JPH10251799A - Steel sheet for easy-open can top excellent in top openability and rivet formability, its production and easy-open can top - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a steel sheet for an easy-open can cover excellent in pressure resistance, corrosion resistance, impact resistance, cover openability and revert formability by specifying the compsn. in which the contents of C, B, Al and O are regulated and composed of C, Si, Mn, S, B, Al, N, O and Fe. SOLUTION: This steel sheet for an easy-open can cover is the one having a compsn. in which the contents of C and Al are regulated, contg., by weight, <=0.02% C, <=0.05% Si, <=0.6% Mn, <=0.020% S, 0.010 to 0.020% B, <=0.010% Al, <=0.02% N and 0.010 to 0.030% O, furthermore contg., at need, prescribed amounts of Nb, Ti Cr and Mo and the balance Fe with inevitable impurities, and the average grain size of B oxides is preferably regulated to 0.1 to 20μm. This steel sheet is obtd. by subjecting a steel slab having the above componental compsn. to hot rolling at >=800 deg.C finishing temp., coiling it at 450 to 700 deg.C, executing primary cold rolling and recrystallization annealing and thereafter subjecting it to secondary cold rolling at <=30% draft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel plate suitable for use as a can lid of an easy-open can, a method for producing the same, and a can lid, and more particularly to a steel plate for an easy-open can lid having excellent openability and rivet forming properties. Various coatings, organic resin coatings, surface coatings such as organic resin films, etc.) and methods for producing the same, and can lids produced using this steel sheet.

[0002]

2. Description of the Related Art By introducing a cut called a score into a can lid of a can in advance, the can can be opened without using a special tool such as a can opener, and foods and beverages inside the can can be taken out. So-called easy open can lids (Easy Open End, EOE) are used for various beverage cans and food cans, including beer cans, carbonated beverage juice cans, and the like. As a type of such a can lid, there is a "pull-off type" in which a tab serving as a so-called "lever" or "handle" is cut off and separated when the lid is opened, and a state in which the tab is attached to the can after the lid is opened "Stion type". In addition, when divided according to the size of the lid opening part, there are a partial easy open end where the opening is made partially to the can diameter, and a full easy open end where almost the entire opening is opened. It is.
The above-described scoring (cutting for improving the openability) has a great effect on the ease of opening these easy-open can lids (hereinafter abbreviated as "openability"). . It is known that the openability is improved as the remaining thickness of the sheet after score processing (score remaining thickness) is reduced. There is a limit from the viewpoint of maintaining the pressure resistance against the rise. In other words, too much priority on the openability,
If the remaining score is excessively reduced, the score may crack during processing, or the score may break due to an increase in thermal internal pressure or impulsive stress during transportation or storage. However, there is a danger that a problem such as leakage of contents occurs.

By the way, many attempts have been made to achieve both the strength and the openability of the cover.
For example, there are techniques disclosed in Japanese Patent Application Laid-Open Nos. 60-56052 and 62-80224. However, with these techniques, sufficient lid opening property has not yet been obtained. Further, in order to reduce the strength at the time of opening the cover and to improve the openability, a starting point of a void is generated in the steel sheet, and a technique considered so that a fracture crack is more easily developed is disclosed in, for example,
-116030, JP-A-2-200754 and the like.

[0004]

However, in these techniques, since S is added in an extremely large amount of 0.05 wt% or more, the steel becomes extremely brittle, and various cracks during continuous casting and various problems during hot rolling. This resulted in cracking and deterioration of the surface properties, and did not lead to practical use. In addition, as a technique for adding REM, Japanese Patent Application Laid-Open No. 62-93345 is cited, but this technique also has a similar problem. In addition, in these techniques, there is also an essential problem when using as a can material, that inclusions containing S become active sites for corrosion and significantly reduce corrosion resistance. Furthermore, Japanese Patent Application Laid-Open No. Sho 62-103341 discloses a technique for improving lid opening properties by dispersing BN in steel. However, this method still has insufficient lid opening properties, and further improvement is required.

