CN107686958A - A kind of accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness - Google Patents
A kind of accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness Download PDFInfo
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- CN107686958A CN107686958A CN201710914419.1A CN201710914419A CN107686958A CN 107686958 A CN107686958 A CN 107686958A CN 201710914419 A CN201710914419 A CN 201710914419A CN 107686958 A CN107686958 A CN 107686958A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating With Molten Metal (AREA)
Abstract
The present invention is applied to zinc-plated automobile steel manufacturing technology field, there is provided a kind of accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness, this method comprise the following steps：Annealing, be zinc-plated during zincincation, steel plate thickness variation delta T caused by three processes of finishing are calculated, the steel plate thickness variable quantity corresponds to steel plate thickness correction value；The hard belt steel thickness value for rolling out mouth, as steel band original depth value are rolled to calculate based on steel plate thickness correction value and galvanized steel plain sheet target thickness value；Rolling for calculating of the embodiment of the present invention rolls out a mouthful belt steel thickness value firmly, consider subsequent anneal, the influence that zinc-plated and finishing process is to steel plate thickness, galvanized steel plain sheet target thickness can be controlled in the thickness deviation requirement of high-end Automobile Plate challenging needs, meet the needs of market very well.
Description
Technical field
The invention belongs to zinc-plated automobile steel manufacturing technology field, there is provided a kind of continuous hot-dipping galvanizing steel plate finished product thickness
Accurate control method.
Background technology
With the rapid development of national economy particularly auto industry, hot dip galvanizing automobile plate because its have excellent punching press and
Decay resistance is favored by user, the continuous galvanizing line of Ma Gang new districts 2030 from 2007 go into operation since, zinc-plated Automobile Plate
Yield increases year by year, and product quality is lifted steadily, the complex manufacturing of zinc-plated Automobile Plate, and technical merit requires high, still, removes
Basic mechanical property and surface quality need to meet beyond the needs of user, and the dimensional accuracy of Automobile Plate is also superior automobile
The highly important technical indicator of panel, after automobile plate stamping and forming, general thickness will change.The thinning rate mistake of thickness
Senior general directly affects intensity and the use of stamping parts.And if the thickness and precision deviation of Automobile Plate easily influences diel when excessive
It is excessive and cause excessive material to subtract so as to easily cause the compression of stamping process and tension with the die clearance of stamping parts
It is thin, local buckling and produce the quality problems such as drawing crack or corrugation, made a big impact to die life and stamping parts qualification rate.It is logical
Normal automobile factory requires control within ± 3% the thickness deviation of product.For zinc-plated car panel dimension precision requirement more
It is high, it is desirable to as close possible to the thickness of customer specification.
By carrying out statistics discovery to the Reducing thickness ratio of existing galvanized steel plain sheet finished product thickness, more than the plating of 0.8mm thickness
The thickness Reducing thickness of zinc steel sheet product exceedes the 3% of product thickness specification, reaches as high as 4%.With the water in kind of current product
It is flat, it there is no method to meet strict demand of the superior automobile production firm to raw material dimensional accuracy, so improving galvanized steel plain sheet automobile
The problem of finished product thickness precision controlling level of plate is in the urgent need to address.
The content of the invention
The embodiment of the present invention provides a kind of accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness, it is intended to solves existing
The thickness Reducing thickness of some galvanized steel plain sheet products exceedes the 3% of product thickness specification, and automobile production manufacturer can not be met to original
The strict demand problem of scantling precision.
The present invention is achieved in that a kind of accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness, the side
Method comprises the following steps：
S1, calculate zincincation during anneal, be zinc-plated, steel plate thickness variation delta T caused by three processes of finishing,
The steel plate thickness variable quantity corresponds to steel plate thickness correction value；
S2, the hard belt steel thickness for rolling out mouth rolled to calculate based on steel plate thickness correction value and galvanized steel plain sheet target thickness value
Value, as steel band original depth value；
Further, value, Zinc Coating Thickness value added and finishing thickness is thinned by anneal gauge in the steel plate thickness correction value
Value composition is thinned.
Further, the strip original depth value=strip target thickness value+anneal gauge is thinned value-Zinc Coating Thickness and increased
Value is thinned in value added+finishing thickness.
