CN104131144B - 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 provides 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.The preparation method of described cold-rolled steel sheet comprises: by slab successively through hot rolling, batch, cold rolling and annealing, wherein, after described hot rolling and before 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 coiling temperature is 690-720 DEG C; Described cold rolling draft is 75-85%; The condition of described annealing comprises: temperature is 830-880 DEG C, and the time is 40-70s; Consisting of of described slab: C:0.001-0.004 % by weight, Si:0.01-0.03 % by weight, Mn:0.1-0.3 % by weight, P :≤0.018 % by weight, S :≤0.02 % by weight, Al:0.01-0.07 % by weight, Ti:0.045%-0.075 % by weight; Nb:0.01%-0.025 % by weight, surplus is iron and inevitable impurity.According to the present invention, can provide a kind of yield strength within the scope of 130-160MPa, the excellent and good hot-dip galvanizing sheet steel of surface quality of impact briquetting performance.
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, prepare automobile, motorcycle field deep-drawing and be shaped on extremely complicated corrosion resistant component, need certain yield strength and the excellent steel plate of impact briquetting performance, and need the excellent surface quality of the hot-dip galvanizing sheet steel obtained by this steel plate.
At present, as the method for the special ultra-deep punching cold-rolling steel sheet of preparation, CN101514392A discloses the continuous annealing process of a kind of deep-draw and extra-deep drawing sheet steel.This technique comprises: steel plate through cleaning, enters continuous annealing furnace, speed 150 ~ 350m/min before annealing, adopts nitrogen hydrogen mixeding gas ejection surface of steel plate, to protect, anti-oxidation, make steel billet temperature be heated to 120 ~ 180 DEG C simultaneously to steel plate; Again to steel plate heating, make its temperature reach 750 ~ 780 DEG C, and be incubated 40 ~ 70s; Then 400 ~ 460 DEG C are cooled to steel plate, and are incubated 60 ~ 300s and carry out Wetted constructures, be cooled to normal temperature subsequently.Owing to adopting overaging annealing process, the carbide in steel is fully separated out, ensure that household electrical appliances steel plate and auto sheet punching performance and ultra-deep punching performance.But the impact briquetting performance of the steel plate obtained by this technique also needs further raising.
Summary of the invention
The object of the invention is to overcome the defect that the impact briquetting performance of existing steel plate galvanized is good not enough, a kind of yield strength R is provided
eLwithin the scope of 130-160MPa, the excellent and good hot-dip galvanizing sheet steel of surface quality and preparation method thereof of impact briquetting performance, 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 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 coiling temperature is 690-720 DEG C;
Described cold rolling draft is 75-85%;
The condition of described annealing comprises: temperature is 830-880 DEG C, and the time is 40-70s;
Consisting of of described slab: C:0.001-0.004 % by weight, Si:0.01-0.03 % by weight, Mn:0.1-0.3 % by weight, P :≤0.018 % by weight, S :≤0.02 % by weight, Al:0.01-0.07 % by weight, Ti:0.045-0.075 % by weight; Nb:0.01-0.025 % by weight, surplus is iron 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 invention provides a kind of yield strength R
eLfor 130-160MPa, tensile strength R
mfor 280-320MPa, elongation after fracture A
80>=44%, plastic strain ratio r
90>=2.5, work hardening exponent n
90>=0.25 and surface quality characteristics be the hot-dip galvanizing sheet steel of more than FC level.And the microstructure of finished steel plate be 100% ferritic structure, ferrite grain size is more than 8.0 grades and ferrite grain size is 18-22 μm, be especially suitable for use as automobile, the deep-drawing of motorcycle field and the steel plate of the extremely complicated corrosion resistant component that are shaped, there are excellent 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 comparative example 1 obtains.
Fig. 5 is the microstructure picture of the hot-dip galvanizing sheet steel that comparative example 2 obtains.
