Abstract

A coating method and equipment for protecting steel billets from oxidating are disclosed. The coating method is performed by feeding the steel billets(2) of 400 °C -1000 °C through a predetermined spraying zone(10), where they are sprayed with antioxidation coating composition by plural spraying devices from two or more positions, and the antioxidation coating is formed on it. The steel billets can be sprayed antioxidation coating composition when they are subjected to a treatment involving heating by the method and equipment to reduce loss from steel billets due to scaling.

IPC Classes  ?

• B05D 1/02 - Processes for applying liquids or other fluent materials performed by spraying
• B05B 1/14 - Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openingsNozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with strainers in or outside the outlet opening
• B05B 3/02 - Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
• C21D 1/68 - Temporary coatings or embedding materials applied before or during heat treatment
• C09D 1/00 - Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances

Abstract

A high temperature resistant inorganic composite adhesive and a method for preparing the same are disclosed, and the adhesive comprises aluminum hydroxide 5-12%, phosphoric acid 15-35%, rare earth oxide 0.1-1%, silica sol 5-20%, aluminum polyphosphate 1-15%, borax 1-5% and balance of water. The adhesive is used as a high temperature painting for temporarily protecting surfaces of metal components from oxidation under heat treatment at a temperature of 400 to 1000 ºC, and it maintains good adhesive property in the high temperature environment of heating furnaces, thereby decreasing oxidation loss of metal components during the heat treatment and improving the quality of material surfaces; and it can be used for high temperature furnace mending materials and refractory to enhance their strength and prolong their lifetime.

IPC Classes  ?

• C09J 1/00 - Adhesives based on inorganic constituents
• C09D 1/00 - Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
• C09D 5/08 - Anti-corrosive paints

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/m3 by controlling the amount of added water. The coating can be directly sprayed onto the hot steel whose temperature is up to 1000°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 those primary 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°C / 2-10 hours heating.

IPC Classes  ?

• C21D 1/68 - Temporary coatings or embedding materials applied before or during heat treatment
• C09D 1/00 - Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
• B05D 7/14 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies