CN104060165A - Hot-dipped aluminum-zinc alloy steel plate and manufacturing method thereof - Google Patents
Hot-dipped aluminum-zinc alloy steel plate and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a hot-dipped aluminum-zinc alloy steel plate which includes a steel plate base material and an aluminum-zinc alloy coating on a surface of the steel plate base material, wherein the steel plate base material comprises, based on the total weight of the steel plate base material, 0.04-0.12 wt% of carbon, 0.2-0.6 wt% of manganese, 0.02-0.1 wt% of phosphorus, 0.01-0.05 wt% of titanium, 0.02-0.07 wt% of aluminum, less than 0.05 wt% of silicon, less than 0.015 wt% of sulfur, 98.99-99.71 wt% of ferrum and the balance unavoidable impurities. The invention also discloses a manufacturing method of the hot-dipped aluminum-zinc alloy steel plate. By means of the manufacturing method, the hot-dipped aluminum-zinc alloy steel plate which is high in strength and good in surface quality can be manufactured. The manufacturing method is simple in technology and low in cost.
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 more and more higher to the requirement of energy-saving and emission-reduction, energy consumption, product stability and the security of building structure use, household electrical appliances use hot-dip coating aluminium-zinc alloy steel plate, also increasing to the demand of the hot-dip coating aluminium-zinc alloy steel plate of high strength, great surface quality, flash plating.
At present, mainly by controlling composition composition and production technique, prepare such steel plate of premium properties, for example: CN101736195A discloses a kind of hot-dip coating aluminium-zinc alloy steel plate and production method thereof, this hot-dip coating aluminium-zinc alloy steel plate substrate of steel plate used contains the C that is greater than 0.03 % by weight to 0.1 % by weight, the Mn of 0.15-0.35 % by weight, the Ti of 0.001-0.02 % by weight, the Nb of 0.005-0.03 % by weight, the Al of 0.01-0.065 % by weight, the Fe of 99.44-99.8 % by weight.By add titanium and niobium in steel plate, further crystal grain thinning, raising plate surface quality and over-all properties, and by slab hot rolling, pickling, cold rolling and hot dip aluminum plating zinc alloy, realized the online batch production of thick intensity hot aluminizing zinc alloy steel plate product with a high standard on continuously dip coat unit.Yet this application need to be used precious metal niobium, and cost is higher, coating surface quality is not controlled.
CN1542158A discloses a kind of hot-dip coating aluminium-zinc alloy steel plate and manufacture method thereof for building trade steel construction and automobile component etc.Adopt cold-rolled steel sheet after electrochemical degreasing, thermal treatment, by the hot dip of aluminium zinc solution, on cold-rolled steel sheet pros and cons, then, polishing cooling through blower fan, oven dry, hydraulic cutter are finished product.But it is that yield strength is that 240MPa is following, tensile strength is the SPCD steel band below 270MPa that this invention relates to, and does not relate to the hot dip aluminum plating zinc technology of high-strength steel and the control of surface quality technique.
Therefore, be badly in need of a kind of cost is low, intensity is high and surface quality is good hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof.
Summary of the invention
The object of the invention is to overcome above-mentioned problems of the prior art, hot-dip coating aluminium-zinc alloy steel plate that a kind of cost is low, intensity is high and surface quality is good and preparation method thereof is provided.
The present inventor furthers investigate discovery, by the P that makes to contain 0.02-0.1 % by weight in substrate of steel plate and the Ti of 0.01-0.05 % by weight, and make the C that contains 0.04-0.12 % by weight in steel plate, the Mn of 0.2-0.6 % by weight, the Al of 0.02-0.07 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, just can be without increase C and Mn to substrate of steel plate in the situation that, obtain high-intensity steel plate, and, this steel plate can reduce removing the phosphorus in molten steel, can reduce costs, shorten the time of preparing hot-dip coating aluminium-zinc alloy steel plate, completed thus the present invention.
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, the gross weight of substrate of steel plate of take is benchmark, the C that this substrate of steel plate contains 0.04-0.12 % by weight, the Mn of 0.2-0.6 % by weight, the P of 0.02-0.1 % by weight, the Ti of 0.01-0.05 % by weight, the Al of 0.02-0.07 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, the Fe of 98.99-99.71 % by weight, surplus is inevitable impurity.
