CN101657556B - Flexible tin-plated steel sheet and process for producing the same - Google Patents
Flexible tin-plated steel sheet and process for producing the same Download PDFInfo
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- CN101657556B CN101657556B CN2008800120186A CN200880012018A CN101657556B CN 101657556 B CN101657556 B CN 101657556B CN 2008800120186 A CN2008800120186 A CN 2008800120186A CN 200880012018 A CN200880012018 A CN 200880012018A CN 101657556 B CN101657556 B CN 101657556B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Abstract
A slab having a steel composition which contains up to 0.0020 mass% carbon and further contains boron and nitrogen so as to satisfy at least either of a boron/nitrogen mass ratio of 1.5 or higher and a content of boron in solution of 5 ppm or higher, with the remainder being iron and incidental impurities, is subjected to hot rolling, cold rolling, and annealing. Thereafter, the resultant sheet is subjected to secondary cold rolling at a draft of 1.3-3.5%. Thus, a flexible tin-plated steel sheet is obtained which has a hardness of 52-60 in terms of HR30T.
Description
Technical field
The present invention relates to adopt the flexible tin-plated steel sheet and the method for manufacture thereof of continuous annealing manufactured.
The application serves as for 2007-109332 number the basis application with the special hope of Japan, quotes its content.
Background technology
As beverage with or the jar used of food etc. in the flexible tin-plated steel sheet from T-1 to T-3 of regulation among the employed JIS G 3303, made through the long term annealing of employing batch annealing (BAF) in the past.This is because be necessary through making grain growth, making starting material softening and C or the N of solid solution in steel fully separated out obtain the what is called " non-timeliness material " that has prevented age hardening or stretching slippage.On the other hand, be accompanied by the aggravation that cost lowers the requirement, adopt the method for manufacture of process number BAF many, long in time limit to be kept someone at a respectful distance gradually, begin to adopt the continuous annealing method that can obtain the steel of even material in large quantities with the short period of time.The continuous annealing method is with opening the steel band that obtains behind the coiled material method through heating in the stove continuously, but the annealing time weak point is difficult to obtain non-timeliness material.Therefore, in the past, the continuous annealing method is used for the above zinc-plated steel plate of using of hard of T-4 basically.; In recent years; Progress along with the preconditioning technique of steel; Can make the ultralow carbon steel (Interstitial atom Free steel is designated hereinafter simply as " IF ") that the content of the C that makes in advance in the steel or N reduces easily, thus also can such from T-1 to T-3 soft zinc-plated with steel plate employing continuous annealing method.
But; The IF steel makes that because of solid solution element is few starting material are very soft; Although the flexible tin-plated steel sheet of T-2 can both be made than being easier to; But obtain the hard slightly tin plate of material of T-3 degree, need heavy addition Mn, P, Si etc. to have the element (hardening element) of sclerization or carry out work hardening through improving secondary cold-rolling rate (modulating rolling rate).
In the means of the problem that solves such IF steel, the method as adding hardening element for example, discloses in ultralow carbon steel in patent documentation 1 and has added B, is the technology that the addition of Mn is adjusted hardness according to hardening element.In addition, as the method that makes steel work hardening, for example, in patent documentation 2, disclose by surpassing 4.0% and make the technology of the ultralow carbon steel work hardening that is added with B smaller or equal to the rolling rate of 6.0% modulation.
Patent documentation 1: japanese kokai publication hei 9-227947 communique
Patent documentation 2: TOHKEMY 2001-247917 communique
But, in patent documentation 1, in the technology of record, carry out the adjustment of hardness, but be in the ASTM standard in the standard of common steel plate for tanks through the addition of Mn, from the viewpoint of erosion resistance, the addition of Mn has 0.6% upper limit restriction.Thereby, added 0.6% Mn even exist, can not obtain the problem of tin plate of material of the hard slightly (hardness counts 52～60 with HR30T) of T-3 degree.Moreover so-called HR30T is the generally definition of used Rockwell hardness in the tin plate, and measuring method adopts the method for regulation among the JIS Z 2245.
In addition; In the technology of in patent documentation 2, putting down in writing (work hardening method); To modulate rolling rate is defined as above 4.0% and smaller or equal to 6.0%; But realize this target, repeatedly repeat to modulate rolling process or to adopt rolling mill compound to suppress the method for manufacture (method of manufacture that is called " DCR (Double Cold Rolling) " or " HRT (Heavy Redution Temper) ") down do not have real method except adopting.Repeatedly repeat to modulate rolling method certainly, but not preferred on cost.In addition, adopting rolling mill compound to suppress in the method down, because of the starting material of IF steel are that soft the generation too extended or be difficult to the controlled rolling condition, so existence can not be guaranteed stable draft or problem that can not machining shape.
