CN108822590B - High-temperature protective coating for steel hot rolling process and preparation method thereof - Google Patents
High-temperature protective coating for steel hot rolling process and preparation method thereof Download PDFInfo
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- CN108822590B CN108822590B CN201810783364.XA CN201810783364A CN108822590B CN 108822590 B CN108822590 B CN 108822590B CN 201810783364 A CN201810783364 A CN 201810783364A CN 108822590 B CN108822590 B CN 108822590B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/45—Anti-settling agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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Abstract
The invention belongs to the technical field of coatings, and provides a high-temperature protective coating for a steel hot rolling process and a preparation method thereof. The paint is prepared from water, inorganic oxide powder and a dispersing agent, and comprises the following components in parts by weight: 30-50 parts of quartz powder, 8-15 parts of zircon sand, 6-9 parts of boehmite or diaspore, 5-9 parts of magnesium oxide whisker, 0-4 parts of boron carbide powder, 3-6 parts of silicon carbide powder, 15-25 parts of low-melting-point glass powder, 0.3-0.5 part of hydroxyethyl cellulose and water. Grinding and mixing the raw materials to obtain the high-temperature protective coating. The invention is suitable for continuous line spraying, has good uniformity and is not easy to block a nozzle, and can be spread to form a compact protective layer after being sprayed on a high-temperature billet, so that the protection failure does not occur in a furnace, and the billet can be peeled off automatically after being taken out of the furnace; meanwhile, the process is simple, the use is convenient, and the method is suitable for practical popularization and application.
Description
Technical Field
The invention belongs to the technical field of coatings, and relates to a high-temperature protective coating for a steel hot rolling process and a preparation method thereof.
Background
Soaking or heating for 2-3 hours in a heating furnace at a certain temperature before rolling steel ingots, continuous casting billets, primary rolling billets and the like. In the process, the surface of the steel part reacts with oxidizing components in the atmosphere at high temperature to generate a surface oxidation layer, so that the oxidation burning loss of the steel part is caused. For medium and high carbon steel, the surface cementite is depleted, so that the mechanical properties cannot reach the standard. Meanwhile, the scale generated on the surface of the billet is usually very difficult to remove, which not only wastes time and labor, but also causes serious surface defects because the residual oxide is pressed into the surface of the steel strip during rolling.
In order to reduce the loss caused by the above-mentioned heating oxidation of steel, methods such as vacuum heating, salt bath heating, rapid heating process and high-temperature protective coating have been developed to reduce the oxidation burning loss of steel during heating, wherein the high-temperature protective coating method is most widely used because of its advantages of small equipment investment and simple operation.
Since the end of the 80 s, domestic iron and steel enterprises and related scientific research institutions began to invest in research in this area, and many related works have been reported at present. For example, Chinese patent ZL200910210384.9 reports that SiO is used as a raw material2、Al2O3And MgO powder as main material, and adding carbon-containing reductant and other assistant; chinese patent ZL200910273227.2 reports using SiO2、Al2O3And chromium-containing powder as main component and small amount of MgO or ZrO added2And similar formulations of adhesives; chinese patent ZL201110434766.7 discloses a composite formula which takes glass powder and boron nitride as inorganic main materials and silicon resin as organic main materials; chinese patent ZL201510261278.9 discloses the use of SiO2、Al2O3、Cr2O3And blast furnace granulated slag as main material, and small amount of sodium hexametaphosphate and cellulose as high temperature protecting paint for steel billet.
The disclosed technology is applied to cold steel billets in a spraying or even brushing mode, but at present, large-scale steel enterprises almost adopt a continuous casting and rolling process, the steel billets are cooled off-line, and the production efficiency is greatly influenced on a continuous line in a mode of coating and then re-on-line, so that the practical operability is not realized. Therefore, a coating suitable for application in the modern steel industry must have the ability to be quickly sprayed on hot slabs (>600 ℃) and spread on the hot red slabs to form a film, and thus, has practical value for industrialization.
