CN104946968A - Cold-rolled tin plate for beverage can bottom cover and production method of cold-rolled tin plate - Google Patents
Cold-rolled tin plate for beverage can bottom cover and production method of cold-rolled tin plate Download PDFInfo
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Abstract
The invention relates to a cold-rolled tin plate for a beverage can bottom cover and a production method of the cold-rolled tin plate to mainly solve the technical problems that the existing cold-rolled tin plate for the beverage can bottom cover generates cracks and is poor in performance stability in the stamping forming process of manufacturing the beverage can bottom cover. The production method comprises the following steps: smelting according to components; preparing a hot-rolled steel coil by sequentially adopting molten iron desulfurization, converter top and bottom combined blowing, ladle bottom blowing of argon or LF furnace refining, whole process of Ar blowing for protecting casting, plate blank heating furnace heating, rough rolling, finish rolling and coiling; and then uncoiling newly, and performing acid cleaning, cold rolling, annealing by using a vertical continuous annealing furnace, electro-tinning and coiling to obtain a finished product with the thickness of 0.17-0.20mm, wherein the finish rolling temperature is 851-879 DEG C, the hot rolling coiling temperature is 640-660 DEG C, the cold rolling reduction ratio is 70-79%, the temperature range of the strip steel in a rolling hard state after cold rolling in a soaking zone of the vertical continuous annealing furnace is 560-580 DEG C, and the soaking time of the strip steel in the vertical continuous annealing furnace is 95-105s. The cold-rolled tin plate provided by the invention is mainly used for preparing the beverage can bottom cover.
Description
Technical field
The present invention relates to a kind of cold-rolled tin plate and production method thereof, particularly a kind of beverages can bottom cold-rolled tin plate and production method thereof.
Background technology
Beverages can bottom tin plate is in machine-shaping process, need to carry out Pressing Deformation, so to using the homogeneity of the intensity of material, hardness and performance to have higher requirement, in the production process of beverages can bottom, if intensity is below or above specified requirement, to directly affect working (machining) efficiency and the quality product of product, especially when the intensity of coil of strip by the gross can not keep uniform and stable, in the cold deformation processes such as follow-up punching press, the waste product defect such as also easily to crack, reduce lumber recovery, increase production cost.At present, most manufacturer is when selecting beverages can bottom steel, general use series of low-carbon steel grade, but carbon content a wider range of this steel series, carbon content fluctuation is larger, the carbon content control scope of materials supply producer is 0.01% ~ 0.15%, carbon content fluctuation in a big way causes the intensity of material and the less stable of plasticity and toughness, the intensity of material is fluctuated, add the control difficulty of producing drink tank bottom product facility, in production process, the distortion of beverages can bottom is uneven, larger to the quality influence of product, also directly affects the result of use of beverages can bottom product, so it is significant to produce the beverages can bottom steel with proper strength and the uniform and stable property of good performance.
Chinese Patent Application No. is application discloses " a kind of production method of anti-aging tinning black plate " of CN200910063723.5, and its production technique is: employing KR desulfurization → converter smelting → RH stove vacuum-treat → continuous casting → hot rolling → pickling → cold rolling → electrolytic degreasing → Full Hydrogen Bell Type Annealing Furnace annealing → smooth; Chemical composition (wt%) is C:0.02 ~ 0.06, Si :≤0.025, Mn :≤0.50, P :≤0.020, S :≤0.030, Als:0.005 ~ 0.040, Ti:0.005 ~ 0.020, N :≤0.005.Disclosed in this patent application, technical scheme has the following disadvantages: in (1) this patent application chemical composition, C content is lower, causes the low strength of its final finished, is not suitable for the production and application of beverages can bottom; In addition, containing a certain amount of micro alloying element Ti in this patent application chemical composition, and containing higher Mn element, in embodiment, Mn element is all greater than 0.29%, thus causes cost of alloy higher.(2) its annealing process adopts Full Hydrogen Bell Type Annealing Furnace annealing, and annealing time is very long, and this patent application specification regulation must be greater than 10 hours, and energy cost is higher, is unfavorable for saving energy and reduce the cost, and reduces production efficiency.(3) this patent adopts Full Hydrogen Bell Type Annealing Furnace annealing, and compared with continuous annealing, after annealing, the template of coil of strip is poor, is unfavorable for the production of subsequent handling; And after cover annealing, take the lead, with in, the intensity of magnetic tape trailer difference is comparatively large, the less stable of performance, is unfavorable for the production of beverages can bottom.
