CN107008758A - Cold-strip steel high accuracy plate shape surface roughness On-Line Control Method and system - Google Patents
Cold-strip steel high accuracy plate shape surface roughness On-Line Control Method and system Download PDFInfo
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- CN107008758A CN107008758A CN201710187209.7A CN201710187209A CN107008758A CN 107008758 A CN107008758 A CN 107008758A CN 201710187209 A CN201710187209 A CN 201710187209A CN 107008758 A CN107008758 A CN 107008758A
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- 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
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- 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
- B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The present invention relates to a kind of high-precision plate shape surface roughness On-Line Control Method of cold-strip steel and system, the deficiency of the current conventional method that belt steel surface roughness is monitored by sampling observation sampling, off-line analysis test, on-line tuning production technology used is overcome.The present invention proposes one kind on cold-strip steel continuous processing unit, pass through on-line checking belt steel surface roughness, skin pass rolling power is adjusted in real time according to the deviation between surface roughness detected value and desired value, while in order to keep strip mechanical performance and plate shape to be substantially unaffected, smooth tension force and smooth bending roller force are adjusted accordingly, realize the method that On-line Control is carried out to belt steel surface roughness, the control accuracy of Cold-strip Steel Surface roughness can be improved, the requirement of downstream user is preferably met.
Description
Technical field
The present invention relates to cold rolling of strip steel technical field, more particularly to a kind of high-precision plate shape surface of cold-strip steel is coarse
Spend online control model and control method and system.
Background technology
The downstream user of steel and iron industry is more and more stricter to the quality requirement of cold-rolled steel strip products, and surface roughness is for cold
Roll most important for plate, it is to influence the key factor of steel plate formability, is one of important indicator of cold-rolled products quality.
At present, in cold rolled strip steel production practice, be to the usual mode that belt steel surface roughness is monitored, it is related it is cold rolling after
Machine set outlet (such as Continuous Hot Dip Galvanizing or skin pass mill group) is handled, sampling observation sampling is carried out to strip, then in analysis test
Laboratory carries out off-line test to model and obtains the surface roughness parameter of strip, and is compared with the technical requirements of downstream user
Compared with.If belt steel surface roughness is unsatisfactory for the requirement of downstream user, in the production of subsequent production in the works to similar strip
Technological parameter carries out necessary adjustment, sampling, off-line analysis test, on-line tuning technological parameter etc. is then inspected by random samples again, until strip
Surface roughness fully meet downstream user requirement untill.This method has hysteresis quality and noncontinuity, and sampling point is general
In head and tail, it is impossible to represent the roughness feature of monoblock steel plate.
With the continuous progress of technology, non-contacting roughness measurement method has obtained rapid development, and this method is with light
Measuring method is the most universal, mainly including light cross-section method, optical interferometry, speckle method, scattering method etc..Measuring method has
Measuring speed is fast, not damaged, the advantages of real-time online measuring can be achieved, and rapid development has been obtained in nearest decades.Germany
The SORM 3plus systems of EMG Automation Co., Ltd exploitation, using the scattering principle of light, by the measurement to angle can not with
The surface roughness of cold-strip steel during measurement is moved in the case that strip is contacted.AMEPA companies are developed using light cross-section method principle
A kind of surface rough (SRM) is simultaneously applied, and obtain in the production line of many companies in the Europe such as Germany, Belgium
Significant effect.The existing 50 a plurality of unit (CGL, CAPL etc.) of foreign countries installs roughness on-line detector, and generation is partly realized
For offline sampling detection.Husky steel of domestic Shoudu Iron and Steel Co cold rolling mill and Jiangsu Zhangjiagang etc. has introduced the SRM systems of AMEPA companies
System, but non-contact type on-line measurement technology is not popularized yet at present, from now on still very big development space.
Siemens etc. is in exploitation formation process roughness Closed loop Control.The existing 10 a plurality of units' installations in the country are coarse
On-line detector is spent, but is currently only used for production process monitoring, not yet carries out the application technical researches such as roughness On-line Control.
