JP2002060900A - Steel sheet for drawn can with excellent earring property and manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel plate for drawn cans which is extremely excellent in earring properties and is provided for a drawn can formed in which extremely severe earring characteristics are required, and a manufacturing method thereof. SOLUTION: (1) C: 0.010 to 0.100% by weight, N: ≦ 0.0060% by weight, B: B / N = 0.5 to
850 ° C. to 95%
After finish rolling at 0 ° C. to form a hot-rolled steel strip, 85 to 92
% Within the range of the cold rolling rate of 0.5% at a cold rolling rate at which the Δr value after recrystallization annealing becomes almost zero, and 5 ° C./sec in continuous annealing.
A method for producing a steel sheet for drawn cans having a Δr value of +0.15 to −0.08, which is extremely excellent in earring properties, wherein the steel sheet is subjected to recrystallization annealing and temper rolling at the above heating rate. (2) The plated steel sheet for drawn cans according to (1), wherein the surface of the steel sheet is Ni-plated, Ni-diffusion-plated, Sn-plated, or TFS-plated and has extremely excellent earring properties.
(3) A method for producing a steel sheet for drawn cans, in which a further excellent earring property is stably obtained over the entire length in the longitudinal direction of the coil, wherein the hot-rolling winding temperature is 350 ° C to 670 ° C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel sheet for drawn cans having extremely excellent earring properties and a method for producing the steel sheet.

[0002]

2. Description of the Related Art A steel sheet for drawn cans is a cold-rolled steel sheet or a plated steel sheet which has been subjected to various platings such as Sn plating, Ni plating, Cr plating and Sn-Ni plating. (Drawn & Ironed) processing, etc., and a can container such as a battery can (simply called a drawn can)
Or Sn plating, Ni plating,
Various types of plating or painting such as Cr plating and Sn-Ni plating are applied to form a can container.

[0003] As a prior art, a method disclosed in Japanese Patent Publication No. Hei 7-59734 or "Sheet Metal Press Forming Subcommittee 29th S.
There is a technology introduced in the MF seminar material “Latest trends in can-making technology and can-making materials (October 7, 1994 at Nagoya University)” / Reference-1 ”. Demand for further improvement in steel sheet yield accompanying the increase in the drawing speed of the draw forming of battery cans, etc. As a result, in the multi-stage pressing & DI drawing process, progressive trouble between steps due to earrings, and pressing flaws due to tears at the earring tip For example, a method in which the Δr value is simply reduced to about zero as in Japanese Patent Publication No. 7-59734, for example, requires extremely excellent earring properties. Insufficiently, some of them can not withstand the forming of drawn cans, such as stricter battery cans.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a steel sheet for drawn cans which is extremely excellent in earring properties and which is used for drawing can forming which requires extremely strict earring characteristics, and a method of manufacturing the same. That is.

[0005]

Means for Solving the Problems The inventors of the present invention have provided a steel sheet and a manufacturing method which solve the above-mentioned problems.
The present invention has been completed through intensive studies, and the gist of the invention is as follows. (1) By weight%, C: 0.010 to 0.100%, S
i: 0.35%, Mn: 1.0%, P: 0.07
0%, S: ≦ 0.025%, solAl: 0.005
0.100%, N: ≦ 0.0060%, B: B / N =
0.5 to 2.5, with the balance being Fe and unavoidable elements, with a plate thickness t of 0.15 to 0.60 mm and a Δr value of +
A drawing with extremely excellent earring properties, characterized in that the crystal orientation of the steel sheet is randomized by setting the heating rate during recrystallization annealing to 5 ° C./sec or more in the range of 0.15 to −0.08. Steel plate for cans.

