CN104946968B - A kind of beverage can bottom cold-rolled tin plate and its production method - Google Patents

A kind of beverage can bottom cold-rolled tin plate and its production method Download PDF

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CN104946968B
CN104946968B CN201410125206.7A CN201410125206A CN104946968B CN 104946968 B CN104946968 B CN 104946968B CN 201410125206 A CN201410125206 A CN 201410125206A CN 104946968 B CN104946968 B CN 104946968B
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CN104946968A (en
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韩孝永
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Shanghai Meishan Iron and Steel Co Ltd
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Abstract

The present invention relates to a kind of beverage can bottom cold-rolled tin plate and its production method, mainly solve existing beverage can bottom cold-rolled tin plate poor technical problem of cracking, stability in the stamping process of manufacture beverage can bottom.Production method presses composition smelting, desulfurizing iron is adopted successively, converter top bottom blowing, steel ladle bottom argon blowing or LF stove refines, whole process blows Ar protective castings, heating of plate blank stove heat, roughing, finish rolling, batch acquisition coils of hot-rolled steel, then uncoiling again, Jing pickling, it is cold rolling, vertical continuous annealing furnace is annealed, electrotinning, batch thickness is obtained for 0.17mm~0.20mm finished products, finish rolling finishing temperature is 851 DEG C~879 DEG C, hot-rolling coiling temperature is 640 DEG C~660 DEG C, cold rolling reduction ratio is 70%~79%, the hard state strip steel that rolls after cold rolling is 560 DEG C ~ 580 DEG C in the temperature range of the soaking zone of vertical continuous annealing furnace, soaking time of the strip steel in vertical continuous annealing furnace is 95s ~ 105s.Present invention is mainly used for making beverage can bottom.

