CN112301192A - Vertical annealing process of low-carbon-content cold-rolled non-oriented silicon steel galvanizing unit - Google Patents
Vertical annealing process of low-carbon-content cold-rolled non-oriented silicon steel galvanizing unit Download PDFInfo
- Publication number
- CN112301192A CN112301192A CN202011087526.XA CN202011087526A CN112301192A CN 112301192 A CN112301192 A CN 112301192A CN 202011087526 A CN202011087526 A CN 202011087526A CN 112301192 A CN112301192 A CN 112301192A
- Authority
- CN
- China
- Prior art keywords
- furnace
- section
- controlled
- vertical
- low
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- C21D1/26—Methods of annealing
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
The invention provides a vertical annealing process of a low-carbon cold-rolled non-oriented silicon steel galvanizing unit, which specifically comprises the following steps: the thickness of the strip steel is 0.5 mm; controlling the running speed of the strip steel to be 60-65 mpm; the tension in the vertical annealing furnace is 3-5N/mm2(ii) a The furnace temperature of each section is controlled as follows: the preheating section is 200-300 ℃, the heating section is 850-920 ℃, the soaking section is 850-920 ℃, the slow cooling section is 500-600 ℃, the fast cooling section is 200-250 ℃, and the equalizing section is 150-200 ℃; controlling the furnace pressure to be 40-45 Pa; the charging amount of the protective gas is controlled as follows: nitrogen gas 2000m3H, hydrogen 150m3H; controlling the concentration of hydrogen in the furnace to be 5%; the oxygen content in the furnace is controlled to be 20-30 ppm; the dew point in the furnace is controlled to be-50 to-55 ℃. After the annealing by the process, the low-temperature environment-friendly insulating coating is coated by a four-roller coating machine, and the finished product is dried and cured by a vertical drying furnace, so that the performance of the finished product of each brand can meet the requirementsAnd meeting the enterprise standard. The process of the invention can not only ensure the flatness of the steel strip and ensure the magnetic property, the magnetic aging and the like of the steel strip to meet the technical requirements, but also improve the product percent of pass, reduce waste products and ensure the smooth production.
Description
Technical Field
The invention belongs to an annealing technology, and particularly relates to a process for annealing low-carbon-content cold-rolled non-oriented silicon steel by a galvanizing unit vertical annealing furnace.
Background
The content of C in the cold-rolled non-oriented silicon steel finished product is required to be less than or equal to 0.003 percent, because carbon is an extremely harmful element and forms a gap solid solution with iron, the crystal lattice is seriously distorted to cause great internal stress, so that the magnetism is reduced, the iron loss value is increased, and the serious magnetic aging is generated.
Therefore, the content of C in the hot-rolled coil which is used as the raw material of the non-oriented silicon steel is required to be less than or equal to 0.005 percent conventionally, so as to ensure that the content of C is reduced to be less than or equal to 0.003 percent in the continuous decarburization annealing process of a horizontal unit after the cold rolling of the non-oriented silicon steel is carried out, and thus the performance of the finished cold-rolled non-oriented silicon steel is ensured.
With the rapid development of smelting technology, most of the existing large and medium-sized steel enterprise non-oriented silicon steel smelting processes can directly reduce the C content of a raw material coil to be below 0.003 percent, and after cold rolling, the non-oriented silicon steel can be used in a horizontal unit continuous decarburization annealing process without a decarburization function, so that recrystallization annealing can be directly completed.
At present, non-oriented silicon steel is produced at home and abroad on a horizontal unit, and an annealing furnace is horizontal and is provided with a special insulating coating machine and a horizontal drying furnace. In addition, the production technology of the non-oriented silicon steel is complex and difficult, the newly-built non-oriented silicon steel project has large investment, long period and long debugging period, and certain investment risk exists.
Disclosure of Invention
The invention aims to provide a vertical annealing process of a low-carbon cold-rolled non-oriented silicon steel galvanizing unit, which is used for realizing the purpose of producing cold-rolled non-oriented silicon steel products in the vertical galvanizing unit by rolling through a pickling and rolling mill combined unit under the condition that the content of C in a hot-rolled coil of a cold-rolled raw material is less than or equal to 0.003 percent. When the invention is used for producing non-oriented silicon steel products, the compatible function of the vertical galvanizing unit is fully exerted, the investment is saved, the risk is reduced, the requirement of developing and producing cold-rolled non-oriented silicon steel is met, and the invention creates a precedent for success of domestic and foreign industries.
