High-absorptivity coating for resisting oxidation and decarburization of steel billet

Abstract

The invention relates to a high-absorptivity coating for resisting oxidation and decarburization of a steel billet. The coating comprises the following solid main components in percentage by weight: 20 to 25 percent of refractory clay, 10 to 15 percent of silicon micropowder, 10 to 15 percent of brown fused alumina, 8 to 10 percent of silicon carbide, 3 to 5 percent of ferric oxide, 2 to 3 percent of chromium oxide, 3 to 5 percent of hydrolyzed carboxymethylcellulose and 30 to 35 percent of high-modulus water glass. An auxiliary material of the coating is water; and the adding amount of the water meets the requirement that the volume density of the coating is controlled to be in the range of 1,600 to 1,800 kg / m<3> according to the spraying or brushing requirement. The invention also discloses a preparation method for the coating.

Description

technical field [0001] The invention relates to a steel billet anti-oxidation and anti-decarburization coating and a preparation method thereof. Background technique [0002] Before rolling, the steel billet needs to be heated in the heating furnace. During the heating process in the heating furnace, the steel billet mainly receives the radiant heat from the furnace wall and the flame. Therefore, the absorption of radiant heat on the surface of the billet determines the The heating speed, quality and fuel consumption can be improved. By increasing the heat absorption rate of the billet surface, the heating speed and heating quality can be improved, and energy consumption can be reduced at the same time. Since the billet needs to be heated to about 1200°C in a high-temperature furnace before rolling, due to the oxidizing atmosphere in the furnace, the billet at high temperature is easily oxidized, and the oxidation loss rate is generally about 1%, and some are even greater th...

AI Technical Summary

Problems solved by technology

[0004] In addition to controlling the atmosphere in the furnace, the most effective way to reduce oxidative burning loss and prevent billet decarburization is to isolate the billet from the atmosphere in the furnace; heating, because the thermal conductivity of inorganic refractory materials is much smaller than that of metal materials, in order to make up for this defect caused by the heating of the coating to the billet, in addition to the coating being thin enough, it is also necessary to strengthen the coating’s resistance to high-temperature smoke in the furnace. Air heat absorption capacity