CN109554525A - A kind of manufacturing method of mirror surface-oriented silicon steel - Google Patents
A kind of manufacturing method of mirror surface-oriented silicon steel Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
The invention discloses a kind of manufacturing methods of mirror surface-oriented silicon steel, comprising: smelts to molten iron, in smelting process, one of addition Sb, Sn, P, Cu, Bi or multiple element, molten steel obtain slab after refining and casting；By the heating of plate blank to after 1320 DEG C~1400 DEG C, hot rolling is carried out to the slab, hot rolled plate is made；Normalizing treatment is carried out to the hot rolled plate；Cold rolling is carried out to the hot rolled plate after normalizing treatment, cold-reduced sheet is made；Decarburizing annealing is carried out to the cold-reduced sheet, when carrying out decarburizing annealing, the carbon content in the cold-reduced sheet is reduced to 30ppm hereinafter, forming SiO in the cold rolling plate surface simultaneously2Oxide layer controls the cold-reduced sheet oxygen adhesion amount less than 500ppm, and the control recovery time is greater than 100 seconds；Using magnesia as interleaving agent, annealing is dried to the cold-reduced sheet after decarburizing annealing；The cold-reduced sheet after drying and annealing is risen into 1170~1250 DEG C of progress high annealings with preset heating rate.
Description
Technical field
The present invention relates to steelmaking technical field more particularly to a kind of manufacturing methods of mirror surface-oriented silicon steel.
Background technique
Orientation silicon steel is electric power, electrician, essential energy-saving magnetic material in Electronic Industry, mainly for the manufacture of
Various power transformers, distribution transformer and Generator Stator.
Tradition directed silicon steel, will also be in H after hot rolling, normalizing and cold-rolling treatment2-N2-H2It is carried out under O atmosphere protection
Decarburizing annealing, by carbon content control in steel band in 30ppm hereinafter, to prevent production board from magnetic aging occurs.Decarburizing annealing simultaneously
The rolling stress of cold rolling generation is eliminated, primary recrystallization is formed.Steel strip surface can aoxidize when decarburizing annealing, formed with
SiO2And Fe2SiO4Based on oxide layer, further decarburization is adversely affected.In the annular furnace high annealing mistake of rear process
Cheng Zhong, the annealing separating agent MgO that oxide layer is coated with steel strip surface are chemically reacted, and are generated with Mg2SiO4Based on (magnesium silicate)
Glass bottom, which can prevent steel band from bonding in high annealing.
The magnesium silicate bottom hardness that orientation silicon steel surface is formed is high, and mold can be seriously worn in when punching, and punching burr is higher.
Generally the orientation silicon steel punching with magnesium silicate bottom only has 3000~6000 times.Orientation silicon steel fabric is by surface pantostrat
With the discrete oxide composition of insertion near surface, this structure of bottom has pinning effect to magnetic domain, magnetic domain movement is hindered to make iron
Damage increases.
In order to improve orientation silicon steel punching processing performance and further increase magnetic property, has exploitation both at home and abroad at present without silicon
Technology in terms of the mirror surface-oriented silicon steel of sour magnesium glass bottom.The production of these technologies is main without magnesium silicate bottom mirror surface-oriented silicon steel
A part of alkaline earth metal chloride, oxide etc. are added by change annealing separating agent type or in conventional annealing interleaving agent
To realize.Using novel annealing separating agent, there are coating process complexity, the disadvantages of being unevenly coated, into conventional annealing separating agent
Mirror surface-oriented silicon steel is obtained although adding new additive and bottom can be prevented to generate or eliminate embedded oxide, agent of annealing
In new additive will affect secondary recrystallization stability and steel purification effect, have an impact to the magnetic property of final finished.
Summary of the invention
For the above problem present in the production of existing mirror surface-oriented silicon steel, the present invention uses conventional annealing interleaving agent MgO,
The problems such as uniform coating process of annealing separating agent crawling is complicated is avoided, does not also add alkaline earth metal chloride, oxide
Equal additives, in order to avoid influence secondary recrystallization stability and steel purification effect.By smelting process add Sb, Sn, P, Cu,
Bi etc. is one such or a variety of, controls decarburizing annealing process surface of steel plate oxygen adhesion amount and recovery time, is coated with conventional high temperature
Annealing separating agent MgO can stablize after high annealing and obtain that magnetic property is excellent, mirror surface-oriented silicon steel without magnesium silicate bottom.