Among the technical solutions disclosed so far, there are few solutions that are said to have the capability of on-line spraying hot steel blanks. For example, Chinese patent ZL200610076257.0 and its articles (Weilianhui, Liupeng, Wangjianchang, etc..) preparation of inorganic composite binder for high-temperature spraying in billet anti-oxidation coating material [ J]The paint industry, 2007,37(11): 4-7) discloses a preparation method of a high-temperature common low-carbon steel anti-oxidation paint capable of being sprayed on line, which is prepared from SiO2、Al2O3、Cr2O3MgO and ZrO2Is used as main filming agent and is mixed with carbon-containing reductant and inorganic adhesive. The inorganic binder is synthesized by phosphoric acid, aluminum hydroxide, aluminum tripolyphosphate and ammonia water through a specific process, and has the capability of spraying and adhering to a 800 ℃ steel plate. Chinese patent 201110300650.4 discloses a method for producing thin-strip casting anti-oxidation iron sheet, the coating used is SiO2Mainly, adding Al2O3The coating is prepared by auxiliary film-forming materials such as CaO, MgO and the like and a binder, and can be used for online spraying of the high-temperature casting belt and formation of a coating. Chinese patent 201410400002.X discloses a high-carbon steel billet high-temperature protective coating, which takes corundum carbon-free waste brick material, electrofused mullite, zirconium corundum waste brick material and the like as main materials, uses dextrin and sodium lignosulfonate as a solid composite bonding agent, and uses alumina sol, silica sol and liquid aluminum dihydrogen phosphate as a liquid composite bonding agent to realize the online spraying of high-temperature steel billets.
However, these high-temperature oxidation-preventing coatings still have some problems, for example, the coating is prone to cracking, shrinkage and the like during high-temperature spraying, so that the oxidation-preventing function of the coating is ineffective.
Disclosure of Invention
In view of the technical problems in the prior art, the invention aims to provide a high-temperature protective coating for a steel hot rolling process, which is suitable for continuous line spraying, has good uniformity and difficult nozzle blockage, can be spread to form a compact protective layer after being sprayed on a high-temperature billet, does not generate protection failure in a furnace, and can automatically peel off after being taken out of the furnace; meanwhile, the process is simple, the use is convenient, and the method is suitable for practical popularization and application.
In order to achieve the performance goal, the technical scheme adopted by the invention is as follows.
The invention provides a high-temperature protective coating for a steel hot rolling process, which is prepared from water, inorganic oxide powder and a dispersing agent, wherein the high-temperature protective coating comprises the following components in parts by weight:
30-50 parts of quartz powder, 8-15 parts of zircon sand, 6-9 parts of boehmite or diaspore, 5-9 parts of magnesium oxide whisker, 0-4 parts of boron carbide powder, 3-6 parts of silicon carbide powder, 15-25 parts of low-melting-point glass powder, 0.3-0.5 part of hydroxyethyl cellulose and water.
Further, the particle sizes of the boron carbide powder, the silicon carbide powder and the low-melting-point glass powder are 200-500 meshes;
further, the low-melting-point glass powder is lead-free glass powder with a melting point of 500-600 ℃.
The invention also provides a preparation method of the high-temperature protective coating, which comprises the following steps:
1) grinding quartz powder, zircon sand, boehmite or diaspore to 200-400 meshes according to a feeding ratio, and sieving by a 200-mesh sieve;
2) stirring and mixing the undersize product, boron carbide powder, silicon carbide powder and low-melting-point glass powder for 1-2 hours until the mixture is uniform;
3) water was injected into the above mixed powder with stirring until the slurry density was 1.1 × 103kg/m3～1.5×103kg/m3To (c) to (d);
4) and adding the magnesium oxide whiskers into the slurry under stirring, stirring for 30min, then adding the hydroxyethyl cellulose, and stirring for 30min to be uniform to obtain the high-temperature protective coating for the steel hot rolling process.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1) the invention takes silicon oxide and aluminum oxide as main film forming components, forms a glass melt film after heating, isolates the billet from contacting with the atmosphere, and achieves the purpose of preventing the billet from oxidation and decarburization. By adjusting the proportion of the components, the thermal expansion coefficient and the surface tension of the molten film are controlled within a reasonable range, the molten film can be automatically spread and covered after being sprayed to the surface of the billet, and the possibility of failure in a coating furnace is avoided. In addition, zirconia is added into the coating to improve the barrier property at high temperature, and silicon carbide and boron carbide are added to capture the oxide on the surface of the billet and trace oxygen penetrating through the coating, prevent the billet from decarbonization and further improve the protective effect of the coating. Through the combined action of the above principles, the effective protection temperature of the coating can reach more than 1300 ℃, and the coating is suitable for practical use in production.
2) In order to meet the requirement of on-line spraying of high-temperature steel billets, the low-melting-point glass powder is used as the binder of the coating, and the low-melting-point glass powder is quickly liquefied and spread before the main film forming component is melted, so that the coating is uniformly attached to the surface of the steel billets to form a molten film in the stokehole stage, and meanwhile, the particle size of the material is adjusted, so that the inorganic material can be quickly melted without reducing the oxygen barrier effect. After the binder is added, the coating can realize on-line spraying on hot steel billets at 500-1000 ℃.
