CN107201478A - 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 PDFInfo
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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 composition 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 is the molten steel of Fe and inevitable impurity, is 1 by diameter ratio:1.1~1.5 reducing strip caster carries out Cast Strip preparation, and strip is cooled down by jet, hot rolling, to batch, obtain thickness specification after pickling and cold-rolling and heat treatment be 0.15~0.35mm, and performance is P17/50For 0.65~1.2W/kg, roll to magnetic strength B8For more than 1.90T finished product directional silicon steel.The present invention is made its ratio in the torrid zone reach more than 5%, meets requirement of the high magnetic induction grain-oriented silicon steel for its ratio, product of good performance is obtained by the preparation process of minimizing using Goss orientation crystal grain favourable in reducing asynchronous controlling solidification Cast Strip.
Description
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 along rolling direction have high magnetic strength, low iron loss fine magnetic property, be mainly used in various transformers
Iron core, is indispensable important soft magnetic alloy in power electronics and war industry.Tradition directed silicon steel preparation technology complexity is superfluous
Length mainly includes：Smelting-continuous casting-strand high-temperature heating-hot rolling-normalizing-is 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 turns into essential process node.Strand need 1350~1400 DEG C be incubated formed with dissolving 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-up temperature can cause
Energy waste, a series of shortcoming such as lumber recovery is low, equipment loss is big；Control hot rolling and normalizing also improve technology difficulty and multiple
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
The production process 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, thickness is directly produced for 1~6mm strips by liquid molten steel；Its process characteristic is liquid metal
Pressure processing and plastic deformation are born while crystallization and freezing, is 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 uniqueness in terms of Fe-Si alloys are produced
Advantage；Particularly, using twin-roll thin strip continuous casting Sub realizable fuzzy matrix the characteristics of, second phase particles in orientation silicon steel Cast Strip can be suppressed
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 top layer of hot rolled plate, in the hot rolling due to roll and the strong rubbing action of rolled piece, steel
Plate time top layer produces enough detrusion, and suitable condition is provided for the formation of goss texture.And in twin-roll thin strip continuous casting
During, can solidification and hot rolling technology be united two 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 footpath 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 footpath double roller due between roller molten bath zone it is symmetrical, be so relatively easy to control operating procedure 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, improves the overall fluctuating level in molten bath, and this is operated for a long time and reliablely and stablely to casting
Operation is unfavorable；By contrast, the method for the reducing Twin-roll Thin Strip Continuous Casting proposed by Northeastern University, can be more beneficial for keeping
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
To the influence of silicon-steel magnetic energy, secondary Gauss seed is to increase casting-rolling force acquisition by reducing the degree of superheat.Obviously, this casting
Method casting-rolling force is larger, and casting crackle is uncontrollable, 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 add its feature of a time hot rolling technology with hot rolling technology to magnetic property
Influence, its 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 (A of publication number CN 104294155) is mainly characterized by composition
Upper use Ultra-low carbon design and two benches cold-rolling process prepare high magnetic induction grain-oriented silicon steel, and both the above technique mainly passes through adjustment
Cold-rolling process, obtains cold rolling Gauss seed, and then realize secondary recrystallization.This kind of method passes through first stage cold rolled annealed process
Goss seeds are produced, so preparation flow is longer, and is limited to the key elements such as drafts, its method prepares product thickness specification needs
Complicated casting-rolling technology matches Cast Strip thickness, could complete necessary condition needed for secondary recrystallization.
It is previously noted and is all based on isometrical twin-roll thin strip continuous casting technique on casting orientation silicon steel patent, current method is equal
There is flow complicated, cost height etc. is determined.And reducing twin-roll thin strip continuous casting is with compared with the thin band continuous casting technique of footpath, in process of setting
End, molten steel bears stronger detrusion, is 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, its arrangement form uses horizontal, is adapted to aluminium
The roll casting conditions at a slow speed of the non-ferrous metals such as magnesium.
The content of the invention
The above mentioned problem existed for existing orientation silicon steel in preparation method and aspect of performance, the present invention provides one kind and is based on
The Ultra-low carbon orientation silicon steel preparation method of reducing twin-roll thin strip continuous casting technology, passes through the unique deformation row of reducing twin-roll cast-rolling mill
The volume fraction of Goss texture in Cast Strip to be improved, while control solidification and secondary cooling path avoid the shape of coarse precipitates
Into high magnetic strength, the directional silicon steel of low iron loss of acquisition Thin Specs.
