CN110506135A - Steel plate and its manufacturing method and bottle cap and DRD tank - Google Patents
Steel plate and its manufacturing method and bottle cap and DRD tank Download PDFInfo
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- CN110506135A CN110506135A CN201880021500.XA CN201880021500A CN110506135A CN 110506135 A CN110506135 A CN 110506135A CN 201880021500 A CN201880021500 A CN 201880021500A CN 110506135 A CN110506135 A CN 110506135A
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- Heat Treatment Of Steel (AREA)
Abstract
The present invention contains C in terms of quality % by being formed: more than 0.0060% and 0.0100% or less, Si:0.05% or less, 0.60% or less Mn:0.05% or more and, P:0.050% or less, S:0.050% or less, Al:0.020% or more and 0.050% or less and N:0.0070% or more and 0.0140% or less, surplus be Fe and inevitable impurity at be grouped as and 1/4 depth from plate thickness into the region of plate thickness central part with ferrite partial size standard deviation be 7.0 μm of ferritic phases below tissue, and make yield strength 560MPa or more, the steel plate for having sufficient intensity and excellent formability being thinning is provided.
Description
Technical field
The present invention relates to steel plate, particularly the high-strength steel sheet having excellent moldability and its manufacturing methods.As such
The typical case of steel plate, have as combination drawing process and re-drawing be process shape DRD (Drawing and Redrawing,
Drawing and re-drawing) tank and the lid as vial etc. bottle cap former material supply sheet metal.In addition, the present invention relates to
And bottle cap obtained from above-mentioned steel plate is formed and DRD tank.
Background technique
In the past, the container for beverages such as cold drink water, drinks used vial mostly.Especially for the glass of thin mouth
The made of metal lid of referred to as bottle cap is widely used in glass bottle.In general, bottle cap is using sheet metal as former material by stamping
It manufactures, is constituted by blocking the discshaped portion of bottleneck and being arranged in surrounding accordion-like portion, by fastening accordion-like portion
Bottle is sealed in bottleneck.
Use the content for filling the generation high internal pressure such as beer, soda in the bottle of bottle cap mostly.Therefore, bottle cap needs
High compressive resistance, so that internal pressure will not occur bottle cap deformation because of variation of temperature etc. and destroy bottle in raised situation
The case where sealing.In addition, even if the intensity of former material sufficiently, for bottle cap steel plate property uniform in material it is low in the case where,
Also can the shape comprising bottle cap it is irregular and deviate the bottle cap of product specification.Even if due to generating the bottle of such bad shape
The case where being fixed in bottleneck also and cannot get sufficient leakproofness is covered tightly, therefore, the steel plate of the former material as bottle cap also needs material equal
Even property is excellent.
The sheet metal of former material for bottle cap mainly uses SR (Single Reduced, primary to roll) steel plate.The steel plate
It is to implement to anneal and carry out obtained from skin pass rolling after making steel plate thinning using cold rolling.The plate thickness of previous bottle cap steel plate
Generally 0.22mm or more, the SR material by application using mild steel used in tank of food or beverage etc. as former material, can be true
Protect sufficient compressive resistance and formability.
In recent years, the requirement being thinning same as steel plate for tanks, for bottle cap steel plate, for the purpose of reducing cost
Increasing.When the plate thickness of bottle cap steel plate is less than 0.22mm, particularly is 0.20mm or less, previous is manufactured using SR material
Bottle cap for, compressive resistance becomes insufficient.In order to ensure the compressive resistance as bottle cap steel plate, need to make up with thin-walled
The strength reduction of change, apply be again carried out cold rolling after annealing and make its processing hardening DR (Double Reduced, it is secondary
Rolling) steel plate.
Bottle cap is at forming initial stage, and central portion is with to a certain degree by drawing, then, outer edge is shaped as pleat shape.Here,
When the former material of bottle cap is property uniform in material low steel plate, the bottle cap manufactured by the steel plate sometimes outer diameter and height become it is irregular and
Deviate product specification.When becoming bottle cap that is irregular and deviateing product specification there are outer diameter and height, there are a large amount of manufacture bottle caps
When yield rate reduce the problem of.In addition, there is a problem in that: bottle is covered in the bottle cap of outer diameter and highly deviated specification
It is easy to happen the leakage of content in transport after upper, the effect as lid can not be played.In addition, even if the outer diameter of bottle cap and
Height is in product specification, in the case where armor plate strength is low, it is also possible to bottle cap occur and fall off since compressive resistance is insufficient.
In addition, may result in when former material using the low steel plate of property uniform in material as DRD tank with the forming of DRD tank
When tank flange part generate fold be representative shape defect.For the DRD tank, exists due to shape defect and deviate production
When the DRD tank of product specification, also cause yield rate when largely manufacturing DRD tank reduce it is such with above-mentioned bottle cap the case where it is same
Problem.
About based on the high-strength steel sheet for bottle cap in terms of above-mentioned, one is disclosed in such as patent document 1
Kind of bottle cap steel plate and its manufacturing method, in the bottle cap steel plate, by contained in terms of quality % C:0.0010% or more and
0.0060% or less, Si:0.005% or more and 0.050% or less, Mn:0.10% or more and 0.50% or less, P:0.040%
Below, S:0.040% or less, Al:0.1000% or less, N:0.0100% hereinafter, and suitable control relative to rolling direction
It is thin even if thickness for the average value and yield strength of the r value of the minimum value and whole directions of the r value in 25~65 ° of directions
Meet sufficient bottle cap pressure resistance.
Existing technical literature
Patent document
Patent document 1: No. 6057023 bulletins of Japanese Patent No.
Summary of the invention
Problem to be solved by the invention
For the steel plate recorded in patent document 1, using the steel containing 0.0060% C below, make secondary cold-rolling
In interstand tension and annealing temperature be scheduled relationship, thus obtain being suitable for the r value (direction and size) of bottle cap processing.
This method does not control the hot-rolled process for influencing metal structure formation, and therefore, the fluctuation of the material of obtained steel plate becomes
Greatly, it is difficult to for practical.
The present invention is to complete in view of the above problems, and its purpose is to provide have sufficient intensity being thinning
With the steel plate and its manufacturing method of excellent formability.It is further an object that provide be adjusted to scheduled size and
The excellent bottle cap of the shape stability of shape and DRD tank.