Fig. 6 is the microstructure picture of the hot-dip galvanizing sheet steel that comparative example 3 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 preparation method of cold-rolled steel sheet provided by the invention comprises: by slab successively through hot rolling, batch, cold rolling and annealing, wherein, after described hot rolling and before 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 coiling temperature is 690-720 DEG C; Described cold rolling draft is 75-85%; The condition of described annealing comprises: temperature is 830-880 DEG C, and the time is 40-70s; Described slab consist of C:0.001-0.004 % by weight, Si:0.01-0.03 % by weight, Mn:0.1-0.3 % by weight, P :≤0.018 % by weight, S :≤0.02 % by weight, Al:0.01-0.07 % by weight, Ti:0.045-0.075 % by weight; Nb:0.01-0.025 % by weight, surplus is iron and inevitable impurity.
In the present invention, although the cold-rolled steel sheet of 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:0.001-0.003 % by weight, Si:0.01-0.025 % by weight, Mn:0.15-0.25 % by weight, P:0.005-0.015 % by weight, S:0.005-0.015 % by weight, Al:0.025-0.065 % by weight, Ti:0.055-0.075 % by weight, Nb:0.010-0.02 % by weight, surplus is iron and inevitable impurity.
According to the present invention, described slab can adopt the known method preparing continuously cast bloom of this area to be prepared, such as can by obtaining described 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.Its condition specifically prepared is well known in the art.Described slab suitably can be selected according to product to be prepared, such as, can be 190-210mm.
According to the present invention, described hot rolling comprises roughing and finish rolling.Preferably, the start rolling temperature of described roughing is 1130-1200 DEG C, is more preferably 1140-1185 DEG C.Preferably, the finishing temperature of described roughing is 1090-1160 DEG C, is more preferably 1100-1145 DEG C.In addition, in order to reach hot rolling roughing required for starting temperature, first continuously cast bloom can be heated in heater before roughing, be heated to temperature required when continuously cast bloom carries out roughing.
Preferably, the thickness of the intermediate slab after described roughing is 31-36mm, is more preferably 33-35mm.
Preferably, the start rolling temperature 1075-1150 DEG C of described finish rolling, is more preferably 1090-1130 DEG C.Preferably, the finishing temperature of described finish rolling is 880-910 DEG C, is more preferably 890-910 DEG C.
Preferably, the thickness of the intermediate slab after described finish rolling is 2-5mm, is more preferably 3-5mm.
According to the present invention, under preferable case, after described hot rolling and before batching, with the speed of cooling of 17-23 DEG C/s, the intermediate slab obtained after hot rolling is cooled to the temperature of batching.After being described finish rolling after described hot rolling.
According to the present invention, under preferable case, the type of cooling of above-mentioned cooling is laminar flow water cooling.
According to the present invention, under preferable case, described in the temperature of batching be 690-720 DEG C, in preferred situation, described in the temperature of batching be 695-715 DEG C.
According to the present invention, under preferable case, described cold rolling draft is 73-80%.
According to the present invention, under preferable case, the condition of described annealing comprises: temperature is 850-880 DEG C, and the time is 55-70s.
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 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 condition optimization of described alkali cleaning comprises: the free alkalinity of scavenging solution is 60-90Pt, and temperature is 65-80 DEG C, and the time is 40-70s.More preferably, the condition optimization of described alkali cleaning comprises: the free alkalinity of scavenging solution is 72-83Pt, and temperature is 73-78 DEG C, and the time is 45-65s.Preferably, the condition optimization of described electrolytic cleaning comprises: the free alkalinity of scavenging solution is 65-85Pt, and temperature is 70-90 DEG C, and electric current is 6500-7500A, and the time is 45-75s.More preferably, the condition optimization of described electrolytic cleaning comprises: the free alkalinity of scavenging solution is 80-83Pt, and temperature is 75-87 DEG C, and electric current is 6900-7300A, and the time is 50-70s.
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 440-480 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 80-120g, and 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 12-20KPa is highly 250-350mm, and the vertical range apart from steel plate is 22-30mm.
According to the present invention, described preparation method also comprises the hot-dip galvanizing sheet steel after to purging and carries out straightening, and described straightening can adopt the method for this area routine, and preferably, described straightening unit elongation is 0.1-0.5%.
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, and carry out surface treatment by roll coating model to band steel, the condition of described passivation comprises: roller coat application roll is 130:(55-80 with the roller speed ratio dipping in liquid roller), be preferably 130:70; Top roll roll-in is 50-110daN; Lower roll roll-in is 70-140daN.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.
By method of the present invention, by technique scheme, the invention provides a kind of yield strength R
eLfor 130-160MPa (being preferably 140-160MPa), tensile strength R
mfor 280-320MPa (being preferably 290-300MPa), elongation after fracture A
80>=44% (being preferably 44-46%), plastic strain ratio r
90>=2.5 (being preferably 2.5-2.7), work hardening exponent n
90>=0.25 (being preferably 0.25-0.27) and surface quality characteristics are the hot-dip galvanizing sheet steel of more than FC level.And the microstructure of finished steel plate be 100% ferritic structure, ferrite grain size is more than 8.0 grades and ferrite grain size is 18-22 μ μm, be especially suitable for use as automobile, the deep-drawing of motorcycle field and the steel plate of the extremely complicated corrosion resistant component that are shaped, there are excellent market outlook.
Below will be described the present invention by embodiment.
In following examples and comparative example, yield strength R
eL, tensile strength R
m, elongation after fracture A
80testing method carry out according to GBT228-2002 metallic substance tensile testing at ambient temperature; Plastic strain ratio r
90testing method carry out according to the measuring method of GBT5027-2007 metal sheet and strip plastic strain ratio (r value); Work hardening exponent n
90testing method carry 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 slab of the present invention (thickness is 200mm) through LF stove Ca process, RH decarburization and continuous casting, its moiety is in table 1.This heating of plate blank to 1161 DEG C is carried out roughing, the finishing temperature of roughing is 1123 DEG C, the thickness of the intermediate slab after roughing is 34mm, intermediate slab after roughing is batched by Coil Box, then finish rolling is carried out, the start rolling temperature of finish rolling is 1094 DEG C, and the finishing temperature of finish rolling is 898 DEG C, and the thickness of the intermediate slab after finish rolling is 4mm; After being cooled to 701 DEG C with the cooling rate of 18 DEG C/s subsequently, (type of cooling is laminar flow water cooling) batches; Then, after being cooled to room temperature (25 DEG C), with the draft of 80% on cold-rolling mill, the thickness of 0.8mm is cold-rolled to.Then this steel plate is carried out alkali cleaning and electrolytic cleaning, alkali cleaning condition is: free alkalinity controls at 80Pt, and temperature is 83 DEG C, and the time is 55s; The condition of electrolytic cleaning is: free alkalinity controls at 65Pt, and temperature is 85 DEG C, and Faradaic current controls at 7300A, and the time is 60s.Then anneal 68s at 866 DEG C, obtains cold-rolled steel sheet after cooling.Then, the cold-rolled steel sheet obtained is made to 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 15KPa is highly 300mm, and the vertical range apart from steel plate is 25mm.Carry out straightening and chromium-free deactivation again, wherein, straightening unit elongation 0.35%; 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 and the roller speed ratio 130:70 dipping in liquid roller, top roll roll-in is 80daN, and lower roll roll-in is 85daN.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 100g (zinc coating on two sides).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
90, work hardening exponent n
90with the measurement result of surface quality characteristics in table 2, Fig. 1 is shown in by the photo of its microstructure, the results are shown in Table 2.
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 slab of the present invention (thickness is 200mm) through LF stove Ca process, RH decarburization and continuous casting, its moiety is in table 1.This heating of plate blank to 1145 DEG C is carried out roughing, the finishing temperature of roughing is 1102 DEG C, the thickness of the intermediate slab after roughing is 34.4mm, intermediate slab after roughing is batched by Coil Box, then finish rolling is carried out, the start rolling temperature of finish rolling is 1094 DEG C, and the finishing temperature of finish rolling is 905 DEG C, and the thickness of the intermediate slab after finish rolling is 4mm; After being cooled to 696 DEG C with the cooling rate of 22 DEG C/s subsequently, (type of cooling is laminar flow water cooling) batches; Then, after being cooled to room temperature (25 DEG C), with the draft of 75% on cold-rolling mill, the thickness of 1mm is cold-rolled to.Then this cold-rolled steel sheet is carried out alkali cleaning and electrolytic cleaning, alkali cleaning condition is: free alkalinity controls at 71Pt, and temperature is 75 DEG C, and the time is 47s; The condition of electrolytic cleaning is: free alkalinity controls at 83Pt, and temperature is 74 DEG C, and Faradaic current controls at 7000A, and the time is 49s.Then anneal 60s at 878 DEG C, obtains cold-rolled steel sheet after cooling.Then, the cold-rolled steel sheet obtained is made to enter the zinc pot of 462 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 28mm.Carry out straightening and chromium-free deactivation again, wherein, straightening unit elongation 0.21%; 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 and the roller speed ratio 130:78 dipping in liquid roller, top roll roll-in is 75daN, and lower roll roll-in is 110daN.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 120g (zinc coating on two sides).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
90, work hardening exponent n
90with the measurement result of surface quality characteristics in table 2, Fig. 2 is shown in by the photo of its microstructure, the results are shown in Table 2.
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 slab of the present invention (thickness is 200mm) through LF stove Ca process, RH decarburization and continuous casting, its moiety is in table 1.This heating of plate blank to 1182 DEG C is carried out roughing, the finishing temperature of roughing is 1143 DEG C, the thickness of the intermediate slab after roughing is 34.6mm, intermediate slab after roughing is batched by Coil Box, then finish rolling is carried out, the start rolling temperature of finish rolling is 1128 DEG C, and the finishing temperature of finish rolling is 908 DEG C, and the thickness of the intermediate slab after finish rolling is 4.5mm; After being cooled to 715 DEG C with the cooling rate of 20 DEG C/s subsequently, (type of cooling is laminar flow water cooling) batches; Then, after being cooled to room temperature (25 DEG C), with the draft of 73.3% on cold-rolling mill, the thickness of 1.2mm is cold-rolled to.Then this cold-rolled steel sheet is carried out alkali cleaning and electrolytic cleaning, alkali cleaning condition is: free alkalinity controls at 77Pt, and temperature is 79 DEG C, and the time is 52s; The condition of electrolytic cleaning is: free alkalinity controls at 72Pt, and temperature is 81 DEG C, and Faradaic current controls at 7400A, and the time is 70s.Then anneal 55s at 852 DEG C, obtains cold-rolled steel sheet after cooling.Then, the cold-rolled steel sheet obtained is made to 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 13KPa is highly 280mm, and the vertical range apart from steel plate is 23mm.Carry out straightening and chromium-free deactivation again, wherein, straightening unit elongation 0.47%; 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 and the roller speed ratio 130:60 dipping in liquid roller, top roll roll-in is 90daN, and lower roll roll-in is 100daN.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 85g (zinc coating on two sides).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
90, work hardening exponent n
90with the measurement result of surface quality characteristics in table 2, Fig. 3 is shown in by the photo of its microstructure, the results are shown in Table 2.
Comparative example 1
Carry out 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
90, work hardening exponent n
90with the measurement result of surface quality characteristics in table 2, Fig. 4 is shown in by the photo of its microstructure, the results are shown in Table 2.
Comparative example 2
Method according to embodiment 1 is carried out, and difference is, coiling temperature is 650 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
90, work hardening exponent n
90with the measurement result of surface quality characteristics in table 2, Fig. 5 is shown in by the photo of its microstructure, the results are shown in Table 2.
Comparative example 3
Method according to embodiment 1 is carried out, and difference is, anneal 68s at 820 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
90, work hardening exponent n
90with the measurement result of surface quality characteristics in table 2, Fig. 6 is shown in by the photo of its microstructure, the results are shown in Table 2.
Table 1
Note: surplus is iron and inevitable impurity
Table 2
Note :-
*1 represents that tension specimen testing process sample breaks in advance, cannot measure n value and r value;-
*2 expressions are organized as non-perfect recrystallization tissue, cannot measure grain fineness number and grain-size.
Can be found out by the data in table 1 and table 2, adopt preparation method of the present invention, one can be obtained and there is finished product mechanical property reach yield strength R
eLfor 130-160MPa, the excellent and good hot-dip galvanizing sheet steel of surface quality of impact briquetting performance.
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 (9)
1. a preparation method for cold-rolled steel sheet, the method comprises: by slab successively through hot rolling, batch, cold rolling and annealing, it is characterized in that,
After described hot rolling and before 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 coiling temperature is 690-720 DEG C;
Described cold rolling draft is 75-85%;
The condition of described annealing comprises: temperature is 830-880 DEG C, and the time is 40-70s;
Consisting of of described slab: C:0.001-0.003 % by weight, Si:0.01-0.025 % by weight, Mn:0.15-0.25 % by weight, P:0.005-0.015 % by weight, S:0.005-0.015 % by weight, Al:0.025-0.065 % by weight, Ti:0.055-0.075 % by weight; Nb:0.010-0.02 % by weight, surplus is iron and inevitable impurity.
2. method according to claim 1, wherein, described hot rolling comprises roughing and finish rolling, and the start rolling temperature of described roughing is 1130-1200 DEG C, and the finishing temperature of described roughing is 1090-1160 DEG C; The start rolling temperature 1075-1150 DEG C of described finish rolling, the finishing temperature of described finish rolling is 880-910 DEG C.
3. method according to claim 2, wherein, the thickness of the intermediate slab after described finish rolling is 2-5mm.
4. method according to claim 2, wherein, after described hot rolling and before batching, is cooled to the temperature of batching by the intermediate slab obtained after hot rolling with the speed of cooling of 17-23 DEG C/s.
5. the method according to claim 1 or 4, wherein, described in the temperature of batching be 690-720 DEG C.
6. method according to claim 1, wherein, described cold rolling draft is 73-80%.
7. method according to claim 1, wherein, the condition of described annealing comprises: temperature is 850-880 DEG C, and the time is 55-70s.
8. a preparation method for hot-dip galvanizing sheet steel, is characterized in that, the method comprises: the step being prepared cold-rolled steel sheet by the method in claim 1-7 described in any one, and the cold-rolled steel sheet obtained is adhered to the step of upper zinc coating through galvanizing.
9. preparation method according to claim 8, wherein, on every square metre of described hot-dip galvanizing sheet steel, the weight of described zinc coating is 80-120g.
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| CN101255529A (en) * | 2008-03-06 | 2008-09-03 | 武汉钢铁(集团)公司 | High plastic-strain ratio galvanized steel sheet and production method |
| CN101684533A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | High strength cold-rolled plate with excellent formability and production method thereof |
| CN103045833A (en) * | 2011-10-11 | 2013-04-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel plate and galvanizing steel plate, and preparation method thereof |
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2014
- 2014-07-16 CN CN201410337067.4A patent/CN104131144B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101255529A (en) * | 2008-03-06 | 2008-09-03 | 武汉钢铁(集团)公司 | High plastic-strain ratio galvanized steel sheet and production method |
| CN101684533A (en) * | 2008-09-27 | 2010-03-31 | 鞍钢股份有限公司 | High strength cold-rolled plate with excellent formability and production method thereof |
| CN103045833A (en) * | 2011-10-11 | 2013-04-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel plate and galvanizing steel plate, and preparation method thereof |
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