CN111036676A - Production method of thin strip steel of cold continuous rolling mill - Google Patents

Production method of thin strip steel of cold continuous rolling mill Download PDF

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Publication number
CN111036676A
CN111036676A CN201911391844.2A CN201911391844A CN111036676A CN 111036676 A CN111036676 A CN 111036676A CN 201911391844 A CN201911391844 A CN 201911391844A CN 111036676 A CN111036676 A CN 111036676A
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China
Prior art keywords
frames
cold continuous
continuous rolling
strip steel
rolling mill
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201911391844.2A
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Chinese (zh)
Inventor
张宝森
李琳波
王巍
王耀东
李刚
姬更岐
高磊
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Tianjin Angang Tiantie Cold Rolled Sheet Co ltd
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Tianjin Angang Tiantie Cold Rolled Sheet Co ltd
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Priority to CN201911391844.2A priority Critical patent/CN111036676A/en
Publication of CN111036676A publication Critical patent/CN111036676A/en
Withdrawn legal-status Critical Current

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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
    • 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
    • B21B2265/00—Forming parameters
    • B21B2265/02—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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

The invention relates to a method for producing thin strip steel for a cold continuous rolling mill, which is applied to a cold continuous rolling mill group and comprises the following steps: the load distribution of 5 frames of the cold continuous rolling unit is as follows: the first 4 frames finish 85-89.5% of total relative reduction, and the No. 5 frame finishes 3-5% of relative reduction; the unit tension among 5 frames is taken as 0.3-0.4 time of the yield strength of the strip steel; the concentration of the emulsion is 3.3-3.5%, the ESI is controlled to be 0.1-0.3, and the temperature is controlled to be 50-52 ℃; working rolls with the diameters of 420-430mm are selected for rolling in 5 stands, the working rolls of the first 4 stands are smooth rolls, the roughness of the working rolls of the first 4 stands is adjusted to be 0.8, and the working rolls of the No. 5 stand are rough rolls. The invention can realize the characteristics of good strip shape, excellent surface quality, high production efficiency, high thickness precision and the like of the rolled strip steel, and can also save the cost of raw materials.

