CN103911551B - A kind of hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof - Google Patents
A kind of hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof Download PDFInfo
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Abstract
The invention discloses 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, with the gross weight of substrate of steel plate for benchmark, this substrate of steel plate contains the C of 0.01-0.039 % by weight, the Mn of 0.15-0.19 % by weight, the P of less than 0.015 % by weight, the Al of 0.02-0.07 % by weight, the Ti of 0.005-0.025 % by weight, the Si of less than 0.05 % by weight, the S of less than 0.015 % by weight, 99.59-99.8 the Fe of % by weight, surplus is inevitable impurity.The invention also discloses by the preparation method of above-mentioned hot-dip coating aluminium-zinc alloy steel plate.Good and the hot-dip coating aluminium-zinc alloy steel plate that forming property is high of the surface quality that can be obtained in the scope keeping 250-310MPa yield strength, 300-380MPa tensile strength by method of the present invention.
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 wherein the hot-dip coating aluminium-zinc alloy plate of electrical control cubicles is under the condition meeting certain intensity, is more tending towards to development such as good surface quality, higher forming property, welding propertys.But the carbon aluminium-killed steel hot-dip coating aluminium-zinc alloy plate in the scope keeping 250-310MPa yield strength, 350-380MPa tensile strength is difficult to reach good surface quality and higher forming property, is particularly difficult to the unit elongation obtaining being greater than 30%.
Therefore, be badly in need of a kind of can reach some strength, surface quality good (thickness of coating is thin, zinc is spent evenly, fine and close) and the hot-dip coating aluminium-zinc alloy plate of higher forming property (unit elongation is greater than 30%).
Summary of the invention
The object of this invention is to provide the good and hot-dip coating aluminium-zinc alloy plate that forming property is high and preparation method thereof of surface quality in a kind of scope keeping 250-310MPa yield strength, 300-380MPa tensile strength.
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, with the gross weight of substrate of steel plate for benchmark, this substrate of steel plate contains the C of 0.01-0.039 % by weight, the Mn of 0.15-0.19 % by weight, the Ti of the Al of the P of less than 0.015 % by weight, 0.02-0.07 % by weight, 0.005-0.025 % by weight, the Si of less than 0.05 % by weight, the Fe of the S of less than 0.015 % by weight, 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 hot rolling successively, cold rolling, cleaning by degreasing, annealing, hot dip aluminum plating zinc alloy and purging, with the gross weight of slab for benchmark, this slab contains the C of 0.01-0.039 % by weight, the Mn of 0.15-0.19 % by weight, the P of less than 0.015 % by weight, the Al of 0.02-0.07 % by weight, the Ti of 0.005-0.025 % by weight, the Si of less than 0.05 % by weight, the S of less than 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%, 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.
In addition, the hot-dip coating aluminium-zinc alloy steel plate obtained by method of the present invention also has the good advantage of weldability.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is 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 embodiment 1 obtains.
Fig. 2 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that embodiment 4 obtains.
Fig. 3 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that embodiment 5 obtains.
Fig. 4 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that embodiment 6 obtains.
Fig. 5 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that embodiment 7 obtains.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of 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, with the gross weight of substrate of steel plate for benchmark, this substrate of steel plate contains the C of 0.01-0.039 % by weight, the Mn of 0.15-0.19 % by weight, the P of less than 0.015 % by weight, the Al of 0.02-0.07 % by weight, the Ti of 0.005-0.025 % by weight, the Si of less than 0.05 % by weight, the S of less than 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 make the content of the moiety of substrate of steel plate control in above-mentioned scope, just can obtain yield strength is 250-310MPa, tensile strength be 300-380MPa and unit elongation higher than 30% substrate of steel plate, but under preferable case, with the gross weight of substrate of steel plate for benchmark, this substrate of steel plate contains the C of 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, the Si of less than 0.05 % by weight, the S of less than 0.015 % by weight, 99.63-99.79 the Fe of % by weight, surplus is inevitable impurity.More preferably, with the gross weight of substrate of steel plate for benchmark, this substrate of steel plate contains the C of 0.02-0.03 % by weight, the P of the Mn of 0.15-0.19 % by weight, 0.012-0.015 % by weight, the Al of 0.044-0.05 % by weight, the S of the Si of the Ti of 0.01-0.014 % by weight, 0.01-0.02 % by weight, 0.009-0.014 % by weight, 99.67-99.74 the Fe of % by weight, surplus is inevitable impurity.