Chinese Patent Application No. is application discloses " a kind of production method of tin plate " of CN201310171001.8, C content in tin plate chemical composition disclosed in this patent application is lower, RH refining furnace carbonization treatment must be carried out in production process, and containing higher Mn element in this steel, also need in addition to add the alloying elements such as B, Ti in steel, production process is complicated, and production cost is higher.
Summary of the invention
The object of this invention is to provide a kind of beverages can bottom cold-rolled tin plate and production method thereof, mainly solve the technical problem that cracking, stability difference appear in existing beverages can bottom cold-rolled tin plate in the stamping process manufacturing beverages can bottom.
The technical solution used in the present invention is:
A kind of beverages can bottom cold-rolled tin plate, chemical component weight per-cent: C:0.065% ~ 0.085%, Si:0.005% ~ 0.034%, Mn:0.20% ~ 0.30%, P≤0.018%, S≤0.015%, Alt:0.065% ~ 0.085%, N≤0.004%, surplus is Fe and inevitable impurity element.
The reason that the chemical composition of beverages can bottom cold-rolled tin plate of the present invention is limited in above-mentioned scope is as follows:
Carbon: suitably increase the C content in steel, Mn content can be reduced, reduce Ar3 transformation temperature, prevent finish rolling in two-phase region rolling, contribute to improving plate shape, be conducive to low cost and obtain suitable yield strength, ensure the economy of the forming property of material, intensity, rigidity and material.C, Mn content can not be too high, otherwise, easily cause material punching performance to decline, and easy stamping cracking.Therefore, C content range set of the present invention is 0.065% ~ 0.085%;
Silicon: lower silicone content, be conducive to the follow-up coating performance of product on the one hand, on the other hand, product has required higher Al content, does not rely on the deoxidation of Si element.Therefore element silicon design is 0.005% ~ 0.034%;
Manganese: Mn act as solution strengthening, improves intensity in steel, and as punching press material, if Mn too high levels, then forming property declines, and cost increases, economy declines.Technical solution of the present invention setting Mn content range is 0.20% ~ 0.30%;
Phosphorus: P is generally solid-solubilized in ferrite, there is very strong solution strengthening effect, phosphorus also has serious segregation tendency, and spreads very slow in perlite and ferrite, is not easy homogenizing and produces high phosphorus band and low-phosphorous band, along with phosphorus content in steel increases, phosphorus strengthens the solution strengthening effect of steel, and banded structure increases the weight of, and the intensity of steel plate and hardness raise, and plasticity and toughness sharply decline, forming property degenerates.Technical solution of the present invention setting P≤0.018%;
Sulphur: in Pressing Deformation process, first there is cracking as stress raiser in sulfide inclusion, or makes to be mingled with to be separated with metallic matrix and produce trickle hole, and these holes are constantly grown up with deformation process, further expand and cause steel plate to ftracture.For ensureing certain forming property, require to reduce the sulphur content in steel.Technical solution of the present invention setting S≤0.015%;
Aluminium: the effect of aluminium in steel is extremely important, Al and N combines and generates AlN, AlN obtains in annealing process to cold-drawn performance that favourable { key factor of 111} texture and cheese crystal grain, simultaneously because AlN is to the fixed action of atom N, makes cold-reduced sheet have good ageing resistance performance.Al content range of the present invention is set as 0.065% ~ 0.085%.
Nitrogen: not only can form nitride but also can dissolve in residual gap after solidification at nitrogen in steel.Remarkable to the performance impact of steel, intensity, hardness are improved, and plasticity declines.For beverages can bottom steel, nitrogen should be as far as possible low.N content of the present invention is set as N≤0.004%.
