CN103911551A - Hot-dipped aluminum-zinc alloy steel plate and preparation method thereof - Google Patents
Hot-dipped aluminum-zinc alloy steel plate and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a hot-dipped aluminum-zinc alloy steel plate. The hot-dipped aluminum-zinc alloy steel plate comprises a steel plate base material and an aluminum-zinc alloy clad layer which is arranged on the surface of the steel plate base material, wherein the steel plate base material contains the following ingredients by adopting the total weight of the steel plate base material as a benchmark: 0.01 to 0.039 percent by weight of C, 0.15 to 0.19 percent by weight of Mn, less than 0.015 percent by weight of P, 0.02 to 0.07 percent by weight of Al, 0.005 to 0.025 percent by weight of Ti, less than 0.05 percent by weight of Si, less than 0.015 percent by weight of S, 99.59 to 99.8 percent by weight of Fe and the balance of unavoidable impurities. The invention also discloses a preparation method of the hot-dipped aluminum-zinc alloy steel plate. By adopting the preparation method, the yield strength of the prepared hot-dipped aluminum-zinc alloy steel plate is maintained at 250MPa to 310MPa, the tensile strength is 300MPa to 380MPa, the surface quality is good, and the forming performance is high.
Description
Technical field
The present invention relates to a kind of hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof.
Background technology
In recent years, along with the development rapidly of science and technology, hot-dip coating aluminium-zinc alloy steel plate range of application is all the more extensive, and the hot-dip coating aluminium-zinc alloy plate that wherein electrical control cubicles is used is meeting under the condition of certain intensity, is more tending towards to good surface quality, the higher development such as forming property, welding property.But the carbon aluminium-killed steel hot-dip coating aluminium-zinc alloy plate in the scope that keeps 250-310MPa yield strength, 350-380MPa tensile strength is difficult to reach good surface quality and higher forming property, is particularly difficult to obtain being greater than 30% unit elongation.
Therefore, be badly in need of a kind ofly can reaching hot-dip coating aluminium-zinc alloy plate some strength, surface quality good (thickness of coating is thin, zinc is spent evenly, densification) and higher forming property (unit elongation is greater than 30%).
Summary of the invention
The object of this invention is to provide hot-dip coating aluminium-zinc alloy plate that surface quality is good and forming property is high in a kind of scope keeping 250-310MPa yield strength, 300-380MPa tensile strength and preparation method thereof.
To achieve these goals, the invention provides a kind of hot-dip coating aluminium-zinc alloy steel plate, this hot-dip coating aluminium-zinc alloy steel plate comprises substrate of steel plate and is positioned at the al-zn alloy coating on substrate of steel plate surface, wherein, take the gross weight of substrate of steel plate as benchmark, the C that this substrate of steel plate contains 0.01-0.039 % by weight, the Mn of 0.15-0.19 % by weight, P below 0.015 % by weight, the Al of 0.02-0.07 % by weight, the Ti of 0.005-0.025 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, the Fe of 99.59-99.8 % by weight, surplus is inevitable impurity.
The present invention also provides a kind of preparation method of hot-dip coating aluminium-zinc alloy steel plate, wherein, the method comprises casts slab by molten steel, gained slab is carried out to hot rolling successively, cold rolling, cleaning by degreasing, annealing, hot dip aluminum plating zinc alloy and purging, take the gross weight of slab as benchmark, the C that this slab contains 0.01-0.039 % by weight, the Mn of 0.15-0.19 % by weight, P below 0.015 % by weight, the Al of 0.02-0.07 % by weight, the Ti of 0.005-0.025 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, 99.59-99.8 the Fe of % by weight, surplus is inevitable impurity.
According to the preparation method of hot-dip coating aluminium-zinc alloy steel plate of the present invention, can obtain yield strength is 250-310MPa, tensile strength is 300-380MPa, and unit elongation is higher than 30%, surperficial group of product reach the great surface quality of FC level and high formability can hot-dip coating aluminium-zinc alloy steel plate.
