CN107058874B - A kind of method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting - Google Patents

A kind of method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting Download PDF

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CN107058874B
CN107058874B CN201710402775.5A CN201710402775A CN107058874B CN 107058874 B CN107058874 B CN 107058874B CN 201710402775 A CN201710402775 A CN 201710402775A CN 107058874 B CN107058874 B CN 107058874B
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silicon steel
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CN107058874A (en
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李成刚
方烽
兰梦飞
张元祥
卢翔
王洋
曹光明
袁国
王国栋
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Northeastern University China
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    • 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%
    • 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
    • C21D8/1244Modifying 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
    • C21D8/1272Final recrystallisation annealing
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/002Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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

Abstract

The invention belongs to metallurgical technology field, more particularly to a kind of method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting.It follows the steps below:(1) according to the ingredient smelting molten steel of setting, ingredient is by mass percentage:C≤0.003%, Si 2.0~3.5%, Mn≤0.01%, Al≤0.003%, P 0.02~0.06%, S≤0.003%, surplus are Fe and inevitable impurity;(2) thin strap continuous casting obtains Cast Strip;(3) hot rolling is carried out under inert atmosphere conditions;(4) it is cooled to 650 DEG C to batch, removal iron oxide skin depth carries out single phase multi-pass cold rolling;(5) cold-rolled strip carries out continuous annealing, is then coated with insulating layer and dries, and obtains high-performance non-orientation silicon steel thin slab product.The method of the present invention is based on strip continuous casting technology, simplifies technique, reduces production cost, improves the magnetic property of non-orientation silicon steel Thin Specs finished product.

Description

A kind of method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting
Technical field
The invention belongs to metallurgical technology field, more particularly to it is thin based on thin strap continuous casting to prepare non-oriented silicon steel with high magnetic induction for one kind The method of specification product.
Background technology
Silicon steel is energy saving metal soft magnetic material indispensable in electric power, electronics and war industry, Thin Specs No yield point silicon Steel is mainly used for the core material of medium-high frequency (400Hz~10kHz) motor, micro machine, is always China market one kind in short supply Material.Non-orientation silicon steel thin slab product generally refers to silicone content 1.0~4.0%, and thickness is in the electrician of 0.08~0.20mm Steel, with the characteristic of its low-iron loss high-magnetic strength, using on the stator and rotor core of medium-high frequency motor.With global energy anxiety And climate warming, energy saving and environmental requirement motor reduce loss by improving frequency, it is desirable that core material has high frequency performance.Cause This, the non-orientation silicon steel for preparing the high magnetic strength of Thin Specs and low iron loss is the key core of motor high efficiency.
With the gradual development of power industry, becoming increasingly conspicuous the problems such as energy shortage and environmental pollution, electronic product is just Develop towards the direction of miniaturization, high efficiency, high precision int, however the iron core of traditional cold-reduced silicon sheet manufacture has been difficult to meet Product requirement, develop low iron loss, high magnetic strength Thin Specs non-orientation silicon steel product come substitute existing common cold-reduced silicon sheet be promote Motor product is made to reduce volume, reduce energy consumption, mitigate quality, carries efficient important channel.From the point of view of properties of product, No yield point Electrical sheet strip in razor-thin is mainly for the manufacture of various electric machine iron cores, and including industrial small size motor, automobile is small-sized, micromachine iron Core etc., tradition rely on import, and the strip product produced by small-scale military enterprise or scientific research institution has been unable to meet future market The demand of development.In the startup generator of motor and hybrid power automobile used in fuel system, air-conditioning system, cooling system In, it is main using the non-orientation silicon steel that thickness is 0.35mm, and thickness is thinned to 0.35mm from 0.5mm can effectively reduce silicon steel Eddy current loss.At present, generally use is less than 0.2mm's in the core material of medium-high frequency motor, control electric appliance and high energy acclerator Non-orientation silicon steel thin belt.As frequency conversion and the gradual development of high frequency control technology, non-oriented electrical steel 0.15mm or 0.20mm are thin The market demand with product will gradually increase, and the technology of conventionally employed old process technique productions Thin Specs non-orientation silicon steel Potentiality key cut totally, therefore develops new process as current urgent problem.
