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 PDF

Info

Publication number
CN107201478A
CN107201478A CN201710406049.0A CN201710406049A CN107201478A CN 107201478 A CN107201478 A CN 107201478A CN 201710406049 A CN201710406049 A CN 201710406049A CN 107201478 A CN107201478 A CN 107201478A
Authority
CN
China
Prior art keywords
roll
silicon steel
continuous casting
strip
ultra
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201710406049.0A
Other languages
Chinese (zh)
Other versions
CN107201478B (en
Inventor
曹光明
王洋
兰梦飞
张元祥
方烽
卢翔
李成刚
袁国
王国栋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Northeastern University China
Original Assignee
Northeastern University China
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Northeastern University China filed Critical Northeastern University China
Priority to CN201710406049.0A priority Critical patent/CN107201478B/en
Publication of CN107201478A publication Critical patent/CN107201478A/en
Application granted granted Critical
Publication of CN107201478B publication Critical patent/CN107201478B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/004Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16Controlling or regulating processes or operations
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216Modifying 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
    • C21D8/1222Hot rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216Modifying 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
    • C21D8/1233Cold rolling
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244Modifying 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
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/001Ferrous alloys, e.g. steel alloys containing N
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

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

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 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.
CN201710406049.0A 2017-06-01 2017-06-01 A kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology Active CN107201478B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710406049.0A CN107201478B (en) 2017-06-01 2017-06-01 A kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710406049.0A CN107201478B (en) 2017-06-01 2017-06-01 A kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology

Publications (2)

Publication Number Publication Date
CN107201478A true CN107201478A (en) 2017-09-26
CN107201478B CN107201478B (en) 2018-08-17

Family

ID=59907263

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710406049.0A Active CN107201478B (en) 2017-06-01 2017-06-01 A kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology

Country Status (1)

Country Link
CN (1) CN107201478B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3851216A4 (en) * 2018-09-14 2021-07-21 Baoshan Iron & Steel Method for producing ultra-thin hot-rolled strip steel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6322635B1 (en) * 1998-10-27 2001-11-27 Kawasaki Steel Corporation Electromagnetic steel sheet and process for producing the same
CN105018847A (en) * 2015-07-15 2015-11-04 东北大学 Extremely-thin oriented silicon steel plate based on two-roll thin-strip continuous casting and manufacturing method of extremely-thin oriented silicon steel plate

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6322635B1 (en) * 1998-10-27 2001-11-27 Kawasaki Steel Corporation Electromagnetic steel sheet and process for producing the same
CN105018847A (en) * 2015-07-15 2015-11-04 东北大学 Extremely-thin oriented silicon steel plate based on two-roll thin-strip continuous casting and manufacturing method of extremely-thin oriented silicon steel plate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
马少武等: ""异径双辊薄带铸轧熔池中钢液流动特性"", 《东北大学学报(自然科学版)》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3851216A4 (en) * 2018-09-14 2021-07-21 Baoshan Iron & Steel Method for producing ultra-thin hot-rolled strip steel

Also Published As

Publication number Publication date
CN107201478B (en) 2018-08-17

Similar Documents

Publication Publication Date Title
CN101139681B (en) High grade cold rolling non-oriented silicon steel and method for manufacturing same
CN102041367B (en) Manufacturing method of thin strip continuously cast and cold rolled non-oriented electrical steel
CN101238227B (en) Method for producing a grain-oriented electrical steel strip
CN101238226B (en) Method for producing a grain-oriented electrical steel strip
CN101210297B (en) Method for preparing tropism silicon steel
CN103266266B (en) Low-grade non-oriented silicon steel produced in continuous casting and rolling processes of sheet billet and preparation method thereof
CN104294155B (en) A kind of Ultra-low carbon orientation silicon steel and preparation method thereof
CN104762551B (en) A kind of manufacture method of thin strap continuous casting non-oriented silicon steel with high magnetic induction
CN102102141B (en) Hot rolling process for improving structural homogeneity of oriented silicon steel plate
CN104372238A (en) Preparation method of oriented high-silicon steel
CN104726668B (en) A kind of method of efficient production high magnetic induction grain-oriented silicon steel
CN102581008A (en) Processing method for producing low-cost high-formability IF (interstitial-free) steel
CN108796190A (en) A kind of short flow process of Thin Specs high manganese steel sheet
CN108796191B (en) Preparation method of IF steel thin strip
CN107164690A (en) The method that one kind prepares the flourishing texture non-orientation silicon steel thin belt in { 100 } face based on thin strap continuous casting
CN101956127B (en) Manufacturing method of Sn contained non-oriented electrical steel and plate coil
CN107164693B (en) A kind of preparation method based on the high silicon steel cold-strip steel of thin strap continuous casting
CN107245647B (en) A method of flourishing { 100 } plane texture non-orientation silicon steel thin belt is prepared based on thin strap continuous casting
CN103468907A (en) Method for producing cold-rolled non-oriented electrical steel based on ASP (AnGang Strip Production) medium thin slab continuous casting and rolling process
CN107201478B (en) A kind of Ultra-low carbon orientation silicon steel preparation method based on reducing twin-roll thin strip continuous casting technology
CN104726670B (en) A kind of method that short route medium thin slab prepares high magnetic induction grain-oriented silicon steel
CN101275201A (en) Oriented electric steel plate and manufacturing method thereof
CN108085603B (en) A kind of high grade non-oriented silicon steel preparation method based on thin strap continuous casting
CN107164692B (en) A method of the quick secondary recrystallization of orientation silicon steel based on thin band continuous casting technique
CN107217198B (en) A method of rotation cube doubly oriented silicon steel is prepared based on thin strap continuous casting

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant