PAINT FOR PREVENTING HIGH-TEMPERATURE DECARBURIZATION OF CARBON STEEL

PURPOSE:To prevent carbon steel products from being decarburized and oxidized at a high temp. by applying the paint mixed with SiC powder, water soluble silica sol or alumina sol, and a mixture composed of a water soluble resin having a caking property and emulsion resin or further specific ceramics powder on the surface of the carbon steel products. CONSTITUTION:The surface layers of the members made of carbon steel are decarburized and are further oxidized by reacting with the oxygen in the air at the time of heating the members by various heat treatments to a high temp of, for example, >=1000 deg.C. The paint added with 100 pts.wt. SiC powder, 1 to 300 pts.wt. water soluble silica sol or water soluble alumina sol or mixture composed thereof as solid content, 0.1 to 100 pts.wt. water soluble resin having the caking property, such as polyvinyl alcohol or acrylic resin, emulsion resin or mixture composed thereof or further 5 to 500 pts.wt. ceramics powder of alumina, zirconia, silica, mullite, etc., per 100 pts.wt. solid is applied on the surface layers as the paint for preventing the decarburization thereof. The steel products are prevented from being decarburized and oxidized by the heat treatment at the high temp. and the paint is easily peeled from the steel product surfaces at ordinary temp.