Twin-roll thin strip continuous casting technology, be placed in parallel with two, the ceramic side at the crystallization roll that direction of rotation is opposite and both ends The molten bath that sealing plate is formed forms a mobile crystallizer, and liquid molten steel is directly injected into molten bath gradually on the surface of crystallization roll Crystallization, crystallizing layer progressive additive meet in position of being close to the exit and undergo a very short solid phase strip casting process.It is this by liquid The direct solidification forming target thickness strip of state molten steel, can be not required to by the production processes such as continuous casting, heating, hot rolling and normalizing, liquid Metal subjects pressure processing and plastic deformation while crystallization and freezing, thin from liquid metal solidification to solid-state in the short time Band, setting rate is up to 102~104DEG C/s, silicon steel coagulation tissue has been refined significantly.Thin strap continuous casting prepares the work of non-orientation silicon steel Skill feature determines that it can provide new technical thought, and one side thin strap continuous casting can directly produce 1.2~1.5mm Cast Strips, than Conventional hot-rolled strip is thin, can pass through single phase cold rolling for strip in razor-thin, effectively reduce cold roling reduction, improve lumber recovery.The opposing party Face, Cast Strip tissue is controllable, the rational Cast Strip for controlling bath superheat degree that can obtain tiny equiax crystal tissue.Therefore, strip connects Casting process provides new technological approaches for the preparation of Thin Specs non-orientation silicon steel.
By retrieving in the document published both at home and abroad, about production cold rolling Thin Specs non-orientation silicon steel chemistry into Point, the report of process and its aspect of performance.Such as:Chinese invention patent (publication number CN104294022A) discloses a kind of high The preparation method of magnetic strength Thin Specs non-orientation silicon steel, it is required that material composition be:Si:2.8~3.2%, C:0.025~ 0.045%, Mn:0.05~0.35%, P≤0.008%, N≤0.005%, S≤0.02%, surplus is for iron and inevitably Impurity;Process route for silicon steel ingot casting → 1200~1350 DEG C heating after hot rolling → 1110~1150 DEG C normalizing → contain intermediate annealing Be cold-rolled to 0.12~0.2mm → decarburizing annealing → final annealing twice.Wherein, in ingot casting column crystal fraction for 50~ 100%, normalizing process is in pure N2Under environment, twice in cold-rolled process, once cold rolling reduction ratio is 73~80%, secondary cold-rolling pressure Lower rate is 55~60%, and decarburizing annealing uses 20~30%H2+ 70~80%N2, annealing is in pure H eventually2Under the conditions of.The patent document In, hot rolled plate even tissue, precipitate roughening are made, while carry out decarburizing annealing before annealing eventually using high temperature normalizing, produced Rhythm is slow, and cost increases.Difference lies in eliminate continuous casting billet structure control, hot rolling, normalizing etc. at all with the above method by the present invention Molten steel solidification using thin strap continuous casting flow is directly shaped and obtains cold rolling blank, and pass through a pickling by technical controlling requirement Cold rolling flow realizes final finished thickness, and properties of product can be greatly improved.
Chinese invention patent (publication number CN105779878) discloses a kind of producer of intermediate frequency cold rolling non-orientation silicon steel thin belt Method, chemical composition requirement C≤0.003%, Si:2.0~3.3%, Al:0.5~1.0%, Mn:0.10~0.80%, P≤ 0.020%, S≤0.008%, N≤0.003%, remaining is Fe and inevitable impurity.Process route is:Continuous casting → hot rolling → normalizing → cold rolling → annealing.Another Chinese invention patent (105238996 A of publication number CN) described Composition And Process and China Patent of invention (publication number CN105779878) is similar.Wherein, heat of volume two with size is used in CN105779878 cold-rolled process It rolls plate and stacks trimming bundling after cold rolling, using bell type heating furnace, H during annealing2+N2Protection.Hot rolling is used in the patent document Lamination coefficient can be seriously affected by winding off progress cold rolling ply rolling, can not mass produced.It is of the invention to exist with above-mentioned invention distinguishes In, change composition design thinking according to thin strap continuous casting process features, relax C content limitation, and use extremely low Al content Control, this is because saving the influence of dynamic recrystallization thinning microstructure repeatedly in course of hot rolling, reduces in composition design to Al With the limitation of C content.And greatly simplified in cold roll forming mode, improve performance indicator.