Moreover; The speech of all lubricants that the term that is called in this manual, " rolling mill compound " extensively adopts in rolling as the modulation of the aqueous solution general tin plates such as (" チ ノ one Le " of for example Japanese Quaker Chemical corporate system) of expression tallow base emulsion (for example Japanese Quaker Chemical corporate system " Network エ one Network ロ one Le ") or synthetic ester base uses.
In addition, for as the employed IF steel of the mother metal of flexible tin-plated steel sheet, generally, add C and the N of solid solution in steel Ti or Nb for being separated out.The fine recrystallization temperature that makes steel of separating out through this Ti or N rises, and therefore needs the pyritous annealing temperature more than 700 ℃.For this reason, in the thin tin plate of thickness of slab, in the stove of the continuous annealing of being everlasting, be called " hot wooden dipper is bent " sheet material wrinkle (heatbuckling) in the logical plate, make the goods yield rate reduce more.
Like this, for the continuous annealingization of the zinc-plated IF steel of booming employing, also not having so far to propose can be easily and in industry, stably provide hardness to count creating conditions of 52～60 tin plate with HR30T in the attainable scope.
Summary of the invention
The present invention is In view of the foregoing and accomplishes, the flexible tin-plated steel sheet that its purpose is to utilize the continuous annealing method of having used the IF steel to provide hardness to count 52～60 comparison hard with HR30T, and be provided for obtaining easily the method for manufacture of this flexible tin-plated steel sheet.
Present inventors etc. further investigate for addressing the above problem; The result finds: through the ratio of components of the element in the adjustment flexible tin-plated steel sheet; Can improve mother metal is the intensity of IF steel, and can realize utilizing continuous annealing manufactured hardness to count 52～60 flexible tin-plated steel sheet with HR30T.Accomplished the present invention based on this discovery.
That is to say that the present invention is following as the part of its main idea.
(1) a kind of flexible tin-plated steel sheet; Wherein, Said flexible tin-plated steel sheet has following steel and forms: contain the C below the 0.0020 quality %; According to satisfying B/N >=1.5 and solid solution B by quality ratio is that at least one side's in more than the 5ppm mode further contains B and N, and surplus contains Fe and unavoidable impurities; The hardness of said flexible tin-plated steel sheet counts 52～60 with HR30T.
(2) a kind of flexible tin-plated steel sheet, wherein, it is through to having after slab that following steel forms implemented hot rolling, cold rolling, annealing, the draft with 1.3%～3.5% carries out secondary cold-rolling and obtains; Wherein said steel consists of: containing the C below the 0.0020 quality %, is that at least one side's in more than the 5ppm mode further contains B and N according to satisfying B/N >=1.5 and solid solution B by quality ratio, and surplus contains Fe and unavoidable impurities.
(3) according to above-mentioned (2) described flexible tin-plated steel sheet, wherein, hardness counts 52～60 with HR30T.
(4) according to each described flexible tin-plated steel sheet in above-mentioned (1)～(3), wherein, the addition of B is below the 0.020 quality %.
(5) according to each described flexible tin-plated steel sheet in above-mentioned (1)～(3); Wherein, Form as steel, further contain be selected from below the Si:0.05 quality %, Mn:0.20 quality %～0.60 quality %, below the P:0.020 quality %, below the S:0.020 quality %, Al:0.010 quality %～0.10 quality %, the element more than a kind or 2 kinds among below the Cr:0.10 quality %, below the Ti:0.01 quality %, below the Nb:0.01 quality %.
(6) a kind of method of manufacture of flexible tin-plated steel sheet is characterized in that, to having after slab that following steel forms implemented hot rolling, cold rolling, annealing, the draft with 1.3%～3.5% carries out secondary cold-rolling; Wherein, said steel consists of: containing the C below the 0.0020 quality %, is that at least one side's in more than the 5ppm mode further contains B and N according to satisfying B/N >=1.5 and solid solution B by quality ratio, and surplus contains Fe and unavoidable impurities.
(7) according to the method for manufacture of above-mentioned (6) described flexible tin-plated steel sheet; Wherein, Form as steel, further contain be selected from below the Si:0.05 quality %, Mn:0.20 quality %～0.60 quality %, below the P:0.020 quality %, below the S:0.020 quality %, Al:0.010 quality %～0.10 quality %, the element more than a kind or 2 kinds among below the Cr:0.10 quality %, below the Ti:0.01 quality %, below the Nb:0.01 quality %.
(8) according to the method for manufacture of above-mentioned (6) or (7) described flexible tin-plated steel sheet, wherein, adopt heat-up rate to be lower than 300 ℃/second continuous annealing apparatus, under 650 ℃～700 ℃ temperature, carry out said annealing.
According to flexible tin-plated steel sheet of the present invention and method of manufacture thereof, that the continuous annealing method with in the past employing IF steel of can obtaining easily can not obtain, non-timeliness and hardness are counted the flexible tin-plated steel sheet of 52～60 comparison hard with HR30T.So, according to the present invention, can utilize the flexible tin-plated steel sheet of continuous annealing manufactured T-3 degree, thereby can under the situation of the tin plate that obtains the comparison hard, also improve yield rate, and realize the reduction of cost.
Embodiment
Below, preferred embodiment be elaborated to of the present invention.
< formation of flexible tin-plated steel sheet of the present invention >
Flexible tin-plated steel sheet of the present invention is the slab that adopts the steel composition with regulation; After it having been implemented hot rolling, cold rolling, annealing, carry out hardness that secondary cold-rolling (modulating rolling) obtains is counted 52～60 (being the T-3 degree) with HR30T tin plate through draft with regulation.
(forming) about steel
Below, the steel of the slab that uses as the mother metal of flexible tin-plated steel sheet of the present invention formed describe.Above-mentioned slab is as the composition in the steel; Can mainly contain carbon (C), boron (B), nitrogen (N), silicon (Si), manganese (Mn), phosphorus (P), sulphur (S), aluminium (Al) etc., surplus contains Fe and unavoidable impurities, and; In these compositions, with C, B, these 3 kinds of elements of N as essential composition.Be described below about the content of these compositions in slab.
[about C]
The content that becomes the C in the slab of mother metal of flexible tin-plated steel sheet of the present invention need be below 0.0020 quality %.
Its reason be because: many yield extensions rate (YP-EL) is high more more for the C amount of general solid solution in steel; Become age hardening easily or add the reason of the stretching slippage in man-hour; Thereby utilizing the continuous annealing method to obtain among the present invention of flexible tin-plated steel sheet, need control with content in the system steel stage and be suppressed at the low level of trying one's best C.Particularly, below being defined in 0.0020 quality %, the content of C is based on following reason.That is to say be because, for example in the processing of common system jar, if YP-EL is below 2%; Although do not find the stretching slippage, under the situation of upper and lower plates (lid) purposes that is used for jar, if YP-EL is not below 1.4%; The sclerosis that causes because of timeliness changes, and the steel plate after the punching press produces warpage sometimes, on the other hand; If the C amount of solid solution in steel surpasses 0.0020 weight %, then the probability that reaches more than 1.4% of YP-EL is very high.In addition, if consider that the solid solution C amount in the steel in system steel stage preferably is defined as below the 0.0010 quality % from the sneaking into of the C of the refractory body in when casting etc.
[about B, N]
In addition, about B and the N in the slab of the mother metal that becomes flexible tin-plated steel sheet of the present invention, need contain according to the mode that B/N by quality ratio reaches more than 1.5.
B, N are the element with most important effect in the present invention.B is through combining with the N of solid solution in steel and separating out with the form of BN; Not only can prevent age hardening; And, think that separating out the superfluous B that adds in aequum ground more than or equal to BN has also that to make mother metal be the effect of the crystal grain miniaturization in the slab according to present inventor's etc. research.Think that this is because the superfluous B that adds is present in the crystal boundary with the form of solid solution B, suppresses the growth of crystal grain.Consequently, the hardness of mother metal rises, can obtain having the T-3 degree flexible tin-plated steel sheet of hardness of (HR30T is 52～60).Here; So-called solid solution B is not separating out with the form of the compound of other element and to be present in the B in the steel with solid solution condition, and its amount can be measured and obtains (solid solution B=BToal-BasBN) through from the total amount of the B that added, deducting the B that is separated out with the form of BN.The total amount of B and the amount of BN can be utilized common chemical dissolution method to wait and measure.In addition, can obtain with the mathematical expression of solid solution B (quality %)=B (content, quality %)-10.8/14.0 * N (content, quality %) easily.