This application provides a kind of manufacturing methods of mirror surface-oriented silicon steel, comprising:
Molten iron is smelted, in smelting process, one of addition Sb, Sn, P, Cu, Bi or multiple element, molten steel
After refining and casting, slab is obtained；
By the heating of plate blank to after 1320 DEG C~1400 DEG C, hot rolling is carried out to the slab, hot rolled plate is made；
Normalizing treatment is carried out to the hot rolled plate；
Cold rolling is carried out to the hot rolled plate after normalizing treatment, cold-reduced sheet is made；
Decarburizing annealing is carried out to the cold-reduced sheet, when carrying out decarburizing annealing, the carbon content in the cold-reduced sheet is reduced
To 30ppm hereinafter, forming SiO in the cold rolling plate surface simultaneously2Oxide layer controls the cold-reduced sheet oxygen adhesion amount and is less than
500ppm, control recovery time are greater than 100 seconds；
Using magnesia as interleaving agent, annealing is dried to the cold-reduced sheet after decarburizing annealing；
The cold-reduced sheet after drying and annealing is risen to 1170~1250 DEG C of progress high temperature with preset heating rate to move back
Fire.
It is preferably, described that molten iron is smelted, comprising:
The molten iron is put into converter or electric furnace and is smelted.
Preferably, when carrying out hot rolling to the slab, control roughing end temp is not less than 1200 DEG C, and control finish rolling is opened
Temperature is rolled not less than 1000 DEG C.
Preferably, when the hot rolled plate carries out normalizing treatment, normalizing temperature is controlled at 900 DEG C~1200 DEG C, normalizing
Between 1 minute~3 minutes.
Preferably, before carrying out cold rolling to the hot rolled plate Jing Guo normalizing treatment, further includes:
Pickling is carried out to the hot rolled plate Jing Guo normalizing treatment.
Preferably, when carrying out cold rolling to the hot rolled plate Jing Guo normalizing treatment, with two once or with intermediate annealing
The secondary above cold rolling process is rolled into the cold-reduced sheet of 0.20mm~0.35mm, controls final reduction ratio 82% or more.
Preferably, when setting progress decarburizing annealing to the cold-reduced sheet, used protective gas is by H2、N2、H2O group
At mixed gas.
Preferably, the cold-reduced sheet by after drying and annealing rises to 1170~1250 DEG C with preset heating rate
Carry out high annealing, comprising:
In annular furnace or bell furnace, 1170~1250 DEG C are risen to the heating rate of 15~20 DEG C/h and is moved back to by drying
Cold-reduced sheet after fire carries out high annealing, wherein when carrying out high annealing, used protection air lift is by H2And N2Composition
Mixed gas, wherein hydrogen content be 25%~100%.
Preferably, 1170~1250 are risen to preset heating rate in the cold-reduced sheet by after drying and annealing
DEG C carry out high annealing after, further includes:
Steel band after coming out of the stove will be carried out stretching and smooth annealing, the temperature for controlling smooth annealing are no more than 800 DEG C.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
Since smelting process is added to the one or more of the elements such as Sb, Sn, P, Cu, Bi in the present invention, these elements exist
Decarburizing annealing process inhibits oxidation and changes oxide layer structure.Using conventional magnesia interleaving agent, it is warming up to 900 DEG C~1100
DEG C pass through SiO in MgO and surface film oxide2Chemically reactive forms Mg2SiO4(magnesium silicate or forsterite) bottom, can be every
It is contacted from inhibitor with protective atmosphere, avoids the excessively precured decomposition of inhibitor.Due to generation magnesium silicate underlayer thickness 1 μm with
Under, the later period, the elements such as Sb, Sn, P, Cu, Bi are largely enriched in substrate surface and part is the bottom of to the raising of high temperature anneal temperature
Layer diffusion is overflowed, and the relatively thin magnesium silicate bottom formed to early period erodes removal, and it is stable and excellent may finally to obtain magnetic property
Mirror surface-oriented silicon steel product different, without magnesium silicate bottom.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, for this
For the those of ordinary skill of field, without creative efforts, it can also be obtained according to these attached drawings others
Attached drawing.
