CN101210297B - Method for preparing tropism silicon steel - Google Patents

Method for preparing tropism silicon steel Download PDF

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Publication number
CN101210297B
CN101210297B CN2006101558379A CN200610155837A CN101210297B CN 101210297 B CN101210297 B CN 101210297B CN 2006101558379 A CN2006101558379 A CN 2006101558379A CN 200610155837 A CN200610155837 A CN 200610155837A CN 101210297 B CN101210297 B CN 101210297B
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temperature
rolling
continuous
continuous casting
inhibitor
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CN101210297A (en
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高振宇
金文旭
张智义
李文权
孙群
罗理
方恩俊
张仁波
王开宇
谷春阳
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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Abstract

The invention discloses a manufacture method of an oriented silicon steel, which adopts smelting, continuous casting, heating, rough rolling, finish rolling, normalizing, cold rolling and heat treatment processes. The method is characterized in that continuous bending, continuous straightening, low-head vertical-bending medium-thin slab caster is adopted, the tundish superheat is 15 to 45 DEG C, the drawing speed is 2 to 4 m/min, the temperature gradient of a cast strand is 80 to 200 DEG C/mm, the surface temperature is 850 to 1,150 DEG C, the slab thickness is 100 to 170 mm, the surface charging temperature of a section cast strand and a continuous cast strand is not less than 800 DEG C, and the heating speed is larger than 5 DEG C/min; and a hot coil box is adopted after rough rolling, the cold rolling is achieved by single-frame rolling or multi-frame once or twice cold rolling, the temperature of a steel strip entering a finishing mill is 1,100 to 1,250 DEG C, the output temperature of the finishing mill is larger than 800 DEG C, and laminar cooling is adopted after rolling to reach a final cooling temperature of 400 to 800 DEG C. By controlling the state of a depressant in continuous casting and by adopting high-temperature, short-time and rapid hot rolling process, etc, the invention can achieve uniform product performance, high quality, reduced energy consumption as well as high efficiency.

