CN104060165B - 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 includes 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 0.04-0.12 weight %, the Mn of 0.2-0.6 weight %, the P of 0.02-0.1 weight %, the Ti of 0.01-0.05 weight %, the Al of 0.02-0.07 weight %, the Si of below 0.05 weight %, the S of below 0.015 weight %, 98.99-99.71 the Fe of weight %, surplus is inevitable impurity。The preparation method that the invention also discloses above-mentioned hot-dip coating aluminium-zinc alloy steel plate。Can prepare, by the method for the present invention, the hot-dip coating aluminium-zinc alloy steel plate that intensity is high and surface quality is good, and the simple cost of technique is low。
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 requirement of building structure use, the energy-saving and emission-reduction of household electrical appliances hot-dip coating aluminium-zinc alloy steel plate, energy consumption, product stability and safety is more and more higher, to high intensity, great surface quality, flash plating the demand of hot-dip coating aluminium-zinc alloy steel plate also increasing。
At present, such steel plate of premium properties is prepared mainly through control constituent and production technology, such as: CN101736195A discloses a kind of hot-dip coating aluminium-zinc alloy steel plate and production method thereof, substrate of steel plate used by this hot-dip coating aluminium-zinc alloy steel plate contains the C more than 0.03 weight % to 0.1 weight %, the Nb of Ti, the 0.005-0.03 weight % of Mn, the 0.001-0.02 weight % of 0.15-0.35 weight %, the Fe of Al, the 99.44-99.8 weight % of 0.01-0.065 weight %。By adding titanium and niobium in steel plate, further crystal grain thinning, raising plate surface quality and combination property, and by slab hot rolling, pickling, cold rolling and hot-dip aluminizing kirsite, it is achieved that the online batch production on continuously dip coat unit of the think gauge high intensity hot dipping alumin(i)um zinc alloy steel sheet product。But this application needs to use noble metal niobium, relatively costly, coating surface quality is not controlled。
CN1542158A discloses a kind of hot-dip coating aluminium-zinc alloy steel plate for building trade steel construction and auto parts and components etc. and manufacture method thereof。Adopt cold-rolled steel sheet after electrification defat, heat treatment, by aluminum zinc solution hot dip on cold-rolled steel sheet positive and negative, be finished product then through blower fan cooling, finishing, drying, hydraulic cutter。But this invention relates to being yield strength being below 240MPa, tensile strength to be the SPCD steel band of below 270MPa, is not directed to the hot-dip aluminizing zinc technology of high-strength steel and the control of surface quality technique。
Therefore, 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 it is badly in need of。
Summary of the invention
It is an object of the invention to overcome above-mentioned problems of the prior art, it is provided that 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。
The present inventor furthers investigate discovery, by making substrate of steel plate contains the Ti of P and the 0.01-0.05 weight % of 0.02-0.1 weight %, and make steel plate contains the C of 0.04-0.12 weight %, the Mn of 0.2-0.6 weight %, the Al of 0.02-0.07 weight %, the Si of below 0.05 weight %, the S of below 0.015 weight %, just can when without increasing C and Mn to substrate of steel plate, obtain the steel plate of high intensity, and, this steel plate can reduce the elimination to the phosphorus in molten steel, cost can be reduced, the time of hot-dip coating aluminium-zinc alloy steel plate is prepared in shortening, this completes the present invention。
To achieve these goals, the present invention provides a kind of hot-dip coating aluminium-zinc alloy steel plate, this hot-dip coating aluminium-zinc alloy steel plate includes 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 0.04-0.12 weight %, the Mn of 0.2-0.6 weight %, the Al of Ti, the 0.02-0.07 weight % of P, the 0.01-0.05 weight % of 0.02-0.1 weight %, the Si of below 0.05 weight %, the Fe of S, the 98.99-99.71 weight % of below 0.015 weight %, surplus is inevitable impurity。
