CN104060168B - Cold-rolled steel sheet and preparation method thereof and hot-dip galvanizing sheet steel and preparation method thereof - Google Patents
Cold-rolled steel sheet and preparation method thereof and hot-dip galvanizing sheet steel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of preparation method of cold-rolled steel sheet, the method comprises: by slab successively through hot rolling, batch, cold rolling and annealing, wherein, consisting of of described slab: C:0.001-0.006 % by weight, Si≤0.06 % by weight, Mn:0.6-1 % by weight, P:0.05-0.1 % by weight, S:0.005-0.02 % by weight, Ti:0.01-0.04 % by weight, Nb:0.02-0.06 % by weight, Al:0.01-0.08 % by weight, surplus is Fe and inevitable impurity.The invention also discloses the cold-rolled steel sheet prepared by aforesaid method, and hot-dip galvanizing sheet steel and preparation method thereof.The present invention can obtain R
eLfor 220-280MPa, R
mfor the hot-dip galvanizing sheet steel that the intensity of 370-410MPa and forming property, surface quality are good.
Description
Technical field
The present invention relates to a kind of cold-rolled steel sheet and preparation method thereof, and the hot-dip galvanizing sheet steel obtained by this cold-rolled steel sheet and preparation method thereof.
Background technology
Along with the development of automobile industry, for the intensity of the hot dip cold-rolled steel sheet needed for vehicle body and formability performance requriements more and more higher.
CN101036968A discloses a kind of production method of deep drawing skin-passed hot-dip galvanizing sheet steel.The method used by the carbon content control of substrate in the scope of 0.003-0.006 % by weight, Ti* content is controlled in the scope of 0.02-0.04 % by weight.But the yield strength of the deep drawing skin-passed hot-dip galvanizing sheet steel of the method gained is only at below 190MPa, and intensity is lower.
CN102839322A discloses a kind of automobile hot-dip galvanizing sheet steel and production method thereof.The chemical component weight per-cent of this steel plate is: 0.001%≤C≤0.003%, 0.05%≤Mn≤0.15%, Si≤0.03%, P≤0.02%, 0.008%≤S≤0.015%, 0.02%≤Al≤0.07%, 0.05%≤Ti≤0.09%, 0.0002%≤B≤0.01%, N≤0.004%, surplus is Fe and trace element.But the yield strength of this steel plate is only at below 170MPa, tensile strength is also only at below 300MPa.
Summary of the invention
The object of the invention is to overcome existing hot-dip galvanizing sheet steel and can not have higher-strength and the defect compared with high formability energy concurrently, there is provided a kind of intensity and forming property all better and hot-dip galvanizing sheet steel of excellent surface quality and preparation method thereof, and for the preparation of the cold-rolled steel sheet and preparation method thereof of steel plate galvanized of the present invention.
To achieve these goals, the invention provides a kind of preparation method of cold-rolled steel sheet, the method comprises: by slab successively through hot rolling, batch, cold rolling and annealing, wherein,
After described hot rolling and before described batching, with the speed of cooling of 15-25 DEG C/s, the intermediate slab obtained after hot rolling is cooled to the temperature of batching;
Described temperature of batching is 720-770 DEG C;
Described cold rolling draft is 60-70%;
The condition of described annealing comprises: soaking temperature is 810-860 DEG C, and soaking time is 40-70s;
Consisting of of described slab: C:0.001-0.006 % by weight, Si≤0.06 % by weight, Mn:0.6-1 % by weight, P:0.05-0.1 % by weight, S:0.005-0.02 % by weight, Ti:0.01-0.04 % by weight, Nb:0.02-0.06 % by weight, Al:0.01-0.08 % by weight, surplus is Fe and inevitable impurity.
The present invention also provides the cold-rolled steel sheet obtained by aforesaid method.
The present invention also provides a kind of preparation method of hot-dip galvanizing sheet steel, and wherein, the method comprises above-mentioned cold-rolled steel sheet through the upper zinc coating of galvanizing attachment.
The present invention also provides the hot-dip galvanizing sheet steel obtained by the preparation method of above-mentioned hot-dip galvanizing sheet steel.
