CN103993228A - Cold-rolled steel sheet and preparation method of cold-rolled steel sheet as well as hot-dipped galvanized steel sheet and preparation method of hot-dipped galvanized steel sheet - Google Patents
Cold-rolled steel sheet and preparation method of cold-rolled steel sheet as well as hot-dipped galvanized steel sheet and preparation method of hot-dipped galvanized steel sheet Download PDFInfo
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Abstract
The invention provides a cold-rolled steel sheet and a preparation method of the cold-rolled steel sheet as well as a hot-dipped galvanized steel sheet prepared from the cold-rolled steel sheet and a preparation method of the hot-dipped galvanized steel sheet. The preparation method of the cold-rolled steel sheet comprises the steps of sequentially carrying out hot rolling, coiling, cold rolling and annealing on a slab, wherein the coiling temperature is 590-630 DEG C, the reduction ratio of cold rolling is 60-75%, and the annealing is carried out under the annealing conditions that the annealing temperature is 740-790 DEG C and the annealing time is 40-70s; the slab comprises the following components in percentages by weight: 0.1-0.25wt% of C, less than or equal to 0.08wt% of Si, 0.10-0.60wt% of Mn, 0.01-0.06wt% of P, less than or equal to 0.020wt% of S, 0.03-0.07wt% of Ti, 0.01-0.08wt% of Al and the balance of Fe and unavoidable impurities. The hot-dipped galvanized steel sheet with the advantages of relatively low cost, high strength and good surface quality can be provided according to the invention.
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
In recent years, along with the continuous requirement of energy-saving and emission-reduction, reduction energy consumption, raising product stability and safety, building structure is used, also oriented high strength, the great surface quality development of household electrical appliances hot dip aluminum zinc plate.
CN102534365A discloses a kind of carbon aluminium-killed steel heat zinc coating plate and production method thereof, chemical composition C:0.02～0.04% of this invention; Si≤0.03%; Mn:0.2～0.35%; P≤0.020%; S≤0.015%; Alt:0.02～0.05%; N≤0.0040%, all the other are Fe and impurity.Yield strength 215MPa left and right, tensile strength 350MPa left and right, elongation 39.0% left and right.The intensity of the carbon aluminium-killed steel heat zinc coating plate obtaining by the method is lower.
Therefore, be badly in need of at present that a kind of cost is lower, intensity is high and the preparation method of the good hot-dip galvanizing sheet steel of surface quality.
Summary of the invention
The object of the invention is to overcome the lower defect of existing steel plate galvanized intensity, provide that a kind of cost is lower, intensity is high and the good hot-dip galvanizing sheet steel of surface quality 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, annealing, wherein,
Described coiling temperature is 590-630 DEG C;
Described cold rolling draft is 60-75%;
The condition of described annealing comprises: temperature is 740-790 DEG C, and the time is 40-70s;
Consisting of of described slab: C:0.1-0.25 % by weight, Si :≤0.08 % by weight, Mn:0.10-0.60 % by weight, P:0.01-0.06 % by weight, S :≤0.020 % by weight, Ti:0.03-0.07 % by weight, Al:0.01-0.08 % 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 present invention can be at low cost, and acquisition one has finished product mechanical property and reaches the strong R of surrender
eL>=420MPa, tensile strength R
m>=500MPa, elongation after fracture A
80>=28%, surface quality be characterized as that FC level is above, microstructure is ferrite+a small amount of pearlitic structure, ferrite grain size are that 10 grades of above and ferrite grain sizes are the hot-dip galvanizing sheet steel of 7-12 μ m, have 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, annealing, wherein, described coiling temperature is 590-630 DEG C; Described cold rolling draft is 60-75%; The condition of described annealing comprises: temperature is 740-790 DEG C, and the time is 40-70s; Consisting of of described slab: C:0.1-0.25 % by weight, Si :≤0.08 % by weight, Mn:0.10-0.60 % by weight, P:0.01-0.06 % by weight, S :≤0.020 % by weight, Ti:0.03-0.07 % by weight, Al:0.01-0.08 % by weight, surplus is iron and inevitable impurity.
In the present invention, although just can obtain the cold-rolled steel sheet of better intensity and better forming property and 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:0.12-0.23 % by weight, Si:0.01-0.06 % by weight, Mn:0.23-0.5 % by weight, P:0.025-0.050 % by weight, S:0.005-0.012 % by weight, Ti:0.035-0.065 % by weight, Al:0.035-0.06 % by weight, surplus is iron and inevitable impurity.