In order to achieve the purpose, the invention adopts the technical scheme that:
a vertical annealing process of a low-carbon cold-rolled non-oriented silicon steel galvanizing unit adopts the vertical galvanizing unit to anneal the low-carbon cold-rolled non-oriented silicon steel, and specifically comprises the following steps:
(1) the thickness of the strip steel is 0.5 mm;
(2) controlling the running speed of the strip steel to be 60-65 mpm;
(3) controlling the internal tension of the vertical annealing furnace;
(4) the furnace temperature of each section is controlled as follows: the preheating section is 200-300 ℃, the heating section is 850-920 ℃, the soaking section is 850-920 ℃, the slow cooling section is 500-600 ℃, the fast cooling section is 200-250 ℃, and the equalizing section is 150-200 ℃;
(5) controlling the furnace pressure to be 40-45 Pa;
(6) the charging amount of the protective gas is controlled as follows: nitrogen gas 2000m3H, hydrogen 150m3/h;
(7) Controlling the concentration of hydrogen in the furnace to be 5%;
(8) the oxygen content in the furnace is controlled to be 20-30 ppm;
(9) the dew point in the furnace is controlled to be-50 to-55 ℃.
Further, the tension control in the vertical annealing furnace is 3-5N/mm2。
The process design reason of the invention is as follows:
the steel coil is rapidly heated to an alpha-phase region under the condition of hydrogen and nitrogen mixed gas (the content of hydrogen in the furnace is 5 vol%) for recrystallization annealing. The annealing temperature, the annealing time and the dew point in the furnace can directly influence the size of crystal grains, and the atmosphere contains a certain amount of hydrogen to ensure the reducibility in the furnace and ensure the brightness of the strip steel. The lower the annealing temperature is, the smaller the average grain size after annealing is, the larger the iron loss is, and the higher the magnetic induction intensity is; the higher the annealing temperature, the larger the average grain size after annealing, the smaller the iron loss, and the larger the magnetic induction.
When the annealing speed is properly low, the average grain size after annealing is small and increased, the magnetic performance can be improved in a small range, but energy is wasted due to too low speed, and the cost is increased.
The control of the tension in the vertical annealing furnace can ensure good plate shape and also ensure excellent magnetic performance. The strip steel in the furnace can be deviated due to too small tension, and even the furnace can be shut down; the excessive tension can cause the iron loss to be increased, the magnetic induction to be reduced, and even the belt breakage accident in the furnace can happen.
Compared with the prior art, the invention has the beneficial effects that: the vertical annealing process is simple and reasonable, and convenient to operate, when the vertical galvanizing unit is adopted to produce the non-oriented silicon steel coil with low carbon content and carbon content less than or equal to 0.003 percent, after the annealing process, the low-temperature environment-friendly insulating coating is coated by the four-roller coating machine, and the drying and curing are carried out in the vertical drying furnace, so that the performances of middle and low-grade finished products can meet the enterprise standards. The process of the invention can not only ensure the flatness of the steel strip and ensure the magnetic property, the magnetic aging and the like of the steel strip to meet the technical requirements, but also improve the product percent of pass, reduce waste products and ensure the smooth production.
Drawings
FIG. 1 is a schematic view of a vertical galvanizing unit according to the invention;
in the figure: 1. the method comprises the steps of preheating section of the vertical annealing furnace, heating section of the vertical annealing furnace 2, soaking section of the vertical annealing furnace 3, slow cooling section of the vertical annealing furnace 4, quick cooling section of the vertical annealing furnace 5, equalizing section of the vertical annealing furnace 6, coating machine 7, drying furnace 8.
Detailed Description
The technical solutions and effects of the present invention will be further described with reference to the drawings and specific embodiments, but the scope of the present invention is not limited thereto.
