CN111687210A - Method for producing 0.35mm non-oriented silicon steel by using cold continuous rolling mill - Google Patents

Method for producing 0.35mm non-oriented silicon steel by using cold continuous rolling mill Download PDF

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Publication number
CN111687210A
CN111687210A CN202010420065.7A CN202010420065A CN111687210A CN 111687210 A CN111687210 A CN 111687210A CN 202010420065 A CN202010420065 A CN 202010420065A CN 111687210 A CN111687210 A CN 111687210A
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rolling
pass
silicon steel
cold
oriented silicon
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Inventor
尚秀廷
陆斌
詹卢刚
薛越
郭勇
张秀清
张文博
马海良
朱晓丽
廖腾
杨海
郭志
刘朋成
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel Group Co Ltd
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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
    • B21B1/222—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 in a rolling-drawing process; in a multi-pass mill
    • 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
    • B21B1/24—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 in a continuous or semi-continuous process
    • B21B1/28—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 in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • 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
    • 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • 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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
    • B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
    • 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
    • B21B37/48—Tension control; Compression 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
    • B21B37/58—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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/04—Front or inlet tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/06—Interstand tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/08—Back or outlet tension
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/18—Roll crown; roll profile
    • B21B2267/19—Thermal crown

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Metal Rolling (AREA)

Abstract

The invention discloses a method for producing 0.35mm non-oriented silicon steel by using a cold continuous rolling mill, which adopts a one-step rolling method to carry out continuous five-rack cold rolling on a cold rolling raw material coil, controls the reduction rate, the rolling force, the tension between racks and the tension on the inlet side and the outlet side of each pass, adopts emulsion spraying to carry out process lubrication and cooling, and carries out a partition cooling mode on a working roll to control the thermal convexity of the working roll so as to adjust the shape of a steel strip, thus obtaining a non-oriented silicon steel intermediate product with the thickness of 0.35mm, and then carries out the working procedures of continuous annealing, coating and the like, thus finally obtaining the thin 0.35mm non-oriented silicon steel.