The present invention selects the reason of cold-rolled substrate chemical composition and scope thereof as follows:
Carbon (C) is the important element that affects plate property, and in the time that carbon content increases, armor plate strength improves, but forming property and welding property reduce.Operability and the economy of process for making mainly considered in the selection of described carbon content scope, and the over-all properties of product, if carbon content is lower than 0.1 % by weight, when steel-making, must carry out vacuum-treat, increase production cost, if carbon content exceedes 0.25%, not only increase because recarburization practice makes the production cost of steel-making, and the Plasticity Decreasing of steel plate, welding property worsens simultaneously.
Manganese (Mn) is solution strengthening element, increases manganese content and can improve intensity, is combined into MnS with sulphur simultaneously, prevents the thermal crack that causes because forming FeS, but Mn too high levels can affect the welding property of steel.Consider above-mentioned factor, the content of Mn element need to be controlled in above-mentioned scope.
Phosphorus (P) element is cost-effective solution strengthening element, increase phosphorus content and can improve intensity, but phosphoric is too much easily at grain boundary segregation, causes cold short.Consider above-mentioned factor, the content of phosphoric need to be controlled in above-mentioned scope.
Titanium (Ti) element of trace be mainly that effect is that nitrogen in fixing steel forms TiN, and in annealing process, separate out TiC, TiN has the effect of crystal grain thinning, TiC has precipitation strength effect, but titanium content is too much, its strengthening effect is tending towards saturated, taking cost into account, the content of titanium elements is controlled in above-mentioned scope.
Aluminium (Al) element Main Function is the oxygen removing in steel, avoids forming non-metallic inclusion in process of setting, and simultaneously with the nitrogen in the fixing steel of form of aluminium nitride, but too high aluminium will affect welding property and the coating adhesion of steel.Consider above-mentioned factor, the content of aluminium element need to be controlled in above-mentioned scope.
Silicon (Si) element and sulphur (S) element are as inevitable impurity and residual existence, because along with the increase of silicone content, after thermal treatment, the enrichment of surface of steel plate silicon is obvious, affect the platability of steel plate, cause surface of steel plate plating leakage point defect, affect solidity to corrosion and the surface quality of steel plate; Sulphur produces adverse influence to the plasticity of steel plate, easily causes hot-shortly, considers above-mentioned factor, the content of silicon (Si) element and sulphur (S) element need to be controlled in above-mentioned scope.
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.
According to the present invention, under preferable case, described hot rolling comprises roughing and finish rolling.
Preferably, described roughing open prick temperature be 1160-1250 DEG C, more preferably 1170-1220 DEG C, most preferably is 1178-1210 DEG C.Preferably, the finishing temperature of described roughing is 1030-1190 DEG C, more preferably 1053-1175 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 30-35mm, more preferably 30-32.5mm.
Preferably, the start rolling temperature 995-1150 DEG C of described finish rolling, more preferably 1000-1140 DEG C.Preferably, the finishing temperature of described finish rolling is 830-890 DEG C, more preferably 845-880 DEG C.
Preferably, the thickness of the intermediate slab after described finish rolling is 2-5mm, and more preferably 2-4mm, most preferably is 2.5-3.5mm.
According to the present invention, under preferable case, the method also comprises: after described finish rolling and before batching, the intermediate slab obtaining is cooled to the temperature of batching with the speed of cooling of 10-30 DEG C/s after finish rolling; More preferably, after described finish 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 finish rolling.
According to the present invention, described cooling can being undertaken by the whole bag of tricks well known in the art, for example, can be undertaken cooling by laminar flow water.
According to the present invention, under preferable case, described in the temperature of batching be 600-640 DEG C, more preferably 600-630 DEG C.
According to the present invention, under preferable case, described cold rolling draft is 60-70%, more preferably 65-70%.
According to the present invention, under preferable case, the condition of described annealing comprises: temperature is 750-790 DEG C, and the time is 40-70s; The condition of preferred described annealing comprises: temperature is 770-785 DEG C, and the time is 45-65s.
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 430-480 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 12-25KPa is highly 260-350mm, 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 120:(55-70 with the roller speed ratio that dips in liquid roller), be preferably 120:65; Top roll roll-in is 55-120daN; Lower roll roll-in is 65-130daN.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, can make at low cost described hot-dip galvanizing sheet steel, the strong R of surrender that hot-dip galvanizing sheet steel of the present invention has
eL>=420MPa, is preferably 420-450MPa; Tensile strength R
m>=500MPa, is preferably 500-540MPa; Elongation after fracture A
80>=28%, be preferably 28-32%.More than the surface quality that described hot-dip galvanizing sheet steel has is characterized as FC level, microstructure is ferrite+a small amount of pearlitic structure, it is (preferred more than ferrite grain size is 10 grades, 10-11 level), ferrite grain size is that 7-12 μ m (is preferably 8-11 μ m), has 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; 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 1193 DEG C is carried out to roughing, the finishing temperature of roughing is 1053 DEG C, the thickness of the intermediate slab after roughing is 30.8mm, intermediate slab after roughing is batched by Coil Box, then carry out finish rolling, the start rolling temperature of finish rolling is 1135 DEG C, and the finishing temperature of finish rolling is 877 DEG C, and the thickness of the intermediate slab after finish rolling is 3.5mm; Be cooled to 598 DEG C to batch with the cooling rate of 16 DEG C/s subsequently; Again on cold-rolling mill with 65.7% 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 75Pt, and temperature is 78 DEG C, and the time is 55s; The condition of electrolytic cleaning is: free alkalinity is controlled at 80Pt, and temperature is 75 DEG C, and Faradaic current is controlled at 7000A, and the time is 60s.Then the 57s that anneals at 775 DEG C, 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 20KPa is highly 290mm, is 28mm apart from the vertical range of steel plate.Carry out again straightening and chromium-free deactivation, wherein, straightening unit elongation 0.3%; The condition of passivation comprises: roller coating machine is delivered to application roll by dipping in liquid roller by environment-friendly chromium-free passivating solution, then is rotated and be evenly coated in surface of steel plate by application roll.Roller coat application roll and the roller speed ratio 120:65 that dips in liquid roller, top roll roll-in is 85daN, 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 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
80in table 2, Fig. 1 is shown in by the photo of its microstructure 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 1210 DEG C is carried out to roughing, the finishing temperature of roughing is 1082 DEG C, the thickness of the intermediate slab after roughing is 31.5mm, intermediate slab after roughing is batched by Coil Box, then carry out finish rolling, the start rolling temperature of finish rolling is 1021 DEG C, and the finishing temperature of finish rolling is 858 DEG C, and the thickness of the intermediate slab after finish rolling is 2.5mm; Be cooled to 623 DEG C to batch with the cooling rate of 18 DEG C/s subsequently; Again on cold-rolling mill with 70% draft, be cold-rolled to the thickness of 0.75mm.Then this cold-rolled steel sheet is carried out to alkali cleaning and electrolytic cleaning, alkali cleaning condition is: free alkalinity is controlled at 83Pt, and temperature is 78 DEG C, and the time is 45s; The condition of electrolytic cleaning is: free alkalinity is controlled at 80Pt, and temperature is 85 DEG C, and Faradaic current is controlled at 7300A, and the time is 70s.Then the 49s that anneals at 783 DEG C, 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 23KPa is highly 280mm, 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 120:65 that dips in liquid roller, top roll roll-in is 90daN, lower roll roll-in is 95daN.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 90g (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
80in table 2, Fig. 2 is shown in by the photo of its microstructure 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 1178 DEG C is carried out to roughing, the finishing temperature of roughing is 1175 DEG C, the thickness of the intermediate slab after roughing is 32.3mm, intermediate slab after roughing is batched by Coil Box, then carry out finish rolling, the start rolling temperature of finish rolling is 1000 DEG C, and the finishing temperature of finish rolling is 846 DEG C, and the thickness of the intermediate slab after finish rolling is 3.0mm; Be cooled to 608 DEG C to batch with the cooling rate of 22 DEG C/s subsequently; Again on cold-rolling mill with 70% draft, be cold-rolled to the thickness of 0.9mm.Then this cold-rolled steel sheet is carried out to alkali cleaning and electrolytic cleaning, alkali cleaning condition is: free alkalinity is controlled at 72Pt, and temperature is 73 DEG C, and the time is 60s; The condition of electrolytic cleaning is: free alkalinity is controlled at 83Pt, and temperature is 87 DEG C, and Faradaic current is controlled at 6900A, and the time is 50s.Then the 61s that anneals at 775 DEG C, 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 15KPa 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 0.40%; 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 120:65 that dips in liquid roller, top roll roll-in is 75daN, lower roll roll-in is 78daN.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 115g (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
80in table 2, Fig. 3 is shown in by the photo of its microstructure 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
80in table 2, Fig. 4 is shown in by the photo of its microstructure 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 580 DEG C, the strong R of surrender of gained hot-dip galvanizing sheet steel
eL, tensile strength R
m, elongation after fracture A
80in table 2, Fig. 5 is shown in by the photo of its microstructure with the measurement result of surface quality feature.