The method for solving problem
Inventor has made intensive studies to for solution to the problems described above, as a result, it has been found that, by it is scheduled at
Be grouped as it is lower tissue is limited, high-intensitive and excellent formability can be assigned.The present invention is based on the opinion, purport structures
At as described below.
(1) a kind of steel plate has and contains C in terms of quality %: more than 0.0060% and 0.0100% or less, Si:
0.05% or less, Mn:0.05% or more and 0.60% or less, P:0.050% or less, S:0.050% or less, Al:0.020% with
Upper and 0.050% or less and N:0.0070% or more and 0.0140% or less, surplus are the ingredient of Fe and inevitable impurity
Composition,
There is ferritic phase into the region of plate thickness central part in 1/4 depth from plate thickness, the iron in the ferritic phase
The standard deviation of ferritic partial size be 7.0 μm hereinafter,
Yield strength is 560MPa or more.
(2) steel plate as described in above-mentioned (1), plate thickness are 0.20mm or less.
(3) a kind of bottle cap, the steel plate described in above-mentioned (1) or (2) are constituted.
(4) a kind of DRD tank, the steel plate described in above-mentioned (1) or (2) are constituted.
(5) a kind of manufacturing method of steel plate is the manufacturing method of steel plate described in above-mentioned (1) or (2), comprising:
Hot-rolled process heats steel former material at 1200 DEG C or more, is 870 DEG C or more and final rack in final rolling temperature
Reduction ratio be 10% or more under conditions of implement rolling, batched within the temperature range of 550~750 DEG C；
Pickling process carries out pickling to the hot rolled plate after above-mentioned hot rolling；
Once cold rolling process carries out the cold rolling that reduction ratio is 88% or more to the hot rolled plate after above-mentioned pickling；
Annealing operation, the cold-reduced sheet after above-mentioned once cold rolling is kept within the temperature range of 660~760 DEG C 60 seconds with
Under, 450 DEG C of temperature ranges below are then cooled to the average cooling rate of 10 DEG C/s or more, then with 5 DEG C/s's or more
Average cooling rate is cooled to 140 DEG C of temperature ranges below；With
Secondary cold-rolling process carries out cold rolling to above-mentioned annealed sheet with 10% or more and 40% reduction ratio below.
Invention effect
In accordance with the invention it is possible to provide being thinning with sufficient intensity and the excellent steel plate of property uniform in material
And its advantageous manufacturing method.In addition, by steel plate of the invention for such as bottle cap purposes or DRD tank purposes,
Bottle cap or DRD tank of the shape without deformation can be shaped.
Specific embodiment
Steel plate of the invention, which has, contains C in terms of quality %: more than 0.0060% and 0.0100% or less, Si:0.05%
Below, Mn:0.05% or more and 0.60% or less, P:0.050% or less, S:0.050% or less, Al:0.020% or more and
0.050% or less, N:0.0070% or more and 0.0140% or less, surplus be made of Fe and inevitable impurity at grouping
At there is ferritic phase into the region of plate thickness central part in 1/4 depth from plate thickness, the ferrite grain in the ferritic phase
The standard deviation of diameter is 7.0 μm or less.
Firstly, being successively illustrated since the restriction reason at each component amount in being grouped as of steel plate.It needs to illustrate
, " % " about ingredient is stated then indicates " quality % " unless otherwise specified.
C: more than 0.0060% and 0.0100% or less
When the content of C is 0.0060% or less, the ferrite of the steel plate after aftermentioned secondary cold-rolling is become thick, formability
It is deteriorated, for such as bottle cap purposes, bottle cap outer diameter and the bottle cap height shaped becomes uneven.Similarly,
For such as DRD tank purposes, become the tank of shape defect in flange part generation fold in DRD can shaping.
On the other hand, when C content is more than 0.0100%, the ferrite of the steel plate after secondary cold-rolling becomes excessively fine, armor plate strength mistake
Degree increases, formability deterioration, and for such as bottle cap purposes, the outer diameter and height of the bottle cap shaped become uneven
It is even.Similarly, for such as DRD tank purposes, fold is generated in flange part in DRD can shaping and becomes shape
Undesirable tank.Therefore, the content of C is set as more than 0.0060% and 0.0100% or less.It is preferred that the content of C is set as
0.0065% or more and 0.0090% or less.
Si:0.05% or less
When containing a large amount of Si, based on the reason same as C, for such as bottle cap purposes, the outer diameter of bottle cap
It is impaired with the uniformity of height, for such as DRD tank purposes, cause to generate in DRD can shaping in flange part
The shape defect of fold.Therefore, the content of Si is set as 0.05% or less.In addition, reducing Si excessively will lead to steel-making cost
Increase, therefore, the content of Si is preferably set to 0.004% or more.More preferably 0.01% or more and 0.03% or less.
0.60% or less Mn:0.05% or more and
When the content of Mn is lower than 0.05%, even if the content for reducing S is also difficult to avoid that thermal embrittlement, generated in continuously casting
The problems such as skin breakage.Therefore, the content of Mn is set as 0.05% or more.When on the other hand, containing a large amount of Mn, based on same with C
The reasons why sample, for such as bottle cap purposes, the outer diameter of bottle cap and the uniformity of height are impaired, for for example
In the case where DRD tank purposes, cause to generate the shape defect of fold in flange part in DRD can shaping.Therefore, the content of Mn is set
It is set to 0.60% or less.It is preferred that the content of Mn is 0.10% or more and 0.50% or less.
P:0.050% or less
When the content of P is more than 0.050%, cause the reduction of the hardening, corrosion resistance of steel plate.In addition, the iron after annealing
The standard deviation of ferritic partial size becomes larger than 7.0 μm, and formability is deteriorated, for such as bottle cap purposes, bottle cap
The uniformity of outer diameter and height is impaired, for such as DRD tank purposes, causes in DRD can shaping in flange part
Generate the shape defect of fold.Therefore, the upper limit value of the content of P is set as 0.050%.In addition, in order to make P lower than 0.001%,
De- P cost becomes excessive, and therefore, the content of P is preferably set to 0.001% or more.
S:0.050% or less
S forms MnS in conjunction with Mn in steel plate, reduces the high-temperature ductility of steel plate when being largely precipitated.The content of S is more than
When 0.050%, which becomes significant.Therefore, the upper limit value of the content of S is set as 0.050%.In addition, in order to be lower than S
0.005%, de- S cost becomes excessive, and therefore, the content of S is preferably set to 0.004% or more.
0.050% or less Al:0.020% or more and
Al is the element contained as deoxidier, and forms AlN with the N in steel, reduces the solid solution N in steel.Al contains
When amount is lower than 0.020%, the effect as deoxidier is become inadequate, and leads to the generation of coagulation defect, and make steel-making cost
Increase.In addition, when Al amount is lower than 0.020%, when ferritic recrystallization in annealing, is unable to ensure the AlN of appropriate amount, because
This, the standard deviation of the ferrite partial size after annealing becomes larger, and the ferrite of the steel plate after secondary cold-rolling becomes thick, and formability becomes
Difference.Then, for such as bottle cap purposes, the outer diameter of bottle cap and the uniformity of height are impaired, for such as DRD
In the case where tank purposes, cause to generate the shape defect of fold in flange part in DRD can shaping.On the other hand, the content of Al
When more than 0.050%, the formation of AlN increases, and the aftermentioned N amount for facilitating armor plate strength in the form of being dissolved N is reduced, and steel plate is strong
Degree reduces, and therefore, Al content is set as 0.050% or less.It is preferred that Al content is 0.030% or less and 0.045% or less.
0.0140% or less N:0.0070% or more and
When the content of N is lower than 0.0070%, the ferrite of the steel plate after secondary cold-rolling is become thick, and formability is deteriorated, In
In the case where such as bottle cap purposes, the outer diameter and height of the bottle cap shaped become uneven and aftermentioned to be dissolved N
Form facilitate armor plate strength N amount reduce, armor plate strength reduce.Similarly, for such as DRD tank purposes the case where
Under, become the tank of shape defect in flange part generation fold in DRD can shaping.On the other hand, N content is more than 0.0140%
When, the ferrite of the steel plate after secondary cold-rolling becomes excessively fine, and armor plate strength excessively increases, formability deterioration, for example
In the case where bottle cap purposes, the outer diameter of bottle cap and the uniformity of height are impaired, for such as DRD tank purposes,
Cause to generate the shape defect of fold in flange part in DRD can shaping.It is preferred that the content of N be set as 0.0085 or more and
0.0125% or less.More preferably it is set as more than 0.0100%.
Surplus other than above ingredient is set as Fe and inevitable impurity.
Then, the metal structure about steel plate of the invention, at least from 1/4 depth of plate thickness to plate thickness central part
Standard deviation with ferritic phase and the ferrite partial size in the ferritic phase in region is 7.0 μm or less and is important.
Firstly, the metal structure of steel plate of the invention, based on ferritic phase, surplus is cementite, ferritic phase is preferred
For 85 volume % or more.More preferably 90% or more.That is, being easy when ferritic phase is less than 85 volume % in processing with hard
Cementite be starting point be broken, formability deteriorate.
In above metal structure, at least from 1/4 depth of plate thickness into the ferritic phase in the region of plate thickness central part
Ferrite partial size standard deviation be 7.0 μm or less.
That is, formability is deteriorated, in the feelings for such as bottle cap purposes when the standard deviation of ferrite partial size is greater than 7.0 μm
Under condition, the outer diameter of the bottle cap shaped and height become uneven, and compressive resistance reduces, and yield rate drop when manufacturing bottle cap
It is low.Similarly, for such as DRD tank purposes, fold is generated in flange part in DRD can shaping and becomes shape
Undesirable tank.It is preferred that the standard deviation of ferrite partial size is 6.5 μm or less.
Here, being ground about ferritic metal structure to the section in the plate thickness direction parallel with steel plate rolling direction
After mill, corroded using corrosive liquid (3 volume % nital), using optical microscopy with 400 times of multiplying power 10
A visual field to from 1/4 depth location of plate thickness (it is in above-mentioned section, on plate thickness direction apart from surface be plate thickness 1/4 position)
It is observed to the region of 1/2 position of plate thickness, using the macrograph using optical microscopy shooting, determines to come by visual observation true
Determine ferrite, ferritic partial size is found out by image analysis.The size distribution of ferrite partial size is found out in each visual field, is calculated
Standard deviation is averaged to the standard deviation in 10 visuals field, using resulting value as the standard deviation of ferrite partial size.Image point
Analysis uses the image analysis software " Stream Essentials " of Olympus Co., Ltd.
Desired metal structure can by adjusting at be grouped as, adjust heating temperature in hot-rolled process, final rolling temperature,
The reduction ratio and coiling temperature of final rack, the reduction ratio for adjusting once cold rolling, the cooling velocity in adjustment continuous annealing process,
The reduction ratio in secondary cold-rolling process is adjusted to obtain.It should be noted that the details of manufacturing condition is as described later.
For have it is above at the steel plate for being grouped as and organizing for, even such as 0.20mm plate thickness below,
It can ensure high-intensitive, specifically 560MPa or more yield strength.
That is, steel plate of the invention is required to be anchored on the bottle cap of bottleneck for such as bottle cap not due to internal pressure
Compressive resistance for the purpose of falling off.The plate thickness of the bottle cap used in the past steel plate is 0.22mm or more, makes plate thickness 0.20mm
Below, particularly 0.18mm is below when being thinning, and needs than previous high intensity.The yield strength of steel plate is lower than 560MPa
When, sufficient compressive resistance can not be assigned to the bottle cap being thinning as described above.Therefore, yield strength need for 560MPa with
On.In order to ensure more fully compressive resistance, yield strength are preferably 600MPa or more.When yield strength is excessively high, bottle cap at
Bottle cap height reduces when shape, and bottle cap shape becomes unevenly, and therefore, the yield strength of rolling direction is preferably 700MPa or less.
More preferably 600MPa or more and 680MPa or less.
It should be noted that yield strength can pass through Tensile Testing Method of Metallic Materials shown in " JIS Z 2241 "
To measure.
Then, the manufacturing method of steel plate of the invention is illustrated.
