CN117511260A - Oriented billet decarburization-preventing coating, coating and preparation method thereof - Google Patents
Oriented billet decarburization-preventing coating, coating and preparation method thereof Download PDFInfo
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- CN117511260A CN117511260A CN202311438999.3A CN202311438999A CN117511260A CN 117511260 A CN117511260 A CN 117511260A CN 202311438999 A CN202311438999 A CN 202311438999A CN 117511260 A CN117511260 A CN 117511260A
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- 238000000576 coating method Methods 0.000 title claims abstract description 190
- 239000011248 coating agent Substances 0.000 title claims abstract description 189
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 104
- 239000010959 steel Substances 0.000 claims abstract description 104
- 238000005261 decarburization Methods 0.000 claims abstract description 51
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000010439 graphite Substances 0.000 claims abstract description 23
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 23
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 22
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 19
- 239000002904 solvent Substances 0.000 claims abstract description 13
- 230000003405 preventing effect Effects 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 24
- 238000005507 spraying Methods 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000007787 solid Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 20
- 238000012797 qualification Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 6
- 239000007769 metal material Substances 0.000 abstract description 2
- 239000003973 paint Substances 0.000 description 31
- 239000010410 layer Substances 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 10
- 230000008092 positive effect Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 238000009957 hemming Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 229910000976 Electrical steel Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- OBNDGIHQAIXEAO-UHFFFAOYSA-N [O].[Si] Chemical group [O].[Si] OBNDGIHQAIXEAO-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000015895 biscuits Nutrition 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 oxygen ions Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910000658 steel phase Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention provides an oriented billet decarburization-preventing coating, a coating and a preparation method thereof, belonging to the field of heat treatment protection of metal materials, wherein the coating comprises the following components: siO (SiO) 2 、Al 2 O 3 、MgO、CaO、ZrO 2 、TiO 2 、Cr 2 O 3 、SiC、B 2 O 3 Graphite and solvent; wherein, siO is calculated in weight parts 2 16 to 23 parts of Al 2 O 3 5 to 9 parts of MgO, 0.5 to 2.5 parts of CaO, 1 to 2.5 parts of ZrO 2 5 to 7 parts of TiO 2 0.5 to 2.5 parts of Cr 2 O 3 1 to 3 parts of SiC, 7 to 12 parts of B 2 O 3 5 to 9 parts of graphite, 4 to 7 parts of solvent and 32 to 38 parts of solvent. The decarburization-preventing coating provided by the application is sprayed on the two sides of the oriented steel billet after the narrow sectionA compact coating can be formed, the coating can inhibit decarburization of the edge of the oriented steel billet, greatly improve the biscuit-brittle defect of the hot curled edge of the oriented steel, and improve the quality qualification rate and the yield of the hot rolled edge of the oriented steel, thereby solving the technical problem that the decarburization-preventing coating for the oriented steel is lack in the prior art.
Description
Technical Field
The application relates to the technical field of heat treatment protection of metal materials, in particular to an oriented billet decarburization-preventing coating and a preparation method thereof.
Background
The oriented silicon steel is widely applied to manufacturing of transformer iron cores and is an important functional soft magnetic material, but decarburization of the oriented silicon steel in the heating process causes the problem of 'cake brittleness' of a heat-curled edge part. The problem of "biscuit" is that the decarburized upper and lower surfaces and the narrow surface in the heating process of the oriented steel billet cause that the content of C in the oriented steel is not high, but the oriented steel billet is subjected to the repulsive action of Si, so that the total decarburized layer depth of the oriented steel billet reaches about 3.00mm after being heated at high temperature. The "biscuit-like" defect not only reduces the quality yield of the hot coil of oriented steel, but also reduces the yield of the hot rolling process more severely because it has to be trimmed.
At present, the most common solution to the problem of 'cake crispness' of oriented silicon steel is to spray decarburization preventing paint on the surface of an oriented steel billet. However, in the prior art, the spray coating of oriented steel slabs is generally directed to high temperature route processes to reduce oxidation burn-out and steel conversion. So far, no spraying is performed in the industry for the decarburization prevention of oriented steel. Therefore, there is a need to develop a coating material for oriented steel that can exert a good decarburization preventing effect.