(2) A plated steel sheet for drawn cans according to the above (1), wherein the surface of the steel sheet is Ni-plated, Ni-diffusion-plated, Sn-plated, or TFS-plated and has extremely excellent earring properties. (3) By weight%, C: 0.010 to 0.100%, S
i: 0.35%, Mn: 1.0%, P: 0.07
0%, S: ≦ 0.025%, solAl: 0.005
0.100%, N: ≦ 0.0060%, B: B / N =
A slab having a composition of 0.5 to 2.5, with the balance being Fe and unavoidable elements, is heated to 1000 ° C. or more,
After finish rolling at 0 ° C., after finishing rolling, cooling, winding, and hot-rolled steel strip, the Δr value after recrystallization annealing is almost zero within the range of 85-92% cold rolling reduction ( +0.15
Cold rolling rate is set so as to be in the range of -0.08), cold-rolled to 0.15 to 0.60 mm, and then continuously annealed at a heating rate of 5 ° C / sec or more. A steel sheet for drawn cans having a Δr value of +0.15 to −0.08, which is extremely excellent in earring properties, characterized in that the steel sheet is soaked at a temperature equal to or higher than the crystallization temperature and temper-rolled at 0.5 to 10.0%. Manufacturing method.

(4) The drawn can in (3) above, wherein the hot-rolling winding temperature is 350 to 670 ° C., and further excellent earring properties can be stably obtained over the entire length in the longitudinal direction of the coil. Manufacturing method for steel sheet. (5) In the above (3) and (4), after continuous annealing is performed as recrystallization annealing, overaging treatment is performed in a box annealing furnace in a temperature range of 300 to 600 ° C, and the earring and softness are characterized. This is a method for producing steel sheets for drawn cans that have excellent aging characteristics.

(6) In the above (3) to (5), the surface of the manufactured steel sheet is subjected to Ni plating, Ni diffusion plating, Sn plating, and TFS plating, and the earring is excellent in drawability. Manufacturing method of plated steel sheet. (7) In the above (3) to (5), after cold rolling, pretreatment such as degreasing is performed, Ni electroplating is performed, and then recrystallization annealing, recrystallization softening annealing and diffusion of the Ni plating layer are performed. The present invention provides a method for producing a Ni diffusion plated steel sheet for a drawn can for a battery, which is characterized by performing continuous annealing also serving as heat treatment, which is improved in workability and adhesion of a plating layer, and which is extremely excellent in corrosion resistance and earring property.

Hereinafter, the present invention will be described in detail. The present inventors have also shown in FIG. 4 of the above-mentioned Document-1 that “Although good earring properties can be obtained by setting the Δr value to almost zero,
However, even when the value of Δr is set to zero, the earrings vary greatly from 1.0% to 3%, and the earrings are not reduced to 1% or less. Focusing on the large variation even when the Δr value is zero, a method for further improving the earring value was studied.

The present inventors have found that the high r value (about 2.0 level) shown in FIG.
C-0.118Ti (so-called ultra-low carbon steel with Ti added), high Al-Al-K disclosed in Japanese Patent Publication No. 7-59734
For various steel types, such as a method of BAF (box annealing) of steel, etc., adjust the cold rolling reduction (87-88%), which is introduced that the earring property is the best, and perform recrystallization annealing to 1.0% Temper rolling to produce cold-rolled steel sheet, prototype drawing cans, Δr value ｛= (r0 + r90) / 2-r4
5. . . . r0, r90, 45: The angle between the direction of the tensile test specimen for measuring the r value and the rolling direction is 0, 90,
The relationship between each r value｝ at 45 ° and earring properties was investigated.

The Δr value and the earring rate of the investigated steel sheet [=
The relationship between 山 (peak height (maximum value of the ridge cup side wall ridge height) −minimum valley height (minimum value of the valley cup side wall valley height)) / average wall height｝ × 100] Although the relationship with the earring rate was recognized, it was found that the difference between the steel types was large in the range of the cold rolling rate that was optimized to some extent.
In order to investigate the cause, the present inventors investigated the r values of various types of steel plates at a pitch of 15 degrees from 0 to 90 degrees,
The in-plane anisotropy of the r value was investigated in detail, and the relationship with the earring property was compared and examined.

