JPH10245655A - Steel sheet for deformed three piece can and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a steel sheet for a deformed three piece can having an excellent formability and a high yield and to provide a method for producing the same. SOLUTION: A steel slab contg., by weight, 0.0005 to 0.05% C and 0.0002 to 0.01% B is subjected to hot rolling so as to regulate the finish rolling temp. to 800 to 1000 deg.C, is thereafter coiled in the temp. range of 500 to 750 deg.C, is subjected to primary cold rolling, and annealing of executing soaking in the temp. range of the recrystallization temp. to 850 deg.C and is then subjected to secondary cold rolling at <=20% draft, by which the (r) value in at least either the rolling direction or the direction perpendicular thereto is regulated to <=1.0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-piece can and a method for producing the same, and more particularly, to forming a barrel shape or the like by forming a steel plate into a cylindrical shape and then giving elongation strain in the circumferential direction. TECHNICAL FIELD The present invention relates to a deformed three-piece steel plate suitable for use in a three-dimensionally deformed three-piece can that is transformed into a shape having a three-dimensional product, and a method for producing the same.

[0002]

2. Description of the Related Art A can container can be roughly classified into a two-piece can composed of a can body and an upper lid and a three-piece can composed of a can body, an upper lid and a bottom lid. By the way, the above three-piece can is generally
The manufacturing process is relatively simple compared to that of a two-piece can, has the advantage of low initial investment for can-making machinery and equipment, and can cope with the production of many small-lot lots. It was frequently used as a pressure can (contents include coffee, tea, tea, etc.). By the way, conventional 3
The manufacturing process of piece cans is not particularly rigorous, most of which involve joining the can body after forming it into an inner cylinder, such as resin bonding, welding, or soldering, which is rarely done recently. After that, the upper lid and the bottom lid are assembled in the winding step, and the flange forming step to prepare for the winding step becomes a bottleneck in quality. That is, this flange forming process is a process of forming a flange portion extending outward in the diametric direction at both ends of the can body in order to cover the joined can body. Cracking will cause leakage of the can contents. Causes of such flange cracks include poor joining by welding, nonmetallic inclusions in the steel sheet, inappropriate trimming, softening of the heat affected zone, and hardening of the weld. However, with respect to such a problem in the can making process, Japanese Patent Application Laid-Open No. 8-92695 and Japanese Patent Application No. 7-2745 have been proposed.
By optimizing the steel composition and the secondary cold rolling reduction after annealing described in No. 58, it can be said that the problem of flange cracking was almost solved.

[0003]

However, in recent years, from the viewpoint of improving the design of the can and differentiating the can, a can having a three-dimensionally deformed shape (hereinafter referred to as "deformation 3") is not a simple cylindrical can.
Abbreviated as "peace can"). For example, the situation is introduced in the magazine "THE CANMAKER" Feb. 1996, p. The production of this type of can involves forming a cylinder, joining it, and then applying elaborate splitting, isostatic pressing, and other techniques to apply circumferential elongation strain to the cylindrical joining body. It is performed by. Problems that occur during this production include cracking, surface roughening, and changes in can dimensions. Given these issues,
The properties required for the steel sheet used for the deformed three-piece can are listed below. 1) The dimension does not decrease in the height direction of the can. If the dimension decreases in the height direction, it is difficult to secure the internal capacity. 2) To have sufficient shape freezing properties and to be able to faithfully reproduce a target shape. 3) No cracking near the joint. 4) No appearance defects such as rough skin and stretcher strain.

[0004] On the other hand, in spite of such a new movement, there has recently been a strong demand for a reduction in plate thickness as a means for reducing costs. This requirement is similarly necessary for the material for performing complicated secondary molding in the above-mentioned deformed three-piece can, and cannot be avoided. However, the reduction of the sheet thickness in such severe secondary forming is extremely severe in terms of material, especially in forming, and the conventional technology sufficiently satisfies the required characteristics. I couldn't do that. Therefore, the appearance of an ultra-thin steel plate for cans that can be used for deformed three-piece cans accompanied by severe secondary forming is expected.