Disclosure of Invention
The application provides an oriented steel billet decarburization-preventing coating, a coating and a preparation method thereof, which are used for solving the technical problem that the decarburization-preventing coating for oriented steel is lacked in the prior art.
In a first aspect, the present application provides an oriented steel billet decarburization preventing coating, the coating comprising the components of: siO (SiO) 2 、Al 2 O 3 、MgO、CaO、ZrO 2 、TiO 2 、Cr 2 O 3 、SiC、B 2 O 3 Graphite and solvent; wherein, the weight portions of the components are calculated,
SiO 2 16 to 23 parts of Al 2 O 3 5 to 9 parts of MgO, 0.5 to 2.5 parts of CaO, 1 to 2.5 parts of ZrO 2 5 to 7 parts of TiO 2 0.5 to 2.5 parts of Cr 2 O 3 1 to 3 parts of SiC, 7 to 12 parts of B 2 O 3 5 to 9 parts of graphite, 4 to 7 parts of solvent and 32 to 38 parts of solvent.
Alternatively, siO is used in parts by weight 2 21 parts of Al 2 O 3 7.5 parts of MgO, 1.5 parts of CaO, 2 parts of ZrO 2 6 parts of TiO 2 1.5 parts of Cr 2 O 3 2.5 parts of SiC 10 parts of B 2 O 3 7 parts of graphite, 6 parts of water and 35 parts of water.
Optionally, the coating satisfies at least one of the following properties: density of 2.8X10 3 kg/m 3 ～3.0×10 3 kg/m 3 The solid content is 62-68%.
In a second aspect, the present application provides a method for preparing an oriented steel billet decarburization preventing coating, which is used for preparing the oriented steel billet decarburization preventing coating according to any embodiment of the first aspect, and the preparation method of the coating includes: and mixing the components in parts by weight, and stirring until the components are in suspension to obtain the oriented billet decarburization-preventing coating.
In a third aspect, the present application provides an oriented steel billet decarburization preventing coating formed by curing the coating according to any one of the embodiments of the first aspect.
Optionally, the thickness of the coating is 0.1 mm-3 mm.
In a fourth aspect, the present application provides a method for preparing an oriented billet decarburization preventing coating, the method for preparing the coating comprising:
atomizing a coating according to any one of the embodiments of the first aspect;
and coating the atomized coating on the surface of the oriented billet to form a coating.
Optionally, the amount of the coating is 0.2kg/m 2 ～0.6kg/m 2 。
Optionally, the amount of the coating is 0.5kg/m 2 。
Optionally, the temperature of the spray coating on the surface of the oriented steel billet is 10-750 ℃.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the method, through measuring and calculating the free energy and activity of C, fe and Si in steel, the solubility in an oriented steel phase, the thermal expansion coefficient and other parameters, the components and the content of the decarburization preventing coating are reasonably designed, after the coating is sprayed on the narrow sections on two sides of an oriented steel billet, a compact coating can be formed, before the coating is 900 ℃, the coating is subjected to softening film forming protection, and a film formed by the coating is adhered around an oriented steel billet matrix, so that the reaction of external oxidizing gas and the oriented steel billet matrix is isolated; the carbon potential is mainly balanced at 900-1050 ℃; the solid-phase sintered layer is reached after 1050 ℃ to form a compact structure, and the compact structure isolates the external atmosphere, but does not react with the steel matrix, so that the decarburization is well inhibited in the high-temperature heating process after the oriented billet is put into the furnace. On the other hand, although the coating formed after spraying has a compact structure and adheres to the surface of the oriented billet substrate, in the development of coating design, the expansion coefficients of the coating and the oriented billet are designed to be 23% -28%. Considering that the coating needs to fall off completely after the metal is heated, when the oriented billet is cooled and the thermal expansion coefficient of the coating is different, the surface binding force between the oriented billet and the coating is weakened, and the coating can be automatically peeled off under high-pressure water, so that the process of removing the coating is reduced, and the cost is saved. Therefore, the decarburization preventing coating provided by the application can inhibit decarburization of the edge of the oriented steel billet, greatly improve the biscuit-like defect of the hot curled edge part of the oriented steel, and improve the quality qualification rate and the yield of the hot curled edge of the oriented steel.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic flow chart of a method for preparing an oriented billet decarburization preventing coating according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an anti-decarburization mechanism of an oriented billet coating provided in an embodiment of the present application;
FIG. 3 is a graph of the total decarburized layer of the coated oriented steel billet provided in example 1 of the present application after heating;
FIG. 4 is a quality diagram of a hot hemming portion of the spray coating steel provided in example 1 of the present application;
FIG. 5 is a graph of the total decarburized layer after heating of an uncoated oriented billet provided in comparative example 1 of the present application;
FIG. 6 is a mass plot of the thermal hemming portion of the non-spray coated steel provided in comparative example 1 of the present application;
reference numerals: 100. orienting the billet matrix; 200. coating (softening film formation); 300. a thin oxide layer; 400. coating (carbon potential balance); 500. coating (solid phase sintering).