In addition the hot-dip coating aluminium-zinc alloy steel plate obtaining by method of the present invention, also has advantages of that weldability is good.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that makes of embodiment 1.
Fig. 2 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that makes of embodiment 4.
Fig. 3 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that makes of embodiment 5.
Fig. 4 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that makes of embodiment 6.
Fig. 5 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that makes of embodiment 7.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
The invention provides a kind of hot-dip coating aluminium-zinc alloy steel plate, this hot-dip coating aluminium-zinc alloy steel plate comprises substrate of steel plate and is positioned at the al-zn alloy coating on substrate of steel plate surface, wherein, take the gross weight of substrate of steel plate as benchmark, the C that this substrate of steel plate contains 0.01-0.039 % by weight, the Mn of 0.15-0.19 % by weight, P below 0.015 % by weight, the Al of 0.02-0.07 % by weight, the Ti of 0.005-0.025 % by weight, the Si below 0.05 % by weight, the S below 0.015 % by weight, 99.59-99.8 the Fe of % by weight, surplus is inevitable impurity.
According to the present invention, as long as the content of the moiety of substrate of steel plate is controlled in above-mentioned scope, just can obtain yield strength is 250-310MPa, tensile strength is 300-380MPa and unit elongation higher than 30% substrate of steel plate, but under preferable case, take the gross weight of substrate of steel plate as benchmark, the C that this substrate of steel plate contains 0.015-0.03 % by weight, the Mn of 0.15-0.19 % by weight, the P of 0.005-0.015 % by weight, the Al of 0.03-0.06 % by weight, the Ti of 0.01-0.015 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, 99.63-99.79 the Fe of % by weight, surplus is inevitable impurity.More preferably, take the gross weight of substrate of steel plate as benchmark, the C that this substrate of steel plate contains 0.02-0.03 % by weight, the Mn of 0.15-0.19 % by weight, the P of 0.012-0.015 % by weight, the Al of 0.044-0.05 % by weight, the Ti of 0.01-0.014 % by weight, the Si of 0.01-0.02 % by weight, the S of 0.009-0.014 % by weight, 99.67-99.74 the Fe of % by weight, surplus is inevitable impurity.
According to the present invention, in described substrate of steel plate, contain the P below 0.015 % by weight.By phosphorus is controlled within the scope of this, can keep substrate of steel plate to reach certain intensity, the content of preferred described phosphorus is controlled within the scope of 0.005-0.015 % by weight, more preferably within the scope of 0.012-0.015 % by weight.
In the present invention, the titanium (Ti) of trace be mainly that effect is that nitrogen in fixing steel forms TiN, TiN has the effect of crystal grain thinning; And Ti can also separate out TiC in annealing process, TiC has precipitation strength effect.But titanium content is too much, it is saturated that its strengthening effect also can be tending towards.Therefore, in pot galvanize aluminium alloy steel plate of the present invention, titanium content is controlled within the scope of 0.005-0.025 % by weight, preferably within the scope of 0.01-0.015 % by weight, more preferably within the scope of 0.01-0.014 % by weight.The present invention is by suitably keeping the content of the titanium in substrate of steel plate, thereby can suitably reduce adding of other strengthening elements, such as Mn, C etc., thus in guaranteeing to obtain high-intensity substrate of steel plate, simplify technique, and reduced production cost.
In addition, in smelting iron and steel, the Ti of superfluous solid solution and P there will be FeTiP precipitation precipitation phenomenon, cause age hardening.The present invention, by the P in molten steel and Ti are controlled in above-mentioned scope, can avoid this phenomenon, makes the precipitation strength of Ti and the solution strengthening of P realize independently simultaneously simultaneously.
In the present invention, carbon (C) is the important element that affects plate property, and in the time that carbon content increases, armor plate strength improves, but forming property and welding property reduce.Operability and the economy of process for making mainly considered in the selection of described carbon content scope, and the over-all properties of product, if carbon content is lower than 0.01 % by weight, when steel-making, must carry out vacuum-treat, increase production cost, if carbon content exceedes 0.039 % by weight, not only increase because recarburization practice makes the production cost of steel-making, and the Plasticity Decreasing of steel plate, welding property worsens simultaneously.Therefore, the content of the C in pot galvanize aluminium alloy steel plate of the present invention is 0.01-0.039 % by weight, is preferably 0.015-0.03 % by weight, more preferably 0.02-0.03 % by weight.
In the present invention, manganese (Mn) is solution strengthening element, increases manganese content and can improve intensity, and Mn can also be combined into MnS with sulphur (S) simultaneously, prevents that S from producing thermal crack because forming FeS.But the present invention, for guaranteeing spot welding characteristics, is controlled at 0.15-0.19 % by weight by manganese content.
In the present invention, add the object of aluminium (Al) to mainly contain two, one is the oxygen removing in steel, avoids forming non-metallic inclusion in process of setting, and it two is with the nitrogen in the fixing steel of the form of aluminium nitride (AlN).But too high aluminium will affect welding property and the coating adhesion and uneconomical of steel, therefore, in pot galvanize aluminium alloy steel plate of the present invention, aluminium content is controlled within the scope of 0.02-0.07 % by weight, preferably in the scope of 0.03-0.06 % by weight, more preferably within the scope of 0.044-0.05 % by weight.
Conventionally, silicon (Si) and sulphur (S) are as inevitable impurity and residual existence, wherein too high silicone content, after thermal treatment, the enrichment of surface of steel plate silicon is obvious, affect the platability of steel plate, cause surface of steel plate plating leakage point defect, affect solidity to corrosion and the surface quality of steel plate; Too high sulphur can produce adverse influence to the plasticity of steel plate, easily causes hot-short.Therefore, the present invention considers the economy of steel making working procedure and the effect that Ca processes, and the content of Si is limited to below 0.05 % by weight, and the content of S is limited to below 0.015 % by weight; Preferably, the content of Si is limited within the scope of 0.01-0.02, and the content of S is limited within the scope of 0.009-0.014 % by weight.
According to the present invention, adopt above-mentioned substrate of steel plate, the described hot-dip coating aluminium-zinc alloy steel plate that just can obtain the al-zn alloy coating of high surface quality, there is no particular limitation for the composition to al-zn alloy coating and thickness, can adopt conventional al-zn alloy coating composition and thickness.But under preferable case, in order to take into account coating corrosion resistance nature and spot welding characteristics, in hot-dip coating aluminium-zinc alloy steel plate provided by the invention, with respect to the substrate of steel plate of every square metre, the weight of described al-zn alloy coating is 50-150g.The weight of described al-zn alloy coating is the gross weight of two sides al-zn alloy coating.Aluminium-zinc alloy described in the present invention can be the aluminium-zinc alloy of component content known in the field, for example can be take the gross weight of al-zn alloy coating as benchmark, in described al-zn alloy coating, the content of aluminium can be 55-65 % by weight, the content of zinc can be 35-45 % by weight, and the content of silicon is 1-3 % by weight.Under preferable case, take the gross weight of al-zn alloy coating as benchmark, in described al-zn alloy coating, the content of aluminium is 55-60 % by weight, and the content of zinc is 40-45 % by weight, and the content of silicon is 1-2 % by weight.The more preferably aluminium-zinc alloy of 55 % by weight Al-43.5 % by weight Zn-1.5 % by weight Si.
The present invention also provides the preparation method of above-mentioned hot-dip coating aluminium-zinc alloy steel plate, wherein, the method comprises casts slab by molten steel, gained slab is carried out to hot rolling successively, cold rolling, cleaning by degreasing, annealing, hot dip aluminum plating zinc alloy and air knife purge, take the gross weight of slab as benchmark, the C that this slab contains 0.01-0.039 % by weight, the Mn of 0.15-0.19 % by weight, P below 0.015 % by weight, the Al of 0.02-0.07 % by weight, the Ti of 0.005-0.025 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, 99.59-99.8 the Fe of % by weight, surplus is inevitable impurity.