Steel plate of the invention is manufactured by following process: steel former material (steel billet) In constituted will be made of mentioned component
1200 DEG C or more are heated, and final rolling temperature is 870 DEG C or more, the reduction ratio of final rack are set as 10% or more, 550
The hot-rolled process batched within the temperature range of~750 DEG C；The pickling process of pickling is carried out after above-mentioned hot rolling；In above-mentioned pickling work
The once cold rolling process of cold rolling is carried out after sequence with 88% or more reduction ratio；It is 660 by soaking temperature after above-mentioned once cold rolling
Retention time within the temperature range of~760 DEG C is set as 60 seconds hereinafter, being cooled to the average cooling rate of 10 DEG C/s or more
450 DEG C of temperature ranges below are cooled to the continuous of 140 DEG C of temperature ranges below with the average cooling rate of 5 DEG C/s or more
Annealing operation；Secondary cold-rolling is carried out with 10% or more and 40% reduction ratio below.
It should be noted that in the following description, the regulation of temperature is using the surface temperature of steel plate as benchmark.In addition,
Average cooling rate is set as value obtained from being calculated based on surface temperature.For example, below from soaking temperature to 450 DEG C
The average cooling rate of temperature range is by ((soaking temperature-(450 DEG C of temperature ranges below))/from soaking temperature to (450 DEG C
Temperature range below) cooling time) indicate.It should be noted that " the 450 DEG C of temperature ranges below " in above formula is
Refer to the cooling stopping temperature being located in the temperature range.
When manufacturing steel plate of the invention, by using the known method of converter etc., by molten steel be adjusted to above-mentioned chemistry at
Point, then, steel billet is made for example, by continuous casting process, as steel former material.
(steel former material heating temperature: 1200 DEG C or more)
The heating temperature of the steel former material of hot-rolled process is set as 1200 DEG C or more.When the heating temperature is lower than 1200 DEG C, this
In order to ensure the reduction of solid solution N amount needed for intensity, strength reduction in invention, therefore it is set as 1200 DEG C or more.It needs to illustrate
It is, it is believed that N mainly exists in the form of AlN in steel in steel composition of the invention, therefore, will subtract from the total amount of N (Ntotal)
(Ntotal- (NasAlN)) obtained from N amount (NasAlN) existing for going in the form of AlN is considered as solid solution N amount.In order to make steel plate
Rolling direction yield strength be 560MPa or more, solid solution N amount preferably 0.0071% or more, can be by the way that steel former material be added
Hot temperature is set as 1200 DEG C or more to ensure.Preferred solid solution N amount is 0.0090% or more, for this purpose, it is preferred that by steel former material
Heating temperature is set as 1220 DEG C or more.Even more than 1300 DEG C, effect is also saturated steel former material heating temperature, therefore preferably
1300 DEG C or less.
(final rolling temperature: 870 DEG C or more)
The final rolling temperature of hot-rolled process be lower than 870 DEG C when, ferritic a part of steel plate attenuate it is small, ferrite partial size
Standard deviation becomes larger than 7.0 μm, and formability is deteriorated.Then, for such as bottle cap purposes, bottle cap shape becomes
Unevenly, for such as DRD tank purposes, cause to generate the shape of fold not in flange part in DRD can shaping
It is good.Therefore, final rolling temperature is set as 870 DEG C or more.On the other hand, final rolling temperature is improved to more than necessity making Bao Gang sometimes
The manufacture of plate becomes difficult.Specifically, final rolling temperature is preferably set within the scope of 870 DEG C or more and 950 DEG C or less of temperature.
(the reduction ratio of final rack: 10% or more)
The reduction ratio of the final rack of hot-rolled process is set as 10% or more.When the reduction ratio of final rack is less than 10%,
Ferritic a part of coarsening of steel plate, ferritic standard deviation become larger than 7.0 μm, and formability is deteriorated.Then, it is supplying
In the case where such as bottle cap purposes, bottle cap shape becomes unevenly, for such as DRD tank purposes, to cause
The shape defect of fold is generated when DRD can shaping in flange part.Therefore, the reduction ratio of final rack is set as 10% or more.For
Reduce the standard deviation of ferrite partial size, the reduction ratio of final rack is preferably set to 12% or more.From the sight of rolling loads
Point considers that the upper limit of the reduction ratio of final rack is preferably set to 15% or less.
(coiling temperature: 550~750 DEG C)
The coiling temperature of hot-rolled process be lower than 550 DEG C when, ferritic a part of steel plate attenuate it is small, ferrite partial size
Standard deviation becomes larger than 7.0 μm, and formability is deteriorated.Then, for such as bottle cap purposes, bottle cap shape becomes
Unevenly, for such as DRD tank purposes, cause to generate the shape of fold not in flange part in DRD can shaping
It is good.Therefore, coiling temperature is set as 550 DEG C or more.On the other hand, when coiling temperature is higher than 750 DEG C, ferritic the one of steel plate
Part coarsening, ferritic standard deviation become larger than 7.0 μm, for such as bottle cap purposes, bottle cap shape
Become uneven, for such as DRD tank purposes, causes to generate the shape of fold in flange part in DRD can shaping
Shape is bad.Therefore, coiling temperature is set as 750 DEG C or less.Preferably 600 DEG C or more and 700 DEG C or less.
(pickling)
Then, pickling is preferably carried out.As long as pickling can remove superficial oxidation skin, do not need to carry out condition special
It does not limit.
Then, cold rolling, which is divided into, clips carrying out twice for annealing.
(once cold rolling reduction ratio: 88% or more)
Firstly, the reduction ratio of once cold rolling process is set as 88% or more.The reduction ratio of once cold rolling process is less than 88%
When, the strain that steel plate assigns is reduced in cold rolling, therefore, the recrystallization in continuous annealing process becomes unevenly, ferritic
Standard deviation becomes larger than 7.0 μm, and formability is deteriorated.Then, for such as bottle cap purposes, bottle cap shape becomes
Unevenly, for such as DRD tank purposes, cause to generate the shape of fold not in flange part in DRD can shaping
It is good.Therefore, the reduction ratio of once cold rolling process is set as 88% or more.More preferably it is set as 89~94%.
In annealing operation after once cold rolling, kept for 60 seconds within the temperature range of 660~760 DEG C hereinafter, then, carrying out
The leading portion for being cooled to 450 DEG C of temperature ranges below with the average cooling rate of 10 DEG C/s or more is cooling and then with 5 DEG C/s
The back segment that above average cooling rate is cooled to 140 DEG C of temperature ranges below is cooling.
