CN111172370B - Steel billet anti-oxidation coating and preparation method and application thereof - Google Patents
Steel billet anti-oxidation coating and preparation method and application thereof Download PDFInfo
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- CN111172370B CN111172370B CN202010009104.4A CN202010009104A CN111172370B CN 111172370 B CN111172370 B CN 111172370B CN 202010009104 A CN202010009104 A CN 202010009104A CN 111172370 B CN111172370 B CN 111172370B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/72—Temporary coatings or embedding materials applied before or during heat treatment during chemical change of surfaces
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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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- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/18—Fireproof paints including high temperature resistant paints
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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
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- Chemical Treatment Of Metals (AREA)
Abstract
The invention relates to the field of steel industry, and provides a billet anti-oxidation coating and a preparation method and application thereof. The invention provides a billet anti-oxidation coating which comprises the following components in parts by weight: 55-65 parts of sodium hexafluoroaluminate; 23-33 parts of potassium oxide; 1-3 parts of boric acid; 1-3 parts of potassium fluoride; 3-13 parts of aluminum powder; 20-30 parts of alumina sol; 0.5-1.5 parts of sodium hexametaphosphate; 3-8 parts of chromic oxide; 65-75 parts of water. The anti-oxidation coating for the steel billet provided by the invention is molten in a step shape along with the rise of the temperature, so that the steel billet is always in a liquid protective environment in the temperature rise process and is not contacted with air and harmful components in the temperature rise atmosphere, and the oxidation and burning loss of the steel billet are effectively reduced. The embodiment results show that the billet anti-oxidation coating provided by the invention can effectively reduce the thickness of a scale oxidation layer and reduce burning loss.
Description
Technical Field
The invention relates to the field of steel industry, in particular to a billet anti-oxidation coating and a preparation method and application thereof.
Background
In the production process, the billet steel generally needs to be heated for the second time before being rolled. However, in the secondary heating process of the steel billet, the steel billet is affected by the high-temperature oxidation atmosphere in the heating furnace, so that iron scales and burning loss are easily generated.
At present, in order to solve the problems of scale and burning loss, the degree of oxidation of the steel billet is generally reduced by reducing the heating temperature, or adjusting the heating atmosphere, the heating time, and the like. However, the operability of the method in actual production is not strong because parameters such as heating temperature directly influence the productivity of rolled steel and further directly relate to the income of enterprises.
Disclosure of Invention
The invention provides a billet oxidation-resistant coating and a preparation method and application thereof.
The invention provides a billet anti-oxidation coating which comprises the following components in parts by mass:
preferably, the mass content of aluminum in the aluminum powder is more than or equal to 88%.
Preferably, the fineness of the aluminum powder is 700-830 meshes.
Preferably, the fineness of the sodium hexafluoroaluminate is 300-355 meshes.
Preferably, the fineness of the chromium sesquioxide is 880-1180 meshes.
The invention also provides a preparation method of the anti-oxidation coating for the steel billet, which comprises the following steps:
mixing sodium hexafluoroaluminate, potassium oxide, boric acid, potassium fluoride and aluminum powder to obtain mixed powder;
mixing the aluminum sol, sodium hexametaphosphate, chromium oxide and water to obtain a liquid mixture;
and mixing the mixed powder with the liquid mixture to obtain the billet anti-oxidation coating.
The invention also provides the application of the anti-oxidation coating for the steel billet in the technical scheme in reducing the oxidation of the steel billet.
Preferably, the application comprises the following steps: and before the billet is heated, spraying the billet anti-oxidation coating on the surface of the billet.
Preferably, the thickness of the spray coating of the billet anti-oxidation coating is 0.1-0.3 mm.
