CN106282873A - A kind of alloy layer of drop stamping steel and preparation method thereof - Google Patents
A kind of alloy layer of drop stamping steel and preparation method thereof Download PDFInfo
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- CN106282873A CN106282873A CN201510240321.3A CN201510240321A CN106282873A CN 106282873 A CN106282873 A CN 106282873A CN 201510240321 A CN201510240321 A CN 201510240321A CN 106282873 A CN106282873 A CN 106282873A
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Abstract
The invention discloses alloy layer of a kind of drop stamping steel and preparation method thereof, the alloy layer of Zn, Si, Al is mainly contained by plating one layer on drop stamping steel, owing to this coating containing Al, Si element, not only increase the resistance to elevated temperatures of coating, and Fe-Al-Si alloy diffusion layer tissue can be formed on substrate of steel plate, zinc element in heating process can be effectively stoped to spread to steel austenite grain boundary, the generation of suppression matrix punching press crackle.It addition, the existence of zinc element makes coating have preferable corrosion resistance, especially at undercut corrosion aspect of performance.Hence in so that drop stamping steel has good resistance to incision protection performance after having higher heat-resisting quantity and punching press in heating process.
Description
Technical field
The present invention relates to drop stamping steel coating technology, more particularly, it relates to the conjunction of a kind of drop stamping steel
Gold plate and preparation method thereof.
Background technology
In recent years, increasing to the demand of ultra-high strength steel plate along with auto industry so that superelevation is strong
Steel plate consumption increases rapidly.But, high-strength panel carries out the machine-shaping load of appearance during cold working
The problems such as height, springback capacity are big are more and more prominent.In order to solve this problem, thermoforming technology has obtained extensively
General application, at a higher temperature, steel plate has excellent processability and prepares through thermoforming
Punching parts tensile strength can reach more than 1500MPa.
Can produce oxide skin and decarburization phenomenon in traditional heat-punch member heating process, oxide skin is in punching press
During stick on mould, not only resulting in coefficient of friction between steel plate and mould increases and impact
The cooling capacity of mould, and the cleaning work of timing reduces productivity ratio.Currently for without coating
Drop stamping steel plate process the superficial oxidation skin generated after heating frequently with shot-peening, not only operation is loaded down with trivial details
But also stamping parts surface may be made to produce fine crack, limit its production and application.In order to avoid steel plate
The oxidation on surface and decarburization make hot press-formed steel plate possess high temperature resistant and corrosion resistance, at present, open
The technology such as aluminum silicon cladding, Zn-based plating layer, Zn-Ni coating that have issued are to prevent substrate oxidation and to improve anti-corrosion
Property.But, for aluminum silicon cladding, do not possess sacrificing positive pole protective value after drop stamping, and add
During heat, coating easily bonds with the ceramic roller in heating furnace, affects production efficiency.Though Zn-based plating layer has
There is preferable incision protection performance, but easily crack in punching course, and cause part to lose
Effect, and the heat treatment window of zinc coating is the narrowest.Zn-Ni coating then has good corrosion resistance and resistance to
High-temperature behavior, but its production efficiency is low, and price is higher.
CN 03113528.5 discloses a kind of hot-dip coating aluminium-zinc alloy containing rare earth and preparation method thereof, its
Hot-dip coating aluminium-zinc alloy coating comprises the mixed of aluminum 54～59%, silicon 1.2～1.8%, cerium or lanthanum or cerium and lanthanum
Closing rare earth 0.05～0.15%, remaining is zinc and inevitable impurity.This Coating composition improves heat
The corrosion resistance of coating, formability, refinement coating surface zinc flower, improves the mobility of melt.But
It is that it is mainly used in steel plate and steel construction piece surface heat coating technology field, in drop stamping technical field
And have no application.
Summary of the invention
For disadvantages mentioned above present in prior art, it is an object of the invention to provide a kind of drop stamping steel
Alloy layer and preparation method thereof, it is possible to make drop stamping steel have higher resistance to height in heating process
There is after warm nature and punching press good resistance to incision protection performance.
For achieving the above object, the present invention adopts the following technical scheme that
On the one hand, the alloy layer of a kind of drop stamping steel, the composition of described alloy layer comprises:
Zn, 2～the 8wt%Si of 40～65wt%, the Al of 25～57wt and inevitable impurity.
Described inevitable impurity contains the Fe of 1～3wt%.
On the other hand, the preparation method of the alloy layer of a kind of drop stamping steel, comprise the following steps:
A. configuring plating solution, its composition comprises Zn, 2～the 8wt%Si of 40～65wt%, and 25～57wt
Al and inevitable impurity；
B., by continuous for steel plate immersion plating in above-mentioned plating solution, substrate of steel plate surface-coated one composition of layer is made to comprise:
Zn, 2～the 8wt%Si of 40～65wt%, the Al of 25～57wt and the alloy of inevitable impurity
Coating；
C. and react between alloy layer and substrate of steel plate and form one layer of Fe-Al-Si alloy diffusion layer.
Described inevitable impurity contains the Fe of 1～3wt%.
The thickness of described alloy diffusion layer is 1～6 μm, alloy layer and the gross thickness of alloy diffusion layer
It is 18～35 μm.
Described bath temperature is 580～640 DEG C, and the steel plate immersion plating time is more than 3s, before steel plate immersion plating
Temperature is higher than bath temperature 10～30 DEG C.
Described bath temperature is 600～630 DEG C, and before steel plate immersion plating, temperature is 620～650 DEG C.
In technique scheme, alloy layer of drop stamping steel of the present invention and preparation method thereof passes through
On drop stamping steel, plating one layer mainly contains the alloy layer of Zn, Si, Al, owing to containing in this coating
There is Al, Si element, not only increase the resistance to elevated temperatures of coating, and can be formed on substrate of steel plate
Fe-Al-Si alloy diffusion layer tissue, can effectively stop zinc element in heating process to expand to steel austenite grain boundary
Dissipate, the generation of suppression matrix punching press crackle.It addition, the existence of zinc element makes coating have preferably
Corrosion resistance, especially at undercut corrosion aspect of performance.Hence in so that drop stamping steel has in heating process
There is after higher heat-resisting quantity and punching press good resistance to incision protection performance.
Accompanying drawing explanation
Fig. 1 is the metallographic structure figure of embodiments of the invention 1 gained coating；
Fig. 2 is the metallographic structure figure of embodiments of the invention 1 gained coating sample drop stamping knee；
Fig. 3 is the metallographic structure figure of embodiments of the invention 2 gained coating；
Fig. 4 is the metallographic structure figure of embodiments of the invention 2 gained coating sample drop stamping knee；
Fig. 5 is the metallographic structure figure of embodiments of the invention 3 gained coating；
Fig. 6 is the metallographic structure figure of embodiments of the invention 3 gained coating sample drop stamping knee；
Detailed description of the invention
Technical scheme is further illustrated below in conjunction with the accompanying drawings with embodiment.
The preparation method of the alloy layer of the drop stamping steel of the present invention is as follows:
First, configuring plating solution, its composition comprises Zn, 2～the 8wt%Si of 40～65wt%, and 25～57wt
Al and inevitable impurity；Inevitable impurity can have 1～3wt% Fe, its
It is to be dissolved by strip steel and submergence equipment in the plating solution and introduced.
The above-mentioned main purpose adding aluminum in zinc liquid is to improve the oxidative resistance under coating high temperature, aluminum unit
The existence of element mainly has 3 effects: one, be the high-temperature oxidation improving coating；Two, it is in leaching
React formation alloy-layer during plating with matrix, alleviate the zinc element corrosion to austenite grain boundary under high temperature,
Avoid the generation of the big crackle of matrix in punching course；Three, it is to improve the corrosion resistance of coating after punching press.
Then, by the steel plate that thickness of slab is 0.8～2.3mm after annealed reduction through above-mentioned plating solution,
The most continuous immersion plating, makes substrate of steel plate surface-coated one composition of layer comprise: the Zn of 40～65wt%,
The Al of 2～8wt%Si, 25～57wt and the Zn-Al-Si alloy layer of inevitable impurity, with
Sample impurity can exist the Fe of 1～3wt%.Found by repetition test, when above-mentioned Zn content is less than
During 40wt%, the sacrificial protective value of coating after punching press can be reduced, but when Zn content is more than 65%,
In punching course, zinc element easily induces matrix to produce big crackle, affects the use of stamping products.And silicon is first
Element primarily serve the purpose of reduce coating alloy layer thickness, improve coating processability, and silicon unit
The existence of element has the effect slowing down ferrum aluminium element diffusion reaction.Being found by experiment that, silicone content exists
When 2～8wt%, immersion processes can form more suitably Fe-Al-Si alloy diffusion layer thickness.
Above-mentioned Fe-Al-Si alloy diffusion layer is formed at alloy layer and substrate of steel plate in immersion processes reaction
Between, the thickness of Fe-Al-Si alloy diffusion layer is 1～6 μm, with the total thickness of Zn-Al-Si alloy layer
Degree controls in 18～35 μm.
In above-mentioned immersion processes, need to be controlled by described bath temperature at 580～640 DEG C, steel plate soaks
The plating time is more than 3s, and the temperature before steel plate immersion plating should be higher than that bath temperature 10～30 DEG C.Further, logical
Cross repetition test and calculate proof, controlling to be 600～630 DEG C by described bath temperature, steel plate immersion plating
It is 620～650 DEG C that front temperature controls, better.
It addition, for the heat-punch member obtaining higher-strength and quenching degree, the one-tenth of the substrate of steel plate of employing
(mass percent): C:0.12～0.4% the most also should be contained, Mn:0.8～6%, Si in Fen:
0.1～0.6, Cr:0.02～0.5, Ti:＜ 0.1, Al:＜ 0.08, P:0.004～0.04, S:＜ 0.06,
B:0.001～0.05, Ca:＜ 0.001, N:＜ 0.01, and other impurity contained in ferrum.Wherein,
Add carbon and predominantly improve the intensity of stamping parts, add the element such as manganese, boron and predominantly improve steel plate
Quenching degree.In order to ensure that steel plate has preferable corrosion resistance and prevents the generation of bigger crackle in matrix,
The austenitizing technique of coated steel plates is preferably: heating-up temperature is 860～930 DEG C, heat time heating time in stove
It is 3～12min.Coated steel plates after heating is carried out direct drop stamping, and punch forming temperature is not less than
650℃；Cool down being not less than the rate of cooling mould of 25 DEG C/s subsequently.Product after drop stamping
In product, coating microstructure is mainly by diffusion layer, zinc-rich phase, rich aluminum zinc phase, rich ferro-aluminum phase and outermost
Oxide layer is constituted.Outermost oxide layer is relatively thin, predominantly the oxide such as aluminum, zinc, silicon, this oxidation
The existence of thing has beneficially prevention zinc volatilization at high temperature.The richest ferro-aluminum phase of secondary outer layer, this phase
There is the plane corrosion resistance to improving coating advantageous particularly.And the existence of zinc-rich phase is cut improving coating
Mouth protectiveness and cut corrosion resistance are advantageous particularly.The existence of rich aluminum zinc-iron phase improves coating cathodic protection
Performance, the existence of diffusion layer is advantageous particularly to Anticrack.
The present invention uses hot dipping method to prepare heterogeneity coating, adds it subsequently in resistance-heated furnace
Heat and insulation, use hot stamping die to complete the punch forming to coated steel plates and cooling, subsequently to it
Performance is evaluated.Specific embodiment is described as follows:
Embodiment 1
Selecting of steel plate: select in steel grades containing (by weight percentage): 0.18% carbon,
0.24% silicon, 0.9% manganese, 0.015% phosphorus, 0.005% sulfur, 0.038% aluminum, 0.032% titanium, 0.003%
Boron, 0.195% chromium, 0.027% nitrogen, 0.0002% calcium, other is ferrum and inevitable impurity,
After being smelted in vacuum drying oven by steel, hot rolling, cold rolling, the steel plate thickness after cold rolling is 1.4mm.
The process of steel plate: the size choosing steel plate is 220 × 120 × 1.4mm, degreases it
Process, after clean up and dry up, it is ensured that the oil that surface of steel plate does not remain.
The allotment of plating solution: choose solution composition for (by percentage to the quality): Zn content is 55%,
Si content is 5%, and Al content is 38%, and surplus is Fe and other inevitable impurity.Will plating
Liquid composition is put into crucible after configuring and is added heat fusing.Protection plating solution surface, prevents in a nitrogen atmosphere
Oxidation.
Immersion plating technology: cold-strip steel after annealing, is cooled to 650 DEG C of insulations under hydrogen atmosphere is protected
10s makes plate temperature uniform, and immediately immersion plating is in the plating solution configured, and bath temperature is for controlling 620
DEG C, the immersion plating time is 5s, uses gas to be cooled to room temperature subsequently.The control of thickness of coating in the present invention
The main available temperature of plating solution, solution composition, the pull rate of strip steel, air knife air-blowing quantity control.
Metallographic structure after cooling as it is shown in figure 1, the whole thickness of coating after immersion plating is 28 μm, Fe-Al-Si
Alloy diffusion layer thickness is 4.2 μm.
The austenitizing of steel plate processes: the clad steel sheet of preparation is heated in stove 900 DEG C of insulation 3min
After, in fast transfer to diel, to strictly control transfer time well, otherwise austenite can change
For ferrite and pearlite or bainite.Make steel plate at the U-shaped mould of design under the effect of stamping press
Molding in tool, and by the mould with cooling system, steel plate is quenched, it is thus achieved that the geneva of high intensity
Body.Temperature during punching press is controlled, heat punching in the present embodiment by the thermocouple being welded on pressed sheet
Pressure temperature is all between 760～820 DEG C, and after heat punching, sample knee cross-sectional scans tissue is as shown in Figure 2.
From shock pressure experiments, coating surface quality is preferable, is not found to have thicker oxide layer and peeling
The generation of phenomenon, and knee do not finds bigger crackle.From the metallographic structure in cross section,
Coating after punching press is mainly by diffusion layer, zinc-rich phase, rich aluminum zinc phase, rich ferro-aluminum phase and outermost oxygen
Change layer to be constituted.After testing, after punching press, the tensile strength of steel plate is 1327MPa, and fracture elongation is
8.7%.
After plating, the corrosion resistance of steel plate measures: after drop stamping, corrosion resistance uses Neutral Salt Spray Corrosion experiment to carry out
Evaluating, concrete grammar is carried out according to GB/T10125-1997 standard.Owing in heating process, coating expands
The ferrum element dissipated can make to produce in corrosion process red rust, therefore can not judge with the time that red rust occurs
The corrosion resistance of coating, experiment have employed cross section metallographic method to evaluate the corrosion thickness of coating.Should
Erode in matrix not yet through corrosion in 7 days after Zn38Al5Si coating punching press, and the plating of control sample zinc-base
Layer steel plate (GA coating), after drop stamping, has eroded to matrix after 48h.
Clad steel sheet sample after drop stamping carries out plane and the test of cut atmospheric exposure, and plane is exposed to the sun 2
Year rear surface does not occurs that red rust, undercut corrosion time are to start red show occur when 1.5 years；And to having a competition
Sample GA plate, has eroded to lose in matrix protective effect after six months after drop stamping.
Embodiment 2
Selecting of steel plate: select in steel grades containing (by weight percentage): 0.21% carbon,
0.54% silicon, 1.9% manganese, 0.014% phosphorus, 0.004% sulfur, 0.048% aluminum, 0.038% titanium, 0.0025%
Boron, 0.205% chromium, 0.028% nitrogen, 0.0003% calcium, other is ferrum and inevitable impurity,
After being smelted in vacuum drying oven by steel, hot rolling, cold rolling, the steel plate thickness after cold rolling is 1.4mm.
Choose solution composition for (by percentage to the quality): Zn content is 40%, and Si content is 2%,
Al content is 56%, and surplus is other inevitable impurity.Cold-strip steel is protected at hydrogen atmosphere
After lower annealing, being cooled to 640 DEG C of insulation 10s and make plate temperature uniformly, immediately immersion plating is configuring
In plating solution, bath temperature is 580 DEG C, and the immersion plating time is 3.5s, uses gas to be cooled to room temperature subsequently.