According to the present invention, containing the P of less than 0.015 % by weight in described substrate of steel plate.By controlling within the scope of this by phosphorus, can keep the intensity that substrate of steel plate reaches certain, the content of preferred described phosphorus controls in 0.005-0.015 % by weight scope, more preferably in 0.012-0.015 % by weight scope.
In the present invention, the mainly effect of the titanium (Ti) of trace is the effect that nitrogen in fixing steel forms that TiN, TiN have crystal grain thinning; And Ti can also separate out TiC in annealing process, TiC has precipitation strength effect.But titanium content is too much, and its strengthening effect also can be tending towards saturated.Therefore, in pot galvanize aluminium alloy steel plate of the present invention, titanium content controls in 0.005-0.025 % by weight scope, preferably in 0.01-0.015 % by weight scope, more preferably in 0.01-0.014 % by weight scope.The present invention by suitably keeping the content of the titanium in substrate of steel plate, thus can suitably reduce adding of other strengthening elements, such as Mn, C etc., thus while the substrate of steel plate ensureing acquisition high strength, simplifies technique, and reduce production cost.
In addition, in smelting iron and steel, Ti and the P of superfluous solid solution there will be FeTiP and precipitates precipitation phenomenon, causes age hardening.The present invention, by being controlled by P and Ti in molten steel, in above-mentioned scope, can avoid this phenomenon, makes the solution strengthening of the precipitation strength of Ti and P realize independently simultaneously simultaneously.
In the present invention, carbon (C) is the important element affecting plate property, and when carbon content increases, armor plate strength improves, but forming property and welding property reduce.Operability and the economy of process for making are 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, vacuum-treat must be carried out during steel-making, increase production cost, if carbon content is more than 0.039 % by weight, not only make because of recarburization practice the production cost of steel-making increase, and the plasticity of steel plate reduces, 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, is more preferably 0.02-0.03 % by weight.
In the present invention, manganese (Mn) is solution strengthening element, and increase Fe content and can improve intensity, Mn can also be combined into MnS with sulphur (S) simultaneously, prevents S from producing thermal crack because forming FeS.But Fe content, for ensureing spot welding characteristics, controls at 0.15-0.19 % by weight by the present invention.
In the present invention, the object adding aluminium (Al) mainly contains two, and one is the oxygen removed in steel, avoids forming non-metallic inclusion in process of setting, and it two is the nitrogen fixed with the form of aluminium nitride (AlN) in steel.But too high aluminium will affect the welding property of steel and coating adhesion and uneconomical, therefore, in pot galvanize aluminium alloy steel plate of the present invention, aluminium content controls in 0.02-0.07 % by weight scope, preferably in the scope of 0.03-0.06 % by weight, more preferably in 0.044-0.05 % by weight scope.
Usually, silicon (Si) and sulphur (S) remain existence as inevitable impurity, 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 of Ca process, the content of Si is limited to less than 0.05 % by weight, the content of S is limited to less than 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 in 0.009-0.014 % by weight scope.
According to the present invention, adopt above-mentioned substrate of steel plate, just can obtain the described hot-dip coating aluminium-zinc alloy steel plate of the al-zn alloy coating of high surface quality, to the composition of al-zn alloy coating and thickness, there is no particular limitation, 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, the substrate of steel plate relative to 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, such as can with the gross weight of al-zn alloy coating for 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, with the gross weight of al-zn alloy coating for 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.Be more preferably the aluminium-zinc alloy of 55 % by weight Al-43.5 % by weight Zn-1.5 % by weight Si.
Present invention also offers 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 hot rolling successively, cold rolling, cleaning by degreasing, annealing, hot dip aluminum plating zinc alloy and air knife purge, with the gross weight of slab for benchmark, this slab contains the C of 0.01-0.039 % by weight, the Mn of 0.15-0.19 % by weight, the P of less than 0.015 % by weight, the Al of 0.02-0.07 % by weight, the Ti of 0.005-0.025 % by weight, the Si of less than 0.05 % by weight, the S of less than 0.015 % by weight, 99.59-99.8 the Fe of % by weight, surplus is inevitable impurity.