Description

Production method of thin strip steel of cold continuous rolling mill
Technical Field
The invention belongs to the technical field of cold continuous rolling, and particularly relates to a production method of thin strip steel of a cold continuous rolling mill.
Background
The existing thin strip steel rolling with large cold rolling reduction (generally, the total reduction is more than 85%) is mostly produced by adopting a mode of evenly distributing 5 stands, but the following problems often occur when the thin strip steel is produced by adopting the mode:
1. the rolling load fluctuation causes the defect of poor plate shape after rolling, and the primary qualification rate of the acid rolling product is influenced;
2. because the working roll of the last stand adopts the smooth roll, the surface quality and the subsequent processing performance after rolling have no good effect of the rough roll;
3. when thick specification products are produced, the machine needs to be stopped to switch rolling modes, and the production efficiency is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a production method of a thin strip of a cold continuous rolling mill, and the thin strip produced by the production method has the advantages of stable operation, minimum thickness deviation, flat and straight shape and good surface quality.
The invention is realized by a method for producing thin strip steel for a cold continuous rolling mill, which is applied to a cold continuous rolling mill train, and comprises the following steps:
the load distribution of 5 frames of the cold continuous rolling unit is as follows: the first 4 frames finish 85-89.5% of total relative reduction, and the No. 5 frame finishes 3-5% of relative reduction;
adjusting tension matching among the frames, wherein the unit tension among the 5 frames is taken as a value of 0.3-0.4 time of the yield strength of the strip steel;
adjusting emulsion concentration, ESI and temperature parameters, wherein the emulsion concentration is 3.3-3.5%, the ESI is controlled to be 0.1-0.3, and the temperature is controlled to be 50-52 ℃;
working rolls with the diameters of 420-430mm are selected for rolling in 5 stands, the working rolls of the first 4 stands are smooth rolls, the roughness of the working rolls of the first 4 stands is adjusted to be 0.8, and the working rolls of the No. 5 stand are rough rolls.
In the above technical solution, preferably, the rolling mode of the 5# stand is a constant rolling force mode.
In the above technical solution, preferably, the relative reduction amount completed by the 1# frame is 43 to 47%, the relative reduction amount completed by the 2# frame is 42 to 45%, the relative reduction amount completed by the 3# frame is 35 to 38%, and the relative reduction amount completed by the 4# frame is 35 to 43%.
Compared with the prior art, the invention has the advantages and positive effects that:
the invention adopts the first 4 frames to complete most of pressing tasks, and the No. 5 frame adopts the hair roller and is used as a production method for producing the thin strip steel in a constant rolling force mode, so that the characteristics of good strip shape, excellent surface quality, high production efficiency, high thickness precision and the like of the rolled strip steel can be realized, the cost of raw materials can be saved, the application range of the raw materials with the same specification is improved, and the market competitiveness and the market adaptability are extremely strong.
Drawings
FIG. 1 is a schematic illustration of 5 stand rolling in the production of thin strip steel provided by an embodiment of the present invention;
fig. 2 is a stress-strain curve for each steel grade provided by an example of the present invention.
In the figure: 1. working roll of No. 1 frame; 2. working roll of No. 2 frame; 3. working roll of No. 3 frame; 4. working rolls of the No. 4 frame; 5. working roll of No. 5 frame.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
in the following, the rolling scale Q195L, the 3.0mm 917mm gauge rolled to 0.305mm, and the total compression ratio 90% are taken as examples, and PL is acid pickling, TCM is continuous rolling mill, BR is tension roll, and St-Ro is deviation correcting system in FIG. 1.
Examples
Referring to fig. 1, an embodiment of the present invention provides a method of producing a thin strip for a cold continuous rolling mill, which is applied to a cold continuous rolling mill train (i.e., a five-stand continuous rolling mill), the method including:
the load distribution of 5 frames of the cold continuous rolling unit is as follows: the first 4 frames finish 89.4 percent of relative reduction, and the No. 5 frame finishes 3.7 percent of relative reduction; the first 4 stands finish most of rolling reduction, the rolling reduction mode is a relative rolling reduction mode, the No. 5 stand is used for correcting the flatness of the strip steel, and the rolling reduction mode is a constant rolling force mode, so that the flatness precision of the strip steel is further ensured. The relative pressing amounts of the No. 1-5 frames in the embodiment are 46.983%, 44.847%, 37.701%, 42.045% and 3.7% in sequence.
Adjusting tension matching among the frames, obtaining unit tension among 5 frames according to 0.3-0.4 times of yield strength of strip steel, referring to fig. 2 for a stress-strain curve of a specific steel type, taking an SPCC steel type as an example in the embodiment, and respectively enabling the unit tension among the frames (sequentially comprising inlet tension of a No. 1 frame, four tensions among the No. 1-5 frames and outlet tension of the No. 5 frame) to be 55N/mm2、110N/mm2、120N/mm2、130N/mm2、140N/mm2、38N/mm2In the process of low-speed operation of the rolling mill, the rolling mill has large load and high rolling force, and corresponding additional tension is applied to reduce the load of the rolling mill and ensure that strip steel between frames is not broken by rolling. During the speed-up of the rolling mill, the additional tension is gradually reduced.
Adjusting the concentration, ESI and temperature parameters of the emulsion to ensure roll gap lubrication and cooling under the condition of large compression ratio, wherein the concentration of the emulsion is 3.3-3.5%, the ESI is controlled to be 0.1-0.3, and the temperature is controlled to be 50-52 ℃. Through a large number of attempts, the concentration adopts the concentration range of 3.3-3.5%, so that rolling lubrication can be ensured, and rolling slip caused by high concentration is avoided; ESI is controlled to be 0.1-0.3, the characteristic of rapid oil-water separation of emulsion is fully utilized, lubrication is guaranteed, and meanwhile, the cooling performance of the roller is improved; the temperature is controlled to be 50-52 ℃, so that the cooling performance of the emulsion can be effectively improved.
Working rolls with the diameter of 420-430mm are selected for the 5 frames for rolling, and the small-roll-diameter roll has the advantages of reducing the contact area, reducing the rolling force, reducing the elastic deformation and being beneficial to rolling thin strips. The working rolls of the first 4 frames are smooth rolls, the working roll of the No. 5 frame is a rough roll, the roughness of the rough roll in the embodiment is 3.5, the roughness of the working rolls of the first 4 frames is adjusted to be 0.8, and the steel passing amount of the roll is improved while the rolling stability is ensured. The roughness of the working rolls of the first 4 frames is improved to 0.8 from 0.65, the rolling mill generates vibration when the working rolls with the roughness of 0.65 are used for rolling to 300 kilometers, the measured roughness after off-line is reduced by 0.12-0.18um, the roughness is improved to 0.8, the rolling mill does not generate vibration when the rolling kilometer number is improved to 400 kilometers, the measured roughness after off-line is reduced by 0.21-0.24um, and the rolling mill can keep the rolling speed of 1100-one-year 1200 m/s.
The invention adopts the first 4 frames to complete most of pressing tasks, and the No. 5 frame adopts the hair roller and adopts the production method of producing the thin strip steel in the constant rolling force mode, thereby realizing the characteristics of good strip shape, good surface quality, high production efficiency, high thickness precision and the like of the rolled strip steel, saving the cost of raw materials, improving the application range of the raw materials with the same specification, and having strong market competitiveness and market adaptability.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (3)