Metallographic structure after cooling as it is shown on figure 3, the whole thickness of coating after immersion plating is 22 μm, Fe-Al-Si
Alloy layer thickness is 3.6 μm.
After the clad steel sheet prepared heats in stove 860 DEG C of insulation 3min, fast transfer is to stamping die
Tool carries out punch forming.After heat punching, at specimen cross section, scanning is organized as shown in Figure 4.From shock pressure experiments
On see that coating surface quality is preferable, be not found to have the generation of thicker oxide layer and skin effect phenomenon.Punching
After pressure, the tensile strength of steel plate is 1527MPa, and fracture elongation is 5.7%.
Do not erode to yet in matrix through salt air corrosion in 5 days after this Zn56Al2Si coating punching press.To heat
After punching press, clad steel sheet sample carries out plane and the test of cut atmospheric exposure, and plane is exposed to the sun 2 years rear surfaces
Do not occur that red rust, undercut corrosion time are not occur red rust yet after 2 years.
Embodiment 3
Selecting of steel plate: select in steel grades containing (by weight percentage): 0.38% carbon,
0.20% silicon, 2.3% manganese, 0.016% phosphorus, 0.006% sulfur, 0.036% aluminum, 0.036% titanium, 0.0020%
Boron, 0.215% chromium, 0.027% nitrogen, 0.0002% calcium, other is inevitable impurity, by steel
After smelting in vacuum drying oven, hot rolling, cold rolling, the steel plate thickness after cold rolling is 1.4mm.
Choose solution composition for (by percentage to the quality): Zn content is 63%, and Si content is 7%,
Al content is 28%, and surplus is other inevitable impurity.Cold-strip steel is protected at hydrogen atmosphere
After lower annealing, being cooled to 620 DEG C of insulation 10s and make plate temperature uniformly, immediately immersion plating is configuring
In plating solution, bath temperature is 600 DEG C, and the immersion plating time is 6s, uses gas to be cooled to room temperature subsequently.
Metallographic structure after cooling as it is shown in figure 5, the thickness of coating after immersion plating is 32 μm, alloy layer thickness
It is 1.8 μm.
The austenitizing of steel plate processes: the clad steel sheet of preparation is heated in stove 930 DEG C of insulation 3min
After, in fast transfer to diel, punch forming.Sample knee cross-sectional scans tissue after heat punching
As shown in Figure 4.From shock pressure experiments, coating surface quality is preferable, is not found to have thicker oxidation
Layer and the generation of skin effect phenomenon, and knee matrix do not finds bigger crackle.Steel plate after punching press
Tensile strength be 1822MPa, fracture elongation is 3.2%.
Do not erode to yet in matrix through salt air corrosion in 4 days after this Zn28Al7Si coating sample punching press.
Clad steel sheet sample after drop stamping is carried out plane and the test of cut atmospheric exposure, after plane is exposed to the sun 2 years
At surface and cut, red rust occurs.
In sum, the steel plate of alloy layer using the present invention and preparation method thereof gained is for heat punching
Pressure, can obtain the drop stamping part of high intensity, high corrosion-resistant, compared with existing Zn-based plating layer steel plate
Have in preferable resistance to elevated temperatures, and direct hot stamping operation to produce and expand to the big of matrix
Crackle, and compared with aluminum silicon cladding, its coating incision protection performance and damage resistant corrosive nature are shown
Write and improve.
Those of ordinary skill in the art is it should be appreciated that above embodiment is intended merely to
The bright present invention, and it is not used as limitation of the invention, as long as at the spirit of the present invention
In, change, the modification of embodiment described above all will be fallen in the range of claims of the present invention.
Claims (7)
1. the alloy layer of a drop stamping steel, it is characterised in that:
The composition of described alloy layer comprises: Zn, 2～the 8wt%Si of 40～65wt%, and 25～57wt
Al and inevitable impurity.