[0005] One of the other factors that makes it difficult to apply these iron easy-open can lids according to the above-described technology is the rivet forming property when forming the lid (the rivet is a part for attaching a tab to the lid body). And forming a three-dimensional projection on the cover material by press working). This is because, as described above, if a large amount of nonmetallic inclusions are left in steel to improve the lid opening property, the lid opening property is improved, but the rivet formability of the steel sheet is significantly deteriorated. is there. When the rivet formability is deteriorated, tab attachment, which is an important forming process in easy open can lid forming, becomes difficult due to breakage of the steel plate. As an alternative technique to rivet molding, a method of attaching tabs using adhesive etc. has also been proposed, but there is still a problem of lack of reliability, and there are still problems such as large design constraints, and before adoption, Not reached.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an easy-open can lid steel plate (various platings, organic resins, etc.) which has excellent lid opening properties and excellent rivet forming properties. Coating and surface coating such as an organic resin film) and a method for producing the same. Another object of the present invention is to provide a can lid excellent in lid opening property manufactured using the above-mentioned steel plate for an easy-open can lid.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to solve the above-mentioned problems, and have pursued a preferable material as a steel plate for a can lid. In the process, it has become clear that the conventional technique of simply making a material brittle is difficult to finish to a uniform material itself and that the reliability after assembling as a can is insufficient. Was.
In addition, they have obtained a remarkable finding that the material needs to satisfy the following conditions in order to solve the above-mentioned problem while taking advantage of the excellent ductility of iron.

1) In order to improve the rivet formability of a steel sheet, it is effective to reduce C. 2) Add B in an amount of 0.01 wt% or more to reduce the particle size of the B precipitate to 0.1%.
By controlling the thickness in the range of 2020 μm, the lid opening property can be significantly improved without deterioration of rivet forming property. 3) It is necessary to control the contents of B and O within an appropriate range in order to achieve the above-mentioned effect 2). 4) At this time, by restricting the aluminum content to 0.01 wt% or less, the lid opening property is further improved. 5) Control of manufacturing conditions is also one of the important conditions. 6) The corrosion resistance of the steel sheet deteriorates when a large amount of Mn, S, etc. is added, but does not deteriorate when B and O are added in appropriate amounts.

The gist configuration of the present invention completed on the basis of the above findings is as follows. (1) C: 0.02 wt% or less, B: 0.010 to 0.020 wt%, Al:
An easy open can lid steel sheet having excellent lid opening properties and rivet forming properties, characterized by containing 0.010 wt% or less and O: 0.010 to 0.030 wt%.

(2) C: 0.02 wt% or less, Si: 0.05 wt% or less, Mn: 0.6 wt% or less, S: 0.020 wt% or less, B: 0.01
0 to 0.020 wt%, Al: 0.010 wt% or less, N: 0.02 wt% or less, O: 0.010 to 0.030 wt%, with the balance being composed of Fe and inevitable impurities. Steel sheet for easy open can lids that excels in formability and rivet formability.

(3) C: 0.02 wt% or less, Si: 0.05 wt% or less, Mn: 0.6 wt% or less, S: 0.020 wt% or less, B: 0.01
0 to 0.020 wt%, Al: 0.010 wt% or less, N: 0.02 wt% or less, O: 0.010 to 0.030 wt%, and Nb: 0.003 to 0.003 wt%
Easy open can with excellent lid openability and rivet formability, characterized in that it contains one or two kinds of 0.02 wt% and Ti: 0.003 to 0.02 wt%, and the balance is composed of Fe and inevitable impurities. Steel plate for lid.

(4) The steel according to the above (2) or (3), further comprising: Cu: 0.20 wt% or less, Ni: 0.20 wt% or less, Cr: 0.20 wt%
A steel sheet for an easy-open can lid having excellent lid opening properties and rivet forming properties, characterized by containing one or more kinds selected from wt% or less and Mo: 0.20 wt% or less.

