CN107201478B - A kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology - Google Patents

A kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology Download PDF

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CN107201478B
CN107201478B CN201710406049.0A CN201710406049A CN107201478B CN 107201478 B CN107201478 B CN 107201478B CN 201710406049 A CN201710406049 A CN 201710406049A CN 107201478 B CN107201478 B CN 107201478B
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曹光明
王洋
兰梦飞
张元祥
方烽
卢翔
李成刚
袁国
王国栋
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Northeastern University China
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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
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    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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Abstract

The invention belongs to metallurgical technology field, more particularly to a kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology.By ingredient C 0.002~0.005%, Si 2.0~4.0%, Mn 0.1~0.3%, Al 0.01~0.05%, S 0.015~0.025%, N 0.004~0.015%, Nb≤0.002%, V≤0.002%, Ti≤0.002%, surplus are the molten steel of Fe and inevitable impurity, are 1 by diameter ratio:1.1~1.5 reducing strip casting machine carries out Cast Strip preparation, strip by jet cooling, hot rolling, to batch, obtain thickness specification after pickling and cold-rolling and heat treatment be 0.15~0.35mm, performance P17/50For 0.65~1.2W/kg, roll to magnetic strength B8For the finished product directional silicon steel of 1.90T or more.The present invention is orientated crystal grain using advantageous Goss in reducing asynchronous controlling solidification Cast Strip, so that its ratio in the torrid zone is reached 5% or more, meets requirement of the high magnetic induction grain-oriented silicon steel for its ratio, and product of good performance is obtained by the preparation process of minimizing.

Description

A kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of Ultra-low carbon based on reducing twin-roll thin strip continuous casting technology takes To silicon steel preparation method.
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., In order to ensure that perfect secondary recrystallization, strand high-temperature heating, course of hot rolling Comprehensive Control and normalizing occur for oriented electrical steel Technique becomes essential process node.Strand need at 1350~1400 DEG C keep the temperature with dissolve formed in casting process it is thick The precipitates such as big MnS and AlN and the small and dispersed precipitation in subsequent hot rolled and normalizing process, so high heating temperature can cause Energy waste, a series of disadvantage such as lumber recovery is low, equipment loss is big；Control hot rolling and normalizing also improve technology difficulty and answer Miscellaneous degree.
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, setting rate is up to 102~104℃/s；Therefore, thin strap continuous casting has unique in terms of producing Fe-Si alloys Advantage；In particular, the characteristics of using twin-roll thin strip continuous casting Sub realizable fuzzy matrix, can inhibit second phase particles in orientation silicon steel Cast Strip Precipitation and behavior of growing up, realize the flexible control of inhibitor.On the other hand, it is considered that orientation silicon steel secondary recrystallization Goss seeds are originating primarily from the secondary surface layer of hot rolled plate, in the hot rolling due to roll and the strong rubbing action of rolled piece, steel Plate time surface layer generates enough shear-deformable, and suitable condition is provided for the formation of goss texture.And in twin-roll thin strip continuous casting In the process, can solidification and hot rolling technology be combined into one, obtain sufficient amount of Goss seeds, are to determine twin-roll thin strip continuous casting Technique prepares the key point of orientation silicon steel success or failure.
Twin-roll thin strip continuous casting equipment has same diameter twin-roll cast-rolling mill and reducing double-roller rolling respectively according to the difference of casting roll diameter Two kinds of types of machine.With diameter double roller due between roller molten bath zone it is symmetrical, be relatively easy to control operating procedure in this way so that the strip that casting goes out With good plate shape, but due to controlling limited, flowing instability when frequently can lead to pour steel in molten bath to the pressure head for pouring steel, Beam is big to the impact of bath surface, and the fluctuating level of molten bath entirety is made to improve, this operates for a long time and reliablely and stablely casting Operation is unfavorable；In contrast, the method for the reducing Twin-roll Thin Strip Continuous Casting proposed by Northeastern University, can be more advantageous to holding Laminar Flow in molten bath, to obtain good crystalline structure, and easily operated control, thus with before good development Scape.
