JP2003277886A - Resin-coated steel sheet for shear spun can, method of producing resin-coated steel sheet for shear spun can and shear spun can produced by using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin-coated steel sheet which is obtained by coating both sides of a steel sheet with a resin film, and has excellent working adhesion for the resin film and excellent preventability in the occurrence of hair in the forming of a shear spun can, to provide the shear spun can which is obtained by using the steel sheet, and has excellent corrosion resistance to contents, and to provide a production method of the resin-coated steel sheet. <P>SOLUTION: The steel components and material of a steel sheet used as an original sheet are controlled, and the face orientations in the crystal faces are controlled. Thus, a steel sheet thinner than the conventional one is used, and the increase of the thickness of the steel sheet in the upper end part of the can wall on drawing is suppressed, and the substantial ironing quantity in an ironing stage as the main stage where hair occurs is reduced. Simultaneously with this, the working hardening of the steel sheet in the process of the working is suppressed, and the increase of the deformation resistance thereof is reduced. Further, a thinned layer subjected to molten tin treatment in a fixed amount is formed on the surface of the steel sheet, and the surface thereof is coated with a non-oriented polyester resin film. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-coated steel sheet for drawing and ironing cans having resin coatings on both sides, a drawing and ironing can formed by using the same, and a method for producing a resin-coated steel sheet for drawing and ironing cans. More specifically, in the drawing step and the ironing step, the resin-coated steel sheet and the resin-coated steel sheet which have excellent workability and have excellent processing adhesion even after the drawing and ironing process and which hardly cause hairs are used. The present invention relates to a drawn ironing can having excellent corrosion resistance against a formed corrosive content and a method for producing a resin-coated steel sheet for a drawn ironing can.

[0002]

2. Description of the Related Art A drawn and ironed can is made by first punching a blank from a steel plate, forming the blank into a cup by one or more drawing steps, and then mounting the cup on a punch for ironing and The thickness of the cup side wall is reduced by passing through a step or a plurality of steps of ironing dies, and a predetermined can height is obtained. The cans after molding are painted for corrosion resistance and appearance retention, but since the use of organic solvents is involved in the painting, from the viewpoint of environmental protection in recent years,
A resin-coated steel plate obtained by coating a steel plate with a biaxially stretched polyester resin film is mainly used for beverage cans.

When forming an ironing can from a resin-coated steel sheet, there is also a problem that a resin film at the edge of the can, which is called hair, is cut into hair. This hair is generated by applying a large pressure to the edge portion of the can with a squeezing or ironing tool, so that the soft resin film on the edge portion is cut into hair like the edge of the can. When the hair accumulates in the processed parts such as punches and dies, it causes breakage of the work and breakage of the surface coating layer, and the tools used tend to be worn or damaged. Also, if it adheres to the can, it will cause a quality defect, so
In the processing of resin-coated steel sheet, hair is a big problem.

Japanese Patent No. 2513379 discloses a drawing method which does not generate hair during drawing can forming using a resin-coated steel sheet.
It is disclosed in the publication. Japanese Patent No. 2513379 discloses that, in the draw forming of a resin-coated steel sheet, a wrinkle suppressing force is a constant load in a draw forming apparatus that is normally used commercially, and an annular holding is performed at a stage immediately before the end of the draw forming. The area of the residual flange portion in contact with the member (wrinkle suppression) and the drawing die is drastically reduced, and accordingly, the pressure applied to the residual flange portion is abnormally increased, so that hair is likely to occur. Therefore, in order to make harmless the pressing force of the flange portion immediately before the end of the drawing process, which causes hair to be generated, the annular holding member (wrinkle suppressing) and the die are formed at 65 to 98% of the effective drawing stroke length. A draw forming method is disclosed in which the distance is made wider than the plate thickness of the material to be processed, and thereby the rear end of the flange portion is opened and narrowed to prevent hair from being generated.

However, in the case where the flange-free drawn cup having suppressed hair generation in this way is further subjected to ironing processing in which the thickness of the can wall is reduced by several ironing dies, hair generation occurs. Cannot be suppressed. This is because in the ironing process, a cup without a flange after drawing is subjected to a large pressure by several stages of ironing dies to reduce the thickness of the can wall, so it is inevitable that a large pressure is applied to the cup edge. This is because hair is likely to occur. Further, the present invention mainly aims at suppressing the generation of hair by focusing on the drawing method.

As a steel sheet for coating a polyester resin film, mainly from the viewpoint of work adhesion, a layer consisting of two layers, a lower metallic chromium layer and an upper chromium hydrated oxide layer, is formed on the steel sheet. Electrolytic chromic acid treated steel sheets (also called tin-free steel or TFS) have been frequently used. However, a two-piece can in which a polyester resin film is coated on TFS, and the body and bottom are integrally formed by drawing or drawing and ironing, the resin film covered by the impact such as dropping after filling the contents has defects. If it occurs, it may corrode depending on the contents.