A kind of production method of beverages can bottom cold-rolled tin plate, smelt by following Ingredient percent: C:0.065% ~ 0.085%, Si:0.005% ~ 0.034%, Mn:0.20% ~ 0.30%, P≤0.018%, S≤0.015%, Alt:0.065% ~ 0.085%, N≤0.004%, surplus is Fe and inevitable impurity element; Desulfurizing iron, converter top bottom blowing, steel ladle bottom argon blowing or the refining of LF stove, whole process is adopted to blow Ar protective casting, bar plate heating stove heating, roughing, finish rolling, batch acquisition coils of hot-rolled steel successively; then uncoiling again, through pickling, cold rolling, vertical continuous annealing furnace annealing, eleetrotinplate, batch that to obtain thickness be 0.17mm ~ 0.20mm finished product, it is characterized in that:
1, the carbon content setting in steel
Increase the C content in steel, Mn content can be reduced, reduce Ar3 transformation temperature, prevent finish rolling in two-phase region rolling, contribute to improving plate shape.C, Mn content can not be too high, otherwise, easily cause material punching performance to decline, and easy stamping cracking, torsional deformation.Therefore, C content range set of the present invention is 0.065% ~ 0.085%.
2, continuous casting steel billet Heating temperature setting
If Heating temperature is too high, AlN and Ti(C in steel, N) etc. second phase particles dissolve after again separate out precipitate that is more tiny, disperse in hot rolling reeling process, then inhibit and grow up at recrystallize that is cold rolling, the rear crystal grain of annealing subsequently, the recrystallization temperature of steel plate is raised, low annealing temperature can not be adapted to.If Heating temperature is too low, due to the natural temperature drop in course of hot rolling, the finishing temperature of application claims cannot be ensured.Continuous casting steel billet Heating temperature is set as 1030 DEG C ~ 1060 DEG C.
3, finish rolling end temp setting
For preventing finish rolling in two-phase region rolling, finishing temperature need higher than Ar3 transformation temperature, but finishing temperature can not be too high, otherwise must improve the Heating temperature of continuous casting steel billet, increases energy consumption.Therefore, consider, finish rolling end temp of the present invention is set as 851 DEG C ~ 879 DEG C.
4, hot-rolling coiling temperature setting
Hot-rolling coiling temperature major effect materials microstructure, performance and cold rolling after company move back recrystallization temperature and stamping formabilily.According to lower coiling temperature, material re-crystallizes temperature improves, and is unfavorable for the carrying out of subsequent anneal, and end of reel temperature fluctuation is comparatively large, the more difficult control of temperature homogeneity, is unfavorable for the homogeneity improving material property; If coiling temperature is higher, be then unfavorable for follow-up pickling, grain growth, precipitate alligatoring, although material yield strength is lower, but still easily cause stamping cracking.Consider, it is 640 DEG C ~ 660 DEG C that the present invention sets coiling temperature.
5, cold rolling draft setting
The present invention adopts once cold rolling to produce, and has the advantages such as organization of production is convenient, cost is low, output is high, Surface Defects in Steel Plate incidence is little compared with secondary cold-rolling.In cold rolling process, determine that the main technologic parameters of steel plate material is cold rolling reduction, general purpose cold-rolling of steel plate deflection is the bigger the better, because large pressure can produce more removable dislocation, removable dislocation is higher, resistance to deformation is less, stress is not concentrated to crystal boundary, and to adjacent crystal grain transfer distortion, is thus not easy to produce slip line.In addition, the deformation energy of the larger generation of deflection unstable that is larger, tissue is also higher, so recrystallization temperature is lower, the crystal grain after recrystallize is fine uniform more, and the intensity of steel plate and plasticity all can improve.But when cold rolling draft is more than 80%, the grain fineness number of finished product remains unchanged substantially; In addition, when draft is more than 80%, mill load increases obviously, and cold-rolled process less stable, easily cause industrial accident.The present invention carries out cold rolling on 5 Stands Cold Tandem Mills, effectively can control, by suitable cold rolling deformation, can obtain that plate shape is better, the satisfactory coiled sheet of yield strength to the tension force of band steel.Consider, the preferably cold rolling draft of the present invention is 70% ~ 79%.