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, the gross weight of slab of take is benchmark, the C that this slab contains 0.04-0.12 % by weight, the Mn of 0.2-0.6 % by weight, the P of 0.02-0.1 % by weight, the Ti of 0.01-0.05 % by weight, the Al of 0.02-0.07 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, 98.99-99.71 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 higher than 380MPa, tensile strength is higher than 460MPa, and unit elongation is higher than 23%, and surperficial group of product reach high strength, great surface quality and the lower-cost hot-dip coating aluminium-zinc alloy steel plate of FC level.
Other features and advantages of the present invention partly in detail are described the embodiment 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.
Fig. 6 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that makes of embodiment 8.
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, the gross weight of substrate of steel plate of take is benchmark, the C that this substrate of steel plate contains 0.04-0.12 % by weight, the Mn of 0.2-0.6 % by weight, the P of 0.02-0.1 % by weight, the Ti of 0.01-0.05 % by weight, the Al of 0.02-0.07 % by weight, the Si below 0.05 % by weight, the S below 0.015 % by weight, 98.99-99.71 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 access the substrate of steel plate that cost is lower and intensity is higher, but under preferable case, the gross weight of substrate of steel plate of take is benchmark, the C that this substrate of steel plate contains 0.06-0.08 % by weight, the Mn of 0.3-0.4 % by weight, the P of 0.04-0.05 % by weight, the Ti of 0.02-0.03 % by weight, the Al of 0.04-0.05 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, the Fe of 99.32-99.54 % by weight, surplus is inevitable impurity.
According to the present invention, the content of described phosphorus is controlled within the scope of 0.02-0.1 % by weight.By phosphorus is controlled within the scope of this, can improve the intensity of substrate of steel plate.In order further to improve the intensity of substrate of steel plate, the content of preferred described phosphorus is controlled within the scope of 0.04-0.05 % by weight.
In the present invention, due to the phosphorus in substrate of steel plate is controlled to higher scope, therefore reduce the add-on of dephosphorization slag former in liquid steel dephosphorization step, reduced production cost., due to the phosphorus content in suitable maintenance substrate of steel plate, can suitably reduce adding of other strengthening elements meanwhile, such as Mn, C etc., thus when guaranteeing to obtain high-intensity substrate of steel plate, simplified technique, and reduced production cost.
In the present invention, the titanium (Ti) of trace be mainly that effect is the fixing formation of the nitrogen in steel 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 0.01-0.05 % by weight, preferably within the scope of 0.02-0.03 % 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 when guaranteeing to obtain high-intensity substrate of steel plate, simplified 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 when 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 0.04 % by weight, during steel-making, must carry out vacuum-treat, increase production cost, if carbon content surpasses 0.12 % by weight, not only because recarburization practice makes the production cost of steel-making, increase, 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 0.04-0.12 % by weight, is preferably 0.06-0.08 % 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 0.2-0.6 % by weight by manganese content, preferential 0.3-0.4 % by weight.
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 fixing nitrogen in steel of the form of aluminium nitride (AlN).But too high aluminium will affect welding property and the coating adhesion and uneconomical of steel, and 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 0.04-0.05 % 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 total content of Si and S is limited to below 0.015 % by weight.
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 better quality, to the composition of al-zn alloy coating and thickness, there is no particular limitation, can adopt conventional al-zn alloy coating to form 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 60-150g.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, the gross weight of al-zn alloy coating of for example can take is benchmark, in described al-zn alloy coating, the content of aluminium can be 50-65 % by weight, the content of zinc can be 35-50 % by weight, and the content of silicon is 1-2 % by weight.Under preferable case, the gross weight of al-zn alloy coating of take is benchmark, and in described al-zn alloy coating, the content of aluminium is 54-58 % by weight, and the content of zinc is 40-47 % by weight, and the content of silicon is 1.4-1.8 % by weight.The aluminium-zinc alloy of 55 % by weight Al-43.5 % by weight Zn-1.5 % by weight Si more preferably.
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, the gross weight of slab of take is benchmark, the C that this slab contains 0.04-0.12 % by weight, the Mn of 0.2-0.6 % by weight, the P of 0.02-0.1 % by weight, the Ti of 0.01-0.05 % by weight, the Al of 0.02-0.07 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, 98.99-99.71 the Fe of % by weight, surplus is inevitable impurity.
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, the hot rolling of described slab and cold rolling condition are not had to concrete restriction, in order to obtain the higher and smooth steel plate of intensity, under preferable case, the condition of described hot rolling comprises: hot fine rolling temperature in is 950-1100 ℃, finishing temperature is 820-900 ℃, and coiling temperature is 600-700 ℃; Described cold rolling condition comprises: cold rolling total reduction is 50-80%.
According to the present invention, in order to obtain, there is surface uniform, the steel plate of aluminium-zinc coating attractive in appearance, need to carry out cleaning by degreasing to the steel plate after above-mentioned processing affects the impurity of plate surface quality to remove surperficial greasy dirt, iron scale, iron powder etc.Described cleaning by degreasing preferably includes alkali cleaning and electrolytic cleaning.The condition of described alkali cleaning and electrolytic cleaning is controlled and will directly be had influence on the quality of surface of steel plate, if clean thoroughly not, will affect the homogeneity etc. of the aluminium-zinc coating of gained.In the present invention, the condition optimization of described alkali cleaning comprises: the free alkalinity of scavenging solution is 65-80Pt, and temperature is 70-85 ℃, and the time is 5-60s; The condition optimization 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, 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; When free alkalinity, waste degreasing fluid during higher than 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 for example, while carrying out cleaning by degreasing in Continuous Hot Dip Galvanizing, 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 high-intensity steel plate, while particularly producing thin brilliant high-strength steel, need to strictly control annealing temperature and unit speed.Preferably, the condition of described annealing comprises: temperature is 680-820 ℃, and the time is 30-70s.If annealing temperature, made the recrystallize of steel plate incomplete, thereby also has deformed microstructure in steel plate lower than 30s lower than 680 ℃ or time, cause intensity extremely high, plasticity is poor; If annealing temperature is greater than 70s higher than 820 ℃ 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 60-150g 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, with the transfer rate of 60-120m/min, transmit.
According to the present invention, need to the aluminium-zinc alloy melt on steel plate out from zinc pot be purged, 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, apart from the vertical range of steel plate, is 23-30mm.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 that air knife is apart from the height of 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, if can so that 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, makes zinc spend inequality simultaneously yet.
According to the present invention, by making enter zinc pot temperature, bath temperature and the air knife of steel plate control parameter and be controlled in the scope of the invention described above, 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 0.2-0.5% that the polishing preferably adopting and straightening make described polishing unit elongation, and described straightening unit elongation is 0.2-0.4%.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 higher than 380MPa, tensile strength is higher than 460MPa, and unit elongation is higher than 23%, and surperficial group of product reach high strength, great surface quality and the lower-cost hot-dip coating aluminium-zinc alloy steel plate of FC level.
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 carries out hot rolling and cold rolling (the finish rolling start rolling temperature of hot rolling is 1050 ℃, and finishing temperature is 860 ℃, and coiling temperature is 600 ℃; Cold rolling draft is 65%) 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 75Pt, and temperature is 80 ℃; The condition of electrolytic cleaning is: free alkalinity is controlled at 75Pt, and temperature is 85 ℃, and Faradaic current is controlled at 7000A; The above-mentioned 35s that anneals at 750 ℃ 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 585 ℃, and the temperature of plating solution is 600 ℃; Simultaneously zinc pot top adopts air knife to purge, and the condition of air knife purging is: pressure 18KPa is highly 300mm, apart from the vertical range of steel plate, is 28mm.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 0.35%; Straightening unit elongation 0.3%; 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 130:70, top roll roll-in is 100daN, lower roll roll-in is 80daN.Obtain thus tiny uniform formation, excellent surface quality, high-intensity hot-dip coating aluminium-zinc alloy plate, 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 120g(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 65Pt, and temperature is 70 ℃; The condition of electrolytic cleaning is: free alkalinity is controlled at 65Pt, and temperature is 75 ℃, and Faradaic current is controlled at 6500A, 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 60s 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 25KPa is highly 350mm, apart from the vertical range of steel plate, is 25mm, and gained hot-dip coating aluminium-zinc alloy steel plate is shown in Fig. 4.
Embodiment 7
According to the method in embodiment 1, prepare hot-dip coating aluminium-zinc alloy steel plate, difference is, annealing temperature is 650 ℃, and the composition of cold-rolled steel sheet is as shown in table 1.Gained hot-dip coating aluminium-zinc alloy steel plate is shown in Fig. 5.