Accordingly, the present invention solves the above-mentioned problems of the prior art, and has excellent moldability capable of responding to the requirements of a complicated can design, and a deformation 3 capable of exhibiting a high yield.
An object of the present invention is to provide a steel sheet for a piece can and a method for producing the same.

[0006]

Means for Solving the Problems The inventors have conducted a number of experiments and studies to solve the above problems. As a result, it is important not only to prevent the joint from cracking at the time of secondary processing of the joined can body, but also to prevent the joint from becoming hard and to improve the original formability of the material. It has been found advantageous to utilize low-carbon steel, preferably ultra-low-carbon steel, with a reduced amount. It has also been found that it is advantageous to apply secondary cold rolling after annealing in an appropriate range in order to prevent the occurrence of rough skin and stretch yard strain. Furthermore, as a result of investigating the dimensional change during secondary molding of the can body in detail using various materials,
R in the direction coinciding with the tensile direction in secondary molding during can-making
It has been found that limiting the value to 1.0 or less is effective. In addition, the tensile direction in the secondary molding referred to here is
As shown in FIG. 1, a plate is wound in a rolling direction to form a can, which is a so-called “normal winding”, which means a rolling direction (L direction), and a plate is rolled in a direction perpendicular to the rolling to form a can. In a plate removing method called "reverse winding", it means a direction perpendicular to the rolling direction (C direction). The gist configuration of the present invention completed on the basis of the above findings is as follows.

(1) C: 0.0005 to 0.05 wt%, B: 0.0002 to
A deformed three-piece steel sheet for cans containing 0.01 wt%, wherein the r value in at least one of the rolling direction and the direction perpendicular to the rolling direction is 1.0 or less.

(2) C: 0.0005 to 0.05 wt%, B: 0.0002 to
A normally wound deformable three-piece steel sheet containing 0.01 wt% and having an r value in the rolling direction of 1.0 or less.

(3) C: 0.0005 to 0.05 wt%, B: 0.0002 to
A reverse-winding deformable three-piece steel sheet containing 0.01 wt% and having an r-value in a direction perpendicular to the rolling direction of 1.0 or less.

(4) C: 0.0005 to 0.05 wt%, Si: 0.10 wt%
Hereinafter, Mn: 0.1 to 1.5 wt%, P: 0.04 wt% or less, S: 0.
(1) to (3) containing not more than 02 wt%, Al: 0.005 to 0.1 wt%, N: 0.003 wt% or less, and B: 0.0002 to 0.01 wt%, with the balance being a steel composition of Fe and unavoidable impurities. 3) The modified three-piece steel sheet for cans according to any one of the above.

(5) C: 0.0005 to 0.05 wt%, Si: 0.10 wt%
Hereinafter, Mn: 0.1 to 1.5 wt%, P: 0.04 wt% or less, S: 0.
N: less than 02 wt%, Al: 0.005 to 0.1 wt%, N: 0.003 wt% or less, and B: 0.0002 to 0.01 wt%, and N in Group A
b: 0.003 to 0.020 wt%, Ti: 0.003 to 0.020 wt%, B
Group Cu: 0.5 wt% or less, Ni: 0.5 wt% or less, Cr: 0.5 wt%
% Or less, Mo: 0.5 wt% or less, containing one or more selected from one or two groups, with the balance being Fe and the steel composition of unavoidable impurities, any of (1) to (3) above. The modified three-piece steel sheet for cans according to any one of the first to third aspects.