As a result, (1) The maximum value of the r value is 90,7
5, 60, 45 °, and the minimum value exists at the position of 0, 15, 30, 45 °, and 0, 45, 9 used for calculating the Δr value.
There is a direction other than the 0 ° direction, and the defined Δr value is 0 to
Not necessarily the maximum deviation of the r value between 90 °,
(2) The definition of the measurement direction in the definition of the earring rate and the definition of the Δr value should be considered to be caused by the fact that they do not match as described above. Therefore, Δr _{max obtained} by subtracting the minimum value from the maximum value of the r value measured at a pitch of 15 degrees
As a result of investigating the relationship between the value and the earring property, a good correlation was recognized, and it became clear that it was necessary to consider a production method for minimizing the Δr _max value. In addition, it was confirmed that the Δr value was an effective method because the number of measurement points was small and the test was easy to obtain the optimum cold rolling reduction of the steel type.

The present inventors have concluded that the subject of the present invention, "a steel sheet for drawn cans having extremely excellent earring properties", is the Δr _max value and the earring rate of steel sheets manufactured under the various compositions and manufacturing conditions described above. As a result of analyzing the results of the investigation in detail, it was found that B-added Al-K is low-carbon A produced by a continuous annealing method conventionally used for DI beverage cans and having good earring properties.
Steel having a possibility of obtaining an essentially superior earring property than N-added ultra-low carbon steel which is also applied to 1-K steel (low CT) and battery cans requiring good earring property It was found that.

The present inventors have also studied the conditions under which good earring properties can be obtained with a B-added Al-K steel,
C, N, B / N and the heating rate at the time of recrystallization annealing after cold rolling are important, and it is possible to randomize the crystal orientation after annealing by optimizing them. Was. In addition, it is a necessary requirement that the cold rolling is performed at an optimum cold rolling reduction for the type of steel and the cold rolling is performed as in the case of the conventional knowledge.

FIG. 1 is a graph based on the above findings.
Low CT (660 ° C winding) of K steel (B-Al-K):
L. CT), high CT (690 ° C winding: H.CT), and B-added ultra-low carbon steel (B-SULC-LC) with a C content of 0.0020% and a low temperature winding as comparative steel.
T) The hot-rolled sheet was cold-rolled while changing the cold-rolling rate, and the temperature was 15 ° C./sec.
680 ° C. (B-SULC is 730 ° C.)
C), a cold-rolled steel sheet that has been continuously annealed at a soaking temperature of 1.5% and temper-rolled by 1.5%, and a low-temperature steel sheet manufactured by a continuous annealing method which is conventionally used for DI beverage cans and has good earring properties. C
Cold rolled steel sheet of low carbon Al-K steel (Al-KL-CT) of T, high temperature winding Nb-added ultra low carbon steel (Nb) which is also applied to battery cans that require good earring properties -S
ULC-H. FIG. 3 shows a relationship between the Δr value and the earring ratio of the cold-rolled steel sheet obtained as a prototype.

As is clear from the investigation results shown in FIG. 1, the B-added low-carbon Al-K steel of the present invention (1) is such that only B-added low-carbon steel obtains the desired excellent earring properties. (2) The recrystallization annealing is set to continuous annealing (heating rate: 5 ° C./sec or more), and the cold rolling rate is adjusted.
It can be seen that the steel sheet in which the Δr value is controlled to +0.15 to −0.08 has excellent earring properties. Furthermore, as a result of examining the variation in the earring properties of the drawing steel sheet manufactured by winding the B-added low-carbon steel at a low temperature, the effect of low variation in the heating rate in the coil longitudinal direction, the width direction and the soaking temperature by continuous annealing, It was also confirmed that extremely low earrings were obtained over a wide range.

