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High-temperature decarburization-preventing coating material used for spring steel

A coating material and anti-decarburization technology, applied in the field of high-temperature anti-decarburization coating materials, can solve the problems of increasing coating costs, environmental pollution, and limited protection effect at high temperature

Active Publication Date: 2012-05-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that the coating with graphite as the main body burns off at high temperature, the amount of remaining components is very small, and the protective effect of the high temperature section is limited
It is suitable for 800-1200℃ / 4-10 hours of heating anti-oxidation / decarburization, and can peel off after heat treatment, but this kind of coating material uses a lot of organic matter, which not only increases the cost of the coating, but also may cause toxicity. environmental pollution

Method used

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  • High-temperature decarburization-preventing coating material used for spring steel
  • High-temperature decarburization-preventing coating material used for spring steel
  • High-temperature decarburization-preventing coating material used for spring steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The weight component of the protective coating material powder is: Al 2 o 3 50%, MgO 7%, C 21%, CaO5%, SiO 2 6%, ZnO 5%, ZrO 2 2%, Y 2 o 3 2%, Na 2 O 1%, K 2 O 1%

[0020] When using, first mix the powder and water 3:1 to form a slurry. Add binder potassium water glass and sodium water glass, the quality of binder accounts for 3% of slurry quality. A dispersant is added, and the mass of the dispersant accounts for 0.5% of the total mass of the slurry to obtain the high-temperature anti-decarburization coating material of the present invention.

[0021] The following is a comparison experiment for anti-decarburization performance of spring steel without coating and spring steel adopting the coating of the present invention.

[0022] Cut the spring steel 60Si2Mn steel plate into 10mm×10mm×10mm samples, remove surface oil stains in a heating furnace at 400-500°C, then clean the residual dirt and rust on the surface with dilute hydrochloric acid solution, then ...

Embodiment 2

[0027] Select the weight component of the anti-decarburization coating material to be: Al 2 o 3 50%, MgO 8%, C 25%, CaO 3%, SiO 2 5%, ZnO 3%, ZrO 2 3%, Y 2 o 3 1.5%, Na 2 O 0.7%, K 2 O 0.8%.

[0028] When using, first mix the powder and water 3:1 to form a slurry. Add binder potassium water glass and sodium water glass, the quality of binder accounts for 7% of slurry quality. A dispersant is added, and the mass of the dispersant accounts for 0.8% of the total mass of the slurry to obtain the high-temperature anti-decarburization coating material of the present invention.

[0029] The difference between this embodiment and the first embodiment lies in that the coating material components are different, and the test results are the same as those of the first embodiment.

Embodiment 3

[0031] Select the weight component of the anti-decarburization coating material to be: Al 2 o 3 55%, MgO 3%, C 28%, CaO 5%, SiO 2 5%, ZnO 2%, ZrO 2 1%, Y 2 o 3 0.1%, Na 2 O 0.5%, K 2 O 0.4%.

[0032] When using, first mix the powder and water 3:1 to form a slurry. Add binder potassium water glass and sodium water glass, the quality of binder accounts for 15% of slurry quality. A dispersant is added, and the mass of the dispersant accounts for 1.4% of the total mass of the slurry to obtain the high-temperature anti-decarburization coating material of the present invention.

[0033] The difference between this embodiment and the first embodiment is that the steel used in the experiment is 65Mn spring steel and the composition of the coating material is different, and the test result is the same as that of the first embodiment.

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Abstract

The invention relates to a coating material used for heat treatment technology before rolling a billet of spring steel. The coating materials is directly sprayed onto the billet at the temperature below 500 DEG C and has good blocking property, a dense microcrystal glass layer is formed on the surface of the billet at a high temperature section, mutual diffusion of carbon and nitrogen can be effectively blocked; meanwhile, ingredients in the coating can obviously reduce high temperature activity of carbon atoms in steel, improve decarburization sensibility of the steel and effectively alleviate high temperature decarburization problem of the spring steel, and the dense microcrystal glass layer can naturally strip off in a subsequent cooling process. The coating can effectively prevent decarburization problem of the spring steel in a heat treatment process at the temperature of 950-1150 DEG C, self-stripping capability is high, the coating is safe and convenient to use, heating is not influenced, cost is low, and no pollution is produced.

Description

Technical field: [0001] The invention relates to a high-temperature anti-decarburization coating material for spring steel and its application, and the protection temperature range is 950°C-1150°C. In particular, it is a coating material that is sprayed on the surface of spring steel at a medium and low temperature below 500 ° C to prevent excessive decarburization of the substrate surface during high temperature heating. Background technique: [0002] Decarburization of steel materials often occurs during thermal processing. The oxidizing atmosphere in the furnace continuously interacts with the carbon in the surface layer of the metal substrate to form carbon oxides and disperse in the furnace gas, resulting in decarburization, which not only consumes metal materials, but also reduces the quality of the workpiece, affecting its performance and use life. Especially due to the loss of carbon element, the decarburized layer is softer than the matrix, easy to deform, easy to...

Claims

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Application Information

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IPC IPC(8): C21D1/70
Inventor 叶树峰王晓婧魏连启周旬刘朋陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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