Further, the calculating of the thinned value of anneal gauge specifically comprises the following steps：
S11, the outlet stripped deviation value based on statistics go out different original depths from the Relation acquisition of steel band original depth value
Strip in the Reducing thickness of annealing operation and the relation of strip original depth, wherein, outlet stripped deviation value=finishing thickness subtracts
Thin value-galvanized layer thickness value；
S12, relation of the different original depth strips in the Reducing thickness and strip original depth of annealing operation is returned
Analysis, draw the equation of linear regression of anneal gauge Reducing thickness and strip original depth, the expression formula of the equation of linear regression
It is specific as follows：
Value=(1.2+10.5 × steel band original depth value)/1000 (unit is thinned in anneal gauge：mm)
Further, the Zinc Coating Thickness value added is that the zinc layer weight specified based on client is calculated, the meter
It is specific as follows to calculate formula：
Zinc Coating Thickness value added=[(nominal zinc layer weight+10)/50] * 0.0071 (unit：mm)
Wherein, from knowhow：Zinc layer weight often increases 50g, and about 7.1 μm of zinc thickness increase, 10 be that equipment is set
It is worth the compensation of deviation.
Further, the calculation formula of value is thinned in the finishing thickness：
Value=SPM × galvanized steel plain sheet target thickness value is thinned in finishing thickness
Wherein, SPM is strip elongation percentage, i.e., the length increment divided by 100 of every 100 meters of strip extension.
Further, it is described roll the hard belt steel thickness value for rolling out mouth calculation formula it is specific as follows：
Wherein T0To roll the hard belt steel thickness value for rolling out mouth, TfFor steel band target thickness value.
Rolling for calculating of the embodiment of the present invention rolls out a mouthful belt steel thickness value firmly, considers subsequent anneal, zinc-plated and finishing work
The influence of ordered pair steel plate thickness, galvanized steel plain sheet target thickness can be controlled to the thickness deviation requirement in high-end Automobile Plate challenging needs
It is interior, meet the needs of market very well；In addition, data maintenance is simple, there is no too high requirement for production technology, operation possesses can
Row, significant effect, the thickness control model that the present invention designs is accurate to the thickness control of galvanized steel plain sheet finished product, efficiency high, from
Dynamicization degree is high, is adapted to marketing, has a good application prospect.
Brief description of the drawings
Fig. 1 is the flow of the accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness provided in an embodiment of the present invention
Figure；
Fig. 2 is to roll the hard belt steel thickness value for rolling out mouth, annealed, zinc-plated and finishing based on method provided by the invention control
Galvanized steel plain sheet thickness value afterwards.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Finished steel sheet needs to roll by steel-making-hot rolling-acid-zinc-plated four technique, wherein, include successively in zinc-plated process：
Annealing, zinc-plated (steel band after annealing is immersed in zinc pot, and zinc liquid can be attached to steel strip surface so as to obtain zinc coat),
Three processes of finishing, these three processes are more notable to the thickness effect of galvanized steel plain sheet.
Fig. 1 is the flow of the accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness provided in an embodiment of the present invention
Figure, this method comprise the following steps：
S1, calculate zincincation during anneal, be zinc-plated, steel plate thickness variation delta T caused by three processes of finishing,
The steel plate thickness variable quantity corresponds to steel plate thickness correction value；
In embodiments of the present invention, if steel plate thickness variation delta T is on the occasion of that is, annealed, zinc-plated, three processes of finishing
Steel plate thickness increase, steel plate thickness correction value is-Δ T (negative value), if steel plate thickness variation delta T is negative value, i.e., annealed, plating
Three zinc, finishing process steel plate thickness are thinned, and steel plate thickness correction value is-Δ T (on the occasion of)；
The thickness correction values are made up of three parts, i.e., thickness is thinned as caused by annealing operation, and referred to as anneal gauge is thinned
Value, the thickness increase as caused by zinc-plated process, referred to as Zinc Coating Thickness value added, the thickness as caused by finishing process are thinned, and are referred to as
Value is thinned in finishing thickness；
In embodiments of the present invention, the calculating of the thinned value of anneal gauge specifically comprises the following steps：
S11, the outlet stripped deviation value based on statistics go out different original depths from the Relation acquisition of steel band original depth value
Strip in the Reducing thickness of annealing operation and the relation of strip original depth, wherein, outlet stripped deviation value=strip is initially thick
Value+zinc coating thickness value is thinned in angle value-finishing thickness；
In embodiments of the present invention, stripped deviation value=strip original depth value-(strip original depth value-finishing is exported
Value+zinc coating thickness value is thinned in thickness) the thinned value-galvanized layer thickness value of=finishing thickness.
