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A High Temperature Protective Coating for Nickel-based Alloy Steel

A high-temperature protection and alloy steel technology, applied in the direction of coating, etc., can solve the problems of difficult and difficult descaling, and achieve the effect of high-temperature protection and descaling, no environmental pollution, and enhanced compactness

Active Publication Date: 2016-06-29
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

[0006] Aiming at the problem of difficult descaling of nickel-based alloy steel in the later stage, the invention proposes a high-temperature protective coating for the heat treatment process of nickel-based alloy steel before hot rolling
The coating can effectively solve the difficult descaling problem caused by heat treatment of nickel-based alloy steel at 1200-1350 ° C. It is safe and non-toxic to use, does not affect heating, has low cost, and has no environmental pollution.

Method used

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  • A High Temperature Protective Coating for Nickel-based Alloy Steel
  • A High Temperature Protective Coating for Nickel-based Alloy Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The weight component of the coating powder is selected as Al 2 o 3 30%, SiO 2 20%, MgO20%, TiO 2 10%, CuO8%, Y 2 o 3 10%, Na 2 O1%, K 2 O1%.

[0017] When using, first mix the powder and water 2:1 to form a slurry. Add binder, binder quality accounts for 10% of slurry quality. A dispersant carboxymethyl cellulose is added, and the quality of the dispersant accounts for 1% of the mass of the slurry.

[0018] The following is a comparative test for the adhesion of 9Ni steel without coating protection and 9Ni steel oxide scale adhesion with coating protection.

[0019] The 9Ni steel was cut into samples of 10mm×10mm×10mm, annealed in a heating furnace at 700°C to remove surface oil, and taken out for later use. Put the surface-coated and non-painted samples into the muffle furnace and heat to 1300°C for one hour.

[0020] figure 1 It is 9Ni steel with coating protection, which is treated at a constant temperature of 1300 ° C for one hour to oxidize the inner la...

Embodiment 2

[0022] The weight component of the coating powder is selected as Al 2 o 3 35%, SiO 2 15%, MgO15%, TiO 2 18%, CuO8%, Y 2 o 3 7%, Na 2 O1%, K 2 O1%.

[0023] When using, first mix the powder and water 2:1 to form a slurry. Add binder, binder quality accounts for 5% of slurry quality. Add dispersant carboxymethyl cellulose, and the quality of dispersant accounts for 1.5% of the slurry quality.

[0024] The difference between this embodiment and the first embodiment is that the experimental steel type is Q690D (nickel mass fraction is about 0.8%) and the coating composition is different, and the experimental results are the same as the first embodiment.

Embodiment 3

[0026] The weight component of the coating powder is selected as Al 2 o 3 38%, SiO 2 16%, MgO12%, TiO 2 16%, CuO6%, Y 2 o 3 10%, Na 2 O1%, K 2 O1%.

[0027] When using, first mix the powder and water 2:1 to form a slurry. Add binder, binder quality accounts for 8% of slurry quality. Add dispersant carboxymethyl cellulose, and the quality of dispersant accounts for 2% of the slurry quality.

[0028] The difference between the present embodiment and the first embodiment is that the experimental steel type is 20Cr2Ni4A (nickel mass fraction is about 3.45%) and the coating composition is different, and the experimental results are the same as the first embodiment.

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Abstract

The invention relates to a high-temperature protective coating used in the heat treatment process before hot rolling of nickel-based alloy steel. The coating powder part includes the following components: Al 2 o 3 20%-40%, SiO 2 10%-30%, MgO10%-20%, TiO 2 10%-20%, CuO5%-15%, Y 2 O35%-15%, Na 2 O0%-1%, K 2 O0%-1%, where Al 2 o 3 and SiO 2 Derived from one or both of kyanite and aluminum ash; TiO 2 Originated from rutile ore. The binder in the paint is formed by mixing one or more of sodium water glass, potassium water glass, and silica sol; the dispersant is carboxymethyl cellulose. When using, first mix the powder and water in a weight ratio of 2:1 to form a slurry, add a binder, the binder accounts for 5%-10% of the slurry, add a dispersant, and the dispersant accounts for the slurry The mass ratio is 1%-2%. After mixing, ball mill to a particle size of 200-600 mesh to get the coating. It can be sprayed directly under the steel billet below 800 °C, which can effectively solve the difficult removal of nickel-based alloy steel caused by heat treatment at 1200-1350 °C. scale problem.

Description

technical field [0001] The invention relates to an inorganic water-based high-temperature-resistant coating which can be sprayed on a steel billet below 800°C and is used for slowing down the surface oxidation of nickel-based alloy steel during heating and reducing the viscosity of scale. Background technique [0002] At present, most domestic iron and steel enterprises adopt the continuous casting and rolling process and high temperature hot delivery process, and the steel will inevitably be exposed to the oxidizing atmosphere during the hot rolling process, resulting in scale. Unlike other steels, the iron oxide scale formed when nickel-based alloy steel is heated has strong adhesion. Because nickel is more difficult to oxidize than iron. In the heating furnace, iron is oxidized first when oxidation occurs, and nickel enrichment occurs in the inner layer of iron oxide scale, forming nickel-rich metal meshes and particles, which develop with the increase of temperature. S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D7/12
Inventor 魏连启何影仉小猛单欣叶树峰陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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