Fig. 1 is a kind of flow chart of the manufacturing method of mirror surface-oriented silicon steel in the embodiment of the present application.
Specific embodiment
For the above problem present in the production of existing mirror surface-oriented silicon steel, the present invention uses conventional annealing interleaving agent MgO,
The problems such as uniform coating process of annealing separating agent crawling is complicated is avoided, does not also add alkaline earth metal chloride, oxide
Equal additives, in order to avoid influence secondary recrystallization stability and steel purification effect.By smelting process add Sb, Sn, P, Cu,
Bi etc. is one such or a variety of, controls decarburizing annealing process surface of steel plate oxygen adhesion amount and recovery time, is coated with conventional high temperature
Annealing separating agent MgO can stablize after high annealing and obtain that magnetic property is excellent, mirror surface-oriented silicon steel without magnesium silicate bottom.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
Embodiment one
As shown in Figure 1, present embodiments providing a kind of manufacturing method of mirror surface-oriented silicon steel, comprising:
Step S101: smelting molten iron, in smelting process, addition Sb (antimony), Sn (tin), P (phosphorus), Cu (copper),
One of Bi (bismuth) or multiple element, molten steel obtain slab after refining and casting.
In the specific implementation process, when being smelted to molten iron, molten iron can be put into converter or electric furnace and carries out smelting
Refining, is smelted by converter or electric furnace.
In the specific implementation process, when carrying out hot rolling to slab, control roughing end temp is not less than 1200 DEG C of (examples
Such as: 1200 DEG C, 1250 DEG C, 1300 DEG C), control finish rolling start rolling temperature not less than 1000 DEG C (such as: 1000 DEG C, 1050
DEG C, 1100 DEG C, etc.).
Step S102: by heating of plate blank to after 1320 DEG C~1400 DEG C, hot rolling is carried out to slab, hot rolled plate is made.
Step S103: normalizing treatment is carried out to hot rolled plate.
In the specific implementation process, when hot rolled plate carries out normalizing treatment, normalizing temperature is controlled at 900 DEG C~1200 DEG C
(such as: 900 DEG C or 1000 DEG C or 1100 DEG C or 1200 DEG C, etc.), 1 minute~3 minutes normalizing time (such as: 1 minute,
Or 2 minutes.Or 3 minutes, etc.), normalizing treatment carries out pickling again.
Step S104: cold rolling is carried out to the hot rolled plate after normalizing treatment, cold-reduced sheet is made.
In the specific implementation process, when carrying out cold rolling, with cold rolling process more than two times primary or with intermediate annealing
Be rolled into the cold-reduced sheet of 0.20mm~0.35mm, it is desirable that final reduction ratio 82% or more (such as: 82% or 85% or
90%, etc.).
Step S105: decarburizing annealing: carrying out decarburizing annealing processing to cold-reduced sheet, when carrying out decarburizing annealing processing, annealing
Temperature control is 900 DEG C~1100 DEG C (such as: 900 DEG C or 1000 DEG C or 1100 DEG C, etc.), by the carbon content in cold-reduced sheet
30ppm is reduced to hereinafter, being formed simultaneously in cold rolling plate surface with SiO2(silica) oxide layer as main component controls cold
Plate oxygen adhesion amount is rolled less than 500ppm, and the control recovery time is greater than 100 seconds.
In the specific implementation process, when carrying out decarburizing annealing, used protective gas is by H2、N2, H2O composition
Mixed gas.