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Various embodiments of the present application may exist in a range format; it should be understood that the description in a range format is merely for convenience and brevity and should not be interpreted as a rigid limitation on the scope of the application. It is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In addition, in the description of the present application, the terms "include", "comprise", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
Unless specifically indicated otherwise, the various raw materials, reagents, instruments, equipment, and the like used in this application are commercially available or may be prepared by existing methods.
In a first aspect, the present application provides an oriented steel billet decarburization resistant coating, the coating comprising the following components: siO (SiO) 2 、Al 2 O 3 、MgO、CaO、ZrO 2 、TiO 2 、Cr 2 O 3 、SiC、B 2 O 3 Graphite and solvent; wherein, the weight portions of the components are calculated,
SiO 2 16 to 23 parts of Al 2 O 3 5 to 9 parts of MgO, 0.5 to 2.5 parts of CaO, 1 to 2.5 parts of ZrO 2 5 to 7 parts of TiO 2 0.5 to 2.5 parts of Cr 2 O 3 1 to 3 parts of SiC, 7 to 12 parts of B 2 O 3 5 to 9 parts of graphite, 4 to 7 parts of solvent and 32 to 38 parts of solvent.
In some embodiments, the solvent is generally water and water analogs.
In some embodiments, siO is present in parts by weight 2 21 parts of Al 2 O 3 7.5 parts of MgO, 1.5 parts of CaO, 2 parts of ZrO 2 6 parts of TiO 2 1.5 parts of Cr 2 O 3 2.5 parts of SiC 10 parts of B 2 O 3 7 parts of graphite, 6 parts of water and 35 parts of water.
In some embodiments, the coating may satisfy at least one of the following properties: density of 2.8X10 3 kg/m 3 ～3.0×10 3 kg/m 3 The solid content is 62-68%.
Furthermore, the coatings provided herein are useful for decarburization prevention of oriented steel and oriented steel analogues.
Control of SiO 2 16 to 23 parts by mass of Al 2 O 3 The positive effects of the composition are that the composition comprises 5-9 parts by mass: al (Al) 2 O 3 Is an amphoteric oxide commonly used in paint, and has small thermal expansion coefficient and proper surface tension. Addition of Al 2 O 3 A difference between the coefficients of expansion of the coating and the metal substrate can be made so that the coating readily self-exfoliates. At the same time Al 2 O 3 The coating viscosity can be enhanced because of its combination with SiO 2 The oxygen ions of (2) can form tetrahedral grids of an oxygen-silicon structure, so that the compactness of the high-temperature-resistant anti-oxidation coating is enhanced. Al (Al) 2 O 3 And SiO 2 Mullite with better performance can be formed. The inclusion of mullite in the coating greatly increases its oxidation resistance and stability. Specifically, the SiO 2 The mass parts of (C) may be 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, etc., the Al 2 O 3 Is 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, etc.
Control of ZrO 2 Is 5 to 7 parts by mass of TiO 2 The positive effects of the composition are that the composition comprises 0.5-2.5 parts by mass: zrO (ZrO) 2 、TiO 2 The coating has extremely small linear expansion coefficient, and the linear expansion coefficient of the coating can be obviously reduced by adding a small amount of the coating, so that the self-peeling performance of the coating after heating is greatly improved. Specifically, the ZrO 2 Can be 5 parts, 6 parts, 7 parts, etc., of the TiO 2 Is 0.5 part, 1 part, 1.5 parts, 2 parts, 2.5 parts, etc.
