CN107164692B - A method of the quick secondary recrystallization of orientation silicon steel based on thin band continuous casting technique - Google Patents
A method of the quick secondary recrystallization of orientation silicon steel based on thin band continuous casting technique Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
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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
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
- C21D8/1211—Rapid solidification; Thin strip casting
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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
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
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- C—CHEMISTRY; METALLURGY
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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
- 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
- C21D8/1272—Final recrystallisation annealing
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
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Abstract
The invention belongs to metallurgical technology field, more particularly to the method for the quick secondary recrystallization of a kind of orientation silicon steel based on thin band continuous casting technique.By ingredient C≤0.003%; Si 2.0~4.5%; Mn 0.1~0.25%; Al≤0.002%; S≤0.002%, N≤0.003%, the molten steel that surplus is Fe carry out Cast Strip preparation by rectilinear strip casting machine; it is 0.2~0.35mm, performance P that strip is cooling by jet, batch, thickness specification is obtained after the annealing of high temperature normalizing heat treatment, pickling and cold-rolling and quick secondary recrystallization17/50For 0.95~1.4W/kg, roll to magnetic strength B8For the finished product directional silicon steel of 1.82T or more.The present invention mainly uses low-level oxidation argon atmospher, high temperature long heat treatment that Cast Strip { 110 } is made to be orientated abnormal grain growth, and area fraction is 90% or more, after a stage cold rolling 70~80%, 950~1085 DEG C of heat preservation 10min complete quick secondary recrystallization.
Description
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of orientation silicon steel based on thin band continuous casting technique is quickly secondary
The method of recrystallization.
Background technology
Orientation silicon steel is mainly used for various transformers along fine magnetic property of the rolling direction with high magnetic strength, low iron loss
Iron core is indispensable important soft magnetic alloy in power electronics and war industry.Tradition directed silicon steel preparation process complexity is superfluous
Length includes mainly：Smelting-continuous casting-strand high-temperature heating-hot rolling-normalizing-cold rolling-decarburizing annealing-high annealing etc..
Wherein, secondary recrystallization annealing is a procedure most time-consuming in entire orientation silicon steel production procedure, enters high temperature from coil of strip and moves back
Stove is annealed to completion secondary recrystallization and purification and cooling is come out of the stove, and it is about 1 week to add up to total annealing time.As it can be seen that optimization is secondary
Recrystallization annealing process is to improve the most potential selection of orientation silicon steel production efficiency.Existing result of study shows that limitation is secondary
There are two the main reason for recrystallization annealing heating rate：1. high annealing generally uses bell-type annealing, coil of strip internal-external temperature difference ratio
It is larger, it is ensured that the uniformity of magnetic property is needed using slowly heating；2. the main purpose of high annealing is to ensure Goss crystal grain
Secondary recrystallization occurs, slowly heating advantageously reduces inhibitor roughening rate, expands and Goss crystal grain is suitble to selectively to grow up
Temperature range, reduce technique early period to the regulation and control difficulty of microstructure texture and inhibitor.
Twin-roll thin strip continuous casting technology fundamentally changes traditional Thin Strip Steel production method, can be not required to by continuous casting, add
Production processes such as heat, hot rolling and normalizing, but using two casting rolls of rotation as crystallizer, by liquid molten steel be directly injected into casting roll and
In the molten bath of side seal board composition, it is 1~6mm strips directly to produce thickness by liquid molten steel；Its process characteristic is liquid metal
Pressure processing and plastic deformation are born while crystallization and freezing, are completed in a short period of time from liquid metal to solid-state strip
All processes, greatly simplify production procedure.
Nippon patent (flat 2-258149,1990) is characterized mainly in that casting-milling technology parameter and cold-rolling process to taking
Influence to silicon-steel magnetic energy, the United States Patent (USP) (US6964711) of Italian Te Erni companies increase a time hot rolling technology
Its feature is in the influence with hot rolling technology to magnetic property.United States Patent (USP) (US6739384) main feature of Armco companies of the U.S. exists
Influence of the rate to magnetic property under to secondary cooling speed and stage cold rolling；Northeast China university patent (publication number CN
It 104294155A) is mainly characterized by ingredient preparing high magentic induction oriented silicon using Ultra-low carbon design and two benches cold-rolling process
Steel.These patents are all based on the orientation silicon steel of normal inhibitor ingredient, also need to carry out prolonged heat treated
Journey completes secondary recrystallization.
Japanese Laid-Open Patent Publication (publication number 2000-129353) discloses a kind of quick secondary recrystallization of no inhibitor
Method, but it controls thinking and is to obtain required Goss crystal grain seeds by the normalizing of old process and secondary cold-rolling.The U.S.
Patent (US Patent 2473156) discloses a kind of by the cold rolling of orientation silicon steel production board and continuous annealing acquisition Goss orientations
The method of the very thin silicon strip of crystal grain, technical points are closed by the particular inheritance in directional silicon steel cold rolling-annealing process
System obtains final goal tissue, its shortcoming is that cost of material is higher, and can only produce 0.10mm products below.
Invention content
For existing orientation silicon steel, the above problem, the present invention existing for preparation method and aspect of performance provide one kind and are based on
The method of the quick secondary recrystallization of orientation silicon steel of thin band continuous casting technique.By the unique deformation of double-roller rolling and solidification behavior,
Suitable heat treatment process is coordinated to obtain the stronger strip base of goss texture, it is secondary that cold rolling after annealing can be quickly obtained goss texture
Recrystallization.
The technical scheme is that：
A method of the quick secondary recrystallization of orientation silicon steel based on thin band continuous casting technique carries out according to the following steps：
(1) set component smelting molten steel is pressed, ingredient is by weight percentage：C≤0.003%, Si 2.0~4.5%,
Mn 0.1~0.25%, Al≤0.002%, S≤0.002%, N≤0.003%, surplus Fe；
(2) strip casting process：Molten steel is entered into tundish by cast gate, 1200~1250 DEG C of tundish preheating temperature,
The degree of superheat is 10~20 DEG C when control molten steel enters molten bath, and molten steel, which is entered by tundish after strip casting machine, forms Cast Strip, control
50~70m/min of teeming speed processed controls molten metal pool level 150~180mm of height, controls Cast Strip 1.0~2.0mm of thickness；
(3) it will be heat-treated in argon atmospher after the scale removal of Cast Strip, temperature is 1100~1200 DEG C, soaking time 10
~15h, dew point of atmosphere control is 10~20 DEG C, promotes { 110 } face abnormal grain growth；
(4) pickling Cast Strip after heat treatment directly carries out stage cold rolling, and cold roling reduction is 70~80%；
(5) cold-reduced sheet is annealed under the conditions of pure dry hydrogen, dew point of atmosphere≤- 30 DEG C, is directly warming up to 950~1085 DEG C of heat preservations
5~15min completes secondary recrystallization process.
The Cast Strip is gone out roller postcooling and is cooled down using argon gas, 50~70 DEG C/s of control cooling velocity.
The thin strap continuous casting is crossed by argon atmospher condition soak, and argon gas bulk purity is 99.9%.
{ 110 } orientation crystal grain ratio reaches 90% or more after the Cast Strip heat treatment.
The magnetic property of oriented silicon steel is：P17/50For 0.95~1.4W/kg, roll to magnetic strength B8For 1.82T or more.
The thickness of the cold-rolled strip and quick secondary recrystallization oriented silicon steel band is in 0.2~0.35mm.
Compared with prior art, advantages of the present invention and advantageous effect are：
The novelty of the present invention is utilize the controllable uniqueness of thin strap continuous casting silicon steel thin belt abnormal grain growth process tendency
Technology mechanism obtains specific { 110 } by Cast Strip heat treatment process<001>It is orientated crystal grain, then by cold rolling-annealing process
Genetic affinity obtain final sharp Goss texture, the present invention obtained using the special texture prepotency of strip casting process
Quick orientation silicon steel is obtained, greatly shortens orientation silicon steel preparation time, reduces orientation silicon steel manufacturing cost.Currently, there is no utilization
Thin strap continuous casting short route prepares the relevant report of the quick secondary recrystallization of no inhibitor.
Description of the drawings
Fig. 1 is the preparation of the quick secondary recrystallization of the orientation silicon steel based on strip continuous casting technology in the embodiment of the present invention
Method flow diagram.
