CN106001108B - A kind of milling method of low cost oriented silicon steel - Google Patents

A kind of milling method of low cost oriented silicon steel Download PDF

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CN106001108B
CN106001108B CN201610342989.3A CN201610342989A CN106001108B CN 106001108 B CN106001108 B CN 106001108B CN 201610342989 A CN201610342989 A CN 201610342989A CN 106001108 B CN106001108 B CN 106001108B
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silicon steel
rolling
low cost
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milling method
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CN106001108A (en
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冯运莉
李�杰
郭婧
杜田田
王海蛟
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North China University of Science and Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force

Abstract

The invention discloses a kind of milling method of low cost oriented silicon steel, the hot rolled rear progress cold rolling of strand of the orientation silicon steel；The hot rolling includes heating, roughing and finishing stands；In the rough rolling process, two passages use multidirectional rolling before roughing, then carry out unidirection rolling；In the finishing stands, finishing temperature is not less than 1050 DEG C, and finish to gauge single pass reduction ratio is more than 30%, and 780~820 DEG C are cooled to by finishing temperature with 7~12min after rolling.This method is by controlling course of hot rolling; inhibitor is set to separate out appropriate number of inhibitor during hot rolling deformation and roller repairing; and Dispersed precipitate is in the base; so as to omit the Hot Rolled Plate Normalizing treatment process before cold rolling; simplify the production technology of orientation silicon steel; the production cost and energy consumption of orientation silicon steel are reduced, improves production efficiency；Hot rolled plate obtains the tissue and texture of orientation silicon steel requirement after pickling, once cold rolling, intermediate annealing, secondary cold-rolling, reply, high annealing, and its magnetic property is up to state standards defined magnetic property requirements.

