Separant for removing red rust from high-temperature surface of silicon-containing steel and application method of separant

Abstract

The invention relates to a separant for removing red rust from a high-temperature surface of silicon-containing steel and application of the separant. The separant comprises the following ingredientsby weight percentage: 10-30% of vermiculite powder, 1-5% of nano magnesium silicate, 1-5% of nano chromic oxide, 25-45% of mullite, 10-35% of pulverized fuel ash, 5-25% of laterite, 0.5-1% of cassavastarch and water serving as a diluent, wherein the weight of water accounts for 50-70% of total weight of the other ingredients. The separant with a particle size being less than 100 micrometers is prepared from the ingredients by a mechanical grinding and mixing method. The high-temperature oxidation separant is applicable to high-temperature protection for a silicon-containing steel billet during heating at 1000-1300 DEG C for 1-10h; the separant is sprayed on the surface of the room temperature steel billet and is 100-400 micrometers in thickness; the separant forms a glass-based protectionfilm in the process of heating up; the separant and oxidized scale on the surface of the steel billet can be completely removed by flushing with tap water or low-pressure water after the heating of the separant is finished; the red rust area on the surface of a hot rolled material is reduced; the surface quality of the rolled material is improved; and the use cost is low.

Description

technical field [0001] The invention relates to a release agent, in particular to a release agent for removing red rust on the high-temperature surface of silicon-containing steel and an application method thereof. Background technique [0002] During the heating process of the steel billet before rolling, the surface of the billet undergoes a severe oxidation reaction at high temperature, resulting in oxidation and burning, which reduces the yield of the steel. For silicon-containing steel, iron olive formed by the oxidation of silicon in the oxide scale Stone has a low melting point and strong adhesion to the substrate. High-pressure water descaling is difficult to remove. In addition, the downstream laminar water cooling process will form a large area of ​​red rust, which directly affects the surface quality of the product. It is a technical problem that plagues enterprises. Contents of the invention [0003] In order to overcome the above-mentioned deficiencies existin...

AI Technical Summary

Problems solved by technology

[0002] During the heating process of the steel billet before rolling, the surface of the billet undergoes a severe oxidation reaction at high temperature, resulting in oxidation and burning, which reduces the yield of the steel. For silicon-containing steel, iron olive formed by the oxidation of silicon in the oxide scale Stone has a low melting point and strong adhesion to the substrate. High-pressure water descaling is difficult to remove. In addition, the downstream laminar water cooling process will form a large area of ​​red rust, which directly affects the surface quality of the product. It is a technical problem that plagues enterprises.