Description

A kind of manufacture method of orientation silicon steel
Technical field
The invention belongs to metallurgical technology field, relate to hot continuous rolling and produce the silicon steel method, specifically is a kind of orientation silicon steel board fabrication method.
Background technology
Orientation silicon steel production generally is to adopt straight circular-arc type continuous casting machine, strand is thick to be more than the 200mm, because this slab thickness is bigger, cool time is longer, casting blank surface temperature is lower, it is bigger that inhibitor in the steel is separated out size, and the production characteristics of this strand are to adopt higher temperature and long period heating to make its inhibitor solid solution, reach the purpose of producing orientation silicon steel.
Another kind is to adopt the CSP of thinner thickness to produce, but this production line adopts the continuous tunnel furnace heating, and heat time heating time and temperature can not guarantee, fully solid solution of inhibitor, the production characteristics of this strand are to adopt strand cooling and temperature are controlled, and reach the purpose of producing orientation silicon steel.
Because the development that continuous casting is produced, between above-mentioned medium thin slab between the two with its productivity ratio height, cost is low, continuous casting is effective etc., and advantage more and more receives publicity, the important process that this technology has now become continuous casting to produce, this medium thin slab becomes an important development direction.But because the particularity of silicon steel production technology, this medium thin slab is produced orientation silicon steel and is run into following problem:
1 does not have ripe production technology, because having the inhibitor of heavy slab field trash thicker and sheet billet simultaneously, medium thin slab production orientation silicon steel is difficult for problems such as come-up, though weaken to some extent, solve but still need to adopt rational technological measure to add, adopt the heavy slab production method not realize.
2 degree of supercoolings select the unreasonable strand component segregation that causes serious, and it is stable to influence properties of product.
3 because the relative heavy slab of slab is thinner, and reduction ratio is less, and is unfavorable to the field trash fragmentation, influences end properties.
Slab is not incubated measure behind the 4 present conventional sheet billet continuous castings, and the slab temperature drop is very fast, causes inhibitor to separate out in a large number and grow up.
Generally expose when temperature is treated in 5 roughing on roller-way, inhomogeneous cooling is even, and the coiled sheet temperature difference is bigger, and precipitate is inhomogeneous everywhere, causes performance to produce bigger fluctuation.
Summary of the invention
The objective of the invention is to disclose a kind of manufacture method of orientation silicon steel, bow at the continuous bend continuous straightening and upright to produce orientation silicon steel on the thin sheet continuous casting machine in curved, by control inhibitor state during continuous casting, and adopt high temperature, in short-term, hot-rolled heating technology fast.Realize energy-conservation, purpose efficiently.
The object of the present invention is achieved like this, and technological process is smelting-continuous casting-heating-roughing-finish rolling-normalizing-cold rolling-heat treatment, and its characteristics are,
The continuous casting conticaster is bowed for the continuous bend continuous straightening and is found curved middle thin sheet continuous casting machine, adopt 15~45 ℃ of the less middle bag degrees of superheat, adopt the pulling rate production of 2~4m/min in the casting process, after the front end base hull shape of crystallizer becomes, reduce cooling velocity, and guarantee that the liquid heart ends at the casting machine end.
Inhibitor separate out fast and the scope of 1000~1250 ℃ of the temperature of growing up in, improve cooling velocity 15-20%, make that the billet surface inhibitor is tiny separates out, and heart portion temperature keeps higher temperature, strand forms bigger 80~200 ℃/mm of thermograde, surface temperature reaches 850~1150 ℃, and the inner inhibitor of assurance strand is not separated out.
Adopting thickness is 100~170mm section casting blank, can guarantee the abundant come-up of field trash, can guarantee that again steel billet has higher temperature, has reduced the heating-up temperature of steel billet.Casting blank solidification speed is fast, the reduction gross segregation.
The roller-way that the has stay-warm case heating furnace of directly packing into is adopted in continuous casting billet cutting back, goes into stove billet surface temperature 〉=800 ℃, and described stay-warm case is omnidistance formula.
Adopt bigger firing rate, firing rate>5 ℃/min raise casting blank surface temperature rapidly, and the quick solid solution of the inhibitor that the surface is separated out is in strand, and heart portion inhibitor still remains on solid solution condition after casting.
Adopt Coil Box after the roughing, make the steel band bulk temperature evenly and be in inhibitor and separate out more than the temperature, guarantee that inhibitor do not separate out.Distortion after steel band enters finishing mill when temperature is separated out temperature near inhibitor, phase transformation and temperature drop impel the inhibitor disperse to separate out.When head carried out the hot rolling unit, the steel band afterbody reached unanimity the steel band head and tail temperature still in Coil Box.
Hot rolled plate is made a practice of and is handled, and hot rolled plate is through laser welder welding, pickling.
Adopt rolling or multimachine frame once cold rolling mode of single chassis or secondary cold-rolling mode cold rolling.
It is 1100~1250 ℃ that steel band enters the finishing mill temperature, goes out tandem rolling unit temperature>800 ℃, adopts the laminar flow cooling after rolling immediately, and final cooling temperature is 400~800 ℃.
Cold rolling back steel band through the decarburizing annealing of continuous annealing furnace wet hydrogen, be coated with separation layer, secondary recrystallization and purify operations such as annealing, hot-leveling and make finished product.
Advantage of the present invention and effect are:
1 adopts the less degree of superheat, makes the molten steel rapid solidification, and there is steel billet in inhibitor with the solid solution attitude in the steel, reduces hot rolling heating-up temperature subsequently and time, reduces segregation.
2 select the vertical bending type casting machine for use, in that vertically the section cooling rate is slower, guarantee that the field trash of steel fully floats, and enhance product performance.
3 control strand cooling rates make the billet surface temperature higher, and steel billet heart portion temperature reaches the purpose that reduces heat time heating time more than the inhibitor solid solubility temperature.
Adopt the stay-warm case insulation behind 4 continuous castings before the steel billet shove charge, reduce thermal loss, avoid inhibitor to separate out and grow up.
After the 5 hot rolling roughing, adopt Coil Box to treat temperature, make temperature of steel strips even, the steel band inhibitor is separated out with advancing a large amount of disperses fast, the iron loss fluctuation is reduced about 0.2W/kg, the magnetic strength fluctuation reduces about 0.01T.
6 have reduced slab heating temperature, have reduced the maintenance number of times of heating furnace, improve labour intensity, improve output; The intermediate blank temperature is even, and the inhibitor disperse is separated out, and suppresses effect and improves.
The specific embodiment
Technological process of the present invention is smelting-continuous casting-heating-roughing-finish rolling-normalizing-cold rolling-heat treatment; its characteristics are; the continuous casting conticaster is bowed for the continuous bend continuous straightening and is found curved middle thin sheet continuous casting machine; adopt 15~45 ℃ of the less middle bag degrees of superheat; adopt the pulling rate production of 2~4m/min clock in the casting process; after the front end base hull shape of crystallizer becomes, reduce cooling velocity, and guarantee that the liquid heart ends at the casting machine end.
Inhibitor separate out fast and the scope of 1000~1250 ℃ of the temperature of growing up in, improve cooling velocity 15%~20%, make that the billet surface inhibitor is tiny separates out, and heart portion temperature keeps higher temperature, strand forms bigger 80~200 ℃/mm of thermograde, surface temperature reaches 850~1150 ℃, and the inner inhibitor of assurance strand is not separated out.
Adopting thickness is 100~170mm section casting blank, can guarantee the abundant come-up of field trash, can guarantee that again steel billet has higher temperature, has reduced the heating-up temperature of steel billet.Casting blank solidification speed is fast, the reduction gross segregation.
The roller-way that the has stay-warm case heating furnace of directly packing into is adopted in continuous casting billet cutting back, goes into stove billet surface temperature 〉=800 ℃.
Adopt bigger firing rate, firing rate>5 ℃/min raise casting blank surface temperature rapidly, and the quick solid solution of the inhibitor that the surface is separated out is in strand, and heart portion inhibitor still remains on solid solution condition after casting.
Adopt Coil Box after the roughing, make the steel band bulk temperature evenly and be in inhibitor and separate out more than the temperature, guarantee that inhibitor do not separate out.Distortion after steel band enters finishing mill when temperature is separated out temperature near inhibitor, phase transformation and temperature drop impel the inhibitor disperse to separate out.When head carried out the hot rolling unit, the steel band afterbody reached unanimity the steel band head and tail temperature still in Coil Box.
Hot rolled plate is made a practice of and is handled; hot rolled plate is through laser welder welding, pickling; adopt rolling or multimachine frame once cold rolling mode of single chassis or secondary cold-rolling mode cold rolling; it is 1100~1250 ℃ that steel band enters the finishing mill temperature; go out tandem rolling unit temperature>800 ℃; adopt the laminar flow cooling after rolling immediately, final cooling temperature is 400~800 ℃.
Introduce several most preferred embodiments of the present invention below:
1 one-tenth component selections (Wt%)
? C? Si? Mn? S? Als? N? Cu? Fe+ impurity
Embodiment 1 0.05? 3.25? 0.07? 0.03? 0.02? 0.007? 0.01? Surplus
Embodiment 2 0.06? 3.20? 0.08? 0.03? 0.03? 0.008? 0.01? Surplus
For embodiment 1,
Continuous casting adopts the continuous bend continuous straightening to bow and founds curved middle thin sheet continuous casting machine, and the middle bag degree of superheat is 18 ℃, adopts the pulling rate production of 2.5m/min in the casting process.Casting blank surface temperature remains on more than 1000 ℃ during continuous casting, form bigger thermograde (120~200 ℃/mm), continuous casting rear surface temperature reaches 1050~1150 ℃, slab thickness is 135mm, strand cuts off the back and adopts the stay-warm case insulation, and adopts roller-way to enter the heating furnace heating fast, adopts the stay-warm case insulation after the roughing, when temperature reached 1160 ℃, it was rolling to enter finishing mill fast.Go out 800~850 ℃ of tandem rolling unit temperature, adopt the laminar flow cooling after rolling immediately, final cooling temperature is 400~700 ℃.
Hot rolled plate is through laser welder welding, pickling, cold rolling.Carry out recrystallization annealing then and make high magnetic induction grain-oriented silicon steel.
For embodiment 2
Continuous casting adopts the continuous bend continuous straightening to bow and founds curved middle thin sheet continuous casting machine, and the middle bag degree of superheat is 15 ℃, adopts the pulling rate production of 2.3m/min in the casting process.Casting blank surface temperature remains on more than 1000 ℃ during continuous casting, form bigger thermograde (100~180 ℃/mm), continuous casting rear surface temperature reaches 1000~1100 ℃, slab thickness is 150mm, strand cuts off the back and adopts the stay-warm case insulation, and adopts roller-way to enter the heating furnace heating fast, adopts the stay-warm case insulation after the roughing, when temperature reached 1165 ℃, it was rolling to enter finishing mill fast.Go out 820~860 ℃ of tandem rolling unit temperature, adopt the laminar flow cooling after rolling immediately, improve cooling velocity 15%~20%, final cooling temperature is 450~700 ℃.
Hot rolled plate is through laser welder welding, pickling, cold rolling.Carry out recrystallization annealing then and make high magnetic induction grain-oriented silicon steel.
2 with conventional products contrast
Project The strand proportion of equiaxed grain Iron loss P1.7 difference end to end Magnetic strength B8 difference end to end Field trash total amount ppm Strand min heat time heating time
Embodiment 1 65? 0.30? 0.030? 182? 150?
Embodiment 2 72? 0.25? 0.025? 194? 150?
Comparative Examples 1 80? 0.51? 0.035? 250? 240?
Comparative Examples 2 85? 0.43? 0.032? 243? 240?