The preparation method that present invention also offers above-mentioned hot-dip coating aluminium-zinc alloy steel plate, wherein, the method includes molten steel is cast slab, gained slab is sequentially carried out hot rolling, cold rolling, cleaning by degreasing, annealing, hot-dip aluminizing kirsite and air knife purge, with the gross weight of slab for benchmark, this slab contains the C of 0.04-0.12 weight %, the Mn of 0.2-0.6 weight %, the P of 0.02-0.1 weight %, the Ti of 0.01-0.05 weight %, the Al of 0.02-0.07 weight %, the Si of below 0.05 weight %, the S of below 0.015 weight %, 98.99-99.71 the Fe of weight %, surplus is inevitable impurity。
The preparation method of the hot-dip coating aluminium-zinc alloy steel plate according to the present invention, yield strength can be obtained higher than 380MPa, tensile strength is higher than 460MPa, and elongation percentage is higher than 23%, and surface group product reach the high intensity of FC level, great surface quality and lower-cost hot-dip coating aluminium-zinc alloy steel plate。
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently。
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, is used for explaining the present invention, but is not intended that limitation of the present invention together with detailed description below。In the accompanying drawings:
Fig. 1 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that embodiment 1 prepares。
Fig. 2 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that embodiment 4 prepares。
Fig. 3 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that embodiment 5 prepares。
Fig. 4 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that embodiment 6 prepares。
Fig. 5 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that embodiment 7 prepares。
Fig. 6 is the microgram of the hot-dip coating aluminium-zinc alloy steel plate that embodiment 8 prepares。
Detailed description of the invention
Hereinafter the specific embodiment of the present invention is described in detail。It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains the present invention, it 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 includes 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 0.04-0.12 weight %, the Mn of 0.2-0.6 weight %, the P of 0.02-0.1 weight %, the Ti of 0.01-0.05 weight %, the Al of 0.02-0.07 weight %, the Si of below 0.05 weight %, the S of below 0.015 weight %, 98.99-99.71 the Fe of weight %, surplus is inevitable impurity。
According to the present invention, as long as the content making the constituent of substrate of steel plate controls in above-mentioned scope, just can obtain less costly and that intensity is higher 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 0.06-0.08 weight %, the Mn of 0.3-0.4 weight %, the Al of Ti, the 0.04-0.05 weight % of P, the 0.02-0.03 weight % of 0.04-0.05 weight %, the Si of below 0.05 weight %, the Fe of S, the 99.32-99.54 weight % of below 0.015 weight %, surplus is inevitable impurity。
According to the present invention, the content of described phosphorus controls within the scope of 0.02-0.1 weight %。By phosphorus is controlled within the scope of this, it is possible to increase the intensity of substrate of steel plate。In order to improve the intensity of substrate of steel plate further, it is preferable that the content of described phosphorus controls within the scope of 0.04-0.05 weight %。
In the present invention, owing to the phosphorus in substrate of steel plate being controlled in higher scope, therefore decrease the addition of dephosphorization slag former in liquid steel dephosphorization step, reduce production cost。Simultaneously as suitable keeps the phosphorus content in substrate of steel plate, it is possible to suitably reduce the addition of other intensified elements, for instance Mn, C etc., thus while ensureing the substrate of steel plate of acquisition high intensity, simplifying technique, and reduce production cost。
In the present invention, the mainly effect of the titanium (Ti) of trace is the effect with crystal grain thinning of nitrogen formation TiN, the TiN in fixing steel；And Ti can also precipitate out TiC, TiC and has precipitation strength effect in annealing process。But Ti content is too much, and its invigoration effect also can tend to saturated。Therefore, in the galvanizing aluminium alloy steel plate of the present invention, Ti content controls within the scope of 0.01-0.05 weight %, it is preferable that within the scope of 0.02-0.03 weight %。The present invention is by suitably keeping the content of the titanium in substrate of steel plate, such that it is able to suitably reduce the addition of other intensified elements, for instance Mn, C etc., thus while ensureing the substrate of steel plate of acquisition high intensity, simplifying technique, and reduce production cost。
It 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 controlling in above-mentioned scope by P and the Ti in molten steel, it is possible to avoids this phenomenon, makes the precipitation strength of Ti and the solution strengthening of P concurrently and independently realize 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 performance reduce。The selection of described carbon content scope is mainly in view of operability and the economy of process for making, and the combination property of product, if carbon content is lower than 0.04 weight %, application of vacuum must be carried out during steel-making, increase production cost, if carbon content is more than 0.12 weight %, not only make because of recarburization practice the production cost of steel-making increase, and the plasticity of steel plate reduces, welding performance worsens simultaneously。Therefore, the content of the C in the galvanizing aluminium alloy steel plate of the present invention is 0.04-0.12 weight %, it is preferred to 0.06-0.08 weight %。
In the present invention, manganese (Mn) is solution strengthening element, increases Fe content and can improve intensity, and Mn can also be combined into MnS with sulfur (S) simultaneously, it is prevented that S produces fire check because forming FeS。But the present invention is for ensureing spot welding characteristics, is controlled by Fe content at 0.2-0.6 weight %, preferential 0.3-0.4 weight %。
In the present invention, the purpose adding aluminum (Al) mainly has two, and one is the oxygen in elimination steel, it is to avoid form non-metallic inclusion in process of setting, and it two be fix the nitrogen in steel with the form of aluminium nitride (AlN)。But too high aluminum will affect the welding performance of steel and coating adhesion and uneconomical, and therefore, in the galvanizing aluminium alloy steel plate of the present invention, aluminum content controls within the scope of 0.02-0.07 weight %, it is preferable that in the scope of 0.04-0.05 weight %。
Generally, silicon (Si) and sulfur (S) remain existence as inevitable impurity, wherein too high silicone content, after heat treatment, the enrichment of surface of steel plate silicon is substantially, affect the platability of steel plate, cause surface of steel plate plating leakage point defect, affect corrosion resistance and the surface quality of steel plate；The plasticity of steel plate can be had adverse effect on by too high sulfur, 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 below 0.05 weight %, the content of S is limited to below 0.015 weight %, it is preferable that the total content of Si and S is limited to below 0.015 weight %。
According to the present invention, adopt above-mentioned substrate of steel plate, being obtained with 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, it is possible to adopts conventional al-zn alloy coating composition and thickness。But under preferable case, in order to take into account coating decay resistance 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 60-150g。The weight of described al-zn alloy coating is the gross weight of two sides al-zn alloy coating。Heretofore described alumin(i)um zinc alloy can be the alumin(i)um 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 aluminum can be 50-65 weight %, the content of zinc can be 35-50 weight %, and the content of silicon is 1-2 weight %。Under preferable case, with the gross weight of al-zn alloy coating for benchmark, in described al-zn alloy coating, the content of aluminum is 54-58 weight %, and the content of zinc is 40-47 weight %, and the content of silicon is 1.4-1.8 weight %。It is more preferably the alumin(i)um zinc alloy of 55 weight %Al-43.5 weight %Zn-1.5 weight %Si。
The preparation method that present invention also offers above-mentioned hot-dip coating aluminium-zinc alloy steel plate, wherein, the method includes molten steel is cast slab, gained slab is sequentially carried out hot rolling, cold rolling, cleaning by degreasing, annealing, hot-dip aluminizing kirsite and air knife purge, with the gross weight of slab for benchmark, this slab contains the C of 0.04-0.12 weight %, the Mn of 0.2-0.6 weight %, the P of 0.02-0.1 weight %, the Ti of 0.01-0.05 weight %, the Al of 0.02-0.07 weight %, the Si of below 0.05 weight %, the S of below 0.015 weight %, 98.99-99.71 the Fe of weight %, surplus is inevitable impurity。
The method that the method for slab is this area routine cast by the molten steel of the present invention, it is possible to obtain above-mentioned slab by the condition controlling to smelt and cast。The method of described casting can be molding 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 and cold rolling condition to described slab do not have concrete restriction, the steel plate higher and smooth in order to obtain intensity, under preferable case, the condition of described hot rolling includes: hot fine rolling inlet temperature is 950-1100 DEG C, finishing temperature is 820-900 DEG C, and coiling temperature is 600-700 DEG C；Described cold rolling condition includes: cold rolling total reduction is 50-80%。
According to the present invention, in order to obtain the steel plate with surface aluminium-zinc coating uniform, attractive in appearance, it is necessary to the steel plate after above-mentioned process is carried out cleaning by degreasing affects the impurity of plate surface quality to remove the greasy dirt on surface, iron scale, iron powder etc.。Described cleaning by degreasing preferably includes alkali cleaning and electrolytic cleaned。The condition of described alkali cleaning and electrolytic cleaned controls to directly influence the quality of surface of steel plate, if cleaning thorough not, will affect the uniformity etc. of the aluminium-zinc coating of gained。In the present invention, the condition of described alkali cleaning preferably includes: the free alkalinity of cleanout fluid is 65-80Pt, and temperature is 70-85 DEG C, and the time is 5-60s；The condition of described electrolytic cleaned preferably includes: the free alkalinity of cleanout fluid is 65-80Pt, and temperature is 70-90 DEG C, 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 instance the new abluent of interpolation can be adopted to be adjusted。When free alkalinity is lower than 65Pt, then can not fully clean belt steel surface Residual oil, iron scale, iron powder, affect strip surface quality；Then waste degreaser when free alkalinity is higher than 80Pt, increase production cost。It addition, the duration used by described cleaning by degreasing can determine according to the situation of the impurity content of concrete surface of steel plate, for instance, when 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 relatively big for the impact of the intensity of steel, in order to obtain the steel plate of high intensity, when particularly producing thin brilliant high-strength steel, it is necessary to strictly control annealing temperature and unit speed。Preferably, the condition of described annealing includes: temperature is 680-820 DEG C, and the time is 30-70s。If annealing temperature lower than 680 DEG C or the time lower than 30s so that the recrystallization of steel plate is incomplete, thus there is also deformed microstructure in steel plate, causes that intensity is abnormal high, and plasticity is poor；If annealing temperature higher than 820 DEG C or time more than 70s, then recrystal grain alligatoring, can not get the recrystallized structure of fine uniform, gained intensity is relatively low。
According to the present invention, described hot-dip aluminizing kirsite can adopt continuous way hot dipping method, it would however also be possible to employ batch (-type) hot dipping method, but in order to improve productivity ratio and lumber recovery, present invention preferably employs continuous way hot dipping method。By above-mentioned alumin(i)um zinc alloy in zinc pot melted after, control the condition of plate golding aluminium zinc alloy well, above-mentioned steel plate transmission entered in zinc pot。The condition of the preferred described hot-dip aluminizing kirsite of the present invention includes: bath temperature is 585-610 DEG C, enters zinc pot front spring temperature and 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 adhesion of coating。If steel plate enters the temperature of steel plate during zinc pot and, lower than 575 DEG C or higher than 590 DEG C, all easily causes bath temperature fluctuation around steel plate, reduce platability。In the present invention, to the speed of steel plate entrance zinc pot, there is no particular limitation, as long as enabling to the steel plate relative to every square metre, the weight of described al-zn alloy coating is that 60-150g gets final product (gross weight that the weight of described al-zn alloy coating is 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, it is necessary to the alumin(i)um zinc alloy melt on steel plate out from zinc pot is purged so that the al-zn alloy coating on steel plate is distributed more uniform, it is preferred to use air knife purges。The condition that described air knife purges preferably includes: pressure 12-30KPa, is highly 250-350mm, and the vertical dimension from steel plate is 23-30mm。This air knife is preferably placed at above zinc pot, and thus can take the dish out of the pot at steel plate proceeds by purging。Described height refers to the height of melt liquid level in air knife distance zinc pot, and the air knife vertical dimension from steel plate is then the distance that after taking the dish out of the pot, air knife distance steel plate is nearest。Air knife height and the vertical dimension from steel plate and purge pressure unmatched, all affect coating uniformity, the surface defects such as zinc flow liner, zinc scar, zinc fluctuating easily occur。
According to the present invention, the steel plate after plate golding aluminium zinc alloy is cooled down, it is possible to adopt the method that wind is swept。The condition that the wind of cooling is swept is not particularly limited, as long as can so that coating quickly cools down and fully can be combined with steel plate, Mobile fan such as can being 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 result in zinc liquid can not rapid solidification, zinc is 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 of steel plate control state modulator in the scope of the invention described above, it is possible to prevent plating leakage, the surface defect such as zinc spends inequality, groove print。
According to the present invention, the preparation method of described hot-dip coating aluminium-zinc alloy steel plate generally also includes the steel plate to gained and carries out finishing and straightening。Described finishing and straightening are the method that this area is conventional, it is preferred to use finishing and straightening make described finishing elongation percentage be 0.2-0.5%, described straightening elongation percentage is 0.2-0.4%。Such as, described finishing adopts roll-force control model, and roll-force 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 generally also includes the steel plate of gained is passivated, and present invention preferably employs chromium-free deactivation。The method of described passivation is not particularly limited, it is possible to for the passivating method that this area is conventional。Preferably, strip steel, for adopting environmental protection chromium-free passivation liquid, is carried out surface treatment by roll coating model by described passivation, and the condition of described passivation includes: the roller speed ratio of roller coat coating and dipping liquid roller is 130:70, top roll roll-in is 50-110daN, and lower roll roll-in is 70-140daN。Under this condition, it is ensured that uniform film thickness is stable, there is no obvious aberration。
By above-mentioned preparation method, it is possible to preparing yield strength higher than 380MPa, tensile strength is higher than 460MPa, and elongation percentage is higher than 23%, and surface group product reach the high intensity of FC level, great surface quality and lower-cost hot-dip coating aluminium-zinc alloy steel plate。
Hereinafter will be described the present invention by embodiment。
Embodiment 1-3
The present embodiment is for hot-dip coating aluminium-zinc alloy steel plate that the present invention is described and preparation method thereof。
Hot rolling is carried out and cold rolling (the finish rolling start rolling temperature of hot rolling is 1050 DEG C, and finishing temperature is 860 DEG C, and coiling temperature is 600 DEG C by obtaining steel bar plate by continuous metal cast process；Cold rolling reduction ratio is 65%) obtain cold-rolled steel sheet。Continuous Hot Dip Galvanizing being thought, the transfer rate of 100m/min carries out alkali cleaning, electrolytic cleaned, annealing and plate golding aluminium zinc alloy。Wherein, alkali cleaning condition is: free alkalinity controls at 75Pt, and temperature is 80 DEG C；The condition of electrolytic cleaned is: free alkalinity controls at 75Pt, and temperature is 85 DEG C, and Faradaic current controls at 7000A；Above-mentioned being annealed into is annealed 35s at 750 DEG C；Sending 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 585 DEG C, and the temperature of plating solution is 600 DEG C；Adopting air knife to purge above zinc pot, the condition that air knife purges is: pressure 18KPa, is highly 300mm, and the vertical dimension from steel plate is 28mm simultaneously。