Due to being added to the one or more of the elements such as Sb, Sn, P, Cu, Bi in the present invention, during decarburizing annealing this
A little elements are enriched in surface of steel plate, on the one hand can be inhibited surface of steel plate oxidation reaction, on the other hand also be changed decarburizing annealing
Surface of steel plate SiO2 oxide layer structure.If steel plate oxygen adhesion amount is in 500ppm hereinafter, and extending decarburization after control decarburizing annealing
Recovery time afterwards is greater than 100 seconds.The SiO2 oxide layer of decarburizing annealing process formation and the interleaving agent MgO of coating in this way is in high temperature
Annealing forms the loose magnesium silicate bottom less than 1 μ m thick, work of the high annealing later period in elements such as Sb, Sn, P, Cu, Bi early period
With lower removal magnesium silicate bottom, the mirror surface-oriented silicon steel without magnesium silicate bottom is obtained.
Step S106: using magnesia as interleaving agent, annealing is dried to the cold-reduced sheet after decarburizing annealing.
In the specific implementation process, it can be coated with according to common process with magnesia interleaving agent as main component, go forward side by side
Row drying and annealing.
Step S107: the cold-reduced sheet after drying and annealing is risen into 1170~1250 DEG C of progress height with preset heating rate
Temperature annealing.
In the specific implementation process, it can be risen in annular furnace or bell furnace with the heating rate of 15~20 DEG C/h
1170~1250 DEG C carry out high annealing to the cold-reduced sheet after drying and annealing, wherein used when carrying out high annealing
Protection air lift be by H2And N2The mixed gas of composition, wherein hydrogen content is 25%~100%.
After step S107, further includes:
Steel band after coming out of the stove will be carried out stretching and smooth annealing, the temperature for controlling smooth annealing are no more than 800 DEG C.
Technical solution in above-mentioned the embodiment of the present application, at least have the following technical effects or advantages:
Since smelting process is added to the one or more of the elements such as Sb, Sn, P, Cu, Bi in the present invention, these elements exist
Decarburizing annealing process inhibits oxidation and changes oxide layer structure.Using conventional magnesia interleaving agent, it is warming up to 900 DEG C~1100
DEG C pass through SiO in MgO and surface film oxide2Chemically reactive forms Mg2SiO4(magnesium silicate or forsterite) bottom, can be every
It is contacted from inhibitor with protective atmosphere, avoids the excessively precured decomposition of inhibitor.Due to generation magnesium silicate underlayer thickness 1 μm with
Under, the later period, the elements such as Sb, Sn, P, Cu, Bi are largely enriched in substrate surface and part is the bottom of to the raising of high temperature anneal temperature
Layer diffusion is overflowed, and the relatively thin magnesium silicate bottom formed to early period erodes removal, and it is stable and excellent may finally to obtain magnetic property
Mirror surface-oriented silicon steel product different, without magnesium silicate bottom.
Embodiment two
With converter smelting orientation silicon steel, the chemical component (wt%) of slab are as follows: 0.072% C, 3.12% Si,
0.077% Mn, 0.022% S, 0.008% N, 0.145% Sn, 0.035% Cu, 0.0305% Als,
0.025% Cr, 0.016% P, 0.022% Sb, 0.0048% Bi etc., remaining ingredient are Fe and inevitably miscellaneous
Matter.
After slab heats at 1370 DEG C, it is rolled into the hot rolled plate of 2.3mm thickness.Hot rolled plate is through 1125 DEG C of normalizing annealings 1.5
After minute pickling and final thickness cold-reduced sheet is cold rolled in 840 DEG C of progress decarburizing annealing processing, surface of steel plate oxygen after decarburizing annealing
Adhesion amount and recovery time are as shown in table 1.Enter annular after being directly coated with the drying of regular oxidation magnesium interleaving agent without Nitrizing Treatment
Furnace high annealing.1190 DEG C are risen to the heating rate of 17 DEG C/h and keeps the temperature 25 hours, and hydrogen content is 75% in protective atmosphere.Out
800 DEG C of stretching and leveling annealing is carried out after annular furnace.
As shown in table 2, table 1 is the embodiment to rejection conditions, oxygen content, and alloy content is certain.
Table 1
Wherein, B800 and P17/50 is the important magnetic property index of orientation silicon steel.The magnetic strength of B800 expression orientation silicon steel.
P17/50 indicates the loss of orientation silicon steel under 50Hz.
Embodiment three
With converter smelting orientation silicon steel, slab composition and weight percentage are as follows: C:0.06%~0.10%, Si:2.9%
~3.3%, Mn:0.05%~0.10%, P:0.01~0.055%, S:0.01~0.03%, Als:0.02%~0.035%,
N:0.007%~0.010%, Cr:0.02%~0.4%, Sb:0.005%~0.065%, Sn:0.02%~0.2%, Cu:
0.03%~0.10%, Bi:0.001%~0.03%, etc., remaining be Fe and inevitable impurity.
After slab heats at 1370 DEG C, it is rolled into the hot rolled plate of 2.3mm thickness.Hot rolled plate is through 1125 DEG C of normalizing annealings 1.5
Pickling and final thickness is cold rolled to after minute.Cold-reduced sheet is in 840 DEG C of progress decarburizing annealings, and the recovery time is 130 seconds after decarburization, no
Enter annular furnace high annealing after Nitrizing Treatment is directly coated with the drying of regular oxidation magnesium interleaving agent.With the heating rate of 17 DEG C/h
It rises to 1190 DEG C and keeps the temperature 25 hours, hydrogen content is 75% in protective atmosphere.800 DEG C of stretching and leveling is carried out after annular furnace out to move back
Fire.
As shown in table 2, table 2 is the embodiment to alloy addition level in smelting process, and decarburization and oxygen content are certain.
Table 2
Above-described embodiment is only the best example, and is not the restriction to embodiment of the invention.
The magnesium silicate bottom hardness that tradition directed surface of silicon steel is formed is high, and mold, punching burr can be seriously worn in when punching
It is higher.Generally the orientation silicon steel punching with magnesium silicate bottom only has 3000~6000 times.Orientation silicon steel fabric is by surface
Pantostrat and the discrete oxide composition of insertion near surface, this structure of bottom have pinning effect to magnetic domain, magnetic domain are hindered to move
It is dynamic to increase iron loss.And mirror surface-oriented silicon steel can increase substantially the punching performance of orientation silicon steel, punching number can achieve
Tens of thousands of times or more, and pinned structure is eliminated in high-temperature annealing process, it is theoretically easier to obtain low iron loss product.
Before the present invention, the method for obtaining mirror surface-oriented silicon steel is mainly added chloride to conventional MgO interleaving agent and is made
With annealing separating agent Al novel (in background technique)2O3(aluminium oxide) or SiO2, both will cause magnetic property fluctuation, and new
Type annealing separating agent water solubility is poor, and coating process is complicated, it is difficult to which coating is uniform.
The one or more of the elements such as Sb, Sn, P, Cu, Bi are added in steel making working procedure in the invention patent creativeness, these
Element inhibits surface of steel plate to aoxidize and changes oxide layer structure during decarburizing annealing, and controls decarburizing annealing process steel plate table
Face oxygen adhesion amount is less than 500ppm and the recovery time is greater than 100 seconds.In elements such as high annealing stage Sb, Sn, P, Cu, Bi in base
Plate surface, which is enriched with when spreading and overflowing to bottom, corrodes magnesium silicate bottom to reach removal bottom purpose.This method is simple and easy,
It can stablize and obtain mirror surface-oriented silicon steel product.Produced on-site device therefor is the conventional production equipment of orientation silicon steel, is had
Good practicability and popularized type, thus there is good promotion prospect.
By the one or more of the elements such as steel-making addition Sb, Sn, P, Cu, Bi, rear process is according to conventional production process, work
Skill is simple and easy to control and at low cost.
Compared with the production of existing mirror surface-oriented silicon steel, this method inhibitor is more stable, it is easier to it is stable to obtain magnetic property
Mirror surface-oriented silicon steel.