Description

A kind of beverage can bottom cold-rolled tin plate and its production method
Technical field
The present invention relates to a kind of cold-rolled tin plate and its production method, more particularly to a kind of beverage can bottom is with cold rolling tin plating Plate and its production method.
Background technology
Beverage can bottom tin plate during machine-shaping needs to carry out Pressing Deformation, so to using material The uniformity of intensity, hardness and performance has higher requirement, in the production process of beverage can bottom, if intensity is less than or high Require in regulation, will directly affect the working (machining) efficiency and product quality of product, especially ought the intensity of coil of strip by the gross can not keep equal When even stable, the waste product defect such as crackle is also also easy to produce during the cold deformations such as follow-up punching press, reduces lumber recovery, increase production Cost.At present, most manufacturers generally use series of low-carbon steel grade, but the Series Steel when from beverage can bottom steel The phosphorus content wider range planted, carbon content fluctuation are larger, and the carbon content control scope of material supply producer is 0.01% ~ 0.15%, Large range of carbon content fluctuation causes the less stable of the intensity and plasticity and toughness of material, and the intensity of material is fluctuated, increases The control difficulty of production beverage can bottom product facility is added, in production process, the deformation of beverage can bottom is uneven, the matter to product Amount affects larger, also directly affects the using effect of beverage can bottom product, so production is with proper strength and good The beverage can bottom of the uniform and stable property of performance is significant with steel.
Chinese Patent Application No. discloses " a kind of anti-aging tinning black plate for the patent application of CN200910063723.5 Production method ", its production technology is:Using KR desulfurization → converter smelting → RH stoves application of vacuum → 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.This is special Technical scheme disclosed in profit application has the following disadvantages:(1)In the patent application chemical composition, C content is relatively low, causes which final The low strength of finished product, is not suitable for the production and application of beverage can bottom;In addition, containing a certain amount of in the patent application chemical composition Micro alloying element Ti, and containing higher Mn elements, in embodiment, Mn elements are all higher than 0.29%, so as to cause alloy It is relatively costly.(2)Its annealing process is annealed using Full Hydrogen Bell Type Annealing Furnace, and annealing time is very long, and the patent application specification regulation must Must be more than 10 hours, energy cost is higher, be unfavorable for energy-saving, and reduce production efficiency.(3)The patent adopts perhydro bell-type Furnace annealing, compared with continuous annealing, after annealing, the template of coil of strip is poor, is unfavorable for the production of subsequent handling;And bell furnace After annealing, take the lead, in band, the intensity of magnetic tape trailer differ larger, the less stable of performance, be unfavorable for the production of beverage can bottom.
Chinese Patent Application No. discloses a kind of " producer of tin plate for the patent application of CN201310171001.8 Method ", the C content in the tin plate chemical composition of the patent application publication are relatively low, must carry out RH refining furnaces and take off in production process Carbon process, and in the steel, contain higher Mn elements, also needing in addition the alloying elements such as B, Ti are added in steel, production process is multiple Miscellaneous, production cost is higher.
The content of the invention
It is an object of the invention to provide a kind of beverage can bottom cold-rolled tin plate and its production method, mainly solve existing Beverage can bottom cold-rolled tin plate cracking, stability in the stamping process of manufacture beverage can bottom is poor Technical problem.
The technical solution used in the present invention is:
A kind of beverage can bottom cold-rolled tin plate, chemical component weight percentage ratio: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%, balance of Fe and inevitable impurity element.
The reasons why chemical composition of beverage can bottom cold-rolled tin plate of the present invention is limited within the above range is such as Under:
Carbon:The appropriate C content increased in steel, it is possible to reduce Mn contents, reduces Ar3 transformation temperatures, prevents finish rolling in two-phase section Rolling, contributes to improving plate shape, is conducive to low cost to obtain suitable yield strength, it is ensured that the forming property of material, intensity, just The economy of degree and material.C, Mn content can not be too high, otherwise, easily causes the decline of material punching performance, and easily punching press is opened Split.Therefore, C content range set of the invention is 0.065%~0.085%;
Silicon:Relatively low silicone content, is on the one hand conducive to the coating performance that product is follow-up, and on the other hand, product has been required Higher Al content, is independent of Si element deoxidations.Therefore element silicon is designed 0.005%~0.034%;
Manganese:Mn act as solution strengthening in steel, improves intensity, as punching press material, if Mn too high levels, into Shape hydraulic performance decline, and cost increases, economy declines.Technical solution of the present invention sets Mn content ranges as 0.20%~0.30%;
Phosphorus:P is typically solid-solubilized in ferrite, has very strong solution strengthening effect, and phosphorus also has serious segregation tendency, and Spread in pearlite and ferrite very slow, it is not easy to homogenization and produce high phosphorus band and low-phosphorous band, with steel phosphorus content increase Plus, phosphorus strengthens to the solution strengthening effect of steel, and banded structure increases, and the intensity of steel plate and hardness are raised, and plasticity and tough impatient Acute to decline, forming property degenerates.Technical solution of the present invention sets P≤0.018%;
Sulfur:During Pressing Deformation, sulphide inculsion is cracking first as stress raiser, or makes to be mingled with and gold Category matrix is separated and produces trickle hole, and these holes are constantly grown up with deformation process, and further expanding causes steel plate to ftracture.To protect The certain forming property of card, it is desirable to reduce the sulfur content in steel.Technical solution of the present invention sets S≤0.015%;