Description

Method for producing 0.35mm non-oriented silicon steel by using cold continuous rolling mill
Technical Field
The invention belongs to the technical field of silicon steel production, and particularly relates to a method for producing 0.35mm non-oriented silicon steel by using a cold continuous rolling mill.
Background
Silicon steel is an important soft magnetic material for industry, electric power and electronics. The grain orientation of the non-oriented silicon steel is random, the non-oriented silicon steel has uniform magnetic characteristics in all directions, and the non-oriented silicon steel is mostly adopted as an iron core material for iron cores of various types of motors and generators.
It is known that the thinner the silicon steel sheet, the smaller the iron loss, and the higher the energy utilization rate. Therefore, the production of thin-gauge silicon steel is an important means for saving energy. Especially for high-grade silicon steel products, the silicon steel is mainly used for stators and rotors of large generators, and motor iron cores of energy-saving household appliances, electric automobiles and the like, so that the production of the non-oriented silicon steel with the thin specification of 0.35mm is significant.
Disclosure of Invention
Aiming at one or more problems in the prior art, the invention provides a method for producing 0.35mm non-oriented silicon steel by using a cold continuous rolling mill, which comprises the following steps: smelting, continuous casting, hot rolling, cold rolling, continuous annealing and coating, wherein the thickness of a cold rolling raw material coil obtained after the hot rolling process is 1.8-2.0 mm; the cold rolling process adopts a one-time rolling method, and the cold rolling raw material coil is rolled by a continuous five-pass rolling mill which has a five-rack six-roller CVC roll shifting function, and a rolling roll system consists of a working roll, a middle roll and a supporting roll; wherein the intermediate roller and the supporting roller are CVC (composite variable crown) shifting rollers, the shifting amount is +/-120 mm, the roller diameter of the working roller is 420-470 mm, and the surface roughness of the working roller is less than or equal to 1.0 mu m; the total reduction rate of the steel strip in the rolling process is 80.5-83.0%, wherein the first pass reduction rate is 28.3-32.3%, the second and third pass reduction rates are 31.5-41.9%, the fourth pass reduction rate is 23.5-28.5%, the fifth pass reduction rate is 6.4-8.4%, the reduction rates from the second pass to the fifth pass are reduced with the pass, the rolling force from the first pass to the fourth pass is 10.21-12.61 MN, the rolling force from the fifth pass is 7-8.3 MN, and the entrance side unit tension range from the first pass to the fifth pass is 115-270N/mm2Coiling tension of 38N/mm2。
In the cold rolling procedure, emulsion spraying is adopted for process lubrication and cooling during rolling, the working rolls are cooled in a partition mode, the thermal convexity of the working rolls is controlled, the shape of the steel strip is adjusted, and the shape I value is controlled to be 2.8-7.5.
And (3) when the shape I value of the steel strip is controlled to be between 2.8 and 7.5, entering a constant-speed rolling stage, wherein the rolling speed is a certain fixed value between 450 and 600m/min, and the thickness range of a finished product is 0.35mm +/-0.0025 mm.
The concentration of the emulsion is 0.5-5.0%, the temperature is 50-60 ℃, the flow range of the emulsion in each pass is 1500-6000L/min, and the single-side spraying is adopted.
The thin non-oriented silicon steel with the thickness of 0.35mm obtained by the method also belongs to the content of the invention.
The method for producing the thin-gauge 0.35mm non-oriented silicon steel by using the cold continuous rolling mill based on the technical scheme comprises the steps of firstly welding the head and the tail of a hot rolled steel coil, pickling, preparing a cold rolled raw material coil by trimming and shearing edges, then carrying out continuous five-rack cold rolling on the cold rolled raw material coil by adopting a one-step rolling method, controlling the reduction rate, the rolling force, the tension between racks and the tension between the inlet side and the outlet side of each pass, carrying out process lubrication and cooling by adopting emulsion spraying, controlling the thermal convexity of a working roll by adopting a mode of cooling the working roll in a partition mode so as to adjust the shape of a steel strip, obtaining an intermediate product of the thin-gauge 0.35mm non-oriented silicon steel, and then carrying out continuous annealing, coating and other procedures to finally obtain the thin-gauge 0.35mm non-oriented silicon steel, wherein the thin-gauge 0.35mm non-oriented silicon.
Detailed Description
The present invention will be described in detail with reference to specific examples. It should be understood that the following examples are for illustrative purposes only and are not intended to limit the present invention.
Example 1:
in the embodiment, a five-frame CVC six-roller continuous rolling mill is adopted to produce the non-oriented silicon steel with the Si content of 1.2% and the plate width of 1250mm, and the method specifically comprises the following processes:
1) the method comprises the steps of using a conventional non-oriented silicon steel production process, smelting, continuous casting by a CSP continuous casting and continuous rolling machine, and hot rolling to obtain a hot-rolled steel coil with the thickness of 2.0mm, and performing straightening, acid pickling and trimming on the steel coil to obtain a cold-rolled raw material coil.
2) And (2) carrying out continuous five-pass cold rolling on the cold-rolled raw material coil obtained in the step 1) by adopting a one-time cold rolling method, wherein a pair of working rolls are adopted for rolling for five passes, the working rolls are flat rolls, the roll diameter is 450mm, the surface roughness of the working rolls is 0.55 mu m, the reduction rate, the rolling force and the unit tension of each pass are controlled, emulsion (such as cold-rolled emulsion of synthetic resin oil emulsion and the like) is sprayed during rolling for process lubrication and cooling, the emulsion is sprayed on one side, the emulsion concentration of the front 4 rolling mills is 4.2%, the emulsion concentration of the 5 th rolling mill is 0.6%, the emulsion temperature is 52 ℃, the steel coil shape is adjusted by controlling the thermal convexity of the working rolls through the CVC roll shifting function of the middle roll and the supporting roll and the partition cooling, and then the rolling speed is 550m/min, and the thickness of the rolled product is 0.35 mm. The parameters for rolling the silicon steel of the specification are shown in Table 1 below.
Table 1: raw material specification of 2.0mm multiplied by 1275mm and rolling parameters of silicon steel with 0.35mm multiplied by 1250mm
Rolling parameters First pass Second pass The third pass The fourth pass The fifth pass
Thickness of outlet side (mm) 1.374 0.812 0.5321 0.380 0.35
Pressing amount (mm) 0.626 0.562 0.280 0.152 0.031
Reduction ratio (%) 31.3％ 40.9％ 34.5％ 28.5％ 8.0％
Rolling power (MN) 12.58 12.43 12.6 10.96 8.21
Entry side unit tension (N/mm)2) 120 153 188 231 254
Emulsion flow (L/min) 1800 3500 3900 4300 5500
According to the rolling parameters, the plate shape I value range of the rolled silicon steel is 2.8-5.7, and the thickness of the finished product is controlled between 0.3475 mm-0.3525 mm. The plate shape and thickness tolerance after annealing meet the standard and the use requirement of users.
Example 2:
in the embodiment, a five-frame CVC six-roller continuous rolling mill is adopted to produce the non-oriented silicon steel with the Si content of 1.3% and the plate width of 1250mm, and the method specifically comprises the following processes:
1) the method comprises the steps of using a conventional non-oriented silicon steel production process, smelting, continuous casting by a CSP continuous casting and continuous rolling machine, and hot rolling to obtain a hot-rolled steel coil with the thickness of 1.8mm, and performing straightening, acid pickling and trimming on the steel coil to obtain a cold-rolled raw material coil.
2) And (2) carrying out continuous five-pass cold rolling on the cold-rolled raw material coil obtained in the step 1) by adopting a one-time cold rolling method, wherein a pair of working rolls are adopted for rolling for five passes, the working rolls are flat rolls, the roll diameter is 435mm, the surface roughness of the working rolls is 0.60 mu m, the reduction rate, the rolling force and the unit tension of each pass are controlled, emulsion spraying is adopted for process lubrication and cooling during rolling, the emulsion is sprayed on one side, the emulsion concentration of the front 4 rolling mills is 4.58%, the emulsion concentration of the 5 th rolling mill is 0.5%, the emulsion temperature is 55 ℃, the hot convexity of the working rolls is controlled through the CVC roll shifting function of the middle roll and the back-up roll and the partition cooling to adjust the shape of the steel coil, and then the steel coil enters a constant-speed rolling stage, the rolling speed is 500m/min, and the thickness of a rolled. The parameters for rolling the silicon steel of the specification are shown in Table 2 below.
Table 2: raw material specification of 1.8mm multiplied by 1275mm and rolling parameters of silicon steel with 0.35mm multiplied by 1250mm
Rolling parameters First pass Second pass The third pass The fourth pass The fifth pass
Thickness of outlet side (mm) 1.2547 0.7545 0.5019 0.3738 0.35
Pressing amount (mm) 0.5453 0.5002 0.2526 0.1281 0.0238
Reduction ratio (%) 30.3％ 39.9％ 33.5％ 25.5％ 6.4％
Rolling power (MN) 12.11 12.09 12.22 10.21 7
Entry side unit tension (N/mm)2) 115 147 182 220 240
Emulsion flow (L/min) 1900 3200 3700 4100 5300
According to the rolling parameters, the plate shape I value range of the rolled silicon steel is 3.0-6.1, and the thickness of the finished product is controlled between 0.3475 mm-0.3525 mm. The plate shape and thickness tolerance after annealing meet the standard and the use requirement of users.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A method for producing 0.35mm non-oriented silicon steel by using a cold continuous rolling mill comprises the following steps: smelting, continuous casting, hot rolling, cold rolling, continuous annealing and coating, and is characterized in that the thickness of a cold rolling raw material coil obtained after the hot rolling process is 1.8-2.0 mm;
the cold rolling process adopts a one-time rolling method, and the cold rolling raw material coil is rolled by a continuous five-pass rolling mill which has a five-rack six-roller CVC roll shifting function, and a rolling roll system consists of a working roll, a middle roll and a supporting roll; wherein the intermediate roller and the supporting roller are CVC (composite variable crown) shifting rollers, the shifting amount is +/-120 mm, the roller diameter of the working roller is 420-470 mm, and the surface roughness of the working roller is less than or equal to 1.0 mu m; the total reduction rate of the steel strip in the rolling process is 80.5-83.0%, wherein the first pass reduction rate is 28.3-32.3%, the second and third pass reduction rates are 31.5-41.9%, and the fourth pass reduction rate23.5 to 28.5 percent, the fifth pass reduction rate is 6.4 to 8.4 percent, the reduction rate from the second pass to the fifth pass is reduced gradually along with the pass, the rolling force from the first pass to the fourth pass is 10.21 to 12.61MN, the rolling force from the fifth pass is 7 to 8.3MN, and the entrance side unit tension range from the first pass to the fifth pass is 115 to 270N/mm2Coiling tension of 38N/mm2。
2. The method according to claim 1, wherein in the cold rolling process, emulsion spraying is adopted for process lubrication and cooling during rolling, the working rolls are cooled in a partition mode, the hot convexity of the working rolls is controlled so as to adjust the shape of the steel strip, and the shape I value is controlled to be 2.8-7.5.
3. The method according to claim 2, wherein the steel strip enters the constant rolling stage after the shape I value of the steel strip is controlled to be between 2.8 and 7.5, the rolling speed is a fixed value between 450 and 600m/min, and the thickness of the finished product ranges from 0.35mm +/-0.0025 mm.
4. The method according to claim 2 or 3, wherein the concentration of the emulsion is 0.5-5.0%, the temperature is 50-60 ℃, the flow rate of the emulsion in each pass is 1500-6000L/min, and the spraying is performed on one side.
5. Thin gauge 0.35mm non-oriented silicon steel produced by the method of any one of claims 1 to 4.
CN202010420065.7A 2020-05-18 2020-05-18 Method for producing 0.35mm non-oriented silicon steel by using cold continuous rolling mill Pending CN111687210A (en)

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
CN112474822A (en) * 2020-12-10 2021-03-12 安阳钢铁股份有限公司 Cold continuous rolling production process for medium carbon steel
CN112742868A (en) * 2020-12-10 2021-05-04 安阳钢铁股份有限公司 Cold rolling process for one time of cold continuous rolling of six-roller five-stand common oriented silicon steel
CN113198866A (en) * 2021-05-07 2021-08-03 新余钢铁股份有限公司 Thin-gauge middle-high-grade non-oriented silicon steel acid rolling production process
CN114160577A (en) * 2021-11-18 2022-03-11 山西太钢不锈钢股份有限公司 Cold rolling method for improving thickness precision of ultrathin high-grade non-oriented silicon steel
CN114210730A (en) * 2022-02-21 2022-03-22 山西太钢不锈钢精密带钢有限公司 Production method for improving rolling efficiency of stainless steel precision strip steel
CN114833195A (en) * 2022-03-28 2022-08-02 武汉钢铁有限公司 Cold rolling method for producing high-grade non-oriented silicon steel based on UCMW cold continuous rolling mill
CN118048574A (en) * 2024-04-16 2024-05-17 张家港扬子江冷轧板有限公司 Non-oriented silicon steel and production method thereof
CN118048574B (en) * 2024-04-16 2024-06-11 张家港扬子江冷轧板有限公司 Non-oriented silicon steel and production method thereof

