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High-temperature protective coating for nickel base alloy steel

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

Active Publication Date: 2014-09-03
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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  • High-temperature protective coating for nickel base alloy steel
  • High-temperature protective coating for nickel base alloy steel

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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] Cut 9Ni steel into 10mm×10mm×10mm samples, anneal in a heating furnace at 700°C and remove surface oil, take it 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 layer morphology...

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 this embodiment and the first embodiment is that the experimental steel type is 20Cr2Ni4A (the mass fraction of nickel is about 3.45%) and the coating components are 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 for a hot-rolling heat pretreatment process of nickel base alloy steel. The coating powder comprises the following components: 20%-40% of Al2O3, 10%-30% of SiO2, 10%-20% of MgO, 10%-20% of TiO2, 5%-15% of CuO, 5%-15% of Y2O3, 0%-1% of Na2O and 0%-1% of K2O, wherein Al2O3 and SiO2 are from one or two of Kyanite and aluminum ash, and TiO2 is from rutile ore. A binder in the coating is mixed from one or more selected from sodium silicate, potassium silicate and silica sol, and a dispersant is carboxymethyl cellulose. For usage, the powder and water are mixed and milled into a slurry according to the weight ratio of 2:1; the slurry is added with the binder accounting for 5-10 wt.% of the slurry, and the dispersant accounting 1-2 wt.% of the slurry; the mixture is well mixed and milled to size of 200-600 mesh to obtain the coating. The coating can be directly sprayed on billet below 800 DEG C, and can effectively solve the problem of hard descaling in heat treatment of nickel base alloy at 1200-1350 DEG C.

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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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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