CN116855877A - Method for controlling oxidation product proportion of Hi-B steel decarburization annealing plate - Google Patents
Method for controlling oxidation product proportion of Hi-B steel decarburization annealing plate Download PDFInfo
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- CN116855877A CN116855877A CN202310786138.8A CN202310786138A CN116855877A CN 116855877 A CN116855877 A CN 116855877A CN 202310786138 A CN202310786138 A CN 202310786138A CN 116855877 A CN116855877 A CN 116855877A
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- 238000000137 annealing Methods 0.000 title claims abstract description 52
- 238000005261 decarburization Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000003647 oxidation Effects 0.000 title claims abstract description 33
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 30
- 239000010959 steel Substances 0.000 title claims abstract description 30
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 14
- 229910004283 SiO 4 Inorganic materials 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- 238000005121 nitriding Methods 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000011521 glass Substances 0.000 abstract description 5
- 230000000007 visual effect Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 229910000976 Electrical steel Inorganic materials 0.000 description 12
- 239000000758 substrate Substances 0.000 description 9
- 230000007547 defect Effects 0.000 description 6
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 6
- 229910052919 magnesium silicate Inorganic materials 0.000 description 6
- 235000019792 magnesium silicate Nutrition 0.000 description 6
- 239000000391 magnesium silicate Substances 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052840 fayalite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
- C23C8/18—Oxidising of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous 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
Abstract
The invention discloses a method for controlling the proportion of oxidation products of a decarburization annealing plate of Hi-B steel, which establishes a relation between the dew point temperature of a decarburization annealing process and the proportion of the oxidation products through the hydrogen-water partial pressure ratio, and realizes the control of the proportion of the oxidation products of the decarburization annealing plate through the control of the dew point temperature of the decarburization annealing. The dew point temperature and the proportion of oxidation products are related by the following relation: dew point temperature and partial pressure ratio P H2O /P H2 A relationship between; oxygen content and partial pressure ratio P at decarburization annealing temperature H2O /P H2 A relationship between; oxygen contentAnd oxidation product Fe 2 SiO 4 And SiO 2 Relationship between them. The invention realizes the corresponding relation between the decarburization annealing dew point temperature and the proportion of oxidation products, so that the abstract oxide layer becomes more visual; changing the control of the decarburization annealing oxidation product ratio from qualitative to quantitative; laying foundation for forming good glass film bottom layer.
Description
Technical Field
The invention belongs to the technical field of cold-rolled oriented silicon steel, and particularly relates to a method for controlling the proportion of oxidation products of a Hi-B steel decarburization annealing plate.
Background
The oriented silicon steel has extremely strong Gaussian texture {110} <001>, namely the <001> direction of almost all grains is parallel to the rolling direction of a plate strip, and the {110} crystal face is parallel to the rolling face, so that the oriented silicon steel has the best easy magnetization performance under the oriented magnetic field. The iron core of the transformer is manufactured by using the magnetic core, and under the working condition of a directional magnetic field, the extremely high magnetic induction and extremely low iron loss of the magnetic core can obviously save materials and electric energy. The oriented silicon steel is generally divided into common oriented silicon steel (CGO steel) and high magnetic induction oriented silicon steel (Hi-B steel), the oriented silicon steel produced by the two cold rolling methods is common oriented silicon steel, and the high magnetic induction oriented silicon steel produced by the one cold rolling method is referred to as Hi-B steel. The CGO steel generally contains 0.03 to 0.05% C before decarburization annealing, and the mass fraction of the Hi-B steel C is about 0.06 to 0.075% unlike the CGO steel.
Before decarburization annealing, the oriented silicon steel has a certain carbon content, 10% -25% of austenite can be ensured to appear in the strip steel during hot rolling, grains are fine and uniform during hot rolling deformation due to the existence of ferrite and austenite two-phase structures, and the dissolution of the inhibitor A1N is facilitated due to the existence of the austenite structures. If the carbon content in the steel matrix is too low, the grains will grow significantly during high temperature heating, and the hot rolled structure becomes very coarse and very uneven. After finishing the function of ensuring the fineness and homogenization of the hot rolling structure, the excessive carbon is required to be removed through decarburization annealing treatment, the C in the steel is decarburized to below 30ppm, the steel is ensured to be in a single ferrite phase during high-temperature annealing, a perfect secondary recrystallization structure is developed, S and N in the steel are removed, and the magnetic aging of the product is eliminated.
During decarburization annealing, fe element on the surface of the steel strip is oxidized with water vapor to form FeO, and the oxidizing capacity of the water vapor is insufficient to oxidize the Fe element directly into Fe 2 O 3 . Besides the oxidation of C and Fe, si element on the surface of the steel belt is more easily oxidized by water vapor to generate compact SiO 2 SiO produced 2 Synthesis of fayalite 2FeO.SiO from particles and FeO 2 . After the decarburization annealing process is finished, a layer mainly composed of SiO is formed on the surface of the steel strip 2 、FeO、2FeO·SiO 2 And an oxide layer formed by the above steps, wherein the oxide layer is a substrate for forming a magnesium silicate glass film in the subsequent steps. By letting Fe 2 SiO4/SiO 2 When the alloy is in the range of 0.16 to 0.68, the formed bottom layer has good quality, sulfur in the steel cannot enter an oxide film prematurely during the purification annealing, and the alloy maintains strong inhibition force and has good magnetism. Fe in oxide film 2 SiO 4 High content of SiO 2 When the content is small, the thickness of the bottom layer formed later is uneven, and the defect of the dotted dew substrate is easy to occur, but Fe 2 SiO 4 Too small a content, the resulting underlayer is uneven, and the adhesion of the underlayer deteriorates due to too low a total oxygen content in the oxide film.
Disclosure of Invention
The invention aims to provide a method for controlling the proportion of oxide products of a decarburization annealing plate of Hi-B steel, which ensures that oxide Fe in an oxide layer formed by decarburization annealing is ensured by controlling the dew point temperature of the decarburization annealing 2 SiO 4 And SiO 2 The composition ratio of the magnesium silicate glass film lays a foundation for forming a good magnesium silicate glass film bottom layer, improves the defects of the punctiform dew substrate of the oriented silicon steel finished plate and improves the surface quality.
In order to achieve the aim of the invention, the technical scheme adopted by the invention is as follows:
a method for controlling the oxidation product proportion of a Hi-B steel decarburization annealing plate comprises the steps of establishing a relation between the dew point temperature of a decarburization annealing process and the oxidation product proportion through a hydrogen-water partial pressure ratio, and controlling the oxidation product proportion of the decarburization annealing plate through the control of the decarburization annealing dew point temperature, wherein the relation between the dew point temperature and the oxidation product proportion is established through the following relation;
1) Dew point temperature and partial pressure ratio P H2O /P H2 Relationship between them.
2) Oxygen content and partial pressure ratio P at decarburization annealing temperature H2O /P H2 A relationship between; oxygen content and oxidation product Fe 2 SiO 4 And SiO 2 Relationship between them.
Further, the Hi-B steel comprises the following chemical components in percentage by mass: c:0.043% -0.073%, si:2.60 to 3.80 percent of Mn:0.0018 to 0.0180 percent, S:0.002% -0.009%, P:0.0023% -0.0180%, als:0.009% -0.0750%, N:0.0023 to 0.0100 percent, and the balance of Fe and unavoidable impurities.
Further, fe in decarburized annealed sheet 2 SiO 4 /SiO 2 The ratio of (2) is controlled to be 0.16-0.68.
Further, the decarburization annealing atmosphere of the cold-rolled sheet is: wet 75% H with a humidifying tank temperature in the range of 30-80 DEG C 2 +25％N 2 The method comprises the steps of carrying out a first treatment on the surface of the The decarburization annealing temperature is: 830-850 ℃; the decarburization annealing time is: 2-3 min.
Further, decarburization annealing and nitriding treatment are carried out on the same continuous furnace production line, and the nitriding process is as follows: contains 2 to 15 percent of NH 3 Dry 75% H 2 +N 2 Nitriding treatment is carried out for 10-50 seconds at 700-810 ℃ in the atmosphere. The decarburization annealed sheet is nitrided and annealed and then coated with a MgO separating agent.
The invention has the beneficial effects that:
(1) The oxide layer is controlled by the decarburization annealing dew point temperature, so that the method is simple and easy to operate;
(2) The corresponding relation between the decarburization annealing dew point temperature and the proportion of oxidation products is realized, so that an abstract oxide layer becomes more visual;
(3) The control of the decarburization annealing oxidation product proportion is changed from qualitative to quantitative through calculation;
(4) The accurate control of the oxide layer lays a foundation for the formation of a good glass film bottom layer;
(5) Effectively reducing the number of defects of the dot exposed substrate.
Drawings
FIG. 1 shows dew point temperature and partial pressure ratio P H2O /P H2 A relationship between;
FIG. 2 shows the oxygen content and partial pressure ratio P at 850 DEG C H2O /P H2 A relationship between;
FIG. 3 shows the oxygen content and the oxidation product Fe at 850 DEG C 2 SiO 4 And SiO 2 Relationship between them.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The described embodiments are only some, but not all, embodiments of the invention. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
1. Technological process for producing oriented silicon steel by using control method of the invention
1. Composition and preliminary process
(1) Composition of the components
The mass percentages of Hi-B steel elements are shown in the following Table 1, and the balance is Fe and impurities.
Table 1 mass percent of Hi-B steel elements, wt%
(2) Process for producing a solid-state image sensor
The cold-rolled sheet with the thickness of 0.27mm is manufactured by adopting smelting, continuous casting, hot rolling, normalizing and one-time cold rolling processes.
