Light refractory castable material for heat insulation lining of cast steel plate (CPS) furnace roller

Abstract

The invention discloses a light refractory castable material for a heat insulation lining of a cast steel plate (CPS) furnace roller. The light refractory castable material comprises the following components by weight percent: 40-50% of light mullite bone material, 5-8% of flint clay with a particle size of 0.1-1mm, 5-7% of kyanite powder, 6-9% of first-class bauxite chamotte with a particle sizeof less than or equal to 180 meshes, 7-9% of silicon micro powder, 5-8% of alpha-Al2O3 micro powder, 10-18% of bauxite cement, 1-4% of refractory fiber, 1-1.5% of spodumene, 0.05-0.154% of sodium hexametaphosphate, 0.05-0.15% of organic water reducing agent, 0.04-0.07% of organic silane coupling agent and 0.013-0.06% of defoaming agent. The refractory castable material has the characteristics of light volume weight, strong high temperature resistance, good mechanical property, good heat insulation property and excellent thermal shock stability performance.

Description

technical field [0001] The invention relates to a refractory castable used in the iron and steel smelting field, in particular to a lightweight refractory castable for CSP furnace roller heat insulation lining. Background technique [0002] CSP roller hearth type soaking furnace rollers are located in the lower part of the soaking furnace, and are supported by four rings of heat-resistant metal roller rings on the furnace rollers contacting the thin slab continuous casting slab, and through the densely distributed furnace rollers to change speed or direction to rotate, complete The conveying, buffering and storage functions of thin-slab continuous casting slabs in the furnace can meet the needs of different production rhythm arrangements. The furnace roller is an important rotating part of the CSP soaking furnace. It is not only large in number, but also works in the high temperature and harsh environment in the furnace (the temperature of the conventional CSP soaking furnac...

AI Technical Summary

Problems solved by technology

The castables of the above two patents have achieved the effect of improving the cracking and peeling of the casting layer to a certain extent, but there are still deficiencies such as high thermal conductivity and poor thermal insulation performance.

They all use steel fibers to strengthen the overall casting method of lightweight refractory castables, but the effective temperature range of commonly used GB310 refractory steel fibers is from room temperature to 1100 °C, while the temperature of CSP soaking furnace is generally 1100-1250 °C. When heating silicon steel The temperature is 1300°C. For the heat insulation lining of the furnace roller that has been in the high-temperature flue gas and strong vibration environment in the CSP soaking furnace for a long time, the use of steel fibers not only reduces the heat insulation performance of the lightweight refractory cast lining, but also due to the lightweight refractory cast The high porosity of the lining leads to high-temperature oxidation expansion and embrittlement failure of steel fibers, and deteriorates the performance of the castable lining through the high-temperature reaction of oxidation products and refractory castables