(1) In box annealing, the Δr _max value due to temperature variation in the coil varies greatly in the longitudinal direction of the coil. (2) The composition of the steel is B-added steel. (3) In the case of Ti-added steel, even if the so-called Δr value is set to zero, the r value in the 60-degree direction is extremely high and the r value in the 15-30 degree direction is extremely low. It is extremely low, and no matter how the cold-rolling rate is adjusted, the Δr _max value cannot be reliably reduced to 0.40 or less, and good earring cannot be obtained. (4) In the case of Nb-added ultra-low carbon steel, components, hot rolling conditions, cold rolling conditions, the very low earrings level is the target of the While the invention [Delta] r _{ma x} value is improved by optimizing the annealing conditions were also findings can not be reached. Incidentally, the extremely low earring property of the steel of the present invention is as follows.
Even in the case of a diffusion Ni-plated steel sheet subjected to i-plating, Δr
When the value is +0.15 to -0.08, extremely excellent earring characteristics are obtained.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The detailed description of the constituent conditions of the present invention will be given below. If C is less than 0.010% by weight, even if the Δr value is in the range of +0.15 to −0.08, the earring properties deteriorate, and good earring properties cannot be obtained.
On the other hand, if the content exceeds 0.10%, the quality of the steel sheet becomes high, the drawability deteriorates, and the steel sheet cannot be used for drawing cans. Therefore, it is necessary to regulate the C content to 0.010 to 0.10% by weight.
0.35% by weight of Si adversely affects plating adhesion and coating adhesion when painted after can making.
It is necessary to regulate as follows.

If Mn is contained in a large amount, it becomes hard and cannot withstand severe deep drawing, so it must be regulated to 1.0% by weight or less. P may be added as necessary because it increases the strength of the steel sheet. However, if it exceeds 0.070% by weight, the quality becomes high and the drawability deteriorates. At a low temperature such as −10 ° C., for example, the end of the side wall of the can may be brittlely broken due to an impact at the time of dropping or bending distortion. Therefore, it is necessary to regulate the amount to 0.070% by weight or less.

S inhibits the brittleness during hot rolling and causes the hot-rolled steel strip to have a rough edge. Therefore, S must be restricted to 0.025% by weight or less. solAl is an element necessary for obtaining a good surface quality when producing a cast slab.
It must be contained in an amount of 5% by weight or more.
If it exceeds 0% by weight, not only does this effect saturate and the cost becomes high, but also the adverse effect of excessive hardening due to solid solution strengthening occurs, so it is necessary to regulate it to 0.10% by weight or less.

N is an element which is combined with Al to change the crystal texture of the crystal due to the refinement or coarsening of the crystal grains, thereby greatly affecting the earring. Further, it is an element that greatly affects aging deterioration of materials due to N aging. In the steel of the present invention, B is added to prevent the harmful effects and instability of the properties due to N. However, if the amount is too large, the harmful effects will occur.
It is necessary to regulate as follows.

B is added to prevent adverse effects on earrings due to N and AlN.
If it is less than 0.5 (weight% ratio), the adverse effects of N and AlN cannot be prevented, and if it exceeds 2.5, excessively added B
When the amount is too large, hardening due to solid solution B and adverse effects on earring properties start to appear, so that B / N (weight% ratio) is set to 0.1.
It is necessary to regulate to 5 to 2.5. And the remainder is Fe
And steel composition consisting of unavoidable elements.
In addition, Cu, N
i, Cr, Sn, etc. are 0.5, 0.5, 0.3,
If it is less than about 0.05% by weight, there is no significant effect on the earring characteristics, so that it may be contained.