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112474822A (en) * 2020-12-10 2021-03-12 安阳钢铁股份有限公司 Cold continuous rolling production process for medium carbon steel
CN112742868A (en) * 2020-12-10 2021-05-04 安阳钢铁股份有限公司 Cold rolling process for one time of cold continuous rolling of six-roller five-stand common oriented silicon steel
CN112474822B (en) * 2020-12-10 2023-06-02 安阳钢铁股份有限公司 Cold continuous rolling production process for medium carbon steel
CN113198866A (en) * 2021-05-07 2021-08-03 新余钢铁股份有限公司 Thin-gauge middle-high-grade non-oriented silicon steel acid rolling production process
CN113198866B (en) * 2021-05-07 2023-03-17 新余钢铁股份有限公司 Thin-gauge middle-high-grade non-oriented silicon steel acid rolling production process
CN114160577A (en) * 2021-11-18 2022-03-11 山西太钢不锈钢股份有限公司 Cold rolling method for improving thickness precision of ultrathin high-grade non-oriented silicon steel
CN114160577B (en) * 2021-11-18 2023-06-23 山西太钢不锈钢股份有限公司 Cold rolling method for improving thickness precision of ultrathin high-grade non-oriented silicon steel
CN114210730A (en) * 2022-02-21 2022-03-22 山西太钢不锈钢精密带钢有限公司 Production method for improving rolling efficiency of stainless steel precision strip steel
CN114210730B (en) * 2022-02-21 2022-04-26 山西太钢不锈钢精密带钢有限公司 Production method for improving rolling efficiency of stainless steel precision strip steel
CN114833195A (en) * 2022-03-28 2022-08-02 武汉钢铁有限公司 Cold rolling method for producing high-grade non-oriented silicon steel based on UCMW cold continuous rolling mill
CN118048574A (en) * 2024-04-16 2024-05-17 张家港扬子江冷轧板有限公司 Non-oriented silicon steel and production method thereof
CN118048574B (en) * 2024-04-16 2024-06-11 张家港扬子江冷轧板有限公司 Non-oriented silicon steel and production method thereof

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