The content of the invention
In order to solve the deficiency of offline inspection Cold-strip Steel Surface roughness, the roughness fluctuation of reduction belt steel surface, this hair
Bright purpose is to provide a kind of Cold-strip Steel Surface roughness On-Line Control Method, and the On-Line Control Method by examining online
The surface roughness of measuring tape steel, according to the deviation between surface roughness detected value and desired value to associated production technological parameter
(such as skin pass rolling power) is adjusted in real time, so that the on-line automatic closed-loop control to Cold-strip Steel Surface roughness is realized,
To improve the control accuracy of Cold-strip Steel Surface roughness, the requirement of downstream user is preferably met.
The technical scheme is that：A kind of high-precision plate shape surface roughness On-Line Control Method of cold-strip steel, it is described
On-Line Control Method comprises the following steps：
S1：Calculate belt steel surface roughness m measured value mactWith the desired value m of the belt steel surface roughnessrefBetween
Belt steel surface roughness deviation Δ m；
The belt steel surface roughness m is belt steel surface profile arithmetic average error RaOr 10 points of height of nao-and micro relief
RzOr peak density Pc。
S2：Determine belt steel flating roll-force regulated quantity：
The belt steel surface roughness deviation Δ m obtained according to step S1, determines belt steel flating roll-force regulated quantity Δ P,
To eliminate belt steel surface roughness deviation.
S3：Determine belt steel flating tension adjustment amount：
The skin pass rolling power regulated quantity Δ P obtained according to step S2, determines smooth entrance tension adjustment amount Δ T0Or it is flat
Whole outlet tension adjustment amount Δ T1, to keep smooth elongation percentage constant so that strip mechanical performance is substantially unaffected.
S4：Determine belt steel flating bending roller force regulated quantity：
The belt steel flating roll-force regulated quantity Δ P obtained according to step S2, determines smooth bending roller force regulated quantity Δ S, to protect
The whole rear belt plate shape that maintains an equal level is substantially unaffected.
S5：Determine whether belt steel rolling power regulated quantity exports：
By the absolute value of the belt steel surface roughness deviation obtained in step S1 | Δ m | with shown belt steel surface roughness
Corresponding closed-loop control threshold value Δ mlimMake comparisons, wherein Δ mlim＞ 0.
When | Δ m | >=Δ mlim, go to step S2 adjustment belt steel flating roll-forces；When | Δ m | ＜ Δs mlimWhen, without adjustment
Belt steel flating roll-force.
Further, the Δ P calculation formula of belt steel flating roll-force regulated quantity described in step S2 are as follows：
Δ P=Gainm_P×Δm/Km_P
In formula：Gainm_PFor skin pass rolling force control gain, 0 ＜ Gainm_P≤1.0；Km_PIt is skin pass rolling power to strip
Surface roughness affect coefficient, For differential operator.
Further, smooth entrance tension adjustment amount Δ T described in step S30Calculation formula is as follows：
In formula：For smooth entrance tension force gain, For smooth entrance
Power to skin pass rolling power carry-over factor,ε is smooth elongation percentage.
The smooth outlet tension adjustment amount Δ T1Computational methods are as follows：
In formula：Tension force gain is exported to be smooth, For smooth outlet
Power to skin pass rolling power carry-over factor,ε is smooth elongation percentage.
Further, smooth bending roller force regulated quantity Δ S=Gain described in step S4P_S×ΔP/KP_S
In formula：GainP_SFor smooth roller force control gain, 0 ＜ GainP_S≤1.0；KP_SIt is smooth bending roller force to smooth
Roll-force carry-over factor,C is strip profile.
The present invention also provides a kind of cold-strip steel high-precision plate shape surface roughness on-line control system, it is characterised in that
Including the planisher and surface roughness instruments being sequentially connected；The surface roughness instruments are used to detect that belt steel surface is thick
Rugosity m measured value mact；The planisher is used for according to the high-precision plate shape surface roughness On-line Control of above-mentioned cold-strip steel
Method controls Cold-strip Steel Surface roughness.
The beneficial effects of the present invention are：A kind of Cold-strip Steel Surface roughness On-Line Control Method is provided, it is described online
Control method can realize the line closed loop control to Cold-strip Steel Surface roughness, improve the control of Cold-strip Steel Surface roughness
Precision, improves product quality.
Brief description of the drawings
Fig. 1 is Cold-strip Steel Surface roughness On-line Control equipment schematic diagram of the present invention；
Fig. 2 is the curve map that skin pass rolling power of the present invention influences on belt steel surface profile arithmetic average error；
Fig. 3 is curve map of the skin pass rolling power of the present invention on the 10 points of height influences of belt steel surface nao-and micro relief；
Fig. 4 is Cold-strip Steel Surface roughness On-line Control flow chart of the present invention.
Fig. 5 is the curve map that skin pass rolling power of the present invention influences on belt steel surface peak density；
In Fig. 1,1, uncoiler, 2, strip, 3, continuous annealing furnace, 4, planisher, 5, surface roughness instruments, 6, batch
Machine.
Embodiment
Cold rolled strip steel production flow is：Pickling-cold rolling-annealing-smooth-coating, shearing and packaging.Wherein, flattening process
There is considerable influence to the surface roughness of cold-strip steel.
The surface roughness On-Line Control Method that the present invention is provided can be completed in equipment as shown in Figure 1.Such as Fig. 1 institutes
Show, the strip 2 for transmitting out by uncoiler 1 is after continuous annealing furnace 3 and planisher 4 are handled, by surface roughness
On-line computing model 5, the belt steel surface roughness m detected by the surface roughness on-line computing model 5 measured value is with
Desired value required by trip user is compared, if meeting downstream user requirement, strip 2 passes through surface roughness and existed
Line monitor 5, into coiling machine 6, i.e., into coating, shearing and packing stage；If not meeting downstream user requirement, then basis
The data of different surface roughness measured value, will adjust the related process parameters of planisher 4, until follow-up belt steel surface roughness
M meets downstream user requirement.
Wherein described surface roughness on-line detector 5 is connected in series with planisher 4, the surface roughness on-line checking
Instrument 5 is based on optical detection principle, is contactless, the medium position on strip width direction.
The smooth main purpose of cold-strip steel is to improve belt steel surface roughness, control plate shape and mechanical performance.Cold
During rolling belt steel flating, by imposing less plastic deformation (i.e. smooth elongation percentage to the strip after recrystallization annealing
ε, mostly between 0.2%~3%), the surface roughness of strip after annealing can be improved to a certain extent, eliminate and surrender flat
Platform.When smooth elongation percentage actual value deviates elongation percentage setting value, by adjusting skin pass rolling power or smooth entrance, outlet strip
Tension force, can make actual elongation percentage revert to setting value.It is smooth to prolong generally, for the harder strip of thinner thickness, material
Rate is stretched more sensitive to smooth warp tension ratio, generally using the smooth tensionless mode control elongation percentage of adjustment；For thickness is thicker, material compared with
Soft strip, smooth elongation percentage is more sensitive to skin pass rolling power, generally controls elongation percentage using adjustment skin pass rolling power mode.
The surface roughness on-line detector 5 is installed on machine set outlet section, after planisher 4.With to passing through
Belt steel surface roughness (including surface profile arithmetic average deviation, 10 points of nao-and micro relief height etc.) after smooth processing is entered
The function that row is detected in real time.As strip is continuously moved forward according to certain speed, it can in real time detect and obtain strip table
Surface roughness value (including surface profile arithmetic average deviation Ra, the point height of nao-and micro relief ten Rz, peak density PcDeng) and its edge
The situation of change in strip length direction.
It can be seen from cold-strip steel skin pass rolling is theoretical with production practices, as shown in Fig. 2, Fig. 3, Fig. 5, usually, with
Skin pass rolling power increases within the specific limits, and belt steel surface profile arithmetic average error, 10 points of height, peak values of nao-and micro relief are close
The corresponding increase of degree, vice versa.
The strategy for automatically controlling belt steel surface roughness in the present invention by adjusting flattening technological parameter refers to, when surface is thick
The belt steel surface roughness measured value m that rugosity detector 5 is detectedactLess than the belt steel surface roughness desired value m of settingrefIt is super
When crossing to a certain degree, it may be preferable that by increasing skin pass rolling power, until belt steel surface roughness measured value mactClose to surface
Roughness desired value mrefUntill；The belt steel surface roughness measured value m detected when surface roughness instruments 5actHigher than setting
Fixed belt steel surface roughness desired value mrefMore than to a certain degree when, it may be preferable that by reducing skin pass rolling power, until strip
Surface roughness measured value mactClose to surface roughness desired value mrefUntill.
With reference to Fig. 4, illustrate the on-line automatic control of belt steel surface roughness realizes step and implementation method.Step
It is rapid as follows：
(1) determination of belt steel surface roughness deviation
Surface roughness instruments 5 detect obtained belt steel surface roughness measured value mactSubtract the rough surface of setting
Spend desired value mref, obtain belt steel surface roughness deviation：
Δ m=mact-mref
In formula：Δ m is belt steel surface roughness deviation；mrefFor the belt steel surface roughness desired value of setting, from machine
Group process control computer, the requirement according to downstream user to product is determined.The belt steel surface roughness m is belt steel surface wheel
Wide arithmetic average deviation RaOr the point height of nao-and micro relief ten RzOr peak density Pc。
(2) skin pass rolling power regulated quantity is determined
Preferentially, calculated according to surface roughness deviation and determine skin pass rolling power regulated quantity, by playing skin pass rolling
Power reaches to the adjustment effect of surface roughness and smoothly eliminates belt steel surface roughness deviation in time, realizes high-precision surface
The purpose of roughness closed-loop control.
The belt steel surface roughness deviation Δ m determined according to step (1), calculates and determines skin pass rolling power regulated quantity Δ P：
Δ P=Gainm_P×Δm/Km_P
In formula：Δ P is skin pass rolling power regulated quantity；Gainm_PFor skin pass rolling force control gain, 0 ＜ Gainm_P≤1.0；
Km_PCoefficient is influenceed on belt steel surface roughness for skin pass rolling power,It is strip material, specification and flat
The function of whole technological parameter etc., can be calculated by theoretical model and obtain or test to obtain.
(3) smooth tension adjustment amount is determined
Due to regulation skin pass rolling power, smooth elongation percentage can be caused to change, in turn result in the fluctuation of strip mechanical performance.In order to
Keep smooth elongation percentage constant so that strip mechanical performance is substantially unaffected, it is smooth to calculate determination according to rolling force deviation value
Entrance tension adjustment amount or smooth outlet tension adjustment amount, by playing adjustment effect of the tension force to smooth elongation percentage, reach
While smoothly eliminating belt steel surface roughness deviation in time, realize the purpose of high-precision surface roughness closed-loop control, protect
Demonstrate,prove strip mechanical performance constant.
The skin pass rolling power regulated quantity determined according to step (2), calculates and determines smooth entrance tension adjustment amount Δ T0Or
Smooth outlet tension adjustment amount Δ T1：
In formula：For smooth entrance tension force gain, For smooth entrance
Power to skin pass rolling power carry-over factor,ε is smooth elongation percentage.
The smooth outlet tension adjustment amount Δ T1Computational methods are as follows：
In formula：Tension force gain is exported to be smooth, For smooth outlet
Power to skin pass rolling power carry-over factor,ε is smooth elongation percentage.