Preferably, with the gross weight of slab for benchmark, this slab contains the C of 0.015-0.03 % by weight, the P of the Mn of 0.15-0.19 % by weight, 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 of less than 0.05 % by weight, the S of less than 0.015 % by weight, 99.63-99.79 the Fe of % by weight, surplus is inevitable impurity.
More preferably, with the gross weight of slab for benchmark, this slab contains the C of 0.02-0.03 % by weight, the P of the Mn of 0.15-0.19 % by weight, 0.012-0.015 % by weight, the Al of 0.044-0.05 % by weight, the S of the Si of the Ti of 0.01-0.014 % by weight, 0.01-0.02 % by weight, 0.009-0.014 % by weight, 99.67-99.74 the Fe of % by weight, surplus is inevitable impurity.
In addition, the method that slab cast by molten steel of the present invention is the method for this area routine, can by controlling to smelt and the condition of casting obtain above-mentioned slab.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, to the hot rolling of described slab and the concrete restriction of cold rolling condition, in order to 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 DEG C, finishing temperature is 850-900 DEG C, and coiling temperature is 700-750 DEG C; Described cold rolling condition comprises: cold rolling total reduction is 60-80%.
According to the present invention, in order to obtain the steel plate with surface uniform, aluminium-zinc coating attractive in appearance, need to carry out cleaning by degreasing to remove the impurity that surperficial greasy dirt, iron scale, iron powder etc. affect plate surface quality to the steel plate after above-mentioned process.Described cleaning by degreasing preferably includes alkali cleaning and electrolytic cleaning.The condition of described alkali cleaning and electrolytic cleaning controls the quality directly having influence on surface of steel plate, if cleaning is thorough not, will affect the homogeneity etc. of the 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 DEG C, 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 DEG C, 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 DEG C, 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 DEG C, 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, such as, the new clean-out system of interpolation can be adopted to regulate.When free alkalinity is lower than 65Pt, then can not fully cleans belt steel surface Residual oil, iron scale, iron powder, affect strip surface quality; When free alkalinity then wastes degreasing fluid higher than during 80Pt, 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 such as, when Continuous Hot Dip Galvanizing is carried out cleaning by degreasing, unit transmits with the speed of 60-120m/min.
According to the present invention, annealing process is comparatively large for the impact of the intensity of steel, in order to obtain the steel plate of 250-310MPa yield strength, 350-380MPa tensile strength, when particularly producing thin brilliant steel plate, needs strictly to control annealing temperature and unit speed.Preferably, the condition of described annealing comprises: temperature is 690-800 DEG C, and the time is 30-70s; More preferably, the condition of described annealing comprises: temperature is 760-800 DEG C, and the time is 35-50s.If annealing temperature lower than 30s lower than 690 DEG C or time, makes the recrystallize of steel plate incomplete, thus also there is deformed microstructure in steel plate, cause intensity abnormal high, plasticity is poor; If annealing temperature is greater than 70s higher than 800 DEG C or time, then recrystal grain alligatoring, can not get the recrystallized structure of fine uniform, 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.By above-mentioned aluminium-zinc alloy in zinc pot after melting, control 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 DEG C, and entering zinc pot front spring temperature is 575-590 DEG C.If bath temperature is lower than 585 DEG C, then flow of the electrolyte is poor, affects platability; If bath temperature is higher than 610 DEG C, plating solution and steel plate react fierce, make alloy layer increase layer, reduce the bonding force of coating.If the temperature of steel plate is lower than 575 DEG C or higher than 590 DEG C when steel plate enters zinc pot, all easily causes bath temperature fluctuation around steel plate, reduce platability.There is no particular limitation to enter the speed of zinc pot to steel plate in the present invention, as long as can make the steel plate relative 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).Such as, 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 even, preferably adopt air knife to purge.The condition optimization that described air knife purges comprises: pressure 12-30KPa is highly 250-350mm, and the vertical range apart from steel plate is 23-30mm; More preferably, the condition that described air knife purges comprises: pressure 18-20KPa is highly 300-350mm, and the vertical range apart from steel plate is 26-28mm.This air knife is preferably placed at above zinc pot, and so just can take the dish out of the pot at steel plate starts to purge.Described height refers to the height of melt liquid level in air knife distance zinc pot, and air knife is then the distance that after taking the dish out of the pot, air knife distance steel plate is nearest apart from the vertical range of steel plate.The vertical range of air knife height and distance steel plate and purging pressure unmatched, all affect coating uniformity, easily occur 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 cooled, the method that wind is swept can be adopted.The condition that the wind of cooling is swept is not particularly limited, as long as coating can be made to cool fast and fully can be combined with steel plate, Mobile fan such as can be adopted to carry out wind sweep, 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, then may cause zinc liquid can not rapid solidification, zinc be spent thick uneven, affects attractive in appearance and corrosion resistance of surface; If mobile air quantity is higher than 34450 squares ms/h, then plating solution is not fully combined with substrate, also makes zinc spend inequality simultaneously.
