High temperature common mild steel anti-oxidation coating and application thereof

Abstract

The invention relates to a high-temperature ordinary low-carbon steel anti-oxidation coating, which grinds ore powder, metallurgical waste, carbon-containing reducing agent, and inorganic binder including Al2O3, SiO2, Fe2O3, and other components to less than 100 meshes. , mix evenly, and then fully mix with water and stir evenly. The amount of water added is to finally adjust the density of the coating slurry to 1100-1500kg / m3. The coating can be directly sprayed on hot (below 1000°C) steel slabs before hot rolling into the furnace for heating, and can form a continuous protective coating under high temperature, which can effectively reduce the stress of slab transportation and soaking process before hot rolling. High-temperature oxidation burns, does not change the original properties of the billet substrate, and the coating has a strong ability to peel off naturally after heating; at the same time, the raw materials of the anti-oxidation coating are easy to obtain, the cost is low, and the preparation process is simple, which can be widely used in various steels at 800~ Anti-oxidation when heated at 1300°C / 2-10 hours.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a high-temperature common low-carbon steel anti-oxidation coating and its application. Background technique [0002] Before hot rolling, the steel billet needs to go through a long heating process in a high-temperature furnace at about 1250 ° C. This process makes the surface of the billet oxidize and burn very seriously, and the oxidation burn rate reaches 0.5-2.5%. In order to reduce the oxidation burning loss of the billet, it is usually necessary to brush the anti-oxidation coating on the surface of the billet to increase the yield and improve the quality of the steel. [0003] Chinese patent CN1632137A discloses a protective coating material to prevent oxidation / decarburization of steel workpieces during heat treatment heating, which consists of 10-20% glass powder, 33-30% quartz sand, 23-20% silica sand, 24-20% 20%Al 2 o 3 , composed of 2-10% C, the coating material is suitable f...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of low application temperature of existing coatings, resulting in energy waste, time-consuming and labor-intensive, and lack of universality, as well as the difficult pre-preparation process of raw materials in coatings, so as to provide a direct The high-temperature ordinary low-carbon steel anti-oxidation coating sprayed on the surface of the red-hot (below 1000°C) steel slab in front of the heating furnace in the hot rolling workshop. The high-temperature oxidation burning loss during the soaking process does not change the original properties of the billet substrate, and the coating has a strong ability to peel off naturally after heating; at the same time, the raw materials of the coating are easy to obtain, the cost is low, and the preparation process is simple, which can be widely used in various types of steel. Anti-oxidation when heated at 800-1300°C / 2-10 hours