In order to bring into play the raising effect of the mother metal hardness that such crystal grain miniaturization produces; Need be after BN is separated out there be B in a large number with the form of solid solution B again, waits the test-results of carrying out to draw following opinion: need B/N >=1.5 by quality ratio and/or have the B more than the 5ppm at least with the form of solid solution B from present inventor.Moreover, in above-mentioned patent documentation 1, proposed B to be added to the method for 24ppm (B/N＜0.8) for the hardness that improves mother metal.But,,, can not obtain the raising effect of the mother metal hardness of crystal grain miniaturization generation owing to there is not solid solution B even can fix N with the form of BN by this B amount.Like this, to the effective solid solution B of crystal grain miniaturization need be preferably more than the 40ppm, more preferably more than the 50ppm, further be preferably more than the 60ppm, most preferably be more than the 70ppm, the amount that further most preferably is more than the 80ppm exists.
In addition; Utilize the result of B fix N to show; Because because of the BN that separates out makes embrittlement of grain boundaries, thereby the crackle when worrying slab casting causes metallurgical imperfection or can not cast its body because of the strand in the casting machine ruptures, so the addition of B preferably is defined as below the 100ppm (0.010 quality %).Consequently, the lower limit of B/N is preferably more than 1.5, more preferably more than 1.6, further be preferably more than 1.7, most preferably be more than 1.8, in addition the upper limit be preferably below 4.0, more preferably below 3.0, most preferably be below 2.0.If B/N is lower than 1.5, then there is not the solid solution B of significant quantity at crystal boundary, can not obtain the effect of miniaturization.If B/N surpasses 4.0 in addition, then produce above-mentioned can not cast or too hard etc. is bad.
[about Si]
In addition, the content that becomes the Si in the slab of mother metal of flexible tin-plated steel sheet of the present invention is preferably below the 0.05 quality %.This be because, if generally too much contain Si, then make the erosion resistance of mother metal descend, the upper limit of the therefore preferred in the present invention content with the Si that contains in the mother metal is defined as 0.05 quality %.In addition, particularly be used for the requirement erosion resistance and filling under the situation of jar etc. of content, more preferably the content with Si is defined as below the 0.03 quality %.
[about Mn]
In addition, the content that becomes the Mn in the slab of mother metal of flexible tin-plated steel sheet of the present invention is preferably 0.20 quality %～0.60 quality %.Therefore the hardization of the steel that Mn can promote to be added need add more than the 0.20 quality % at least, more preferably adds more than the 0.40 quality %.On the other hand, if add a large amount of Mn, then the erosion resistance of mother metal reduces, and therefore as defined among the ASTM, preferably the upper limit with the content of Mn is defined as 0.6 quality %.
[about P]
In addition, the content that becomes the P in the slab of mother metal of flexible tin-plated steel sheet of the present invention is preferably below the 0.020 quality %.For P, it makes the steel that added hardization significantly, and erosion resistance is descended, and therefore in the present invention, identical with situation in the common method of manufacture of tin plate, preferably the content with P is defined in below the 0.020 quality %.In addition, under the situation of the purposes that is used for the special demands erosion resistance, more preferably the content with P is defined in below the 0.015 quality %.
[about S]
In addition, the content that becomes the S in the slab of mother metal of flexible tin-plated steel sheet of the present invention is preferably below the 0.020 quality %.This be because, S makes the steel embrittlement as inclusion, and erosion resistance is descended, so in the present invention, identical with situation in the common method of manufacture of tin plate, preferably the content with S is defined in below the 0.020 quality %.
[about Al]
In addition, the content that becomes the Al in the slab of mother metal of flexible tin-plated steel sheet of the present invention is preferably 0.010 quality %～0.10 quality %.Al adds as the deoxidation material of system steel in the stage, and in order to obtain the deoxidation sclerosis, preferably the content with Al is defined in more than the 0.010 quality %.On the other hand, Al and solid solution C are same, and having to make becomes the sclerosis that the solid solution of age hardening reason N separates out formation, if but heavy addition, then worry produces the metallurgical imperfection of alumina series, and therefore preferred content with Al is defined in below the 0.10 quality %.