The steelmaking conditions of the steel sheet for drawn cans of the present invention need not be particularly limited as long as the steel having the above-described composition can be melted and made into slabs, and slabs may be formed by a usual method. The hot rolling condition is an important step to make the crystal grains of the drawn steel sheet into a predetermined one.
It is necessary to perform finish rolling at from ℃ to 950 ° C, cool after finishing rolling, and make it into a rolled hot rolled steel strip. In particular, the finish rolling temperature is important, and if it is lower than 850 ° C., rolling is performed in the α region, the texture is greatly changed, the Δrmax value is deteriorated, and the earring property is deteriorated. On the other hand, if the finish rolling temperature is too high, the crystal grains of the hot-rolled sheet become too large, and good earring properties cannot be obtained. In addition, the heating temperature is set to 1000 ° C. or more when the temperature is lower than 1000 ° C.
This is because a finishing temperature of 0 ° C. or more cannot be secured.

Excellent earring characteristics can be obtained without any special restriction on the coiling temperature of hot rolling. However, if the coiling temperature is 350 to 670 ° C., the coil can be stably formed over the entire length of the coil. Further excellent earring characteristics can be obtained. The rolling rate of cold rolling, using a hot-rolled sheet manufactured under the manufacturing conditions of the present invention, in advance, by changing the cold-rolling rate to produce a steel sheet for drawn cans or a plated steel sheet, the cold rolling rate and the Δr value The relationship was determined, and the Δr value of the steel sheet was almost zero (+0.15 −−
The cold rolling reduction may be set so as to be in the range of 0.08). The range of the cold rolling ratio at which excellent earring properties can be obtained is 8
5 to 92%.

When the sheet thickness exceeds 0.60 mm, the hot-rolled sheet becomes too thick and a cold rolling load is applied too much to obtain excellent earring properties, so it is necessary to regulate the thickness to 0.60 mm or less. . Conversely, if the thickness is less than 0.10 mm, the thickness of the hot-rolled sheet becomes too thin and the finishing temperature cannot be secured, so the thickness of the cold-rolled sheet is regulated to 0.10 mm or more. In the recrystallization annealing, if the heating rate is less than 5 ° C./sec, the randomization of the recrystallization texture becomes insufficient and excellent earring properties cannot be obtained. And recrystallization annealing is required.
Box annealing (referred to as BAF) is used for the recrystallization annealing method.
Method and continuous annealing (CAL) method. In the BAF method,
Since the heating rate is too slow to obtain a heating rate of 5 ° C./sec or more, it is necessary to perform continuous annealing. In addition, the continuous annealing method has an advantage that variations in the earring characteristics due to the difference in annealing temperature between the coil stacking position and the inner, central, and outer peripheral portions of the coil as in the BAF annealing method can be prevented.

When producing a steel sheet for drawn cans which is soft and has excellent aging resistance, after continuous annealing, a box annealing method is used.
What is necessary is just to heat to the temperature range of 0-600 degreeC, and to perform an overaging process. In temper rolling, if temper rolling is performed at 0.5 to 10.0%, the shape is excellent, and if the degree of temper is selected, a steel sheet for drawn cans having an appropriate yield point can be obtained. The temper reduction ratio is required to be 0.5% or more in order to improve the shape, and if it exceeds 10.0%, it becomes too hard, so it is preferable to set it to 0.5 to 10.0%.

The surface treatment of the steel sheet is not particularly limited as long as the surface of the manufactured cold-rolled steel sheet is subjected to Ni plating, Ni diffusion plating, Sn plating, and TFS plating as required.
Also, after cold rolling, after performing pretreatment such as degreasing, Ni electroplating is performed, and then continuous annealing combined with recrystallization annealing, recrystallization softening annealing of the Ni plating layer, and diffusion heat treatment is performed. It is possible to manufacture a Ni diffusion-plated steel sheet for battery drawn cans, which has improved workability and adhesion of the plating layer and is extremely excellent in corrosion resistance and earring property.

[0028]

EXAMPLES The effects of the present invention will be described below with reference to examples. A slab having the components shown in Table 1 was produced, a hot-rolled sheet was manufactured under the hot rolling conditions shown in Table 2, and cold-rolled at a cold rolling rate at which the Δr value examined in advance became almost zero. In, 0.25m
m was prepared, and the Δr value and the earring rate of a cylindrical drawing of φ30 mm {= (maximum peak height of can side wall−minimum valley height) / (minimum valley height × 100)} were evaluated. Table 2 shows the evaluation results.