(5) The B oxide has an average particle diameter of 0.1 to 20 μm, and has excellent lid opening properties and rivet forming properties as described in any one of (1) to (4) above. Steel plate for cans.

(6) The surface of any one of tin plating, chrome plating, nickel plating, organic resin coating, and organic resin film is coated on the surface of the steel sheet according to any one of the above (1) to (5). An easy-open can lid steel sheet with excellent lid opening and rivet forming properties.

(7) An easy-open can lid excellent in lid-opening property, characterized by being formed by processing the steel sheet according to any one of the above (1) to (6).

(8) C: 0.02% by weight or less, B: 0.010 to 0.02
0 wt%, Al: 0.010 wt% or less, O: 0.010 to 0.030 wt%
Is hot rolled at a finishing temperature of 800 ° C or higher, wound up in a temperature range of 450 to 700 ° C, subjected to primary cold rolling, recrystallized, and then reduced to a rolling reduction of 30% or less. Method of manufacturing steel plate for easy-open can lid having excellent openability and rivet formability, characterized by secondary cold rolling at room temperature

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. (1) Regarding steel components: C: 0.02 wt% or less If C is contained in excess of 0.02 wt%, the fraction of carbides present in the steel increases, resulting in deterioration of the ductility of the steel sheet. The lower limit is not particularly defined. However, when the C content is 0.0005 wt% or less, the crystal grains become coarse and the risk of occurrence of rough skin defects similar to the orange peel phenomenon increases. desirable. Therefore, C content is 0.02wt%
Hereinafter, it is preferably 0.0005 to 0.02 wt%, and when it is necessary to further enhance the stability and ductility of the material, 0.0015 to 0.015%.
A range of wt% is desirable. Further, from the viewpoint of further improving the workability, the content is desirably 0.01% by weight or less.

Si: 0.05 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 0.05 wt%.
In particular, when excellent corrosion resistance is required, the content is desirably 0.02% by weight or less.

Mn: 0.6 wt% or less Mn has an effect of preventing red hot embrittlement during hot rolling by S and of making crystal grains fine, and is an element necessary for securing a desired material. However, if added in excess of 0.6 wt%, the corrosion resistance deteriorates, and the steel sheet becomes harder, the cold rollability decreases, and the lid opening property decreases, so the content is set to 0.6 wt% or less. In addition,
For applications requiring better corrosion resistance and rivet formability, preferably 0.20 wt% or less, more preferably 0.15 wt%
% Or less.

S: 0.020 wt% or less S exists as nonmetallic inclusions such as MnS in steel and improves the lid opening property, but also causes rivet formability, deterioration of slab surface properties, and deterioration of corrosion resistance. Since it is a harmful element, it is limited to 0.020 wt% or less. When more emphasis is placed on rivet formability and corrosion resistance, it is desirable to limit the range to 0.015 wt% or less.

B: 0.010 to 0.020 wt% B is one of the extremely important additional elements in the present invention. Control the amount of O in the steel to an appropriate range and set B to 0.
By adding more than 01 wt%, B disperses in the steel in the form of oxides of appropriate dimensions. The B oxide is unlikely to form clusters unlike the aluminum oxide, grows to a size that is preferable for the purpose of the present invention, and exists in a uniformly dispersed state. In addition, since B oxide is a relatively stable compound, it does not deteriorate the corrosion resistance even when used as a lid material constituting a can. Further, B oxide is
This has a desirable effect as a material for a can lid, in that the work required for opening the lid is reduced at the time of use without causing cracking at the time of molding the can lid. Although the detailed mechanism by which such an effect is obtained is not always clear,
It is considered that when the particle size, the dispersion state, the fraction, and the like of the B oxide are in appropriate ranges, the rivet formability and the good breaking property (opening property), which are usually contradictory properties, are compatible. In any case, the B oxide has a completely different effect from the BN precipitate proposed in the prior art. As described above, by adding 0.010 wt% or more of B,
For the first time, a remarkable effect of improving formability represented by remarkable openability and rivet formability appears. However, if added in excess of 0.020 wt%, the rivet formability deteriorates due to remarkable embrittlement of the steel, so B is added in the range of 0.010 to 0.020 wt%.