The positive effects of controlling the mass part of MgO to be 0.5 to 2.5 parts and CaO to be 1 to 2.5 parts are that: stabilizing oxide MgO, caO enables ZrO 2 The crystal structure is stable after changing from monoclinic crystal to cubic crystal at 1000 ℃. ZrO due to phase transition at 1000 DEG C 2 The volume expansion and the thermal expansion coefficient are small, so that the coating can be cooled to achieve self-peeling, and the requirement of selecting the expansion coefficient of the coating is completely met. If the transition from monoclinic to cubic phase alone forms volume expansions, this can lead to cracking of the coating, since these volume expansions are abrupt. Coefficient of linear expansionThe differential occurrence of thermal stresses adversely affects the bonding of the substrate and the coating. The added stabilizers CaO and MgO can lead ZrO to 2 Preserving some tetragonal phases, resulting in reduced thermal stress as the volume changes. Specifically, the mass parts of MgO are 0.5 part, 1 part, 1.5 part, 2 parts, 2.5 parts, etc., and the mass parts of CaO are 1 part, 1.5 parts, 2 parts, 2.5 parts, etc.
Control of Cr 2 O 3 The positive effects of the composition are that the composition comprises 1 to 3 parts by mass: cr (Cr) 2 O 3 Can improve the healing crack and wettability of the coating, has a small friction coefficient and can be used as refractory filler of coating. Specifically, the Cr 2 O 3 Is 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, etc.
Control B 2 O 3 The positive effects of the composition are that the composition comprises 5-9 parts by mass: b (B) 2 O 3 The surface tension of the coating is small, the spreading film of the coating is facilitated, the wetting capacity of the coating is enhanced, and cracks generated when the coating is at high temperature can be healed. Specifically, the B 2 O 3 The mass parts of (a) may be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, etc.
The positive effects of controlling the mass part of SiC to 7-12 parts and the mass part of graphite to 4-7 parts are that: siC and graphite are special function powders that react at high temperatures as follows: siC+O 2 ＝SiO 2 +C、C+O 2 ＝CO 2 Both reactions consume oxygen and produce SiO with good function 2 . There are two ways in which the generated C can exist, one is to react with oxygen and the other is to infiltrate the metal surface. SiC and graphite can not only prevent oxidation but also be used to prevent decarburization. Specifically, the SiC may be 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, etc., and the graphite may be 4 parts, 5 parts, 6 parts, 7 parts, etc.
In a second aspect, the present application provides a method for preparing an oriented steel billet decarburization preventing coating, which is used for preparing the oriented steel billet decarburization preventing coating according to any embodiment of the first aspect, and the preparation method of the coating includes: and mixing the components in parts by weight, and stirring until the components are in suspension to obtain the oriented billet decarburization-preventing coating.
In a third aspect, the present application provides an oriented steel billet decarburization preventing coating formed by curing the coating according to any one of the embodiments of the first aspect.
In some embodiments, the thickness of the coating is 0.1mm to 3mm.
The positive effect of controlling the thickness of the coating to be 0.1 mm-3 mm: the thickness of the coating is in the range, so that decarburization of the edge of the oriented steel billet can be restrained, the biscuit-crisp defect of the hot curled edge of the oriented steel billet is greatly improved, and the quality qualification rate and the yield of the hot curled edge of the oriented steel billet are improved. Specifically, the thickness of the coating may be 0.1mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, etc.
In a fourth aspect, the present application provides a method for preparing an oriented billet decarburization preventing coating, the method for preparing the coating comprising:
s1, atomizing the paint according to any embodiment of the first aspect;
s2, coating the atomized coating on the surface of the oriented billet to form a coating.
In some embodiments, the oriented billet surface is a two-sided narrow section of the oriented billet.
The coating is sprayed on the narrow sections at the two sides of the oriented billet, and has the positive effects that: the coating of only the hot-rolled edge portion has improved pertinence to the "crispy" shape defect, and reduces the consumption of the coating.