The vertical annealing process of the low-carbon cold-rolled non-oriented silicon steel is completed in a vertical galvanizing unit, and the specific flow is shown in figure 1. The content of C is less than or equal to 0.003 percent, a cold-rolled steel coil with the thickness of 0.5mm sequentially passes through a preheating section 1 of a vertical annealing furnace, a heating section 2 of the vertical annealing furnace, a soaking section 3 of the vertical annealing furnace, a slow cooling section 4 of the vertical annealing furnace, a fast cooling section 5 of the vertical annealing furnace, a balancing section 6 of the vertical annealing furnace, a coating machine 7 and a drying furnace 8, and after recrystallization annealing, insulating layer coating and coating drying and solidification, the magnetic performance meets the enterprise standard. The vertical annealing process and the finished product performance of the embodiment of the invention are shown in the table 1, and the conventional horizontal annealing process and the finished product performance are shown in the table 2.
Table 1 vertical annealing process and finished product performance of embodiments of the invention
Examples | 1 | 2 |
Steel grade brand | 50W800 | 50W470 |
Strip steel specification | 0.5×1200mm | 0.5×1200mm |
C content before annealing | 29ppm | 28ppm |
Speed of the machine | 60mpm | 65mpm |
Tension in furnace | 5N/mm2 | 4N/mm2 |
Preheating section furnace temperature | 200~250℃ | 250~300℃ |
Furnace temperature of heating section | 850~890℃ | 890~920℃ |
Furnace temperature of soaking zone | 850~890℃ | 890~920℃ |
Furnace temperature of slow cooling section | 500~550℃ | 550~600℃ |
Furnace temperature of rapid cooling section | 230~250℃ | 200~230℃ |
Furnace temperature of equalizing section | 150~180℃ | 180~200℃ |
Furnace pressure | 40~42Pa | 42~45Pa |
Protective atmosphere in the furnace | Nitrogen and hydrogen | Nitrogen and hydrogen |
Amount of nitrogen charged into furnace | 2000m3/h | 2000m3/h |
Amount of hydrogen charged into furnace | 150m3/h | 150m3/h |
Hydrogen content in furnace | 5% | 5% |
Oxygen content in the furnace | 25~30ppm | 20~25ppm |
Dew point in furnace | -50~-52℃ | -52~-55℃ |
Iron loss value of finished product | P1.5 is 4.5W/kg | P1.5 is 4.0W/kg |
Magnetic induction value of finished product | B5000 is 1.70T | B5000 is 1.64T |
TABLE 2 conventional horizontal annealing Process and finished product Properties
Examples | 1 | 2 |
Steel grade brand | 50W800 | 50W470 |
Strip steel specification | 0.5×1200mm | 0.5×1200mm |
C content before annealing | 29ppm | 28ppm |
Speed of the machine | 90—110mpm | 90—110mpm |
Tension in furnace | 3N/mm2 | 3N/mm2 |
Preheating section furnace temperature | 800~900℃ | 850~950℃ |
Non-oxidation heating section furnace temperature | 1000~1050℃ | 1050~1100℃ |
Furnace temperature of heating section of radiant tube | 860~910℃ | 910~950℃ |
Furnace temperature of soaking zone | 860~910℃ | 910~950℃ |
Furnace temperature of rapid cooling section | 200~350℃ | 220~380℃ |
Final cooling zone furnace temperature | 100~150℃ | 100~150℃ |
Furnace pressure | 10~15Pa | 10~15Pa |
Protective atmosphere in the furnace | Nitrogen and hydrogen | Nitrogen and hydrogen |
Hydrogen content in furnace | 5% | 5% |
Oxygen content in the furnace | 10~20ppm | 10~20ppm |
Dew point in furnace | -20~-30℃ | -20~-30℃ |
Iron loss value of finished product | P1.5 is 4.6W/kg | P1.5 is 4.1W/kg |
Magnetic induction value of finished product | B5000 is 1.70T | B5000 is 1.64T |
The vertical annealing process is simple and reasonable, and convenient to operate, when the vertical galvanizing unit is adopted to produce the non-oriented silicon steel coil with low carbon content and carbon content less than or equal to 0.003 percent, after the annealing process, the low-temperature environment-friendly insulating coating is coated by the four-roller coating machine, and the non-oriented silicon steel coil is dried and cured by the vertical drying furnace, so that the performance of the finished product of each brand can meet the enterprise standard. The process of the invention can not only ensure the flatness of the steel strip and ensure the magnetic property, the magnetic aging and the like of the steel strip to meet the technical requirements, but also improve the product percent of pass, reduce waste products and ensure the smooth production.