By technique scheme, the present invention can obtain one at low cost to be had finished product mechanical property and reaches yield strength R
eLfor 220-280MPa, tensile strength R
mfor 370-410MPa, elongation after fracture A
80>=32%, plastic strain ratio r
90>=1.9, work hardening exponent n
90>=0.2, more than surface quality characteristics FC level, microstructure be 100% ferritic structure, ferrite grain size be more than 10 grades and ferrite grain size is the hot-dip galvanizing sheet steel of 7-12 μm, the hot-dip galvanizing sheet steel that its particularly impact briquetting being a kind of forming property is excellent is excellent, be specially adapted to manufacture the component such as automobile stiffening plate and column, there are good market outlook.
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 microstructure picture of the hot-dip galvanizing sheet steel that embodiment 1 obtains.
Fig. 2 is the microstructure picture of the hot-dip galvanizing sheet steel that embodiment 2 obtains.
Fig. 3 is the microstructure picture of the hot-dip galvanizing sheet steel that embodiment 3 obtains.
Fig. 4 is the microstructure picture of the hot-dip galvanizing sheet steel that embodiment 4 obtains.
Fig. 5 is the microstructure picture of the hot-dip galvanizing sheet steel that comparative example 1 obtains.
Fig. 6 is the microstructure picture of the hot-dip galvanizing sheet steel that comparative example 2 obtains.
Fig. 7 is the microstructure picture of the hot-dip galvanizing sheet steel that comparative example 3 obtains.
Fig. 8 is the microstructure picture of the hot-dip galvanizing sheet steel that comparative example 4 obtains.
Fig. 9 is the microstructure picture of the hot-dip galvanizing sheet steel that comparative example 5 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 preparation method of cold-rolled steel sheet, the method comprises: by slab successively through hot rolling, batch, cold rolling and annealing, wherein, after described hot rolling and before described batching, with the speed of cooling of 15-25 DEG C/s, the intermediate slab obtained after hot rolling is cooled to the temperature of batching; Described temperature of batching is 720-770 DEG C; Described cold rolling draft is 60-70%; The condition of described annealing comprises: soaking temperature is 810-860 DEG C, and soaking time is 40-70s; Consisting of of described slab: C:0.001-0.006 % by weight, Si≤0.06 % by weight, Mn:0.6-1 % by weight, P:0.05-0.1 % by weight, S:0.005-0.02 % by weight, Ti:0.01-0.04 % by weight, Nb:0.02-0.06 % by weight, Al:0.01-0.08 % by weight, surplus is Fe and inevitable impurity.
In the present invention, although the cold-rolled steel sheet of better intensity and more excellent forming property just can be obtained when the composition of slab is in above-mentioned scope and obtained the hot-dip galvanizing sheet steel of good surface quality by this cold-rolled steel sheet, but in order to strengthen obtained cold-rolled steel sheet and the performance of hot-dip galvanizing sheet steel, under preferable case, consisting of of described slab: C:0.002-0.005 % by weight, Si:0.02-0.05 % by weight, Mn:0.65-0.9 % by weight, P:0.06-0.085 % by weight, S:0.008-0.015 % by weight, Ti:0.015-0.035 % by weight, Nb:0.03-0.055 % by weight, Al:0.03-0.065 % by weight, surplus is Fe and inevitable impurity.
In the present invention, consider the over-all properties of purity of steel and product, the carbon content in described slab needs to control in above-mentioned scope, if carbon (C) content is more than 0.006 % by weight, then the plasticity of steel plate reduces, and forming property worsens; Such as, moreover the content of silicon (Si) needs to control in lower scope, is less than 0.06 % by weight; Manganese (Mn) can increase the intensity of described slab, and can be combined into MnS with sulphur (S), prevents the thermal crack because FeS causes simultaneously, but Mn too high levels, the welding property of steel can be affected, therefore, need the content of Mn to control in above-mentioned scope.In addition, phosphorus (P), as strengthening element, needs to be added in above-mentioned scope.Consider the economy of steel making working procedure and the effect of Calcium treatment, S is controlled in the scope of 0.005-0.02 % by weight.Aluminium (Al) mainly adds as deoxidant element, realize complete deoxidation, its content requirement is more than 0.01 % by weight, but too high aluminium will affect the welding property of steel and coating adhesion and uneconomical, therefore, Al content is chosen as 0.01-0.08 % by weight and is advisable.Niobium (Nb) main fixed interval (FI) C atom, titanium (Ti) mainly fixed interval (FI) atom N, makes interstitial atom be removed, obtains pure ferrite matrix.