Preferably, take the gross weight of slab as benchmark, the C that this slab contains 0.015-0.03 % by weight, the Mn of 0.15-0.19 % by weight, the P of 0.005-0.01 % by weight, the Al of 0.03-0.06 % by weight, the Ti of 0.01-0.015 % by weight, the Si below 0.05 % by weight, the S below 0.015 % by weight, 99.63-99.79 the Fe of % by weight, surplus is inevitable impurity.
More preferably, take the gross weight of slab as benchmark, the C that this slab contains 0.02-0.03 % by weight, the Mn of 0.15-0.19 % by weight, the P of 0.012-0.015 % by weight, the Al of 0.044-0.05 % by weight, the Ti of 0.01-0.014 % by weight, the Si of 0.01-0.02 % by weight, the S of 0.009-0.014 % by weight, 99.67-99.74 the Fe of % by weight, surplus is inevitable impurity.
In addition, the method that molten steel of the present invention is cast slab is the method for this area routine, can smelt and the condition of casting obtains above-mentioned slab by control.The method of described casting can be die casting or continuous casting, and actual conditions has been conventionally known to one of skill in the art, and the present invention does not repeat them here.
According to the present invention, hot rolling to described slab and cold rolling condition do not have concrete restriction, for obtain some strength and compared with high formability can and smooth steel plate, under preferable case, the condition of described hot rolling comprises: hot fine rolling temperature in is 900-1050 ℃, finishing temperature is 850-900 ℃, and coiling temperature is 700-750 ℃; Described cold rolling condition comprises: cold rolling total reduction is 60-80%.
According to the present invention, there is surface uniform in order to obtain, the steel plate of aluminium-zinc coating attractive in appearance, need to affect the impurity of plate surface quality to remove surperficial greasy dirt, iron scale, iron powder etc. to carrying out cleaning by degreasing through above-mentioned steel plate after treatment.Described cleaning by degreasing preferably includes alkali cleaning and electrolytic cleaning.The condition control of described alkali cleaning and electrolytic cleaning will directly have influence on the quality of surface of steel plate, if clean thoroughly not, will affect the homogeneity etc. of aluminium-zinc coating of gained.In the present invention, the condition of preferred described alkali cleaning comprises: the free alkalinity of scavenging solution is 65-80Pt, and temperature is 70-85 ℃, and the time is 5-60s; More preferably, the condition of described alkali cleaning comprises: the free alkalinity of scavenging solution is 70-72Pt, and temperature is 80-83 ℃, and the time is 5-60s.The condition of preferred described electrolytic cleaning comprises: the free alkalinity of scavenging solution is 65-80Pt, and temperature is 70-90 ℃, and electric current is 6500-7500A, and the time is 5-60s; More preferably the condition of described electrolytic cleaning comprises: the free alkalinity of scavenging solution is 70-72Pt, and temperature is 80-83 ℃, and electric current is 6800-7000A, and the time is 5-60s.Wherein, free alkalinity refers to the gross weight of contained OH-ion in water, for example, can adopt the new clean-out system of interpolation to regulate.When free alkalinity is during lower than 65Pt, can not fully clean belt steel surface Residual oil, iron scale, iron powder, affect strip surface quality; Waste degreasing fluid during higher than 80Pt when free alkalinity, increase production cost.In addition, described cleaning by degreasing duration used can decide according to the situation of the foreign matter content of concrete surface of steel plate, and for example, carry out cleaning by degreasing in Continuous Hot Dip Galvanizing time, unit transmits with the speed of 60-120m/min.
