CN113073177A - Control method for improving components of oxidation layer of oriented steel - Google Patents
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
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Abstract
The invention discloses a control method for improving components of an oxidation layer of oriented steel, and belongs to the technical field of metallurgy. The control method comprises the steps of smelting, continuous casting, slab heating, hot rolling, normalizing cooling, cold rolling, continuous annealing, coating, sintering in a drying furnace, high-temperature annealing, hot stretching and leveling to obtain the finished oriented steel; the specific process parameters are as follows: and (3) continuous annealing: in N2+H2+H2Under the protection atmosphere of O, controlling the temperature to be 800-900 ℃, preserving the heat for 80-140 s, carrying out decarburization treatment, and continuing to perform decarburization treatment under the condition of N2+H2+H2In the protective atmosphere of O, controlling the temperature to 700-900 ℃, and preserving the heat for 10-40 s for nitriding treatment; sintering in a drying furnace: and an open fire type burner is adopted in the drying furnace, the temperature of the drying furnace is controlled to be 500-800 ℃, and the drying treatment is carried out for 15-25 s. The control method utilizes the high-temperature oxidation behavior of Fe in air or oxygen to make up for the oxide layer lost in the nitriding section by controlling the drying furnace process, so as to form a new and better oxide layer component and finally prepare a finished product with a good bottom layer.
Description
Technical Field
The invention relates to a production method of oriented silicon steel, belongs to the technical field of metallurgy, and particularly relates to a control method for improving components of an oxidation layer of oriented steel.
Background
The oriented silicon steel strip is normalized and rolled, after the decarburization and nitridation annealing process, in order to prevent the steel coil from bonding in high-temperature annealing, a MgO coating is coated on the surface of the steel strip, and then an oxidation layer on the surface of the silicon steel reacts with MgO coated on the surface of the silicon steel to generate Mg in the high-temperature annealing stage2SiO4The film is mainly an insulating film, and the film not only influences the final surface quality of the oriented silicon steel, but also influences the electrical insulation. Therefore, the formation of a reasonable oxide layer is critical to the quality of the underlying film formation.
Atmosphere in continuous annealing furnace, mainly N2、H2And H2Mixed gas atmosphere of O, wherein N is used in nitriding stage of continuous annealing2+H2Gas mixture gas with low partial pressure ratio and NH in the atmosphere during nitriding3H produced by decomposition2The nitriding zone is brought to a reducing atmosphere, and the strongly reducing atmosphere of the nitriding section destroys the original oxide layer components. Wherein the adverse factor to the underlying film is mainly H2The decomposition of FeO in the oxide layer leads to the destruction of a compact oxide layer formed in the decarburization process, and further causes poor quality of a bottom layer after high-temperature annealing.
Therefore, how to compensate for the loss of the oxide layer in the nitriding section, form a new and better oxide layer component, and finally obtain a good finished product at the bottom layer is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
In order to solve the technical problem, the invention discloses a control method for improving the components of an oxidation layer of oriented steel, which comprises the steps of controlling the process of a drying furnace, exploring a proper temperature range by utilizing the high-temperature oxidation behavior of Fe in air or oxygen, generating a required FeO component in the temperature range, making up for the loss of the oxidation layer at a nitriding section to form a new and better oxidation layer component, and finally obtaining a finished product with a good bottom layer.
In order to achieve the aim, the invention discloses a control method for improving the components of an oxide layer of oriented steel, which comprises the following steps of smelting, continuous casting, slab heating, hot rolling, normalizing cooling, cold rolling, continuous annealing, coating, sintering in a drying furnace, high-temperature annealing, hot stretching and leveling to prepare the finished oriented steel;
the specific process parameters are as follows:
and (3) continuous annealing: in N2+H2+H2Under the protection atmosphere of O, controlling the temperature to be 800-900 ℃, preserving the heat for 80-140 s, carrying out decarburization treatment, and continuing to perform decarburization treatment under the condition of N2+H2+H2In the protective atmosphere of O, controlling the temperature to 700-900 ℃, and preserving the heat for 10-40 s for nitriding treatment;
sintering in a drying furnace: an open fire type burner is adopted in the drying furnace, the temperature of the drying furnace is controlled to be 500-800 ℃, and the drying treatment is carried out for 15-25 s;
the molten steel in the smelting process comprises the following alloy components in percentage by mass:
si: 2.90-3.35%, C: 0.045-0.065%, Als: 0.015-0.045%, Mn: 0.06-0.12%, S: 0.003-0.020%, N: 0.003 to 0.010%, Cu: 0.01-0.015 percent of Cr and Ni, wherein the total content of Cr and Ni is less than 0.3 percent, and the balance of Fe and inevitable impurities.