(6) C: 0.0005-0.05 wt%, B: 0.0002-
Steel slab containing 0.01wt%, finish rolling temperature 800 ℃ ~ 10
After hot rolling at 00 ° C., winding is performed at a temperature in the range of 500 to 750 ° C., and after first cold rolling, annealing is performed in a temperature range of recrystallization temperature to 850 ° C. for 60 seconds or less, followed by annealing. A method for producing a deformed three-piece can steel sheet, wherein the r value in at least one of the rolling direction and the direction perpendicular to the rolling direction is 1.0 or less, wherein the secondary cold rolling is performed at a rolling reduction of 20% or less.

[0013] (7) After the finish rolling, characterized in that to start the forced cooling within 0.5 sec, the production method of the modified three-piece steel sheet for cans of Claim 6

(8) The composition of the steel slab is C: 0.00
05-0.05wt%, Si: 0.10wt% or less, Mn: 0.1-1.5wt
%, P: 0.04 wt% or less, S: 0.02 wt% or less, Al: 0.005%
0.1% by weight, N: 0.0030% by weight or less and B: 0.0002-0.
Nb of group A: 0.003 to 0.0 as required.
20wt%, Ti: 0.003-0.020wt%, Cu of group B: 0.5wt%
Below, Ni: 0.5 wt% or less, Cr: 0.5 wt% or less, Mo: 0.5
(6) or (7), containing at least one selected from the group consisting of 1% or 2% by weight or less and the balance consisting of Fe and a steel composition of unavoidable impurities. Method for producing a deformed three-piece steel sheet for cans.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. (1) Regarding the steel component: C: 0.0005 to 0.05 wt% If C exceeds 0.05 wt%, the steel sheet becomes hard and the can-making property (particularly the shape freezing property at the time of secondary forming) is reduced. Further, in a weld can, a welded portion is hardened and cracks in a weld heat affected zone occur during flange processing. Therefore, the upper limit of the C content is set to 0.05 wt%. Further, when the C content is extremely low, it is necessary to perform secondary cold rolling at a high reduction rate in order to secure necessary can strength, so that ductility in the direction perpendicular to the rolling is deteriorated and the crystal grain size increases. As a result, the beauty of the appearance is impaired. Therefore, the C content is desirably 0.0005 wt% or more. From the viewpoint of improving workability, 0.02
wt% or less, more preferably 0.012 wt% or less.

Si: 0.10 wt% or less If Si is contained in a large amount, it causes problems such as deterioration of surface treatment properties and corrosion resistance. Therefore, the upper limit is set to 0.10 wt%.
In particular, when excellent corrosion resistance is required, the content is desirably 0.02% by weight or less.

Mn: 0.1 to 1.5 wt% Mn has an effect of preventing red hot embrittlement during hot rolling by S and reducing the size of crystal grains, and is an element necessary for securing a desired material. To exhibit these effects, it is necessary to add at least 0.1 wt% or more. On the other hand, if Mn is added in a large amount, the corrosion resistance is deteriorated, and the steel sheet is hardened to deteriorate the flange workability and the neck workability. Therefore, the upper limit is set to 1.5 wt%. In applications where better moldability is required, it is desirable to add 0.80 wt% or less.

P: 0.04 wt% or less P is a harmful element that hardens steel, deteriorates drawability and flange workability, and deteriorates corrosion resistance. In particular, if the amount of P exceeds 0.04 wt%, the effect is remarkable, so the content is limited to 0.04 wt% or less. When these characteristics are particularly important, it is desirable to suppress the content to 0.015 wt% or less, more preferably 0.01 wt% or less.

S: 0.02 wt% or less S is a harmful element that exists as an inclusion in steel and causes a reduction in ductility and a deterioration in corrosion resistance. Therefore, S is limited to 0.02 wt% or less. If workability is particularly required, 0.01wt%
It is desirable to control to the following range.

Al: 0.005 to 0.1 wt% Al is an element necessary as a deoxidizing material in steel making. If the addition amount is small, deoxidation becomes insufficient, inclusions increase, and flange workability deteriorates. On the other hand, if the content is too large,
The frequency of occurrence of surface defects caused by alumina clusters and the like increases. Therefore, the addition amount of Al is set to 0.005 to 0.1 wt%. In terms of material stability, 0.01
A range of about 0.08% by weight is desirable.