(soaking temperature: 660~760 DEG C)
That is, soaking temperature in continuous annealing process be 660~760 DEG C at a temperature of carry out.Soaking temperature is more than 760
DEG C when, the logical plate failure such as hot wooden dipper song is easy to happen in continuous annealing, thus not preferably.In addition, the ferrite partial size one of steel plate
Part coarsening, ferritic standard deviation become larger than 7.0 μm, for such as bottle cap purposes, bottle cap shape
Become uneven, for such as DRD tank purposes, causes to generate the shape of fold in flange part in DRD can shaping
Shape is bad.On the other hand, when annealing temperature is lower than 660 DEG C, recrystallization becomes not exclusively, and ferrite partial size a part of steel plate becomes
Tiny, the standard deviation of ferrite partial size becomes larger than 7.0 μm, and for such as bottle cap purposes, bottle cap shape becomes
It obtains unevenly, for such as DRD tank purposes, causes to generate the shape of fold in flange part in DRD can shaping
It is bad.Therefore, it is set as carrying out at a temperature of soaking temperature is 660~760 DEG C.It is preferred that 680~730 DEG C at a temperature of into
Row.
Retention time within the temperature range of soaking temperature is 660~760 DEG C is set as 60 seconds or less.Retention time is more than
At 60 seconds, the C contained in steel plate is segregated to ferrite grain boundaries, with the shape of carbide in the cooling procedure in continuous annealing process
Formula is precipitated, and the solid solution C amount for facilitating armor plate strength is reduced, and yield strength reduces.In addition, steel plate is used for such as DRD tank
In the case where way, cause to generate the shape defect of fold in flange part in DRD can shaping.Therefore, soaking temperature be 660~
Retention time within the temperature range of 760 DEG C is set as 60 seconds or less.It should be noted that when the retention time is less than 5 seconds, steel plate
Stability when carrying out logical plate from the roller of soaking zone is impaired, it is therefore preferable that will be set as 5 seconds or more the retention time.
(leading portion is cooling: being cooled to 450 DEG C or less with the average cooling rate of 10 DEG C/s or more)
After above-mentioned soaking, 450 DEG C of temperature ranges below are cooled to the average cooling rate of 10 DEG C/s or more.It is average cold
But when speed is less than 10 DEG C/s, Carbide Precipitation is promoted in cooling, and the solid solution C amount for facilitating armor plate strength is reduced, surrender
Strength reduction.In addition, causing to generate in DRD can shaping in flange part by steel plate for such as DRD tank purposes
The shape defect of fold.It should be noted that above-mentioned effect saturation is therefore, average when average cooling rate is more than 50 DEG C/s
Cooling velocity is preferably set to 50 DEG C/s or less.
In addition, cooling during leading portion after soaking is cooling stops temperature when being more than 450 DEG C, the carbide analysis after leading portion is cooling
It is promoted out, the solid solution C amount for facilitating armor plate strength is reduced, and yield strength reduces.In addition, by steel plate for such as DRD tank
In the case where purposes, cause to generate the shape defect of fold in flange part in DRD can shaping.It should be noted that after soaking
Leading portion it is cooling in it is cooling when stopping temperature and being lower than 300 DEG C, Carbide Precipitation inhibitory effect saturation moreover, is led to
Plate profile deterioration when plate, steel plate can not be cooled down equably, and for such as bottle cap purposes, bottle cap shape becomes
Unevenly, in addition, for such as DRD tank purposes, cause to generate the shape of fold in flange part in DRD can shaping
Shape is bad, and therefore, the cooling temperature that stops after soaking is preferably set to 300 DEG C or more.
(back segment is cooling: with the average cooling rate of 5 DEG C/s or more to 140 DEG C or less)
During leading portion back segment after cooling is cooling, stopped with the average cooling rate of 5 DEG C/s or more from cooling of leading portion when cooling
Only temperature is cooled to 140 DEG C of temperature ranges below.When average cooling rate is less than 5 DEG C/s, facilitate the solid solution C of armor plate strength
Amount is reduced, and yield strength reduces.In addition, causing by steel plate for such as DRD tank purposes in DRD can shaping
The shape defect of fold is generated in flange part.It should be noted that not only effect is full when average cooling rate is more than 30 DEG C/s
With, and cooling equipment generates excessive cost, and therefore, the average cooling rate in back segment cooling is preferably 30 DEG C/s or less.
More preferably 25 DEG C/s or less.
During back segment is cooling, it is cooled to 140 DEG C or less.When more than 140 DEG C, the solid solution C amount for facilitating armor plate strength is reduced, and is bent
Take strength reduction.In addition, causing to produce in DRD can shaping in flange part by steel plate for such as DRD tank purposes
The shape defect of raw fold.It should be noted that not only effect is saturated, but also cooling is set when cooling stopping temperature being lower than 100 DEG C
It is standby to generate excessive cost, it is therefore preferable that being 100 DEG C or more.More preferably 120 DEG C or more.
(secondary cold-rolling reduction ratio: 10% or more and 40% or less)
Steel plate of the invention can obtain high-yield strength by second of cold rolling after annealing.That is, secondary cold-rolling
When reduction ratio is less than 10%, it cannot get sufficient yield strength.In addition, when the reduction ratio of secondary cold-rolling is more than 40%, for example
By steel plate for bottle cap purposes in the case where, damage bottle cap shape uniformity.In addition, in the feelings for such as DRD tank purposes
Under condition, cause to generate the shape defect of fold in flange part in DRD can shaping.Therefore, the reduction ratio of secondary cold-rolling is preferably set
It is set to 10% or more and 40% or less.The reduction ratio of more preferable secondary cold-rolling is more than 15% and is 35% or less.
For the cold-rolled steel sheet obtained in the above described manner, it is then possible to as desired by such as plating to surface of steel plate
Implement the platings such as tin plating, chromium plating, nickel plating and form coating, is made after coated steel sheet for using.It should be noted that by
Sufficiently small relative to plate thickness in the film thickness of the surface treatments such as plating, therefore, the influence to the mechanical property of steel plate is can to ignore
Level.
As discussed above, steel plate of the invention can have sufficient intensity and excellent being thinning
Property uniform in material.Therefore, the former material of steel plate of the invention most suitable as especially bottle cap or DRD tank.