The invention provides a billet anti-oxidation coating which comprises the following components in parts by mass: 55-65 parts of sodium hexafluoroaluminate; 23-33 parts of potassium oxide; 1-3 parts of boric acid; 1-3 parts of potassium fluoride; 3-13 parts of aluminum powder; 20-30 parts of alumina sol; 0.5-1.5 parts of sodium hexametaphosphate; 3-8 parts of chromic oxide; 65-75 parts of water. The billet oxidation-resistant coating provided by the invention is molten in a ladder-shaped manner along with the rise of temperature, wherein the melting point of boric acid is about 200 ℃, the melting point of potassium oxide is about 700 ℃, the melting point of potassium fluoride is about 900 ℃, and the melting point of sodium hexafluoroaluminate is about 1000 ℃. The potassium fluoride plays a role of a catalyst, so that the melting of aluminum powder can be promoted, and the aluminum powder can constantly protect the surface of a billet in a high-temperature state; the aluminum sol plays a role in adjusting the viscosity of the coating, and is beneficial to improving the bonding strength of the billet anti-oxidation coating and the billet, so that the billet anti-oxidation coating can be firmly bonded on the surface of the billet; the sodium hexametaphosphate can fully and uniformly mix the raw materials, which is beneficial to improving the oxidation resistance and the high temperature resistance of the billet anti-oxidation coating; the chromium sesquioxide is beneficial to further improving the oxidation resistance and the high temperature resistance of the billet anti-oxidation coating. The embodiment result shows that the billet anti-oxidation coating provided by the invention can effectively reduce the thickness of the scale oxidation layer and reduce the burning loss, and the billet anti-oxidation coating can reduce the thickness of the scale oxidation layer to 0.005-0.01 mm and can greatly reduce the thickness and burning loss of the scale oxidation layer.
Detailed Description
The invention provides a billet anti-oxidation coating which comprises the following components in parts by mass:
all the raw materials in the invention are commercial products, and the purity is chemical purity and above.
The anti-oxidation coating for the steel billet comprises 55-65 parts by mass of sodium hexafluoroaluminate, preferably 58-62 parts by mass, and more preferably 60 parts by mass.
Based on the mass parts of sodium hexafluoroaluminate, the oxidation resistant coating for the steel billet provided by the invention comprises 23-33 mass parts of potassium oxide, preferably 25-30 mass parts, and more preferably 28 mass parts.
Based on the mass parts of sodium hexafluoroaluminate, the oxidation-resistant coating for the steel billet comprises 1-3 parts of boric acid, preferably 1.5-2.5 parts, and more preferably 2 parts.
Based on the mass parts of sodium hexafluoroaluminate, the oxidation resistant coating for the steel billet provided by the invention comprises 1-3 mass parts of potassium fluoride, preferably 1.5-2.5 parts, and more preferably 2 parts. In the invention, the potassium fluoride plays a role of a catalyst, can promote the melting of the aluminum powder and improve the melting speed of the aluminum powder.
Based on the mass parts of sodium hexafluoroaluminate, the anti-oxidation coating for the billet provided by the invention comprises 3-13 mass parts of aluminum powder, preferably 5-10 parts, and more preferably 8 parts. In the invention, the mass fraction of aluminum in the aluminum powder is preferably equal to or more than 88%, and the fineness of the aluminum powder is preferably 700-830 meshes, and more preferably 800 meshes. In the invention, the aluminum powder can constantly protect the surface of the billet in a high-temperature state.
Based on the mass parts of sodium hexafluoroaluminate, the anti-oxidation coating for the steel billet comprises 20-30 mass parts of alumina sol, preferably 22-28 mass parts, and more preferably 24-26 mass parts. In the invention, the fineness of the sodium hexafluoroaluminate is preferably 300-355 meshes, and more preferably 325 meshes. In the invention, the alumina sol has the function of adjusting viscosity, and is beneficial to improving the bonding strength of the billet anti-oxidation coating and the billet, so that the billet anti-oxidation coating can be firmly bonded on the surface of the billet.
The anti-oxidation coating for the steel billet comprises 0.5-1.5 parts by mass of sodium hexametaphosphate, preferably 0.8-1.2 parts by mass and more preferably 1.0 part by mass based on the mass parts of sodium hexafluoroaluminate. In the invention, the sodium hexametaphosphate enables the raw materials to be fully and uniformly mixed, thereby being beneficial to improving the oxidation resistance and the high temperature resistance of the billet anti-oxidation coating.