Aluminum:Effect of the aluminum in steel is extremely important, and Al and N is combined and generated AlN, and AlN is obtained to cold in annealing process The key factor of favourable { 111 } texture of performance and cheese crystal grain is pulled out, simultaneously because fixations of the AlN to N atoms, makes cold rolling Plate has good aging resistance energy.The Al content range set of the present invention is 0.065%~0.085%.
Nitrogen:Nitride can be formed not only in nitrogen in steel but also can have been dissolved in residual gap after solidification.Performance to steel Affect notable, improve intensity, hardness, plasticity declines.For beverage can bottom steel, nitrogen should be as far as possible low.The N content of the present invention It is set as N≤0.004%.
A kind of production method of beverage can bottom cold-rolled tin plate, is smelted by following Ingredient percents: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%, balance of Fe and inevitable impurity element;Desulfurizing iron, converter top are adopted successively Ar protective castings, heating of plate blank stove heat, roughing, finish rolling, volume are blown in bottom top-bottom blowing, steel ladle bottom argon blowing or LF stove refines, whole process Take acquisition coils of hot-rolled steel, then again uncoiling, Jing pickling, the annealing of cold rolling, vertical continuous annealing furnace, electrotinning, batch and obtain thickness Spend for 0.17mm~0.20mm finished products, it is characterized in that:
1st, the carbon content setting in steel
Increase the C content in steel, it is possible to reduce Mn contents, reduce Ar3 transformation temperatures, prevent finish rolling from rolling in two-phase section, have Help improve plate shape.C, Mn content can not be too high, otherwise, easily causes the decline of material punching performance, and easily stamping cracking, torsion Bent deformation.Therefore, C content range set of the invention is 0.065%~0.085%.
2nd, continuous casting steel billet heating-up temperature setting
AlN and Ti if heating-up temperature is too high, in steel(C、N)Occur after dissolving in hot rolling reeling mistake Deng second phase particles Cheng Chongxin separates out the precipitate of more tiny, disperse, then inhibit the recrystallization of the crystal grain after subsequent cold rolling, annealing to grow up, Raise the recrystallization temperature of steel plate, it is impossible to adapt to low annealing temperature.If heating-up temperature is too low, due in course of hot rolling Natural temperature drop, it is impossible to ensure the finishing temperature of application claims.Continuous casting steel billet heating-up temperature is set as 1030 DEG C~1060 DEG C.
3rd, finish rolling end temp setting
To prevent finish rolling from rolling in two-phase section, finishing temperature need to be higher than Ar3 transformation temperatures, but finishing temperature can not be too high, no The heating-up temperature of continuous casting steel billet must be then improved, increases energy consumption.Therefore, consider, finish rolling end temp of the present invention is set as 851 DEG C~879 DEG C.
4th, hot-rolling coiling temperature setting
Hot-rolling coiling temperature mainly affect materials microstructure, performance and it is cold rolling after continuous annealing recrystallization temperature and stamping Performance.According to relatively low coiling temperature, material recrystallization temperature is improved, and is unfavorable for the carrying out of subsequent anneal, and end of reel temperature The more difficult control of the larger, temperature homogeneity of degree fluctuation, is unfavorable for improving the uniformity of material property;If coiling temperature is higher, no Beneficial to follow-up pickling, crystal grain is grown up, precipitate roughening, although material yield strength is relatively low, but still easily causes punching press and opens Split.Consider, the present invention sets coiling temperature as 640 DEG C~660 DEG C.
5th, cold rolling reduction ratio setting
The present invention using once cold rolling production, compared with secondary cold-rolling with organization of production convenience, low cost, yield height, The advantages of Surface Defects in Steel Plate incidence rate is little.In cold rolling process, the main technologic parameters of decision steel plate material are cold roller and deformed Amount, for general purpose cold-rolling of steel plate deflection is the bigger the better, because big pressure can produce more removable dislocation, can Moving dislocation is higher, and resistance of deformation is less, and stress is not concentrated to crystal boundary, and to adjacent crystal grain transfer deformation, thus be not easy Produce skid wire.In addition, the deformation energy of the bigger generation of deflection it is bigger, tissue unstability it is also higher, so recrystallization temperature Degree is lower, and the crystal grain after recrystallization gets over fine uniform, and the intensity and plasticity of steel plate can be improved.But work as under cold rolling When rate is more than 80%, the grain size of finished product is held essentially constant;In addition, mill load increases obvious when reduction ratio is more than 80%, And cold-rolled process less stable, easily causes production accident.The present invention carry out on 5 Stands Cold Tandem Mills it is cold rolling, can be with The tension force of strip steel is effectively controlled, by suitable cold rolling deformation, can obtain plate shape preferably, yield strength meets the requirements Coiled sheet.Consider, the preferably cold rolling reduction ratio of the present invention is 70%~79%.
6th, annealing temperature setting
In cold-rolled process, crystal grain is elongated metal, and crystal grain orientation changes, and forms the texture of certain type, in crystal Defect can also increase, reflection to the change in mechanical performance, such as:There is the anisotropy of processing hardening, mechanics and physical property Phenomenon etc..Recrystallization annealing process after these defects and change are required for by rolling is eliminated.Therefore, recrystallization annealing is The necessary means of control and change metal material tissue, texture and performance after cold rolling.Roll hard steel in annealing process after cold rolling The recovery and recrystallization and crystal grain of experience three processes of growing up all have influence on end properties.In order that the coil of strip after annealing has Suitable yield strength, the present invention obtain rational annealing temperature by test of many times, and present invention setting steel band is in vertical company The annealing temperature of continuous annealing furnace soaking zone is 560 DEG C~580 DEG C, is set as 95s~105s in the time of soaking zone.