In addition, bottle cap of the invention is shaped using above-mentioned steel plate.Bottle cap is mainly by blocking the discoid of bottleneck
Part and setting are constituted in surrounding accordion-like portion.Bottle cap of the invention can be by steelplate punching of the invention at circular base
It is formed after material by stamping.Bottle cap of the invention has sufficient yield strength, and excellent by property uniform in material
Good steel plate manufacture, therefore, even if being thinning, the compressive resistance as bottle cap is also excellent, and the outer diameter of bottle cap and height
Excellent in uniform, therefore, the yield rate in bottle cap manufacturing process improve, and have the waste for reducing and manufacturing and generating with bottle cap
Discharge amount effect.
Similarly, DRD tank of the invention is shaped using above-mentioned steel plate.DRD tank can be by will be of the invention
Steelplate punching is shaped at drawing process and re-drawing processing is implemented after circular blank.Using steel plate of the invention as former material
The shape of DRD tank is uniform, does not deviate by product specification, and therefore, the yield rate in DRD tank manufacturing process improves, and also has and reduces
The effect of the discharge amount of the waste generated with the manufacture of DRD tank.
Embodiment 1
By containing shown in table 1 at be grouped as, steel that surplus is made of Fe and inevitable impurity utilizes converter to carry out
Melting carries out continuously casting, thus obtains steel billet.For the steel billet obtained herein, implement billet heating temperature shown in table 2,
Hot rolling under final rolling temperature, coiling temperature.Pickling is carried out after the hot rolling.Then, it is carried out with reduction ratio shown in table 2 primary cold
It rolls, the continuous annealing shown in table 2 under the conditions of carries out continuous annealing, then implements secondary cold-rolling with reduction ratio shown in table 2.It is right
Obtained steel plate is continuously implemented to be electrolysed chromic acid processing, obtains tin-free steel.
[table 1] (quality %)
| Steel No. | C | Si | Mn | P | S | AI | N | Remarks |
| 1 | 0.0072 | 0.01 | 0.16 | 0.018 | 0.006 | 0.036 | 0.0103 | Example |
| 2 | 0.0098 | 0.01 | 0.14 | 0.019 | 0.010 | 0.044 | 0.0117 | Example |
| 3 | 0.0061 | 0.02 | 0.15 | 0.018 | 0.009 | 0.038 | 0.0102 | Example |
| 4 | 0.0089 | 0.02 | 0.13 | 0.026 | 0.026 | 0.031 | 0.0096 | Example |
| 5 | 0.0065 | 0.02 | 0.12 | 0.031 | 0.017 | 0.040 | 0.0104 | Example |
| 6 | 0.0083 | 0.04 | 0.26 | 0.015 | 0.013 | 0.047 | 0.0129 | Example |
| 7 | 0.0064 | 0.01 | 0.58 | 0.019 | 0.011 | 0.028 | 0.0083 | Example |
| 8 | 0.0093 | 0.01 | 0.06 | 0.017 | 0.015 | 0.025 | 0.0135 | Example |
| 9 | 0.0067 | 0.03 | 0.48 | 0.022 | 0.030 | 0.041 | 0.0108 | Example |
| 10 | 0.0080 | 0.02 | 0.11 | 0.018 | 0.027 | 0.036 | 0.0116 | Example |
| 11 | 0.0063 | 0.03 | 0.16 | 0.034 | 0.009 | 0.046 | 0.0078 | Example |
| 12 | 0.0086 | 0.02 | 0.53 | 0.008 | 0.028 | 0.032 | 0.0103 | Example |
| 13 | 0.0064 | 0.03 | 0.27 | 0.019 | 0.046 | 0.029 | 0.0075 | Example |
| 14 | 0.0075 | 0.01 | 0.38 | 0.021 | 0.004 | 0.043 | 0.0118 | Example |
| 15 | 0.0091 | 0.01 | 0.42 | 0.016 | 0.016 | 0.049 | 0.0134 | Example |
| 16 | 0.0062 | 0.02 | 0.25 | 0.023 | 0.042 | 0.020 | 0.0081 | Example |
| 17 | 0.0079 | 0.01 | 0.36 | 0.024 | 0.009 | 0.045 | 0.0124 | Example |
| 18 | 0.0081 | 0.02 | 0.44 | 0.012 | 0.023 | 0.030 | 0.0087 | Example |
| 19 | 0.0064 | 0.02 | 0.13 | 0.031 | 0.033 | 0.046 | 0.0139 | Example |
| 20 | 0.0095 | 0.02 | 0.22 | 0.011 | 0.036 | 0.023 | 0.0072 | Example |
| 21 | 0.0084 | 0.03 | 0.35 | 0.016 | 0.018 | 0.044 | 0.0125 | Example |
| 22 | 0.0087 | 0.03 | 0.17 | 0.027 | 0.024 | 0.038 | 0.0085 | Example |
| 23 | 0.0106 | 0.02 | 0.20 | 0.018 | 0.009 | 0.036 | 0.0107 | Comparative example |
| 24 | 0.0118 | 0.01 | 0.17 | 0.011 | 0.010 | 0.030 | 0.0105 | Comparative example |
| 25 | 0.0141 | 0.01 | 0.19 | 0.015 | 0.008 | 0.037 | 0.0109 | Comparative example |
| 26 | 0.0052 | 0.02 | 0.22 | 0.019 | 0.007 | 0.041 | 0.0106 | Comparative example |
| 27 | 0.0045 | 0.02 | 0.16 | 0.017 | 0.009 | 0.032 | 0.0104 | Comparative example |
| 28 | 0.0034 | 0.02 | 0.14 | 0.012 | 0.010 | 0.042 | 0.0108 | Comparative example |
| 29 | 0.0078 | 0.01 | 0.78 | 0.025 | 0.039 | 0.039 | 0.0076 | Comparative example |
| 30 | 0.0065 | 0.03 | 0.33 | 0.013 | 0.025 | 0.083 | 0.0132 | Comparative example |
| 31 | 0.0072 | 0.03 | 0.14 | 0.027 | 0.014 | 0.007 | 0.0107 | Comparative example |
| 32 | 0.0085 | 0.01 | 0.16 | 0.014 | 0.009 | 0.033 | 0.0181 | Comparative example |
| 33 | 0.0081 | 0.02 | 0.22 | 0.010 | 0.007 | 0.038 | 0.0168 | Comparative example |
| 34 | 0.0077 | 0.02 | 0.21 | 0.019 | 0.008 | 0.042 | 0.0156 | Comparative example |
| 35 | 0.0083 | 0.01 | 0.15 | 0.013 | 0.010 | 0.035 | 0.0066 | Comparative example |
| 36 | 0.0079 | 0.01 | 0.17 | 0.020 | 0.008 | 0.044 | 0.0052 | Comparative example |
| 37 | 0.0084 | 0.01 | 0.19 | 0.014 | 0.005 | 0.036 | 0.0044 | Comparative example |
| 38 | 0.0092 | 0.02 | 0.21 | 0.068 | 0.009 | 0.038 | 0.0105 | Comparative example |
| 39 | 0.0075 | 0.96 | 0.19 | 0.022 | 0.011 | 0.042 | 0.0118 | Comparative example |
Note) underscore portion: outside the scope of the invention
For the steel plate obtained by above step, 210 DEG C and 15 minutes of the heat treatment for being equivalent to coating sintering is carried out,
Then tension test is carried out.In tension test, using the tension test sheet of JIS5 size, carried out according to " JIS Z 2241 ",
Measure the yield strength of rolling direction.It should be noted that this be equivalent to coating sintering heat treatment for the heat treatment before
Steel plate material will not generate any influence.