Chinese invention patent (101967602 A of publication number CN) disclose a kind of non-orientation silicon steel thin belt and preparation method thereof, Chinese invention patent (102049479 A of publication number CN) discloses a kind of twin-roll thin strip continuous casting, and to prepare non-orientation silicon steel equiax crystal thin (102274936 A of publication number CN disclose a kind of nothing based on twin-roll thin strip continuous casting technology to the method and Chinese invention patent of made-up belt The manufacturing method of directional silicon steel, it is proposed that utilize thin strap continuous casting flow manufacturing high-performance non-orientation silicon steel, control No yield point silicon The patent requirements such as steel solidified structure.
Invention content
For the above problem existing for the preparation method of existing non-orientation silicon steel thin slab product, it is an object of the invention to A kind of method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting is provided, based on to non-orientation silicon steel double Tissue-texture during roll thin-belt continuous casting Sub realizable fuzzy matrix is understood systematicly, by rational designing chemical composition, suitable control Thin band continuous casting technique, the Thin Specs non-oriented silicon steel with high magnetic induction product being had excellent performance by subsequent cold working and annealing.
The technical scheme is that:
A kind of method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, is carried out according to the following steps:
(1) by set component smelting molten steel, ingredient is by weight percentage:C≤0.006%, Si 2.0~4.5%, Mn 0.2~0.4%, Al≤0.003%, P 0.02~0.06%, S≤0.003%, 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 10~30 DEG C to control the degree of superheat in molten bath, and molten steel, which is entered by tundish after strip casting machine, forms Cast Strip, controls teeming speed 60 ~90m/min controls molten metal pool level 75~120mm of height, controls Cast Strip 1.0~1.5mm of thickness;
(3) Cast Strip naturally cools to hot-rolling mill, 900~950 DEG C of hot-rolled temperature, finish to gauge under inert atmosphere conditions after going out roller 800~850 DEG C of temperature, drafts 10~15% batch after hot rolling, 640~660 DEG C of coiling temperature;
(4) single phase multi-pass cold rolling is carried out after hot rolling being cleaned up oxide skin, overall reduction is 80~90%, is obtained cold Roll band volume;
(5) cold-rolled strip is heat-treated by continuous annealing, in 850~950 DEG C of progress recrystallization annealings, the time is 120~180s, recrystallization annealing carry out under the conditions of nitrogen hydrogen mixed gas atmosphere, control the dew point of mixed atmosphere -30 DEG C with Under, it is then coated with insulating layer and dries, obtain high-performance non-orientation silicon steel thin slab product.
The method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, based on thin strap continuous casting into Type technique, molten steel enter strip casting machine by tundish, are formed in the casting roll of rotation and the crystallizer of side seal board composition molten Pond and solidification forming by controlling eutectic pit level and molten bath low overheat, obtain fine uniform equiaxed grain structure, improve cold rolling Crystallized ability.
The non-orientation silicon steel is controlled using ultralow Al, Mn content.
The non-orientation silicon steel Cast Strip thickness is 1.0~1.5mm, by 10~15% drafts hot rolling and 80~ 0.1~0.2mm of belt steel thickness after 90% drafts cold rolling.
The non-orientation silicon steel magnetic property is:P10/400For 7.2~11W/kg, magnetic strength B50For 1.68~1.75T.
In the step (4), the draught per pass of single phase multi-pass cold rolling is 10~20%.
In the step (5), the hydrogen volume ratio of nitrogen hydrogen mixed gas atmosphere is 20%~60%.
Compared with prior art, advantages of the present invention and advantageous effect are:
1) present invention on the basis of existing technology, has adjusted component requirements, has redesigned thin strap continuous casting flow without taking To silicon steel component system, it is allowed to more adapt to the continuous casting process of thin strap continuous casting and silicon steel process features.Present component is by weight Measuring percentage is:C≤0.006%, Si 2.0~4.5%, Mn 0.2~0.4%, Al≤0.003%, P 0.02~0.06%, S≤0.003%, surplus is Fe and inevitable impurity --- new control thought is to eliminate Al adding in component system Add.Al elements expand ferrite temperature range, improve and are recrystallized in big compression ratio course of hot rolling, are not required in thin strap continuous casting flow This technological requirement is wanted, fluidity molten steel can be improved after the reduction of Al elements, avoid Al2O3The phenomenon that process of setting water blocking mouthh, is sent out It is raw.In addition, the present invention relaxes the requirement of C content, it is allowed to advantageously reduce production difficulty, improves rhythm of production.Silicone content carries Height is conducive to high frequency iron loss reduction to 2.0~4.5%.
2) present invention is proposed prepares the complete of 0.1~0.2mm Thin Specs non-orientation silicon steel strips based on thin strap continuous casting flow Process is covered, specifies that control composition range, as-cast structure, Cast Strip thickness, cold heat roll drafts and final products performance Relevance.
3) present invention proposes that the technique that control liquid level and the degree of superheat combine obtains good as-cast structure, to realize that a stage is cold The rolling flow rolled lays the foundation.
4) present invention realizes annealed sheet low iron loss, high magnetic strength by solidified structure-hot rolling-cold rolling-annealing process matching Magnetic property index.
Description of the drawings
Fig. 1 is to prepare non-oriented silicon steel with high magnetic induction thin slab product preparation flow figure based on thin strap continuous casting;
Fig. 2 is Cast Strip micro-organization chart in embodiment 1.
Specific embodiment
In specific implementation process, the strip casting machine used is strip disclosed in patent (publication number CN103551532A) Conticaster.As shown in Figure 1, it is as follows to prepare non-oriented silicon steel with high magnetic induction thin slab product preparation flow based on thin strap continuous casting:By setting Determine ingredient smelting molten steel, complete strip casting process into strip casting machine, go out the Cast Strip after casting machine and carry out a time hot rolling, heat It rolls band and single phase multi-pass cold rolling is carried out after pickling, recrystallization annealing is carried out after obtaining target thickness strip, plate surface of annealing It applies insulating coating and dries, obtain Thin Specs non-orientation silicon steel finished product.
In the following, the present invention is further elaborated on by embodiment.
Embodiment 1
In the present embodiment, method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, by following step It is rapid to carry out:
By set component smelting molten steel, ingredient is by weight percentage:C 0.006%, Si 2.0%, Mn 0.4%, Al 0.003%, P 0.04%, S 0.0025%, surplus Fe;
Strip casting process:Molten steel is entered into tundish by cast gate, 1230 DEG C of tundish preheating temperature controls the degree of superheat It it is 30 DEG C, molten steel enters strip casting machine by tundish, liquid level 120mm, teeming speed 60m/min is controlled, in the casting of rotation Molten bath and solidification forming are formed in roller and the crystallizer of side seal board composition, Cast Strip thickness is 1.5mm;
Cast Strip goes out after roller under inert atmosphere conditions, is cooled to 950 DEG C with the rate of 50 DEG C/s, then carries out hot rolling, open 950 DEG C of temperature, 850 DEG C of finishing temperature are rolled, hot rolled strip is made in drafts 15%, and hot rolled strip is cold with the rate of 20 DEG C/s But it is batched to 650 DEG C;
By hot-rolled strip pickling to remove oxide, 6 passage cold rolling of single phase, drafts 84%, every time pressure are then carried out Lower amount is 13~15%, obtains cold-rolled strip, thickness 0.20mm;
Cold-rolled strip by continuous annealing is heat-treated, recrystallization annealing, time 180s are carried out, then tie at 950 DEG C Crystalline substance annealing carries out under the conditions of nitrogen hydrogen mixed gas atmosphere (the hydrogen volume ratio of the present embodiment is 20%), controls mixed atmosphere Dew point at -30 DEG C, be then coated with insulating layer and dry, obtain final finished.Magnetic property P10/400For 11W/kg, magnetic strength B50For 1.75T。
As shown in Fig. 2, from Cast Strip microstructure can be seen that Cast Strip solidification coarse grains it is uniform, in cooling procedure not Occur notable transformation behavior, the effective protection genetic effect of as-cast structure, so as to obtain good finished product magnetic property.
Embodiment 2
In the present embodiment, method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, by following step It is rapid to carry out:
By set component smelting molten steel, ingredient is by weight percentage:C 0.0052%, Si 2.2%, Mn 0.35%, Al 0.003%, P 0.05%, S 0.0022%, surplus Fe;
Strip casting process:Molten steel is entered into tundish by cast gate, 1230 DEG C of tundish preheating temperature controls the degree of superheat It it is 30 DEG C, molten steel enters strip casting machine by tundish, liquid level 120mm, teeming speed 60m/min is controlled, in the casting of rotation Molten bath and solidification forming are formed in roller and the crystallizer of side seal board composition, Cast Strip thickness is 1.5mm;
Cast Strip goes out after roller under inert atmosphere conditions, is cooled to 950 DEG C with the rate of 50 DEG C/s, then carries out hot rolling, open 950 DEG C of temperature, 850 DEG C of finishing temperature are rolled, hot rolled strip is made in drafts 10%, and hot rolled strip is cold with the rate of 20 DEG C/s But it is batched to 650 DEG C;
By hot-rolled strip pickling to remove oxide, 6 passage cold rolling of single phase, overall reduction 88.9%, per pass are then carried out Secondary drafts is 13~15%, obtains cold-rolled strip, thickness 0.15mm;
Cold-rolled strip by continuous annealing is heat-treated, recrystallization annealing, time 180s are carried out, then tie at 950 DEG C Crystalline substance annealing carries out under the conditions of nitrogen hydrogen mixed gas atmosphere (the hydrogen volume ratio of the present embodiment is 40%), controls mixed atmosphere Dew point at -35 DEG C, be then coated with insulating layer and dry, obtain final finished.Magnetic property P10/400For 10.0W/kg, magnetic strength B50 For 1.72T.
Embodiment 3
In the present embodiment, method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, by following step It is rapid to carry out:
By set component smelting molten steel, ingredient is by weight percentage:C 0.004%, Si 3.0%, Mn 0.2%, Al 0.0015%, P 0.03%, S 0.0018%, surplus Fe;
Strip casting process:Molten steel is entered into tundish by cast gate, 1250 DEG C of tundish preheating temperature controls the degree of superheat It it is 20 DEG C, molten steel enters strip casting machine by tundish, liquid level 100mm, teeming speed 70m/min is controlled, in the casting of rotation Molten bath and solidification forming, thickness 1.2mm are formed in roller and the crystallizer of side seal board composition;
Cast Strip goes out after roller under inert atmosphere conditions, is cooled to 900 DEG C with the rate of 70 DEG C/s, then carries out hot rolling, open 900 DEG C of temperature, 800 DEG C of finishing temperature are rolled, hot rolled strip is made in drafts 10%, and hot rolled strip is cold with the rate of 30 DEG C/s But it is batched to 650 DEG C;
By hot-rolled strip pickling to remove oxide, 8 passage cold rolling of single phase is then carried out, overall reduction 89%, every time Drafts is 10~12%, obtains cold-rolled strip, thickness 0.12mm;
Cold-rolled strip by continuous annealing is heat-treated, recrystallization annealing, time 180s are carried out, then tie at 950 DEG C Crystalline substance annealing carries out under the conditions of nitrogen hydrogen mixed gas atmosphere (the hydrogen volume ratio of the present embodiment is 60%), controls mixed atmosphere Dew point at -40 DEG C, be then coated with insulating layer and dry, obtain final finished.Magnetic property P10/400For 8.35W/kg, magnetic strength B50 For 1.70T.