2. the alloy layer of drop stamping steel as claimed in claim 1, it is characterised in that:
Described inevitable impurity contains the Fe of 1～3wt%.
3. the preparation method of the alloy layer of a drop stamping steel, it is characterised in that comprise the following steps:
A. configuring plating solution, its composition comprises Zn, 2～the 8wt%Si of 40～65wt%, and 25～57wt
Al and inevitable impurity；
B., by continuous for steel plate immersion plating in above-mentioned plating solution, substrate of steel plate surface-coated one composition of layer is made to comprise:
Zn, 2～the 8wt%Si of 40～65wt%, the Al of 25～57wt and the alloy of inevitable impurity
Coating；
C. and react between alloy layer and substrate of steel plate and form one layer of Fe-Al-Si alloy diffusion layer.
4. the alloy layer of drop stamping steel as claimed in claim 3, it is characterised in that:
Described inevitable impurity contains the Fe of 1～3wt%.
5. the alloy layer of drop stamping steel as claimed in claim 3, it is characterised in that:
The thickness of described alloy diffusion layer is 1～6 μm, alloy layer and the gross thickness of alloy diffusion layer
It is 18～35 μm.
6. the preparation method of the alloy layer of drop stamping steel as claimed in claim 3, it is characterised in that:
Described bath temperature is 580～640 DEG C, and the steel plate immersion plating time is more than 3s, before steel plate immersion plating
Temperature is higher than bath temperature 10～30 DEG C.
7. the preparation method of the alloy layer of drop stamping steel as claimed in claim 6, it is characterised in that:
Described bath temperature is 600～630 DEG C, and before steel plate immersion plating, temperature is 620～650 DEG C.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019095514A1 (en) * | 2017-11-16 | 2019-05-23 | 河钢股份有限公司 | Coating for hot stamping-formed steel and production method therefor |
| CN112639154A (en) * | 2018-08-30 | 2021-04-09 | Posco公司 | Aluminum-zinc alloy plated steel sheet having excellent hot formability and corrosion resistance, and method for producing same |
| CN115135798A (en) * | 2020-07-14 | 2022-09-30 | 日本制铁株式会社 | Hot-stamped component and method for producing same |
| WO2022228574A1 (en) * | 2021-04-30 | 2022-11-03 | 宝山钢铁股份有限公司 | Hot stamping component having tensile strength ≥1000 mpa and fabrication method therefor |
| CN116987997A (en) * | 2023-07-25 | 2023-11-03 | 鞍钢股份有限公司 | Surface blackened high-aluminum hot dip coating steel plate and manufacturing method thereof |
| US11884998B2 (en) | 2017-03-31 | 2024-01-30 | Nippon Steel Corporation | Surface treated steel sheet |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11884998B2 (en) | 2017-03-31 | 2024-01-30 | Nippon Steel Corporation | Surface treated steel sheet |
| WO2019095514A1 (en) * | 2017-11-16 | 2019-05-23 | 河钢股份有限公司 | Coating for hot stamping-formed steel and production method therefor |
| CN112639154A (en) * | 2018-08-30 | 2021-04-09 | Posco公司 | Aluminum-zinc alloy plated steel sheet having excellent hot formability and corrosion resistance, and method for producing same |
| CN112639154B (en) * | 2018-08-30 | 2023-06-16 | 浦项股份有限公司 | Aluminum-zinc alloy plated steel sheet excellent in hot formability and corrosion resistance, and method for producing same |
| CN115135798A (en) * | 2020-07-14 | 2022-09-30 | 日本制铁株式会社 | Hot-stamped component and method for producing same |
| CN115135798B (en) * | 2020-07-14 | 2023-10-31 | 日本制铁株式会社 | Hot stamping member and method of manufacturing the same |
| WO2022228574A1 (en) * | 2021-04-30 | 2022-11-03 | 宝山钢铁股份有限公司 | Hot stamping component having tensile strength ≥1000 mpa and fabrication method therefor |
| CN116987997A (en) * | 2023-07-25 | 2023-11-03 | 鞍钢股份有限公司 | Surface blackened high-aluminum hot dip coating steel plate and manufacturing method thereof |
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Application publication date: 20170104 |