3) Besides the main film forming component, the coating also contains high-melting-point magnesium oxide whiskers so as to improve the dimensional stability of the coating at the initial stage after on-line spraying, improve the viscosity and toughness of a liquid film layer in a furnace and prevent the film layer from losing efficacy such as cracking, shrinkage cavity and the like. After the coating is taken out of the furnace and cooled, the coating can be normally crushed and automatically fall off because the toughening effect is lost due to higher shrinkage rate of the crystal whiskers. Meanwhile, the addition of the fibrous material greatly slows down the sedimentation rate of particles in the coating, and further improves the storage stability of the coating.
4) The high-temperature protective coating can be produced by simply crushing and mixing mineral raw materials, does not need to adopt common melt mixing or complex water-phase chemical reaction in the traditional technology to prepare a binder, and is simple and convenient to produce.
5) The high-temperature protective coating does not contain elements such as chromium, lead and the like with toxicity and environmental harmfulness, and meets the requirement of environmental protection.
Detailed Description
The technical solution and the technical effect of the present invention will be described below with reference to specific examples. Unless otherwise specified, the technical means used in the present invention are well known to those skilled in the art. In addition, the embodiments are to be construed as illustrative and not limiting the scope of the invention.
Example 1:
the preparation method of the high-temperature protective coating for the steel hot rolling process comprises the following steps:
1) grinding 45 parts of quartz powder, 13 parts of zircon sand and 8 parts of boehmite to 200-400 meshes, and sieving with a 200-mesh sieve;
2) throwing the undersize into a ribbon mixer, adding 2 parts of boron carbide powder, 5 parts of silicon carbide powder and 19 parts of silicon-boron-bismuth type low-melting-point glass powder, and stirring and mixing for 1 hour until the mixture is uniform;
3) water was injected into the above mixed powder with stirring until the slurry density reached about 1.3 × 103kg/m3Stopping the operation;
4) and adding 9 parts of magnesium oxide whiskers into the slurry under stirring, stirring for 30min, then adding 0.3 part of hydroxyethyl cellulose, and stirring for 30min to be uniform, thus obtaining the high-temperature protective coating.
Example 2:
the preparation method of the high-temperature protective coating for the steel hot rolling process comprises the following steps:
1) grinding 43 parts of quartz powder, 12 parts of zircon sand and 8 parts of boehmite to 200-400 meshes, and sieving with a 200-mesh sieve;
2) throwing the undersize into a ribbon mixer, adding 2 parts of boron carbide powder, 5 parts of silicon carbide powder and 25 parts of silicon-boron-bismuth type low-melting-point glass powder, and stirring and mixing for 1 hour until the mixture is uniform;
3) water was injected into the above mixed powder with stirring until the slurry density reached about 1.4 × 103kg/m3Stopping the operation;
4) and adding 5 parts of magnesium oxide whiskers into the slurry under stirring, stirring for 30min, then adding 0.4 part of hydroxyethyl cellulose, and stirring for 30min to be uniform, thus obtaining the high-temperature protective coating.
Example 3:
the preparation method of the high-temperature protective coating for the steel hot rolling process comprises the following steps:
1) grinding 49 parts of quartz powder, 13 parts of zircon sand and 8 parts of hard diaspore to 200-400 meshes, and sieving with a 200-mesh sieve;
2) throwing the undersize materials into a ribbon mixer, adding 5 parts of silicon carbide powder and 15 parts of boron-bismuth-zinc type low-melting-point glass powder, and stirring and mixing for 1 hour until the mixture is uniform;
3) water was injected into the above mixed powder with stirring until the slurry density reached about 1.3 × 103kg/m3Stopping the operation;
4) and adding 9 parts of magnesium oxide whiskers into the slurry under stirring, stirring for 30min, then adding 0.3 part of hydroxyethyl cellulose, and stirring for 30min to be uniform, thus obtaining the high-temperature protective coating.
Example 4:
the preparation method of the high-temperature protective coating for the steel hot rolling process comprises the following steps:
1) grinding 47 parts of quartz powder, 13 parts of zircon sand and 8 parts of boehmite to 200-400 meshes, and sieving with a 200-mesh sieve;
2) throwing the undersize into a ribbon mixer, adding 5 parts of silicon carbide powder and 18 parts of aluminum-boron-silicon type low-melting-point glass powder, and stirring and mixing for 1 hour until the mixture is uniform;
3) water was injected into the above mixed powder with stirring until the slurry density reached about 1.3 × 103kg/m3Stopping the operation;
4) and adding 9 parts of magnesium oxide whiskers into the slurry under stirring, stirring for 30min, then adding 0.3 part of hydroxyethyl cellulose, and stirring for 30min to be uniform, thus obtaining the high-temperature protective coating.