In some embodiments, the coating is used in an amount of 0.2kg/m 2 ～0.6kg/m 2 。
In some embodiments, the coating is used in an amount of 0.5kg/m 2 。
The dosage of the coating is controlled to be 0.2kg/m 2 ～0.6kg/m 2 Has the positive effects that: a proper amount of paint can be sprayed to form a compact coating, and the coating can inhibit decarburization of the edge of the oriented steel billet, so that the biscuit-like defect of the hot curled edge of the oriented steel billet is greatly improved. If the amount of the coating is too small, a dense coating layer is not formed, and if the amount is too large, the decarburization preventing cost increases. Specifically, the amount of the coating may be 0.2kg/m 2 、0.3kg/m 2 、0.4kg/m 2 、0.5kg/m 2 、0.6kg/m 2 Etc.
In some embodiments, the temperature of the spray coating on the surface of the oriented steel blank is from 10 ℃ to 750 ℃.
The positive effect that the temperature of the spray coating on the surface of the oriented billet is 10-750 ℃: the coating prepared in the application can be directly sprayed on a high-temperature oriented steel billet, has higher adhesiveness, and can prevent the problem of failure caused by cracking and crushing of the coating when the highest temperature of the sprayed oriented steel billet reaches 750 ℃. Specifically, the temperature of the spray coating on the surface of the oriented billet may be 10 ℃, 100 ℃, 200 ℃, 300 ℃, 400 ℃, 500 ℃, 600 ℃, 700 ℃, 750 ℃, or the like.
The present application is further illustrated below in conjunction with specific examples. It should be understood that these examples are illustrative only of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
Example 1
The oriented billet decarburization-preventing coating comprises the following components in parts by weight: siO (SiO) 2 21 parts of Al 2 O 3 7.5 parts of MgO, 1.5 parts of CaO, 2 parts of ZrO 2 6 parts of TiO 2 1.5 parts of Cr 2 O 3 2.5 parts of SiC 10 parts of B 2 O 3 7 parts of graphite, 6 parts of water and 35 parts of water. The density of the coating was 2.9.10 3 kg/m 3 The solids content was 65%.
The preparation method of the oriented billet decarburization preventing coating provided by the embodiment of the invention comprises the following steps: and adding the components into a container according to the parts by weight, and stirring until the components are in uniform suspension to obtain the oriented billet decarburization-preventing coating.
The preparation method of the oriented billet decarburization preventing coating comprises the following steps: a paint spraying apparatus is built, paint is pumped from a paint tank by a pump and sent to a nozzle, and compressedAnd atomizing the coating under the action of air. When the oriented steel billet passes through a coating spraying device in the process of being conveyed to the furnace inlet end of the heating furnace by the furnace inlet roller way, the atomized coating is sprayed on the surfaces of the two sides of the oriented steel billet by a nozzle after the oriented steel billet is automatically identified, the temperature of the surfaces of the oriented steel billet is 500 ℃, the final coating thickness of the surfaces of the two sides of the oriented steel billet reaches 1.5mm, and the consumption of the coating is 0.5kg/m 2 。
The depth of the decarburized layer of the heated oriented steel billet sample (not the depth of the decarburized layer of the final finished product) is reduced from 3.11mm to 0.97mm, so that the quality qualification rate and the yield of the oriented steel hot rolled finished product are improved.
Example 2
The oriented billet decarburization-preventing coating comprises the following components in parts by weight: siO (SiO) 2 23 parts of Al 2 O 3 8 parts of MgO, 2 parts of CaO and ZrO 2 7 parts of TiO 2 2 parts of Cr 2 O 3 2 parts of SiC 9 parts of B 2 O 3 6 parts of graphite, 7 parts of graphite and 32 parts of water. The density of the coating was 2.92.10 3 kg/m 3 The solids content was 68%.
The preparation method of the oriented billet decarburization preventing coating provided by the embodiment of the invention comprises the following steps: and adding the components into a container according to the parts by weight, and stirring until the components are in uniform suspension to obtain the oriented billet decarburization-preventing coating.
