CN107099748A - The high-temperature molding strong zinc-aluminum-magnesium clad steel sheet of superelevation and its manufacture method - Google Patents
The high-temperature molding strong zinc-aluminum-magnesium clad steel sheet of superelevation and its manufacture method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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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
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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
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention discloses a kind of high-temperature molding strong zinc-aluminum-magnesium clad steel sheet of superelevation and its manufacture method, steel plate includes following chemical composition and its percetage by weight：C：0.2~0.8%, Si：0.08~0.6%, Mn：1.5~5.0%, Al≤0.08%, N≤0.005%, remaining is Fe and inevitable impurity；Coating includes following chemical composition and its percetage by weight：Al：1.5~20%, Mg：1.3~7%, remaining is Zn and inevitable impurity.The hot forming produced by the present invention strong zinc-aluminum-magnesium clad steel sheet of superelevation, after substrate hot forming is met on the premise of tensile strength >=1700MPa, elongation after fracture >=5%, coating is continuous whole after being heated at high temperature punch forming, without the crackle for extending to matrix；Zn contents are integrally higher than 30% in coating alloy phase, and coating corrosion resistance is excellent；Steel of the present invention can meet corrosion-proof and high-strength degree Automobile Plate lightweight demand.
Description
Technical field
The present invention relates to metallurgical hot extrusion briquetting technique, in particular to a kind of high-temperature molding strong zinc-aluminum-magnesium clad steel sheet of superelevation
And its manufacture method.
Background technology
In recent years, the market demand of automobile thermoformed parts is in explosive growth trend, and thermoformed part is on white body
Application percentage be up to 45%, it is contemplated that the coming five years will double the above.In thermoforming technology earlier, the surface of steel plate
Do not handled by coating, a certain degree of oxidation can occur for surface during thermoforming, produce skin decarburization and oxidation peeling shows
As reducing production efficiency, oxide on surface can be removed using the method for chromium shot-peening.
With the development of thermoforming technology, coating technology is increasingly being applied to thermoforming steel.Coating can be prevented into
Surface oxidation and decarburization during type, moreover it is possible to improve the Corrosion Protection after paint dress.The heat of different coating has been developed at present
Stamping steel plate, such as：Aluminium silicon cladding (Al-10%Si), hot pure zinc plating (GI) coating, kirsite (GA) coating and plating zinc-nickel
(Zn-10%Ni) coating etc..Al-Si coating high temperature resistants, but do not possess incision protection performance；Electroplate zinc-nickel (Zn-10%Ni) plating
Layer has preferable heat-resisting quantity and resistance to incision protection performance, and its weak point is expensive, and productivity ratio is low；GI and GA coating
Crackle induction steel matrix cracking is easily formed in thermoforming process.Accordingly, it would be desirable to develop a kind of the new of high temperature resistant shaping
Coating ultra-high strength steel plate, meets growing user's use demand.
US6296805B1 and FR2833504A1 disclose high corrosion-resistant hot rolling and cold rolling Al-Si clad plates after heat treatment
Production method, steel plate chemical composition is：C：0.2~0.7%, Si：0.1~0.35%, Mn：0.8~1.5%, P：No more than
0.05%th, S：No more than 0.03% and Al：No more than 0.1%, additionally it is selected from following element containing one or more：Ti is not
More than 0.1%, Cr：0.01~1% and B：0.0005~0.01%.JP2015514695 and KR20090070150 disclose plating
The thermoformed article and manufacture method of aluminium steel plate, coating chemical composition is：Si is less than less than 12%, Cr less than 0.7%, Mo
0.7%, 20~80g/m of coating weight2.JP4724780 and CN200480009561.2 disclose coating chemical composition：40~
70%Al, 3~15%Si, Fe.
