An anti-oxidation coating for steel and method of protecting steel from oxidation

Abstract

An anti-oxidation coating for steel is prepared by mixing Mg-containing minerals, laminated silicates, metallurgy solid wastes, commercial aluminum powders, organic thickening agents, inorganic bindings, which comprise Al2O3, SiO2, MgO, CaO, Fe2O3, C, B2O3, P2O5, Na2O, together with water. The density of the resultant coating slurry is adjusted within 1100-1500kg / m<3> by controlling the amount ofadded water. The coating can be directly sprayed onto the hot steel whose temperature is up to 1000 DEG C before its entering into hot-rolling furnaceand a continuous protection film can be formed under high temperature. Thus, the high temperature oxidation burning loss during transportation and soaking treatment of the slab before the hot-rolling can be effectively reduced without changing thoseprimary properties of steel substrate. The advantages of the anti-oxidation coating are good self-stripping property after heating, easy obtained raw materials, low cost and simple preparing process.The present anti-oxidation coating can be used widely in the anti-oxidation of various steels during 800-1300 DEG C / 2-10 hours heating.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to an anti-oxidation coating which is suitable for coating on the surface of steel during hot rolling of steel and can reduce oxidation and burning loss of steel, and a steel oxidation prevention method using the coating. Background technique [0002] Before hot rolling, steel generally needs to go through a long heating process in a heating furnace at about 1250 ° C. This process will cause serious oxidation and burning on the surface of the steel. A layer of iron oxide scale must be peeled off from the steel surface. If no protective measures are taken, the iron oxide scale will be relatively thick, and residues will easily remain on the surface of the substrate when peeled off. Usually, the burning rate of the steel during heating is as high as 0.5-2.5%. This oxidation burning loss not only reduces the yield, but also affects the surface quality of the steel. In order to redu...

AI Technical Summary

Problems solved by technology

However, this kind of coating is aimed at the high-temperature oxidation resistance of silicon steel slabs, and is not universal

[0008] It can be seen that although these anti-oxidation coatings currently used have good high-temperature anti-oxidation effects on specified steel materials to a certain extent, the protection temperature is difficult to exceed 1200 ° C, which limits the scope of their application. It is also necessary to cool down the steel before coating, which increases energy consumption

How to increase the coating temperature of the coating on the steel surface and the protection temperature of the coating layer, the current technology still needs to be improved; in addition, in order to ensure the performance of the coating, most of the current coatings use glass powder as the bonding medium. The preparation of glass powder must go through complex processing techniques such as high-temperature sintering and water quenching grinding, which adds difficulty to the early preparation process of the entire coating.

Images