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, secondary Gauss seed are obtained by reducing degree of superheat increase casting-rolling force.Obviously, this casting Method casting-rolling force is larger, and casting crackle is unable to control, and surface quality of casting belt is difficult the following process requirement for meeting silicon steel.Italy The United States Patent (USP) (US6964711) of Te Erni companies increase its feature of a time hot rolling technology with hot rolling technology to magnetic property Influence, Main Texture control principle is similar with conventional plate blank continuous casting process, and hot rolling drafts is larger, and control panel is significantly greatly increased Shape difficulty.The United States Patent (USP) (US6739384) of Armco companies of the U.S. is characterized mainly in that cold to secondary cooling speed and a stage Roll influence of the reduction ratio to magnetic property；Northeast China university patent (104294155 A of publication number CN) is mainly characterized by ingredient It is upper that high magnetic induction grain-oriented silicon steel is prepared using Ultra-low carbon design and two benches cold-rolling process, both the above technique mainly by adjusting Cold-rolling process obtains cold rolling Gauss seed, and then realizes secondary recrystallization.Such methods pass through first stage cold rolled annealed process Goss seeds are generated, so preparation flow is longer, and is limited to the elements such as drafts, method prepares product thickness specification needs Complicated casting-rolling technology matches Cast Strip thickness, could complete necessary condition needed for secondary recrystallization.
Mentioned above to be all based on isometrical twin-roll thin strip continuous casting technique about casting orientation silicon steel patent, current method is equal There are flow complexity, equal determination of high cost.And reducing twin-roll thin strip continuous casting is with compared with diameter thin band continuous casting technique, in process of setting End, molten steel bear stronger shear-deformable, are conducive to the formation of goss texture.Chinese invention patent (publication number CN1647870A a kind of patent of the asynchronous casting and rolling machine of sheet metal double roller) is disclosed, arrangement form uses horizontal, is suitble to aluminium The roll casting conditions at a slow speed of the non-ferrous metals such as magnesium.
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 Ultra-low carbon orientation silicon steel preparation method of reducing twin-roll thin strip continuous casting technology is gone by the unique deformation of reducing twin-roll cast-rolling mill To improve the volume fraction of Goss texture in Cast Strip, while controlling solidification and secondary cooling path avoids the shape of coarse precipitates At obtaining the high magnetic strength of Thin Specs, the directional silicon steel of low iron loss.
The technical scheme is that：
A kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology, carries out according to the following steps：
(1) set component smelting molten steel is pressed, ingredient is by weight percentage：C 0.002~0.005%, Si 2.0~ 4.0%, Mn 0.1~0.3%, Al 0.01~0.05%, S 0.015~0.025%, N 0.004~0.015%, Nb≤ 0.002%, V≤0.002%, Ti≤0.002%, surplus are Fe and inevitable impurity；
(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 10~50 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 Casting roll roller diameter ratio processed is 1：1.1~1.5, small casting roll diameter 500mm, big 550~750mm of roller diameter, big pony roll roll surface linear speed Identical, control 40~60m/min of teeming speed is spent, molten metal pool level 150~180mm of height, control Cast Strip 1.8~3.0mm of thickness are controlled；
(3) Cast Strip goes out uses N within the scope of 1100~1300 DEG C after roller2Jet cools down under atmospheric condition, cooling velocity 40 ~60 DEG C/s, 950~1050 DEG C of hot-rolled temperature, 850~950 DEG C of finishing temperature, drafts 10~15%；It batches, rolls up after hot rolling Take 500~600 DEG C of temperature；
(4) single phase multi-pass cold rolling is carried out after hot rolling being cleaned up oxide skin, overall reduction is 85~90%, is obtained 0.15~0.35mm cold-rolled strips are rolled up；
(5) cold-rolled strip carries out to recrystallization annealing at 800 ± 5 DEG C, the time is 150~180s, cold rolling when recrystallization annealing Band is carried out under the conditions of nitrogen hydrogen mixed gas atmosphere, controls the dew point of mixed atmosphere at -30 DEG C or less；Coat MgO interleaving agents Afterwards, under nitrogen hydrogen mixed gas atmosphere protective condition, cold-rolled strip is warming up to 1200 ± 10 DEG C with the speed of 10~30 DEG C/h； 1200 ± 10 DEG C, dew point carry out high annealing in -30 DEG C of pure dry hydrogens below, keep the temperature 20~40h；Furnace cooling is to 400 again ± 10 DEG C, it is air-cooled to room temperature；
(6) smooth stretching annealing is carried out after high annealing, and is wound after carrying out trimming and coating tensile coating drying.
The strip casting process uses reducing asynchronous controlling process of setting, and reducing is than 1：1.1~1.5.
In the Cast Strip crystal grain is orientated containing 5% or more Goss.
In the step (4), the draught per pass of single phase multi-pass cold rolling is 10%~25%.