JP2013503254 discloses steel plate chemical composition：C：0.1~0.5%, Si：0.05~0.50%, Mn：0.8~
3.0%th, Cr：0~1.0%, Mo：0~0.05%, Ti：0~0.02%, Nb：0~0.1%, V：0~1.0%, B：0~
0.01%, Ni：0~2.0%.Coating chemical composition：Mn：0.15~0.5%, Fe：9~12%, Al：0.05~0.25%, Zn.
CN102851629B discloses a kind of hot-forming with silicon steel plate and its manufacture method of aluminizing, coating chemical composition：Surface of steel plate
Al-Si coating is coated with, Al content 96~98%, Si contents 1.3~3.8%, content of rare earth by mass percentage wherein in coating
0.1~0.3%, alloy layer thickness≤5 μm, Si contents control in alloy-layer is for 3~6%.Hot plating technology：Steel plate is first used
NOF stoves carry out pre-oxidation treatment；Reduce furnace atmosphere H2：20~50%, surplus is N2；Dew point control is -20~-60 in stove
℃；Annealing temperature is 800~850 DEG C；Bath temperature is 680~750 DEG C；Steel plate enters pot temperature for 650~750 DEG C, during immersion plating
Between be 2~5s；Steel plate is after aluminum pot extraction to carrying out fast quickly cooling alusil alloy freezing point with >=120 DEG C/s；Then again with
30~100 DEG C/s speed is cooled to 420~480 DEG C, and the overaging that 10~300s is then carried out between 350~450 DEG C is moved back
Fire processing.It is Al-Si or Zn-Mn-Fe coating disclosed in foregoing prior art, because of Coating composition and technique limitation, it is difficult to full
The demand of sufficient high corrosion-resistant.
The content of the invention
Present invention aim to provide a kind of strong zinc-aluminum-magnesium clad steel sheet of high-temperature molding superelevation and its manufacture method,
The armor plate strength and corrosion resistance are high and lightweight.
To achieve the above object, the technical solution adopted by the present invention is：A kind of high-temperature molding strong zinc-aluminum-magnesium coating of superelevation
Steel plate, steel plate includes following chemical composition and its percetage by weight：C：0.2~0.8%, Si：0.08~0.6%, Mn：1.5~
5.0%, Al≤0.08%, N≤0.005%, remaining is Fe and inevitable impurity；Coating with plating solution include it is following chemistry into
Divide and its percetage by weight：Al：1.5~20%, Mg：1.3~7%, remaining is Zn and inevitable impurity.
Further, steel plate includes following chemical composition and its percetage by weight：C：0.25~0.53%, Si：0.25~
0.35%, Mn：2.35~2.8%, Al：0.034~0.06%, N：0.0028~0.0049%, remaining is Fe and inevitable
Impurity.
Further, steel plate also includes following chemical composition and its percetage by weight：Cr：0.1~2.0%, B：0.001~
One or more in 0.05%, and following three kinds of elements：Ti：0.01~1.0%, Nb：0.01~0.1%, V：0.01~
0.1%.
Further, coating includes following chemical composition and its percetage by weight with plating solution：Al：1.5~7%, Mg：1.3
~7%, and Al/Mg >=1, remaining is Zn and inevitable impurity.
Further, the base steel tissue of steel plate includes the martensite that percentage by volume is 95~100%.
The manufacture method of the above-mentioned high-temperature molding strong zinc-aluminum-magnesium clad steel sheet of superelevation, successively including smelting step, continuous casting step
Suddenly, hot continuous rolling step, cold continuous rolling step, hot-dip step, finishing step, hot forming step, it is characterised in that：The hot dipping
Plate step in, steel band is heated to 780~840 DEG C in -60~30 DEG C of dew point, then 1 ＜ percentage by volumes≤
30% H2Under atmosphere, 445~510 DEG C are cooled to 10~30 DEG C/s cooling velocity, 0~100s is incubated, subsequent immersion plating is arrived
In plating solution, bath temperature is 440~480 DEG C, is finally cooled to room temperature with cooling velocity >=30 DEG C/s；The hot forming step
In, by heating of plate blank to complete austenitizing, it is incubated after 1~10min and carries out high temperature punch forming, and with the cold of 10~30 DEG C/s
But speed is cooled to room temperature.
Further, steel plate coating surface before hot forming includes three kinds of tissues：Zn/Al eutectic structures, Zn/Al/
Zn2Mg ternary eutectics tissue and pure Zn particles；Zn/Al/Zn2Piece interlamellar spacing≤1 μm of Mg ternary eutectic tissues；Base steel and coating
Between be made up of ferro-aluminum or ferro-aluminum zinc intermetallic compound, and thickness≤2 μm.
Further, in the hot continuous rolling step, control finishing temperature be 800~880 DEG C, total reduction be 60~
95%, coiling temperature is 700~730 DEG C.
Further, in the cold continuous rolling step, it is 55~75% to control total reduction.
The mechanism and function analysis of each element are as follows in steel of the present invention：
C：Carbon can stable austenite phase, thus reduction Ac3 points reduce hot-forming temperature, reduce energy resource consumption, carbon atom exists
Gap solution strengthening effect is played in martensite, the reinforcing effect to martensite is first much larger than itself and displacement solid solution strengthened alloy
Element, but because thermoformed part is required for being assembled to body of a motor car with the mode of spot welding, in order to meet good welding performance, carbon
Content is defined to 0.2~0.8%.
Si：Silicon is solution strengthening element, thus it is possible to vary austenite transformation temperature, can also suppress cementite precipitation, stable
Austenite, but too high silicon can make the oxide-film of surface of steel plate be difficult to remove, and therefore, silicone content is defined to 0.08~0.6%；
Mn：Manganese is to improve the most frequently used alloying element of quenching degree, makes crack sensitivity due to welding the appearance of hardened layer
Increase, while punching performance is reduced, in order to ensure higher punching performance and welding performance, limit manganese content as 1.5~
5.0%, preferred content is 1.8~3.8%.
Al:Aluminium plays deoxidation in steel, and should ensure that in steel has a certain amount of dissolved aluminum, otherwise can not play its effect,
But excessive aluminium also can be mingled with generation aluminium system in steel, and be unfavorable for the smelting and casting of steel, meanwhile, appropriate aluminium is added in steel
The adverse effect of nitrogen in steel, oxygen atom to performance can be eliminated.Therefore, aluminium content is limited to less than 0.08%.
N:Nitrogen can combine to form titanium nitride in the steel for add titanium with titanium, it is this separate out at high temperature second be mutually conducive to it is strong
Change matrix, and improve the welding performance of steel plate, but nitrogen content, higher than 0.005%, the solubility product of nitrogen and titanium is higher, in high temperature
The thick titanium nitride of particle, the plasticity and toughness of serious infringement steel are formed, in addition, higher nitrogen content need to increase corresponding micro- conjunction
Gold element, so as to increase cost.Therefore, by Control of Nitrogen Content below 0.005%.
B：Minimal amount of boron is added in thermoforming steel to be gathered at austenite grain boundary, postpone ferrite forming core, from rather than
Often effectively prevent from shifting and ferrite is formed in forming process, therefore, limit Boron contents as 0.002~0.01%.
Cr：Chromium more effectively improves the quenching degree of steel than manganese, and it is 0.1~0.8% preferably to add content.
Ti, Nb and V：Refined crystalline strengthening and precipitation strength effect are primarily served, Ti+Nb+V contents are no more than 0.2%.
Al in plating solution：When Al content is less than 1.5% in coating, the corrosion proof effect of raising is not notable, and Al content is higher than
Bottom ash increase when 20%.Aluminium content is limited as 1.5~20%, preferred content is 1.5~7%.
Mg in plating solution：When Mg contents are less than 1.3% in coating, the corrosion proof effect of raising is not notable, and Mg contents are higher than 7%
When, top slag increase.Al/Mg<When 1, scum silica frost is more, and coating surface quality declines.Content of magnesium is limited as 1.5~7%, and Al/Mg
≥1。
Zn in plating solution：In plating solution in addition to alloy Al, Mg, remaining is Zn and inevitable impurity.
Compared with prior art, the present invention has advantages below：
First, the hot forming produced by the present invention strong zinc-aluminum-magnesium clad steel sheet of superelevation, after substrate hot forming is met
On the premise of tensile strength >=1700MPa, elongation after fracture >=5%, coating is continuous whole after being heated at high temperature punch forming, nothing
Extend to the crackle of matrix.
Second, Zn contents are integrally higher than 30% in coating alloy phase, coating corrosion resistance is excellent.
Third, steel of the present invention can meet corrosion-proof and high-strength degree Automobile Plate lightweight demand.
Brief description of the drawings
Fig. 1 is the coating morphology figure before ZAM1 thermoformings.
Fig. 2 is the coating morphology figure before ZAM2 coating thermoformings.
Fig. 3 is the coating morphology figure before ZAM3 thermoformings.
Fig. 4 is coating morphology figure after ZAM3 thermoformings.
Embodiment
With reference to specific embodiments and the drawings, the present invention is described in further detail, is easy to more clearly understand this
Invention, but they do not constitute restriction to the present invention.
Embodiment 1
A kind of hot forming strong zinc-aluminum-magnesium clad steel sheet of superelevation, its component and percentage by weight are：C：0.25%, Si：
0.25%, Mn：2.35%, Cr：0.4%, B：0.0024%, Ti：0.037%, Nb：0.025%, Al：0.06%, N：
0.0028%, remaining is Fe and inevitable impurity.The chemical component weight percentage of plating solution is：Al:2.4%, Mg:1.3%,
Remaining is Zn and inevitable impurity.
Clad steel sheet production stage is as follows：
1) smelted according to chemical composition and be casting continuously to form base；
2) 880 DEG C of finishing temperature of hot continuous rolling control, total reduction 90%, 710 DEG C of coiling temperature；
3) cold continuous rolling control total reduction 65%；
4) dew point by steel band at -30 DEG C is heated to 820 DEG C, in H2Percentage by volume is 30% reducing atmosphere
Under, 495 DEG C are cooled to 20 DEG C/s cooling rate, soaking time 30s is subsequently dipped in plating solution, bath temperature is 455 DEG C, leaching
Plating time 5s, is finally cooled to room temperature with 30 DEG C/s cooling rate and coil of strip is made；To be distinguished with other embodiments, coating is determined here
Justice is ZAM1.
5) by the coil of strip blanking after plating into slab, 890 DEG C of complete austenitizings are heated to, insulation 10min carries out high temperature punching
Pressing formation, room temperature is cooled to 30 DEG C/s cooling rate.
Tissue of the coating before thermoforming is as shown in figure 1, there are three kinds of visibly different tissues in coating surface：Thick
Zn/Al eutectic structures, tiny densely covered Zn/Al/Zn2The mellow and full pure Zn particles of Mg ternary eutectics tissue and bright corner.Steel
Plate is after hot forming, and the complete nothing of coating comes off.The obtained strong high-temperature molding of superelevation is with after zinc-aluminum-magnesium clad steel sheet thermoforming
Mechanical property and quality of coating see the table below 1.
Embodiment 2
A kind of hot forming strong zinc-aluminum-magnesium clad steel sheet of superelevation, its component and percentage by weight are：C：0.35%, Si：
0.25%, Mn：2.35%, Cr：0.4%, B：0.0041%, Ti：0.045%, Nb：0.034%, Al：0.034%, N：
0.0035%, remaining is Fe and inevitable impurity.The chemical component weight percentage of plating solution is：Al:7.1%, Mg:1.6%,
Remaining is Zn and inevitable impurity.