The mobile air quantity carrying out after plating cooling down is 28000 squares ms/h。Then, carrying out finishing, straightening and chromium-free deactivation, wherein, finishing elongation control is 0.35%；Straightening elongation percentage 0.3%；The condition of passivation includes: environment-friendly chromium-free passivating solution is delivered to application roll by dipping liquid roller by roll coater, rotates again through application roll and is evenly coated in surface of steel plate。Roller coat application roll and dipping liquid roller roller speed ratio 130:70, top roll roll-in is 100daN, and lower roll roll-in is 80daN。Thus obtain the hot-dip coating aluminium-zinc alloy plate of fine uniform tissue, excellent surface quality, high intensity, see Fig. 1, wherein, the substrate of steel plate relative to 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, the difference is that, alkali cleaning condition is: free alkalinity controls at 65Pt, and temperature is 70 DEG C；The condition of electrolytic cleaned is: free alkalinity controls at 65Pt, and temperature is 75 DEG C, and Faradaic current controls 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, the difference is that, it being annealed at 800 DEG C, be annealed 60s, gained hot-dip coating aluminium-zinc alloy steel plate is shown in Fig. 3。
Embodiment 6
According to the method in embodiment 1, the difference is that, the condition that air knife purges is: pressure 25KPa, is highly 350mm, and the vertical dimension from steel plate is 25mm, 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, institute the difference is that, annealing temperature is 650 DEG C, 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
Hot-dip coating aluminium-zinc alloy steel plate is prepared according to the method in embodiment 1, institute the difference is that, the composition of cold-rolled steel sheet is as shown in table 1, alkali cleaning and the free alkalinity of the cleanout fluid of electrolytic cleaned used by cleaning by degreasing are 60Pt, the condition that air knife purges is: pressure 10KPa, being highly 200mm, the vertical dimension from steel plate is 20mm。Gained hot-dip coating aluminium-zinc alloy steel plate is shown in Fig. 6, it is seen that coating surface has serious zinc flow liner。
Comparative example 1
Hot-dip coating aluminium-zinc alloy steel plate is prepared according to embodiment 1 method。The difference is that, the composition of cold-rolled steel sheet is as shown in table 1。
Comparative example 2
Hot-dip coating aluminium-zinc alloy steel plate is prepared according to embodiment 1 method。The difference is that, the composition of cold-rolled steel sheet is as shown in table 1。
Test case 1
Adopt the method for regulation in GB/T228.1-2010 that the hot-dip coating aluminium-zinc alloy steel plate of embodiment 1-8 and comparative example 1-2 carries out the test of yield strength, tensile strength, elongation percentage respectively, adopting the method for regulation in GB/T2518-2008 that the surface group product of the hot-dip coating aluminium-zinc alloy steel plate of embodiment 1-8 and comparative example 1-2 are judged, its result is in Table 2。
Table 1
Table 2
| Numbering | Yield strength (MPa) | Tensile strength (MPa) | Elongation percentage (%) | 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 |
Be can be seen that by the data of table 1 and 2, the present invention suitably improves the content of P and adds reinforced metal element ti, can simply and efficiently obtain the steel plate of high intensity, adopt method of the invention, it is possible to obtain the hot-dip coating aluminium-zinc alloy steel plate of great surface quality simultaneously。
The preferred embodiment of the present invention described in detail above; but, the present invention is not limited to the detail in above-mentioned embodiment, in the technology concept of the present invention; technical scheme can being carried out multiple simple variant, these simple variant belong to protection scope of the present invention。
It is further to note that, each concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, it is possible to being combined in order to avoid unnecessary repetition by any suitable mode, various possible compound modes are no longer illustrated by the present invention separately。
Additionally, can also carry out combination in any between the various different embodiment of the present invention, as long as it is without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally。