N: 0.003 wt% or less N is an element that enhances aging properties and increases the frequency of occurrence of stretch yard strain. Therefore, it is desirable to reduce as much as possible. By limiting the content to a range of 0.0030 wt% or less, such adverse effects can be suppressed, and practical problems can be prevented. The lower limit is not specified, but 0.0010wt
% Can be said to be a range that can be achieved industrially and economically. In addition, from the viewpoint of ensuring the stability of the material, 0.002 wt
% Is preferred.

B: 0.0002 to 0.01 wt% B is an extremely important element in the present invention, and its effect is to reduce the r value in the rolling direction and the direction perpendicular to the rolling direction by controlling the texture. Such a desirable effect of B is exhibited from the addition of 0.0002 wt% or more. On the other hand, if it is added in an amount exceeding 0.01 wt%, the effect is not only saturated, but also disadvantages such as generation of surface defects occur. Therefore, the amount of B is set to 0.0002 to 0.01 wt%. In addition, considering the stability of the material, 0.0005-0.
A range of 005 Owt% is preferred.

In addition to the above basic components, if necessary, Nb: 0.003 to 0.020 wt%, Ti: 0.003 to 0.020 wt%
Group A element consisting of: Cu: 0.5 wt% or less, Ni: 0.5 wt%
B comprising Cr: 0.5 wt% or less and Mo: 0.5 wt% or less
One or more or two or more elements selected from any one or two of the group elements can be added.

Nb: 0.003 to 0.020 wt%, Ti: 0.003 to 0.2%
020 wt% (above, group A elements) Nb and Ti are elements that contribute to uniform refinement of the steel sheet structure and decrease in aging property. These effects are 0.003 wt
% Or more, but even if 0.020 wt% or more is added,
Not only the effect is substantially saturated, but also the steel is hardened remarkably, making the rolling process difficult. The effects of these additions are exerted additively, and the effects are not offset by the combined addition.

Cu: 0.5 wt% or less, Ni: 0.5 wt% or less, C
r: 0.5 wt% or less, Mo: 0.5 wt% or less (above, element of group B) Cu, Ni, Cr and Mo are useful elements that can refine the structure of steel and solid-solution strengthen steel. It is added according to the required strength of the can. However, when these elements are added in excess of 0.5 wt%, the effect is saturated and the hardening increases, making the rolling process difficult. In addition, the effects of these elements can be used in a composite addition without being offset by each other. Therefore, each of these elements is 0.5
Add in the range of wt% or less. The effect of the addition of each of the above elements becomes apparent with the addition of 0.01 wt% or more.
It is desirable to add 0.01 wt% or more.

In addition, even if so-called tramp elements such as Sn are mixed, these amounts are generally 0.10 wt%.
If it is below, the influence on the use characteristics as a can can be neglected.

(2) Regarding production conditions: The production process of the steel sheet of the present invention may be in accordance with a conventional method, but in particular, continuous casting, rough hot rolling, finishing hot rolling, pickling, primary cold rolling and re-rolling. The step of crystal annealing-secondary cold rolling is suitable. The slab heating temperature does not need to be specified, and is described below.
Any condition can be applied as long as the finish rolling temperature can be ensured. The slab before hot rolling may be once cooled to room temperature and then reheated, or may be inserted into a heating furnace and heated without cooling.

Hot rolling In hot rolling following slab heating, finish rolling at a temperature of 800 to 1000 ° C. is required. Finish rolling temperature is 800
If the temperature is lower than ℃, it is difficult to uniformly refine the crystal grains of the sampled product, and the beauty of the appearance after the can is lost. However, when the finish rolling is performed at a temperature higher than 1000 ° C., the scale loss is undesirably increased. After finishing rolling, 0.
Starting forced cooling (cooling by spraying water etc. onto the steel sheet surface) within 5 seconds can suppress the in-plane anisotropy of the material and improve the descaling property. It is desirable to carry out.

Winding and pickling after hot rolling The winding temperature is in the range of 500 to 750 ° C. Winding temperature
When the temperature is lower than 500 ° C., the uniformity of the shape and the material in the width direction of the steel sheet decreases. On the other hand, when the temperature exceeds 750 ° C., the uniformity of the structure of the hot-rolled sheet decreases, and the scale thickness increases to decrease the descalability. Therefore, the winding temperature range is 500-750 ° C. In order to secure the stability of the material, the temperature is preferably 580 to 730 ° C. With regard to the pickling, there is no need to set any special restriction conditions, and the pickling may be performed with ordinary hydrochloric acid or sulfuric acid.

(1) Cold Rolling Cold rolling (referred to as primary cold rolling to distinguish from cold rolling after annealing) is not particularly required. In steel plates for cans such as the present invention, usually applied 75% or more,
Preferably, it may be in the range of about 80% or more. This value is higher than that of a general cold-rolled steel sheet (about 73%).

Continuous Annealing In the present invention, in order to obtain excellent secondary formability after cylindrical forming, it is necessary that the steel sheet be annealed at a recrystallization temperature or higher to have a recrystallized structure. Although there is a possibility of applying a partially recrystallized structure as a special use, it is difficult to secure a stable material. On the other hand, annealing at a temperature exceeding 850 ° C. tends to cause a shape defect phenomenon called a so-called heat buckle, which is caused by a thin steel sheet and a decrease in high-temperature strength. Therefore, annealing is performed in a temperature range from the recrystallization temperature to 85 ° C. or less. As for the annealing (soaking) time, if the soaking is performed for a long time exceeding 60 sec, the r value in the L and C directions may exceed 1.0, so that the skin may easily develop and the production efficiency may be impaired. So 60
The range is sec. There is no particular need to set the lower limit of the annealing time. Even if the soaking time is substantially 0 sec, there is no problem if the annealing temperature is set accordingly. Considering the stability of the material and operation in actual production, it is preferable to set the condition to 40 sec or less in the temperature range from the recrystallization temperature to 85 ° C.

Secondary Cold Rolling The rolling reduction of the secondary cold rolling is important for the following reasons.
In order to ensure the pressure resistance (paneling strength) of the body of a three-piece can, the strength varies depending on the size of the can. If the strength is lower than this, especially when used for negative pressure cans such as coffee cans, the can body buckles inward due to the difference between the internal pressure and external pressure of the can, or deforms due to local stress from the outside. Because it is easier, there is a high risk of defective cans. Therefore, when ultra-low carbon steel is used as in the present invention, it is necessary to impart secondary cold rolling after annealing to increase the strength. However, the secondary cold rolling reduction rate is
If it exceeds 20%, the ductility is reduced and the anisotropy of the material is increased, so that the flange workability and neck workability are deteriorated. Also, if this rolling reduction becomes too large,
Since the amount of strain released by welding is large and the softening in the heat affected zone is increased accordingly, flange cracks are likely to occur. Therefore, the secondary cold rolling reduction is set to 20% or less. In order to more effectively avoid this flange crack, it is desirable that the rolling reduction is 15% or less. The lower limit of the rolling reduction may be determined in consideration of the material, the control of the surface shape, and the like, but it is preferable to secure about 1.5% or more.

R Value of Steel Sheet If manufactured under the conditions described above, a steel sheet for cans suitable for a deformed three-piece can can be obtained. The material suitable for the deformed three-piece can, especially the r-value, is 2 as described above.
The r-value in the rolling direction received in the next working (see FIG. 2), that is, the r-value in the rolling direction is 1.0 or less when the sheet removing method is normal winding, and the r-value in the direction perpendicular to the rolling is 1.
Must be 0 or less. In the present invention, when the r value in the rolling direction or the direction perpendicular to the rolling direction is set to 1.0 or less, the axial direction of the cylinder can be improved when the cylindrical can body is subjected to secondary forming.
The results can be suppressed to a minimum the amount of shrinkage of direction, can improve the yield of the steel sheet. In this case, although the deformed portion is thinned, the strength of the can is not problematic because the processing is strengthened accordingly. It is desirable from the viewpoint of reducing the weight of the can body as compared with the case where a steel plate having a large r value is used.

[0034]

EXAMPLE 1 A steel containing the composition shown in Table 1 and having the balance substantially consisting of iron was smelted in a converter, and this steel slab was hot-rolled under the conditions shown in Table 2; Secondary cold rolling, continuous annealing, and secondary cold rolling were performed to produce a steel plate for cans having a final finished plate thickness of 0.19 mm. Subsequently, tin plating equivalent to No. 25 was continuously applied on a halogen-type electric tin plating line to finish the tinplate. The tensile strength and r value of the thus obtained tin-plated steel sheet in the rolling direction (L direction) and the direction perpendicular to the rolling direction (C direction) were examined. In these tests, JIS No. 13 tensile test pieces were used. These steel sheets were cylindrically formed into a 250 g can size, and then subjected to secondary forming using a press jig having a special split mold structure. The direction of the tensile strain during the secondary molding is the L direction (normal winding), and the elongation strain amount is 7% on average.
And As the evaluation items after the can-making, the presence or absence of cracking and the appearance of defects in the welded part, the heat affected zone, and other parts were examined. Further, a change in the height in the axial direction of the can before and after the secondary molding was examined. These results are summarized in Table 3. From these tables, it can be seen that in the examples of the present invention, cracks did not occur after the secondary molding, the surface appearance was good, and the change in can height due to the secondary molding was small.

[0035]

[Table 1]

[0036]

[Table 2]

[0037]

[Table 3]

Example 2 Using the No. 3 steel shown in Table 1, steel plates for cans were manufactured under various conditions shown in Table 4. Here, forced cooling by water cooling was performed within 0.3 seconds after finishing hot rolling. Next, a thin tin-plated steel sheet was manufactured in the same manner as in Example 1, and the mechanical properties and can body properties were investigated. Here, the plate removal for forming the can was set such that the rolling direction of the steel plate was parallel to the can axis direction (reverse winding). The test results are summarized in Table 5. From these tables,
Any steel sheet for cans manufactured according to the method of the present invention,
Since the r-value is controlled in an appropriate range, no crack is generated after the secondary molding, the surface appearance is good, and the change in the can height due to the secondary molding is small.

[0039]

[Table 4]

[0040]

[Table 5]

From the above examples, according to the present invention, the amount of shrinkage in the can axis direction during the secondary processing is small, so that the initial blank shape can be made smaller. As a result, the improvement in yield is about 2%, but it can be said that this is a remarkable effect in a product field where the production volume is extremely large. Note that FIG.
The relationship between the change in can height and the r-value in the rolling direction is shown below for the data of a 0.22-mm thick Ni-tin plated steel sheet that was normally wound.

[0042]

As described above, according to the present invention, it is possible to produce a three-dimensionally deformed can by forming a cylindrical shape and applying elongation strain in the circumferential direction. The amount of shrinkage in the axial direction of the can can be reduced, and the yield of the material can be improved. Further, the steel sheet for cans obtained in the present invention, in addition to tin plating, Ni plating, Ni-tin plating, or tin plating in which Ni is diffused in iron, chrome plating, plating treatment such as composite plating, The same effect can be obtained by applying various treatments such as oiling treatment without plating and resin film bonding.

[Brief description of the drawings]

FIG. 1 is a diagram showing a normal winding and a reverse winding in plate cutting of a can molding material.

FIG. 2 is a diagram illustrating a state of secondary forming processing in which tensile strain is applied in a circumferential direction after cylindrical forming.

