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Continuous casting slab high-temperature oxidation resistant coatings and preparation process thereof

An anti-oxidation coating and preparation process technology, applied in coatings and other directions, can solve the problems of unsuitable industrial production and promotion, many additives, and high cost of coatings, and prevent oxidation and decarburization, as well as the loss and natural peeling of alloying elements. The effect of enhanced capacity and low cost

Inactive Publication Date: 2011-07-20
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this coating has certain high temperature resistance, oxidation resistance and thermal stability, the cost of the coating is too high, the process is complicated, the additives are too many, it is not easy to mix, and it is not suitable for industrial production and promotion.
[0006] Although the above-mentioned coatings have good high-temperature anti-oxidation effects on the specified billet to a certain extent, most of these coatings are limited to normal temperature coating, drying, film formation and static high-temperature protection, which limits the promotion of such achievements

Method used

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  • Continuous casting slab high-temperature oxidation resistant coatings and preparation process thereof
  • Continuous casting slab high-temperature oxidation resistant coatings and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take zircon, mica, albite, wollastonite, vermiculite, carbon powder, etc. according to the dry powder chemical composition: 3% ZrO 2 , 12% Al 2 O 3 , 40% SiO 2 , 15% MgO, 12% CaO, 3% Fe 2 O 3 , 5% C, 5% Na 2 O, 5% ZnO are respectively ground to below 120 mesh, the materials are mixed, the mixed binder is added and the density of the final coating slurry is adjusted to 1200kg / m 3 , Obtain the continuous casting slab high-temperature anti-oxidation coating I of the present invention. Spray the coating on the surface of the Q345B cast billet at 800°C to form a gray-white protective coating. After heat treatment, the iron oxide scale protected by the coating is significantly thinner than the iron oxide scale not protected by the coating, and the oxidation burn loss rate is reduced by more than 60%, and the coating can peel off naturally, and the surface of the substrate is uniform and smooth after peeling, and there is no residue .

Embodiment 2

[0031] Take zircon, mica, albite, wollastonite, vermiculite, borax, carbon powder, etc. according to the dry powder chemical composition: 4% ZrO 2 , 11% Al 2 O 3 , 30% SiO 2 , 15% MgO, 12% CaO, 3% Fe 2 O 3 , 4%B 2 O 3 , 10% C, 6% Na 2 O, 5% ZnO were ground to below 120 mesh, the materials were mixed, the mixed binder was added and adjusted with water until the density of the final coating slurry was 1300kg / m 3 , Obtain the continuous casting slab high temperature anti-oxidation coating II of the present invention. Spray the coating on the surface of SS400 cast slab at 1000°C to form a gray-white protective coating. After heat treatment, the iron oxide scale protected by the coating is obviously thinner than the iron oxide scale not protected by the coating, and the oxidation burn rate is reduced by more than 70%, and the coating can peel off naturally, and the surface of the substrate is uniform and smooth after peeling, and there is no residue. .

Embodiment 3

[0033] Take zircon, mica, potash feldspar, emery, talc powder, carbon powder, etc. according to the dry powder chemical composition: 3% ZrO 2 , 13% Al 2 O 3 , 44% SiO 2 , 12% MgO, 13% CaO, 2% ZnO, 7% C, 3% Na 2 O, 3% K 2 Grind O separately to below 120 meshes, mix the materials, add the mixed binder and adjust with water until the density of the final coating slurry is 1200kg / m 3 , Obtain the continuous casting slab high temperature anti-oxidation coating III of the present invention. Spray the coating on the surface of the Q345B cast billet at 900°C to form a gray-white protective coating. After heat treatment, the iron oxide scale protected by the coating is obviously thinner than the iron oxide scale not protected by the coating, and the oxidation burn rate is reduced by more than 70%, and the coating can peel off naturally, and the surface of the substrate is uniform and smooth after peeling, and there is no residue. .

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Abstract

The invention relates to a preparation process of continuous casting slab high-temperature oxidation resistant coatings, which is characterized in that less than 120 meshes of powder, reductant containing carbon, inorganic binders, surfactants, suspending agents and the like with the compositions such as 25-55 wt% SiO2, 10-20 wt% Al203, 11-23 wt% MgO and the like are respectively grinded and mixed evenly, then water is used to be mixed and stirred sufficiently evenly, and finally the density of the coatings are adjusted within 1200-1500 kg / m3. The coatings can not only be sprayed onto continuous casting slabs at normal temperature, but also be sprayed onto high-temperature casting slabs, form continuous whole protective coating layers under the action of high temperature, effectively reduce temperature drop of the casting slabs and oxidation burning loss in even heating process of a heating furnace without changing original performance of matrixes, and effectively decrease dilution ofalloying elements on the surfaces of the casting slabs. After the casting slabs are out of the heating furnace, natural spalling capability of the coating layers is strong, and oxidation matrixes of the casting slabs are smooth. Raw materials of the oxidation resistant coatings are easy to be obtained, and the coatings have low cost and simple preparation process and are adaptable to oxidation resistance for various steels when being heated at 700-1300 DEG C / 2-8 hours.

Description

Technical field [0001] The invention belongs to the field of coatings, and specifically relates to a high-temperature anti-oxidation coating for continuous casting slabs and a preparation process thereof. Background technique [0002] Energy saving and emission reduction is the goal pursued by all industries in the world, especially for steel companies with higher energy consumption. The continuous casting slab needs to undergo a heating process at a high temperature of about 1200°C and a long time in a heating furnace before hot rolling. This process makes the surface of the casting slab very severely burned by oxidation, with an oxidation burnout rate of 0.5 to 2.5%. In order to reduce the oxidative burning loss of the cast slab and reduce the surface temperature drop during the conveying process, the surface of the high-temperature cast slab is brushed with anti-oxidation coatings to reduce the temperature drop of the cast slab and increase the yield rate and improve the quali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C21D1/68
Inventor 米振莉王岩左碧强赵征志苏岚陈银莉赵爱民唐荻孙蓟泉
Owner UNIV OF SCI & TECH BEIJING
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