(4) belt steel flating bending roller force regulated quantity is determined
Due to regulation skin pass rolling power, smooth outlet belt plate shape can be caused to fluctuate.In order to keep smooth outlet band steel plate
Shape is basically unchanged, and is calculated according to rolling force deviation value and is determined smooth bending roller force regulated quantity, by playing bending roller force to smooth outlet
The adjustment effect of belt plate shape, reaches and smoothly eliminates belt steel surface roughness deviation in time, realizes high-precision surface roughness
While the purpose of closed-loop control, it is ensured that smooth outlet belt plate shape is substantially unaffected.The leveling rolling determined according to step (2)
Power regulated quantity Δ p processed, calculates smooth bending roller force regulated quantity Δ S：
Δ S=GainP_S×ΔP/KP_S
In formula：GainP_SFor smooth roller force control gain, 0 ＜ GainP_S≤1.0；KP_SIt is smooth bending roller force to smooth
Roll-force carry-over factor,C is strip profile.
(5) determine whether belt steel flating tension adjustment amount or skin pass rolling power regulated quantity export, step is as follows：
By the absolute value of the belt steel surface roughness deviation obtained in step (1) | Δ m | it is coarse with shown belt steel surface
Spend corresponding closed-loop control threshold value Δ mlimMake comparisons, wherein Δ mlim＞ 0.
When | Δ m | >=Δ mlim, step (2) adjustment belt steel flating roll-force, tension force and bending roller force are gone to, and be output to flat
The corresponding executing agency of complete machine；When | Δ m | ＜ Δs mlimWhen, without adjusting belt steel flating roll-force, tension force and bending roller force.
The method that the present invention passes through above-mentioned On-line Control, it is possible to achieve the line closed loop control of Cold-strip Steel Surface roughness
System, improves the control accuracy of Cold-strip Steel Surface roughness, improves product quality.
Claims (6)
1. the high-precision plate shape surface roughness On-Line Control Method of a kind of cold-strip steel, it is characterised in that comprise the following steps：
S1:Calculate belt steel surface roughness m measured value mactWith the desired value m of belt steel surface roughnessrefBetween strip table
Surface roughness deviation △ m；
S2：Determine belt steel flating roll-force regulated quantity：
The belt steel surface roughness deviation △ m obtained according to step S1, determine belt steel flating roll-force regulated quantity △ P；
S3：Determine belt steel flating tension adjustment amount：
The belt steel flating roll-force regulated quantity △ P obtained according to step S2, determine smooth entrance tension adjustment amount △ T0Or it is flat
Whole outlet tension adjustment amount △ T1；
S4：Determine belt steel flating bending roller force regulated quantity：
The belt steel flating roll-force regulated quantity △ P obtained according to step S2, determine smooth bending roller force regulated quantity △ S；S5：It is determined that band
Whether steel rolling power regulated quantity exports：
By the absolute value of the belt steel surface roughness deviation obtained in step S1 | △ m | it is corresponding with belt steel surface roughness to close
Ring control threshold value △ mlimMake comparisons, wherein △ mlim>0；
When | △ m | >=△ mlim, go to step S2 adjustment belt steel flating roll-forces；When | △ m |<△mlimWhen, without adjusting strip
Skin pass rolling power.
2. a kind of Cold-strip Steel Surface roughness On-Line Control Method according to claim 1, it is characterised in that the band
Steel surface roughness m is belt steel surface profile arithmetic average error RaOr the point height of nao-and micro relief ten RzOr peak density Pc。
3. a kind of Cold-strip Steel Surface roughness On-Line Control Method according to claim 1, it is characterised in that step S2
In, the belt steel flating roll-force regulated quantity △ P computational methods are as follows：
△ P=Gainm_P×△m/Km_P
In formula：Gainm_PFor skin pass rolling force control gain, 0<Gainm_P≤1.0；Km_PIt is thick to belt steel surface for skin pass rolling power
Rugosity influences coefficient, For differential operator.
