CN108842122A - A kind of hot-dip coating steel plate and its manufacturing method - Google Patents
A kind of hot-dip coating steel plate and its manufacturing method Download PDFInfo
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- CN108842122A CN108842122A CN201810883447.6A CN201810883447A CN108842122A CN 108842122 A CN108842122 A CN 108842122A CN 201810883447 A CN201810883447 A CN 201810883447A CN 108842122 A CN108842122 A CN 108842122A
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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
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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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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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
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
Abstract
The present invention provides a kind of hot-dip coating steel plate and its manufacturing methods, the hot-dip coating steel plate, the hot-dip coating formed including substrate and on substrate includes alloy-layer between the hot-dip coating and substrate, and the alloy layer thickness minimum value is 4* (HvFe/HvM/6)0.5Micron, wherein HvFeRefer to the microhardness of substrate, and HvMRefer to that the microhardness of alloy-layer, the alloy layer thickness maximum value are 2 microns.The present invention can get the hot-dip coating steel plate for producing body of a motor car production, and the elongation strain trace defect of steel plate is completely eliminated.Improve the problem of hot-dip coating steel plate in existing production technology is easy to appear areal stretch strain mark defect during small deformation.
Description
Technical field
The invention belongs to technical field of steel rolling, in particular to a kind of hot-dip coating steel plate and its manufacturing method.
Background technique
Hot-dip coating steel plate is normally used for producing body of a motor car, such as the plating of galvanizing by dipping coating, dip galvanized aluminum magnesium
Layer, hot-dip aluminizing silicon cladding etc..Some kinds of hot-dip coating steel plate is easy institute occur on surface in vehicle body forming process
There is the macroscopic of series of parallel dense arrangement in 45 ° of directions with rolling direction in the elongation strain trace defect of meaning, surface
Fold texture, as shown in Figure 1.Since body of a motor car has very high requirement to painting quality, and this fold texture is unsatisfactory for it
Coating specification.The hot-dip coating steel plate for being easy to happen elongation strain trace defect includes baking hardened steel, low-alloy high-strength steel, aluminium
Killed steel, structural steel etc..
Hot-dip coating steel plate generally uses the production stream of continuous acid-washing, continuous cold rolling, continuous annealing, hot-dip, finishing
Journey.Usually, by adjusting finishing process, the occurrence degree of elongation strain trace can be controlled to a certain extent.But by
It is mainly used for adjusting the forming property of material in finishing process, while the operation window of polishing machine is limited, for certain high-strength steel
Finishing rolling reduction ratio strong enough can not be provided, therefore be difficult to completely eliminate the elongation strain of steel grade by finishing process
Trace.
Alloying element content by adjusting these steel grades is also able to suppress the generation of elongation strain trace.However these steel grades
Schedule of reinforcement require in steel plate there are more solid solution interstitial atom, be such as dissolved carbon atom, be dissolved nitrogen-atoms, this is just determined
It cannot be completely eliminated elongation strain trace by alloying element adjusting.
Summary of the invention
In view of the above-mentioned drawbacks in the prior art, the main purpose of the present invention is to provide a kind of hot-dip coating steel plate and
Its manufacturing method can get the hot-dip coating steel plate for producing body of a motor car production, and the elongation strain trace defect of steel plate
It is completely eliminated.
In order to achieve the above object, the present invention adopts the following technical scheme that：A kind of hot-dip coating steel plate, including substrate with
And the hot-dip coating formed on substrate, it include alloy-layer between the hot-dip coating and substrate, the alloy thickness
Degree minimum value is 4* (HvFe/HvM/6)0.5Micron, wherein HvFeRefer to the microhardness of substrate, and HvMRefer to the micro- of alloy-layer
Hardness, the alloy layer thickness maximum value are 2 microns.
As a further preference, the microhardness of alloy-layer is 1~2 times of substrate microhardness.
It as a further preference, in the alloy-layer include one of Ni, Cr, Cu, Pt, Au, W, Ti or a variety of
Metallic element.
As a further preference, the alloy-layer is column structure, layered structure, mono-crystalline structures, isometric crystal structure etc.
A variety of space structures.
Another object of the present invention is to provide the manufacturing methods of above-mentioned hot-dip coating steel plate, include the following steps：
Slab is obtained after smelting molten steel, the slab is heated, using roughing, finish rolling, cooling, cold rolling, surface
Processing, heat treatment, hot-dip and after batching, obtain steel plate finished product；
Wherein, the steel plate finished product includes substrate and the hot-dip coating formed on substrate, the hot-dip coating
It include alloy-layer between substrate.
As a further preference, the alloy layer thickness minimum value is 4* (HvFe/HvM/6)0.5Micron, wherein HvFeIt is
The microhardness of finger substrate, and HvMRefer to that the microhardness of alloy-layer, the alloy layer thickness maximum value are 2 microns.
As a further preference, the microhardness of alloy-layer is 1~2 times of substrate microhardness.
It as a further preference, in the alloy-layer include one of Ni, Cr, Cu, Pt, Au, W, Ti or a variety of
Metallic element.
As a further preference, the alloy-layer is column structure, layered structure, mono-crystalline structures, isometric crystal structure etc.
A variety of space structures.
The beneficial effects of the invention are as follows：Hot-dip coating steel plate of the present invention, the heat formed including substrate and on substrate
Immersion plating coating, includes alloy-layer between the hot-dip coating and substrate, and the effect of alloy-layer is that smooth substrate is deforming
The fold step occurred in the process, to eliminate the influence to zinc layers surface.In order to have the function that these two aspects, alloy-layer is needed
Has certain thickness, it usually needs 4* (HvFe/HvM/6)0.5.In addition, metamorphosis between alloy-layer and substrate can be with
It is characterized with the nonhomogeneous hardness of the two.The hardness of alloy-layer is higher, shows that alloy-layer is less susceptible to deform, therefore identical
Under substrate surface deformation condition, the alloy layer thickness needed is thinner.It finds after study, when alloy layer thickness reaches 4* (HvFe/
HvM/6)0.5When micron, alloy-layer has good inhibiting effect to substrate fold step.Certainly, the thickness of alloy-layer can not
It is unlimited to increase.Too thick alloy-layer can significantly reduce the binding force of hot-dip coating, and plating adhesion is caused to decline, while alloy
Potential difference between layer and coating will cause the decline of corrosion resistance, show as being easy to happen spot corrosion and notch corrosion, with
And there is the problems such as resistance to blacking ability decline in part coating.Therefore, the maximum thickness of alloy-layer needs to consider.Guaranteeing to meet
Under the premise of surface quality, alloy layer thickness should be thinned as far as possible.Practical application it can be confirmed that steel plate of the present invention elongation strain trace
Defect is completely eliminated, and is the hot-dip coating steel plate that can be used for producing body of a motor car production.It improves in existing production technology
Hot-dip coating steel plate is easy to appear the problem of areal stretch strain mark defect during small deformation.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.
The cross-sectional structure schematic diagram of the existing hot-dip coating steel plate of Fig. 1.
The cross-sectional structure schematic diagram of Fig. 2 test specimen of the embodiment of the present invention.
The alloy-layer cylindrical space structural schematic diagram of Fig. 3 A test specimen of the embodiment of the present invention.
The alloy-layer of Fig. 3 B test specimen of the embodiment of the present invention is layered space structural schematic diagram.
The alloy-layer monocrystalline space structure schematic diagram of Fig. 3 C test specimen of the embodiment of the present invention.
The alloy-layer equiax crystal space structure schematic diagram of Fig. 3 D test specimen of the embodiment of the present invention.
Specific embodiment
The present invention is further described in detail With reference to embodiment, and the embodiment provided is only for explaining
The present invention is stated, the range being not intended to be limiting of the invention.
The cross-sectional view of the hot-dip coating steel plate used in the front body panel is as shown in Figure 1, and according to the present invention
The cross-sectional view for the hot-dip galvanizing sheet steel that embodiment obtains is as shown in Figure 2.
As shown in Figure 1, forming hot-dip coating 2 on substrate 1 in existing hot-dip galvanizing sheet steel.When punching press occurs for steel plate
When forming, the crystal grain on 1 surface of substrate causes discontinuous yielding occur and crystal grain turns due to stress raisers-relaxation effect difference
Dynamic, this discontinuous surrender and crystal grain rotation are macroscopically showing as the fold texture at 45 ° with rolling direction, cause substrate
There is fold texture in 1 surface, and the fold texture on this 1 surface of substrate forms local compression to coating 2, so that coating 2 occurs
Local deformation.Due to being continuous metallurgical compound of reaction between coating 2 and substrate 1, local deformation harmony is consistent
Property is very high, and the microcosmic local deformation of substrate 1 can be transmitted to 2 surface of coating, and 2 surface of coating is caused to strain after a deformation
Trace.Discontinuous rotation due to this strain mark from crystal grain, the step height of strain mark are typically not greater than crystallite dimension,
It is stringent to derive the half or so it can be found that this strain mark height is usually crystal grain equivalent diameter.However if discontinuous rotation
Than more serious, also will appear cluster and banded crystal grain step accumulation, caused by strain mark height can work as considerably beyond crystal grain
Diameter is measured, thus obvious feel occurs.
It include substrate 10 in hot-dip galvanizing sheet steel as shown in Fig. 2, example according to the present invention, the Zn layer on substrate 10
Alloy-layer 30 between 20 and substrate 10 and Zn layer 20.
In embodiments of the present invention, the effect of alloy-layer 30 is the fold platform that smooth substrate 10 occurs in deformation process
Rank, to eliminate the influence to 30 surface of zinc layers.In order to have the function that these two aspects, alloy-layer 30 needs to have certain thickness
Degree, it usually needs 4* (HvFe/HvM/6)0.5, wherein HvFeRefer to the microhardness of substrate, and HvMRefer to the micro- hard of alloy-layer
Degree.In addition, the metamorphosis between alloy-layer and substrate can use the nonhomogeneous hardness characterization of the two.The hardness of alloy-layer is higher,
Show that alloy-layer is less susceptible to deform, therefore under identical substrate surface deformation condition, the alloy layer thickness needed is got over
It is thin.It finds after study, when alloy layer thickness reaches 4* (HvFe/HvM/6)0.5When micron, alloy-layer has substrate fold step
There is good inhibiting effect.Certainly, the thickness of alloy-layer can not infinitely increase.Too thick alloy-layer can significantly reduce hot-dip
The binding force of coating, causes plating adhesion to decline, while the potential difference between alloy-layer and coating will cause corrosion resistance
The decline of energy shows as being easy to happen spot corrosion and notch corrosion and the problems such as resistance to blacking ability decline occurs in part coating.Cause
This, the maximum thickness of alloy-layer needs to consider.Under the premise of guaranteeing to meet surface quality, alloy layer thickness should subtract as far as possible
It is thin.In embodiments of the present invention, the maximum thickness for designing alloy-layer is 2 microns, and preferred alloy layer thickness maximum value is 1.8
Micron.
In general, in order to inhibit the fold step of substrate, the hardness of alloy-layer is no less than the hardness of substrate.However,
If the hardness of alloy-layer is too high, will appear macroscopic deformation between alloy-layer and substrate in steel plate punched deformation process can not be assisted
, there is the problems such as break apart between Pressing Deformation metacoxal plate and alloy-layer in the problem of tune.Therefore think by experimental study, close
The microhardness of layer gold should be 1~2 times of substrate microhardness.
The selection of alloy-layer metal species is more flexible, the main stability for considering alloy-layer during hot-dip and
The stability reacted between plating solution, furthermore the hardness of alloy-layer metal is also Consideration.The temperature of hot-dip plating solution is general
No more than 700 DEG C, for example the bath temperature that aluminium silicon cladding uses is higher, reaches 650 DEG C~700 DEG C, therefore should select fusing point
Temperature is more than 700 DEG C of material manufacture alloy-layer.Simultaneously, it is contemplated that the hardness requirement of alloy-layer.Preferably, can choose Ni,
Cr, Cu, Pt, Au, W, Ti etc..Wherein the hardness of Ni, Cu, Au are lower, can be used for the steel based on ferritic structure, and Pt, Cr
Hardness is moderate, can be used for the steel based on pearlitic structrure, and Ti, W hardness are higher, can be used for the steel based on martensitic structure.
Certain requirement should be proposed to the space structure of alloy-layer.The tool of alloy-layer is not provided in the embodiment of the present invention
Preparation process, if but alloy-layer is excessively loose, influence whether alloy-layer to the inhibiting effect of the microcosmic local deformation of substrate.