Technical solution in above-mentioned the embodiment of the present application, at least have the following technical effects or advantages:
Since smelting process is added to the one or more of the elements such as Sb, Sn, P, Cu, Bi in the present invention, these elements exist
Decarburizing annealing process inhibits oxidation and changes oxide layer structure.Using conventional MgO interleaving agent, it is warming up to 900 DEG C~1100 DEG C
Pass through SiO in MgO and surface film oxide2Chemically reactive forms Mg2SiO4(magnesium silicate or forsterite) bottom, can isolate
Inhibitor is contacted with protective atmosphere, avoids the excessively precured decomposition of inhibitor.Due to generation magnesium silicate underlayer thickness 1 μm with
Under, the later period, the elements such as Sb, Sn, P, Cu, Bi are largely enriched in substrate surface and part is the bottom of to the raising of high temperature anneal temperature
Layer diffusion is overflowed, and the relatively thin magnesium silicate bottom formed to early period erodes removal, and it is stable and excellent may finally to obtain magnetic property
Mirror surface-oriented silicon steel product different, without magnesium silicate bottom.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of manufacturing method of mirror surface-oriented silicon steel characterized by comprising
Molten iron is smelted, in smelting process, one of addition Sb, Sn, P, Cu, Bi or multiple element, molten steel pass through
After refining and casting, slab is obtained；
By the heating of plate blank to after 1320 DEG C~1400 DEG C, hot rolling is carried out to the slab, hot rolled plate is made；
Normalizing treatment is carried out to the hot rolled plate；
Cold rolling is carried out to the hot rolled plate after normalizing treatment, cold-reduced sheet is made；
Decarburizing annealing is carried out to the cold-reduced sheet to be reduced to the carbon content in the cold-reduced sheet when carrying out decarburizing annealing
30ppm is hereinafter, form SiO in the cold rolling plate surface simultaneously2Oxide layer controls the cold-reduced sheet oxygen adhesion amount and is less than
500ppm, control recovery time are greater than 100 seconds；
Using magnesia as interleaving agent, annealing is dried to the cold-reduced sheet after decarburizing annealing；
The cold-reduced sheet after drying and annealing is risen into 1170~1250 DEG C of progress high annealings with preset heating rate.
2. the method as described in claim 1, which is characterized in that described to be smelted to molten iron, comprising:
The molten iron is put into converter or electric furnace and is smelted.
3. the method as described in claim 1, which is characterized in that when carrying out hot rolling to the slab, control roughing terminates temperature
Degree is not less than 1200 DEG C, and control finish rolling start rolling temperature is not less than 1000 DEG C.
4. the method as described in claim 1, which is characterized in that when the hot rolled plate carries out normalizing treatment, control normalizing temperature
Degree is at 900 DEG C~1200 DEG C, the normalizing time 1 minute~3 minutes.
5. the method as described in claim 1, which is characterized in that Jing Guo normalizing treatment the hot rolled plate carry out cold rolling it
Before, further includes:
Pickling is carried out to the hot rolled plate Jing Guo normalizing treatment.
6. the method as described in claim 1, which is characterized in that carrying out cold rolling to the hot rolled plate Jing Guo normalizing treatment
When, the cold-reduced sheet of 0.20mm~0.35mm is rolled into primary or with intermediate annealing cold rolling process more than two times, control is most
Whole reduction ratio is 82% or more.
7. the method as described in claim 1, which is characterized in that used when setting progress decarburizing annealing to the cold-reduced sheet
Protective gas be by H2、N2、H2The mixed gas of O composition.
8. the method as described in claim 1, which is characterized in that the cold-reduced sheet by after drying and annealing is with default
Heating rate rises to 1170~1250 DEG C of progress high annealings, comprising:
In annular furnace or bell furnace, 1170~1250 DEG C are risen to after drying and annealing with the heating rate of 15~20 DEG C/h
Cold-reduced sheet carry out high annealing, wherein when carrying out high annealing, used protection air lift is by H2And N2Composition mixes
Close gas, wherein hydrogen content is 25%~100%.
9. the method as described in claim 1, which is characterized in that in the cold-reduced sheet by after drying and annealing with pre-
If heating rate rises to after 1170~1250 DEG C of progress high annealings, further includes:
Steel band after coming out of the stove will be carried out stretching and smooth annealing, the temperature for controlling smooth annealing are no more than 800 DEG C.
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