An anti-oxidation coating for steel and method of protecting steel from oxidation

An anti-oxidation coating and anti-oxidation technology, used in anti-corrosion coatings, fire-retardant coatings, metal material coating processes, etc., can solve the problems of difficulty, the protection temperature is difficult to exceed 1200 ℃, increase energy consumption, etc., to reduce high-temperature oxidation burning loss , Good high temperature anti-oxidation effect, wide application temperature effect

Inactive Publication Date: 2010-06-02
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of coating is aimed at the high-temperature oxidation resistance of silicon steel slabs, and is not universal
[0008] It can be seen that although these anti-oxidation coatings currently used have good high-temperature anti-oxidation effects on specified steel materials to a certain extent, the protection temperature is difficult to exceed 1200 ° C, which limits the scope of their application. It is also necessary to cool down the steel before coating, which increases energy consumption
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  • An anti-oxidation coating for steel and method of protecting steel from oxidation
  • An anti-oxidation coating for steel and method of protecting steel from oxidation
  • An anti-oxidation coating for steel and method of protecting steel from oxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Take dolomite powder, vermiculite powder, red mud, industrial aluminum powder, borax, sodium carboxymethyl cellulose, water glass, etc. according to the chemical composition of the dry powder: 20% Al 2 o 3 , 34% SiO 2 , 21% MgO, 5% B 2 o 3 , 10% CaO, 5% Fe 2 o 3 , 2% C, 3% Na 2 O Mix the materials, grind to a particle size below 100 mesh, add water to adjust the density of the final coating slurry to 1100kg / m 3 , Obtain the high-temperature anti-oxidation coating I of the present invention.

[0052] A spraying device is installed in the front section of the heating furnace. Before the Q235-B steel enters the heating furnace, the paint is sprayed on the steel surface. The surface temperature of the steel is 800°C, which forms a layer of gray protective coating (see figure 1 ). After entering the heating furnace and heat treatment at 1250°C for 2 hours, after coming out of the furnace, it can be seen that only a thin layer of iron oxide scale is produced due to th...

Embodiment 2

[0055] Take magnesite powder, rectorite powder, red mud, industrial aluminum powder, sodium carboxymethyl cellulose, water glass, etc. according to dry powder chemical composition: 15% Al 2 o 3 , 24% SiO 2 , 33% MgO, 18% CaO, 2% Fe 2 o 3 , 3% C, 5% Na 2 O were ground separately to below 120 mesh, mixed the materials, and diluted evenly with water until the density of the final coating slurry was 1500kg / m 3 , to obtain the high-temperature anti-oxidation coating II of the present invention.

[0056] The same operation as in Example 1 was applied to the surface of GCr15SiMn steel at 1000° C. to form a layer of gray protective coating. After heat treatment at 1200°C for 2 hours, the oxide scale after coating protection is significantly thinner than that without coating protection, and the oxidation burning loss rate is reduced by more than 70%, and the coating can naturally peel off after the billet leaves the heating furnace. The surface of the substrate is uniform and smo...

Embodiment 3

[0058] Take magnesite powder, diatomite, iron oxide scale, industrial aluminum powder, polyvinyl alcohol, aluminum phosphate, etc. according to dry powder chemical composition: 25% Al 2 o 3 , 39% SiO 2 , 15% MgO, 5% P 2 o 5 , 8% CaO, 5% Fe 2 o 3 , 3% C for material mixing, powder grinding to 150 mesh, add water and stir evenly until the density of the final coating slurry is 1300kg / m 3 , to obtain the anti-oxidation coating III of the present invention.

[0059] In the same manner as in Example 1, the paint was sprayed on the surface of 20CrMnTi steel at 900°C to form a layer of gray protective coating. After heat treatment at 1280°C for 5 hours, the oxide scale after coating protection is significantly thinner than that without coating protection, and the oxidation burning loss rate is reduced by more than 50%, and the coating can naturally peel off after the steel billet leaves the heating furnace. The surface of the substrate is uniform and smooth without residue.

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Abstract

An anti-oxidation coating for steel is prepared by mixing Mg-containing minerals, laminated silicates, metallurgy solid wastes, commercial aluminum powders, organic thickening agents, inorganic bindings, which comprise Al2O3, SiO2, MgO, CaO, Fe2O3, C, B2O3, P2O5, Na2O, together with water. The density of the resultant coating slurry is adjusted within 1100-1500kg/m<3> by controlling the amount ofadded water. The coating can be directly sprayed onto the hot steel whose temperature is up to 1000 DEG C before its entering into hot-rolling furnaceand a continuous protection film can be formed under high temperature. Thus, the high temperature oxidation burning loss during transportation and soaking treatment of the slab before the hot-rolling can be effectively reduced without changing thoseprimary properties of steel substrate. The advantages of the anti-oxidation coating are good self-stripping property after heating, easy obtained raw materials, low cost and simple preparing process.The present anti-oxidation coating can be used widely in the anti-oxidation of various steels during 800-1300 DEG C / 2-10 hours heating.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to an anti-oxidation coating which is suitable for coating on the surface of steel during hot rolling of steel and can reduce oxidation and burning loss of steel, and a steel oxidation prevention method using the coating. Background technique [0002] Before hot rolling, steel generally needs to go through a long heating process in a heating furnace at about 1250 ° C. This process will cause serious oxidation and burning on the surface of the steel. A layer of iron oxide scale must be peeled off from the steel surface. If no protective measures are taken, the iron oxide scale will be relatively thick, and residues will easily remain on the surface of the substrate when peeled off. Usually, the burning rate of the steel during heating is as high as 0.5-2.5%. This oxidation burning loss not only reduces the yield, but also affects the surface quality of the steel. In order to redu...

Claims

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Application Information

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IPC IPC(8): C21D1/68C09D1/00B05D7/14
CPCC09D5/08C23C24/082C21D1/68C09D1/00B22F2998/00C23D5/02C23C26/00C23C30/00C09D5/18B22F8/00Y02P10/20
Inventor 叶树峰魏连启谢裕生陈运法邱建萍邹德军张赜邹莹坤
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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