CN104131144A - Cold-rolled steel plate, making method of cold-rolled steel plate, galvanized steel plate and making method of galvanized steel plate - Google Patents
Cold-rolled steel plate, making method of cold-rolled steel plate, galvanized steel plate and making method of galvanized steel plate Download PDFInfo
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Abstract
The invention provides a cold-rolled steel plate, a making method of the cold-rolled steel plate, a galvanized steel plate made by using the cold-rolled steel plate, and a making method of the galvanized steel plate. The making method of the cold-rolled steel plate comprises the following steps: carrying out hot rolling on a plate blank, reeling, carrying out cold rolling, and annealing, wherein the intermediate plate blank obtained after hot rolling is cooled under a cooling speed of 15-25DEG C/s after the hot rolling and before reeling to a reeling temperature; the reeling temperature is 690-720DEG C; the reduction of the cold rolling is 75-85%; annealing conditions comprise the temperature of 830-880DEG C and the time of 40-70s; and the plate blank comprises 0.001-0.004wt% of C, 0.01-0.03wt% of Si, 0.1-0.3wt% of Mn, 0.018wt% or less of P, 0.02wt% or less of S, 0.01-0.07wt% of Al, 0.045-0.075wt% of Ti, 0.01-0.025wt% of Nb, and the balance Fe and inevitable impurities. The galvanized steel plate provided in the invention has the advantages of yield strength in a range of 130-160MPa, excellent stamping forming performance and good surface quality.
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 being made by this cold-rolled steel sheet and preparation method thereof.
Background technology
Along with the development of automobile industry, preparing the deep-drawing of automobile, motorcycle field and be shaped on extremely complicated corrosion resistant component, need certain yield strength and the good steel plate of impact briquetting performance, and the excellent surface quality of the hot-dip galvanizing sheet steel that need to be 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 before annealing, and speed 150～350m/min adopts nitrogen hydrogen mixeding gas ejection surface of steel plate, to steel plate protect, anti-oxidation, make steel billet temperature be heated to 120～180 DEG C simultaneously; Again, to steel plate heating, make its temperature reach 750～780 DEG C, and be incubated 40～70s; Then steel plate is cooled to 400～460 DEG C, and is incubated 60～300s and carries out overaging processing, be cooled to subsequently normal temperature.Owing to adopting overaging annealing process, the carbide in steel is fully separated out, ensure household electrical appliances steel plate and auto sheet punching performance and super deep drawability.But the impact briquetting performance of the steel plate obtaining by this technique also needs further raising.
Summary of the invention
The good not enough defect of impact briquetting performance that the object of the invention is to overcome existing steel plate galvanized, provides a kind of yield strength R
eLwithin the scope of 130-160MPa, the good and good hot-dip galvanizing sheet steel of surface quality of impact briquetting performance and preparation method thereof, and for the preparation of cold-rolled steel sheet of steel plate galvanized of the present invention and preparation method thereof.
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, the intermediate slab obtaining is cooled to the temperature of batching with the speed of cooling of 15-25 DEG C/s after hot rolling;
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 being made by aforesaid method.
The present invention also provides a kind of preparation method of hot-dip galvanizing sheet steel, and wherein, the method comprises adheres to upper zinc coating by above-mentioned cold-rolled steel sheet through galvanizing.
The present invention also provides the hot-dip galvanizing sheet steel being made 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 be characterized as hot-dip galvanizing sheet steel more than FC level.And the ferritic structure that the microstructure of finished steel plate is 100%, ferrite grain size are that 8.0 grades of above and ferrite grain sizes are 18-22 μ m, be especially suitable for use as the deep-drawing of automobile, motorcycle field and the extremely steel plate of complicated corrosion resistant component that is shaped, there are good market outlook.
Other features and advantages of the present invention are described in detail the embodiment part subsequently.
Brief description of the drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for specification sheets, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the microstructure picture of the hot-dip galvanizing sheet steel that makes of embodiment 1.
Fig. 2 is the microstructure picture of the hot-dip galvanizing sheet steel that makes of embodiment 2.
Fig. 3 is the microstructure picture of the hot-dip galvanizing sheet steel that makes of embodiment 3.
Fig. 4 is the microstructure picture of the hot-dip galvanizing sheet steel that makes of comparative example 1.
Fig. 5 is the microstructure picture of the hot-dip galvanizing sheet steel that makes of comparative example 2.
Fig. 6 is the microstructure picture of the hot-dip galvanizing sheet steel that makes of comparative example 3.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
The 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, the intermediate slab obtaining is cooled to the temperature of batching with the speed of cooling of 15-25 DEG C/s after hot rolling; 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 just can obtain the cold-rolled steel sheet of better forming property and be made the hot-dip galvanizing sheet steel of good surface quality by this cold-rolled steel sheet in the time that the composition of slab is in above-mentioned scope, but in order to strengthen the performance of obtained cold-rolled steel sheet and 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 of preparing continuously cast bloom of this area to be prepared, for example can be 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.The condition of its concrete preparation is well known in the art.Described slab can suitably be selected according to product to be prepared, for example, 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, more preferably 1140-1185 DEG C.Preferably, the finishing temperature of described roughing is 1090-1160 DEG C, more preferably 1100-1145 DEG C.In addition, in order to reach the needed starting temperature of roughing of hot rolling, can before roughing, first continuously cast bloom be heated in heater to required temperature when being heated to continuously cast bloom and carrying out roughing.
Preferably, the thickness of the intermediate slab after described roughing is 31-36mm, more preferably 33-35mm.
Preferably, the start rolling temperature 1075-1150 DEG C of described finish rolling, more preferably 1090-1130 DEG C.Preferably, the finishing temperature of described finish rolling is 880-910 DEG C, more preferably 890-910 DEG C.
Preferably, the thickness of the intermediate slab after described finish rolling is 2-5mm, more preferably 3-5mm.
According to the present invention, under preferable case, after described hot rolling and before batching, the intermediate slab obtaining is cooled to the temperature of batching with the speed of cooling of 17-23 DEG C/s after hot rolling.After being described finish rolling after described hot rolling.
According to the present invention, under preferable case, the above-mentioned cooling type of 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 the present invention, in order to obtain the hot-dip galvanizing sheet steel that surface quality is more superior, preferably before annealing, the cold-rolled steel sheet to gained cleans.Described cleaning can adopt the purging method of the steel plate of this area routine, and for example alkali cleaning and electrolytic cleaning its objective is that 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 being made 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 adheres to upper zinc coating by above-mentioned cold-rolled steel sheet through galvanizing.
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, more preferably 455-465 DEG C.
The amount of the zinc coating of the present invention to hot-dip galvanizing sheet steel there is no special restriction, can adjust according to the concrete requirement to steel plate galvanized, 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 here every square metre refers to the double-edged zinc coating of steel plate galvanized.
According to the present invention, described preparation method also comprises that the zinc melt on the steel plate to taking out from zinc pot purges, and makes the zinc coating on steel plate distribute more evenly, preferably adopts air knife to purge.The condition optimization that described air knife purges comprises: pressure 12-20KPa is highly 250-350mm, is 22-30mm apart from the vertical range of steel plate.
According to the present invention, described preparation method also comprise to purge after hot-dip galvanizing sheet steel carry out straightening, described straightening can adopt the method for this area routine, 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 conventionally also comprises the steel plate of gained carried out to passivation, and the present invention preferably adopts chromium-free deactivation.Method to described passivation is not particularly limited, and can be the passivating method of this area routine.Preferably, described passivation, for adopting environmental protection chromium-free passivation liquid, is carried out surface treatment by roll coating model to band steel, and the condition of described passivation comprises: roller coat application roll is 130:(55-80 with the roller speed ratio that dips 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 stable, there is no obvious aberration.
The present invention also provides the hot-dip galvanizing sheet steel being made 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 are characterized as hot-dip galvanizing sheet steel more than FC level.And the ferritic structure that the microstructure of finished steel plate is 100%, ferrite grain size are that 8.0 grades of above and ferrite grain sizes are 18-22 μ μ m, be especially suitable for use as the deep-drawing of automobile, motorcycle field and the extremely steel plate of complicated corrosion resistant component that is shaped, there are good market outlook.
Below will describe 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; Adopt the method specifying in GB/T2518-2008 to judge the surface quality feature of hot-dip galvanizing sheet steel.
Embodiment 1
The present embodiment is used for illustrating cold-rolled steel sheet of the present invention and preparation method thereof and hot-dip galvanizing sheet steel and preparation method thereof.
Converter smelting, through LF stove Ca process, RH decarburization and continuous casting obtain slab of the present invention (thickness is 200mm), its moiety is in table 1.This heating of plate blank to 1161 DEG C is carried out to 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 carry out finish rolling, 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; Be cooled to (type of cooling is as laminar flow water cooling) after 701 DEG C to batch taking the cooling rate of 18 DEG C/s subsequently; Then be cooled to after room temperature (25 DEG C), on cold-rolling mill, with 80% draft, be cold-rolled to the thickness of 0.8mm.Then this steel plate is carried out to alkali cleaning and electrolytic cleaning, alkali cleaning condition is: free alkalinity is controlled at 80Pt, and temperature is 83 DEG C, and the time is 55s; The condition of electrolytic cleaning is: free alkalinity is controlled at 65Pt, and temperature is 85 DEG C, and Faradaic current is controlled at 7300A, and the time is 60s.Then the 68s that anneals at 866 DEG C, obtains cold-rolled steel sheet after cooling.Then the cold-rolled steel sheet that, makes to obtain enters 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, is 25mm apart from the vertical range of steel plate.Carry out again straightening and chromium-free deactivation, wherein, straightening unit elongation 0.35%; The condition of passivation comprises: roller coating machine is delivered to application roll by dipping in liquid roller by environment-friendly chromium-free passivating solution, then is rotated and be evenly coated in surface of steel plate by application roll.Roller coat application roll and the roller speed ratio 130:70 that dips in liquid roller, top roll roll-in is 80daN, lower roll roll-in is 85daN.Obtain thus hot-dip galvanizing sheet steel, wherein, with respect to the cold-rolled steel sheet of 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
90in table 2, Fig. 1 is shown in by the photo of its microstructure, the results are shown in Table 2 with the measurement result of surface quality feature.
Embodiment 2
The present embodiment is used for illustrating cold-rolled steel sheet of the present invention and preparation method thereof and hot-dip galvanizing sheet steel and preparation method thereof.
Converter smelting, through LF stove Ca process, RH decarburization and continuous casting obtain slab of the present invention (thickness is 200mm), its moiety is in table 1.This heating of plate blank to 1145 DEG C is carried out to 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 carry out finish rolling, 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; Be cooled to (type of cooling is as laminar flow water cooling) after 696 DEG C to batch taking the cooling rate of 22 DEG C/s subsequently; Then be cooled to after room temperature (25 DEG C), on cold-rolling mill, with 75% draft, be cold-rolled to the thickness of 1mm.Then this cold-rolled steel sheet is carried out to alkali cleaning and electrolytic cleaning, alkali cleaning condition is: free alkalinity is controlled at 71Pt, and temperature is 75 DEG C, and the time is 47s; The condition of electrolytic cleaning is: free alkalinity is controlled at 83Pt, and temperature is 74 DEG C, and Faradaic current is controlled at 7000A, and the time is 49s.Then the 60s that anneals at 878 DEG C, obtains cold-rolled steel sheet after cooling.Then the cold-rolled steel sheet that, makes to obtain enters 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, is 28mm apart from the vertical range of steel plate.Carry out again straightening and chromium-free deactivation, wherein, straightening unit elongation 0.21%; The condition of passivation comprises: roller coating machine is delivered to application roll by dipping in liquid roller by environment-friendly chromium-free passivating solution, then is rotated and be evenly coated in surface of steel plate by application roll.Roller coat application roll and the roller speed ratio 130:78 that dips in liquid roller, top roll roll-in is 75daN, lower roll roll-in is 110daN.Obtain thus hot-dip galvanizing sheet steel, wherein, with respect to the cold-rolled steel sheet of 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
90in table 2, Fig. 2 is shown in by the photo of its microstructure, the results are shown in Table 2 with the measurement result of surface quality feature.
Embodiment 3
The present embodiment is used for illustrating cold-rolled steel sheet of the present invention and preparation method thereof and hot-dip galvanizing sheet steel and preparation method thereof.
Converter smelting, through LF stove Ca process, RH decarburization and continuous casting obtain slab of the present invention (thickness is 200mm), its moiety is in table 1.This heating of plate blank to 1182 DEG C is carried out to 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 carry out finish rolling, 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; Be cooled to (type of cooling is as laminar flow water cooling) after 715 DEG C to batch taking the cooling rate of 20 DEG C/s subsequently; Then be cooled to after room temperature (25 DEG C), on cold-rolling mill, with 73.3% draft, be cold-rolled to the thickness of 1.2mm.Then this cold-rolled steel sheet is carried out to alkali cleaning and electrolytic cleaning, alkali cleaning condition is: free alkalinity is controlled at 77Pt, and temperature is 79 DEG C, and the time is 52s; The condition of electrolytic cleaning is: free alkalinity is controlled at 72Pt, and temperature is 81 DEG C, and Faradaic current is controlled at 7400A, and the time is 70s.Then the 55s that anneals at 852 DEG C, obtains cold-rolled steel sheet after cooling.Then the cold-rolled steel sheet that, makes to obtain enters 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, is 23mm apart from the vertical range of steel plate.Carry out again straightening and chromium-free deactivation, wherein, straightening unit elongation 0.47%; The condition of passivation comprises: roller coating machine is delivered to application roll by dipping in liquid roller by environment-friendly chromium-free passivating solution, then is rotated and be evenly coated in surface of steel plate by application roll.Roller coat application roll and the roller speed ratio 130:60 that dips in liquid roller, top roll roll-in is 90daN, lower roll roll-in is 100daN.Obtain thus hot-dip galvanizing sheet steel, wherein, with respect to the cold-rolled steel sheet of 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
90in table 2, Fig. 3 is shown in by the photo of its microstructure, the results are shown in Table 2 with the measurement result of surface quality feature.
Comparative example 1
Carry out according to the method for embodiment 1, difference is that the moiety difference of slab, 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
90in table 2, Fig. 4 is shown in by the photo of its microstructure, the results are shown in Table 2 with the measurement result of surface quality feature.
Comparative example 2
Carry out according to the method for embodiment 1, difference is that 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
90in table 2, Fig. 5 is shown in by the photo of its microstructure, the results are shown in Table 2 with the measurement result of surface quality feature.
Comparative example 3
Carry out according to the method for embodiment 1, difference is, the 68s that anneals 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
90in table 2, Fig. 6 is shown in by the photo of its microstructure, the results are shown in Table 2 with the measurement result of surface quality feature.
Table 1
Note: surplus is iron and inevitable impurity
Table 2
Note :-
*1 represents that tension specimen testing process sample is disconnected in advance, cannot measure n value and r value;-
*2 represent to be organized as not perfect recrystallization tissue, cannot measure grain fineness number and grain-size.
Can find out by the data in table 1 and table 2, adopt preparation method of the present invention, can obtain one and there is finished product mechanical property and reach yield strength R
eLfor 130-160MPa, the good 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 characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out arbitrary combination between various 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 (12)
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, the intermediate slab obtaining is cooled to the temperature of batching with the speed of cooling of 15-25 DEG C/s after hot rolling;
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.
2. method according to claim 1, wherein, 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.
3. 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.
4. method according to claim 3, wherein, the thickness of the intermediate slab after described finish rolling is 2-5mm.
5. method according to claim 3, wherein, after described hot rolling and before batching, is cooled to the intermediate slab obtaining after hot rolling the temperature of batching with the speed of cooling of 17-23 DEG C/s.
6. method according to claim 1 or 5, wherein, described in the temperature of batching be 690-720 DEG C.
7. method according to claim 1, wherein, described cold rolling draft is 73-80%.
8. method according to claim 1, wherein, the condition of described annealing comprises: temperature is 850-880 DEG C, the time is 55-70s.
9. the cold-rolled steel sheet being made by the method described in any one in claim 1-8.
10. a preparation method for hot-dip galvanizing sheet steel, is characterized in that, the method comprises adheres to upper zinc coating by cold-rolled steel sheet claimed in claim 9 through galvanizing.
11. preparation methods according to claim 10, wherein, on every square metre of described hot-dip galvanizing sheet steel, the weight of described zinc coating is 80-120g.
12. the hot-dip galvanizing sheet steel being made by the preparation method described in claim 10 or 11.
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| CN105648330A (en) * | 2016-04-01 | 2016-06-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-dip galvanized steel plate and production method thereof |
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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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| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105648330A (en) * | 2016-04-01 | 2016-06-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-dip galvanized steel plate and production method thereof |
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| CN104131144B (en) | 2016-03-09 |
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