The magnetic property of oriented silicon steel is：P17/50For 0.65~1.2W/kg, roll to magnetic strength B8For 1.90T or more.
In the step (5), the hydrogen volume ratio 20%~50% of nitrogen hydrogen mixed gas atmosphere.
In the step (6), smooth stretching parameter and annealing is 800 DEG C, nitrogen protection.
Compared with prior art, advantages of the present invention and advantageous effect are：
1, the present invention is orientated crystal grain using advantageous Goss in reducing asynchronous controlling solidification Cast Strip, makes its ratio in the torrid zone Reach 5% or more, meet requirement of the high magnetic induction grain-oriented silicon steel for its ratio, performance is obtained by the preparation process of minimizing Good product.
2, the present invention is suitble to rapid roll-casting process using horizontal thin strap continuous casting asynchronous system, and can roll asynchronous stranding Requirement of the effect with silicon steel to Goss crystal grain seeds combine, this is also exactly in place of the technological innovation of the present invention.
3, all it is to pass through two benches in 104313469 A of patent CN 105018847 A and CN disclosed in Northeastern University Cold rolling carries out orientation silicon steel preparation, and intermediate annealing process increases cost and reduces production efficiency, but the present invention is due to adopting With reducing asynchronous system solidification forming, Goss seed amounts dramatically increase in Cast Strip so that oriented silicon may be implemented in single phase cold rolling Steel is standby.
Description of the drawings
Fig. 1 is the orientation silicon steel Cast Strip preparation method flow based on reducing strip continuous casting technology in the embodiment of the present invention Schematic 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 that cast → air cooling → hot rolling → water cooling → is batched, specific as follows：During molten steel is entered by cast gate Between wrap, 1200~1250 DEG C of tundish preheating temperature, control molten steel when entering molten bath the degree of superheat be 10~20 DEG C, during molten steel passes through Between packet enter strip casting machine after form Cast Strip, control casting roll roller diameter ratio is 1：1.1~1.5, small casting roll diameter 500mm, greatly 550~750mm of roller diameter, big pony roll roll surface speed is identical, controls 40~60m/min of teeming speed, 40~60m/ of control teeming speed Min controls molten metal pool level 150~180mm of height, controls Cast Strip 1.8~3.0mm of thickness.
In the embodiment of the present invention, hydraulic pressure when section cooling is 0.1~0.2MPa, the hydrogen volume purity used for 99.9%.
In the following, being further elaborated on to the present invention by embodiment.
Embodiment 1
In the present embodiment, the Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology, by following step It is rapid to carry out：
By set component smelting molten steel, ingredient is by mass percentage：C 0.002%, Si 4.0%, Mn 0.3%, Al 0.02%, S 0.023%, N 0.004%, Nb 0.0015%, V 0.0012%, Ti 0.0018%, surplus Fe.Then lead to It crosses cast gate and enters preheated tundish, tundish preheating temperature is 1250 DEG C at this time, and molten steel enters thin strap continuous casting by tundish In machine (casting roll roller diameter is respectively 500/550mm), casting controls the overheat of molten steel in strip casting process at the Cast Strip of thickness 1.8mm Degree is 40 DEG C, teeming speed 50m/min, molten metal pool level height 160mm.
Cast Strip goes out uses N at 1200 DEG C after roller2Jet cools down under atmospheric condition, 50 DEG C/s of cooling velocity；Cast Strip is carried out Hot rolling, start rolling temperature are 980 DEG C, and finishing temperature is 880 DEG C, and overall reduction obtains hot-rolled strip 15%；It batches, rolls up after hot rolling Take 550 DEG C of temperature.
By hot-rolled strip section cooling, then pickling removes iron scale, then carries out cold rolling；Cold rolling overall reduction 90%, often Reduction in pass is 10~20%, and the thickness that cold-rolled strip is made is 0.15mm.
Cold-rolled strip is subjected to recrystallization annealing at 800 ± 5 DEG C, time 180s, cold-rolled strip is in nitrogen when recrystallization annealing It is carried out under the conditions of gas hydrogen mixed gas atmosphere (hydrogen volume ratio is 30%), controls the dew point of mixed atmosphere at -30 DEG C.
After coating MgO interleaving agents, under nitrogen hydrogen mixed gas atmosphere (hydrogen volume ratio 30%) protective condition, by cold rolling Band is warming up to 1200 ± 10 DEG C with the speed of 20 DEG C/h；Then under the conditions of 1200 ± 10 DEG C and pure dry hydrogen (dew point is at -30 DEG C) 22h is kept the temperature, high annealing is carried out, last furnace cooling is air-cooled to room temperature to 400 ± 10 DEG C.