According to the present invention, annealing process is larger for the impact of the intensity of steel, in order to obtain the steel plate of 250-310MPa yield strength, 350-380MPa tensile strength, while particularly producing thin brilliant steel plate, need to strictly control annealing temperature and unit speed.Preferably, the condition of described annealing comprises: temperature is 690-800 ℃, and the time is 30-70s; More preferably, the condition of described annealing comprises: temperature is 760-800 ℃, and the time is 35-50s.If annealing temperature, made the recrystallize of steel plate incomplete, thereby also has deformed microstructure in steel plate lower than 30s lower than 690 ℃ or time, cause intensity extremely high, plasticity is poor; If annealing temperature is greater than 70s higher than 800 ℃ or time, recrystal grain alligatoring, can not get tiny uniform recrystallized structure, and gained intensity is lower.
According to the present invention, described hot dip aluminum plating zinc alloy can adopt continous way hot dipping method, also can adopt intermittent type hot dipping method, but in order to boost productivity and lumber recovery, the present invention preferably adopts continous way hot dipping method.In zinc pot after melting, control above-mentioned aluminium-zinc alloy the condition of plate golding aluminium zinc alloy well, above-mentioned steel plate is conveyed in zinc pot.The condition of the preferred described hot dip aluminum plating zinc alloy of the present invention comprises: bath temperature is 585-610 ℃, and entering zinc pot front spring temperature is 575-590 ℃.If bath temperature is lower than 585 ℃, flow of the electrolyte is poor, affects platability; If bath temperature is higher than 610 ℃, it is fierce that plating solution reacts with steel plate, makes alloy layer increase layer, reduces the bonding force of coating.If the temperature of steel plate is lower than 575 ℃ or higher than 590 ℃ when steel plate enters zinc pot, all easily cause steel plate bath temperature fluctuation around, reduce platability.There is no particular limitation in the present invention, steel plate to be entered to the speed of zinc pot, as long as can make the steel plate with respect to every square metre, the weight of described al-zn alloy coating is that 50-150g gets final product (weight of described al-zn alloy coating is the gross weight of two sides al-zn alloy coating).For example, adopt VAI method continuously dip coat unit, transmit with the transfer rate of 60-120m/min.
According to the present invention, need to purge the aluminium-zinc alloy melt on steel plate out from zinc pot, make the al-zn alloy coating on steel plate distribute more evenly, preferably adopt air knife to purge.The condition optimization that described air knife purges comprises: pressure 12-30KPa is highly 250-350mm, is 23-30mm apart from the vertical range of steel plate; More preferably, the condition that described air knife purges comprises: pressure 18-20KPa is highly 300-350mm, is 26-28mm apart from the vertical range of steel plate.This air knife is preferably placed at zinc pot top, so just can take the dish out of the pot and start to purge at steel plate.Described height refers to the height of air knife apart from melt liquid level in zinc pot, air knife apart from the vertical range of steel plate be take the dish out of the pot after the air knife distance nearest apart from steel plate.Air knife height and apart from the vertical range of steel plate and purge pressure unmatched, all affects coating uniformity, is prone to the surface imperfection such as zinc flow liner, zinc scar, zinc fluctuating.
According to the present invention, the steel plate after plate golding aluminium zinc alloy is carried out cooling, the method that can adopt wind to sweep.The condition that cooling wind is swept is not particularly limited, as long as can make coating fast cooling and can with steel plate fully in conjunction with, for example can adopt Mobile fan to carry out wind sweeps, it moves air quantity is 10600-34450 square m/h, and coordinates mutually with steel plate operating rate and steel plate thickness.Wherein, if mobile air quantity is less than 10600 squares ms/h, may cause the zinc liquid can not rapid solidification, zinc be spent thick inhomogeneous, affects attractive in appearance and corrosion resistance of surface; If mobile air quantity is higher than 34450 squares ms/h, plating solution is not fully combined with substrate, also makes zinc spend inequality simultaneously.