The preparation method of the oriented billet decarburization preventing coating comprises the following steps: a paint spraying device is built, paint is pumped out of a paint tank by a pump and is sent to a nozzle, and the paint is atomized under the action of compressed air. When the oriented steel billet passes through a coating spraying device in the process of being conveyed to the furnace inlet end of the heating furnace by the furnace inlet roller way, the atomized coating is sprayed on the surfaces of the two sides of the oriented steel billet by a nozzle after the oriented steel billet is automatically identified, the temperature of the surfaces of the oriented steel billet is 500 ℃, the final coating thickness of the surfaces of the two sides of the oriented steel billet reaches 0.5mm, and the consumption of the coating is 0.3kg/m 2 。
The depth of the decarburized layer of the heated oriented steel billet sample (not the depth of the decarburized layer of the final finished product) is reduced from 3.11mm to 1.26mm, so that the quality qualification rate and the yield of the oriented steel hot rolled finished product are improved.
Example 3
The oriented billet decarburization-preventing coating comprises the following components in parts by weight: siO (SiO) 2 20 parts of Al 2 O 3 7 parts of MgO, 2 parts of CaO and ZrO 2 6 parts of TiO 2 2 parts of Cr 2 O 3 1 part of SiC 9 parts of B 2 O 3 6 parts of graphite, 5 parts of graphite and 38 parts of water. The density of the coating was 2.89.10 3 kg/m 3 The solids content was 62%.
The preparation method of the oriented billet decarburization preventing coating provided by the embodiment of the invention comprises the following steps: and adding the components into a container according to the parts by weight, and stirring until the components are in uniform suspension to obtain the oriented billet decarburization-preventing coating.
The preparation method of the oriented billet decarburization preventing coating comprises the following steps: a paint spraying device is built, paint is pumped out of a paint tank by a pump and is sent to a nozzle, and the paint is atomized under the action of compressed air. When the oriented steel billet passes through a coating spraying device in the process of being conveyed to the furnace inlet end of the heating furnace by the furnace inlet roller way, the atomized coating is sprayed on the surfaces of the two sides of the oriented steel billet by a nozzle after the oriented steel billet is automatically identified, the temperature of the surfaces of the oriented steel billet is 500 ℃, the final coating thickness of the surfaces of the two sides of the oriented steel billet reaches 2.0mm, and the consumption of the coating is 0.55kg/m 2 。
The depth of the decarburized layer of the heated oriented steel billet sample (not the depth of the decarburized layer of the final finished product) is reduced from 3.11mm to 1.02mm, so that the quality qualification rate and the yield of the oriented steel hot rolled finished product are improved.
Comparative example 1
The oriented billet was directly heated without spraying a coating material on the surface of the oriented billet, and the decarburized layer depth of the heated oriented billet sample was measured to be 3.11mm.
Comparative example 2
The decarburization preventing coating for the oriented steel billet in the comparative example of the present invention comprises the following components in parts by weightThe components of the paint are as follows: siO (SiO) 2 40 parts of Al 2 O 3 15 parts of ZrO 2 10 parts of water and 35 parts of water. The density of the coating was 2.9.10 3 kg/m 3 The solids content was 65%.
The preparation method of the oriented billet decarburization preventing coating provided by the embodiment of the invention comprises the following steps: and adding the components into a container according to the parts by weight, and stirring until the components are in uniform suspension to obtain the oriented billet decarburization-preventing coating.
The preparation method of the oriented billet decarburization preventing coating in the comparative example comprises the following steps: a paint spraying device is built, paint is pumped out of a paint tank by a pump and is sent to a nozzle, and the paint is atomized under the action of compressed air. When the oriented steel billet passes through a coating spraying device in the process of being conveyed to the furnace inlet end of the heating furnace by the furnace inlet roller way, the atomized coating is sprayed on the surfaces of the two sides of the oriented steel billet by a nozzle after the oriented steel billet is automatically identified, the temperature of the surfaces of the oriented steel billet is 500 ℃, the final coating thickness of the surfaces of the two sides of the oriented steel billet reaches 1.5mm, and the consumption of the coating is 0.5kg/m 2 。
The decarburized layer depth of the heated oriented billet sample (not the decarburized layer depth of the final product) was reduced from 3.11mm to 2.08mm. SiO when based on surface tension 2 、ZrO 2 、Al 2 O 3 Can be used as the main component of the paint, but is lack of CaO, mgO, B 2 O 3 、SiC、Cr 2 O 3 And auxiliary materials such as graphite which can improve the coating performance, so that the decarburization preventing effect is poor.
