High-temperature surface red rust removal isolating agent for silicon-containing steel and red rust removal method

Abstract

The invention relates to the technical field of steel treatment, in particular to a high-temperature surface red rust removal isolating agent for silicon-containing steel and a red rust removal method. The high-temperature surface red rust removal isolating agent for the silicon-containing steel is prepared from dry powder and water; the dry powder adopts vermiculite powder, nano magnesium silicate, nano chromic oxide, mullite powder, coal ash, laterite and cassava starch; the water is 50 to 70 percent of the total weight of the dry powder. The high-temperature surface red rust removal isolating agent for the silicon-containing steel and the red rust removal method are applicable to protection during heating of the silicon-containing steel, and can effectively reduce loss of iron scale, suppress production of fayalite and reduce the red rust area on the downstream hot rolled surface; the adhesive force between scales and a steel matrix is lowered; after the steel is discharged out of afurnace, the scales are removed through high-pressure water, so that the scales and the isolating agent layer can completely fall off; the red rust area of the hot rolled surface is substantially reduced by 50 percent, and the product qualification ratio and the product quality are effectively improved; during production and use, the high-temperature surface red rust removal isolating agent is pollution-free to the environment, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of iron and steel treatment, in particular to a release agent for removing red rust on the high-temperature surface of silicon-containing steel and a method for removing red rust. 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. [0003] For silicon-containing steel, the fayalite formed by the oxidation of silicon in the iron oxide scale has a low melting point and strong adhesion to the substrate. It is difficult to remove the scale by high-pressure water descaling. In addition, the downstream laminar water cooling process will form a large area of ​​red rust. Affecting the surface quality of the product is a technical problem that plagues enterprises. Contents of the invention [0004] In order to overco...

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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 loss, which reduces the yield of the steel

[0003] For silicon-containing steel, the fayalite formed by the oxidation of silicon in the iron oxide scale has a low melting point and strong adhesion to the substrate. It is difficult to remove the scale by high-pressure water descaling. In addition, the downstream laminar water cooling process will form a large area of ​​red rust. It affects the surface quality of the product, which is a technical problem that plagues enterprises