According to the present invention, be controlled in the scope of the invention described above by enter zinc pot temperature, bath temperature and the air knife control parameter that make steel plate, can prevent plating leakage, zinc is spent the surface imperfection such as inequality, groove seal.
According to the present invention, the preparation method of described hot-dip coating aluminium-zinc alloy steel plate conventionally also comprises the steel plate of gained is carried out to polishing and straightening.Described polishing and straightening are the method for this area routine, and it is 0.3-0.5% that the polishing preferably adopting and straightening make described polishing unit elongation, and described straightening unit elongation is 0.4-0.6%.For example, described polishing adopts rolling load master mode, and rolling load is 150t.Described straightening for example can adopt six roller drawing and straightening machines.
According to the present invention, the preparation method of described hot-dip coating aluminium-zinc alloy steel plate conventionally also comprises the steel plate of gained carried out to passivation, and the present invention preferably adopts chromium-free deactivation.Method to described passivation is not particularly limited, and can be the passivating method of this area routine.Preferably, described passivation, for adopting environmental protection chromium-free passivation liquid, is carried out surface treatment by roll coating model to band steel, and the condition of described passivation comprises: roller coat coating is 130:70 with the roller speed ratio that dips in liquid roller, top roll roll-in is 50-110daN, and lower roll roll-in is 70-140daN.Under this condition, can guarantee that uniform film thickness is stable, there is no obvious aberration.
By above-mentioned preparation method, can prepare yield strength is 250-310MPa, and tensile strength is 300-380MPa, and unit elongation is higher than 30%, and surperficial group of product reach the high formability energy of FC level and the hot-dip coating aluminium-zinc alloy steel plate of great surface quality.
Below will describe the present invention by embodiment.
Embodiment 1-3
The present embodiment is used for illustrating hot-dip coating aluminium-zinc alloy steel plate of the present invention and preparation method thereof.
By obtaining by continuous metal cast process, steel bar plate (its composition is as shown in table 1) carries out hot rolling and cold rolling (the finish rolling start rolling temperature of hot rolling is 1000 ℃, and finishing temperature is 870 ℃, and coiling temperature is 720 ℃; Cold rolling draft is 70%) obtain cold-rolled steel sheet.In Continuous Hot Dip Galvanizing, think that the transfer rate of 100m/min carries out alkali cleaning, electrolytic cleaning, annealing and plate golding aluminium zinc alloy.Wherein, alkali cleaning condition is: free alkalinity is controlled at 72Pt, and temperature is 83 ℃; The condition of electrolytic cleaning is: free alkalinity is controlled at 72Pt, and temperature is 83 ℃, and Faradaic current is controlled at 7000A; The above-mentioned 35s that anneals at 760 ℃ that is annealed into; After annealing, send into zinc pot and carry out plate golding aluminium zinc alloy, the step of plate golding aluminium zinc alloy is: the temperature that enters the steel plate before zinc pot is 590 ℃, and the temperature of plating solution is 600 ℃; Zinc pot top adopts air knife to purge simultaneously, and the condition that air knife purges is: pressure 18KPa is highly 300mm, is 28mm apart from the vertical range of steel plate.After plating, carry out cooling mobile air quantity and be 28000 squares ms/h.Then, carry out polishing, straightening and chromium-free deactivation, wherein, polishing elongation control is 0.38%; Straightening unit elongation 0.4%; The condition of passivation comprises: roller coating machine is delivered to application roll by dipping in liquid roller by environment-friendly chromium-free passivating solution, then is rotated and be evenly coated in surface of steel plate by application roll.Roller coat application roll with dip in liquid roller roller speed ratio 135:68, top roll roll-in is 100daN, lower roll roll-in is 80daN.Obtain thus the hot-dip coating aluminium-zinc alloy plate of tiny uniform formation, excellent surface quality, high formability energy, see Fig. 1, wherein, with respect to the substrate of steel plate of every square metre, the weight of described al-zn alloy coating is 135g(two sides al-zn alloy coating).