S12, the strip to different original depths return in the Reducing thickness of annealing operation and the relation of strip original depth
Return analysis, draw the equation of linear regression of anneal gauge Reducing thickness and strip original depth, the expression formula of the equation is specific as follows：
Anneal gauge, which is thinned value ,=(1.2+10.5 × rolls the hard belt steel thickness value for rolling out mouth)/1000 (unit：mm)
In embodiments of the present invention, the Zinc Coating Thickness value added is that the zinc layer weight specified based on client is calculated,
Calculation formula is specific as follows：
Zinc Coating Thickness value added=[(nominal zinc layer weight+10)/50] * 0.0071 (unit：mm)
Wherein, from knowhow：Zinc layer weight often increases 50g, and about 7.1 μm of zinc thickness increase, 10 be that equipment is set
It is worth the compensation of deviation, the actual setpoint of production line is set according to order zinc coating thickness, but practice examining result one side zinc
Layer can be more relatively low 10g/m than setting value2, therefore to ensure that zinc coating thickness can meet user's request, spy adds equipment setting value herein
The offset of deviation.
In embodiments of the present invention, the calculation formula of value is thinned in the finishing thickness：
Value=SPM × galvanized steel plain sheet target thickness value is thinned in finishing thickness
Wherein, SPM is strip elongation percentage, i.e., the length increment divided by 100 of every 100 meters of strip extension, unit is %, this
When steel plate thickness value be steel plate thickness value after zinc-plated process, the principle of this formula is the volume and the constant situation of width of steel plate
Under, according to formula L × B × T1=(L+ Δ L) × B × TfCalculate, it is assumed that the length of steel plate is 100m, and calculating process is specific
It is as follows：
100×B×T1=(100+SPM × 100) × B × Tf
It can thus be appreciated that：T1-Tf=SPM × Tf, i.e., it is SPM × T that value, which is thinned, in finishing thicknessf, wherein TfFor galvanized steel plain sheet target
Thickness value, T1For the steel plate thickness value after zincincation, B is the width of steel band.
S2, the hard belt steel thickness for rolling out mouth rolled to calculate based on steel plate thickness correction value meter and galvanized steel plain sheet target thickness value
Value, as steel band original depth value.
In embodiments of the present invention, the strip original depth value=strip target thickness value+anneal gauge be thinned value-it is zinc-plated
Value is thinned in thickness value added+finishing thickness；
Therefore, value is thinned based on anneal gauge, value is thinned in Zinc Coating Thickness value added, finishing thickness and galvanized steel plain sheet target is thick
Angle value rolls the hard belt steel thickness value (steel band original depth value) for rolling out mouth to calculate, and calculation formula is as follows：
It can thus be appreciated that：
Wherein T0To roll the hard belt steel thickness value (steel band original depth value) for rolling out mouth, TfFor steel band target thickness value.
Rolling for calculating of the embodiment of the present invention rolls out a mouthful belt steel thickness value firmly, considers subsequent anneal, zinc-plated and finishing work
The influence of ordered pair steel plate thickness, galvanized steel plain sheet target thickness can be controlled to the thickness deviation requirement in high-end Automobile Plate challenging needs
It is interior, meet the needs of market very well；Fig. 2 is to roll the hard belt steel thickness value for rolling out mouth, warp according to method provided by the invention control
Galvanized steel plain sheet thickness value after annealing, zinc-plated and finishing, as can be seen from Figure 2, abscissa represent the number of sampling, and ordinate represents sample
Galvanized steel plain sheet thickness value after annealed, zinc-plated and finishing, the target thickness value of this galvanized steel plain sheet are 0.8mm, coil of strip head, in,
The thickness value of three positions of tail arbitrfary point deviates galvanized steel plain sheet target thickness value ± 15 μm, i.e. ± the 1.6% of thickness, the μ of mean value ± 6
Within m, the thickness deviation requirement of high-end Automobile Plate demand is met well；
In addition, data maintenance is simple, there is no too high requirement for production technology, operate and possess feasibility, significant effect,
The thickness control model that the present invention designs is accurate to the thickness control of galvanized steel plain sheet finished product, efficiency high, and automaticity is high, is adapted to
Marketing, have a good application prospect.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (7)
1. a kind of accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness, it is characterised in that methods described includes as follows
Step：
S1, calculate zincincation during anneal, be zinc-plated, steel plate thickness variation delta T caused by three processes of finishing, it is described
Steel plate thickness variable quantity corresponds to steel plate thickness correction value；
S2, the hard belt steel thickness value for rolling out mouth rolled to calculate based on steel plate thickness correction value and galvanized steel plain sheet target thickness value, i.e.,
For steel band original depth value.
2. the accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness as claimed in claim 1, it is characterised in that described
Steel plate thickness correction value is thinned the thinned value of value, Zinc Coating Thickness value added and finishing thickness by anneal gauge and formed.
3. the accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness as claimed in claim 2, it is characterised in that described
Strip original depth value=strip target thickness value+anneal gauge is thinned value-Zinc Coating Thickness value added+finishing thickness and value is thinned.