Clad steel sheet production stage is as follows：
1) smelted according to chemical composition and be casting continuously to form base；
2) 800 DEG C of finishing temperature of hot continuous rolling control, total reduction 80%, 700 DEG C of coiling temperature；
3) cold continuous rolling control total reduction 55%；
4) dew point by steel band at 10 DEG C is heated to 780 DEG C, H2Percentage by volume is 20%, with 30 DEG C/s cooling rate
475 DEG C are cooled to, soaking time 50s is subsequently dipped in plating solution, 460 DEG C of bath temperature, immersion plating time 11s, with 45 DEG C/s's
Cooling rate is cooled to room temperature and coil of strip is made.To be distinguished with other embodiments, coating is defined as ZAM2 here.
5) 910 DEG C are heated to by the coil of strip blanking after plating into slab, insulation 8min carries out Hot stamping, with 20 DEG C/
S cooling rate is cooled to room temperature.
Tissue of the coating before thermoforming is as shown in Fig. 2 the distribution of three kinds of phases is similar with Fig. 1, it can be seen that size is obvious
It is bigger than ZAM1.Steel plate is after hot forming, and the complete nothing of coating comes off.Obtained superelevation strong high-temperature molding zinc-aluminum-magnesium clad steel sheet
Mechanical property and quality of coating after thermoforming see the table below 1.
Embodiment 3
A kind of hot forming strong zinc-aluminum-magnesium clad steel sheet of superelevation, its component and percentage by weight are：C：0.53%, Si：
0.35%, Mn：2.8%, Cr：0.4%, B：0.0055%, Ti：0.063%, V：0.1%, Al：0.051%, N：0.0049%,
Remaining is Fe and inevitable impurity.The chemical component weight percentage of plating solution is：Al:15.3%, Mg:3.7%, remaining is Zn
With inevitable impurity.
Production stage is as follows：
1) smelted according to chemical composition and be casting continuously to form base；
2) 840 DEG C of finishing temperature of hot continuous rolling control, total reduction 95%, 730 DEG C of coiling temperature；
3) cold continuous rolling control total reduction 75%；
4) dew point by steel band at 30 DEG C is heated to 840 DEG C, H2Percentage by volume is 10%, with 15 DEG C/s cooling rate
465 DEG C are cooled to, soaking time 90s is subsequently dipped in plating solution, 465 DEG C of bath temperature, immersion plating time 15s, with 50 DEG C/s's
Cooling rate is cooled to room temperature and coil of strip is made.To be distinguished with other embodiments, coating is defined as ZAM3 here.
5) 930 DEG C are heated to by the coil of strip blanking after plating into slab, insulation 5min carries out Hot stamping, with 10 DEG C/
S cooling rate is cooled to room temperature.
Tissue of the coating before thermoforming is as shown in figure 3, the distribution of three kinds of phases is similar with Fig. 2, it can be seen that thick tissue
Size further increases.Tissue topography after complete austenitizing is hot press-formed is as shown in figure 4, coating is before being molded
Three kinds are mutually changed into homogeneous phase, and the percentage by weight of each alloying element is in the middle part of energy spectrum analysis coating：Mg is that 1.05%, Al is
2.61%, Fe are that 59.05%, Zn is 37.29%.Steel plate is after hot forming, and the complete nothing of coating comes off.Entirety Zn contains in coating
Amount is higher than 30%, and antiseptic property is good.Obtained mechanical property of the superelevation strong high-temperature molding after zinc-aluminum-magnesium clad steel sheet thermoforming
Energy and quality of coating see the table below 1.
The mechanics of obtained superelevation strong high-temperature molding zinc-aluminum-magnesium clad steel sheet (after thermoforming) in above-described embodiment 1~3
Performance and quality of coating are as shown in table 1 below.
Table 1
Superelevation strong hot forming zinc-aluminum-magnesium clad steel sheet produced by the present invention, hot forming it can be seen from the data of table 1
Tensile strength >=1710MPa afterwards, elongation after fracture >=5.3%, coating is continuous whole, meets corrosion-proof and high-strength degree automobile component steel
It is required that.
