Antioxidation coating material of Nano silicate in use for annealing billet in series

Abstract

This invention relates to nanoscale silicate anti-oxidation coating for steel billet annealing. The coating is composed of: composite binder 20-30 wt.%, composite phosphate curing agent 8-12 wt.%, and composite aluminosilicate filler 58-72 wt.%. The coating can resist 1500 deg.C high temperature. The coating does not need any surface treatment, and can be directly sprayed onto the surface of steel billet, and cured at normal temperature for 10 min. Before annealed and hot-rolled, the coated steel billet is water-quenched for several seconds so that the coating layer is removed without any trace, and the surface quality is improved. The coating can reduce the loss-on-ignition of various steels, thus can be used for surface protection of refractory materials used as furnace kiln lining. Besides, the coating can also be used as inner and outer wall coating, and metal surface (bridge, bridge pier and dam) coating with water, corrosion and oxidation resistance.

Description

(1) Technical field [0001] The invention discloses an anti-oxidation paint, in particular to an anti-oxidation paint for solving the loss on ignition of a hot-rolled billet. (2) Background technology [0002] The defects in the existing annealing and hot rolling production technology are as follows: the loss on ignition is 3.1-3.5% for common steel billet series, carbon steel billet series and high-quality steel billet series. The loss on ignition of the special steel billet series without protection is 1.01-1.81%. After hot-rolling various steel series billets, surface quality problems such as surface cracks and patterns in different degrees of 20% to 50% occur, which restricts the improvement of surface quality. [0003] At present, the technical problems of reducing the formation of scale and surface cracks in various series of steel billets such as stainless steel and ordinary steel in hot rolling annealing have been solved. The defects of the traditional method are: 1....

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Problems solved by technology

[0003] At present, the technical problems of reducing the formation of scale and surface cracks in various series of steel billets such as stainless steel and ordinary steel in hot rolling annealing have been solved. The defects of the traditional method are: 1. The surface of the steel billet should be derusted before annealing, which is harmful to large Scale hot rolled steel industry and production volume requirements do not allow and no site

2. A certain amount of maintenance time is required, which cannot meet the production needs of the most common carbon billet series for hot rolling

3. It cannot adapt to the high temperature of 1250 °C, and the high temperature impact of about 1500 °C

[0004] After consulting the patent literature data, it is known that "anti-oxidation coating" (application number 88101985.2) can only be applied to the annealing and anti-oxidation of silicon steel slabs, and has not been pushed to the application of actual production so far; ) only shows that the temperature resistance is 800℃~1300℃, the maximum service temperature is 1500℃, and the accidents such as decarburization and steel sticking have been solved, and the reduction coefficient of loss on ignition and the actual technical effect of actual use are not reported; "pretreatment-free high-temperature anti-oxidation coating" (Application No. 93106060.5) The temperature resistance can only be used for a long time at 650 ℃ ~ 830 ℃, and the maximum use temperature is 1000 ℃, so far it has not been reported for actual use in production; medium-scale test of high-temperature anti-oxidation coatings for billets of the Institute of Process Engineering, Chinese Academy of Sciences (Science Times 2005.12.23) The literature reports only reduce the loss on ignition of ordinary steel billets to 65%, and there are no descriptions of the production and application of other stainless steel billets and special steel billets

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