Claims (9)
1. the preparation method of a hot-dip coating aluminium-zinc alloy steel plate, it is characterized in that, the method includes molten steel is cast slab, gained slab is sequentially carried out hot rolling, cold rolling, cleaning by degreasing, annealing, hot-dip aluminizing kirsite and purging, with the gross weight of slab for benchmark, this slab contains the C of 0.05-0.12 weight %, the Mn of 0.2-0.6 weight %, the P of 0.02-0.1 weight %, the Ti of 0.01-0.05 weight %, the Al of 0.02-0.07 weight %, the Si of below 0.05 weight %, the S of below 0.015 weight %, 98.99-99.71 the Fe of weight %, surplus is inevitable impurity；Wherein, the condition of described hot rolling includes: hot fine rolling inlet temperature is 950-1100 DEG C, and finishing temperature is 820-900 DEG C, and coiling temperature is 600-700 DEG C；The condition of described hot-dip aluminizing kirsite includes: bath temperature is 585-610 DEG C, enters zinc pot front spring temperature and is 575-590 DEG C。
2. method according to claim 1, wherein, described cold rolling condition includes: cold rolling total reduction is 50-80%。
3. method according to claim 1, wherein, described cleaning by degreasing includes alkali cleaning and electrolytic cleaned；The condition of described alkali cleaning includes: the free alkalinity of cleanout fluid is 65-80Pt, and temperature is 70-85 DEG C；The condition of described electrolytic cleaned includes: the free alkalinity of cleanout fluid is 65-80Pt, and temperature is 70-90 DEG C, and electric current is 6500-7500A。
4. method according to claim 1, wherein, the condition of described annealing includes: temperature is 680-820 DEG C, and the time is 30-70s。
5. method according to claim 1, wherein, the condition of this hot-dip aluminizing kirsite makes the steel plate relative to every square metre, the weight of described al-zn alloy coating be 60-150g。
6. method according to claim 1, wherein, described purging is that air knife purges, and the condition that described air knife purges includes: pressure 12-30KPa, is highly 250-350mm, and the vertical dimension from steel plate is 23-30mm。
7. method according to claim 1, wherein, the steel plate that the method also includes after being purged by air knife carries out finishing and straightening, and described finishing elongation percentage is 0.2-0.5%, and described straightening elongation percentage is 0.2-0.4%。
8. method according to claim 1, wherein, with the gross weight of slab for benchmark, this slab contains the C of 0.06-0.08 weight %, the Mn of 0.3-0.4 weight %, the Al of Ti, the 0.04-0.05 weight % of P, the 0.02-0.03 weight % of 0.04-0.05 weight %, the Si of below 0.05 weight %, the Fe of S, the 99.32-99.54 weight % of below 0.015 weight %, surplus is inevitable impurity。
9. method according to claim 5, wherein, in al-zn alloy coating, the content of aluminum is 50-65 weight %, and the content of zinc is 35-50 weight %, and the content of silicon is 1-2 weight %。
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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 |
| CN107904490A (en) * | 2017-11-21 | 2018-04-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Structure Thin Specs hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof |
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| CN110423868A (en) * | 2019-08-07 | 2019-11-08 | 北京首钢冷轧薄板有限公司 | A method of it eliminating hot galvanizing and surrenders 380MPa grades of cold rolling low-alloy strip orange peel defects |
| CN110607476A (en) * | 2019-09-30 | 2019-12-24 | 柳州钢铁股份有限公司 | Manufacturing method of cold-rolled hot-galvanized high-strength structural steel with yield strength of 350MPa |
| CN110699606A (en) * | 2019-09-30 | 2020-01-17 | 柳州钢铁股份有限公司 | Cold-rolled hot-galvanized high-strength structural steel with yield strength of 350MPa |
| EP4317514A1 (en) | 2021-04-02 | 2024-02-07 | Baoshan Iron & Steel Co., Ltd. | Hot-dipped aluminum-zinc or hot-dipped zinc-aluminum-magnesium multiphase steel having yield strength of greater than or equal to 450 mpa and rapid heat-treatment hot plating manufacturing method therefor |
| CN113481455A (en) * | 2021-07-08 | 2021-10-08 | 攀钢集团攀枝花钢钒有限公司 | Method for producing high-surface-quality zinc-aluminum-magnesium coated steel strip/plate by using air knife |
| CN114703426B (en) * | 2022-04-08 | 2023-04-28 | 马鞍山钢铁股份有限公司 | Zinc-aluminum-magnesium plated high-strength steel plate and method for efficiently producing high-strength steel plates with different strength levels |
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