6, annealing temperature setting
Metal is in cold-rolled process, and crystal grain is elongated, and grain orientation changes, and form the texture of certain type, intracrystalline defect also can increase, and is reflected to the change in mechanical property, as: the anisotropy etc. occurring work hardening, mechanics and physicals.These defects and change all need to be eliminated by the recrystallization annealing process after rolling.Therefore, recrystallization annealing is cold rolling rear control and the necessary means changing metal material tissue, texture and performance.After cold rolling roll recovery and recrystallization that hard steel experiences in annealing process and grain growth three processes all have influence on end properties.In order to make the coil of strip after annealing, there is suitable yield strength, the present invention passes through test of many times, obtain rational annealing temperature, it is 560 DEG C ~ 580 DEG C that the present invention sets steel band in the annealing temperature of vertical continuous annealing furnace soaking zone, is set as 95s ~ 105s in the time of soaking zone.
The microstructure of the beverages can bottom cold-rolled tin plate that the present invention obtains is ferrite+free cementite, grain size number is 9 ~ 10 grades, lower yield strength Rel is 365MPa ~ 395MPa, tensile strength Rm is 430MPa ~ 450MPa, lower yield strength is less than 25MPa in the distribution fluctuates of plate width direction, the lower yield strength entirety fluctuation of different steel plate different sites is also less than 30MPa, and tensile strength is all less than 20MPa in the distribution fluctuates of plate width direction.
The present invention has following positively effect compared to existing technology:
1, the present invention controlled by carbon content design, hot rolling continuous casting steel billet heating and temperature control, finishing temperature and oiler temperature control, cold rolling draft, the optimum combination of continuous annealing furnace annealing temperature and annealing time, ensure that the yield strength of beverages can bottom cold-rolled tin plate meets the demands, lower yield strength Rel is 365MPa ~ 395MPa, tensile strength Rm is 430MPa ~ 450MPa, microstructure is ferrite+free cementite, plate shape is good, there is excellent stamping formabilily, meet the stamping manufacture demand of beverages can bottom.
2, do not contain expensive alloying elements in material component, by adopting cooling controlling and rolling controlling process and reasonable annealing temperature control techniques to produce, technique is simple, and manufacturing cost is lower.
Accompanying drawing explanation
Accompanying drawing is the metallographic structure photo of beverages can bottom cold-rolled tin plate embodiment 1 of the present invention.
Embodiment
This enforcement selects product specification to be 0.18mm*836mm, below in conjunction with embodiment 1 ~ 4 and comparative example---and disclosed in the patent application that Chinese Patent Application No. is CN200510027291.4, the invention will be further described, as shown in table 1 ~ table 4.
Table 1 chemical composition of the present invention (weight percent %), surplus is Fe and inevitable impurity.
| Element | C | Si | Mn | P | S | Alt | N | Ti | O |
| The present invention | 0.065~0.085 | 0.005~0.034 | 0.20~0.30 | ≤0.018 | ≤0.015 | 0.065~0.085 | ≤0.004 | ||
| Embodiment 1 | 0.080 | 0.034 | 0.20 | 0.010 | 0.006 | 0.077 | 0.0040 | ||
| Embodiment 2 | 0.066 | 0.020 | 0.23 | 0.016 | 0.015 | 0.085 | 0.0029 | ||
| Embodiment 3 | 0.073 | 0.006 | 0.30 | 0.018 | 0.013 | 0.065 | 0.0023 | ||
| Embodiment 4 | 0.085 | 0.018 | 0.26 | 0.015 | 0.009 | 0.069 | 0.0032 | ||
| Comparative example | ≤0.006 | ≤0.03 | 0.1 ~0.2 | ≤0.015 | ≤0.015 | 0.025~0.075 | ≤0.0030 | 0.03~0.08 | ≤0.0040 |
The continuously cast bloom of the chemical composition that obtains meeting the requirements by converter melting, thickness is 210 ~ 230mm, and width is 800 ~ 1300mm, and length is 5000 ~ 10000mm.Compared with the present invention, the C content of comparative example is lower, 1 order of magnitude lower than C content of the present invention, RH refining furnace carbonization treatment must be carried out in production process, also need to control oxygen level, production process is complicated, in addition in order to obtain enough intensity, comparative example need add the expensive alloying elements such as Ti in steel, and production cost is higher.
The scale slab of STEELMAKING PRODUCTION is delivered to process furnace and is reheated, and delivers to rolling on Continuous Heat tandem rolling mill after dephosphorization of coming out of the stove.After roughing milling train and the controlled rolling of finish rolling Continuous mill train, then batch, qualified coils of hot-rolled steel output.Hot rolling technology controls in table 2.
Table 2 hot rolling technology controling parameters of the present invention
| Hot Rolling Parameters | Slab heating temperature (DEG C) | Finish rolling end temp (DEG C) | Finish rolling compression ratio (%) | Coiling temperature (DEG C) |
| The present invention | 1030～1060 | 851～879 | 75～80 | 640～660 |
| Embodiment 1 | 1030 | 853 | 76 | 646 |
| Embodiment 2 | 1060 | 860 | 80 | 659 |
| Embodiment 3 | 1055 | 879 | 79 | 641 |
| Embodiment 4 | 1040 | 870 | 77 | 650 |
| Comparative example | 1190～1250 | 880～920 | Nothing | 550～630 |
As can be seen from Table 2: compared with the present invention, slab heating temperature and the finish rolling end temp of comparative example are all higher, and energy cost is higher, is unfavorable for saving energy and reduce the cost, and temperature height surface easily produces iron scale, affects the surface quality of the finished product; In order to obtain enough intensity, the coiling temperature of comparative example is lower; Comparative example does not limit finish rolling compression ratio, is not easy to produce the controlled and product of stable performance of performance.
By above-mentioned coils of hot-rolled steel again uncoiling after overpickling, reversable mill or 5 Stands Cold Tandem Mills carry out cold rolling, cold rolling draft is 70% ~ 79%, the steel band rolling hard state after cold rolling through vertical continuous annealing furnace annealing, eleetrotinplate, batch the finished product cold-rolled steel strip obtaining thickness 0.18mm.Annealing process is: steel band is 560 DEG C ~ 580 DEG C in the annealing region of the soaking zone of vertical continuous annealing furnace, is 95s ~ 105s in the time of soaking zone.Process control parameter is in table 3.
Table 3 the present invention is cold rolling, annealing process controling parameters
| Cold rolling, annealing parameter | Cold rolling draft (%) | Annealing temperature (DEG C) | Soaking zone time (s) |
| The present invention | 70～79 | 560～580 | 95～105 |
| Embodiment 1 | 70 | 560 | 105 |
| Embodiment 2 | 79 | 580 | 95 |
| Embodiment 3 | 76 | 575 | 96 |
| Embodiment 4 | 73 | 568 | 101 |
| Comparative example | 82～92 | 720～770 | 25～50 |
As can be seen from Table 3: compared with the present invention, the annealing temperature of comparative example, far above the present invention, is unfavorable for plate form control, and the product strength produced is lower, is not suitable for the production of beverages can bottom.
The beverages can bottom cold-rolled tin plate utilizing aforesaid method to obtain.With reference to accompanying drawing 1, the microstructure of beverages can bottom cold-rolled tin plate is ferrite+free cementite, and grain size number is 9 ~ 10 grades, and lower yield strength Rel is 365MPa ~ 395MPa, tensile strength Rm is 430MPa ~ 450MPa.
Aforesaid method is utilized to obtain the strength property of beverages can bottom cold-rolled tin plate in table 4 ~ table 5.
The lower yield strength ReL (MPa) of table 4 steel plate of the present invention is in the distribution of plate width direction
The tensile strength Rm (MPa) of table 5 steel plate of the present invention is in the distribution of plate width direction
As can be seen from above-described embodiment, the single embodiment of mechanical property important indicator lower yield strength of embodiment 1 ~ 4 is less than 25MPa in the distribution fluctuates of plate width direction, from the whole steel plate of this material on the whole, the lower yield strength entirety fluctuation of different steel plate different sites is also less than 30MPa, tensile strength is all less than 20MPa in the distribution fluctuates of plate width direction, ensure that belt steel product performance is even, plate shape is good, there is excellent stamping formabilily, meet the stamping manufacture demand of beverages can bottom.Although add a certain amount of V-N steel element ti in comparative example, but because its C content is very low, and its annealing temperature is higher, cause that the yield strength of its finished product tin plate is less than 280MPa, tensile strength is less than 370MPa, low strength, is not suitable for for manufacturing beverages can bottom.