Using obtained steel plate, it is configured to bottle cap, bottle cap formability is evaluated.That is, the use of diameter being 37mm's
Circular blank goes out each 20 (N=20) bottle caps for each steel formability by punch process.The height of bottle cap is (from bottle cap top surface
To the distance of skirt lower end) it is measured using micrometer, it is that 0.09mm or less is set by the standard deviation of the bottle cap height of N=20
It is excellent for bottle cap shape, the standard deviation of the bottle cap height of N=20 is greater than 0.09mm and is set as bottle cap shape difference.It will be acquired
Result be shown in Table 2.
In turn, using obtained steel plate, carry out the heat treatment for being equivalent to coating sintering of 210 DEG C, 15 minutes, then at
Shape is DRD tank, is evaluated DRD can shaping.That is, the circular blank for the use of diameter being 158mm, implements drawing process and again
Drawing process shapes the DRD tank of internal diameter 82.8mm, flange diameter 102mm, evaluates DRD can shaping.It, will in evaluation
By visual observation flange part see micro- crenulate sample more than at 3 be set as ×, by the fine fold of flange part be 2 at
Under sample be set as zero.It should be evaluation result is shown in table in 2.
As shown in Table 2, for the steel plate as No.1~22 of example of the present invention, the yield strength of rolling direction is
560MPa or more, and the standard deviation of bottle cap height is 0.09mm hereinafter, bottle cap formability is good.In addition, in DRD can shaping
Fold generation number be 2 at hereinafter, DRD can shaping is also good.
On the other hand it is found that for the steel plate as No.23~25 of comparative example, since the content of C is excessive, because
This, the standard deviation of ferrite partial size is greater than 7.0 μm, and the standard deviation of bottle cap height is greater than 0.09mm, and bottle cap formability deteriorates,
And DRD can shaping also deteriorates.It knows for the steel plate of No.26~28, since the content of C is very few, ferrite
The standard deviation of partial size is greater than 7.0 μm, and the standard deviation of bottle cap height is greater than 0.09mm, the deterioration of bottle cap formability.Known to for
For the steel plate of No.29, since the content of Mn is excessive, the standard deviation of ferrite partial size is greater than 7.0 μm, bottle cap height
Standard deviation be greater than 0.09mm, the deterioration of bottle cap formability, and DRD can shaping also deteriorates.Know the steel plate for No.30
For, since the content of Al is excessive, the formation of AlN increases, and the N amount for facilitating armor plate strength in the form of being dissolved N subtracts
Few, armor plate strength reduces.In addition, DRD can shaping also deteriorates.For the steel plate of No.31, since the content of Al is very few,
Therefore, insufficient as the effect of deoxidier, lead to the generation of coagulation defect, and steel-making cost increases.In addition we know, due to
The AlN of appropriate amount, therefore, the standard deviation of the ferrite partial size after annealing are unable to ensure when ferritic recrystallization in annealing
Difference becomes larger, and the ferrite partial size of the steel plate after secondary cold-rolling becomes thick, and the standard deviation of ferrite partial size is greater than 7.0 μm, bottle
The standard deviation of lid height is greater than 0.09mm, the deterioration of bottle cap formability, and DRD can shaping also deteriorates.It knows for No.32
For~34 steel plate, since the content of N is excessive, the ferrite partial size of the steel plate after secondary cold-rolling becomes fine, iron element
The standard deviation of body partial size is greater than 7.0 μm, and the standard deviation of bottle cap height is greater than 0.09mm, the deterioration of bottle cap formability, and DRD
Can shaping also deteriorates.It knows for the steel plate of No.35~37, since the content of N is very few, the ferrite of steel plate
Partial size becomes thick, and the standard deviation of ferrite partial size is greater than 7.0 μm, and the standard deviation of bottle cap height is greater than 0.09mm, bottle cap
Formability deterioration, and DRD can shaping also deteriorates, while facilitating the N amount reduction of armor plate strength, steel in the form of being dissolved N
Plate strength reduction.In addition we know, for the steel plate of No.38, since the content of P is excessive, the standard of ferrite partial size
Deviation is greater than 7.0 μm, and the standard deviation of bottle cap height is greater than 0.09mm, the deterioration of bottle cap formability, and DRD can shaping is also bad
Change.It knows for the steel plate of No.39, since the content of Si is excessive, the standard deviation of ferrite partial size is greater than 7.0 μ
M, the standard deviation of bottle cap height is greater than 0.09mm, the deterioration of bottle cap formability, and DRD can shaping also deteriorates.