Embodiment 4
According to the method in embodiment 1, different, alkali cleaning condition is: free alkalinity is controlled at 70Pt, and temperature is 80 ℃; The condition of electrolytic cleaning is: free alkalinity is controlled at 70Pt, and temperature is 80 ℃, and Faradaic current is controlled at 6800A, and gained hot-dip coating aluminium-zinc alloy steel plate is shown in Fig. 2.
Embodiment 5
According to the method in embodiment 1, different, be annealed into the 50s that anneals at 800 ℃, gained hot-dip coating aluminium-zinc alloy steel plate is shown in Fig. 3.
Embodiment 6
According to the method in embodiment 1, different, the condition that air knife purges is: pressure 20KPa is highly 350mm, is 26mm apart from the vertical range of steel plate, and gained hot-dip coating aluminium-zinc alloy steel plate is shown in Fig. 4.
Embodiment 7
Prepare hot-dip coating aluminium-zinc alloy steel plate according to the method in embodiment 1, difference is, annealing temperature is 670 ℃, and the composition of steel bar plate is as shown in table 1.Gained hot-dip coating aluminium-zinc alloy steel plate is shown in Fig. 5.
Comparative example 1
Prepare hot-dip coating aluminium-zinc alloy steel plate according to embodiment 1 method.Different, the composition of steel bar plate is as shown in table 1.
Comparative example 2
Prepare hot-dip coating aluminium-zinc alloy steel plate according to embodiment 1 method.Different, the composition of steel bar plate is as shown in table 1.
Test case 1
Adopt the method stipulating in GB/T228.1-2010 respectively the hot-dip coating aluminium-zinc alloy steel plate of embodiment 1-7 and comparative example 1-2 to be carried out to the test of yield strength, tensile strength, unit elongation, adopt the surface group product of the hot-dip coating aluminium-zinc alloy steel plate of the method stipulating in GB/T2518-2008 to embodiment 1-7 and comparative example 1-2 to judge, it the results are shown in Table 2.
Table 1
Table 2
| Numbering | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation (%) | Surface group product |
| Embodiment 1 | 299 | 374 | 32.5 | FC |
| Embodiment 2 | 284 | 367 | 37 | FC |
| Embodiment 3 | 301 | 375 | 32 | FC |
| Embodiment 4 | 305 | 389 | 32 | FC |
| Embodiment 5 | 308 | 382 | 34.5 | FC |
| Embodiment 6 | 277 | 365 | 35 | FC |
| Embodiment 7 | 353 | 390 | 25.5 | FC |
| Comparative example 1 | 370 | 412 | 23 | FC |
| Comparative example 2 | 362 | 398 | 28 | FC |
Data by table 1 and 2 can be found out, adopt the substrate of steel plate of composition of the present invention, can obtain yield strength is 250-310MPa, and tensile strength is 300-390MPa, and unit elongation is higher than 30%, and surperficial group of product reach the great surface quality of FC level and the hot-dip coating aluminium-zinc alloy steel plate of high formability energy.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out arbitrary combination between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (11)
1. a hot-dip coating aluminium-zinc alloy steel plate, this hot-dip coating aluminium-zinc alloy steel plate comprises substrate of steel plate and is positioned at the al-zn alloy coating on substrate of steel plate surface, it is characterized in that, take the gross weight of substrate of steel plate as benchmark, the C that this substrate of steel plate contains 0.01-0.039 % by weight, the Mn of 0.15-0.19 % by weight, P below 0.015 % by weight, the Al of 0.02-0.07 % by weight, the Ti of 0.005-0.025 % by weight, the Si below 0.05 % by weight, the S below 0.015 % by weight, 99.59-99.8 the Fe of % by weight, surplus is inevitable impurity.