4. the accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness as claimed in claim 2, it is characterised in that annealing
The calculating that value is thinned in thickness specifically comprises the following steps：
S11, the outlet stripped deviation value based on statistics go out the band of different original depths from the Relation acquisition of steel band original depth value
Steel in the Reducing thickness of annealing operation and the relation of strip original depth, wherein, outlet stripped deviation value=finishing thickness be thinned value-
Galvanized layer thickness value；
S12, regression analysis is carried out in the Reducing thickness of annealing operation and the relation of strip original depth to different original depth strips,
Draw the equation of linear regression of anneal gauge Reducing thickness and strip original depth, the expression formula of the equation of linear regression is specific such as
Under：
Value=(1.2+10.5 × steel band original depth value)/1000 (unit is thinned in anneal gauge：mm).
5. the accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness as claimed in claim 2, it is characterised in that described
Zinc Coating Thickness value added is that the zinc layer weight specified based on client is calculated, and the calculation formula is specific as follows：
Zinc Coating Thickness value added=[(nominal zinc layer weight+10)/50] * 0.0071 (unit：mm)
Wherein, from knowhow：Zinc layer weight often increases 50g, and about 7.1 μm of zinc thickness increase, 10 be that equipment setting value is inclined
The compensation of difference.
6. the accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness as claimed in claim 2, it is characterised in that described
The calculation formula of value is thinned in finishing thickness：
Value=SPM × galvanized steel plain sheet target thickness value is thinned in finishing thickness
Wherein, SPM is strip elongation percentage, i.e., the length increment divided by 100 of every 100 meters of strip extension.
7. the accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness as claimed in claim 3, it is characterised in that described
The calculation formula for rolling the hard belt steel thickness value for rolling out mouth is specific as follows：
Wherein T0To roll the hard belt steel thickness value for rolling out mouth, TfFor steel band target thickness value.
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| CN201710914419.1A CN107686958B (en) | 2017-09-30 | 2017-09-30 | A kind of accurate control method of continuous hot-dipping galvanizing steel plate finished product thickness |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112371730A (en) * | 2020-10-19 | 2021-02-19 | 马鞍山钢铁股份有限公司 | Control method for dimensional tolerance of continuous hot-dip galvanized finished product strip steel |
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| JP3464866B2 (en) * | 1996-02-21 | 2003-11-10 | 日新製鋼株式会社 | Continuous hot-dip galvanizing equipment for steel strip |
| CN101665897A (en) * | 2009-10-14 | 2010-03-10 | 天津市工大镀锌设备有限公司 | Method and device for controlling thickness of steel wire hot-plating layer |
| CN102371279A (en) * | 2010-08-26 | 2012-03-14 | 宝山钢铁股份有限公司 | Adaptive control method for increasing thickness precision of finish-rolled band steel by utilizing roll gap |
| CN102560314A (en) * | 2011-12-23 | 2012-07-11 | 首钢总公司 | Thickness setting method for ensuring thickness accuracy of galvanizing DX51D+Z end product |
| CN104376226A (en) * | 2014-11-28 | 2015-02-25 | 首钢总公司 | Method and system for calculating band steel thickness reduction amount |
-
2017
- 2017-09-30 CN CN201710914419.1A patent/CN107686958B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3464866B2 (en) * | 1996-02-21 | 2003-11-10 | 日新製鋼株式会社 | Continuous hot-dip galvanizing equipment for steel strip |
| CN101665897A (en) * | 2009-10-14 | 2010-03-10 | 天津市工大镀锌设备有限公司 | Method and device for controlling thickness of steel wire hot-plating layer |
| CN102371279A (en) * | 2010-08-26 | 2012-03-14 | 宝山钢铁股份有限公司 | Adaptive control method for increasing thickness precision of finish-rolled band steel by utilizing roll gap |
| CN102560314A (en) * | 2011-12-23 | 2012-07-11 | 首钢总公司 | Thickness setting method for ensuring thickness accuracy of galvanizing DX51D+Z end product |
| CN104376226A (en) * | 2014-11-28 | 2015-02-25 | 首钢总公司 | Method and system for calculating band steel thickness reduction amount |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112371730A (en) * | 2020-10-19 | 2021-02-19 | 马鞍山钢铁股份有限公司 | Control method for dimensional tolerance of continuous hot-dip galvanized finished product strip steel |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 243003 8 Jiuhua Road, Yushan, Ma'anshan, Anhui Applicant after: Ma'anshan Iron and Steel Co., Ltd. Address before: 243003 intellectual property department, technology center, No. 8 Hunan West Road, Yushan, Ma'anshan, Anhui Applicant before: Ma'anshan Iron and Steel Co., Ltd. |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |