CN103993228B - 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 being made 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, annealing, wherein, described coiling temperature is 590-630 DEG C; Described cold rolling reduction ratio 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. Can provide by the present invention that a kind of cost is lower, intensity is high and the good hot-dip galvanizing sheet steel of 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 being made by this cold-rolled steel sheetZinc steel plate 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, thisBright chemical composition C:0.02～0.04%; 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 strength215MPa left and right, tensile strength 350MPa left and right, percentage elongation 39.0% left and right. Obtain by the methodThe intensity of the carbon aluminium-killed steel heat zinc coating plate arriving is lower.
Therefore, be badly in need of at present that a kind of cost is lower, intensity is high and the good hot-dip galvanizing sheet steel of surface qualityPreparation method.
Summary of the invention
The object of the invention is to overcome the lower defect of existing galvanized steel plain sheet intensity, a kind of cost is providedLower, intensity is high and the good hot-dip galvanizing sheet steel of surface quality and preparation method thereof, and for the preparation of thisCold-rolled steel sheet of the galvanized steel plain sheet of 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 reduction ratio 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 said method.
The present invention also provides a kind of preparation method of hot-dip galvanizing sheet steel, and wherein, the method comprises above-mentionedCold-rolled steel sheet adheres to zinc coat through galvanizing by dipping.
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, obtains one and have finished product mechanical propertyReach the strong R of surrendereL>=420MPa, tensile strength Rm>=500MPa, elongation after fracture A80>=28%, tableFace qualitative character is that FC level is above, microscopic structure is ferrite+a small amount of pearlitic structrure, ferrite crystal grainDegree is that 10 grades of above and ferrite grain sizes are the hot-dip galvanizing sheet steel of 7-12 μ m, has good marketProspect.
Other features and advantages of the present invention are described in detail the detailed description of the invention 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 description, withDetailed description of the invention one is below used from explanation the present invention, but is not construed as limiting the invention. ?In accompanying drawing:
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.
Detailed description of the invention
Below the specific embodiment of the present invention is elaborated. Should be understood that, retouch in this placeThe detailed description of the invention of stating 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 reduction ratio is 60-75%;The condition of described annealing comprises: temperature is 740-790 DEG C, and the time is 40-70s; The composition of described slabFor: 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, more thanAmount is iron and inevitable impurity.
In the present invention, although in the time that the composition of slab is in above-mentioned scope, just can obtain better intensity andThe cold-rolled steel sheet of better forming property and made the heat of good surface quality by this cold-rolled steel sheetGalvanized steel plain sheet, but in order to strengthen the performance of obtained cold-rolled steel sheet and hot-dip galvanizing sheet steel, preferable caseUnder, the 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 performance reduce. Process for making is mainly considered in the selection of described carbon content scopeOperability and economy, and the combination property of product, if carbon content, lower than 0.1 % by weight, is refinedWhen steel, must carry out application of vacuum, increase production cost, if carbon content exceedes 0.25%, not only because of carburettingOperate and the production cost of steel-making is increased, and the Plasticity Decreasing of steel plate, welding performance worsens simultaneously.
Manganese (Mn) is solution strengthening element, increases manganese content and can improve intensity, is combined with sulphur simultaneouslyBecome MnS, prevent because forming the fire check that causes of FeS, but Mn too high levels can affect steelWelding performance. 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, increases phosphorus content and can improve intensity,But P elements, too much easily at cyrystal boundary segregation, causes cold short. Consider above-mentioned factor, need to be by P elementsContent is controlled in above-mentioned scope.
Titanium (Ti) element of trace be mainly that effect is that nitrogen in fixing steel forms TiN, and in annealingIn process, separate out TiC, TiN has the effect of crystal grain thinning, and TiC has precipitation strength effect, but titaniumContent is too much, and its invigoration effect is tending towards saturated, taking cost into account, the content of titanium elements is controlled atState in scope.
Aluminium (Al) element Main Function is the oxygen removing in steel, avoids forming in process of setting nonmetalField trash, simultaneously with the nitrogen in the fixing steel of form of aluminium nitride, but too high aluminium will affect the weldability of steelEnergy and coating adhesion. Consider above-mentioned factor, the content of aluminium element need to be controlled to above-mentioned scopeIn.