1. A method for producing thin strip for cold continuous rolling mill, applied to a cold continuous rolling train, characterized in that it comprises:
the load distribution of 5 frames of the cold continuous rolling unit is as follows: the first 4 frames finish 85-89.5% of total relative reduction, and the No. 5 frame finishes 3-5% of relative reduction;
adjusting tension matching among the frames, wherein the unit tension among the 5 frames is taken as a value of 0.3-0.4 time of the yield strength of the strip steel;
adjusting emulsion concentration, ESI and temperature parameters, wherein the emulsion concentration is 3.3-3.5%, the ESI is controlled to be 0.1-0.3, and the temperature is controlled to be 50-52 ℃;
working rolls with the diameters of 420-430mm are selected for rolling in 5 stands, the working rolls of the first 4 stands are smooth rolls, the roughness of the working rolls of the first 4 stands is adjusted to be 0.8, and the working rolls of the No. 5 stand are rough rolls.
2. The method for producing thin strip steel for cold continuous rolling mill according to claim 1, wherein the reduction mode of the # 5 stand is a constant rolling force mode.
3. The method of producing thin strip steel for cold continuous rolling mill according to claim 1, wherein the relative reduction at 1# stand is 43 to 47%, the relative reduction at 2# stand is 42 to 45%, the relative reduction at 3# stand is 35 to 38%, and the relative reduction at 4# stand is 35 to 43%.
CN201911391844.2A 2019-12-30 2019-12-30 Production method of thin strip steel of cold continuous rolling mill Withdrawn CN111036676A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113500098A (en) * 2021-08-20 2021-10-15 山西太钢不锈钢股份有限公司 Method for eliminating rolling chromatic aberration of ultrapure ferrite stainless steel by five-rack six-roller continuous rolling mill
CN113664037A (en) * 2021-07-23 2021-11-19 山东钢铁集团日照有限公司 Production method of cold-rolled IF steel with high surface cleanliness
CN114345932A (en) * 2021-12-13 2022-04-15 首钢京唐钢铁联合有限责任公司 Strip steel rolling control method, device, medium and computer equipment

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11138203A (en) * 1997-11-06 1999-05-25 Ishikawajima Harima Heavy Ind Co Ltd Continuous rolling method and continuous rolling equipment for executing this method
CN1640572A (en) * 2004-01-16 2005-07-20 宝山钢铁股份有限公司 Comprehensive optimized control method of rolling stardard for cold band-steel continuous rolling mill
CN101934290A (en) * 2009-06-30 2011-01-05 上海宝信软件股份有限公司 Load allocation adjusting method for stainless steel tandem cold rolling mill
CN103357670A (en) * 2012-03-27 2013-10-23 上海梅山钢铁股份有限公司 Reduction schedule optimizing method applicable to five-stand UCM (universal crown mill) type cold continuous rolling unit
CN103861873A (en) * 2014-02-28 2014-06-18 北京首钢股份有限公司 Texturing roll rolling system and method of UCMW tandem cold rolling mill
CN104148385A (en) * 2014-07-28 2014-11-19 北京首钢股份有限公司 Non-oriented electrical steel surface black line eliminating method
CN104785538A (en) * 2014-01-21 2015-07-22 宝山钢铁股份有限公司 Reduction schedule optimization method for rolling ultrathin strip steel by cold continuous rolling set

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11138203A (en) * 1997-11-06 1999-05-25 Ishikawajima Harima Heavy Ind Co Ltd Continuous rolling method and continuous rolling equipment for executing this method
CN1640572A (en) * 2004-01-16 2005-07-20 宝山钢铁股份有限公司 Comprehensive optimized control method of rolling stardard for cold band-steel continuous rolling mill
CN101934290A (en) * 2009-06-30 2011-01-05 上海宝信软件股份有限公司 Load allocation adjusting method for stainless steel tandem cold rolling mill
CN103357670A (en) * 2012-03-27 2013-10-23 上海梅山钢铁股份有限公司 Reduction schedule optimizing method applicable to five-stand UCM (universal crown mill) type cold continuous rolling unit
CN104785538A (en) * 2014-01-21 2015-07-22 宝山钢铁股份有限公司 Reduction schedule optimization method for rolling ultrathin strip steel by cold continuous rolling set
CN103861873A (en) * 2014-02-28 2014-06-18 北京首钢股份有限公司 Texturing roll rolling system and method of UCMW tandem cold rolling mill
CN104148385A (en) * 2014-07-28 2014-11-19 北京首钢股份有限公司 Non-oriented electrical steel surface black line eliminating method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113664037A (en) * 2021-07-23 2021-11-19 山东钢铁集团日照有限公司 Production method of cold-rolled IF steel with high surface cleanliness
CN113500098A (en) * 2021-08-20 2021-10-15 山西太钢不锈钢股份有限公司 Method for eliminating rolling chromatic aberration of ultrapure ferrite stainless steel by five-rack six-roller continuous rolling mill
CN114345932A (en) * 2021-12-13 2022-04-15 首钢京唐钢铁联合有限责任公司 Strip steel rolling control method, device, medium and computer equipment

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Application publication date: 20200421