Al: 0.010 wt% or less If the amount of Al increases, the surface properties deteriorate due to the formation of alumina clusters. Further, in the present invention, in order to improve the lid opening property, it is necessary to minimize the amount of alumina produced in the steel, and the Al content is 0.010 wt% or less. From the viewpoint of material stability, it is desirable to limit the content to 0.005 wt% or less.

N: 0.02 wt% or less N increases the amount of N to increase the strength of the steel sheet unnecessarily, and lowers the openability when used as a can lid. By limiting this adverse effect to 0.02 wt% or less, substantial adverse effects can be avoided. In order to achieve a further effect of improving the lid opening property, it is desirable to limit the content to 0.0080 wt% or less.

O: 0.010 to 0.030 wt% O is an important component together with B in the present invention. When the O content is 0.010% by weight or more, the effect of improving both the openability and the rivet formability is exhibited for the first time. This effect is believed to be due to the formation of a sufficient amount of oxide in the steel of a size effective to serve as a starting point for fracture. However, the content of O is 0.030 wt%
If it exceeds 300, it becomes difficult to produce a sound slab (including a thin slab) having no surface cracks or internal cracks in the steel making stage, and it is not suitable for use in a can material requiring a beautiful surface. If a higher level of surface texture is required, the range is preferably 0.025 wt% or less.

In addition to the above basic components, if necessary, Nb: 0.003 to 0.020 wt%, Ti: 0.003 to 0.020 wt%
One or more or two or more elements of the following: Cu: 0.20 wt% or less;
One or more or two or more elements of Ni: 0.20 wt% or less, Cr: 0.20 wt% or less, and Mo: 0.20 wt% or less can be added alone or in combination.

Nb: 0.003 to 0.020 wt% Nb is an element useful for refining the microstructure of a steel sheet. The fineness of the steel sheet structure enhances the toughness of the material, and improves the reliability against the impact load applied before use after easy open end processing. Such an effect is obtained from the addition of 0.003 wt% or more. However, even if added in excess of 0.020 wt%, these effects are saturated, and the recrystallization temperature is significantly increased, making annealing difficult. Therefore, the amount of Nb added is in the range of 0.003 to 0.020 wt%.

Ti: 0.003 to 0.020 wt% Ti contributes to the refinement of the microstructure of the steel sheet, similarly to Nb.
Further, Ti is also effective in controlling the form of inclusions, and improves the reliability against an impact load applied until the time of use after processing the easy-open can lid. In order to obtain such an effect, it is necessary to add 0.003 wt% or more. However, even if it is added in excess of 0.020 wt%, these effects are saturated, and the recrystallization temperature rises, making annealing difficult. Therefore, the content of Ti is set in the range of 0.003 to 0.020 wt%.

Cu: 0.20 wt% or less, Ni: 0.20 wt% or less, C
r: 0.20 wt% or less, Mo: 0.20 wt% or less Cu, Ni, Cr and Mo have the effect of minimizing ductility degradation, increasing strength, and improving corrosion resistance.
However, even if it is added in excess of 0.20 wt%, not only these effects are saturated, but also the strength becomes too high and the lid opening property is deteriorated. Therefore, Cu, Ni, Cr and Mo are:
All are added in a range of 0.20% by weight or less. The effect of adding these elements will not be offset by the combined addition,
From the viewpoint of ensuring openability, it is desirable that the total amount be 0.5 wt% or less. Further, it is desirable to add 0.01% by weight or more of each of these elements in order to obtain the effect of addition.

