CN104711474A - Cold rolled tin-plated steel plate for multiple printing and painting and manufacturing method thereof - Google Patents
Cold rolled tin-plated steel plate for multiple printing and painting and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 238000007639 printing Methods 0.000 title claims abstract description 26
- 238000010422 painting Methods 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000005097 cold rolling Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 40
- 238000000137 annealing Methods 0.000 claims abstract description 28
- 238000005096 rolling process Methods 0.000 claims abstract description 28
- 238000002161 passivation Methods 0.000 claims abstract description 23
- 239000000126 substance Substances 0.000 claims abstract description 17
- 239000005028 tinplate Substances 0.000 claims description 49
- 238000001978 electrochemical passivation Methods 0.000 claims description 13
- 238000006388 chemical passivation reaction Methods 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 10
- 238000005098 hot rolling Methods 0.000 claims description 8
- 238000007654 immersion Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- JHWIEAWILPSRMU-UHFFFAOYSA-N 2-methyl-3-pyrimidin-4-ylpropanoic acid Chemical compound OC(=O)C(C)CC1=CC=NC=N1 JHWIEAWILPSRMU-UHFFFAOYSA-N 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000010960 cold rolled steel Substances 0.000 claims description 4
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- 239000000758 substrate Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000000576 coating method Methods 0.000 abstract description 9
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 8
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 12
- 230000008569 process Effects 0.000 description 12
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 239000003973 paint Substances 0.000 description 9
- 239000002585 base Substances 0.000 description 7
- 239000011651 chromium Substances 0.000 description 7
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 6
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Abstract
The invention relates to a cold rolled tin-plated steel plate for multiple printing and painting and a manufacturing method thereof, and aims to solve the technical problems that in the prior art, the coating on the conventional cold rolled tin-plated steel plates for multiple printing and painting can be easily peeled off, the adhesive force between the coating and the steel plate is weak, and the color developing effect is bad after printing. The manufacturing method comprises the following steps: washing a hot-rolled hard tin-plated steel plate with a thickness of 1.8 to 2.3 mm by acid, performing continuous cold rolling, carrying out continuous annealing, flattening, electroplating tin on the steel plate, passivating the steel plate, and finally rolling the steel plate to obtain a finished product; wherein the cold rolling reduction ratio is 85 to 90%, the annealing temperature is 550 to 620 DEG C, the temperature is maintained for 60 to 120 seconds, the steel plate is flattened by two machines, the work roller of the first machine is an electro-discharge texturing roller with a Ra of 1.2 to 1.6 um, the rolling force is 500 to 700 t; the work roller of the second machine is a grinding roller with a Ra of 0.3 to 0.5 um, the rolling force is 250 to 350 t; the flattening elongation rate is 1 to 2%, and the passivation is carried out through an electrochemical method and a chemical method. The provided steel plate is mainly used to produce food/beverage cans, which have requirements on multi-color printing.
Description
Technical field
The present invention relates to a kind of cold rolling tin plate and manufacture method thereof, particularly a kind of cold rolling tin plate for repeatedly printing painting and manufacture method thereof, belong to technical field of iron-base alloy.
Background technology
The tin layers of cold rolling tin plate can provide the surface propertys such as beautiful metalluster and good corrosion resisting property; iron-based body can be protected not corroded in acid condition; the compound of tin is nontoxic simultaneously; the color and luster of food, flavour, nutritive value and the health to people are all had no adverse effects; therefore cold rolling tin plate is widely used in the container such as food cans, beverages can, and cold rolling tin plate needs through repeatedly printing and toasting before manufacturing food cans, beverages can.