2. hot-dip coating aluminium-zinc alloy steel plate according to claim 1, wherein, take the gross weight of substrate of steel plate as benchmark, the C that this substrate of steel plate contains 0.015-0.03 % by weight, the Mn of 0.15-0.19 % by weight, the P of 0.005-0.015 % by weight, the Al of 0.03-0.06 % by weight, the Ti of 0.01-0.015 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, the Fe of 99.63-99.79 % by weight, surplus is inevitable impurity.
3. hot-dip coating aluminium-zinc alloy steel plate according to claim 1, wherein, in described al-zn alloy coating, the content of aluminium is 55-65 % by weight, and the content of zinc is 35-45 % by weight, and the content of silicon is 1-3 % by weight.
4. according to the hot-dip coating aluminium-zinc alloy steel plate described in claim 1 or 3, wherein, with respect to the substrate of steel plate of every square metre, the weight of described al-zn alloy coating is 50-150g.
5. the preparation method of a hot-dip coating aluminium-zinc alloy steel plate, it is characterized in that, the method comprises casts slab by molten steel, gained slab is carried out to hot rolling successively, cold rolling, cleaning by degreasing, annealing, hot dip aluminum plating zinc alloy and purging, take the gross weight of slab as benchmark, the C that this slab contains 0.01-0.039 % by weight, the Mn of 0.15-0.19 % by weight, P below 0.015 % by weight, the Al of 0.02-0.07 % by weight, the Ti of 0.005-0.025 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, 99.59-99.8 the Fe of % by weight, surplus is inevitable impurity.
6. method according to claim 5, wherein, the condition of described hot rolling comprises: hot fine rolling temperature in is 900-1050 ℃, and finishing temperature is 850-900 ℃, and coiling temperature is 700-750 ℃; Described cold rolling condition comprises: cold rolling total reduction is 60-80%.
7. method according to claim 5, wherein, described cleaning by degreasing comprises alkali cleaning and electrolytic cleaning; The condition of described alkali cleaning comprises: the free alkalinity of scavenging solution is 65-80Pt, and temperature is 70-85 ℃; The condition of described electrolytic cleaning comprises: the free alkalinity of scavenging solution is 65-80Pt, and temperature is 70-90 ℃, and electric current is 6500-7500A.
8. method according to claim 5, wherein, the condition of described annealing comprises: temperature is 750-800 ℃, the time is 30-70s.
9. method according to claim 5, wherein, the condition of described hot dip aluminum plating zinc alloy comprises: bath temperature is 580-610 ℃, entering zinc pot front spring temperature is 575-590 ℃; The condition of this hot dip aluminum plating zinc alloy makes the steel plate with respect to every square metre, and the weight of described al-zn alloy coating is 50-150g.
10. method according to claim 5, wherein, described purging is that air knife purges, the condition that described air knife purges comprises: pressure 12-20KPa is highly 250-350mm, is 23-30mm apart from the vertical range of steel plate.
11. methods according to claim 5, wherein, the method also comprises that the steel plate after air knife is purged carries out polishing and straightening, and described polishing unit elongation is 0.3-0.5%, and described straightening unit elongation is 0.4-0.6%.
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| CN105970105A (en) * | 2016-06-08 | 2016-09-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-dip aluminum-zinc plate/strip used for highly deep drawing and preparation method thereof |
| CN106917041A (en) * | 2015-12-28 | 2017-07-04 | 上海梅山钢铁股份有限公司 | A kind of cold rolling hot-dip aluminizing zincium steel plate of think gauge and its manufacture method |
| CN107034416A (en) * | 2017-04-10 | 2017-08-11 | 攀钢集团研究院有限公司 | Hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof |
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| CN112437710A (en) * | 2018-06-22 | 2021-03-02 | 日本制铁株式会社 | Steel sheet, tailor welded blank, hot press-formed article, steel pipe, hollow quenched formed article, and method for producing same |
| CN109750146A (en) * | 2019-01-15 | 2019-05-14 | 象山华鹰塑料工程有限公司 | A kind of automotive window panel hot-dip aluminizing alloy-steel plate manufacturing process |
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