Comparative example 3
The oriented billet decarburization-preventing coating in the comparative example comprises the following components in parts by weight: siO (SiO) 2 23 parts of Al 2 O 3 9 parts of ZrO 2 7 parts of TiO 2 2 parts of Cr 2 O 3 2 parts of SiC 9 parts of B 2 O 3 7 parts of graphite, 6 parts of water and 35 parts of water. The density of the coating was 2.9.10 3 kg/m 3 The solids content was 65%.
The preparation method of the oriented billet decarburization preventing coating provided by the embodiment of the invention comprises the following steps: and adding the components into a container according to the preset weight parts, and stirring until the components are in uniform suspension to obtain the oriented billet decarburization-preventing coating.
The preparation method of the oriented billet decarburization preventing coating comprises the following steps: a paint spraying device is built, paint is pumped out of a paint tank by a pump and is sent to a nozzle, and the paint is atomized under the action of compressed air. When the oriented steel billet passes through a coating spraying device in the process of being conveyed to the furnace inlet end of the heating furnace by the furnace inlet roller way, the atomized coating is sprayed on the surfaces of the two sides of the oriented steel billet by a nozzle after the oriented steel billet is automatically identified, the temperature of the surfaces of the oriented steel billet is 500 ℃, the final coating thickness of the surfaces of the two sides of the oriented steel billet reaches 1.5mm, and the consumption of the coating is 0.5kg/m 2 。
The decarburized layer depth of the heated oriented billet sample (not the decarburized layer depth of the final product) was reduced from 3.11mm to 1.56mm. ZrO due to the lack of stable oxides such as MgO, caO and the like in the coating 2 The transformation of monoclinic phase to cubic phase at 1000 ℃ causes volume expansion, which results in cracking of the coating and deterioration of decarburization preventing effect.
Comparative example 4
The oriented billet decarburization-preventing coating in the comparative example comprises the following components in parts by weight: siO (SiO) 2 30 parts of Al 2 O 3 9 parts of MgO, 2.5 parts of CaO, 2.5 parts of ZrO 2 7 parts of TiO 2 2 parts of Cr 2 O 3 3 parts of B 2 O 3 9 parts of water and 35 parts of water. The density of the coating was 2.9.10 3 kg/m 3 The solids content was 65%.
The preparation method of the oriented billet decarburization preventing coating provided by the embodiment of the invention comprises the following steps: and adding the components into a container according to the parts by weight, and stirring until the components are in uniform suspension to obtain the oriented billet decarburization-preventing coating.
The preparation method of the oriented billet decarburization preventing coating comprises the following steps: a paint spraying device is built, paint is pumped out of a paint tank by a pump and is sent to a nozzle, and the paint is sprayed out of the paint tank by compressed airThe paint is atomized. When the oriented steel billet passes through a coating spraying device in the process of being conveyed to the furnace inlet end of the heating furnace by the furnace inlet roller way, the atomized coating is sprayed on the surfaces of the two sides of the oriented steel billet by a nozzle after the oriented steel billet is automatically identified, the temperature of the surfaces of the oriented steel billet is 500 ℃, the final coating thickness of the surfaces of the two sides of the oriented steel billet reaches 1.5mm, and the consumption of the coating is 0.5kg/m 2 。
The decarburized layer depth of the heated oriented billet sample (not the decarburized layer depth of the final product) was reduced from 3.11mm to 1.82mm. Because the coating lacks powder materials with special functions such as SiC, graphite and the like, the decarburization preventing effect is poor.
In addition, referring to the schematic diagram of the decarburization preventing mechanism of the oriented steel billet coating shown in fig. 2, during the high-temperature heating process, the decarburization preventing mechanism of the novel coating coated on the surface of the oriented steel billet mainly comprises three stages: before 900 ℃, the coating is adhered around the oriented steel billet matrix by softening film forming protection, so that the reaction between external oxidizing gas and the oriented steel billet matrix is isolated; the carbon potential is mainly balanced at 900-1050 ℃; after 1050 ℃, the solid-phase sintered layer is formed to form a compact structure, and the compact structure isolates the external atmosphere, but does not react with the steel matrix, thereby achieving the purpose of decarburization prevention.