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, is carried out according to the following steps：
(1) set component smelting molten steel is pressed, its composition 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,
It is 10~50 DEG C into degree of superheat during molten bath to control molten steel, and molten steel forms Cast Strip after entering strip caster by tundish, controls
Casting roll roll neck 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
Degree is identical, controls 40~60m/min of teeming speed, control molten metal pool level 150~180mm of height, controls Cast Strip 1.8~3.0mm of thickness；
(3) Cast Strip goes out uses N in the range of 1100~1300 DEG C after roller2Jet is cooled 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%；Batch, roll up after hot rolling
Take 500~600 DEG C of temperature；
(4) by hot rolling clean out after oxide skin carry out single phase multi-pass it is cold rolling, overall reduction be 85~90%, obtain
0.15~0.35mm cold rolling straps are rolled up；
(5) cold rolling strap is subjected to recrystallization annealing at 800 ± 5 DEG C, the time is 150~180s, cold rolling during recrystallization annealing
Band is carried out under the conditions of nitrogen hydrogen mixed gas atmosphere, controls the dew point of mixed atmosphere below -30 DEG C；Coat MgO interleaving agents
Afterwards, under nitrogen hydrogen mixed gas atmosphere protective condition, cold rolling strap is warming up to 1200 ± 10 DEG C with 10~30 DEG C/h speed；
1200 ± 10 DEG C, high annealing is carried out in pure dry hydrogen of the dew point below -30 DEG C, be incubated 20~40h；Furnace cooling is to 400 again
± 10 DEG C, it is air-cooled to normal temperature；
(6) smooth stretching annealing is carried out after high annealing, and carries out trimming and is wound after coating tensile coating drying.
The strip casting process uses reducing asynchronous controlling process of setting, and reducing compares 1：1.1~1.5.
In described Cast Strip crystal grain is orientated containing more than 5% Goss.
In described step (4), the cold rolling draught per pass of single phase multi-pass is 10%~25%.
Described magnetic property of oriented silicon steel is：P17/50For 0.65~1.2W/kg, roll to magnetic strength B8For more than 1.90T.
In described step (5), the hydrogen volume ratio 20%~50% of nitrogen hydrogen mixed gas atmosphere.
In described step (6), smooth stretching parameter and annealing is 800 DEG C, nitrogen protection.
Compared with prior art, advantages of the present invention and beneficial effect are：
1st, the present invention makes its ratio in the torrid zone using Goss orientation crystal grain favourable in reducing asynchronous controlling solidification Cast Strip
More than 5% is reached, requirement of the high magnetic induction grain-oriented silicon steel for its ratio is met, performance is obtained by the preparation process of minimizing
Good product.
2nd, the present invention is adapted 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 technological innovation of the invention.
3rd, all it is by two benches in the A of the patent CN 105018847 and A of CN 104313469 disclosed in Northeastern University
Cold rolling progress orientation silicon steel preparation, 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 are dramatically increased in Cast Strip so that single phase is cold rolling can to realize oriented silicon
Steel is standby.
Brief 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.
Embodiment
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 is batched including cast → air cooling → hot rolling → water cooling →, specific as follows：During molten steel is entered by cast gate
Between wrap, 1200~1250 DEG C of tundish preheating temperature, control molten steel enter molten bath when the degree of superheat be 10~20 DEG C, molten steel is in
Between bag enter strip caster after form Cast Strip, control casting roll roll neck ratio be 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, control 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 during section cooling is 0.1~0.2MPa, the hydrogen volume purity used for
99.9%.
Below, the present invention is further elaborated on 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, composition 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 is Fe.Then lead to
The tundish that cast gate enters preheating is crossed, now tundish preheating temperature is 1250 DEG C, and molten steel enters thin strap continuous casting by tundish
In machine (casting roll roll neck is respectively 500/550mm), casting controls the overheat of molten steel into thickness 1.8mm Cast Strip in strip casting process
Spend for 40 DEG C, teeming speed 50m/min, molten metal pool level height 160mm.
Cast Strip goes out after roller uses N at 1200 DEG C2Jet is cooled down under atmospheric condition, 50 DEG C/s of cooling velocity；Cast Strip is carried out
Hot rolling, start rolling temperature is 980 DEG C, and finishing temperature is 880 DEG C, and overall reduction obtains hot-rolled strip 15%；Batch, roll 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 rolling strap is made is 0.15mm.