The microscopic structure of the beverage can bottom cold-rolled tin plate that the present invention is obtained is ferrite+free cementite, crystal grain Degree rank is 9~10 grades, and lower yield strength Rel is 365MPa~395MPa, and tensile strength Rm is 430MPa~450MPa, lower to bend Less than 25MPa, the lower yield strength of different steel plate different parts integrally fluctuates also little for the distribution fluctuation that intensity is taken in plate width direction In 30MPa, tensile strength is respectively less than 20MPa in the distribution fluctuation of plate width direction.
The present invention has following good effect compared to existing technology:
1st, the present invention is by carbon content design, hot rolling continuous casting steel billet heating and temperature control, finishing temperature and coiling temperature control System, the control of cold rolling reduction ratio, the optimum organization of continuous annealing furnace annealing temperature and annealing time, it is ensured that beverage can bottom is with cold Roll tin plate yield strength meet require, lower yield strength Rel be 365MPa~395MPa, tensile strength Rm be 430MPa~ 450MPa, microscopic structure is ferrite+free cementite, and plate shape is good, with excellent stamping formabilily, meets beverage can The stamping manufacture demand of bottom.
2nd, expensive alloying elements are not contained in material component, by skill being controlled using cooling controlling and rolling controlling process and reasonable annealing temperature Art is produced, and process is simple, manufacturing cost are relatively low.
Description of the drawings
Accompanying drawing is the metallographic structure photo of beverage can bottom cold-rolled tin plate embodiment of the present invention 1.
Specific embodiment
This enforcement is 0.18mm*836mm from product specification, with reference to embodiment 1 ~ 4 and comparative example --- China is specially Disclosed in the patent application of sharp Application No. CN200510027291.4, the invention will be further described, such as 1 ~ table of table, 4 institute Show.
1 chemical composition of the present invention of table(Percentage by weight %), balance of 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
Obtain meeting the requirements the continuous casting billet of chemical composition by converter melting, and thickness is 210~230mm, and width is 800~ 1300mm, length are 5000~10000mm.Compared with the present invention, the C content of comparative example is relatively low, lower by 1 than the C content of the present invention The individual order of magnitude, must carry out RH refining furnace carbonization treatments, in addition it is also necessary to oxygen content is controlled, production process is multiple in production process Miscellaneous, in addition to obtaining enough intensity, comparative example need to add the expensive alloying elements such as Ti in steel, and production cost is higher.
The scale slab of STEELMAKING PRODUCTION delivers to heating furnace reheating, delivers to and roll on continuous hot tandem rolling mill after dephosphorization of coming out of the stove System.After roughing milling train and finish rolling Continuous mill train controlled rolling, then batched, qualified coils of hot-rolled steel output.Hot-roller Skill control is shown in Table 2.
2 hot rolling technology control parameter of the present invention of table
Hot Rolling Parameters Slab heating temperature(℃) Finish rolling end temp(℃) Finish rolling compression ratio(%) Coiling temperature(℃)
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, the slab heating temperature and finish rolling end temp of comparative example is higher, Energy cost is higher, is unfavorable for energy-saving, and the high surface of temperature easily produces iron scale, affects the surface matter of final products Amount;In order to obtain enough intensity, the coiling temperature of comparative example is relatively low;Comparative example is not limited to finish rolling compression ratio, it is not easy to Produce that performance is controlled and the product of stable performance.
By above-mentioned coils of hot-rolled steel again uncoiling after pickling, carry out on reversable mill or 5 Stands Cold Tandem Mills it is cold rolling, Cold rolling reduction ratio is 70%~79%, and the steel band for rolling hard state after cold rolling is annealed, electroplated through vertical continuous annealing furnace Stannum, batch the finished product cold-rolled strip for obtaining thickness 0.18mm.Annealing process is:Soaking zone of the steel band in vertical continuous annealing furnace Annealing region is 560 DEG C~580 DEG C, is 95s~105s in the time of soaking zone.Process control parameter is shown in Table 3.
3 cold rolling, annealing process control parameter of the invention of table
Cold rolling, annealing parameter Cold rolling reduction ratio(%) Annealing temperature(℃) The 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 is unfavorable for template control far above the present invention System, and the product strength for producing is relatively low, is not suitable for the production of beverage can bottom.
The beverage can bottom cold-rolled tin plate obtained using said method.Referring to the drawings 1, the cold rolling plating of beverage can bottom The microscopic structure of sheet tin be ferrite+free cementite, grain size number be 9~10 grades, lower yield strength Rel be 365MPa~ 395MPa, tensile strength Rm are 430MPa~450MPa.
The strength character that beverage can bottom cold-rolled tin plate is obtained using said method is shown in Table 4 ~ table 5.
Distributions of the lower yield strength ReL (MPa) of 4 steel plate of the present invention of table in plate width direction
Distribution of tensile strength Rm (MPa) of 5 steel plate of the present invention of table in plate width direction
From above-described embodiment as can be seen that the single embodiment of mechanical property important indicator lower yield strength of embodiment 1~4 25MPa is less than in the distribution fluctuation of plate width direction, the lower of different steel plate different parts is bent from material whole steel plate on the whole Take intensity integrally to fluctuate again smaller than 30MPa, tensile strength is respectively less than 20MPa in the distribution fluctuation of plate width direction, it is ensured that strip steel Properties of product are uniform, plate shape is good, with excellent stamping formabilily, meet the stamping manufacture demand of beverage can bottom. Although a certain amount of V-N steel element ti is added in comparative example, because its C content is very low, and its annealing temperature compared with Height, causes the yield strength of its finished product tin plate to be less than 370MPa less than 280MPa, tensile strength, and low strength is not suitable for using To manufacture beverage can bottom.
In addition to the implementation, the present invention can also have other embodiment.All employing equivalents or equivalent transformation shape Into technical scheme, all fall within the protection domain of application claims.