Description

A kind of milling method of low cost oriented silicon steel
Technical field
The present invention relates to a kind of preparation method of orientation silicon steel, especially a kind of milling method of low cost oriented silicon steel.
Background technology
Silicon steel sheet is also referred to as electromagnetic steel plate or electric steel plate, is described as " art work in steel ", is electric power, electronics and military project Indispensable important soft magnetic alloy in cause.Dosage of the silicon steel steel plate in magnetic material is maximum, accounts for magnetic material dosage 90%~95%, silicon steel development of the production with national economy and people's lives are closely bound up, are played an important role to energy-saving.
According to different use ranges, silicon steel can be divided into suitable for transformer's type directional magnetic field orientation silicon steel and Suitable for the major class of non-orientation silicon steel two of electric machinery rotating excitation field.Magnetocrystalline anisotropy and pole of the orientation silicon steel using ferrous metals Strong Goss texture (i.e. { 110 }<001>Texture) magnetic property extremely excellent on steel plate rolling direction is caused, it is all kinds of transformations The directional magnetic field such as device, ballast, amplifier, voltage-stablizer, relay, rectifier, electromagnetic switch electric equipment products make the core of iron core Core material.Orientation silicon steel mainly by its specific constituent reduction eddy-current loss, using Goss be orientated crystal grain roll it is excellent upwards Magnetization property, reduce that mangneto be lost and to increase substantially magnetic strength horizontal.
Orientation silicon steel is a kind of very high steel products of technology content, main feature be exactly finally to obtain it is highly oriented {110}<001>Texture is Goss texture, there is longer production cycle, very complicated production technology；Its rolling mill practice includes heat Roll, normalizing and cold rolling process.In process of production, most of steel mill is in order to simplify production technology, shortening is given birth to for orientation silicon steel The cycle is produced, the purpose for reducing production cost is finally reached, is intended to use more compact, more cheap production technology.Therefore develop It is current orientation silicon steel production urgent problem that the orientation silicon steel of production cost and its production technology, which can be reduced,.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of milling method of the simple low cost oriented silicon steel of technique.
In order to solve the above technical problems, the technical solution used in the present invention is：The strand of the orientation silicon steel is hot rolled After carry out cold rolling；The hot rolling includes heating, roughing and finishing stands；In the rough rolling process, two passages use more before roughing To rolling, then carry out unidirection rolling；In the finishing stands, finishing temperature is not less than 1050 DEG C, and finish to gauge single pass reduction ratio is big In 30%, 780~820 DEG C are cooled to by finishing temperature with 7~12min after rolling.
In heating process of the present invention, heating strand carries out roughing to 1150~1250 DEG C again.
Slab thickness of the present invention is 75~180mm, and it is 1.2~3.8mm to be hot-rolled down to thickness.
The coiling temperature of hot rolling of the present invention is 700~780 DEG C.
The weight percentage of orientation silicon steel chemical composition of the present invention is：C 0.04~0.06%, Si 2.80~ 3.40%, Mn 0.04~0.06%, Nb 0.04~0.10%, S 0.01~0.02%, N 0.0085~0.012%, Als 0.015~0.025%, Cu 0.06~0.07%, Cr≤0.03%, P≤0.015%, surplus be Fe and inevitably it is miscellaneous Matter.
Preferably, the weight percentage of the orientation silicon steel chemical composition is：C 0.04~0.06%, Si 3.0~ 3.30%, Mn 0.04~0.05%, Nb 0.05~0.08%, S 0.015~0.02%, N 0.0085~0.010%, Als 0.015~0.020%, Cu 0.06~0.07%, Cr≤0.03%, P≤0.01%, surplus are Fe and inevitable impurity.
Two passages use multidirectional rolling before roughing of the present invention, i.e., the rolled piece after the first passes overturns 90 °, by width Direction is changed into short transverse, then carries out the second passes, primarily to the column crystal in fully broken strand, refines Ovshinsky Body tissue, the heterogeneous structure to be formed during subsequent hot rolled on hot rolling plate thickness direction lay the foundation.Present invention control is eventually Temperature is rolled not less than 1050 DEG C, and finish to gauge single pass reduction ratio is more than 30%, is on the one hand to make dislocation, sky inside material structure The defects of position, increases, and storage can increase, and the precipitation for inhibitor such as the carbonitrides of niobium provides driving force；And combine roller repairing The control of speed, that is, 780~820 DEG C are cooled to by finishing temperature with 7~12min time after rolling, make the carbonitride etc. of niobium Inhibitor can separate out suitable quantity, and control the size of inhibitor to have the inhibitor in hot rolled plate in the range of 7~80nm Enough abilities suppress growing up for primary recrystallization crystal grain, so as to obtain tiny primary recrystallization crystal grain.On the other hand can make The inhomogeneities of hot rolled plate through-thickness tissue is more notable, i.e., top layer can obtain more tiny recrystal grain, secondary table Layer forms thicker reply crystal grain and a small amount of recrystal grain, and central core is then the deformed grains of thick elongation, hot rolled plate this The uneven microscopic structure of kind plays an important role to developing perfect secondary recrystallization.
It is using beneficial effect caused by above-mentioned technical proposal：The present invention is by controlling the technique of course of hot rolling to join Number, makes inhibitor separate out appropriate number of inhibitor during hot rolling deformation and roller repairing, and Dispersed precipitate is in the base, So as to omit the Hot Rolled Plate Normalizing treatment process before cold rolling, simplify the production technology of orientation silicon steel, reduce the production of orientation silicon steel Cost and energy consumption, improve production efficiency.Hot rolled plate after hot rolling of the present invention is without normalizing treatment, through pickling, once cold rolling, centre The tissue and texture of orientation silicon steel requirement are obtained after annealing, secondary cold-rolling, reply, high annealing, its magnetic property reaches national mark Magnetic property requirements as defined in standard.
Embodiment
The milling method of this low cost oriented silicon steel includes hot-rolled process and cold rolling process.The hot-rolled process includes adding Heat, roughing and finishing stands.In the heating process, heating strand enters rough rolling process to 1150~1250 DEG C.The roughing During, two passages use multidirectional rolling before roughing, i.e., the rolled piece after the first passes overturns 90 °, and width is become For short transverse, then the second passes are carried out, with the column crystal and crystal grain thinning in fully broken strand；Unidirectionally rolled again System.In the finishing stands, finishing temperature is not less than 1050 DEG C, and finish to gauge single pass reduction ratio is more than 30%, with 7~12min after rolling 780~820 DEG C are cooled to by finishing temperature；Coiling temperature is 700~780 DEG C.The hot-rolled process is by strand by 75~180mm Thickness, it is hot-rolled down to 1.2~3.8mm thickness.The cold rolling process include pickling, once cold rolling, intermediate annealing, secondary cold-rolling, return Multiple and high-temperature annealing process, it can use and be conventionally orientated silicon steel secondary cold-rolling production technology.
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1：The milling method of this low cost oriented silicon steel uses following concrete technologies.
The weight percentage of the chemical composition of orientation silicon steel is：C 0.04%, Si 2.8%, Mn 0.06%, Nb 0.04%, S 0.02%, N 0.012%, Als 0.025%, Cu 0.07%, Cr 0.03%, P 0.015%, surplus Fe With inevitable impurity.
Rolling mill practice：By the thick slabs of 120mm（Strand）Roughing is carried out after 1250 DEG C of insulations are heated in soaking pit.Slightly Preceding two passage for rolling process uses multidirectional rolling, i.e., the rolled piece after the first passes overturns 90 °, and width is changed into high Direction is spent, then carries out the second passes；Then carry out unidirection rolling.The finishing temperature of finishing stands is 1100 DEG C, finish to gauge list Percentage pass reduction is 31%, hot rolling plate thickness 3.8mm；After rolling 800 DEG C are cooled to 12min time by finishing temperature；750℃ Batched.Hot rolled plate is without normalizing, according to tradition directed silicon steel secondary cold-rolling technique productions orientation silicon steel.After tested, gained The iron loss P of oriented silicon steel1.7=1.391w/kg, magnetic strength B8=1.809T, reach 30Q140 as defined in national standard GB2521-1996 Performance indications.
Embodiment 2：The milling method of this low cost oriented silicon steel uses following concrete technologies.
The weight percentage of the chemical composition of orientation silicon steel is：C 0.06%, Si 3.40%, Mn 0.04%, Nb 0.10%, S 0.010%, N 0.0085%, Als 0.015%, Cu 0.06%, Cr 0.02%, P 0.010%, surplus are Fe and inevitable impurity.
Rolling mill practice：Roughing is carried out after the thick slabs of 150mm are heated into 1150 DEG C of insulations in soaking pit.Rough rolling process Preceding two passage use multidirectional rolling, i.e., rolled piece after the first passes overturns 90 °, and width is changed into height side To, then carry out the second passes.Then carry out unidirection rolling.The finishing temperature of finishing stands is 1050 DEG C, finish to gauge single pass Reduction ratio is 33%, hot rolling plate thickness 3.0mm；After rolling 800 DEG C are cooled to 7min time by finishing temperature；730 DEG C are rolled up Take.Hot rolled plate is without normalizing, according to the secondary cold-rolling technique productions orientation silicon steel of tradition directed silicon steel.After tested, gained is orientated The iron loss P of silicon steel product1.7=1.382w/kg, magnetic strength B8=1.813T, reach the property of 30Q140 as defined in national standard GB2521-1996 Can index.
Embodiment 3：The milling method of this low cost oriented silicon steel uses following concrete technologies.
The weight percentage of the chemical composition of orientation silicon steel is：C 0.04%, Si 3.15%, Mn 0.05%, Nb 0.05%, S 0.017%, N 0.0092%, Als 0.015%, Cu 0.065%, Cr 0.03%, P 0.007%, surplus are Fe and inevitable impurity.
Rolling mill practice：Roughing is carried out after the thick slabs of 90mm are heated into 1200 DEG C of insulations in soaking pit.Rough rolling process Preceding two passage use multidirectional rolling, i.e., rolled piece after the first passes overturns 90 °, and width is changed into height side To, then carry out the second passes；Then carry out unidirection rolling.The finishing temperature of finishing stands is 1060 DEG C, finish to gauge single pass Reduction ratio is 34%, hot rolling plate thickness 2.2mm；After rolling 820 DEG C are cooled to 9min time by finishing temperature；780 DEG C are rolled up Take.Hot rolled plate is without normalizing, according to the secondary cold-rolling technique productions orientation silicon steel of tradition directed silicon steel.After tested, gained is orientated The iron loss P of silicon steel product1.7=1.363w/kg, magnetic strength B8=1.825T, reach the property of 30Q140 as defined in national standard GB2521-1996 Can index.
Embodiment 4：The milling method of this low cost oriented silicon steel uses following concrete technologies.
The weight percentage of the chemical composition of orientation silicon steel is：C 0.053%, Si 3.30%, Mn 0.048%, Nb 0.065%, S 0.020%, N 0.010%, Als 0.02%, Cu 0.07%, Cr 0.023%, P 0.009%, surplus are Fe and inevitable impurity.
Rolling mill practice：Roughing is carried out after the thick slabs of 180mm are heated into 1210 DEG C of insulations in soaking pit.Rough rolling process Preceding two passage use multidirectional rolling, i.e., rolled piece after the first passes overturns 90 °, and width is changed into height side To, then carry out the second passes；Then carry out unidirection rolling.The finishing temperature of finishing stands is 1070 DEG C, finish to gauge single pass Reduction ratio is 35%, hot rolling plate thickness 2.5mm；After rolling 810 DEG C are cooled to 10min time by finishing temperature；740 DEG C of progress Batch.Hot rolled plate is without normalizing, according to the secondary cold-rolling technique productions orientation silicon steel of tradition directed silicon steel.After tested, gained takes To the iron loss P of silicon steel product1.7=1.354w/kg, magnetic strength B8=1.832T, reach 30Q140 as defined in national standard GB2521-1996 Performance indications.
Embodiment 5：The milling method of this low cost oriented silicon steel uses following concrete technologies.
The weight percentage of the chemical composition of orientation silicon steel is：C 0.06%, Si 3.0%, Mn 0.040%, Nb 0.08%, S 0.015%, N 0.0085%, Als 0.018%, Cu 0.06%, Cr 0.026%, P 0.01%, surplus are Fe and inevitable impurity.
Rolling mill practice：Roughing is carried out after the thick slabs of 75mm are heated into 1240 DEG C of insulations in soaking pit.Rough rolling process Preceding two passage use multidirectional rolling, i.e., rolled piece after the first passes overturns 90 °, and width is changed into height side To, then carry out the second passes；Then carry out unidirection rolling.The finishing temperature of finishing stands is 1080 DEG C, finish to gauge single pass Reduction ratio is 36%, hot rolling plate thickness 1.2mm；After rolling 780 DEG C are cooled to 11min time by finishing temperature；700 DEG C of progress Batch.Hot rolled plate is without normalizing, according to the secondary cold-rolling technique productions orientation silicon steel of tradition directed silicon steel.After tested, gained takes To the iron loss P of silicon steel product1.7=1.329w/kg, magnetic strength B8=1.834T, reach 30Q140 as defined in national standard GB2521-1996 Performance indications.

Claims (6)

  1. A kind of 1. milling method of low cost oriented silicon steel, it is characterised in that：The hot rolled rear progress of strand of the orientation silicon steel Cold rolling；The hot rolling includes heating, roughing and finishing stands；In the rough rolling process, two passages use multidirectional rolling before roughing, Unidirection rolling is carried out again；In the finishing stands, finishing temperature is not less than 1050 DEG C, and finish to gauge single pass reduction ratio is more than 30%, rolls Afterwards 780~820 DEG C are cooled to 7~12min by finishing temperature.
  2. A kind of 2. milling method of low cost oriented silicon steel according to claim 1, it is characterised in that：The heating process In, heating strand carries out roughing to 1150~1250 DEG C again.
  3. A kind of 3. milling method of low cost oriented silicon steel according to claim 1, it is characterised in that：The slab thickness For 75~180mm, it is 1.2~3.8mm to be hot-rolled down to thickness.
  4. A kind of 4. milling method of low cost oriented silicon steel according to claim 1, it is characterised in that：The volume of the hot rolling It is 700~780 DEG C to take temperature.
  5. A kind of 5. milling method of low cost oriented silicon steel according to claim 1-4 any one, it is characterised in that The weight percentage of the orientation silicon steel chemical composition is：C 0.04~0.06%, Si 2.80~3.40%, Mn 0.04~ 0.06%, Nb 0.04~0.10%, S 0.01~0.02%, N 0.0085~0.012%, Als 0.015~0.025%, Cu 0.06~0.07%, Cr≤0.03%, P≤0.015%, surplus are Fe and inevitable impurity.
  6. A kind of 6. milling method of low cost oriented silicon steel according to claim 5, it is characterised in that the orientation silicon steel The weight percentage of chemical composition is：C 0.04~0.06%, Si 3.0~3.30%, Mn 0.04~0.05%, Nb 0.05~0.08%, S 0.015~0.02%, N 0.0085~0.010%, Als 0.015~0.020%, Cu 0.06~ 0.07%, Cr≤0.03%, P≤0.01%, surplus are Fe and inevitable impurity.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106583448B (en) * 2016-12-08 2018-10-16 武汉钢铁有限公司 The cold rolling process of Ultra-thin high magnetic induction grain-oriented silicon steel
CN109112283A (en) * 2018-08-24 2019-01-01 武汉钢铁有限公司 The preparation method of low temperature high magnetic induction grain-oriented silicon steel
CN112899457B (en) * 2021-01-14 2023-05-02 武汉钢铁有限公司 Heat treatment method capable of replacing high-magnetic induction oriented silicon steel normalizing annealing

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CN103071677A (en) * 2012-12-29 2013-05-01 东北大学 Method for preparing oriented silicon steel with asymmetrical rolling technique
CN103668005A (en) * 2013-12-12 2014-03-26 武汉钢铁(集团)公司 HiB steel produced at moderate slab heating temperature and production method thereof
CN103898409A (en) * 2014-04-26 2014-07-02 河北联合大学 Inhibitor reducing heating temperature of oriented silicon steel slab and preparation method thereof
WO2016059099A1 (en) * 2014-10-15 2016-04-21 Sms Group Gmbh Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process

Patent Citations (5)

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CN101353760A (en) * 2007-07-23 2009-01-28 宝山钢铁股份有限公司 High magnetic induction grain-oriented silicon steel and production method thereof
CN103071677A (en) * 2012-12-29 2013-05-01 东北大学 Method for preparing oriented silicon steel with asymmetrical rolling technique
CN103668005A (en) * 2013-12-12 2014-03-26 武汉钢铁(集团)公司 HiB steel produced at moderate slab heating temperature and production method thereof
CN103898409A (en) * 2014-04-26 2014-07-02 河北联合大学 Inhibitor reducing heating temperature of oriented silicon steel slab and preparation method thereof
WO2016059099A1 (en) * 2014-10-15 2016-04-21 Sms Group Gmbh Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process

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