Finally, it should be noted that the above-mentioned description is only for illustrating the technical solution of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solution of the present invention by those skilled in the art should be covered in the scope of the claims of the present invention as long as they do not depart from the spirit of the technical solution of the present invention.
Claims (2)
1. A vertical annealing process of a low-carbon-content cold-rolled non-oriented silicon steel galvanizing unit is characterized in that the process adopts the vertical galvanizing unit to anneal the low-carbon-content cold-rolled non-oriented silicon steel, and specifically comprises the following steps:
(1) the thickness of the strip steel is 0.5 mm;
(2) controlling the running speed of the strip steel to be 60-65 mpm;
(3) controlling the internal tension of the vertical annealing furnace;
(4) the furnace temperature of each section is controlled as follows: the preheating section is 200-300 ℃, the heating section is 850-920 ℃, the soaking section is 850-920 ℃, the slow cooling section is 500-600 ℃, the fast cooling section is 200-250 ℃, and the equalizing section is 150-200 ℃;
(5) controlling the furnace pressure to be 40-45 Pa;
(6) the charging amount of the protective gas is controlled as follows: nitrogen gas 2000m3H, hydrogen 150m3/h;
(7) Controlling the concentration of hydrogen in the furnace to be 5%;
(8) the oxygen content in the furnace is controlled to be 20-30 ppm;
(9) the dew point in the furnace is controlled to be-50 to-55 ℃.
2. The vertical annealing process of the low-carbon-content cold-rolled non-oriented silicon steel galvanizing unit according to claim 1, wherein the tension in the vertical annealing furnace is controlled to be 3-5N/mm2。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202011087526.XA CN112301192B (en) | 2020-10-13 | 2020-10-13 | Vertical annealing process of low-carbon-content cold-rolled non-oriented silicon steel galvanizing unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202011087526.XA CN112301192B (en) | 2020-10-13 | 2020-10-13 | Vertical annealing process of low-carbon-content cold-rolled non-oriented silicon steel galvanizing unit |
Publications (2)
Publication Number | Publication Date |
---|---|
CN112301192A true CN112301192A (en) | 2021-02-02 |
CN112301192B CN112301192B (en) | 2022-08-09 |
Family
ID=74489772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202011087526.XA Active CN112301192B (en) | 2020-10-13 | 2020-10-13 | Vertical annealing process of low-carbon-content cold-rolled non-oriented silicon steel galvanizing unit |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN112301192B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114645202A (en) * | 2022-03-14 | 2022-06-21 | 安阳钢铁集团有限责任公司 | Method for obtaining high-orientation-degree GOSS texture Fe-3% Si material |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61119620A (en) * | 1984-11-14 | 1986-06-06 | Kawasaki Steel Corp | Annealing method of silicon steel strip by vertical continuous annealing furnace |
JPH01234524A (en) * | 1988-03-11 | 1989-09-19 | Nkk Corp | Continuous annealing method for non-oriented silicon steel sheet |
JPH11229035A (en) * | 1998-02-13 | 1999-08-24 | Nkk Corp | Production of non-oriented silicon steel sheet excellent in surface property and core loss characteristic and non-oriented silicon steel sheet excellent in surface property and core loss characteristic |
WO2013095006A1 (en) * | 2011-12-20 | 2013-06-27 | 주식회사 포스코 | High silicon steel sheet having excellent productivity and magnetic properties and method for manufacturing same |
CN103882192A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Annealing method of high-interlayer resistance cold-rolled non-oriented electrical steel |
CN103882193A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Annealing method of cold-rolled non-oriented electrical steel with outer layer oxidized |
-
2020
- 2020-10-13 CN CN202011087526.XA patent/CN112301192B/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61119620A (en) * | 1984-11-14 | 1986-06-06 | Kawasaki Steel Corp | Annealing method of silicon steel strip by vertical continuous annealing furnace |
JPH01234524A (en) * | 1988-03-11 | 1989-09-19 | Nkk Corp | Continuous annealing method for non-oriented silicon steel sheet |