Example 5:
the preparation method of the high-temperature protective coating for the steel hot rolling process comprises the following steps:
1) grinding 30 parts of quartz powder, 8 parts of zircon sand and 6 parts of boehmite to 200-400 meshes, and sieving with a 200-mesh sieve;
2) throwing the undersize into a ribbon mixer, adding 3 parts of silicon carbide powder and 18 parts of aluminum-boron-silicon type low-melting-point glass powder, and stirring and mixing for 1 hour until the mixture is uniform;
3) water was injected into the above mixed powder with stirring until the slurry density reached about 1.1 × 103kg/m3Stopping the operation;
4) and adding 5 parts of magnesium oxide whiskers into the slurry under stirring, stirring for 30min, then adding 0.3 part of hydroxyethyl cellulose, and stirring for 30min to be uniform, thus obtaining the high-temperature protective coating.
Example 6:
the preparation method of the high-temperature protective coating for the steel hot rolling process comprises the following steps:
1) grinding 50 parts of quartz powder, 15 parts of zircon sand and 9 parts of boehmite to 200-400 meshes, and sieving with a 200-mesh sieve;
2) throwing the undersize into a ribbon mixer, adding 4 parts of boron carbide powder, 6 parts of silicon carbide powder and 18 parts of aluminum-boron-silicon type low-melting-point glass powder, and stirring and mixing for 2 hours until the mixture is uniform;
3) water was injected into the above mixed powder with stirring until the slurry density reached about 1.5 × 103kg/m3Stopping the operation;
4) and adding 7 parts of magnesium oxide whiskers into the slurry under stirring, stirring for 30min, then adding 0.5 part of hydroxyethyl cellulose, and stirring for 30min to be uniform, thus obtaining the high-temperature protective coating.
Claims (3)
1. The high-temperature protective coating for the steel hot rolling process is characterized by being prepared from water, inorganic oxide powder and a dispersing agent, and comprising the following components in parts by weight:
30-50 parts of quartz powder, 8-15 parts of zircon sand, 6-9 parts of boehmite or diaspore, 5-9 parts of magnesium oxide whisker, 0-4 parts of boron carbide powder, 3-6 parts of silicon carbide powder, 15-25 parts of low-melting-point glass powder, 0.3-0.5 part of hydroxyethyl cellulose and water;
wherein, the particle diameters of the boron carbide powder, the silicon carbide powder and the low-melting-point glass powder are 200-500 meshes.
2. The high-temperature protective coating as claimed in claim 1, wherein the low-melting-point glass powder is a lead-free glass powder with a melting point of 500-600 ℃.
3. A method for preparing the high-temperature protective coating for the hot rolling process of steel as claimed in claim 1 or 2, which comprises the following steps:
1) grinding quartz powder, zircon sand, boehmite or diaspore to 200-400 meshes according to a feeding ratio, and sieving by a 200-mesh sieve;
2) stirring and mixing the undersize product, boron carbide powder, silicon carbide powder and low-melting-point glass powder for 1-2 hours until the mixture is uniform;
3) water was injected into the above mixed powder with stirring until the slurry density was 1.1 × 103kg/m3～1.5×103kg/m3To (c) to (d);
4) and adding the magnesium oxide whiskers into the slurry under stirring, stirring for 30min, then adding the hydroxyethyl cellulose, and stirring for 30min to be uniform to obtain the high-temperature protective coating for the steel hot rolling process.
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| CN110016634A (en) * | 2019-05-22 | 2019-07-16 | 合肥科德电力表面技术有限公司 | A kind of reduction high-temp anti-corrosion layer porosity material for arc spraying and its application |
| CN113523180B (en) * | 2021-07-13 | 2023-04-25 | 合肥仁创铸造材料有限公司 | 3D precoated sand and preparation method thereof |
| CN114874648B (en) * | 2022-03-30 | 2024-03-12 | 日照钢铁控股集团有限公司 | Surface coating agent used on basis of continuous casting and rolling production line |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3284216A (en) * | 1965-11-08 | 1966-11-08 | Albi Mfg Company Inc | Fire-retardant coating composition |
| CN104109406A (en) * | 2014-05-27 | 2014-10-22 | 中国科学院过程工程研究所 | Water-based protective coating capable of adhering to high temperature billet and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3284216A (en) * | 1965-11-08 | 1966-11-08 | Albi Mfg Company Inc | Fire-retardant coating composition |
| CN104109406A (en) * | 2014-05-27 | 2014-10-22 | 中国科学院过程工程研究所 | Water-based protective coating capable of adhering to high temperature billet and preparation method thereof |
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Effective date of registration: 20221221 Address after: 239471 East of Sankeshu Road, Mingguang Chemical Industry Concentration Zone, Chuzhou, Anhui Province, south of Blue Classics Patentee after: Anhui jiajingmei New Material Co.,Ltd. Address before: 213164 No. 33 Gehuzhong Road, Wujin District, Changzhou City, Jiangsu Province Patentee before: CHANGZHOU VOCATIONAL INSTITUTE OF ENGINEERING |
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