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...