereof. Background technique [0002] The thinning of the tundish cover will cause a series of problems such as the decrease of the overall strength of the tundish cover, the increase of the deformation, and the deterioration of the thermal insulation performance. The structural strength of the cover brings hazards and affects its safety and service life. [0003] At present, ordinary high-alumina castables are generally used in the tundish covers on the market, which have poor thermal insulation performance and average strength and thermal shock stability. The thermal insulation effect is poor, which increases the energy consumption of tundish baking and increases the temperature drop of molten steel; the strength and thermal shock stability are average, resulting in easy and...

AI Technical Summary

Problems solved by technology

[0002] The thinning of the tundish cover will cause a series of problems such as the decrease of the overall strength of the tundish cover, the increase of the deformation, and the deterioration of the thermal insulation performance. The structural strength of the cover brings hazards and affects its safety and service life

[0003] At present, the tundish covers on the market generally use ordinary high-alumina castables, which have poor thermal insulation performance, average strength and thermal shock stability.

The thermal insulation effect is poor, which increases the energy consumption of tundish baking and increases the temperature drop of molten steel; the strength and thermal shock stability are average, resulting in easy and rapid damage to the castable, resulting in the steel structure being subjected to high temperature molten steel and smoke. Oxidation and ablation due to the influence of gas, the overall structural strength is reduced at high temperature, and deformation occurs under the action of stress

[0004] In the case of thinner tundish covers and increased openings in steel mills, ordinary high-alumina castables can no longer meet the requirements for use, and the service life of individual tundish covers is less than two weeks, which seriously affects the smooth flow of production

Images