, it is specified that the space structure of alloy-layer can be column structure, layered structure, mono-crystalline structures, equiax crystal knot in the embodiment of the present invention
Structure, as shown in Figure 3.Fig. 3 A is the schematic diagram of column structure, and alloy grain is in the form of a column distribution, and cylindrical central axis is basically perpendicular to
Substrate.The advantages of this space structure, is that axial extension is had excellent performance, and can utmostly inhibit substrate fold step to plating
The influence of zinc layers but has the disadvantage that lateral performance is poor, is easy to appear alloy-layer stripping problem.Fig. 3 B is layered structure signal
Figure, alloy are sprawled along with substrate-parallel direction, are divided into many levels in substrate normal orientation.The space structure advantage is cross
To better performances, it is not easy to alloy-layer removing occur, also can preferably inhibit corrosion penetration, but defect is exactly that normal orientation is rigid
It spends poor, is easily deformed, therefore to inhibiting influence of the substrate fold step to zinc coat unfavorable.Fig. 3 C is mono-crystalline structures signal
Figure.Entire alloy-layer is a crystal grain.The space structure has taken into account column structure and layered structure advantage, and it is difficult that disadvantage is to prepare
It spends larger.Fig. 3 D is isometric crystal structure, and the different many crystal grain of size direction are distributed in alloy-layer.The space structure advantage is
Column structure and layered structure merits and demerits are combined, therefore properties are all relatively average, disadvantage is in alloy-layer
Crystal grain boundary area is larger, therefore has the problem of corrosion-resistant aspect.
Above-mentioned alloy-layer can be completed to prepare by electro-plating method.This method can form the relatively uniform alloy of thickness
Layer.Substrate needs to remove the oxidation film and other impurities on surface in advance, for example can pass through pickling and ungrease treatment.Through overpickling
After ungrease treatment, substrate is put into electrolytic cell and is electroplated, cation containing alloy-layer metal in electroplate liquid and
Other are generally alloy or pure metal containing alloy-layer metal, can also use for conductive electrolyte, anode of electrolytic cell
Inert metal keeps cation concn in electrolytic cell to stablize as anode and by way of adding electrolyte.Make for example, by using Ni
When for alloy-layer, generally Ni can be used as anode material, and generally can be containing the cation of Ni in electrolyte and other are non-
The anion of oxidisability.The current density of electroplating processes is typically not greater than 5A/cm2, too big electric current will cause anodic passivity mistake
Effect, but will not be too small, such as less than 0.1A/cm2, too small Faradaic current can be unstable, is easy to be interfered by stray electrical current.
The space structure of alloy-layer can be by electroplating technological parameter, such as current density, current switch time scale, electrolysis time, sun
Pole material etc. is controlled.Such as in order to obtain layered structure, multiple spot anode mode can be used, substrate is subjected to repeatedly electricity
Plating, plating obtains one layer of electroplated layer every time.Such as isometric crystal structure in order to obtain, it can control the switch ratio and electricity of electric current
Waveform is flowed, using pulse current, electroplated layer grain growth direction can be smashed, obtain isometric crystal structure.
If it is dip galvanized, then heating the substrate to 700 DEG C to 900 DEG C temperature after completing alloy-layer preparation, adding
The mixing reducing atmosphere that nitrogen and hydrogen are generally used when hot, then cools down, and then immerses substrate and contains about 0.25% (matter
Measure percentage) in the zinc liquid of even less Al content, zinc liquid temperature is 440 DEG C to 470 DEG C.If the Al content in zinc liquid is too
Height will lead to the wellability decline between zinc liquid and substrate, while be unfavorable for that metallurgical reaction occurs between zinc liquid and substrate.Work as zinc
When liquid temperature is lower than 440 DEG C, zinc liquid mobility is deteriorated, it is difficult to which guarantee obtains homogeneous coating.When zinc liquid temperature is higher than 470 DEG C,
The evaporation of zinc liquid is obvious to be accelerated, and a variety of surface defects are generated.The temperature that substrate immerses zinc liquid is usually essentially identical with zinc liquid temperature, control
Range processed is -10 DEG C of zinc liquid temperature to+10 DEG C of zinc liquid temperature.If substrate temperature is too low, zinc liquid can be made to be difficult to send out with substrate
Raw reaction.And if substrate temperature is too high, will lead to substrate reacts excessively fierce with zinc liquid, forms frangible compounds.
Explanation presented below to the embodiment of the present invention.
【Embodiment and comparative example】
Table 1 is the embodiment of the present invention, and related steel grades are 0.1%C-1.1%Mn-0.3%Si-0.04%Al,
Hot dip galvanizing coating and alloy layer thickness summation are 7 microns.Alloy-layer space structure column structure, layered structure, mono-crystalline structures, etc.