Further, in the nitriding treatment stage, the partial pressure ratio P (H) between water vapor and hydrogen gas2O)/P(H2) 0.05 to 0.07.
Preferably, the nitriding treatment stage has a partial pressure ratio P (H) between water vapor and hydrogen2O)/P(H2) Is 0.06.
Further, in the decarbonization stage, the partial pressure ratio P (H) between the steam and the hydrogen is set2O)/P(H2)≤0.02。
Preferably, the nitriding treatment stage has a partial pressure ratio P (H) between water vapor and hydrogen2O)/P(H2) Is 0.01.
Further, the temperature of the drying furnace is controlled to be 650-750 ℃.
Further, in the smelting process, the molten steel comprises the following alloy components in percentage by mass:
si: 3.00-3.30%, C: 0.050 to 0.055%, Als: 0.015-0.045%, Mn: 0.08-0.10%, S: 0.003-0.020%, N: 0.003 to 0.010%, Cu: 0.01-0.015%, 0.1% < (Cr + Ni) < 0.25%, and the balance Fe and unavoidable impurities.
Further, the slab heating process includes heating the slab to 1250 ℃ or less and performing conventional hot rolling.
Further, the normalizing cooling process is conventional secondary normalizing cooling.
Further, the cold rolling process comprises cold rolling a steel strip to a thickness of < 0.3 mm.
Has the advantages that:
the invention designs a control method for improving components of an oxidation layer of oriented steel, which comprises the steps of setting a drying mode and a process of strong oxidation, and carrying out certain compensatory oxidation on an oxidation layer damaged by reducing atmosphere in a nitriding section in a drying section, so that the front and back oxygen contents of a steel strip are improved by about 50ppm, and a product superior to a bottom layer of a conventional drying process is prepared.
Drawings
FIG. 1 is a schematic view of the microstructure of a sample of an example;
fig. 2 is a schematic view of the microstructure of a comparative example sample.
Detailed Description
The invention discloses a control method for improving components of an oxidation layer of oriented steel, which comprises the following steps of smelting, continuous casting, slab heating, hot rolling, normalized cooling, cold rolling, continuous annealing, coating, sintering in a drying furnace, high-temperature annealing, hot stretching and flattening to obtain finished oriented steel;
the specific process parameters are as follows:
and (3) continuous annealing: in N2+H2+H2Under the protection atmosphere of O, controlling the temperature to be 800-900 ℃, preserving the heat for 80-140 s, carrying out decarburization treatment, and continuing to perform decarburization treatment under the condition of N2+H2+H2In the protective atmosphere of O, controlling the temperature to 700-900 ℃, and preserving the heat for 10-40 s for nitriding treatment;
sintering in a drying furnace: an open fire type burner is adopted in the drying furnace, the temperature of the drying furnace is controlled to be 500-800 ℃, and the drying treatment is carried out for 15-25 s;
the molten steel in the smelting process comprises the following alloy components in percentage by mass:
si: 2.90-3.35%, C: 0.045-0.065%, Als: 0.015-0.045%, Mn: 0.06-0.12%, S: 0.003-0.020%, N: 0.003 to 0.010%, Cu: 0.01-0.015 percent of Cr and Ni, wherein the total content of Cr and Ni is less than 0.3 percent, and the balance of Fe and inevitable impurities.
Further, in the nitriding treatment stage, the partial pressure ratio P (H) between water vapor and hydrogen gas2O)/P(H2) 0.05 to 0.07.
Further, in the decarbonization stage, the partial pressure ratio P (H) between the steam and the hydrogen is set2O)/P(H2)≤0.02。
Further, the temperature of the drying furnace is controlled to be 650-750 ℃.
Further, in the smelting process, the molten steel comprises the following alloy components in percentage by mass:
si: 3.00-3.30%, C: 0.050 to 0.055%, Als: 0.015-0.045%, Mn: 0.08-0.10%, S: 0.003-0.020%, N: 0.003 to 0.010%, Cu: 0.01-0.015%, 0.1% < (Cr + Ni) < 0.25%, and the balance Fe and unavoidable impurities.
Further, the slab heating process includes heating the slab to 1250 ℃ or less and performing conventional hot rolling.
Further, the normalizing cooling process is conventional secondary normalizing cooling.
Further, the cold rolling process comprises cold rolling a steel strip to a thickness of < 0.3 mm.
In order to better explain the present invention, the following detailed description is given in conjunction with specific examples.
The contents of the alloying elements and the preparation processes of the products of examples 1 to 7 and comparative examples 1 to 3 of the present invention are shown in tables 1 and 2.