4. a kind of Cold-strip Steel Surface roughness On-Line Control Method according to claim 1, it is characterised in that step S3
In, the smooth entrance tension adjustment amount △ T0Computational methods are as follows：
In formula：For smooth entrance tension force gain,Skin pass rolling power is transmitted for smooth entrance tension force and is
Number,ε is smooth elongation percentage.
The smooth outlet tension adjustment amount △ T1Computational methods are as follows：
In formula：Tension force gain is exported to be smooth, It is smooth outlet tension force to flat
Whole roll-force carry-over factor,ε is smooth elongation percentage.
5. a kind of Cold-strip Steel Surface roughness On-Line Control Method according to claim 1, it is characterised in that step S4
In, the smooth bending roller force regulated quantity △ S computational methods are as follows：
△ S=GainP_S×△P/KP_S
In formula：GainP_SFor smooth roller force control gain, 0<GainP_S≤1.0；KP_SIt is smooth bending roller force to skin pass rolling power
Carry-over factor,C is strip profile.
6. the high-precision plate shape surface roughness on-line control system of a kind of cold-strip steel, it is characterised in that including what is be sequentially connected
Planisher and surface roughness instruments；The surface roughness instruments are used for the measured value for detecting belt steel surface roughness m
mact；The high-precision plate shape surface roughness of cold-strip steel that the planisher is used for according to claim any one of 1-5 is online
Control method controls Cold-strip Steel Surface roughness.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109821903A (en) * | 2019-02-20 | 2019-05-31 | 攀钢集团攀枝花钢铁研究院有限公司 | The control method of high-strength steel hot rolled plate shape |
| CN110732558A (en) * | 2019-10-29 | 2020-01-31 | 燕山大学 | Online three-dimensional monitoring method for cold-rolled strip shape |
| CN113838055A (en) * | 2021-11-29 | 2021-12-24 | 惠民万顺节能新材料有限公司 | System and method for detecting surface roughness uniformity of cold-rolled plate |
| CN113927487A (en) * | 2020-06-29 | 2022-01-14 | 宝山钢铁股份有限公司 | Online control method for surface roughness of cold-rolled strip steel |
| CN114101341A (en) * | 2021-11-16 | 2022-03-01 | 鞍钢联众(广州)不锈钢有限公司 | Method for eliminating ferrite stainless steel cold rolling yield platform |
| CN114952438A (en) * | 2022-05-30 | 2022-08-30 | 首钢京唐钢铁联合有限责任公司 | Finishing manufacturing method and device for cold-rolled strip steel |
| WO2024013366A1 (en) | 2022-07-14 | 2024-01-18 | Tata Steel Ijmuiden B.V. | Method for producing cold rolled steel strip |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109821903A (en) * | 2019-02-20 | 2019-05-31 | 攀钢集团攀枝花钢铁研究院有限公司 | The control method of high-strength steel hot rolled plate shape |
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| CN113927487A (en) * | 2020-06-29 | 2022-01-14 | 宝山钢铁股份有限公司 | Online control method for surface roughness of cold-rolled strip steel |
| CN114101341A (en) * | 2021-11-16 | 2022-03-01 | 鞍钢联众(广州)不锈钢有限公司 | Method for eliminating ferrite stainless steel cold rolling yield platform |
| CN114101341B (en) * | 2021-11-16 | 2024-03-19 | 鞍钢联众(广州)不锈钢有限公司 | Method for eliminating ferrite stainless steel cold rolling yield platform |
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| CN113838055B (en) * | 2021-11-29 | 2022-02-22 | 惠民万顺节能新材料有限公司 | System and method for detecting surface roughness uniformity of cold-rolled plate |
| CN114952438A (en) * | 2022-05-30 | 2022-08-30 | 首钢京唐钢铁联合有限责任公司 | Finishing manufacturing method and device for cold-rolled strip steel |
| WO2024013366A1 (en) | 2022-07-14 | 2024-01-18 | Tata Steel Ijmuiden B.V. | Method for producing cold rolled steel strip |
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