Conventional flat is carried out after high annealing and stretches 800 DEG C of annealing, nitrogen protection, and carries out trimming and coating tensile coating It is wound after drying, obtains the Ultra-low carbon orientation silicon steel based on strip continuous casting technology, magnetic property P17/50For 0.65W/kg, magnetic strength B8For 1.94T。
Embodiment 2
In the present embodiment, the Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology, by following step It is rapid to carry out：
By set component smelting molten steel, ingredient is by mass percentage：C 0.003%, Si 3.7%, Mn 0.24%, Al 0.04%, S 0.018%, N 0.0094%, Nb 0.0011%, V 0.0016%, Ti 0.0014%, surplus Fe.Then Enter preheated tundish by cast gate, tundish preheating temperature is 1220 DEG C at this time, and molten steel enters strip by tundish and connects In casting machine (casting roll roller diameter is respectively 500/700mm), casting controls the mistake of molten steel in strip casting process at the Cast Strip of thickness 2.36mm Temperature is 30 DEG C, teeming speed 40m/min, molten metal pool level height 180mm.
Cast Strip goes out uses N at 1150 DEG C after roller2Jet cools down under atmospheric condition, 45 DEG C/s of cooling velocity；Cast Strip is carried out Hot rolling, start rolling temperature are 1030 DEG C, and finishing temperature is 950 DEG C, and overall reduction obtains hot-rolled strip 12%；It batches, rolls up after hot rolling Take 500 DEG C of temperature.
By hot-rolled strip section cooling, then pickling removes iron scale, then carries out cold rolling；Cold rolling overall reduction 87%, often Reduction in pass is 12~15%, and the thickness that cold-rolled strip is made is 0.27mm.
Cold-rolled strip is subjected to recrystallization annealing at 800 ± 5 DEG C, the time is 150~180s, and cold-rolled strip is when recrystallization annealing It is carried out under the conditions of nitrogen hydrogen mixed gas atmosphere (hydrogen volume ratio is 50%), controls the dew point of mixed atmosphere at -35 DEG C.
After coating MgO interleaving agents, under nitrogen hydrogen mixed gas atmosphere (hydrogen volume ratio 30%) protective condition, by cold rolling Band is warming up to 1200 ± 10 DEG C with the speed of 15 DEG C/h；Then under the conditions of 1200 ± 10 DEG C and pure dry hydrogen (dew point is at -35 DEG C) 20h is kept the temperature, high annealing is carried out, last furnace cooling is air-cooled to room temperature to 400 ± 10 DEG C.
Conventional flat is carried out after high annealing and stretches annealing temperature to be 800 DEG C, nitrogen protection, and carry out trimming and coating It is wound after power coated and dried, obtains the Ultra-low carbon orientation silicon steel based on strip continuous casting technology, magnetic property P17/50For 0.95W/kg, magnetic Feel B8For 1.91T.
Embodiment 3
In the present embodiment, the Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology, by following step It is rapid to carry out：
By set component smelting molten steel, ingredient is by mass percentage：C 0.004%, Si 2.8%, Mn 0.19%, Al 0.05%, S 0.015%, N 0.008%, Nb 0.0008%, V 0.0017%, Ti 0.0010%, surplus Fe.Then lead to It crosses cast gate and enters preheated tundish, tundish preheating temperature is 1200 DEG C at this time, and molten steel enters thin strap continuous casting by tundish In machine (casting roll roller diameter is respectively 500/750mm), casting controls the overheat of molten steel in strip casting process at the Cast Strip of thickness 2.75mm Degree is 20 DEG C, teeming speed 60m/min, molten metal pool level height 150mm.
Cast Strip goes out uses N at 1250 DEG C after roller2Jet cools down under atmospheric condition, 55 DEG C/s of cooling velocity；Cast Strip is carried out Hot rolling, start rolling temperature are 1000 DEG C, and finishing temperature is 900 DEG C, and overall reduction obtains hot-rolled strip 15%；It batches, rolls up after hot rolling Take 600 DEG C of temperature.
By hot-rolled strip section cooling, then pickling removes iron scale, then carries out cold rolling；Cold rolling overall reduction 85%, often Reduction in pass is 15~20%, and the thickness that cold-rolled strip is made is 0.35mm.