2. And controlling the proportion of oxide in the decarburization annealing process and the oxide layer.
(1) Decarburization annealing process
The decarburization annealing atmosphere of the cold-rolled sheet is: wet 75% H with a humidifying tank temperature in the range of 40-70 DEG C 2 +25％N 2 The method comprises the steps of carrying out a first treatment on the surface of the The decarburization annealing temperature is: 850 ℃; the decarburization annealing time is: 2.5min.
(2) Control of decarburized plate oxide layer structure
To find the relationship between dew point temperature and oxidation product ratio, the following Thermo-Calc thermodynamic calculations were performed:
1) Dew point temperature and partial pressure ratio P H2O /P H2 The relation between the two is shown in figure 1.
2) Oxygen content and partial pressure ratio P at 850 DEG C H2O /P H2 The relation between the two is shown in figure 2;
3) Oxygen content and oxidation product Fe at 850 DEG C 2 SiO 4 And SiO 2 The relation between the two is shown in figure 3.
Control of the proportion of the oxidation products is achieved by control of the dew point temperature, fe in the decarburized annealed sheet 2 SiO 4 /SiO 2 The proportion of the magnesium silicate is controlled to be 0.16-0.68, so that a good magnesium silicate bottom layer can be formed, and the defect of the dot dew substrate of the finished product plate is reduced.
(3) Nitriding and MgO-coated isolating agent
The decarburization annealing and the nitriding treatment are carried out on the same continuous furnace production line. The nitriding process comprises the following steps: at 6% NH 3 Dry 75% H 2 +N 2 Nitriding treatment was carried out at 770℃for 30 seconds in an atmosphere. The decarburization annealed sheet is nitrided and annealed and then coated with a MgO separating agent.
3. High-temperature annealing and subsequent processes
And (3) after high-temperature annealing, coating an insulating coating on the hot stretching leveling annealing line to prepare a finished product, and detecting the defects of the punctiform exposed substrate on the surface of the finished product plate.
2. Examples of the method for controlling the proportion of the oxidation product according to the present invention are compared with comparative examples
By comparing the ratios of the oxidation products corresponding to the decarburization annealing dew point temperatures, the effect on the substrate defects was compared. The results of comparison of examples and comparative examples are shown in Table 2.
Table 2 comparison of examples with comparative examples
From the comparison of table 2, it can be seen that: by adopting the method of the invention, fe generated by decarburization annealing can be controlled 2 SiO 4 And SiO 2 The ratio of the substrate to the magnesium silicate substrate can be effectively reduced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. A method for controlling the proportion of oxidation products of a decarburization annealing plate of Hi-B steel, which is characterized in that the relation between the dew point temperature of a decarburization annealing process and the proportion of the oxidation products is established through the hydrogen-water partial pressure ratio, the control of the proportion of the oxidation products of the decarburization annealing plate is realized through the control of the dew point temperature of the decarburization annealing, and the relation between the dew point temperature and the proportion of the oxidation products is established through the following relation;
1) Dew point temperature and partial pressure ratio P H2O /P H2 A relationship between;
2) Oxygen content and partial pressure ratio P at decarburization annealing temperature H2O /P H2 A relationship between; oxygen content and oxidation product Fe 2 SiO 4 And SiO 2 Relationship between them.
2. The method for controlling the oxidation product proportion of a Hi-B steel decarburization annealed sheet according to claim 1, wherein the Hi-B steel comprises the following chemical components in percentage by mass: c:0.043% -0.073%, si:2.60 to 3.80 percent of Mn:0.0018 to 0.0180 percent, S:0.002% -0.009%, P:0.0023% -0.0180%, als:0.009% -0.0750%, N:0.0023 to 0.0100 percent, and the balance of Fe and unavoidable impurities.
3. A method for controlling the oxidation product ratio of a decarburized annealed Hi-B steel sheet according to claim 1, wherein Fe is contained in the decarburized annealed sheet 2 SiO 4 /SiO 2 The ratio of (2) is controlled to be 0.16-0.68.
4. The method for controlling the oxidation product ratio of a decarburization annealed sheet of Hi-B steel according to claim 1, wherein the decarburization annealing atmosphere of the cold rolled sheet is: wet 75% H with a humidifying tank temperature in the range of 30-80 DEG C 2 +25％N 2 The method comprises the steps of carrying out a first treatment on the surface of the The decarburization annealing temperature is: 830-850 ℃; the decarburization annealing time is: 2-3 min.
5. The method for controlling the oxidation product ratio of a decarburized annealed Hi-B steel sheet according to claim 1, wherein the decarburization annealing and the nitriding treatment are carried out in the same continuous furnace line, and the nitriding process comprises: contains 2 to 15 percent of NH 3 Dry 75% H 2 +N 2 Nitriding treatment is carried out for 10-50 seconds at 700-810 ℃ in the atmosphere; the decarburization annealed sheet is nitrided and annealed and then coated with a MgO separating agent.
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| CN202310786138.8A CN116855877A (en) | 2023-06-29 | 2023-06-29 | Method for controlling oxidation product proportion of Hi-B steel decarburization annealing plate |
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