Described slab can adopt the known method preparing continuously cast bloom of this area to be prepared, such as can by obtaining continuously cast bloom after blast furnace ironmaking, hot metal pretreatment, converter smelting, steel ladle deoxidation, alloying furnace rear refining, LF electrically heated, RH vacuum-treat and sheet billet continuous casting as described slab of the present invention.Its condition specifically prepared is well known in the art.
In addition, in the present invention, the thickness of described slab can be about 190-205mm.
According to the present invention, described hot rolling comprises roughing and finish rolling.The start rolling temperature of described roughing can be 1170-1230 DEG C, is preferably 1185-1220 DEG C; The finishing temperature of described roughing can be 1120-1185 DEG C, is preferably 1130-1170 DEG C.In addition, the thickness of the intermediate slab after described roughing can be 34-37mm, is preferably 34-35.5mm.
In addition, the start rolling temperature of described finish rolling can be 1105-1160 DEG C, is preferably 1110-1145 DEG C; The finishing temperature of described finish rolling can be 880-950 DEG C, is preferably 895-940 DEG C; The thickness of the intermediate slab after described finish rolling can be 2-5mm, is preferably 3-4.5mm.In order to reach hot rolling roughing required for open bundle temperature, first continuously cast bloom can be heated in heater before roughing, be heated to start rolling temperature required when continuously cast bloom carries out roughing.The thickness of the intermediate slab obtained after described hot rolling is the thickness of the intermediate slab after described finish rolling here, and after namely referring to after described hot rolling that described finish rolling completes.
According to the present invention, under preferable case, after described hot rolling and before described batching, with the speed of cooling of 18-25 DEG C/s, the intermediate slab obtained after hot rolling is cooled to the temperature of batching.
According to the present invention, under preferable case, described cooling can be undertaken or air cooling by laminar flow water, preferably adopts laminar flow water cooling.
According to the present invention, under preferable case, described in the temperature of batching be 740-770 DEG C.
According to the present invention, under preferable case, described cold rolling draft is 61-68%.
According to the present invention, under preferable case, the condition of described annealing comprises: soaking temperature is 820-845 DEG C, and soaking time is 45-60s.
In order to obtain the more superior hot-dip galvanizing sheet steel of surface quality in the present invention, preferably before annealing, the cold-rolled steel sheet of gained is cleaned.Described cleaning can adopt the purging method of the steel plate of this area routine, such as alkali cleaning and/or electrolytic cleaning, its objective is that the greasy dirt in order to remove surface of cold-rolled steel plate, iron scale, iron powder etc. affect the impurity of plate surface quality.Preferably, the present invention first carries out alkali cleaning and electrolytic cleaning before being annealed by described cold-rolled steel sheet.The condition optimization of described alkali cleaning comprises: the free alkalinity of scavenging solution is 65-86Pt, and temperature is 75-90 DEG C, and the time is 50-70s.Preferably, the condition optimization of described electrolytic cleaning comprises: the free alkalinity of scavenging solution is 70-85Pt, and temperature is 70-85 DEG C, and electric current is 6800-7300A, and the time is 45-75s.
The present invention also provides the cold-rolled steel sheet obtained by above-mentioned preparation method.
The present invention also provides a kind of preparation method of hot-dip galvanizing sheet steel, and wherein, the method comprises above-mentioned cold-rolled steel sheet through the upper zinc coating of galvanizing attachment.
According to the present invention, described galvanizing 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.The condition of the preferred described galvanizing of the present invention comprises: the temperature of zinc pot is 450-470 DEG C, is more preferably 455-465 DEG C.