Cold-rolled strip is subjected to recrystallization annealing at 800 ± 5 DEG C, the time is 150~180s, and cold-rolled strip is when recrystallization annealing It is carried out under the conditions of nitrogen hydrogen mixed gas atmosphere (hydrogen volume ratio is 20%), controls the dew point of mixed atmosphere at -40 DEG C.
After coating MgO interleaving agents, under nitrogen hydrogen mixed gas atmosphere (hydrogen volume ratio 30%) protective condition, by cold rolling Band is warming up to 1200 ± 10 DEG C with the speed of 25 DEG C/h；Then under the conditions of 1200 ± 10 DEG C and pure dry hydrogen (dew point is at -40 DEG C) 22h is kept the temperature, high annealing is carried out, last furnace cooling is air-cooled to room temperature to 400 ± 10 DEG C.
Conventional flat is carried out after high annealing and stretches annealing temperature to be 800 DEG C, nitrogen protection, and carry out trimming and coating It is wound after power coated and dried, obtains the Ultra-low carbon orientation silicon steel based on strip continuous casting technology, magnetic property P17/50For 1.2W/kg, magnetic Feel B8For 1.90T.

Claims (5)

1. a kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology, which is characterized in that by following Step carries out：
(1) set component smelting molten steel is pressed, ingredient is by weight percentage：C 0.002~0.005%, Si 2.0~ 4.0%, Mn 0.1~0.3%, Al 0.01~0.05%, S 0.015~0.025%, N 0.004~0.015%, Nb≤ 0.002%, V≤0.002%, Ti≤0.002%, surplus are Fe and inevitable impurity；
(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 10~50 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 Roller roller diameter ratio is 1：1.1~1.5, small casting roll diameter 500mm, big 550~750mm of roller diameter, big pony roll roll surface speed phase Together, 40~60m/min of teeming speed is controlled, molten metal pool level 150~180mm of height is controlled, controls Cast Strip 1.8~3.0mm of thickness；
(3) Cast Strip goes out uses N within the scope of 1100~1300 DEG C after roller2Jet cools down under atmospheric condition, cooling velocity 40~60 DEG C/s, 950~1050 DEG C of hot-rolled temperature, 850~950 DEG C of finishing temperature, drafts 10~15%；It is batched after hot rolling, batches temperature 500~600 DEG C of degree；
(4) single phase multi-pass cold rolling is carried out after hot rolling being cleaned up oxide skin, overall reduction is 85~90%, acquisition 0.15~ 0.35mm cold-rolled strips are rolled up；
(5) cold-rolled strip carries out to recrystallization annealing at 800 ± 5 DEG C, the time is 150~180s, and cold-rolled strip is when recrystallization annealing It is carried out under the conditions of nitrogen hydrogen mixed gas atmosphere, controls the dew point of mixed atmosphere at -30 DEG C or less；After coating MgO interleaving agents, Under nitrogen hydrogen mixed gas atmosphere protective condition, cold-rolled strip is warming up to 1200 ± 10 DEG C with the speed of 10~30 DEG C/h；1200 ± 10 DEG C, dew point carry out high annealing in -30 DEG C of pure dry hydrogens below, keep the temperature 20~40h；Furnace cooling is to 400 ± 10 again DEG C, it is air-cooled to room temperature；
(6) smooth stretching annealing is carried out after high annealing, and is wound after carrying out trimming and coating tensile coating drying；
In the Cast Strip crystal grain is orientated containing 5% or more Goss.
2. the Ultra-low carbon orientation silicon steel preparation method according to claim 1 based on reducing twin-roll thin strip continuous casting technology, It is characterized in that, in the step (4), the draught per pass of single phase multi-pass cold rolling is 10%~25%.
3. the Ultra-low carbon orientation silicon steel preparation method according to claim 1 based on reducing twin-roll thin strip continuous casting technology, It is characterized in that, the magnetic property of oriented silicon steel is：P17/50For 0.65~1.2W/kg, roll to magnetic strength B8For 1.90T or more.
4. the Ultra-low carbon orientation silicon steel preparation method according to claim 1 based on reducing twin-roll thin strip continuous casting technology, It is characterized in that, in the step (5), the hydrogen volume ratio 20%~50% of nitrogen hydrogen mixed gas atmosphere.
5. the Ultra-low carbon orientation silicon steel preparation method according to claim 1 based on reducing twin-roll thin strip continuous casting technology, It is characterized in that, in the step (6), smooth stretching parameter and annealing is 800 DEG C, nitrogen protection.
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