The test steels B, C and D are steels in the component range of the present invention, and steel A is a low carbon Al-K steel of a conventional example having good earring properties and conventionally used for beverage DI cans. Steel E is a comparative component steel having a C content of 0.002% by weight outside the range of the present invention, steel F is a comparative component steel having a C content as high as 0.150%, and steel G is Ti. Of steels containing 0.045% by weight of Ti as a conventional example of a deep-drawing steel sheet for automobiles having a low carbon content, and steel H is an extremely low Nb-added steel sheet having excellent earring properties conventionally used for battery cans and the like. It is a conventional component steel of carbon.

Sample Nos. 3, 4, 6, and 7 are examples of the present invention in which the component steels B, C, and D of the present invention were manufactured under the hot rolling, cold rolling, annealing, and temper rolling conditions of the present invention. The steel B of the present invention was used, but the recrystallization annealing rate after cold rolling was 0.03.
Comparative Example in which the conditions of the present invention were deviated from ° C / sec, Sample No.
1, 2, 8, 9, 10, and 11 are comparative examples or conventional examples in which the hot rolling, cold rolling, and annealing conditions are within the production conditions of the present invention but the steel composition is out of the range of the present invention. , 6 are Ni-plated steel sheets subjected to temper rolling after recrystallization annealing and then Ni-plated, without diffusion treatment. Samples 2, 3, 4, and 5 are each subjected to cold-rolled steel sheets and electroplated with 2 μm Ni. It is the Example of this invention and the comparative example of the Ni diffusion plating steel plate manufactured by performing recrystallization annealing, softening recrystallization of Ni, and diffusion alloying process after plating, and performing temper rolling.

Sample Nos. 3, 4, 6, and 7 of Examples of the present invention
In each case, the Δr value is almost zero and the earring rate is also 0.
Sample No. 3, which is an example of low-temperature winding according to claim (4), which is excellent at 3, 0.5, 0.4, and 0.3%.
No. 7 has an extremely excellent value of the earring rate of 0.3%. On the other hand, in sample No. 5, the steel component is steel B, which is the same as that of the present invention, but the recrystallization annealing is performed by a box annealing method (BA) at a heating rate of 0.03 ° C./sec, which is out of the range of the present invention. In the comparative example described above, the obtained characteristic value has a Δr value of almost zero, but the earring rate is 1.0%, which is a level just one step away.

Samples Nos. 8 and 9 were steels to which B was added in the same manner as in the present invention, but had a C content of 0.002 and a C content of 0.002, respectively.
0.15% by weight, which is out of the range of the present invention.
Sample No. 8 had an unsatisfactory earring value of 1.7% because the C content was too low, and Sample No. 9 was too hard because the C content was too high and was broken by the cup drawing of the earring test. In addition, Sample Nos. 1, 2, 10, and 11 were conventionally made of steel plates for beverage cans,
The steel plates have been used for deep drawing steel sheets for automobiles, steel sheets for battery cans, and the like. The Δr values are almost zero, but the earring values are 1.4, 1.0, 2.4, and 1. 4
% And bad.

As is clear from the results of the above embodiments,
The steel sheet of the present invention is to solve the problem to be solved by the present invention: to provide a steel sheet for drawn cans having extremely excellent earring properties and a manufacturing method to be used for forming a drawn can which requires extremely severe earring characteristics. Achievable enough. The steel sheet for drawn cans of the present invention is subjected to severe multi-stage deep drawing and severe D after being subjected to various platings such as Sn plating, Ni plating, Ni diffusion plating, Cr plating, and Sn-Ni plating.
I processing is performed, and it is made into a deep drawing can.
Various platings or coatings such as n-plating, Ni-plating, Cr-plating, and Sn-Ni-plating are performed, and the resultant is applied to various can containers including a battery can to exhibit its effect.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

As described above, the present invention has been described in detail. However, the steel sheet of the present invention has a problem to be solved by the present invention, namely, the problem to be solved by the present invention is that the steel sheet can be used for forming a drawn can that requires extremely severe earring characteristics. Providing an extremely excellent steel sheet for drawn cans and a manufacturing method ”can be sufficiently achieved, and the industrial value is extremely large.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between an earring ratio and a Δr value of a steel sheet manufactured under various manufacturing conditions.