According to the present invention, by making enter zinc pot temperature, bath temperature and the air knife controling parameters of steel plate control in the scope of the invention described above, plating leakage can be prevented, zinc spends inequality, the surface imperfection such as groove print.
According to the present invention, the preparation method of described hot-dip coating aluminium-zinc alloy steel plate usually also comprises and carries out polishing and straightening to the steel plate of gained.Described polishing and straightening are the method for this area routine, and the polishing preferably adopted and straightening make described polishing unit elongation be 0.3-0.5%, and described straightening unit elongation is 0.4-0.6%.Such as, described polishing adopts rolling load master mode, and rolling load is 150t.Described straightening such as 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 usually also comprises and carries out passivation to the steel plate of gained, and the present invention preferably adopts chromium-free deactivation.Being not particularly limited the method for described passivation, can be the passivating method of this area routine.Preferably, described passivation is for adopting environmental protection chromium-free passivation liquid, and carry out surface treatment by roll coating model to band steel, the condition of described passivation comprises: the roller speed ratio that roller coat applied and dipped in liquid roller is 130:70, top roll roll-in is 50-110daN, and lower roll roll-in is 70-140daN.Under this condition, can ensure that uniform film thickness is stablized, 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 be described the present invention by embodiment.
Embodiment 1-3
The present embodiment is for illustration of hot-dip coating aluminium-zinc alloy steel plate of the present invention and preparation method thereof.
Hot rolling is carried out and cold rolling (the finish rolling start rolling temperature of hot rolling is 1000 DEG C, and finishing temperature is 870 DEG C, and coiling temperature is 720 DEG C by being obtained steel bar plate (its composition is as shown in table 1) by continuous metal cast process; Cold rolling draft is 70%) obtain cold-rolled steel sheet.Continuous Hot Dip Galvanizing being thought, 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 controls at 72Pt, and temperature is 83 DEG C; The condition of electrolytic cleaning is: free alkalinity controls at 72Pt, and temperature is 83 DEG C, and Faradaic current controls at 7000A; Above-mentioned being annealed into carries out annealing 35s at 760 DEG C; Send into zinc pot after annealing and carry out plate golding aluminium zinc alloy, the step of plate golding aluminium zinc alloy is: the temperature entering the steel plate before zinc pot is 590 DEG C, and the temperature of plating solution is 600 DEG C; Adopt air knife to purge above zinc pot, the condition that air knife purges is: pressure 18KPa is highly 300mm simultaneously, and the vertical range apart from steel plate is 28mm.The mobile air quantity carrying out after plating cooling is 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: environment-friendly chromium-free passivating solution is delivered to application roll by dipping in liquid roller by roller coating machine, then is evenly coated in surface of steel plate by application roll rotation.Roller coat application roll with dip in liquid roller roller speed ratio 135:68, top roll roll-in is 100daN, and lower roll roll-in is 80daN.Obtain the hot-dip coating aluminium-zinc alloy plate of fine uniform tissue, excellent surface quality, high formability energy thus, see Fig. 1, wherein, the substrate of steel plate relative to 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, unlike, alkali cleaning condition is: free alkalinity controls at 70Pt, and temperature is 80 DEG C; The condition of electrolytic cleaning is: free alkalinity controls at 70Pt, and temperature is 80 DEG C, and Faradaic current controls 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, unlike, be annealed into and carry out annealing 50s at 800 DEG C, gained hot-dip coating aluminium-zinc alloy steel plate is shown in Fig. 3.