Average particle size of B oxide: 0.1 to 20 μm The average particle size of B oxide, that is, a precipitate represented by the composition of BxOy (x: ２2, y: ３3) is 0.1 to 20 μm. This is very important. In steel, besides this, carbide,
Precipitates such as sulfides and nitrides and their composites are present, but the precipitates that can improve the openability without lowering the ductility are B oxides that tend to be spherical and isolated. Things. A reduction in ductility due to other precipitates other than the B oxide can be minimized by applying the manufacturing conditions described below. If the average particle size of the oxide B is less than 0.1 μm, the steel sheet will be strengthened by the precipitates, and the improvement of the openability will be insufficient. On the other hand, when the average particle size exceeds 20 μm, the deterioration of the moldability becomes large, and the risk of causing problems such as press cracking in the process of forming the lid material increases. Therefore, the average particle size of the B oxide is 0.1 to 20 μm. In addition, in addition to B oxides, oxides such as Al ₂ O ₃ and MnO also exist in the steel. However, as long as these oxides are in the range of the production conditions of the present invention, the rivet formability, openness, etc. Does not significantly affect lid properties. The same applies to the case where these oxides are precipitated in combination. The above-mentioned knowledge on the precipitates in steel has been elucidated by confirmation with an optical microscope, observation and analysis of the residue collected by the electrolytic extraction method with a scanning electron microscope, and the like. Note that the size of the precipitate is not uniquely determined, and may vary depending on the survey method. The measuring method in the present invention is based on the following method. First, a sample having a weight of 50 g or more is collected from a steel sheet, and subjected to constant potential electrolysis. After that, a coagulation inhibitor is added to prevent agglomeration of the particles, and the mixture is filtered with a normal Nuclepore filter to extract a residue ( (Electrolysis extraction method)
. Next, the residue is observed as it is with a scanning electron microscope, and ordinary image processing (statistical processing) is performed to determine the average particle diameter.

(2) Manufacturing conditions: The slab is manufactured by a conventional method, but is preferably manufactured by a continuous casting method in order to prevent macro segregation of components. The continuously cast slab may be once cooled to room temperature and heated, or may be directly inserted into a heating furnace without cooling.

・ Hot rolling In the hot rolling following the slab heating, the finishing hot rolling temperature is set.
Must be at least 800 ° C. Finish hot rolling temperature 800 ℃
By doing as described above, a uniformly fine hot-rolled structure can be obtained, and the structure of the final product can be uniformly refined. However, when the finish rolling temperature exceeds 950 ° C., eaves due to scale are likely to be generated. Therefore, in the field of steel sheets for cans where surface soundness is strongly required, preferably 80 ° C.
It is preferable to perform finish rolling in the range of 0 to 950 ° C. When importance is placed on the uniformity of the material, it is desirable to further perform finish rolling in a temperature range of 850 to 920 ° C.

Winding after hot rolling The winding temperature must be 450 to 700 ° C. This winding temperature is usually set to 700 ° C. for general formability improvement.
However, if the film is wound up in such a temperature range, the openability after being formed into a can lid deteriorates. Further, the non-uniformity of the material in the longitudinal direction and the width direction of the coil also increases. According to the investigation by the inventors, it has been found that if the winding temperature is 450 to 700 ° C., it is possible to prevent such deterioration of the formability and to improve the lid opening property. If it is necessary to further improve the openability of the cover, it is desirable to wind it up in the range of 500 to 650 ° C.

Pickling and primary cold rolling Pickling does not require special restrictions.
From the standpoint of pickling efficiency, pickling with ordinary hydrochloric acid is recommended, but pickling with sulfuric acid does not cause any material problems. Also, the primary cold rolling is not particularly required to be carried out, but is preferably performed in a normally applied rolling reduction range of 70% or more.

Annealing In order to stabilize the formation of the lid material, it is essential to anneal at a temperature higher than the recrystallization temperature. Although the upper limit temperature is not particularly defined, it is preferable that the annealing is performed in the range of approximately 850 ° C. or less in the component steel of the present invention.