Continued on the front page F term (reference) 4K024 AA03 AB01 BA03 BB23 BB25 BC01 DA04 DB01 GA08 GA16 4K037 EA01 EA02 EA05 EA15 EA18 EA23 EA25 EA27 EB06 EB08 FA02 FC04 FE01 FE02 FE03 FH01 FJ01 FL01 FL02 FL05 FM02

Claims (7)

[Claims] 1. Weight%, C: 0.010-0.100%, Si: ≦ 0.35%, Mn: ≦ 1.0%, P: ≦ 0.070%, S: ≦ 0.025 %, SolAl: 0.005 to 0.100%, N: ≦ 0.0060%, B: B / N = 0.5 to 2.5, the balance being Fe and an unavoidable element, and the plate thickness t 0.15 to 0.60 mm, Δr value is +0.15 to −0.
08, the heating rate during recrystallization annealing is 5 ° C./sec.
A steel sheet for drawn cans having extremely excellent earring characteristics, wherein the crystal orientation of the steel sheet is randomized by the above. 2. The plated steel sheet for drawn cans according to claim 1, wherein the surface of the steel sheet is Ni-plated, Ni-diffusion-plated, Sn-plated, or TFS-plated and has extremely excellent earring properties. 3. In% by weight, C: 0.010 to 0.100%, Si: ≤ 0.35%, Mn: ≤ 1.0%, P: ≤ 0.070%, S: ≤ 0.025 %, SolAl: 0.005 to 0.100%, N: ≦ 0.0060%, B: B / N = 0.5 to 2.5, the balance being Fe and unavoidable elements.
Heat to 000 ° C or more, perform finish rolling at 850 to 950 ° C, cool after finishing rolling, take up, hot rolled steel strip, recrystallize within the range of 85 to 92% cold rolling reduction The cold rolling reduction is set so that the Δr value after annealing becomes almost zero (in the range of +0.15 to −0.08).
After cold rolling to 60 mm, 5 ° C / sec by continuous annealing
At a heating rate of c or more, heat and soak above the recrystallization temperature,
A method for producing a steel sheet for drawn cans having an extremely excellent earring property having a Δr value of +0.15 to −0.08, wherein temper rolling is performed at 0.5 to 10.0%. 4. The steel sheet for drawn cans according to claim 3, wherein the hot-rolling winding temperature is 350 to 670 ° C., and further excellent earring properties are stably obtained over the entire length in the longitudinal direction of the coil. Manufacturing method. 5. The earring and softness according to claim 3, wherein after continuous annealing is performed as recrystallization annealing, overaging is performed in a box annealing furnace in a temperature range of 300 to 600 ° C. A method for producing steel sheets for drawn cans that has excellent aging characteristics. 6. The method according to claim 3, wherein the surface of the manufactured steel sheet is Ni-plated, Ni-diffusion-plated, Sn-plated, TF-plated.
A method for producing a plated steel sheet for drawn cans, which is extremely excellent in earring characteristics, characterized by applying S plating. 7. The method according to claim 3, wherein after cold rolling, pretreatment such as degreasing is performed, Ni electroplating is performed, and then recrystallization annealing, recrystallization softening annealing of the Ni plating layer, and diffusion heat treatment are performed. A method for producing a Ni diffusion plated steel sheet for battery draw cans having improved workability and adhesion of a plating layer, and having extremely excellent corrosion resistance and earring properties, characterized by performing continuous annealing that also serves as a step.