Based on the mass parts of sodium hexafluoroaluminate, the oxidation-resistant coating for the billet provided by the invention comprises 3-8 parts of chromium oxide, preferably 4-7 parts of chromium oxide, and more preferably 5-6 parts of chromium oxide. In the invention, the fineness of the chromium sesquioxide is preferably 880-1180 meshes, and more preferably 1000 meshes. In the invention, the chromium sesquioxide is beneficial to improving the oxidation resistance and the high temperature resistance of the billet anti-oxidation coating.
The invention also provides a preparation method of the anti-oxidation coating for the steel billet, which comprises the following steps:
mixing sodium hexafluoroaluminate, potassium oxide, boric acid, potassium fluoride and aluminum powder to obtain mixed powder;
mixing the aluminum sol, sodium hexametaphosphate, chromium oxide and water to obtain a liquid mixture;
and mixing the mixed powder with the liquid mixture to obtain the billet anti-oxidation coating.
The method is adopted to mix sodium hexafluoroaluminate, potassium oxide, boric acid, potassium fluoride and aluminum powder into mixed powder, then mix alumina sol, sodium hexametaphosphate, chromium oxide and water into liquid mixture, and then mix the mixed powder and the liquid mixture, thus being beneficial to the full dispersion among the raw materials. In the invention, the mixing time of the mixed powder and the liquid mixture is preferably 25-50 min, and preferably 30-45 min, so that the powder and the liquid are fully mixed.
The invention also provides the application of the anti-oxidation coating for the steel billet in the technical scheme in reducing the oxidation of the steel billet. In the present invention, an embodiment of the application preferably comprises the following steps: and before the billet is heated, spraying the billet anti-oxidation coating on the surface of the billet. In the invention, the thickness of the spray coating of the billet anti-oxidation coating is preferably 0.1-0.3 mm.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.
Example 1
Mixing 60g of sodium hexafluoroaluminate, 28g of potassium oxide, 2g of boric acid, 2g of potassium fluoride and 8g of high-alumina powder (the mass fraction of aluminum is more than or equal to 88%) to obtain mixed powder; wherein the fineness of the sodium hexafluoroaluminate is 325 meshes, and the fineness of the high-alumina powder is 800 meshes;
then, 24g of alumina sol, 1g of sodium hexametaphosphate, 5g of chromium trioxide and 70g of water are mixed to obtain a liquid mixture; wherein the fineness of the chromic oxide is 1000 meshes;
and stirring and mixing the mixed powder and the liquid mixture for 30min to obtain the billet anti-oxidation coating.
Example 2
Mixing 55g of sodium hexafluoroaluminate, 24g of potassium oxide, 1g of boric acid, 1.5g of potassium fluoride and 3.5g of high-alumina powder (the mass fraction of aluminum is more than or equal to 88%) to obtain mixed powder; wherein the fineness of the sodium hexafluoroaluminate is 325 meshes, and the fineness of the high-alumina powder is 800 meshes;
then, 20g of alumina sol, 0.7g of sodium hexametaphosphate, 3.5g of chromium oxide and 65g of water are mixed to obtain a liquid mixture; wherein the fineness of the chromic oxide is 1000 meshes;
and stirring and mixing the mixed powder and the liquid mixture for 40min to obtain the billet anti-oxidation coating.
Example 3
Mixing 63g of sodium hexafluoroaluminate, 28g of potassium oxide, 2.0g of boric acid, 1.8g of potassium fluoride and 5.2g of high-alumina powder (the mass fraction of aluminum is more than or equal to 88%) to obtain mixed powder; wherein the fineness of the sodium hexafluoroaluminate is 325 meshes, and the fineness of the high-alumina powder is 800 meshes;
then 25g of alumina sol, 0.9g of sodium hexametaphosphate, 4.5g of chromium trioxide and 70g of water were mixed to obtain a liquid mixture; wherein the fineness of the chromic oxide is 1000 meshes;
and stirring and mixing the mixed powder and the liquid mixture for 35min to obtain the billet anti-oxidation coating.