Embodiment 6
According to the method in embodiment 1, unlike, the condition that air knife purges is: pressure 20KPa is highly 350mm, and the vertical range apart from steel plate is 26mm, 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 DEG C, 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
Hot-dip coating aluminium-zinc alloy steel plate is prepared according to embodiment 1 method.Unlike, the composition of steel bar plate is as shown in table 1.
Comparative example 2
Hot-dip coating aluminium-zinc alloy steel plate is prepared according to embodiment 1 method.Unlike, the composition of steel bar plate is as shown in table 1.
Test case 1
The method specified in GB/T228.1-2010 is adopted 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 method to the hot-dip coating aluminium-zinc alloy steel plate of embodiment 1-7 and comparative example 1-2 specified in GB/T2518-2008 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 |
Can be found out by the data of table 1 and 2, 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%, 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 characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out arbitrary combination between various different 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 (10)
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, with the gross weight of substrate of steel plate for benchmark, this substrate of steel plate contains the C of 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, the Si of less than 0.05 % by weight, the S of less than 0.015 % by weight, 99.63-99.79 the Fe of % by weight, surplus is inevitable impurity.
2. 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.
3. hot-dip coating aluminium-zinc alloy steel plate according to claim 1 and 2, wherein, the substrate of steel plate relative to every square metre, the weight of described al-zn alloy coating is 50-150g.
4. 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 hot rolling successively, cold rolling, cleaning by degreasing, annealing, hot dip aluminum plating zinc alloy and purging, with the gross weight of slab for benchmark, this slab contains the C of 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, the Si of less than 0.05 % by weight, the S of less than 0.015 % by weight, 99.63-99.79 the Fe of % by weight, surplus is inevitable impurity.
5. method according to claim 4, wherein, the condition of described hot rolling comprises: hot fine rolling temperature in is 900-1050 DEG C, and finishing temperature is 850-900 DEG C, and coiling temperature is 700-750 DEG C; Described cold rolling condition comprises: cold rolling total reduction is 60-80%.
6. method according to claim 4, 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 DEG C; The condition of described electrolytic cleaning comprises: the free alkalinity of scavenging solution is 65-80Pt, and temperature is 70-90 DEG C, and electric current is 6500-7500A.
7. method according to claim 4, wherein, the condition of described annealing comprises: temperature is 750-800 DEG C, and the time is 30-70s.
8. method according to claim 4, wherein, the condition of described hot dip aluminum plating zinc alloy comprises: bath temperature is 580-610 DEG C, and entering zinc pot front spring temperature is 575-590 DEG C; The condition of this hot dip aluminum plating zinc alloy makes the steel plate relative to every square metre, and the weight of described al-zn alloy coating is 50-150g.
9. method according to claim 4, wherein, described purging is that air knife purges, and the condition that described air knife purges comprises: pressure 12-20KPa is highly 250-350mm, and the vertical range apart from steel plate is 23-30mm.
10. method according to claim 4, wherein, the method also comprises the steel plate after being purged by air knife and 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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| CN105369136B (en) * | 2014-08-22 | 2017-07-14 | 上海梅山钢铁股份有限公司 | A kind of hot-dip aluminizing zincium steel plate and its manufacture method |
| CN105088073B (en) | 2015-08-28 | 2017-10-31 | 宝山钢铁股份有限公司 | 600MPa grades of high-elongation hot-dip aluminizing zincs of yield strength and color coated steel sheet and its manufacture method |
| CN105063484B (en) | 2015-08-28 | 2017-10-31 | 宝山钢铁股份有限公司 | 500MPa grades of high-elongation hot-dip aluminizing zincs of yield strength and color coated steel sheet and its manufacture method |
| 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 |
| CN105970105B (en) * | 2016-06-08 | 2018-03-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Ultra-deep punching hot dip aluminum zinc plate/band and preparation method thereof |
| 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 |
| CN112437710B (en) * | 2018-06-22 | 2023-07-14 | 日本制铁株式会社 | Steel sheet, tailor-welded blank, hot-press molded article, steel pipe, hollow quenched molded article, and method for producing these |
| 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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