[about Cr]
In addition, the content that becomes the Cr in the slab of mother metal of flexible tin-plated steel sheet of the present invention is preferably below the 0.10 quality %.Cr does not have big influence to raw-material mechanical characteristics; But when adopting Cr as the surface treatment of tin plate; If Cr is many in the steel, then become the interference factor of online Cr adhesion amount meter, the surface-treated quality of strict management is reduced; And the upper limit with Cr in the ASTM standard is defined as 0.10 quality %, so preferably the content of Cr is defined as below 0.10 quality.
[about Ti, Nb]
In addition, become the Ti in the slab of mother metal of flexible tin-plated steel sheet of the present invention, the content of Nb is preferably respectively below the 0.01 quality %.As previously mentioned, the IF steel that uses as the mother metal of flexible tin-plated steel sheet rises to more than 700 ℃ the recrystallization temperature of steel through separating out for making C and the N of solid solution in steel separate out the Ti or the fine of Nb of adding.In the present invention,, utilize vacuum outgas method etc. to make it below 0.0020 quality %,, its form with BN is separated out and innoxious, therefore do not need actively to add Ti or Nb through adding B about solid solution N in the molten steel stage about solid solution C.So, for annealing temperature is suppressed at low temperature, improve industrial productivity, preferably the content separate provision with Ti, Nb is below the 0.01 quality %.
[about other chemical ingredients]
As the composition of flexible tin-plated steel sheet of the present invention, except that mentioned component, can also contain in following each composition element more than a kind or 2 kinds; That is: below the Cu:0.1%, be preferably below 0.01%; Below the Ni:0.1%, be preferably below 0.01%, below the Mo:0.05%, be preferably below 0.005%, below the Zr:0.05%, be preferably below 0.005%; Below the V:0.1%, be preferably below 0.01%, below Ca or the Mg:0.003%, be preferably below 0.0005%.
< method of manufacture of flexible tin-plated steel sheet of the present invention >
More than the formation of flexible tin-plated steel sheet of the present invention is illustrated, be elaborated in the face of method of manufacture down with the flexible tin-plated steel sheet of the present invention that so constitutes.
In the method for manufacture of flexible tin-plated steel sheet of the present invention; After the slab that steel with above-mentioned that kind is formed is implemented hot rolling, pickling, cold rolling, annealing successively; Draft with 1.3%～3.5% carries out secondary cold-rolling (modulating rolling), makes the relatively flexible tin-plated steel sheet of hard.
(hot rolling, pickling, cold rolling)
Hot rolling in the above-mentioned manufacturing process, pickling, cold rolling can under common iron and steel is created conditions, carrying out.For example, after slab being heated to 1000 ℃～1300 ℃, adopt equipment of hot rolling such as hot strip mill; Final rolling temperature is defined as 800 ℃～1000 ℃; Be rolled down to the thickness of 1.8mm～4.0mm, coiling temperature is defined as 400 ℃～800 ℃, thereby make hot-rolled steel sheet.Then, adopt hydrochloric acid etc. to carry out pickling and adopt cold-rolling equipments such as cold-strip mill to be rolled down to the operation of the thickness of 0.1mm～0.6mm at normal temperatures.
(annealing)
Annealing be softening with the structure of steel that has made because of cold rolling work hardening through recrystallize, material adjusted to can make jar etc. be processed as purpose and carry out.As the mother metal of flexible tin-plated steel sheet of the present invention and the IF steel that uses as previously mentioned; Through for C and the N of solid solution in steel separated out; Improve the Ti or the fine of Nb of being added and separate out, the recrystallization temperature of steel is risen, therefore annealing temperatures that need more than 700 ℃ more., do not contain Ti or Nb as the composition of flexible tin-plated steel sheet of the present invention, recrystallization temperature does not rise yet, so annealing temperature is as long as just can at 650 ℃～700 ℃.On the other hand, steel does not carry out recrystallize when annealing temperature is lower than 650 ℃, and is therefore not preferred, and the bent problem of the hot wooden dipper of easy generation is arranged when annealing temperature surpasses 700 ℃, therefore not preferred.In addition, because the supply of heat is less relatively just passable like this,, also has effect aspect the thermal source countermeasure therefore as accessory effect.Moreover the heat-up rate the during annealing of IF steel of the present invention can be equal with used ordinary process in the common industrial production, its value be preferably be lower than 300 ℃/second, more preferably be lower than 200 ℃/second, most preferably be and be lower than 100 ℃/second.Soaking time can be the common annealing condition about 20 seconds～100 seconds too.
(secondary cold-rolling)
In secondary cold-rolling of the present invention (modulating rolling) operation,, then can not stably produce steel plate as stated if adopt rolling mill compound (being called the so-called WET pressure regulation of " DCR " or " HRT ").Therefore, do not adopt rolling mill compound, the so-called DRY pressure regulation of enforcement in the present invention.Moreover; Technology when present inventor etc. have studied the IF steel after the continuous annealing adopted the secondary cold-rolling of rolling mill compound; And carried out the checking on actual milling train; The result shows that above-mentioned steel plate extension not only took place, the bad or steel plate shape defect of thickness of slab control takes place, and extreme decline of rolling load and the danger that can not be rolling etc. of automatic control are arranged, thereby thinks and in industry, be difficult to use.
Secondary cold-rolling among the present invention need carry out with 1.3%～3.5% draft (modulating rolling rate).The reason that needs the draft 1.3% or more be because: this is that the original purpose of carrying out secondary cold-rolling is that the transfer printing of reduction, shape correction and roll surface roughness of YP-EL is necessary or can not obtain counting the hardness more than 52 with HR30T with the following draft of this degree.Have again,, preferably carry out work hardening with the high draft of trying one's best for true enough hardness.But; With common employed two-shipper rolling mill and when carrying out the DRY pressure regulation as the pressure regulation milling train of zinc-plated usefulness; Because relation according to roller rigid and rolling load; Aspect capacity of equipment, about 3.5% become the boundary of rolling rate, and the draft in the time of therefore will carrying out secondary cold-rolling in the present invention is defined as 1.3%～3.5%.
After the slab that the steel with above explanation is formed has been implemented hot rolling, pickling, cold rolling, annealing successively; Under the condition of above explanation state, carry out secondary cold-rolling (modulate rolling), can make that the continuous annealing method of usefulness employing IF steel in the past can not obtain, non-timeliness and hardness thus with HR30T count 52～60 flexible tin-plated steel sheet of comparison hard of (being the T-3 degree).
Embodiment
Then, the present invention is explained more specifically, but the present invention is not limited in following embodiment with embodiment.
(manufacturing of flexible tin-plated steel sheet)
At first, the manufacturing example to the flexible tin-plated steel sheet that utilizes method of manufacture manufacturing of the present invention describes.
Casting has the slab of the steel A～D series of composition shown in following table 1 and the table 2; After these slabs are heated to 1235 ℃; Adopting hot strip mill, is that 900 ℃ and coiling temperature are under 650 ℃ the condition at final rolling temperature, and the finish rolling thickness of slab of hot rolling after rolling is 3.0mm.Then, the steel band after this hot rolling is carried out pickling, after being cold rolled to finish rolling thickness of slab after rolling and being 0.25mm, under 680 ℃ and 640 ℃ of these two kinds of temperature condition, anneal with continuous annealing furnace.Having, to the steel plate after the annealing, is to carry out secondary cold-rolling under 3% and 5% these two kinds of conditions in the rolling rate of modulation again.In addition, be under 3% the condition in the rolling rate of modulation, do not use the DRY pressure regulation of rolling mill compound; In the rolling rate of modulation is under 5% the condition, uses the WET pressure regulation of rolling mill compound.Rolling mill compound during as the WET pressure regulation adopts チ ノ one Le with Japanese Quaker Chemical corporate system to dilute the rolling mill compound that forms with pure water by 0.2%.
Employing rolling mill compound in the above-mentioned secondary cold-rolling condition is 5% to have carried out the sample of secondary cold-rolling owing to can not be rolled control from rolling after just having begun by the rolling rate of modulation, so ended secondary cold-rolling.Can be by this phenomenon of following explanation.So long as common steel, just can with the hardness balance ground of the steel load and the tension force of controlled rolling frame automatically, stably guarantee the rolling rate of the modulation of setting., because the IF steel is soft,, also can carry out rolling by force above the rolling rate of modulation that sets even therefore the load or the tensile initial setting of frame are lower than usually.So; Although can alleviate load or tension force continuously through automatic control; But because therefore trim point does not appear in the soft property raising of IF steel, rolling rate continues to increase; Finally exceed the automatic span of control of load or tensile, formation can not be distinguished the state of controlled rolling rate, thickness of slab, shape.Present inventors etc. are conceived to lubricating condition, and it is rolling only to adopt the high pure water of frictional coefficient to implement above-mentioned modulation as rolling mill compound, but the result does not change.For the sample beyond above-mentioned, behind secondary cold-rolling, press 1000mg/m
2Adhesion amount implemented zinc-plated processing.