The manufacturing processed of cold rolling tin plate Three piece Can first opens greatly sheet material to tin plate to carry out the printing process such as interior painting Huang, outer japanning, baking; Especially, due to the difference of content, some beverages can will carry out being coated with in 2 times, prime outward for 1 time, 1 ~ 3 color printing and 1 oil polish, and each print all will be toasted after being coated with.Then printed cold rolling tin plate is processed into cylinder by cut-parts, makes can body, and subsequent is the welding side seam of can body, finally carries out the capping of cover crimping, has part pot aesthetically also to need to carry out the distortion such as localized necking or reinforcement.This just requires that cold rolling tin plate has excellent paint film tack, after repeatedly printing and being coated with baking and distortion, still there will not be pull-away phenomenon, in order to avoid affect the use of beverage or the outward appearance of jar.Usually, it is the steel plate simulation tin graphed sheet technique of a certain amount of coating of coating is carried out 3 ~ 4 times at about 180 ~ 200 DEG C toast that paint film tack detects, each baking 10 ~ 12min, but go out to be cooled to room temperature after last baking, depict the thread of certain length again with scratching instrument, the area that after then gluing note with special adhesive tape, tearing observation paint film is torn also is graded.According to current food safety and canner thereof to the aesthetic of product, to this pot general requirement sticking power≤2 grade repeatedly printing painting.
In prior art, in Tinplate Production process, usually adopt that 5 frame continuous cold rollings, continuous annealing are smooth, eleetrotinplate and passivation process.Mainly passivation procedure is concentrated on to the control of tin plate sticking power, usually adopts the mode of Conventional electrochemical passivation, chemical passivation or first chromium plating electrochemical passivation again.Under current multicolor overprint technique, the tin plate that first two mode obtains covering with paint property all can not meet the demands, and the third mode can meet the demands, but conventional zinc-plated product line does not all possess ability.This is because first two passivation mode only needs less electricity consumption supply, the current density of process steel plate is maximum to be no more than at 5A/dm2, and can meet the demands with a kind of passivating solution; And the third mode not only needs to use two kinds of different passivating solutions simultaneously, and passivation initially needs larger electricity consumption supply, and these all need to produce in line in routine to carry out equipment and change and could realize.
Chinese Patent Application No. be CN 200480036333.4 patent discloses a kind of steel plate for container and manufacture method thereof, its chemical composition is C:0.0800% or less, N:0.600% or less, Si:2.0% or less, Mn:2.0% or less, P:0.10% or less, S:0.05% or less, Al:2.0% or Fe that is less and surplus; When its method is the thermal treatment after cold rolling, nitrogenize is carried out to steel plate, the N content of control table surface layer and intermediate thickness layers and hardness, the steel surface roughness Ra obtained can control at 0.9um or less, and PPI value can be the concavo-convex peak number of every 2.54 cm lengths of 250() or more.The Key of Implementation of this patent is that accurate control cincture is to the N content of steel plate 1/8 thickness table surface layer and 1/4 thickness table surface layer, and the composition precision controlling of layering is difficult to realize in reality is produced greatly; And this patent provide only steel plate and the N content control overflow of above composition, and it is open to realize final roughness Ra and PPI by which kind of technique or mode.
Chinese Patent Application No. is the chemical treatment method that patent discloses the low chromium surface film of a kind of electrolytic tinplate of CN 95109018.6, it is characterized in that passivating solution is the Na2Cr2O72H2O aqueous solution of content 18 ~ 30g/l, the pH of passivating solution is 3.5 ~ 5.5, passivation temperature is 49 ~ 60 DEG C, passivation time 0.6 ~ 3 second, passive film chrome content < 1.5mg/m2, the packaging being suitable for canned mushroom uses, be characterized in that passive film chromium content is low, can avoid occurring in tank to concentrate corrosion; But too low chromium content can make tin plate sheet surface oxide film increase, so cause tin plate variable color jaundice and solidity to corrosion, covering with paint declines.
Summary of the invention
The object of this invention is to provide a kind of cold rolling tin plate for repeatedly printing painting and manufacture method thereof, solving in prior art for repeatedly printing the cold rolling tin plate poor adhesive force of painting, film easily peels off, the technical problem of the color developing effect difference after printing.
The technical solution used in the present invention is:
A kind of cold rolling tin plate for repeatedly printing painting, the chemical component weight per-cent of its substrate is: C:0.05% ~ 0.09%, Si≤0.04%, Mn:0.2% ~ 0.4%, P≤0.02%, S≤0.02%, Alt0.02% ~ 0.05%, O≤0.004%%, N≤0.0035%, surplus is Fe and inevitable impurity element.
For repeatedly printing a manufacture method for the cold rolling tin plate of painting, the method comprises:
Be that 1.8 ~ 2.3mm hot rolling hard uncoated tinplate base carries out pickling, cold continuous rolling, continuous annealing, smooth, eleetrotinplate, passivation, batches the step obtaining finished product to thickness, wherein,
The chemical component weight per-cent of described hot rolling hard uncoated tinplate base is: C:0.05% ~ 0.09%, Si≤0.04%, Mn:0.2% ~ 0.4%, P≤0.02%, S≤0.02%, Alt0.02% ~ 0.05%, O≤0.004%%, N≤0.0035%, surplus is Fe and inevitable impurity element, yield strength is 250 ~ 350MPa, and tension is degree of being 350 ~ 450MPa by force;
Described cold continuous rolling step is five frame tandem rollings, and cold rolling total reduction is 85% ~ 90%;
The annealing temperature of described continuous annealing step controls to be 550 DEG C ~ 620 DEG C, and soaking time is 60s ~ 120s;
Described planarization step is that Stand Mill is smooth, and working roll adopts chrome-plated roller, and 1 frame working roll employing roughness is the electrical spark texturing roller of Ra1.2 ~ 1.6um, and rolling load controls between 500 ~ 700t; 2 frame working rolls adopt roughness to be Ra0.3 ~ 0.5um grinding-roller, and rolling load controls at 250 ~ 350t; Smooth elongation control is between 1% ~ 2%;
Described passivation step is electrochemical passivation+chemical passivation, by being with, steel immersion concentration is 20 ~ 28g/L, pH value is in the sodium dichromate solution of 4.0 ~ 4.6, first carry out electrochemical passivation 1 ~ 2s, current density 1.5 ~ 2.0A/dm2, after carry out chemical passivation, rinse with pure water after chemical immersion 1 ~ 2s.
The reason that the inventive method key process parameter is selected is as follows:
1, cold rolling draft
Cold rolling draft improves, and can store more deformation energy in steel plate, increases recrystallize motivating force, reduces recrystallization temperature, but mill load increases obviously when draft is more than 90%, and process stability is poor.Consider the actual capacity of five stand mill, it is 85% ~ 90% that the present invention sets cold rolling draft.
2, annealing temperature setting
Recrystallization annealing mainly in order to eliminate produce in cold-rolled process work hardening, anisotropy etc. in all kinds of defect of crystals and mechanical property, and recrystallization temperature and the product performance demands of being with steel are mainly considered in the setting of annealing temperature, it is 550 DEG C ~ 620 DEG C that the present invention sets steel plate in the annealing region that vertical continuous annealing furnace soaking zone exports, and soaking time is 60s ~ 120s.
3, smooth control
Cold rolling levelling technique processes under carrying out minute-pressure to the steel band through recrystallization annealing, and object has be the yield point elongation being eliminated carbon aluminium-killed steel by the setting of smooth rate at three: one, ensures the formability of material; Two is the templates improving the rear steel plate of annealing; Three are through the roughness that leveling roll gives required by surface of steel plate.
The present invention adopts Stand Mill smooth, can the roughness Ra of control cincture steel and RPc value neatly.Found by up to a hundred experimental and theoretical analysis, the roughness of belt steel surface depends on the acting in conjunction of levelling machine 1,2 frame, and band steel will obtain the moderate and surface that RPc value is higher of Ra value, must adopt the mode that texturing roller combines with grinding-roller; If though only using texturing roll strip surface can obtain high its negative impact of RPc value is then that Ra value is higher, can reach more than 1.0um, this can cause follow-up zinc-plated rear finished surface obfuscation, and then affects color printing color developing effect; Again, if though only use grinding-roller can obtain the Ra value designed, RPC value is lower, only can reach about 40/cm, and zinc-plated rear finished product brightness is fine, but the paint film adhesion of zinc-plated finished product is poor, can not meet tank requirement processed.
The preferred value that applicant determines gloss level of roll through test of many times is, 1 frame working roll employing roughness is the electrical spark texturing roller of Ra1.2 ~ 1.6um, and 2 frame working rolls adopt roughness to be Ra0.3 ~ 0.5um grinding-roller.For 1 frame, if working roll roughness is higher than the upper limit, the pit pattern of roller texturing is excessively dark, and when producing low tin volume production product, tin layers is difficult to cover pit and cause dew iron, affects tin-plated board corrosion-resistance and brightness uniformity; Working roll roughness then can make the RPC value of steel plate decline lower than lower limit, finally affect the tack of tin plate and paint film, and due to the complete processing of texturing roller, is difficult to the homogeneity of guarantee roughness during below Ra1.2.For 2 frames, the too high meeting of working roll roughness causes the roughness of the finished product high, cause the finished product partially dark, and rolling defect is difficult to avoid; Too low, metal wire-drawing sense can be made not obvious, impact print be coated with after attractive in appearance.
The roller matching method of Cold-Rolled Strip Temper Mill of the present invention must distribute with Cold-Rolled Strip Temper Mill rolling load and is combined, otherwise can not reach effect of the present invention.This is because gloss level of roll needs just can work under certain rolling load effect, but rolling load crosses conference makes roll increase to the replication rate of band steel, cause product roughness Ra too high and have the risk that band steel ruptures, rolling load is too small, makes roll not enough to the replication rate of band steel, then can cause product roughness Ra and RPC value on the low side.The present invention is through a large amount of tests, determine 1 frame working roll roughness Ra 1.2 ~ 1.6um, rolling load is 500 ~ 700t, 2 frame working roll roughness Ra 0.3 ~ 0.5um, rolling load are 250 ~ 350t, smooth elongation control both can realize performance requriements in the scope of 1% ~ 2%, can ensure again good plate shape.
4, the control of passivation procedure parameter
The technique of passivation procedure electrochemistry+chemical passivation of the present invention, obtains the passivation film structure that chromium metal combines with surperficial alkali formula chromic oxide on cold-rolled steel sheet tin coating surface.This is because chromium metal only just can obtain when electrochemical passivation, and want cathodic polarization potential for just obtaining time higher, chromium metal is conducive to the spreadability of passive film at surface of steel plate, but too high, sticking power can be caused to be deteriorated and to affect other performance, so will be controlled conduction time; And alkali formula chromic oxide all can be obtained when electrochemical passivation and chemical passivation, the basic structure of alkali formula chromic oxide is Cr(OH) 3, and containing the polymer be connected with chemical combination key (Cr-OH) and oxidation key (Cr-O), this molecule is not easily oxidized, and hydroxyl also easily combines with some functional group in paint film in alkali formula chromic oxide, thus improve the chemical adhesion of tin plate and paint film.
It is 20 ~ 28g/L that the present invention selects passivating solution to be concentration, pH value is the sodium dichromate solution of 4.0 ~ 4.6, steel will be with to immerse in passivating solution, electrochemical passivation is carried out in first energising, current density 1.5 ~ 2.0A/dm2, treatment time 1 ~ 2s, then chemical immersion is carried out in power-off, and treatment time 1 ~ 2s finally rinses with pure water again.The selection of passivation time, passivating solution concentration, passivation temperature is produced as main principle, without the need to increasing extra control device or equipment to adapt to producing line.Key is the mode adopting the chemical passivation again of first electrochemical passivation, and the too small meeting of current density makes total chrome reduce, useful to tack, but can affect solidity to corrosion; Current density is too high, and total chrome can be made to increase, useful to solidity to corrosion, is harmful to tack.
Eleetrotinplate operation, the cold rolling tin plate for repeatedly printing painting that the present invention adopts continuous annealing to produce, adopts the eleetrotinplate technique identical with common cold rolling tin plate to produce.
What the present invention obtained is 75 ~ 95/cm for repeatedly to print the cold rolling tin plate finished surface roughness of painting be Ra0.35 ~ 0.45um, RPC, and total surface Cr amount is 3.0 ~ 5.0mg/m
2, when film thickness is at 5 ~ 15g/m2, still 1 grade can be reached through repeatedly coat bake postadhesion power.
The present invention has following positively effect compared to existing technology:
1, the present invention can make full use of the smooth advantage of Stand Mill, obtain there is certain roughness Ra value and the thinner condition of surface of profile, for follow-up tin coating provides the matrix of state excellence, increase the specific surface area of surface of steel plate and coating contacts simultaneously, improve the physical adhesion of steel plate and coating.
2, the cold rolling tin plate surface passivated membrane that the present invention obtains has chromium metal and alkali formula chromic oxide concurrently, and alkali formula chromic oxide ensure that the chemical adhesion of tin plate and coating, and chromium metal can improve the antiacid of tin plate and solidity to corrosion again.
3, implementation method of the present invention is easy, and production technique is simple, and conventional Tin-Plating Production Line is improved the technique that can realize electrochemistry+chemical passivation a little.
Accompanying drawing explanation
Accompanying drawing 1 is the stereoscan photograph of the cold rolling tin plate surface topography of the embodiment of the present invention 1.
Embodiment
Below in conjunction with embodiment, illustrate the present invention further, following embodiment should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
The manufacture method of a kind of cold rolling tin plate for repeatedly printing painting disclosed by the invention, the method comprises:
Be that 1.8 ~ 2.3mm hot rolling hard uncoated tinplate base carries out pickling, cold continuous rolling, continuous annealing, smooth, eleetrotinplate, passivation, batches the step obtaining finished product to thickness, wherein,
The chemical component weight per-cent of described hot rolling hard uncoated tinplate base is: C:0.05% ~ 0.09%, Si≤0.04%, Mn:0.2% ~ 0.4%, P≤0.02%, S≤0.02%, Alt0.02% ~ 0.05%, O≤0.004%%, N≤0.0035%, surplus is Fe and inevitable impurity element, yield strength is 250 ~ 350MPa, and tension is degree of being 350 ~ 450MPa by force;
Described cold continuous rolling step is five frame tandem rollings, and cold rolling total reduction is 85% ~ 90%;
The annealing temperature of described continuous annealing step controls to be 550 DEG C ~ 620 DEG C, and soaking time is 60s ~ 120s;
Described planarization step is that Stand Mill is smooth, and working roll adopts chrome-plated roller, and 1 frame working roll employing roughness is the electrical spark texturing roller of Ra1.2 ~ 1.6um, and rolling load controls between 500 ~ 700t; 2 frame working rolls adopt roughness to be Ra0.3 ~ 0.5um grinding-roller, and rolling load controls at 250 ~ 350t; Smooth elongation control is between 1% ~ 2%;
Described passivation step is electrochemical passivation+chemical passivation, by being with, steel immersion concentration is 20 ~ 28g/L, pH value is in the sodium dichromate solution of 4.0 ~ 4.6, first carry out electrochemical passivation 1 ~ 2s, current density 1.5 ~ 2.0A/dm2, after carry out chemical passivation, rinse with pure water after chemical immersion 1 ~ 2s.
Table 1 hot rolling hard of the present invention uncoated tinplate base chemical composition (weight percent %).
Surplus is Fe and inevitable impurity.
To above-mentioned thickness be 1.8 ~ 2.3mm, yield strength is that 250 ~ 350MPa, tension are by force for the hot rolling hard uncoated tinplate base of degree 350 ~ 450MPa carries out pickling, 5 Stands Cold Tandem Mills carry out cold rolling, cold rolling draft is 85% ~ 90%, the steel band rolling hard state after cold rolling obtains the cold-rolled steel sheet of product thickness 0.18mm ~ 0.30mm through vertical continuous annealing furnace annealing, annealing process is: steel plate is respectively 550 DEG C ~ 620 DEG C in the temperature range that the soaking zone of vertical continuous annealing furnace exports, and steel plate in the soaking time of soaking zone is: 60s ~ 120s.Cold rolling, annealing process controling parameters is in table 2.
Table 2 the present invention is cold rolling, annealing process controling parameters
By cold-rolled steel sheet after annealing through Two-stand Temper Mill carry out smooth, then carry out conventional eleetrotinplate and produce tin plate.Levelling machine working roll adopts chrome-plated roller, and 1 frame working roll employing roughness is the electrical spark texturing roller of Ra1.2 ~ 1.6um, and rolling load controls between 500 ~ 700t; 2 frame working rolls adopt roughness to be Ra0.3 ~ 0.5um grinding-roller, and rolling load controls at 250 ~ 350t; Smooth elongation control is between 1% ~ 2%, and flattening process controling parameters is in table 3.
Table 3 flattening process controling parameters of the present invention
Steel plate after eleetrotinplate is immersed concentration is 20 ~ 28g/L, pH value is in the sodium dichromate solution of 4.0 ~ 4.6, electrochemical passivation is carried out in first energising, current density 1.5 ~ 2.0A/dm2, treatment time is 1 ~ 2s, then turn off power supply and carry out chemical passivation, carry out rinsing with pure water, batch and obtain finished product after chemical immersion 1 ~ 2s, passivation technology parameter is in table 4.
Table 4 passivation technology controling parameters of the present invention
The present invention joins roller and rolling load distribution, passivation mode, passivation electricity and time by controlling smooth operation, producing film adhesion excellence, being applicable to repeatedly print the cold rolling tin plate finished surface roughness of painting is Ra0.35 ~ 0.45um, RPC is 75 ~ 95/cm, total surface Cr amount is 3.0 ~ 5.0mg/m2, when film thickness is at 5 ~ 15g/m2, still can reach 1 grade through repeatedly coat bake postadhesion power, the surface topography of the cold rolling tin plate finished product of the present invention as shown in Figure 1.
Getting tin plate of the present invention is that plain plate tests sample as sticking power, be coated with technique according to the print of food and beverage and carry out film, sticking power is tested and is evaluated and performs with reference to QBT 2763-2006, is coated with the sticking power test data after toasting through repeatedly printing and detects surface property in table 5 to final finished sampling.
The surface characteristics of table 5 finished product of the present invention
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (5)
1. one kind for repeatedly printing the cold rolling tin plate of painting, it is characterized in that, the chemical composition mass percent of described cold rolling tin plate substrate is: C:0.05% ~ 0.09%, Si≤0.04%, Mn:0.2% ~ 0.4%, P≤0.02%, S≤0.02%, Alt0.02% ~ 0.05%, O≤0.004%%, N≤0.0035%, surplus is Fe and inevitable impurity element.
2. a kind of cold rolling tin plate for repeatedly printing painting as claimed in claim 1, it is characterized in that, the surfaceness of described cold rolling tin plate is Ra0.35 ~ 0.45um, RPC is 75 ~ 95/cm, and total surface Cr amount is 3.0 ~ 5.0mg/m
2.
3. one kind for repeatedly printing the manufacture method of the cold rolling tin plate of painting, it is that 1.8 ~ 2.3mm hot rolling hard uncoated tinplate base carries out pickling that the method comprises thickness, cold continuous rolling, continuous annealing, smooth, eleetrotinplate, passivation, batch the step obtaining finished product, it is characterized in that, the chemical component weight per-cent of described hot rolling hard uncoated tinplate base is: C:0.05% ~ 0.09%, Si≤0.04%, Mn:0.2% ~ 0.4%, P≤0.02%, S≤0.02%, Alt0.02% ~ 0.05%, O≤0.004%%, N≤0.0035%, surplus is Fe and inevitable impurity element, yield strength is 250 ~ 350MPa, tension is degree of being 350 ~ 450MPa by force, the cold rolling draft of described cold continuous rolling step controls to be 85% ~ 90%, the roll hard state band steel of described continuous annealing step after cold rolling controls to be 550 DEG C ~ 620 DEG C in the annealing temperature of vertical continuous annealing furnace soaking zone, be 60s ~ 120s in soaking zone soaking time, the smooth elongation control of described planarization step cold-rolled steel sheet is 1% ~ 2%, described passivation step is electrochemical passivation+chemical passivation.
4. the manufacture method of a kind of cold rolling tin plate for repeatedly printing painting as claimed in claim 3, it is characterized in that, described planarization step is that Stand Mill is smooth, and working roll adopts chrome-plated roller, 1 frame working roll is the electrical spark texturing roller of Ra1.2 ~ 1.6um, and rolling load is 500 ~ 700t; 2 frame working rolls are Ra0.3 ~ 0.5um grinding-roller, and rolling load is 250 ~ 350t.
5. the manufacture method of a kind of cold rolling tin plate for repeatedly printing painting as claimed in claim 3, it is characterized in that, described passivation step is that concentration is 20 ~ 28g/L, pH value is in the sodium dichromate solution of 4.0 ~ 4.6 by being with steel to immerse, first carry out electrochemical passivation 1 ~ 2s, current density 1.5 ~ 2.0A/dm2, after carry out chemical passivation, rinse with pure water after chemical immersion 1 ~ 2s.
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