A kind of billet anti-oxidation coating and spraying method thereof

An anti-oxidation coating and casting slab technology, which is applied in the field of casting slab anti-oxidation coating and spraying of casting slab anti-oxidation coating at high temperature, can solve the problems of unstable use effect, poor anti-oxidation effect, and low economic benefit, and achieve Improve the effect of use, inhibit diffusion, and prevent corrosion

Active Publication Date: 2018-08-10
沈阳东大高温材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) Poor antioxidant effect
The current anti-oxidation coating can only reduce the oxidation burning loss of steel by about 30%, and its yield can only increase by about 0.3%, and its anti-oxidation effect is not obvious
[0008] (3) The effect of use is unstable
Due to differences in steel types, pouring processes and conditions of use, the anti-oxidation effects of current anti-oxidation coatings are quite different, and the use effect is unstable, which is also the most unacceptable problem for iron and steel enterprises.
[0009] (4) Low economic benefit
After deducting the paint cost and related expenses, the economic benefit is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This example is a comparative example, which is a commonly used anti-oxidation coating and method.

[0024] The ratio of selected coatings is calculated by weight %: 30% Al 2 o 3 , 65% clay, 5% anhydrous water glass, add water to make a slurry for spraying. It is sprayed at room temperature, the steel type is welding wire steel, and the amount of slurry sprayed is 0.65kg / m 2 , the heating temperature is 1200°C, the holding time is 75 minutes, the yield of the slab is 98.05%, and the rest is oxidized burning and corrosion damage.

Embodiment 2

[0026] Use 30%Si 3 N 4 , 8% Fe, 30% Al 2 o 3 , 32% SiO 2 The composition of the anti-oxidation coating is processed and ground into a powder; the steel billet is also used to spray the paint on the billet at a temperature of 800°C by using a spray gun through the powder electrostatic spraying method, and the spraying amount is 0.65 kg / m 2 , and then heated in the furnace, the heating temperature is 1200 ° C, and the holding time is 75 minutes; the yield of the cast slab after rolling is 99.59%.

[0027] Through physical and chemical testing, the anti-oxidation coating of this embodiment melts and spreads at high temperature, forming a complete and dense double-layer protective film, and the cast slab produces very little iron oxide scale during the heating process, which is better than the conventional anti-oxidation coating and its spray coating. The yield of cast slab produced by the method is increased by 1.54%.

Embodiment 3

[0029] Choose 45% SiC, 10% Fe, 20% MgO, 25% SiO 2 The composition of the anti-oxidation coating is processed and ground into powder; the alloy steel billet is used, and the paint is sprayed on the billet at a temperature of 500 °C by using a spray gun through the powder electrostatic spraying method, and the spraying amount is 0.65kg / m 2 , and then heated in the furnace, the heating temperature is 1150 ° C, and the holding time is 75 minutes; the yield of the cast slab after rolling is 99.69%.

[0030] Through physical and chemical testing, the paint melted and spread at high temperature forms a complete and dense protective film, and the slab has less iron oxide scale, which increases the yield of the slab by 1.64%.

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PUM

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Abstract

The invention discloses a casting blank oxidation resisting coating and a spraying method thereof. The casting blank oxidation resisting coating is characterized in that the casting blank oxidation resisting coating is composed of main components including silicon nitride or silicon carbide or silicon nitride plus silicon carbide and iron, and other components including one or more of Al2O3, SiO2, MgO and Cr2O3; the oxidation resisting coating is sprayed at high temperature in a powder electrostatic mode, a double-layer protection structure for a low melting point glass phase and a ceramic phase is formed on the surface of a casting blank in the heating process, oxidation of the casting blank by burner gas and corrosion of the casting blank by the low melting point glass phase can be effectively restrained, and the steel yield is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of anti-oxidation coatings, in particular to a casting slab anti-oxidation coating and a method for spraying the casting slab anti-oxidation coating at high temperature. Background technique [0002] Usually the billet or ingot is heated or soaked in a heating furnace before rolling. The heating temperature is 1000°C to 1200°C according to the steel type and rolling process, and the heating time is generally controlled between 1 and 5 hours. During the heating process, the surface of the slab reacts with the oxygen in the furnace gas to produce a large amount of oxide scale, which significantly reduces the yield of steel. According to statistics, every heating time, the oxidation burning loss caused by the surface oxidation of the slab is about 1.2% on average, and the highest can reach 2.0%. In the machinery industry, this oxidation burning loss is as high as about 5%. [0003] Oxidation of billets will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/70
Inventor 于景坤
Owner 沈阳东大高温材料有限公司
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