Claims (9)
1. a kind of high-temperature molding strong zinc-aluminum-magnesium clad steel sheet of superelevation, it is characterised in that：Steel plate include following chemical composition and its
Percetage by weight：C：0.2~0.8%, Si：0.08~0.6%, Mn：1.5~5.0%, Al≤0.08%, N≤0.005%, its
Remaining is Fe and inevitable impurity；Coating includes following chemical composition and its percetage by weight with plating solution：Al：1.5~20%,
Mg：1.3~7%, remaining is Zn and inevitable impurity.
2. the high-temperature molding according to claim 1 strong zinc-aluminum-magnesium clad steel sheet of superelevation, it is characterised in that：Steel plate include with
Lower chemical composition and its percetage by weight：C：0.25~0.53%, Si：0.25~0.35%, Mn：2.35~2.8%, Al：
0.034~0.06%, N：0.0028~0.0049%, remaining is Fe and inevitable impurity.
3. the high-temperature molding according to claim 1 strong zinc-aluminum-magnesium clad steel sheet of superelevation, it is characterised in that：Steel plate also includes
Following chemical composition and its percetage by weight：Cr：0.1~2.0%, B：One in 0.001~0.05%, and following three kinds of elements
Plant or several：Ti：0.01~1.0%, Nb：0.01~0.1%, V：0.01~0.1%.
4. the high-temperature molding strong zinc-aluminum-magnesium clad steel sheet of superelevation according to claim 1 or 2 or 3, it is characterised in that：Coating
Include following chemical composition and its percetage by weight with plating solution：Al：1.5~7%, Mg：1.3~7%, and Al/Mg >=1, remaining
For Zn and inevitable impurity.
5. the high-temperature molding strong zinc-aluminum-magnesium clad steel sheet of superelevation according to claim 1 or 2 or 3, it is characterised in that：Steel plate
Base steel tissue include percentage by volume be 95~100% martensite.
6. a kind of high-temperature molding according to claim 1 manufacture method of the strong zinc-aluminum-magnesium clad steel sheet of superelevation, includes successively
Smelting step, continuous casting step, hot continuous rolling step, cold continuous rolling step, hot-dip step, finishing step, hot forming step, it is special
Levy and be：In the hot-dip step, steel band is heated to 780~840 DEG C in -60~30 DEG C of dew point, then 1
The H of ＜ percentage by volume≤30%2Under atmosphere, 445~510 DEG C are cooled to 10~30 DEG C/s cooling velocity, insulation 0~
100s, subsequent immersion plating is into plating solution, and bath temperature is 440~480 DEG C, is finally cooled to room temperature with cooling velocity >=30 DEG C/s；
In the hot forming step, by heating of plate blank to complete austenitizing, it is incubated after 1~10min and carries out high temperature punch forming, and
Room temperature is cooled to 10~30 DEG C/s cooling velocity.
7. the manufacture method of the high-temperature molding strong zinc-aluminum-magnesium clad steel sheet of superelevation according to claim 6, it is characterised in that：Steel
Plate coating surface before hot forming includes three kinds of tissues：Zn/Al eutectic structures, Zn/Al/Zn2Mg ternary eutectics tissue and pure
Zn particles；Zn/Al/Zn2Piece interlamellar spacing≤1 μm of Mg ternary eutectic tissues；By ferro-aluminum or ferro-aluminum zinc gold between base steel and coating
Compound is constituted between category, and thickness≤2 μm.
8. the manufacture method of the high-temperature molding strong zinc-aluminum-magnesium clad steel sheet of superelevation according to claim 6 or 7, its feature exists
In：In the hot continuous rolling step, it is 800~880 DEG C to control finishing temperature, and total reduction is 60~95%, and coiling temperature is 700
~730 DEG C.
9. the manufacture method of the high-temperature molding strong zinc-aluminum-magnesium clad steel sheet of superelevation according to claim 6 or 7, its feature exists
In：In the cold continuous rolling step, it is 55~75% to control total reduction.
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