Moreover, steel shown in table 1 and the table 2 form be adopt solid luminescence spectrum analysis (QV) method analyzed usually, and JIS G 1211,1215 in the methylene blue Their Determination by Spectrophotometry of regulation in the infrared absorption, JIS G 1227 of regulation.
(mensuration of hardness and yield extension rate)
For tin plate by above manufacturing, utilize the method for regulation among the JIS Z 2245 to measure hardness (HR30T), utilize the method for regulation among the JIS Z 2241 to measure yield extension rate (YP-EL).Moreover, for hardness and yield extension rate, all be after 210 ℃ that give through common application sintering, 30 minutes thermal treatment, to measure.
As stated, for tin plate, the mensuration result of hardness (HR30T) and yield extension rate (YP-EL) is shown in the lump in table 1 and the table 2.
Can know following content from above-mentioned table 1 and table 2.That is, be B/N >=1.5 and/or the steel of solid solution B more than 5ppm by quality ratio, have HR30T and be 52～60 enough hardness for the B that belongs in the scope of the present invention and N are reached, and YP-EL also major part be 0.0, no problem.On the other hand, for B/N be lower than 1.5 and solid solution B be lower than the No.B 12 of 5ppm, HR30T is 50, the hardness of tin plate is not enough.In addition, be lower than 1.3% No.B6, B8, B9 for the draft of secondary cold-rolling, HR30T is 51, and the hardness of tin plate is not enough.The B1 that surpasses 0.0020 quality % for the content of C is arranged again, and age hardening takes place in YP-EL height to 1.8.
More than, preferred embodiment being illustrated of the present invention, the present invention is not limited in above-mentioned example certainly.Those skilled in the art know and expect various changes example in the scope that can in claims, put down in writing or revise example that these all belong to technical scope of the present invention certainly.
According to the present invention, can utilize the flexible tin-plated steel sheet of continuous annealing manufactured T-3 degree, thereby can under the situation of the tin plate that obtains the comparison hard, also improve yield rate, the reduction of realization cost.
Claims (8)
1. a flexible tin-plated steel sheet is characterized in that, said flexible tin-plated steel sheet has following steel and forms:
Contain the C below the 0.0020 quality %,
According to satisfying solid solution B is that more than the 5ppm and by quality ratio the mode of B/N >=1.7 further contains B and N,
Surplus contains Fe and unavoidable impurities;
The hardness of said flexible tin-plated steel sheet counts 52～60 with HR30T.
2. a flexible tin-plated steel sheet is characterized in that, it is through to having after slab that following steel forms implemented hot rolling, cold rolling, annealing, and the draft with 1.3%～3.5% carries out secondary cold-rolling and obtains; Wherein, said steel consists of:
Contain the C below the 0.0020 quality %,
According to satisfying solid solution B is that more than the 5ppm and by quality ratio the mode of B/N >=1.7 further contains B and N,
Surplus contains Fe and unavoidable impurities.
3. flexible tin-plated steel sheet according to claim 2 is characterized in that hardness counts 52～60 with HR30T.
4. according to each described flexible tin-plated steel sheet in the claim 1～3, it is characterized in that the addition of B is below the 0.020 quality %.
5. according to each described flexible tin-plated steel sheet in the claim 1～3; It is characterized in that; Form as steel, further contain be selected from below the Si:0.05 quality %, Mn:0.20 quality %～0.60 quality %, below the P:0.020 quality %, below the S:0.020 quality %, Al:0.010 quality %～0.10 quality %, below the Cr:0.10 quality %, below the Ti:0.01 quality % and the element more than a kind or 2 kinds among below the Nb:0.01 quality %.
6. the method for manufacture of a flexible tin-plated steel sheet is characterized in that, to having after slab that following steel forms implemented hot rolling, cold rolling, annealing, the draft with 1.3%～3.5% carries out secondary cold-rolling;
Wherein, said steel consists of:
Contain the C below the 0.0020 quality %,
According to satisfying solid solution B is that more than the 5ppm and by quality ratio the mode of B/N >=1.7 further contains B and N,
Surplus contains Fe and unavoidable impurities.