The code name of axialite structure is respectively C, L, S and E.Surface strain trace after evaluating sample deformations 5% using visual and touch method,
5 grades have step feel to be obvious, and 4 grades have feel to be slight, and 3 grades for no feel but visually as it can be seen that 2 grades are visually slightly may be used
See, 1 grade is visually invisible.The adhesiveness of alloy-layers and zinc coat is evaluated using 180 ° of methods of bending, if 180 ° of bending
Alloy-layer or zinc coat removing occur afterwards, shows that adhesiveness is unqualified, is expressed as NO, if showing to glue there is no removing
Attached property is qualified, is expressed as YES.Using the corrosion-resistance properties of neutral salt spray test evaluation sample, after observing salt air corrosion in 48 hours
Surface red rust area ratio usually requires that red rust area is no more than 3%.
Table 1
Although the preferred embodiment of the application has been described, but one of ordinary skilled in the art once knows substantially
Creative concept, then additional changes and modifications may be made to these embodiments.It is wrapped so the following claims are intended to be interpreted as
It includes preferred embodiment and falls into all change and modification of the application range.
Obviously, those skilled in the art can carry out various modification and variations without departing from the essence of the application to the application
Mind and range.In this way, if these modifications and variations of the application belong to the range of the claim of this application and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
Claims (9)
1. a kind of hot-dip coating steel plate, it is characterised in that：The hot-dip coating formed including substrate and on substrate, it is described
It include alloy-layer between hot-dip coating and substrate, the alloy layer thickness minimum value is 4* (HvFe/HvM/6)0.5Micron,
Middle HvFeRefer to the microhardness of substrate, and HvMRefer to that the microhardness of alloy-layer, the alloy layer thickness maximum value are 2 micro-
Rice.
2. hot-dip coating steel plate according to claim 1, it is characterised in that：The microhardness of the alloy-layer is substrate
1~2 times of microhardness.
3. hot-dip coating steel plate according to claim 1, it is characterised in that：Include in the alloy-layer Ni, Cr,
One of Cu, Pt, Au, W, Ti or Determination of multiple metal elements.
4. hot-dip coating steel plate according to claim 1, it is characterised in that：The alloy-layer is selected from column structure, divides
Layer structure, mono-crystalline structures and isometric crystal structure.
5. the manufacturing method of hot-dip coating steel plate as described in claim any one of 1-4, it is characterised in that：Including walking as follows
Suddenly：
Obtain slab after smelting molten steel, the slab heated, using roughing, finish rolling, cooling, cold rolling, surface treatment,
Heat treatment, hot-dip and after batching, obtain steel plate finished product；
Wherein, the steel plate finished product includes substrate and the hot-dip coating formed on substrate, the hot-dip coating and base
It include alloy-layer between plate.
6. the manufacturing method of hot-dip coating steel plate according to claim 5, it is characterised in that：The alloy layer thickness is minimum
Value is 4* (HvFe/HvM/6)0.5Micron, wherein HvFeRefer to the microhardness of substrate, and HvMRefer to the microhardness of alloy-layer,
The alloy layer thickness maximum value is 2 microns.
7. the manufacturing method of hot-dip coating steel plate according to claim 5, it is characterised in that：The alloy-layer it is micro- hard
Degree is 1~2 times of substrate microhardness.
8. the manufacturing method of hot-dip coating steel plate according to claim 5, it is characterised in that：Include in the alloy-layer
One of Ni, Cr, Cu, Pt, Au, W, Ti or Determination of multiple metal elements.
9. the manufacturing method of hot-dip coating steel plate according to claim 5, it is characterised in that：The alloy-layer is selected from column
Structure, layered structure, mono-crystalline structures and isometric crystal structure.
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Cited By (4)
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| CN110509631A (en) * | 2019-07-25 | 2019-11-29 | 首钢集团有限公司 | One kind is aluminized silicon steel plate and preparation method thereof |
| WO2021077526A1 (en) * | 2019-10-23 | 2021-04-29 | 首钢集团有限公司 | Composite coated steel and preparation method therefor |
| CN114032457A (en) * | 2021-10-18 | 2022-02-11 | 首钢集团有限公司 | Continuous hot-dip galvanized high-strength steel plate and manufacturing method thereof |
| CN114807805A (en) * | 2022-05-31 | 2022-07-29 | 鞍钢股份有限公司 | Hot galvanizing production method for high-strength steel and ultrahigh-strength steel |
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| CN114807805A (en) * | 2022-05-31 | 2022-07-29 | 鞍钢股份有限公司 | Hot galvanizing production method for high-strength steel and ultrahigh-strength steel |
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