Embodiment 4
In the present embodiment, method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, by following step It is rapid to carry out:
By set component smelting molten steel, ingredient is by weight percentage:C 0.0025%, Si 4.5%, Mn 0.2%, Al 0.002%, P 0.045%, S 0.0012%, surplus Fe;
Strip casting process:Molten steel is entered into tundish by cast gate, 1250 DEG C of tundish preheating temperature controls the degree of superheat It it is 20 DEG C, molten steel enters strip casting machine by tundish, liquid level 75mm, teeming speed 90m/min is controlled, in the casting roll of rotation With forming molten bath and solidification forming, thickness 1.0mm in the crystallizer of side seal board composition;
Cast Strip goes out after roller under inert atmosphere conditions, is cooled to 900 DEG C with the rate of 70 DEG C/s, then carries out hot rolling, open 900 DEG C of temperature, 800 DEG C of finishing temperature are rolled, hot rolled strip is made in drafts 10%, and hot rolled strip is cold with the rate of 30 DEG C/s But it is batched to 650 DEG C;
By hot-rolled strip pickling to remove oxide, 8 passage cold rolling of single phase is then carried out, overall reduction 85%, every time Drafts is 10~12%, obtains cold-rolled strip, thickness 0.1mm;
Cold-rolled strip by continuous annealing is heat-treated, recrystallization annealing, time 180s are carried out, then tie at 950 DEG C Crystalline substance annealing carries out under the conditions of nitrogen hydrogen mixed gas atmosphere (the hydrogen volume ratio of the present embodiment is 30%), controls mixed atmosphere Dew point at -45 DEG C, be then coated with insulating layer and dry, obtain final finished.Magnetic property P10/400For 7.2W/kg, magnetic strength B50For 1.66T。
Embodiment the result shows that, method of the invention be based on strip continuous casting technology, simplify technique, reduce production cost, carry The high magnetic property of non-orientation silicon steel Thin Specs finished product.

Claims (6)

  1. A kind of 1. method that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, which is characterized in that by following Step carries out:
    (1)By set component smelting molten steel, ingredient is by weight percentage:C≤0.006%, Si 2.0 ~ 4.5 %, Mn 0.2 ~ 0.4%, Al≤0.003%, P 0.02 ~ 0.06%, S≤0.003%, surplus are Fe and inevitable impurity;
    (2)Strip casting process:Molten steel is entered into tundish, 1200 ~ 1250 DEG C of tundish preheating temperature by cast gate, control is melted The degree of superheat is 10 ~ 30 DEG C in pond, and molten steel, which is entered by tundish after strip casting machine, forms Cast Strip, 60 ~ 90m/ of control teeming speed Min controls molten metal pool level 75 ~ 120mm of height, controls Cast Strip 1.0 ~ 1.5mm of thickness;Based on thin strap continuous casting moulding process, molten steel Strip casting machine is entered by tundish, molten bath is formed in the crystallizer that is formed with side seal board of casting roll of rotation and is frozen into Shape;
    (3)Cast Strip naturally cools to hot-rolling mill, 900 ~ 950 DEG C of hot-rolled temperature, finishing temperature under inert atmosphere conditions after going out roller 800 ~ 850 DEG C, drafts 10 ~ 15% batches after hot rolling, 640 ~ 660 DEG C of coiling temperature;
    (4)Single phase multi-pass cold rolling is carried out after hot rolling is cleaned up oxide skin, overall reduction is 80 ~ 90%, obtains cold-rolled strip Volume;
    (5)Cold-rolled strip by continuous annealing is heat-treated, carries out recrystallization annealings at 850 ~ 950 DEG C, the time for 120 ~ 180s, recrystallization annealing carry out under the conditions of nitrogen hydrogen mixed gas atmosphere, control the dew point of mixed atmosphere at -30 DEG C hereinafter, so Insulating layer coating is applied afterwards and is dried, and obtains high-performance non-orientation silicon steel thin slab product.
  2. 2. the method according to claim 1 that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, It is characterized in that, the non-orientation silicon steel is controlled using ultralow Al, Mn content.
  3. 3. the method according to claim 1 that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, It is characterized in that, the non-orientation silicon steel Cast Strip thickness is 1.0 ~ 1.5mm, by 10 ~ 15% drafts hot rolling and 80 ~ 90% 0.1 ~ 0.2mm of belt steel thickness after drafts cold rolling.
  4. 4. the method according to claim 1 that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, It is characterized in that, the non-orientation silicon steel magnetic property is:P10/400For 7.2 ~ 11W/kg, magnetic strength B50For 1.68 ~ 1.75T.
  5. 5. the method according to claim 1 that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, It is characterized in that, the step(4)In, the draught per pass of single phase multi-pass cold rolling is 10 ~ 20%.
  6. 6. the method according to claim 1 that non-oriented silicon steel with high magnetic induction thin slab product is prepared based on thin strap continuous casting, It is characterized in that, the step(5)In, the hydrogen volume ratio of nitrogen hydrogen mixed gas atmosphere is 20% ~ 60%.
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