7. the method for manufacture of flexible tin-plated steel sheet according to claim 6; It is characterized in that; Form as steel, further contain be selected from below the Si:0.05 quality %, Mn:0.20 quality %～0.60 quality %, below the P:0.020 quality %, below the S:0.020 quality %, Al:0.010 quality %～0.10 quality %, below the Cr:0.10 quality %, below the Ti:0.01 quality % and the element more than a kind or 2 kinds among below the Nb:0.01 quality %.
8. according to the method for manufacture of claim 6 or 7 described flexible tin-plated steel sheets, it is characterized in that, adopt heat-up rate to be lower than 300 ℃/second continuous annealing apparatus, under 650 ℃～700 ℃ temperature, carry out said annealing.
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| JP2007109332 | 2007-04-18 | ||
| JP109332/2007 | 2007-04-18 | ||
| PCT/JP2008/057501 WO2008133175A1 (en) | 2007-04-18 | 2008-04-17 | Flexible tin-plated steel sheet and process for producing the same |
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| JP5272714B2 (en) * | 2008-12-24 | 2013-08-28 | Ｊｆｅスチール株式会社 | Manufacturing method of steel plate for can manufacturing |
| JP5810714B2 (en) * | 2011-07-29 | 2015-11-11 | Ｊｆｅスチール株式会社 | High-strength, high-formability steel plate for cans and method for producing the same |
| CN102912227A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Soft tinning raw steel plate and manufacture method thereof |
| CN102912218A (en) * | 2012-10-23 | 2013-02-06 | 鞍钢股份有限公司 | Tinned raw-steel plate with excellent stamping property and method for manufacturing tinned raw-steel plate |
| MY179722A (en) * | 2014-03-28 | 2020-11-11 | Jfe Steel Corp | Steel sheet for can and method for manufacturing the same |
| CN106086643B (en) * | 2016-06-23 | 2018-03-30 | 宝山钢铁股份有限公司 | The uncoated tinplate base and its secondary cold-rolling method of a kind of high-strength high-elongation |
| CN115491594A (en) * | 2022-09-06 | 2022-12-20 | 武汉钢铁有限公司 | Method for producing ultrathin corrosion-resistant ultralow-carbon soft tin plate by adopting continuous annealing process |
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| CN1135940A (en) * | 1995-03-10 | 1996-11-20 | 川崎制铁株式会社 | Steel plate for tanks and manufacture thereof |
| CN1888113A (en) * | 2005-06-29 | 2007-01-03 | 宝山钢铁股份有限公司 | Soft tin-plate of hardness HR30T 51+/-3 and its making process |
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| JP3135656B2 (en) * | 1992-01-30 | 2001-02-19 | 新日本製鐵株式会社 | PROCESS FOR PRODUCING STEEL FOR FLEXIBLE NON-Aging Container with Temper T-3 or less |
| JPH05295427A (en) * | 1992-04-16 | 1993-11-09 | Nippon Steel Corp | Production of soft starting sheet for surface treatment by continuous annealing |
| JP3307715B2 (en) * | 1993-04-26 | 2002-07-24 | 新日本製鐵株式会社 | Surface treated original plate for DI can with excellent necked-in properties |
| JP3546605B2 (en) * | 1996-07-29 | 2004-07-28 | Ｊｆｅスチール株式会社 | Manufacturing method of steel sheet for cans |
| JP3740779B2 (en) * | 1997-03-12 | 2006-02-01 | Ｊｆｅスチール株式会社 | Steel plate for easy open can lid excellent in openability and rivet formability, manufacturing method thereof, and easy open can lid |
| JP2000054070A (en) * | 1998-08-05 | 2000-02-22 | Kawasaki Steel Corp | Steel sheet for can, excellent in surface roughing resistance and aging resistance, and its manufacture |
| JP2001247917A (en) * | 2000-03-06 | 2001-09-14 | Nkk Corp | Method for producing steel sheet containing extra-low carbon for can |
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|---|---|---|---|---|
| CN1135940A (en) * | 1995-03-10 | 1996-11-20 | 川崎制铁株式会社 | Steel plate for tanks and manufacture thereof |
| CN1888113A (en) * | 2005-06-29 | 2007-01-03 | 宝山钢铁股份有限公司 | Soft tin-plate of hardness HR30T 51+/-3 and its making process |
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| JP特开平5-295427A 1993.11.09 |
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| WO2008133175A1 (en) | 2008-11-06 |
| JPWO2008133175A1 (en) | 2010-07-22 |
| JP5099126B2 (en) | 2012-12-12 |
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