[Second Cold Rolling] The rolling reduction of the second cold rolling is performed within a range of 30% or less. This secondary cold rolling includes light rolling (generally 0.8 to 2.0%) usually called skin pass rolling. The role of skin pass rolling is
The main purpose is to provide more uniform deformation when forming the can lid. The role of secondary cold rolling at a higher reduction rate is to increase the strength of the can lid by strengthening the work. To make it happen. However, if the rolling reduction exceeds 30%, the ductility of the material is reduced, and the risk of forming defects increases. Therefore, the secondary cold rolling is performed according to the purpose within a rolling reduction range of 30% or less.

The steel plate manufactured as described above is subjected to tin plating, Ni plating, chromium plating with an emphasis on the adhesion of the organic resin film, etc. on the surface to improve the corrosion resistance, and is applied to the can lid. Provided. Further, instead of the organic resin coating, an organic resin film obtained by heat-sealing (including one using an adhesive together) can be similarly applied to the can lid.

[0037]

EXAMPLES Example 1 Steel slabs of various components shown in Table 1 were melted, and steel plates for can lids were manufactured under the following conditions. Slab heating temperature: 1250 ° C Finish rolling temperature: 850 ° C Finish thickness: 2.0 mm Winding temperature: 620 ° C Primary cold reduction: 90% Purification: continuous calcination, 750 ° C-20 sec, no overaging Cold rolling reduction: 1.5% skin pass 25 # tin (2.8 g / m ^{2 with} tinned area) Using this steel plate, oval-shaped Persian easy open can lid (length 40mm, radius 10mmφ ~ 20mmφ, score remaining thickness
45 μm), and the rivet formability, lid openability, and appearance after closure were observed. Table 2 shows the results of these investigations. Here, the rivet formability was determined by the presence or absence of cracking when a normal tab was attached and formed into a shape of 5 mmφ and 1 mm height. Further, the pop value, the tier value, and the detach value were obtained from a load-displacement relationship (n = 20) by applying a tensile load using a tensile tester. Pop value: force required to generate an initial crack by raising a tab (kgf) Tear value: force required to continue shear failure stably at the score part (kgf) Detach value: cover part from can body Force required to separate (kgf)

[0038]

[Table 1]

[0039]

[Table 2]

From these examples, it is clear that by applying the present invention, the openability represented by the pop value and the tier value is remarkably improved, and the rivet formability is also improved. In particular, it can be seen that the example of the present invention has an excellent lid opening property as compared with No. 7 in which BN is the main precipitate.

Example 2 Using a steel slab of No. 1 in Table 1 as a raw material, a steel plate for a can lid was produced under various conditions shown in Table 3 up to surface coating.
A similar survey was conducted. Table 4 shows the results. It is clear that if the production conditions according to the present invention are satisfied, a steel plate for a can lid and a can lid excellent in rivet formability and lid openability can be produced.

[0042]

[Table 3]

[0043]

[Table 4]

Using a No. 2 steel plate, a three-piece can was manufactured with a lid having a residual thickness of 40 μm. The can was filled with water and heated to generate an internal pressure of about 2 bar, and its pressure resistance was evaluated. As a result, it was confirmed that it had a pressure resistance equal to or higher than that of a conventional low carbon aluminum killed steel continuous annealed material. Also, place the prepared sample can on a concrete surface for 1.5
After dropping from a height of m, the impact resistance characteristics of the score portion were investigated. As a result, it was confirmed that the score portion of the can lid manufactured from the steel sheet of the present invention had impact resistance equal to or higher than that of the conventional low carbon aluminum killed steel continuously annealed material. That is, according to the present invention, the rivet forming property and the lid opening property are both remarkable while having pressure resistance and impact resistance to the contents, which are equal to or higher than those of the conventional low carbon aluminum killed steel continuous annealing material. It was found that it could be improved.

0.010 wt% C-0.01 wt% Si-0.15 wt% Mn-
Based on 0.010 wt% S-0.005 wt% Al-0.0030 wt% N steel, the O content is controlled to 0.0150 wt%, B is varied widely, and the can lid is manufactured and opened in the same manner. The lid property ((pop value + tear value) / 2) and the incidence of cracking during rivet forming of the can lid were investigated (n = 30). The result is shown in FIG. From FIG. 1, it can be seen that the initial problem can be achieved by controlling the B and O contents in appropriate ranges.

[0046]

As described above, according to the present invention, when the iron material is applied in place of the can lid material which has been conventionally made of aluminum material in many cases, the problem of the openability has been a problem of the iron material. It is expected to be used as an easy-open can lid that is inexpensive and easy to recycle because the rivet formability can be greatly improved. Moreover, according to the present invention, it is possible to provide an easy-open can lid that has excellent pressure resistance, good corrosion resistance and impact resistance in addition to the above-mentioned characteristics.

[Brief description of the drawings]

FIG. 1 is a diagram showing the effect of the B content on the openability and rivet formability.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masatoshi Araya 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Inside the Technical Research Institute of Kawasaki Steel Co., Ltd. (72) Inventor Makoto Aratani 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Prefecture Kawasaki Steel Corporation Chiba Works

Claims (8)

[Claims] 1. C: 0.02% by weight or less, B: 0.010 to 0.020
An easy open can lid steel sheet having excellent openability and rivet formability, characterized by containing wt%, Al: 0.010 wt% or less, and O: 0.010 to 0.030 wt%. 2. C: 0.02% by weight or less, Si: 0.05% by weight or less,
Mn: 0.6 wt% or less, S: 0.020 wt% or less, B: 0.010-
0.020 wt%, Al: 0.010 wt% or less, N: 0.02 wt% or less,
O: A steel sheet for an easy-open can lid having excellent openability and rivet formability, comprising 0.010 to 0.030 wt%, with the balance being composed of Fe and inevitable impurities. C: 0.02% by weight or less, Si: 0.05% by weight or less,
Mn: 0.6 wt% or less, S: 0.020 wt% or less, B: 0.010-
0.020 wt%, Al: 0.010 wt% or less, N: 0.02 wt% or less,
O: 0.010 to 0.030 wt%, and Nb: 0.003 to 0.02
Easy open can lid excellent in openability and rivet formability, characterized in that it contains one or two kinds of wt%, Ti: 0.003 to 0.02 wt%, and the balance is composed of Fe and inevitable impurities. For steel plate. 4. The steel according to claim 2, further comprising Cu: 0.20 wt% or less, Ni: 0.20 wt% or less, Cr: 0.20 wt%.
% Or less, Mo: 0.20 wt% or less, characterized by containing one or more kinds selected from the group consisting of: 5. The steel sheet for cans according to claim 1, wherein the B oxide has an average particle diameter of 0.1 to 20 μm. 6. The steel sheet according to claim 1, wherein a surface coating of any one of tin plating, chromium plating, nickel plating, organic resin coating, and organic resin film is formed. A characteristic steel plate for easy-open can lids that features excellent openability and rivet formability. 7. An easy-open can lid excellent in lid-opening properties, characterized by being formed by processing the steel sheet according to any one of claims 1 to 6. 8. C: 0.02% by weight or less, B: 0.010 to 0.020
A steel slab containing wt%, Al: 0.010 wt% or less, and O: 0.010 to 0.030 wt% is hot-rolled at a finishing temperature of 800 ° C or more, and then wound up in a temperature range of 450 to 700 ° C, and then subjected to primary cooling. A method for producing a steel sheet for an easy-open can lid having excellent openability and rivet formability, comprising performing recrystallization annealing after cold rolling, and then performing secondary cold rolling at a rolling reduction of 30% or less.