Example 4
Mixing 65g of sodium hexafluoroaluminate, 30g of potassium oxide, 3g of boric acid, 3g of potassium fluoride and 12.5g of high-alumina powder (the mass fraction of aluminum is more than or equal to 88%) to obtain mixed powder; wherein the fineness of the sodium hexafluoroaluminate is 325 meshes, and the fineness of the high-alumina powder is 800 meshes;
then, 30g of alumina sol, 1.5g of sodium hexametaphosphate, 7.5g of chromium oxide and 75g of water are mixed to obtain a liquid mixture; wherein the fineness of the chromic oxide is 1000 meshes;
and stirring and mixing the mixed powder and the liquid mixture for 45min to obtain the billet anti-oxidation coating.
Application example 1
A small bar mill for new metallurgy of steel sprays the steel billet anti-oxidation coating prepared in the embodiment 1 on the surface of the steel billet, and the thickness of the sprayed steel billet anti-oxidation coating is 0.1 mm; then heating at 1200 deg.C for 120min in gas atmosphere. After the heating is finished, the thickness of the oxide layer on the surface of the steel billet is tested, and the test result is as follows: the thickness of the oxide layer is 0.008 mm.
Comparative application example 1
A small bar factory for newly smelting steel adopts a common type anti-oxidation coating for a commercially available billet, and the common type anti-oxidation coating for the commercially available billet is sprayed on the surface of the billet, wherein the thickness of the sprayed coating layer is 0.1 mm; then heating at 1200 deg.C for 120min in gas atmosphere. After the heating is finished, the thickness of the oxide layer on the surface of the steel billet is tested, and the test result is as follows: the thickness of the oxide layer is 0.35 mm.
Compared with the comparative application example 1, the thickness of the scale oxide layer in the application example 1 is reduced by 97.7%, the thickness of the scale oxide layer is greatly reduced, and the burning loss is effectively reduced.
Application example 2
The billet steel anti-oxidation coating prepared in the example 2 is sprayed on the surface of a billet steel by a Xincheng special steel second steel mill, and the thickness of the sprayed billet steel anti-oxidation coating is 0.2 mm; then heating at 1200 ℃ for 72h in a gas combustion atmosphere. After the heating is finished, the thickness of the oxide layer on the surface of the steel billet is tested, and the test result is as follows: the thickness of the oxide layer is 0.01 mm.
Comparative application example 2
The common type anti-oxidation coating for the commercial steel billets is sprayed on the surfaces of the steel billets by adopting a common type anti-oxidation coating for the XingCheng special steel in a second steel rolling mill, wherein the thickness of the sprayed coating is 0.2 mm; then heating at 1200 ℃ for 72h in a gas combustion atmosphere. After the heating is finished, the thickness of the oxide layer on the surface of the steel billet is tested, and the test result is as follows: the thickness of the oxide layer is 0.3 mm.
Compared with the comparative application example 2, the thickness of the scale oxide layer in the application example 2 is reduced by 66.7%, the thickness of the scale oxide layer is greatly reduced, and the burning loss is effectively reduced.
Application example 3
Spraying the anti-oxidation coating of the steel billet prepared in the embodiment 3 on the surface of the steel billet by a first Jiyuan special steel rolling mill, wherein the thickness of the sprayed anti-oxidation coating of the steel billet is 0.3 mm; then heating at 1200 deg.C for 70min under gas combustion. After the heating is finished, the thickness of the oxide layer on the surface of the steel billet is tested, and the test result is as follows: the thickness of the oxide layer is 0.005 mm.
Comparative application example 3
The commercial common billet anti-oxidation coating is sprayed on the surface of a billet by a commercial common billet anti-oxidation coating adopted by a first Jiyuan special steel rolling mill, wherein the thickness of the sprayed coating is 0.3 mm; then heating at 1200 deg.C for 70min under gas combustion. After the heating is finished, the thickness of the oxide layer on the surface of the steel billet is tested, and the test result is as follows: the thickness of the oxide layer is 0.25 mm.
Compared with the comparative application example 3, the thickness of the scale oxide layer in the application example 3 is reduced by 98%, so that the thickness of the scale oxide layer is greatly reduced, and the burning loss is effectively reduced.