Embodiment 8
According to the method in embodiment 1, prepare hot-dip coating aluminium-zinc alloy steel plate, difference is, the composition of cold-rolled steel sheet is as shown in table 1, the free alkalinity of the alkali cleaning that cleaning by degreasing is used and the scavenging solution of electrolytic cleaning is 60Pt, the condition that air knife purges is: pressure 10KPa, being highly 200mm, is 20mm apart from the vertical range of steel plate.Gained hot-dip coating aluminium-zinc alloy steel plate is shown in Fig. 6, and visible coating surface has serious zinc flow liner.
Comparative example 1
According to embodiment 1 method, prepare hot-dip coating aluminium-zinc alloy steel plate.Different, the composition of cold-rolled steel sheet is as shown in table 1.
Comparative example 2
According to embodiment 1 method, prepare hot-dip coating aluminium-zinc alloy steel plate.Different, the composition of cold-rolled steel sheet is as shown in table 1.
Test case 1
Adopt the method for stipulating in GB/T228.1-2010 respectively the hot-dip coating aluminium-zinc alloy steel plate of embodiment 1-8 and comparative example 1-2 to be carried out to the test of yield strength, tensile strength, unit elongation, adopt the method for stipulating in GB/T2518-2008 to judge the surface group product of the hot-dip coating aluminium-zinc alloy steel plate of embodiment 1-8 and comparative example 1-2, 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 | 440 | 500 | 25 | FC |
| Embodiment 2 | 380 | 460 | 30 | FC |
| Embodiment 3 | 460 | 520 | 23 | FC |
| Embodiment 4 | 438 | 501 | 26 | FC |
| Embodiment 5 | 425 | 495 | 28 | FC |
| Embodiment 6 | 442 | 499 | 25.5 | FC |
| Embodiment 7 | 505 | 546 | 12 | FC |
| Embodiment 8 | 420 | 480 | 23 | FA (zinc flow liner) |
| Comparative example 1 | 340 | 400 | 26 | FC |
| Comparative example 2 | 320 | 402 | 27 | FC |
Data by table 1 and 2 can be found out, in the present invention, suitably improve the content of P and added reinforced metal element ti, can obtain simply efficiently high-intensity steel plate, adopt method of the present invention simultaneously, can access the hot-dip coating aluminium-zinc alloy steel plate of great surface quality.
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 for fear of unnecessary repetition by any suitable mode, the present invention is to the explanation no longer separately of various possible array modes.
In addition, between various embodiment of the present invention, also can carry out arbitrary combination, 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, the gross weight of substrate of steel plate of take is benchmark, the C that this substrate of steel plate contains 0.04-0.12 % by weight, the Mn of 0.2-0.6 % by weight, the P of 0.02-0.1 % by weight, the Ti of 0.01-0.05 % by weight, the Al of 0.02-0.07 % by weight, the Si below 0.05 % by weight, the S below 0.015 % by weight, 98.99-99.71 the Fe of % by weight, surplus is inevitable impurity.
2. hot-dip coating aluminium-zinc alloy steel plate according to claim 1, wherein, the gross weight of substrate of steel plate of take is benchmark, the C that this substrate of steel plate contains 0.06-0.08 % by weight, the Mn of 0.3-0.4 % by weight, the P of 0.04-0.05 % by weight, the Ti of 0.02-0.03 % by weight, the Al of 0.04-0.05 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, the Fe of 99.32-99.54 % 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 50-65 % by weight, and the content of zinc is 35-50 % by weight, and the content of silicon is 1-2 % 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 60-150g.
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, cold rolling, cleaning by degreasing, annealing, hot dip aluminum plating zinc alloy and purging successively, the gross weight of slab of take is benchmark, the C that this slab contains 0.05-0.12 % by weight, the Mn of 0.2-0.6 % by weight, the P of 0.02-0.1 % by weight, the Ti of 0.01-0.05 % by weight, the Al of 0.02-0.07 % by weight, Si below 0.05 % by weight, S below 0.015 % by weight, the Fe of 98.99-99.71 % 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 950-1100 ℃, and finishing temperature is 820-900 ℃, and coiling temperature is 600-700 ℃; Described cold rolling condition comprises: cold rolling total reduction is 50-80%.
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 680-820 ℃, 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 585-610 ℃, 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 60-150g.
10. method according to claim 5, wherein, described purging is that air knife purges, the condition that described air knife purges comprises: pressure 12-30KPa is highly 250-350mm, apart from the vertical range of steel plate, is 23-30mm.
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 0.2-0.5%, and described straightening unit elongation is 0.2-0.4%.
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| 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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