Claims (1)

1. a kind of production method of beverage can bottom cold-rolled tin plate, is smelted by following Ingredient percents: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%, balance of Fe and inevitable impurity element;Desulfurizing iron is adopted successively, turned Ar protective castings, heating of plate blank stove heat, roughing, essence are blown in stove top bottom blowing, steel ladle bottom argon blowing or LF stove refines, whole process Roll, batch acquisition coils of hot-rolled steel, then again uncoiling, Jing pickling, the annealing of cold rolling, vertical continuous annealing furnace, electrotinning, batch To finished product, it is characterized in that:Continuous casting steel billet heating-up temperature is 1030 DEG C~1060 DEG C, is rolled on continuous hot-rolling mill, finish rolling knot Shu Wendu is 851 DEG C~879 DEG C, and finish rolling compression ratio is 75%~80%, and after finish rolling, coiling temperature is 640 DEG C~660 DEG C, cold rolling Reduction ratio is 70%~79%, after cold rolling rolls annealing temperature of the hard state strip steel in the soaking zone of vertical continuous annealing furnace For 560 DEG C~580 DEG C, strip steel is 95s~105s in the time of soaking zone.
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CN106917039B (en) * 2015-12-28 2019-09-17 上海梅山钢铁股份有限公司 A kind of flash plating cold rolling tin plate and its manufacturing method
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
CN109385569B (en) * 2017-08-10 2020-12-08 上海梅山钢铁股份有限公司 High-hardness cold-rolled electrotinning steel plate and production method thereof
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
CN110724884B (en) * 2019-10-10 2020-11-27 柳州钢铁股份有限公司 Manufacturing method of low-cost cold-rolled high-strength steel for goods shelves
CN110699608B (en) * 2019-10-10 2020-11-27 柳州钢铁股份有限公司 Low-cost cold-rolled high-strength steel for goods shelves
CN111455290A (en) * 2020-04-15 2020-07-28 深圳市兴鸿泰锡业有限公司 Tin plate and production method thereof
CN111534757B (en) * 2020-05-11 2021-09-21 首钢集团有限公司 Steel for packaging, production method thereof and packaging product

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CN102766800A (en) * 2011-05-05 2012-11-07 上海梅山钢铁股份有限公司 Steel for hard tinplate bottle caps and production method thereof

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