Cold rolling strap is subjected to recrystallization annealing at 800 ± 5 DEG C, the time is 180s, and cold rolling strap is in nitrogen during recrystallization annealing
Carried out under the conditions of gas hydrogen mixed gas atmosphere (hydrogen volume ratio is 30%), control the dew point of mixed atmosphere at -30 DEG C.
Coat after MgO interleaving agents, will be cold rolling under nitrogen hydrogen mixed gas atmosphere (hydrogen volume ratio 30%) protective condition
Band is warming up to 1200 ± 10 DEG C with 20 DEG C/h speed；Then under the conditions of 1200 ± 10 DEG C and pure dry hydrogen (dew point is at -30 DEG C)
22h is incubated, high annealing is carried out, last furnace cooling is air-cooled to normal temperature to 400 ± 10 DEG C.
800 DEG C of conventional flat stretching annealing, nitrogen protection are carried out after high annealing, and carries out trimming and coating tensile coating
Wound after drying, obtain 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, composition 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 is Fe.Then
Enter the tundish of preheating by cast gate, now tundish preheating temperature is 1220 DEG C, and molten steel is connected by tundish into strip
In casting machine (casting roll roll neck is respectively 500/700mm), casting controls the mistake of molten steel into thickness 2.36mm Cast Strip in strip casting process
Temperature is 30 DEG C, teeming speed 40m/min, molten metal pool level height 180mm.
Cast Strip goes out after roller uses N at 1150 DEG C2Jet is cooled down under atmospheric condition, 45 DEG C/s of cooling velocity；Cast Strip is carried out
Hot rolling, start rolling temperature is 1030 DEG C, and finishing temperature is 950 DEG C, and overall reduction obtains hot-rolled strip 12%；Batch, roll 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 rolling strap is made is 0.27mm.
Cold rolling strap is subjected to recrystallization annealing at 800 ± 5 DEG C, the time is 150~180s, and cold rolling strap is during recrystallization annealing
Carried out under the conditions of nitrogen hydrogen mixed gas atmosphere (hydrogen volume ratio is 50%), control the dew point of mixed atmosphere at -35 DEG C.
Coat after MgO interleaving agents, will be cold rolling under nitrogen hydrogen mixed gas atmosphere (hydrogen volume ratio 30%) protective condition
Band is warming up to 1200 ± 10 DEG C with 15 DEG C/h speed；Then under the conditions of 1200 ± 10 DEG C and pure dry hydrogen (dew point is at -35 DEG C)
20h is incubated, high annealing is carried out, last furnace cooling is air-cooled to normal temperature to 400 ± 10 DEG C.
It is 800 DEG C that conventional flat stretching annealing temperature is carried out after high annealing, nitrogen protection, and carries out trimming and coating
Wound after power coated and dried, obtain 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, composition 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 is Fe.Then lead to
The tundish that cast gate enters preheating is crossed, now tundish preheating temperature is 1200 DEG C, and molten steel enters thin strap continuous casting by tundish
In machine (casting roll roll neck is respectively 500/750mm), casting controls the overheat of molten steel into thickness 2.75mm Cast Strip in strip casting process
Spend for 20 DEG C, teeming speed 60m/min, molten metal pool level height 150mm.
Cast Strip goes out after roller uses N at 1250 DEG C2Jet is cooled down under atmospheric condition, 55 DEG C/s of cooling velocity；Cast Strip is carried out
Hot rolling, start rolling temperature is 1000 DEG C, and finishing temperature is 900 DEG C, and overall reduction obtains hot-rolled strip 15%；Batch, roll 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 rolling strap is made is 0.35mm.
Cold rolling strap is subjected to recrystallization annealing at 800 ± 5 DEG C, the time is 150~180s, and cold rolling strap is during recrystallization annealing
Carried out under the conditions of nitrogen hydrogen mixed gas atmosphere (hydrogen volume ratio is 20%), control the dew point of mixed atmosphere at -40 DEG C.
Coat after MgO interleaving agents, will be cold rolling under nitrogen hydrogen mixed gas atmosphere (hydrogen volume ratio 30%) protective condition
Band is warming up to 1200 ± 10 DEG C with 25 DEG C/h speed；Then under the conditions of 1200 ± 10 DEG C and pure dry hydrogen (dew point is at -40 DEG C)
22h is incubated, high annealing is carried out, last furnace cooling is air-cooled to normal temperature to 400 ± 10 DEG C.