JPH11229035A (en) * | 1998-02-13 | 1999-08-24 | Nkk Corp | Production of non-oriented silicon steel sheet excellent in surface property and core loss characteristic and non-oriented silicon steel sheet excellent in surface property and core loss characteristic |
WO2013095006A1 (en) * | 2011-12-20 | 2013-06-27 | 주식회사 포스코 | High silicon steel sheet having excellent productivity and magnetic properties and method for manufacturing same |
CN103882192A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Annealing method of high-interlayer resistance cold-rolled non-oriented electrical steel |
CN103882193A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Annealing method of cold-rolled non-oriented electrical steel with outer layer oxidized |
Non-Patent Citations (1)
Title |
---|
***: "《板带冷轧机板形控制与机型选择》", 31 August 2007, 冶金工业出版社 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114645202A (en) * | 2022-03-14 | 2022-06-21 | 安阳钢铁集团有限责任公司 | Method for obtaining high-orientation-degree GOSS texture Fe-3% Si material |
Also Published As
Publication number | Publication date |
---|---|
CN112301192B (en) | 2022-08-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN102268516B (en) | Decarburization annealing process for high-carbon-content medium-low-grade cold-rolled non-oriented silicon steel | |
CN100381598C (en) | Orientating silicon steel, manufacturing process and equipment | |
CN102758127B (en) | Method for producing high magnetic induction orientation silicon steel with excellent magnetic performance and good bottom layer | |
CN102041440B (en) | Method for producing high magnetic induction grain-oriented silicon steel | |
CN102560235B (en) | Manufacturing method of high-magnetic-induction oriented silicon steel | |
CN103255274B (en) | Production method of general oriented silicon steel with twice cold rolling changed into one time cold rolling | |
CN104762551B (en) | Manufacturing method of thin-strip continuous casting high-magnetic-induction non-oriented silicon steel | |
CN101768697A (en) | Method for manufacturing oriented silicon steel with one-step cold rolling method | |
CN102127709A (en) | Low-temperature slab heating high magnetic induction grain-oriented silicon steel and production method thereof | |
CN111304518B (en) | Non-oriented electrical steel for variable frequency air conditioner and manufacturing method thereof | |
CN110117755B (en) | Preparation method of 980 MPa-grade cold-rolled medium manganese steel with low yield ratio | |
CN103572157A (en) | Production method for improving insulating property by adding trace elements in oriented silicon steel barrier-coat | |
CN113817967A (en) | Hot-delivery hot-charging production method for reducing depth of decarburized layer of bearing steel round steel | |
CN111996353A (en) | High-efficiency production method of electrical steel | |
CN112301192B (en) | Vertical annealing process of low-carbon-content cold-rolled non-oriented silicon steel galvanizing unit | |
CN114645207A (en) | Manufacturing method of acquired inhibitor high-magnetic-induction oriented silicon steel | |
CN111334648A (en) | Method for preventing ultrathin IF steel of continuous annealing unit from wrinkling | |
CN105219929B (en) | The segmented restoring method of hot rolled plate scale on surface | |
CN117488022A (en) | Control method for annealing process of high-grade non-oriented silicon steel | |
CN102560236B (en) | Preparation method of common oriented silicon steel | |
CN102534364B (en) | Production method for improving magnetic property of common oriented silicon steel | |
CN108165876B (en) | Method for improving surface quality of low-temperature nitriding oriented silicon steel | |
CN112626447A (en) | Atmosphere control process of high-magnetic-induction oriented silicon steel with excellent magnetism | |
CN103526000A (en) | Preparation method of low-carbon high-manganese oriented silicon steel sheet | |
CN115478145B (en) | Method for improving magnetic uniformity and production efficiency of oriented silicon steel |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
TA01 | Transfer of patent application right | ||
TA01 | Transfer of patent application right |
Effective date of registration: 20210312 Address after: 455004 meiyuanzhuang, Yindu District, Anyang City, Henan Province Applicant after: ANYANG IRON & STEEL Co.,Ltd. Applicant after: Angang Group cold rolling Co.,Ltd. Address before: 455004 meiyuanzhuang, Yindu District, Anyang City, Henan Province Applicant before: ANYANG IRON & STEEL Co.,Ltd. |
|
GR01 | Patent grant | ||
GR01 | Patent grant |