Silicon (Si) element and sulphur (S) element be as inevitable impurity and residual existence, because withThe increase of silicone content, after heat treatment the enrichment of surface of steel plate silicon obvious, affect the platability of steel plate, causeSurface of steel plate plating leakage point defect, affects corrosion resistance and the surface quality of steel plate; Sulphur produces the plasticity of steel plateAdverse influence, easily causes hot-shortly, considers above-mentioned factor, need to be by silicon (Si) element and sulphur (S)The content of element is controlled in above-mentioned scope.
According to the present invention, described slab can adopt the known method of preparing continuous casting billet of this area to carry outPreparation, for example, can pass through blast furnace ironmaking, molten iron pretreatment, converter smelting, steel ladle deoxidation, alloyAfter changing furnace rear refining, LF electrical heating, RH application of vacuum and sheet billet continuous casting, obtain described continuous casting billet. ItsThe condition of 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 be 1178-1210 DEG C. Preferably, the finishing temperature of described roughing is 1030-1190 DEG C, more excellentElect 1053-1175 DEG C as. In addition, in order to reach the needed initial temperature of roughing of hot rolling, Ke YiBefore roughing, first continuous casting billet is heated in heater to required temperature when being heated to continuous casting billet and carrying out roughingDegree.
Preferably, the thickness of the intermediate slab after described roughing is 30-35mm, more preferably30-32.5mm。
Preferably, the start rolling temperature 995-1150 DEG C of described finish rolling, more preferably 1000-1140 DEG C. ExcellentSelection of land, 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, more preferably 2-4mm,Most preferably be 2.5-3.5mm.
According to the present invention, under preferable case, the method also comprises: after described finish rolling and batching itBefore, the intermediate slab obtaining after finish rolling is cooled to the temperature of batching with the cooling velocity of 10-30 DEG C/s;More preferably, after described finish rolling and before batching, with the cooling velocity of 15-25 DEG C/s by finish rollingAfter the intermediate slab that obtains be cooled to the temperature of batching.
According to the present invention, described cooling can being undertaken by the whole bag of tricks well known in the art, for example canUndertaken 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 preferably600-630℃。
According to the present invention, under preferable case, described cold rolling reduction ratio is 60-70%, more preferably65-70％。
According to the present invention, under preferable case, the condition of described annealing comprises: temperature is 750-790 DEG C,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 to instituteThe cold-rolled steel sheet obtaining cleans. Described cleaning can adopt the cleaning method of the steel plate of this area routine,For example alkali cleaning and electrolytic cleaned, its objective is greasy dirt in order to remove surface of cold-rolled steel plate, iron scale,Iron powders etc. affect the impurity of plate surface quality. Preferably, the condition of described alkali cleaning preferably includes: cleanThe free alkalinity of liquid is 60-90Pt, and temperature is 65-80 DEG C, and the time is 40-70s. More preferably, described inThe condition of alkali cleaning preferably includes: the free alkalinity of cleaning fluid is 72-83Pt, and temperature is 73-78 DEG C, the timeFor 45-65s. Preferably, the condition of described electrolytic cleaned preferably includes: the free alkalinity of cleaning fluid is65-85Pt, temperature is 70-90 DEG C, and electric current is 6500-7500A, and the time is 45-75s. More preferably,The condition of described electrolytic cleaned preferably includes: the free alkalinity of cleaning fluid is 80-83Pt, and temperature is 75-87DEG C, electric current is 6900-7300A, 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 above-mentioned coldRolled steel plate adheres to zinc coat through galvanizing by dipping.
According to the present invention, described galvanizing by dipping can adopt continous way hot dipping method, also can adopt intermittentlyFormula 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 by dipping of the present invention comprises: the temperature of zinc pot is 430-480 DEG C, more preferably455-465℃。
The amount of the zinc coating of the present invention to hot-dip galvanizing sheet steel there is no special restriction, can be according to concrete rightThe requirement of galvanized steel plain sheet is adjusted, preferably, on every square metre of described hot-dip galvanizing sheet steel, described zinc-platedThe weight of layer is 80-120g, and the zinc coat on the described hot-dip galvanizing sheet steel of here every square metre refers to zinc-platedThe double-edged zinc coat of steel plate.
According to the present invention, described preparation method also comprises the zinc melt on the steel plate to taking out from zinc potPurge, make the zinc coating on steel plate distribute more evenly, preferably adopt air knife to purge.The condition that described air knife purges preferably includes: pressure 12-25KPa is highly 260-350mm, apart from steelThe vertical range of plate is 22-30mm.
According to the present invention, described preparation method also comprise to purge after hot-dip galvanizing sheet steel carry out straightening, instituteState the method that straightening can adopt this area routine, preferably, described straightening percentage 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 is carried outPassivation, the present invention preferably adopts chromium-free deactivation. Method to described passivation is not particularly limited, canFor the passivating method of this area routine. Preferably, described passivation, for adopting environmental protection chromium-free passivation liquid, is passed throughRoll coating model carries out surface treatment to band steel, and the condition of described passivation comprises: roller coat application roll with dip in liquid rollerRoller speed ratio be 120:(55-70), be preferably 120:65; Top roll roll-in is 55-120daN; Lower rollRoll-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 said method.
By method of the present invention, can make at low cost described hot-dip galvanizing sheet steel, hot dip of the present inventionThe strong R of surrender that zinc steel plate haseL>=420MPa, is preferably 420-450MPa; Tensile strengthRm>=500MPa, is preferably 500-540MPa; Elongation after fracture A80>=28%, be preferably 28-32%.More than the surface quality that described hot-dip galvanizing sheet steel has is characterized as FC level, microscopic structure is ferrite+a small amount ofPearlitic structrure, ferrite grain size is 10 grades above (preferably, 10-11 level), ferrite grain sizeFor 7-12 μ m (is preferably 8-11 μ m), has good market prospects.
Below will describe the present invention by embodiment.
In following examples and comparative example, yield strength ReL, tensile strength Rm, elongation after fracture A80Method of testing carry out according to GBT228-2002 metal material tensile testing at ambient temperature; AdoptThe method specifying in GB/T2518-2008 is judged the surface quality feature of hot-dip galvanizing sheet steel.
Embodiment 1
The present embodiment be used for illustrating cold-rolled steel sheet of the present invention and preparation method thereof and hot-dip galvanizing sheet steel andPreparation method.
Converter smelting, through LF stove Ca process, that RH decarburization and continuous casting obtain slab of the present invention is (thickDegree is 200mm), its constituent is in table 1. This heating of plate blank to 1193 DEG C is carried out to roughing, roughingFinishing temperature be 1053 DEG C, the thickness of the intermediate slab after roughing is 30.8mm, in after roughingBetween slab batch by Coil Box, then carry out finish rolling, the start rolling temperature of finish rolling is 1135 DEG C, finish rollingFinishing temperature is 877 DEG C, and the thickness of the intermediate slab after finish rolling is 3.5mm; Cold with 16 DEG C/s subsequentlySpeed is cooled to 598 DEG C to batch; Again on cold-rolling mill with 65.7% reduction ratio, be cold-rolled toThe thickness of 1.2mm. Then this cold-rolled steel sheet is carried out to alkali cleaning and electrolytic cleaned, alkali cleaning condition is: freeBasicity is controlled at 75Pt, and temperature is 78 DEG C, and the time is 55s; The condition of electrolytic cleaned is: free alkalinityBe controlled at 80Pt, temperature is 75 DEG C, and Faradaic current is controlled at 7000A, and the time is 60s. Then 775The 57s that anneals at 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 air knife blowsThe condition of sweeping is: pressure 20KPa is highly 290mm, is 28mm apart from the vertical range of steel plate. AgainCarry out straightening and chromium-free deactivation, wherein, straightening percentage elongation 0.3%; The condition of passivation comprises: roll coaterBy dipping in liquid roller, environment-friendly chromium-free passivating solution is delivered to application roll, then rotates and be evenly coated in by application rollSurface of steel plate. Roller coat application roll and the roller speed ratio 120:65 that dips in liquid roller, top roll roll-in is 85daN, underRoller roll-in is 100daN. Obtain thus hot-dip galvanizing sheet steel, wherein, with respect to the cold-rolled steel of every square metrePlate, the weight of described zinc coating is 100g (zinc coating on two sides). The surrender of gained hot-dip galvanizing sheet steel is strongReL, tensile strength Rm, elongation after fracture A80In table 2, it is aobvious with the measurement result of surface quality featureFig. 1 is shown in by the photo of micro-tissue.
Embodiment 2
The present embodiment be used for illustrating cold-rolled steel sheet of the present invention and preparation method thereof and hot-dip galvanizing sheet steel andPreparation method.
Converter smelting, through LF stove Ca process, that RH decarburization and continuous casting obtain slab of the present invention is (thickDegree is 200mm), its constituent is in table 1. This heating of plate blank to 1210 DEG C is carried out to roughing, roughingFinishing temperature be 1082 DEG C, the thickness of the intermediate slab after roughing is 31.5mm, in after roughingBetween slab batch by Coil Box, then carry out finish rolling, the start rolling temperature of finish rolling is 1021 DEG C, finish rollingFinishing temperature is 858 DEG C, and the thickness of the intermediate slab after finish rolling is 2.5mm; Cold with 18 DEG C/s subsequentlySpeed is cooled to 623 DEG C to batch; Again on cold-rolling mill with 70% reduction ratio, be cold-rolled toThe thickness of 0.75mm. Then this cold-rolled steel sheet is carried out to alkali cleaning and electrolytic cleaned, alkali cleaning condition is: tripBe controlled at 83Pt from basicity, temperature is 78 DEG C, and the time is 45s; The condition of electrolytic cleaned is: free alkaliDegree is controlled at 80Pt, and temperature is 85 DEG C, and Faradaic current is controlled at 7300A, and the time is 70s. Then existThe 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, air knifeThe condition purging 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 percentage elongation 0.35%; The condition of passivation comprises: roller coatMachine is delivered to application roll by dipping in liquid roller by environment-friendly chromium-free passivating solution, then is rotated evenly and be coated with by application rollAt surface of steel plate. 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 of every square metrePlate, the weight of described zinc coating is 90g (zinc coating on two sides). The surrender of gained hot-dip galvanizing sheet steel is strongReL, tensile strength Rm, elongation after fracture A80In table 2, it is aobvious with the measurement result of surface quality featureFig. 2 is shown in by the photo of micro-tissue.
Embodiment 3
The present embodiment be used for illustrating cold-rolled steel sheet of the present invention and preparation method thereof and hot-dip galvanizing sheet steel andPreparation method.
Converter smelting, through LF stove Ca process, that RH decarburization and continuous casting obtain slab of the present invention is (thickDegree is 200mm), its constituent is in table 1. This heating of plate blank to 1178 DEG C is carried out to roughing, roughingFinishing temperature be 1175 DEG C, the thickness of the intermediate slab after roughing is 32.3mm, in after roughingBetween slab batch by Coil Box, then carry out finish rolling, the start rolling temperature of finish rolling is 1000 DEG C, finish rollingFinishing temperature is 846 DEG C, and the thickness of the intermediate slab after finish rolling is 3.0mm; Cold with 22 DEG C/s subsequentlySpeed is cooled to 608 DEG C to batch; Again on cold-rolling mill with 70% reduction ratio, be cold-rolled to 0.9mmThickness. Then this cold-rolled steel sheet is carried out to alkali cleaning and electrolytic cleaned, alkali cleaning condition is: free alkalinity controlBuilt in 72Pt, temperature is 73 DEG C, and the time is 60s; The condition of electrolytic cleaned is: free alkalinity is controlled at83Pt, temperature is 87 DEG C, and Faradaic current is controlled at 6900A, and the time is 50s. Then at 775 DEG CAnnealing 61s, 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 air knife purgesCondition is: pressure 15KPa is highly 320mm, is 28mm apart from the vertical range of steel plate. Carry out againStraightening and chromium-free deactivation, wherein, straightening percentage elongation 0.40%; The condition of passivation comprises: roll coater passes throughDip in liquid roller environment-friendly chromium-free passivating solution is delivered to application roll, then rotate and be evenly coated in steel plate by application rollSurface. Roller coat application roll and the roller speed ratio 120:65 that dips in liquid roller, top roll roll-in is 75daN, lower roll rollerPress as 78daN. Obtain thus hot-dip galvanizing sheet steel, wherein, with respect to the cold-rolled steel sheet of every square metre, instituteThe weight of stating zinc coating is 115g (zinc coating on two sides). The strong R of surrender of gained hot-dip galvanizing sheet steeleL、Tensile strength Rm, elongation after fracture A80With the measurement result of surface quality feature in table 2, its micro-groupFig. 3 is shown in by the photo of knitting.
Comparative example 1
Carry out according to the method for embodiment 1, difference is that the constituent difference of slab, is specifically shown inShown in table 1, the strong R of the surrender of gained hot-dip galvanizing sheet steeleL, tensile strength Rm, elongation after fracture A80WithThe measurement result of surface quality feature is in table 2, and Fig. 4 is shown in by the photo of its microscopic structure.
Comparative example 2
Carry out according to the method for embodiment 1, difference is that coiling temperature is 580 DEG C, gained hot dipThe strong R of surrender of zinc steel plateeL, tensile strength Rm, elongation after fracture A80Mensuration with surface quality featureThe results are shown in Table 2, Fig. 5 is shown in by the photo of its microscopic structure.
Comparative example 3
Carry out according to the method for embodiment 1, difference is, the 40s that anneals at 800 DEG C, gained heatThe strong R of surrender of galvanized steel plain sheeteL, tensile strength Rm, elongation after fracture A80Survey with surface quality featureSurely the results are shown in Table 2, Fig. 6 is shown in by the photo of its microscopic structure.
Table 1
Note: surplus is iron and inevitable impurity
Table 2
More than describe the preferred embodiment of the present invention in detail, still, the present invention is not limited to above-mentioned realityExecute the detail in mode, within the scope of technical conceive of the present invention, can be to technical side of the present inventionCase is carried out multiple simple variant, and these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technology spy described in above-mentioned detailed description of the inventionLevy, in reconcilable situation, can combine by any suitable mode, for fear of needn'tThe repetition of wanting, the present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as itsWithout 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: slab is passed through to hot rolling, volume successivelyGet, cold rolling, annealing, it is characterized in that,
Described coiling temperature is 590-630 DEG C;
Described cold rolling reduction ratio is 60-75%;
The condition of described annealing comprises: temperature is 770-785 DEG C, and the time is 45-65s;
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;
Described hot rolling comprises roughing and finish rolling, after described finish rolling and before batching, with 10-30 DEG CThe cooling velocity of/s is cooled to the intermediate slab obtaining after finish rolling the temperature of batching.
2. method according to claim 1, wherein, the 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, more thanAmount is iron and inevitable impurity.
3. method according to claim 1, wherein, described hot rolling comprises roughing and finish rolling, instituteThe start rolling temperature of stating roughing is 1160-1250 DEG C, and the finishing temperature of described roughing is 1030-1190 DEG C; InstituteState the start rolling temperature 995-1150 DEG C of 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 rollingFor 2-5mm.
5. method according to claim 1, wherein, the method also comprises: described finish rolling itRear and before batching, with the cooling velocity of 15-25 DEG C/s, the intermediate slab obtaining after finish rolling is cooled toThe temperature of batching.
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 reduction ratio is 65-70%.
8. a preparation method for hot-dip galvanizing sheet steel, is characterized in that, the method comprises: wanted by rightAsk the method described in any one in 1-7 to prepare the step of cold-rolled steel sheet, and cold rolling by what obtainThe step that steel plate adheres to zinc coat through galvanizing by dipping.
9. preparation method according to claim 8, wherein, every square metre of described hot-dip galvanizing sheet steelUpper, the weight of described zinc coat is 80-120g.
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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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| JP3596316B2 (en) * | 1997-12-17 | 2004-12-02 | 住友金属工業株式会社 | Manufacturing method of high tensile high ductility galvanized steel sheet |
| JP4322610B2 (en) * | 2003-09-19 | 2009-09-02 | 日新製鋼株式会社 | Cold-rolled steel sheet with excellent impact characteristics and method for producing the same |
| JP5018935B2 (en) * | 2010-06-29 | 2012-09-05 | Ｊｆｅスチール株式会社 | High-strength hot-dip galvanized steel sheet excellent in workability and manufacturing method thereof |
| CN103045833B (en) * | 2011-10-11 | 2015-05-06 | 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 |
| CN102787271A (en) * | 2012-07-17 | 2012-11-21 | 马钢(集团)控股有限公司 | Production method of 460MPa grade high-surface quality structural hot dipped galvanized steel plate and its product |
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