Specific implementation mode
In specific implementation process, as shown in Figure 1, the present invention based on strip continuous casting technology Ultra-low carbon directional silicon steel
Preparation method flow includes casting → high temperature normalizing heat treatment → pickling and cold-rolling → quickly secondary recrystallization annealing, specific as follows：
Molten steel is entered into tundish, 1200~1250 DEG C of tundish preheating temperature by cast gate, molten steel enters strip by tundish and connects
Cast Strip is formed after casting machine, the control degree of superheat is 10 DEG C~20 DEG C, controls 50~70m/min of teeming speed, control molten metal pool level height 150
~180mm controls Cast Strip 1.0~1.5mm of thickness.It is kept the temperature in argon gas after the scale removal of Cast Strip, argon gas dew point control 10~
20 DEG C, soaking time is 10~15h, and temperature is 1100~1200 DEG C, promotes 110 face abnormal grain growths, such crystal grain ratio
Reach 90% or more.The hydrogen volume purity used in the embodiment of the present invention is 99.9%.
In the following, being further elaborated on to the present invention by embodiment.
Embodiment 1
In the present embodiment, the method for the quick secondary recrystallization of orientation silicon steel based on thin band continuous casting technique, according to the following steps
It carries out：
By set component smelting molten steel, ingredient is by mass percentage：C 0.002%, Si 4.0%, Mn 0.15%, Al
0.0012%, S 0.0015%, N 0.0025%, surplus Fe.Then preheated tundish is entered by cast gate, it is intermediate at this time
Packet preheating temperature is 1240 DEG C, and molten steel is entered by tundish in strip casting machine, and casting is at the Cast Strip of thickness 1.5mm, casting
The degree of superheat of control molten steel is 20 DEG C, teeming speed 60m/min in the process, molten metal pool level height 160mm.
Cast Strip is subjected to pickling and removes iron scale, heat preservation 15h obtains normalizing band, dew point 15 under the conditions of 1200 DEG C of argon gas
DEG C, promote { 110 } face abnormal grain growth, such crystal grain ratio to reach 93%；Normalizing band is directly subjected to pickling and cold-rolling, cold rolling
Reduction ratio 75%, cold rolling tape thickness are 0.35mm.
Under the conditions of pure dry hydrogen (- 30 DEG C of dew point of atmosphere), cold-rolled strip is directly warming up to 950 DEG C, keeps the temperature 10min, is carried out
Secondary recrystallization is annealed, and the quick secondary recrystallization oriented silicon steel band based on strip continuous casting technology, magnetic property P are obtained17/50For
1.3W/kg, magnetic strength B8For 1.82T.
Embodiment 2
In the present embodiment, the method for the quick secondary recrystallization of orientation silicon steel based on thin band continuous casting technique, according to the following steps
It carries out：
By set component smelting molten steel, ingredient is by mass percentage：C 0.0016%, Si 2.0%, Mn 0.13%,
Al 0.0017%, S 0.0013%, N 0.0021%, surplus Fe.Then preheated tundish is entered by cast gate, at this time
Tundish preheating temperature be 1230 DEG C, molten steel is entered by tundish in strip casting machine, casting at thickness 1.2mm Cast Strip,
The degree of superheat that molten steel is controlled in strip casting process is 15 DEG C, teeming speed 55m/min, molten metal pool level height 150mm.
Cast Strip is subjected to pickling and removes iron scale, 12h is kept the temperature under the conditions of argon gas (10 DEG C of dew points), 1200 DEG C and is obtained often
Change band, { 110 } face abnormal grain growth, such crystal grain ratio is promoted to reach 94%；Normalizing band is directly subjected to pickling and cold-rolling, it is cold
Reduction ratio 80% is rolled, cold rolling tape thickness is 0.25mm.
Under the conditions of pure dry hydrogen (- 35 DEG C of dew point of atmosphere), cold-rolled strip is directly warming up to 1000 DEG C, keeps the temperature 10min, is carried out
Secondary recrystallization is annealed, and the quick secondary recrystallization oriented silicon steel band based on strip continuous casting technology, magnetic property P are obtained17/50For
1.1W/kg, magnetic strength B8For 1.85T.
Embodiment 3
In the present embodiment, the method for the quick secondary recrystallization of orientation silicon steel based on thin band continuous casting technique, according to the following steps
It carries out：
By set component smelting molten steel, ingredient is by mass percentage：C 0.0011%, Si 2.8%, Mn 0.24%,
Al 0.0014%, S 0.0016%, N 0.0018%, surplus Fe.Then preheated tundish is entered by cast gate, at this time
Tundish preheating temperature be 1220 DEG C, molten steel is entered by tundish in strip casting machine, casting at thickness 1.0mm Cast Strip,
The degree of superheat that molten steel is controlled in strip casting process is 10 DEG C, teeming speed 65m/min, molten metal pool level height 180mm.