To the amount of the zinc coating of hot-dip galvanizing sheet steel, there is no particular limitation in the present invention, can adjust the requirement of steel plate galvanized according to concrete, preferably, on every square metre of described hot-dip galvanizing sheet steel, the weight of described zinc coating is 60-150g, be more preferably 70-130g, the zinc coating on the described hot-dip galvanizing sheet steel of every square metre here refers to the double-edged zinc coating of steel plate galvanized.
According to the present invention, described preparation method also comprises and purging the zinc melt on the steel plate taken out from zinc pot, makes the zinc coating on steel plate distribute more even, preferably adopts air knife to purge.The condition optimization that described air knife purges comprises: pressure 17-23KPa is highly 300-340mm, and the vertical range apart from steel plate is 23-28mm.
According to the present invention, described preparation method also comprises the hot-dip galvanizing sheet steel after to purging and carries out polishing and straightening, and described polishing and straightening can adopt the method for this area routine, and preferably, described polishing unit elongation is 0.4-0.8%.Preferably, described straightening unit elongation is 0.1-0.5%.More preferably only carry out straightening process to the hot-dip galvanizing sheet steel after purging, when only the hot-dip galvanizing sheet steel after purging being carried out to straightening process and do not carry out polishing process, the intensity of the steel plate that can obtain good plate shape this steel plate simultaneously can remain on R
eLfor 220-280MPa and R
mfor in the scope of 370-410MPa.
According to the present invention, the preparation method of described hot-dip galvanizing sheet steel 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, by roll coating model, surface treatment is carried out to band steel, the condition of described passivation comprises: roller coat application roll is (125-135) with the roller speed ratio dipping in liquid roller: (70-85), top roll roll-in is 80-95daN, and lower roll roll-in is 75-90daN.Under this condition, can ensure that uniform film thickness is stablized, there is no obvious aberration.
The present invention also provides the hot-dip galvanizing sheet steel obtained by aforesaid method.
The yield strength R that the hot-dip galvanizing sheet steel obtained by method of the present invention can be had
eLfor 220-280MPa, be preferably 220-260MPa; Tensile strength R
mfor 370-410MPa, be preferably 390-405MPa; Elongation after fracture A
80>=32%, be preferably 32-36%; Plastic strain ratio r
90>=1.9, be preferably 2-2.4; Work hardening exponent n
90>=0.2, be preferably 0.2-0.25; The surface quality characteristics had is more than FC level; And microstructure is the ferritic structure of 100%, ferrite grain size is more than 10 grades, be preferably 10-11 level, ferrite grain size is 7-12 μm, be preferably 7.5-11 μm, and cost is lower, the hot-dip galvanizing sheet steel that its particularly impact briquetting being a kind of forming property is excellent is excellent, be specially adapted to manufacture the component such as automobile stiffening plate and column, there are good market outlook.
Below will be described the present invention by embodiment.
In following examples and comparative example, the measuring method of the mechanical property of cold-rolled steel sheet is: yield strength ReL, tensile strength R
m, elongation after fracture A
80testing method carry out according to GBT228-2002 metallic substance tensile testing at ambient temperature; The testing method of plastic strain ratio r is carried out according to the measuring method of GBT5027-2007 metal sheet and strip plastic strain ratio (r value); The testing method of work hardening exponent n is carried out according to GBT5028-2008 metal sheet and strip tension strain hardenability value (n value) test method; The surface quality characteristics of method to hot-dip galvanizing sheet steel specified in GB/T2518-2008 is adopted to judge.
Embodiment 1
The present embodiment is for illustration of cold-rolled steel sheet of the present invention and preparation method thereof and hot-dip galvanizing sheet steel and preparation method thereof.
At converter smelting, obtain the thick slab of 200mm through LF stove Ca process, RH decarburization and continuous casting, its moiety is in table 1.This heating of plate blank to 1204 DEG C is carried out roughing, the finishing temperature of roughing is 1150 DEG C, the thickness of the intermediate slab after roughing is 34.2mm, again the intermediate slab after roughing is carried out finish rolling again by Coil Box, the starting temperature of finish rolling is 1125 DEG C, the finishing temperature of finish rolling is 921 DEG C, and the thickness of the intermediate slab after finish rolling is 3.8mm; Laminar flow water cooling is adopted to be cooled to 742 DEG C to batch the intermediate slab after hot rolling with the speed of cooling of 20 DEG C/s subsequently; Again on cold-rolling mill with the draft of 68%, be cold-rolled to the thickness of 1mm.Carry out alkali cleaning and electrolytic cleaning with by this cold-rolled steel sheet, alkali cleaning condition is: free alkalinity controls at 66Pt, and temperature is 78 DEG C, and the time is 55s; The condition of electrolytic cleaning is: free alkalinity controls at 73Pt, and temperature is 81 DEG C, and Faradaic current controls at 7000A, and the time is 49s.Then carry out anneal (under the soaking temperature of 825 DEG C, carrying out soaking 55s), then enter the zinc pot of 455 DEG C.Steel plate goes out the laggard promoting the circulation of qi cutter of zinc pot and purges, and the condition that air knife purges is: pressure 20KPa is highly 320mm, and the vertical range apart from steel plate is 24mm.Carry out straightening and chromium-free deactivation again, wherein, straightening unit elongation is 0.32%; 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 128:75, top roll roll-in is 82daN, and lower roll roll-in is 77daN.Obtain hot-dip galvanizing sheet steel thus, wherein, the cold-rolled steel sheet relative to every square metre, the weight of described zinc coating is 70g (two sides zinc coating).The strong R of surrender of gained hot-dip galvanizing sheet steel
eL, tensile strength R
m, elongation after fracture A
80, plastic strain ratio r
90with work hardening exponent n
90in table 2, the measurement result of microstructure and surface quality characteristics is in table 3, and Fig. 1 is shown in by the photo of its microstructure.
Embodiment 2
The present embodiment is for illustration of cold-rolled steel sheet of the present invention and preparation method thereof and hot-dip galvanizing sheet steel and preparation method thereof.
At converter smelting, obtain the thick slab of 200mm through LF stove Ca process, RH decarburization and continuous casting, its moiety is in table 1.This heating of plate blank to 1192 DEG C is carried out roughing, the finishing temperature of roughing is 1155 DEG C, the thickness of the intermediate slab after roughing is 34.5mm, again the intermediate slab after roughing is carried out finish rolling again by Coil Box, the starting temperature of finish rolling is 1137 DEG C, the finishing temperature of finish rolling is 936 DEG C, and the thickness of the intermediate slab after finish rolling is 4.0mm; Laminar flow water cooling is adopted to be cooled to 768 DEG C to batch the intermediate slab after hot rolling with the speed of cooling of 25 DEG C/s subsequently; Again on cold-rolling mill with the draft of 62.5%, be cold-rolled to the thickness of 1.5mm.Carry out alkali cleaning and electrolytic cleaning with by this cold-rolled steel sheet, alkali cleaning condition is: free alkalinity controls at 77Pt, and temperature is 86 DEG C, and the time is 61s; The condition of electrolytic cleaning is: free alkalinity controls at 82Pt, and temperature is 75 DEG C, and Faradaic current controls at 7300A, and the time is 64s.Then carry out anneal (under the soaking temperature of 841 DEG C, carrying out soaking 48s), then enter the zinc pot of 460 DEG C.Steel plate goes out the laggard promoting the circulation of qi cutter of zinc pot and purges, and the condition that air knife purges is: pressure 21KPa is highly 310mm, and the vertical range apart from steel plate is 25mm.Carry out straightening and chromium-free deactivation again, wherein, straightening unit elongation is 0.45%; 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 130:81, top roll roll-in is 93daN, and lower roll roll-in is 87daN.Obtain hot-dip galvanizing sheet steel thus, wherein, the cold-rolled steel sheet relative to every square metre, the weight of described zinc coating is 90g (two sides zinc coating).The strong R of surrender of gained hot-dip galvanizing sheet steel
eL, tensile strength R
m, elongation after fracture A
80, plastic strain ratio r
90with work hardening exponent n
90in table 2, the measurement result of microstructure and surface quality characteristics is in table 3, and Fig. 2 is shown in by the photo of its microstructure.