Referring to the comparison of the total decarburized layer diagram after heating the coated oriented steel billet shown in fig. 3 and the total decarburized layer diagram after heating the uncoated oriented steel billet shown in fig. 5, after heating the coated oriented steel billet by a normal heating process of oriented silicon steel in a heating furnace, the total decarburized layer depth of the steel sample of the coated oriented steel billet is obviously smaller than the total decarburized layer depth of the uncoated oriented steel billet, and the quality qualification rate and the yield of the hot rolled finished product of the oriented steel are improved.
Referring to the comparison of the spray coating steel heat-hemming portion quality plot shown in fig. 4 and the non-spray coating steel heat-hemming portion quality plot shown in fig. 6, the heat-hemming portion quality corresponding to the coated oriented steel billet is significantly better than the heat-hemming portion quality corresponding to the non-coated oriented steel billet for the same heat-oriented steel billet.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An oriented billet decarburization preventing coating, characterized in that the components of the coating comprise: siO (SiO) 2 、Al 2 O 3 、MgO、CaO、ZrO 2 、TiO 2 、Cr 2 O 3 、SiC、B 2 O 3 Graphite and solvent; wherein, the weight portions of the components are calculated,
SiO 2 16 to 23 parts of Al 2 O 3 5 to 9 parts of MgO, 0.5 to 2.5 parts of CaO, 1 to 2.5 parts of ZrO 2 5 to 7 parts of TiO 2 0.5 to 2.5 parts of Cr 2 O 3 1 to 3 parts of SiC, 7 to 12 parts of B 2 O 3 5 to 9 parts of graphite, 4 to 7 parts of solvent and 32 to 38 parts of solvent.
2. The oriented steel billet decarburization preventing coating according to claim 1, wherein the SiO is in parts by weight 2 21 parts of Al 2 O 3 7.5 parts of MgO, 1.5 parts of CaO, 2 parts of ZrO 2 6 parts of TiO 2 1.5 parts of Cr 2 O 3 2.5 parts of SiC 10 parts of B 2 O 3 7 parts of graphite, 6 parts of water and 35 parts of water.
3. The oriented steel billet decarburization preventing coating according to claim 1, wherein the coating meets at least one of the following properties: density of 2.8X10 3 kg/m 3 ～3.0×10 3 kg/m 3 The solid content is 62-68%.
4. A method for preparing the oriented billet decarburization preventing coating, which is used for preparing the oriented billet decarburization preventing coating according to any one of claims 1 to 3, the method for preparing the coating comprising: and mixing the components in parts by weight, and stirring until the components are in suspension to obtain the oriented billet decarburization-preventing coating.
5. An oriented steel billet decarburization preventing coating, characterized in that the coating is formed by curing the coating according to any one of claims 1 to 3.
6. The coating of claim 5, wherein the thickness of the coating is 0.1mm to 3mm.
7. A method for preparing an oriented billet decarburization-preventing coating, which is characterized by comprising the following steps:
atomizing the coating of any one of claims 1-3;
and coating the atomized coating on the surface of the oriented billet to form a coating.
8. The method for preparing a coating according to claim 7, wherein the amount of the coating is 0.2kg/m 2 ～0.6kg/m 2 。
9. The method for preparing a coating according to claim 8, wherein the amount of the coating is 0.5kg/m 2 。
10. The method of claim 7, wherein the temperature of the spray coating on the surface of the oriented billet is between 10 ℃ and 750 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117844280A (en) * | 2024-03-08 | 2024-04-09 | 江苏省沙钢钢铁研究院有限公司 | High-temperature antioxidant coating for steel billets and coating method thereof |
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| CN113943501A (en) * | 2021-10-27 | 2022-01-18 | 上海摩瑟尔科学技术有限公司 | High-temperature anti-oxidation protective coating and preparation method thereof |
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| CN108102436A (en) * | 2017-12-28 | 2018-06-01 | 邓卫 | Low-carbon alloy steel high-temp antioxidizing paint |
| CN112940544A (en) * | 2019-12-11 | 2021-06-11 | 宝武特种冶金有限公司 | High-alloy billet anti-oxidation coating resistant to high temperature and long-time heating and coating method |
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