Embodiment 2
By containing steel No.5,9,18,21,28,29,31 shown in table 1 at be grouped as, surplus is by Fe and inevitably
The steel that impurity is constituted carries out melting using converter, carries out continuously casting, thus obtains steel billet.It is real for the steel billet obtained herein
Apply the hot rolling under billet heating temperature shown in table 3, final rolling temperature, coiling temperature.Pickling is carried out after hot rolling.Then, with table 3
Shown in reduction ratio carry out once cold rolling, the soaking shown in table 3 keeps temperature, soaking retention time, the cooling average speed of leading portion
The cooling stopping temperature of degree, leading portion, the cooling average speed of back segment, back segment cooling carry out continuous annealing at a temperature of stopping, then with table 3
Shown in reduction ratio implement secondary cold-rolling.Obtained steel plate is continuously implemented to be electrolysed chromic acid processing, obtains tin-free steel.
For the steel plate obtained by above step, by carrying out tension test with aforementioned same method, and carry out
The evaluation of bottle cap formability and DRD can shaping.The results obtained are shown in table 3.
According to table 3, for as example of the present invention steel plate No.40,43,45,47,48,52~55,58,59,63,64,
66, for 69,70,71 steel plate, the yield strength of rolling direction is up to 560MPa or more, and the standard deviation of bottle cap height
For 0.09mm hereinafter, bottle cap formability, DRD can shaping are good.
On the other hand, it is known that for the steel plate as steel plate No.41,49,50,56,61,68,72 of comparative example, by
In billet heating temperature, the soaking retention time, the cooling average speed of leading portion, secondary cold reduction ratio, the cooling average speed of back segment, preceding
Section is cooling to stop the cooling stopping temperature departure scope of the invention of temperature, back segment, and therefore, the yield strength of rolling direction reduces.It can
Know for the steel plate as the steel plate No.62 of comparative example, since secondary cold reduction ratio is excessively high, steel plate it is each to different
Property increase, the standard deviation of bottle cap height is greater than 0.09mm, the deterioration of bottle cap formability, and DRD can shaping also deteriorates.Known to
For the steel plate as steel plate No.42,44,46,51,57,60,65,67,73,74 of comparative example, due to heating steel billet temperature
Degree, the final rack reduction ratio of hot rolling, coiling temperature, once cold rolling rate, soaking keep temperature, leading portion it is cooling stop temperature, after
Section cools down average speed, back segment cooling stops temperature, a certain item in secondary cold reduction ratio is outside the scope of the present invention, and therefore, rolls
The yield strength in direction processed reduces or the standard deviation of ferrite partial size is greater than 7.0 μm, and the standard deviation of bottle cap height is greater than
0.09mm, the deterioration of bottle cap formability, and DRD can shaping also deteriorates.
Claims (5)
1. a kind of steel plate, have and contain C in terms of quality %: more than 0.0060% and 0.0100% or less, Si:0.05% with
Under, Mn:0.05% or more and 0.60% or less, P:0.050% or less, S:0.050% or less, Al:0.020% or more and
0.050% or less and N:0.0070% or more and 0.0140% or less, surplus be Fe and inevitable impurity at being grouped as,
There is ferritic phase into the region of plate thickness central part in 1/4 depth from plate thickness, the ferrite in the ferritic phase
The standard deviation of partial size be 7.0 μm hereinafter,
Yield strength is 560MPa or more.
2. steel plate as described in claim 1, plate thickness is 0.20mm or less.
3. a kind of bottle cap is made of steel plate of any of claims 1 or 2.
4. a kind of DRD tank, is made of steel plate of any of claims 1 or 2.
5. a kind of manufacturing method of steel plate is the manufacturing method of steel plate of any of claims 1 or 2, comprising:
Hot-rolled process heats steel former material at 1200 DEG C or more, in the pressure that final rolling temperature is 870 DEG C or more and final rack
Lower rate implements rolling under conditions of being 10% or more, batches within the temperature range of 550~750 DEG C；
Pickling process carries out pickling to the hot rolled plate after the hot rolling；
Once cold rolling process carries out the cold rolling that reduction ratio is 88% or more to the hot rolled plate after the pickling；
Annealing operation keeps the cold-reduced sheet after the once cold rolling 60 seconds hereinafter, so within the temperature range of 660~760 DEG C
The temperature range of 450 DEG C or less and 300 DEG C or more is cooled to the average cooling rate of 10 DEG C/s or more afterwards, then with 5 DEG C/s
Above and 30 DEG C/s average cooling rate below is cooled to 140 DEG C of temperature ranges below；With
Secondary cold-rolling process carries out cold rolling to the annealed sheet with 10% or more and 40% reduction ratio below.
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| PCT/JP2018/012698 WO2018181450A1 (en) | 2017-03-31 | 2018-03-28 | Steel sheet, method for producing same, crown cap, and drawn and redrawn (drd) can |
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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 |
| CN103649353A (en) * | 2011-07-12 | 2014-03-19 | 杰富意钢铁株式会社 | Steel sheet for can and process for producing same |
| TW201631177A (en) * | 2014-12-26 | 2016-09-01 | 新日鐵住金股份有限公司 | Manufacturing method of steel sheet for crown cap and steel sheet for crown cap |
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| BR112013012558B1 (en) * | 2010-11-22 | 2018-06-05 | Nippon Steel & Sumitomo Metal Corporation | STEELING PLATE OF AGING HARDENING AFTER EXCELLENT ENDURING IN AGING RESISTANCE AFTER FINISHING COOKING, AND METHOD FOR YOUR PRODUCTION |
| KR101871735B1 (en) * | 2014-02-25 | 2018-06-27 | 제이에프이 스틸 가부시키가이샤 | Steel sheet for crown cap, method for manufacturing same, and crown cap |
| JP6354271B2 (en) * | 2014-04-08 | 2018-07-11 | 新日鐵住金株式会社 | High-strength hot-rolled steel sheet having a tensile strength of 780 MPa or more and excellent in low-temperature toughness, uniform elongation and hole expansibility, and a method for producing the same |
| MX2016014060A (en) * | 2014-04-30 | 2017-02-14 | Jfe Steel Corp | High-strength steel sheet and production method therefor. |
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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 |
| CN103649353A (en) * | 2011-07-12 | 2014-03-19 | 杰富意钢铁株式会社 | Steel sheet for can and process for producing same |
| TW201631177A (en) * | 2014-12-26 | 2016-09-01 | 新日鐵住金股份有限公司 | Manufacturing method of steel sheet for crown cap and steel sheet for crown cap |
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