Embodiment 3
The present embodiment is for illustration of cold-rolled steel sheet of the present invention and preparation method thereof and hot-dip galvanizing sheet steel and preparation method thereof.
At converter smelting, obtain the thick slab of 199mm through LF stove Ca process, RH decarburization and continuous casting, its moiety is in table 1.This heating of plate blank to 1215 DEG C is carried out roughing, the finishing temperature of roughing is 1136 DEG C, the thickness of the intermediate slab after roughing is 34mm, again the intermediate slab after roughing is carried out finish rolling again by Coil Box, the starting temperature of finish rolling is 1107 DEG C, the finishing temperature of finish rolling is 901 DEG C, and the thickness of the intermediate slab after finish rolling is 4.0mm; Laminar flow water cooling is adopted to be cooled to 753 DEG C to batch the intermediate slab after hot rolling with the speed of cooling of 18 DEG C/s subsequently; Again on cold-rolling mill with the draft of 65%, be cold-rolled to the thickness of 1.3mm.Carry out alkali cleaning and electrolytic cleaning with by this cold-rolled steel sheet, alkali cleaning condition is: free alkalinity controls at 84Pt, and temperature is 90 DEG C, and the time is 65s; The condition of electrolytic cleaning is: free alkalinity controls at 85Pt, and temperature is 78 DEG C, and Faradaic current controls at 6800A, and the time is 71
s.Then carry out anneal (under the soaking temperature of 836 DEG C, carrying out soaking 58s), then enter the zinc pot of 465 DEG C.Steel plate goes out the laggard promoting the circulation of qi cutter of zinc pot and purges, and the condition that air knife purges is: pressure 18KPa is highly 320mm, and the vertical range apart from steel plate is 27mm.Carry out straightening and chromium-free deactivation again, wherein, straightening unit elongation is 0.29%; 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 133:85, top roll roll-in is 85daN, and lower roll roll-in is 86daN.Obtain hot-dip galvanizing sheet steel thus, wherein, the cold-rolled steel sheet relative to every square metre, the weight of described zinc coating is 130g (two sides zinc coating).The strong R of surrender of gained hot-dip galvanizing sheet steel
eL, tensile strength R
m, elongation after fracture A
80, plastic strain ratio r
90with work hardening exponent n
90in table 2, the measurement result of microstructure and surface quality characteristics is in table 3, and Fig. 3 is shown in by the photo of its microstructure.
Embodiment 4
According to the method for embodiment 1, difference is, the steel plate after being purged by air knife first carries out polishing before carrying out straightening, and polishing elongation control is 0.69%, the strong R of surrender of gained hot-dip galvanizing sheet steel
eL, tensile strength R
m, elongation after fracture A
80, plastic strain ratio r
90with work hardening exponent n
90in table 2, the measurement result of microstructure and surface quality characteristics is in table 3, and Fig. 4 is shown in by the photo of its microstructure.
Comparative example 1
According to the method for embodiment 1, difference is, the moiety of slab is different, is specifically shown in Table 1, the strong R of surrender of gained hot-dip galvanizing sheet steel
eL, tensile strength R
m, elongation after fracture A
80, plastic strain ratio r
90with work hardening exponent n
90in table 2, the measurement result of microstructure and surface quality characteristics is in table 3, and Fig. 5 is shown in by the photo of its microstructure.
Comparative example 2
According to the method for embodiment 1, difference is, with the speed of cooling of 50 DEG C/s, the intermediate slab after hot rolling is cooled to 742 DEG C and batches, the strong R of surrender of gained hot-dip galvanizing sheet steel
eL, tensile strength R
m, elongation after fracture A
80, plastic strain ratio r
90with work hardening exponent n
90in table 2, the measurement result of microstructure and surface quality characteristics is in table 3, and Fig. 6 is shown in by the photo of its microstructure.
Comparative example 3
According to the method for embodiment 1, difference is, coiling temperature is 785 DEG C, the strong R of surrender of gained hot-dip galvanizing sheet steel
eL, tensile strength R
m, elongation after fracture A
80, plastic strain ratio r
90with work hardening exponent n
90in table 2, the measurement result of microstructure and surface quality characteristics is in table 3, and Fig. 7 is shown in by the photo of its microstructure.