It is 800 DEG C that conventional flat stretching annealing temperature is carried out after high annealing, nitrogen protection, and carries out trimming and coating
Wound after power coated and dried, obtain 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 (7)
1. a kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology, it is characterised in that by following
Step is carried out：
(1) set component smelting molten steel is pressed, its composition 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 is entered by tundish forms Cast Strip after strip caster, control casting
Roller roll neck 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, control molten metal pool level 150~180mm of height are controlled, Cast Strip 1.8~3.0mm of thickness is controlled；
(3) Cast Strip goes out uses N in the range of 1100~1300 DEG C after roller2Jet is cooled 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%；Batched after hot rolling, batch temperature
500~600 DEG C of degree；
(4) by hot rolling clean out after oxide skin carry out single phase multi-pass it is cold rolling, overall reduction be 85~90%, obtain 0.15~
0.35mm cold rolling straps are rolled up；
(5) cold rolling strap is subjected to recrystallization annealing at 800 ± 5 DEG C, the time is 150~180s, and cold rolling strap is during recrystallization annealing
Carried out under the conditions of nitrogen hydrogen mixed gas atmosphere, control the dew point of mixed atmosphere below -30 DEG C；Coat after MgO interleaving agents,
Under nitrogen hydrogen mixed gas atmosphere protective condition, cold rolling strap is warming up to 1200 ± 10 DEG C with 10~30 DEG C/h speed；1200
± 10 DEG C, high annealing is carried out in pure dry hydrogen of the dew point below -30 DEG C, be incubated 20~40h；Furnace cooling is to 400 ± 10 again
DEG C, it is air-cooled to normal temperature；
(6) smooth stretching annealing is carried out after high annealing, and carries out trimming and is wound after coating tensile coating drying.
2. the Ultra-low carbon orientation silicon steel preparation method according to claim 1 based on reducing twin-roll thin strip continuous casting technology, its
It is characterised by, the strip casting process uses reducing asynchronous controlling process of setting, reducing compares 1：1.1~1.5.
3. the Ultra-low carbon orientation silicon steel preparation method according to claim 1 based on reducing twin-roll thin strip continuous casting technology, its
It is characterised by, crystal grain is orientated containing more than 5% Goss in described Cast Strip.
4. the Ultra-low carbon orientation silicon steel preparation method according to claim 1 based on reducing twin-roll thin strip continuous casting technology, its
It is characterised by, in described step (4), the cold rolling draught per pass of single phase multi-pass is 10%~25%.
5. the Ultra-low carbon orientation silicon steel preparation method according to claim 1 based on reducing twin-roll thin strip continuous casting technology, its
It is characterised by, described magnetic property of oriented silicon steel is：P17/50For 0.65~1.2W/kg, roll to magnetic strength B8For more than 1.90T.
6. the Ultra-low carbon orientation silicon steel preparation method according to claim 1 based on reducing twin-roll thin strip continuous casting technology, its
It is characterised by, in described step (5), the hydrogen volume ratio 20%~50% of nitrogen hydrogen mixed gas atmosphere.
7. the Ultra-low carbon orientation silicon steel preparation method according to claim 1 based on reducing twin-roll thin strip continuous casting technology, its
It is characterised by, in described step (6), smooth stretching parameter and annealing is 800 DEG C, nitrogen protection.
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| EP3851216A4 (en) * | 2018-09-14 | 2021-07-21 | Baoshan Iron & Steel Co., Ltd. | Method for producing ultra-thin hot-rolled strip steel |
| CN114101612A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Preparation method of jet-cast high-performance 7XXX aluminum alloy thin strip |
| WO2022057924A1 (en) * | 2020-09-18 | 2022-03-24 | Jiangsu Shagang Group Co., Ltd. | Controlling surface wrinkles on thin strip produced by twin roll casting and hot rolling |
| CN114293100A (en) * | 2021-12-14 | 2022-04-08 | 河北敬业高品钢科技有限公司 | Ultra-low iron loss non-oriented silicon steel thin strip and preparation method thereof |
| CN116037874A (en) * | 2022-12-30 | 2023-05-02 | 东北大学 | Casting and rolling device and casting and rolling process for aluminum alloy gradient material |
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