High-temperature anti-oxidation coating for steel billet of plain carbon steel and preparation method of high-temperature anti-oxidation coating

Abstract

The invention relates to a high-temperature anti-oxidation coating for a steel billet of plain carbon steel and a preparation method of the high-temperature anti-oxidation coating. The technical scheme is as follows: a component A and a component B which are sub-packaged are mixed according to the mass ratio of (0.8-2):1 and are mechanically stirred when the high-temperature anti-oxidation coating is used, wherein the component A is prepared from the chemical components in percentage by mass: 20-35% of alumina powder, 20-30% of silicon dioxide powder, 15-25% of magnesia powder, 5-15% of calcium oxide powder, 5-10% of zirconium dioxide powder, 2-5% of sodium carbonate powder, 2-5% of potassium carbonate powder, 2-5% of iron oxide powder and 1-5% of aluminum powder; and the component B is prepared from the chemical components in percentage by mass: 1-5% of (CH2O)n, 4-10% of (C12H22O11)n, 5-15% of (C6H10O5)n, 0.5-2% of polyvinyl alcohol, 0.1-1% of sodium carboxymethylcellulose, 0.1-0.8% of hydroxyethyl cellulose and the balance of water. The high-temperature anti-oxidation coating has the characteristics of good anti-oxidation effect, high applicable temperature, self-falling capacity, safety, environment friendliness and low cost.

Description

technical field [0001] The invention belongs to the technical field of high-temperature anti-oxidation coatings for metal surfaces. In particular, it relates to a high-temperature anti-oxidation coating for common carbon steel billets and a preparation method thereof. Background technique [0002] In the steel rolling process, the steel billet is firstly transported to the heating furnace by means of pushing steel to be heated, and when the steel billet is heated to a predetermined temperature, it is transported to the rolling mill for rolling. For rolling ordinary billets, the temperature of the heating furnace is usually set at 1100~1300°C. At this temperature, the oxidation of the steel billet is very serious, which will have many adverse effects: [0003] 1) Oxidation burning loss accounts for about 0.8~2% of the total mass, which reduces the yield of steel production; [0004] 2) After the billet is heated and oxidized and burnt at high temperature, the surface qual...

AI Technical Summary

Problems solved by technology

[0003] 1) Oxidation burning loss accounts for about 0.8~2% of the total mass, which reduces the yield of steel production;

[0004] 2) After the billet is heated and oxidized and burnt at high temperature, the surface quality becomes poor, which not only causes serious decarburization of the billet surface and the depletion of alloy elements, but also produces a large number of surface defects during rolling, which affects the final quality of the product;

[0005] 3) When the heating furnace heats the slab, the generated iron oxide scale falls off in the furnace. If it accumulates on the bottom of the furnace for a long time, it will affect the working condition of the heating furnace. In serious cases, the furnace will be forced to stop to remove the accumulated iron oxide scale, which will affect normal production.

However, the actual application effect is not very satisfactory, and the scope of application is limited: "An anti-oxidation coating applied to the heat treatment of superalloys" (CN200910243717.08) patented technology, this technology is only applicable to the oxidation resistance of silicon steel, not applicable Oxidation resistance of ordinary carbon steel; "A high-temperature anti-oxidation coating for stainless steel and its application" (CN200810054883.9) patented technology, this technology is only applicable to the oxidation resistance of nickel-chromium stainless steel, and it is not universal; Anti-oxidation coating for heat treatment of iron and steel and its preparation method” (CN201110434766.7) patented technology, although this technology can be applied to the oxidation resistance of carbon steel or alloy steel and the service temperature is high, but Cr 2 o 3 The content is 2~5wt%, which not only greatly increases the cost of the coating, but is not suitable for the oxidation resistance of low value-added ordinary carbon steel, and the high-valence chromium ion will pollute the environment and affect human health