Comparative example 4
Method according to embodiment 1, difference is, cold rolling draft is 50%, the strong R of surrender of gained hot-dip galvanizing sheet steel
eL, tensile strength R
m, elongation after fracture A
80, plastic strain ratio r
90with work hardening exponent n
90in table 2, the measurement result of microstructure and surface quality characteristics is in table 3, and Fig. 8 is shown in by the photo of its microstructure.
Comparative example 5
Method according to embodiment 1, difference is, the soaking temperature of described annealing is 780 DEG C, the strong R of surrender of gained hot-dip galvanizing sheet steel
eL, tensile strength R
m, elongation after fracture A
80, plastic strain ratio r
90with work hardening exponent n
90in table 2, the measurement result of microstructure and surface quality characteristics is in table 3, and Fig. 9 is shown in by the photo of its microstructure.
Table 1
Table 2
Note: "---" in table represents the non-perfect recrystallization of steel plate, and during tension test, sample breaks in advance, cannot measure n, r value.
Table 3
Note: "---" in table represents the non-perfect recrystallization of microstructure, cannot pass judgment on according to metallographic structure standard.
Can be found out by the data in table 1-3, adopt preparation method of the present invention, can obtain and there is finished product mechanical property reach yield strength R
eLfor 220-280MPa, tensile strength R
mfor 370-410MPa, elongation after fracture A
80>=32%, plastic strain ratio r
90>=1.9, work hardening exponent n
90>=0.2, more than surface quality characteristics FC level, microstructure be 100% ferritic structure, ferrite grain size be more than 10 grades and ferrite grain size is the hot-dip galvanizing sheet steel of 7-12 μm.
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 (8)
1. the preparation method of a hot-dip galvanizing sheet steel, it is characterized in that, the method comprises prepares cold-rolled steel sheet, and by this cold-rolled steel sheet through the upper zinc coating of galvanizing attachment, the preparation method of described cold-rolled steel sheet comprises: by slab successively through hot rolling, batch, cold rolling and annealing
After described hot rolling and before described batching, with the speed of cooling of 15-25 DEG C/s, the intermediate slab obtained after hot rolling is cooled to the temperature of batching;
Described temperature of batching is 720-770 DEG C;
Described cold rolling draft is 60-70%;
The condition of described annealing comprises: soaking temperature is 810-860 DEG C, and soaking time is 40-70s;
Consisting of of described slab: C:0.002-0.005 % by weight, Si:0.02-0.05 % by weight, Mn:0.65-0.9 % by weight, P:0.06-0.085 % by weight, S:0.008-0.015 % by weight, Ti:0.015-0.035 % by weight, Nb:0.03-0.055 % by weight, Al:0.03-0.065 % by weight, surplus is Fe and inevitable impurity;
The method also comprises only carries out straightening process to the hot-dip galvanizing sheet steel after purging and does not carry out polishing process.
2. method according to claim 1, wherein, after described hot rolling and before described batching, is cooled to the temperature of batching by the intermediate slab obtained after hot rolling with the speed of cooling of 18-25 DEG C/s.
3. method according to claim 1 and 2, wherein, described in the temperature of batching be 740-770 DEG C.
4. method according to claim 1, wherein, described cold rolling draft is 61-68%.
5. method according to claim 1, wherein, the condition of described annealing comprises: soaking temperature is 820-845 DEG C, and soaking time is 45-60s.
6. method according to claim 1, wherein, described hot rolling comprises roughing and finish rolling, and the start rolling temperature of described roughing is 1170-1230 DEG C, and the finishing temperature of described roughing is 1120-1185 DEG C; The start rolling temperature 1105-1160 DEG C of described finish rolling, the finishing temperature of described finish rolling is 880-950 DEG C.
7. method according to claim 1, wherein, on every square metre of described hot-dip galvanizing sheet steel, the weight of described zinc coating is 60-150g.
8. by the hot-dip galvanizing sheet steel that the method in claim 1-7 described in any one is obtained.
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