TABLE 1 tabulated (wt%) alloying element contents for the products of examples 1-7 and comparative examples 1-3
TABLE 2 Process List of the products of examples 1-7 and comparative examples 1-3
Wherein, FIG. 1 shows the product obtained in example 1, FIG. 2 shows the product obtained in comparative example 3, the sample bottom layer can be found to be dense in FIG. 1, and the sample bottom layer can be found to be loose and have defects in FIG. 2.
As can be seen from tables 1 and 2, the drying process of the continuously annealed steel strip is controlled by the present invention, the temperature and the heating time are in the same range, and when the heating mode is non-open fire, the total oxygen content is low and the bottom layer defect ratio is high; when the same open fire heating mode is adopted and the temperature and the time are not in the interval of the invention, the total oxygen content is not ideal and the proportion of the bottom layer defects is high. In addition, by adopting the process control method, the electrical insulation can be stabilized to be more than 200 omega under the condition of ensuring better quality of the bottom layer.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A control method for improving the components of an oxide layer of oriented steel is characterized by comprising the following steps of smelting, continuous casting, slab heating, hot rolling, normalized cooling, cold rolling, continuous annealing, coating, sintering in a drying furnace, high-temperature annealing, hot stretching and flattening to obtain the finished oriented steel;
the specific process parameters are as follows:
and (3) continuous annealing: in N2+H2+H2Under the protection atmosphere of O, controlling the temperature to be 800-900 ℃, preserving the heat for 80-140 s, carrying out decarburization treatment, and continuing to perform decarburization treatment under the condition of N2+H2+H2In the protective atmosphere of O, controlling the temperature to 700-900 ℃, and preserving the heat for 10-40 s for nitriding treatment;
sintering in a drying furnace: an open fire type burner is adopted in the drying furnace, the temperature of the drying furnace is controlled to be 500-800 ℃, and the drying treatment is carried out for 15-25 s;
the molten steel in the smelting process comprises the following alloy components in percentage by mass:
si: 2.90-3.35%, C: 0.045-0.065%, Als: 0.015-0.045%, Mn: 0.06-0.12%, S: 0.003-0.020%, N: 0.003 to 0.010%, Cu: 0.01-0.015 percent of Cr and Ni, wherein the total content of Cr and Ni is less than 0.3 percent, and the balance of Fe and inevitable impurities.
2. The method for improving the control of the composition of the oxide layer of oriented steel as claimed in claim 1, wherein the nitriding treatment stage is carried out by using a partial pressure ratio P (H) between water vapor and hydrogen2O)/P(H2) 0.05 to 0.07.
3. The method for improving the control of the composition of an oxide layer of oriented steel according to claim 1, wherein the decarburization treatment stage is carried out at a partial pressure ratio P (H) between steam and hydrogen2O)/P(H2)≤0.02。
4. The method for improving the composition of the oxide layer of the oriented steel as claimed in claim 1, wherein the temperature of the drying furnace is controlled to be 650-750 ℃.
5. The method for improving the control of the composition of the oxide layer of the oriented steel according to claim 1, wherein the molten steel in the smelting process comprises the following alloy components in percentage by mass:
si: 3.00-3.30%, C: 0.050 to 0.055%, Als: 0.015-0.045%, Mn: 0.08-0.10%, S: 0.003-0.020%, N: 0.003 to 0.010%, Cu: 0.01-0.015%, 0.1% < (Cr + Ni) < 0.25%, and the balance Fe and unavoidable impurities.
6. The method for improving the control of the composition of the oxide layer of the oriented steel according to any one of claims 1 to 5, wherein the slab heating process comprises heating the slab to 1250 ℃ or below and performing conventional hot rolling.
7. The method for improving the control of the composition of the oxide layer of the oriented steel according to any one of claims 1 to 4, wherein the normalizing cooling process is conventional secondary normalizing cooling.
8. The method for improving the control of the composition of the oxide layer of the oriented steel according to any one of claims 1 to 4, wherein the cold rolling process comprises cold rolling a steel strip with the thickness of less than 0.3 mm.
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| CN108165876A (en) * | 2017-12-11 | 2018-06-15 | 鞍钢股份有限公司 | A kind of method for improving low temperature nitriding orientation silicon steel surface quality |
| CN110055393A (en) * | 2019-04-28 | 2019-07-26 | 首钢智新迁安电磁材料有限公司 | A kind of thin gauge low temperature high magnetic induction grain-oriented silicon steel strip production method |
| CN110791635A (en) * | 2019-09-30 | 2020-02-14 | 鞍钢股份有限公司 | Method for preparing high-magnetic-induction oriented silicon steel |
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