In conclusion, the anti-oxidation coating for the steel billet provided by the invention can effectively reduce the thickness of an iron scale oxide layer and effectively reduce the burning loss degree.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The anti-oxidation coating for the steel billet is characterized by comprising the following components in parts by mass:
the fineness of the sodium hexafluoroaluminate is 300-355 meshes; the fineness of the chromic oxide is 880-1180 meshes.
2. The steel slab anti-oxidation coating as claimed in claim 1, wherein the mass content of aluminum in the aluminum powder is not less than 88%.
3. The steel slab oxidation preventing coating according to claim 1 or 2, wherein the fineness of the aluminum powder is 700 to 830 mesh.
4. The method for preparing the billet anti-oxidation coating of any one of the claims 1 to 3, comprising the following steps:
mixing sodium hexafluoroaluminate, potassium oxide, boric acid, potassium fluoride and aluminum powder to obtain mixed powder;
mixing the aluminum sol, sodium hexametaphosphate, chromium oxide and water to obtain a liquid mixture;
and mixing the mixed powder with the liquid mixture to obtain the billet anti-oxidation coating.
5. Use of the steel slab oxidation preventing coating of any one of claims 1 to 3 for reducing oxidation of steel slabs.
6. Use according to claim 5, characterized in that it comprises the following steps: and before the billet is heated, spraying the billet anti-oxidation coating on the surface of the billet.
7. The use as claimed in claim 6, wherein the thickness of the sprayed layer of the anti-oxidation coating for the steel billet is 0.1-0.3 mm.
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| CN202010009104.4A CN111172370B (en) | 2020-01-06 | 2020-01-06 | Steel billet anti-oxidation coating and preparation method and application thereof |
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| CN202010009104.4A CN111172370B (en) | 2020-01-06 | 2020-01-06 | Steel billet anti-oxidation coating and preparation method and application thereof |
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| CN111172370B true CN111172370B (en) | 2022-02-15 |
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| WO2004009869A2 (en) * | 2002-07-24 | 2004-01-29 | University Of Dayton | Corrosion-inhibiting coating for metal surfaces |
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| CN102312065A (en) * | 2011-09-21 | 2012-01-11 | 镇江忆诺唯记忆合金有限公司 | Method for preventing GCr 15 steel surface oxidation |
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| CN104877397A (en) * | 2015-05-21 | 2015-09-02 | 石家庄炳欣冶金炉料有限公司 | High-temperature protective coating for steel billets and applications thereof |
| CN109111769A (en) * | 2018-08-10 | 2019-01-01 | 徐州和合新型建材有限公司 | A kind of steel billet environmental protection coating material |
| CN110184562A (en) * | 2019-03-11 | 2019-08-30 | 苏州金言来新材料科技有限公司 | A kind of steel workpiece vacuum aluminizing method |
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2020
- 2020-01-06 CN CN202010009104.4A patent/CN111172370B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004009869A2 (en) * | 2002-07-24 | 2004-01-29 | University Of Dayton | Corrosion-inhibiting coating for metal surfaces |
| CN102173648A (en) * | 2011-01-11 | 2011-09-07 | 上海胜星树脂涂料有限公司 | Water-based high-temperature-resistant oxidation-resistant inorganic paint and preparation method thereof |
| CN102312065A (en) * | 2011-09-21 | 2012-01-11 | 镇江忆诺唯记忆合金有限公司 | Method for preventing GCr 15 steel surface oxidation |
| CN104498683A (en) * | 2014-12-31 | 2015-04-08 | 苏州赛格瑞新材料有限公司 | Anti-oxidation coating for steel billet with high emissivity and preparation method of anti-oxidation coating |
| CN104877397A (en) * | 2015-05-21 | 2015-09-02 | 石家庄炳欣冶金炉料有限公司 | High-temperature protective coating for steel billets and applications thereof |
| CN109111769A (en) * | 2018-08-10 | 2019-01-01 | 徐州和合新型建材有限公司 | A kind of steel billet environmental protection coating material |
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