Claims (2)

1. the manufacture method of an orientation silicon steel adopts following production technology, and smelting-continuous casting-heating-roughing-finish rolling-normalizing-cold rolling-heat treatment is characterized in that,
A adopts the continuous bend continuous straightening to bow and founds curved middle thin sheet continuous casting machine, and 15~45 ℃ of the middle bag degrees of superheat adopt the pulling rate production of 2~4m/min in the casting process;
B inhibitor separate out fast and the scope of 1000~1250 ℃ of the temperature of growing up in, improve cooling velocity 15%~20%, 80~200 ℃/mm of thermograde of strand, 850~1150 ℃ of surface temperatures;
The c slab thickness is 100~170mm section casting blank;
The roller-way that the has stay-warm case heating furnace of directly packing into is adopted in d continuous casting billet cutting back, goes into stove billet surface temperature 〉=800 ℃, firing rate>5 ℃/min;
Adopt Coil Box after the e roughing, make the steel band bulk temperature evenly and temperature be higher than inhibitor and separate out temperature;
It is 1100~1250 ℃ that the f steel band enters the finishing mill temperature, and finishing temperature>800 ℃ are adopted the laminar flow cooling immediately after rolling, and final cooling temperature is 400~800 ℃;
2. the manufacture method of a kind of orientation silicon steel according to claim 1 is characterized in that, described stay-warm case is omnidistance formula.
CN2006101558379A 2006-12-27 2006-12-27 Method for preparing tropism silicon steel Active CN101210297B (en)

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Families Citing this family (14)

* Cited by examiner, † Cited by third party
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CN101660035B (en) * 2008-08-25 2012-02-01 鞍钢股份有限公司 Method for manufacturing electric steel with excellent longitudinal magnetic performance
CN101433911B (en) * 2008-12-30 2011-02-23 北京科技大学 Method for producing low cost oriented silicon steel using continuous casting and rolling technique of sheet bar
CN101927263B (en) * 2009-06-24 2012-04-04 鞍钢股份有限公司 Method for improving rolling stability of container thin material
CN102145349B (en) * 2010-02-08 2012-12-19 鞍钢股份有限公司 Method for stably controlling finishing rolling temperature of oriented silicon steel
JP5668440B2 (en) * 2010-12-03 2015-02-12 Jfeスチール株式会社 Hot rolling method for silicon-containing steel slabs
CN102560235B (en) * 2010-12-17 2014-01-01 鞍钢股份有限公司 Manufacturing method of high-magnetic-inductive oriented silicon steel
JP5790276B2 (en) * 2011-08-08 2015-10-07 東芝三菱電機産業システム株式会社 Directional electrical steel sheet production line and induction heating device
CN103031426B (en) * 2011-09-29 2015-07-08 鞍钢股份有限公司 Method for improving performance of non-oriented electrical steel efficient and high-grade product
CN103212584B (en) * 2012-01-20 2015-03-04 五冶集团上海有限公司 Method for controlling off-tracking of band steel of oriented silicon steel ultra-long multi-track horizontal loop
CN103882203A (en) * 2012-12-21 2014-06-25 鞍钢股份有限公司 Hot rolling method for improving electromagnetic performance of silicon steel
CN104438359B (en) * 2013-10-29 2017-05-10 上海宝信软件股份有限公司 Method for increasing temperature of head of hot rolled strip steel
CN104726670B (en) * 2013-12-23 2017-07-21 鞍钢股份有限公司 A kind of method that short route medium thin slab prepares high magnetic induction grain-oriented silicon steel
CN104726667B (en) * 2013-12-23 2017-04-26 鞍钢股份有限公司 Production method of medium thin slab continuous casting and continuous rolling low-temperature oriented silicon steel
CN108480587B (en) * 2018-02-13 2020-02-18 鞍钢股份有限公司 Production method of low-inclusion-defect-rate high-magnetic-induction oriented silicon steel

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JP2002212639A (en) * 2001-01-12 2002-07-31 Nippon Steel Corp Method for producing grain oriented silicon steel sheet having excellent magnetic property
CN1743127A (en) * 2005-09-29 2006-03-08 东北大学 Method for producing oriented silicon steel band by continuous casting and rolling of thin plate slab

Patent Citations (2)

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JP2002212639A (en) * 2001-01-12 2002-07-31 Nippon Steel Corp Method for producing grain oriented silicon steel sheet having excellent magnetic property
CN1743127A (en) * 2005-09-29 2006-03-08 东北大学 Method for producing oriented silicon steel band by continuous casting and rolling of thin plate slab

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