Cast Strip is subjected to pickling and removes iron scale, 10h is kept the temperature under the conditions of argon gas (20 DEG C of dew points), 1150 DEG C and is obtained often
Change band, { 110 } face abnormal grain growth, such crystal grain ratio is promoted to reach 95%；Normalizing band is directly subjected to pickling and cold-rolling, it is cold
Reduction ratio 80% is rolled, cold rolling tape thickness is 0.2mm.
Under the conditions of pure dry hydrogen (- 40 DEG C of dew point of atmosphere), cold-rolled strip is directly warming up to 1085 DEG C, keeps the temperature 10min, is carried out
Secondary recrystallization is annealed, and the quick secondary recrystallization oriented silicon steel band based on strip continuous casting technology, magnetic property P are obtained17/50For
0.95W/kg, magnetic strength B8For 1.87T.
Embodiment the result shows that, the present invention mainly uses low-level oxidation argon atmospher, high temperature long heat treatment to make Cast Strip { 110 }
It is orientated abnormal grain growth, and area fraction, 90% or more, after a stage cold rolling 70~80%, 950~1085 DEG C are protected
Warm 10min completes quick secondary recrystallization.
Claims (3)
1. a kind of method of the quick secondary recrystallization of orientation silicon steel based on thin band continuous casting technique, which is characterized in that press following step
It is rapid to carry out：
(1) set component smelting molten steel is pressed, ingredient is by weight percentage：C≤0.003%, Si 2.0~4.5%, Mn
0.1~0.25%, Al≤0.002%, S≤0.002%, N≤0.003%, surplus Fe；
(2) strip casting process：Molten steel is entered into tundish, 1200~1250 DEG C of tundish preheating temperature, control by cast gate
The degree of superheat is 10~15 DEG C when molten steel enters molten bath, and molten steel, which is entered by tundish after strip casting machine, forms Cast Strip, control casting
50~70m/min of speed controls molten metal pool level 150~180mm of height, controls Cast Strip 1.0~2.0mm of thickness；Cast Strip goes out cold after roller
But argon gas is used to cool down, 50~70 DEG C/s of control cooling velocity；
(3) will be heat-treated in argon atmospher after the scale removal of Cast Strip, temperature be 1100~1200 DEG C, soaking time be 10~
15h, dew point of atmosphere control is 10~20 DEG C, promotes { 110 } face abnormal grain growth, { 110 } are orientated crystal grain after the heat treatment of Cast Strip
Ratio reaches 90% or more；
(4) pickling Cast Strip after heat treatment directly carries out stage cold rolling, and cold roling reduction is 70~80%；
(5) cold-reduced sheet is annealed under the conditions of pure dry hydrogen, dew point of atmosphere≤- 30 DEG C, be directly warming up to 950~1085 DEG C heat preservation 5~
15min, completes secondary recrystallization process, and magnetic property of oriented silicon steel is：P17/50For 0.95~1.4W/kg, roll to magnetic strength B8For
More than 1.82T.
2. the method for the quick secondary recrystallization of the orientation silicon steel according to claim 1 based on thin band continuous casting technique, special
Sign is that the thin strap continuous casting passes through argon atmospher condition soak, and argon gas bulk purity is 99.9%.
3. the method for the quick secondary recrystallization of the orientation silicon steel according to claim 1 based on thin band continuous casting technique, special
Sign is that the thickness of the cold-rolled strip and quick secondary recrystallization oriented silicon steel band is in 0.2~0.35mm.
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| CN108570597A (en) * | 2018-05-15 | 2018-09-25 | 六安市微特电机有限责任公司 | A kind of Inclusion Precipitation control technique of silicon steel for motors and its casting steel band |
| CN113088636A (en) * | 2021-03-25 | 2021-07-09 | 江苏沙钢集团有限公司 | Method for improving surface color difference defect of high-grade non-oriented silicon steel |
| CN114293106A (en) * | 2021-12-31 | 2022-04-08 | 武汉科技大学 | Double-oriented silicon steel thin strip and preparation method thereof |
| CN115233082B (en) * | 2022-07-28 | 2023-02-24 | 东北大学 | Method for preparing electrical steel thin strip with strong {100} surface texture through directional recrystallization |
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| CN103834858B (en) * | 2012-11-23 | 2016-10-05 | 宝山钢铁股份有限公司 | A kind of manufacture method of low iron loss non-orientation silicon steel |
| CN104294155B (en) * | 2014-09-28 | 2016-05-11 | 东北大学 | A kind of Ultra-low carbon orientation silicon steel and preparation method thereof |
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