FIG. 3 is a graph showing a relationship between an r value and a change in can height after secondary molding.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makoto Aratani 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Works Chiba Works (72) Inventor Hideo Kuguminato 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Inside the Chiba Works, Steel Works Ltd. (72) Inventor Tatsuo Minoru 1, Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Inside the Chiba Works, Kawasaki Works

Claims (8)

[Claims] (1) C: 0.0005 to 0.05 wt%, B: 0.0002 to 0.01
A steel sheet for deformed three-piece cans, which contains wt%, and has an r value of 1.0 or less in at least one of a rolling direction and a direction perpendicular to the rolling direction. 2. C: 0.0005-0.05 wt%, B: 0.0002-0.01
A normally wound deformable three-piece steel sheet containing wt% and having an r value in the rolling direction of 1.0 or less. 3. C: 0.0005-0.02 wt%, B: 0.0002-0.01
A reverse-winding deformable 3-piece can steel sheet containing wt% and having an r value in a direction perpendicular to the rolling direction of 1.0 or less. 4. C: 0.0005 to 0.05 wt%, Si: 0.10 wt% or less, Mn: 0.1 to 1.5 wt%, P: 0.04 wt% or less, S: 0.02 wt%
The steel composition of any one of claims 1 to 3, containing at most 0.005% by weight of Al, 0.005 to 0.1% by weight of Al, 0.003% by weight or less of N and 0.0002 to 0.01% by weight of B, the balance being Fe and a steel composition of unavoidable impurities. 3. The modified three-piece steel sheet for cans according to claim 1. 5. C: 0.0005 to 0.05 wt%, Si: 0.10 wt% or less, Mn: 0.1 to 1.5 wt%, P: 0.04 wt% or less, S: 0.02 wt%
wt% or less, Al: 0.005 to 0.1 wt%, N: 0.003 wt% or less and B: 0.0002 to 0.01 wt%, and Nb in Group A:
0.003 to 0.020 wt%, Ti: 0.003 to 0.020 wt%, group B
Cu: 0.5 wt% or less, Ni: 0.5 wt% or less, Cr: 0.5 wt% or less, Mo: 0.5 wt% or less, containing one or more selected from one or two groups, the balance being Fe and inevitable. The steel plate for deformed three-piece cans according to any one of claims 1 to 3, wherein the steel plate has a steel composition of a chemical impurity. 6. C: 0.0005-0.05 wt%, B: 0.0002-0.01
Steel slab containing wt%, finish rolling temperature 800 ℃ ~ 1000 ℃
After hot rolling at 500 ° C to 750 ° C, annealing is performed after the first cold rolling, soaking at a temperature of recrystallization temperature to 850 ° C for 60 seconds or less.
R in at least one of a rolling direction and a direction perpendicular to the rolling direction, wherein the secondary cold rolling is performed at 20% or less.
For producing a steel sheet for deformed three-piece cans having a value of 1.0 or less 7. The method according to claim 6, wherein forced cooling is started within 0.5 sec after finish rolling. 8. The steel slab having a composition of C: 0.0005 to 0.0005.
0.05 wt%, Si: 0.10 wt% or less, Mn: 0.1-1.5 wt%,
P: 0.04 wt% or less, S: 0.02 wt% or less, Al: 0.005 to 0.1
wt%, N: 0.003 wt% or less and B: 0.0002 to 0.01 wt%
%, And if necessary, Nb of Group A: 0.003 to 0.020 wt%
%, Ti: 0.003 to 0.020 wt%, Cu in Group B: 0.5 wt% or less, Ni: 0.5 wt% or less, Cr: 0.5 wt% or less, Mo: 0.5 wt%
The modified three-piece according to claim 6, wherein the modified three-piece contains one or more selected from one or more of the following two groups, with the balance being Fe and a steel composition of unavoidable impurities. Manufacturing method of steel sheet for cans.