Comparative example 3
Carry out according to the method for embodiment 1, difference is, the 40s that anneals at 800 DEG C, the strong R of surrender of gained hot-dip galvanizing sheet steel
eL, tensile strength R
m, elongation after fracture A
80in table 2, Fig. 6 is shown in by the photo of its microstructure with the measurement result of surface quality feature.
Table 1
Note: surplus is iron and inevitable impurity
Table 2
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, annealing, it is characterized in that,
Described coiling temperature is 590-630 DEG C;
Described cold rolling draft is 60-75%;
The condition of described annealing comprises: temperature is 740-790 DEG C, and the time is 40-70s;
Consisting of of described slab: C:0.1-0.25 % by weight, Si :≤0.08 % by weight, Mn:0.10-0.60 % by weight, P:0.01-0.06 % by weight, S :≤0.020 % by weight, Ti:0.03-0.07 % by weight, Al:0.01-0.08 % by weight, surplus is iron and inevitable impurity.
2. method according to claim 1, wherein, consisting of of described slab: C:0.12-0.23 % by weight, Si:0.01-0.06 % by weight, Mn:0.23-0.5 % by weight, P:0.025-0.050 % by weight, S:0.005-0.012 % by weight, Ti:0.035-0.065 % by weight, Al:0.035-0.06 % 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 1160-1250 DEG C, and the finishing temperature of described roughing is 1030-1190 DEG C; The start rolling temperature 995-1150 DEG C of described finish rolling, the finishing temperature of described finish rolling is 830-890 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 1, wherein, the method also comprises: after described finish rolling and before batching, the intermediate slab obtaining is cooled to the temperature of batching with the speed of cooling of 10-30 DEG C/s after finish rolling; Preferably, after described finish 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 finish rolling.
6. method according to claim 1 or 5, wherein, described in the temperature of batching be 600-630 DEG C.
7. method according to claim 1, wherein, described cold rolling draft is 65-70%.
8. method according to claim 1, wherein, the condition of described annealing comprises: temperature is 750-790 DEG C, the time is 40-70s.
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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106917041A (en) * | 2015-12-28 | 2017-07-04 | 上海梅山钢铁股份有限公司 | A kind of cold rolling hot-dip aluminizing zincium steel plate of think gauge and its manufacture method |
| CN107034416A (en) * | 2017-04-10 | 2017-08-11 | 攀钢集团研究院有限公司 | Hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof |
| CN110607476A (en) * | 2019-09-30 | 2019-12-24 | 柳州钢铁股份有限公司 | Manufacturing method of cold-rolled hot-galvanized high-strength structural steel with yield strength of 350MPa |
| CN110699606A (en) * | 2019-09-30 | 2020-01-17 | 柳州钢铁股份有限公司 | Cold-rolled hot-galvanized high-strength structural steel with yield strength of 350MPa |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106917041A (en) * | 2015-12-28 | 2017-07-04 | 上海梅山钢铁股份有限公司 | A kind of cold rolling hot-dip aluminizing zincium steel plate of think gauge and its manufacture method |
| CN107034416A (en) * | 2017-04-10 | 2017-08-11 | 攀钢集团研究院有限公司 | Hot-dip coating aluminium-zinc alloy steel plate and preparation method thereof |
| CN110607476A (en) * | 2019-09-30 | 2019-12-24 | 柳州钢铁股份有限公司 | Manufacturing method of cold-rolled hot-galvanized high-strength structural steel with yield strength of 350MPa |
| CN110699606A (en) * | 2019-09-30 | 2020-01-17 | 柳州钢铁股份有限公司 | Cold-rolled hot-galvanized high-strength structural steel with yield strength of 350MPa |
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| CN103993228B (en) | 2016-05-18 |
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