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 (4)
1. a beverages can bottom cold-rolled tin plate, it is characterized in that chemical composition mass percent is: C:0.065% ~ 0.085%, Si:0.005% ~ 0.034%, Mn:0.20% ~ 0.30%, P≤0.018%, S≤0.015%, Alt:0.065% ~ 0.085%, N≤0.004%, surplus is Fe and inevitable impurity element.
2. beverages can bottom cold-rolled tin plate as claimed in claim 1, it is organized as ferrite+free cementite, and described grain fineness number of organizing is 9 ~ 10 grades.
3. beverages can bottom cold-rolled tin plate as claimed in claim 1 or 2, its 0.17mm ~ 0.20mm thick beverages can bottom cold-rolled tin plate lower yield strength Rel is 365MPa ~ 395MPa, and tensile strength Rm is 430MPa ~ 450MPa.
4. the production method of a beverages can bottom cold-rolled tin plate, smelt by following Ingredient percent: C:0.065% ~ 0.085%, Si:0.005% ~ 0.034%, Mn:0.20% ~ 0.30%, P≤0.018%, S≤0.015%, Alt:0.065% ~ 0.085%, N≤0.004%, surplus is Fe and inevitable impurity element, adopt desulfurizing iron successively, converter top bottom blowing, steel ladle bottom argon blowing or the refining of LF stove, whole process blows Ar protective casting, bar plate heating stove heats, roughing, finish rolling, batch acquisition coils of hot-rolled steel, then uncoiling again, through pickling, cold rolling, vertical continuous annealing furnace is annealed, eleetrotinplate, batch and obtain finished product, it is characterized in that: continuous casting steel billet Heating temperature is 1030 DEG C ~ 1060 DEG C, hot continuous mill is rolled, finish rolling end temp is 851 DEG C ~ 879 DEG C, finish rolling compression ratio is 75% ~ 80%, after finish rolling, coiling temperature is 640 DEG C ~ 660 DEG C, cold rolling draft is 70% ~ 79%, the hard state band steel that rolls after cold rolling is 560 DEG C ~ 580 DEG C in the annealing temperature of the soaking zone of vertical continuous annealing furnace, be 95s ~ 105s with steel in the time of soaking zone.
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| CN106917039A (en) * | 2015-12-28 | 2017-07-04 | 上海梅山钢铁股份有限公司 | A kind of cold rolling tin plate of flash plating and its manufacture method |
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| CN109136780A (en) * | 2018-09-26 | 2019-01-04 | 首钢集团有限公司 | A kind of aerosol top ends of cans tin plate and its production method |
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| CN108796381A (en) * | 2017-04-26 | 2018-11-13 | 宝山钢铁股份有限公司 | The steel plate and its manufacturing method of a kind of high axial bearing capacity of tank and excellent formability |
| CN108796381B (en) * | 2017-04-26 | 2020-08-25 | 宝山钢铁股份有限公司 | Steel plate with high axial bearing capacity and excellent formability for tank and manufacturing method thereof |
| CN109385569A (en) * | 2017-08-10 | 2019-02-26 | 上海梅山钢铁股份有限公司 | A kind of high rigidity cold rolling electroplating tin steel plate and its production method |
| CN109136780A (en) * | 2018-09-26 | 2019-01-04 | 首钢集团有限公司 | A kind of aerosol top ends of cans tin plate and its production method |
| CN110699608A (en) * | 2019-10-10 | 2020-01-17 | 柳州钢铁股份有限公司 | Low-cost cold-rolled high-strength steel for goods shelves |
| CN110724884A (en) * | 2019-10-10 | 2020-01-24 | 柳州钢铁股份有限公司 | Manufacturing method of low-cost cold-rolled high-strength steel for goods shelves |
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| CN111534757A (en) * | 2020-05-11 | 2020-08-14 | 首钢集团有限公司 | Steel for packaging, production method thereof and packaging product |
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| CN114058946A (en) * | 2021-10-14 | 2022-02-18 | 首钢集团有限公司 | Low-anisotropy high-strength high-elongation steel substrate, tin-plated plate and preparation method of tin-plated plate |
| CN114875319A (en) * | 2022-05-01 | 2022-08-09 | 江苏沙钢集团有限公司 | Tin plate for easy-open lid and production method thereof |
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