Therefore, it has been attempted to use a tin-plated steel sheet having excellent corrosion resistance for highly corrosive contents as a coating base for the resin film. Japanese Patent Publication 61-
Japanese Patent No. 3676 discloses a method in which a tin-plated steel sheet is heated to a temperature equal to or lower than the melting point of tin, a polyester resin film is contacted and pressed to temporarily bond, and then heated to a temperature equal to or higher than the melting point of tin to perform a final bonding. ing. The resin-coated plated steel sheet obtained by this method has a poorer processing adhesion of the resin film than the resin-coated steel sheet having TFS as a coating base, and the resin film is peeled off when the drawing process or the drawing and ironing process is performed. Cannot be formed into a coated can.

In Japanese Patent Laid-Open No. 5-98465, a steel sheet is tin-plated or a small amount of Ni-plated and then heated to a temperature equal to or higher than the melting point of tin to form a thermoplastic resin film in a molten state of tin. Disclosed is a method of immediately quenching after pressure lamination. According to this method, the tin is brought into contact with the thermoplastic resin film in a molten state, the oxide film formed on the surface of the tin during pressure lamination is destroyed, and the active metal tin is brought into direct contact with the thermoplastic resin film. It is said that excellent processing adhesion can be obtained. However, according to this method, the resin-coated plated steel sheet immediately after being laminated with the thermoplastic resin film exhibits excellent work adhesion, but the work adhesion tends to decrease with time.

[0009]

DISCLOSURE OF THE INVENTION The present invention solves the drawbacks of the prior art, and in the forming process of a drawn and ironed can made of a resin-coated steel sheet in which a polyester resin film is coated on both surfaces of a surface-treated steel sheet, Practical resin-coated steel sheet that has excellent properties and excellent processing adhesion of resin film, and that can prevent hair from occurring, and a drawn ironing can formed by using the same and excellent corrosion resistance, and a resin-coated steel sheet for drawn ironing can It is an object to provide a manufacturing method of

[0010]

The resin-coated steel sheet of the present invention is a resin-coated steel sheet for a squeezing and ironing can in which the can bottom and the can wall are integrated, and C: 0.003% by weight or less, Mn: 0.
05 to 0.30% by weight, Si: 0.03% by weight or less,
P: Includes steel components of 0.02% or less and yield strength is 400
~ 600 N / mm ² , and a total elongation of 30% or less, on both sides of the steel sheet, a tin-plated layer treated with molten tin, which is formed with a tin amount of 0.1-8.4 g / m ² , is formed on both sides. A resin-coated steel plate for a drawn and ironed can, which is coated with an unstretched polyester resin film, and has X-ray diffraction peak intensities P20 of crystal planes (200) and (222) parallel to the plate surface of the steel plate.
0, P222 surface strength ratio P ₂₂₂ × 100 / P
The value of ₂₀₀ is 50 or more. Also,
The steel plate has a thickness of 1.1 to the steel plate thickness at the upper end of the can wall.
It is desirable that the thickness is in the range of 1.4 times, and the steel plate thickness at the upper end of the can wall is 0.13 to 0.17 mm. The method for producing a resin-coated steel sheet for a drawn and ironed can of the present invention is a resin-coated steel sheet for a drawn and ironed can in which a can bottom and a can wall are integrated, and C: 0.003% by weight or less, Mn: 0.05 to.
0.30% by weight, Si: 0.03% by weight or less, P: 0.
A crystal plane (20% or less) containing steel components parallel to the plate surface
0), (222) X-ray diffraction peak intensities P ₂₀₀ , P
_{In 222} , the value of the surface strength ratio P ₂₂₂ × 100 / P ₂₀₀ is 50 or more, the yield strength is 400 to 600 N / mm ² ,
Both sides of a steel sheet having a total elongation of 30% or less are 0.
After tin-plating in an amount of 1 to 8.4 g / m ² and treating it with molten tin by heating it to a temperature above the melting point of tin, contact an unstretched polyester resin film on both sides and apply a pair of This is a method for producing a resin-coated steel sheet, which is sandwiched by pressure rolls and pressure-bonded, and it is desirable that the unstretched polyester resin film is pressure-bonded by heating the steel sheet to a temperature not higher than the melting point of tin. Further, the squeezed ironing can of the present invention is characterized by being formed using any of the above resin-coated steel plates.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a resin-coated steel sheet for drawn and ironed cans has excellent ironing workability,
In order to prevent hair generation during drawing and ironing, we have conducted extensive research from the perspective of the material and properties of the steel sheet and the resin film, and also have excellent corrosion resistance when used as a material for cans and the processing adhesion of the resin film. The inventors have made extensive studies with the aim of obtaining a practical resin-coated steel sheet having excellent properties. As a result, in forming a drawn and ironed can using a resin-coated steel sheet, hair is generated particularly during ironing, and is more likely to occur when the ironing rate is high and the deformation resistance of the steel sheet is high. To reduce the actual ironing rate during ironing by suppressing the increase in the can wall thickness during drawing, and to soften the steel sheet material and reduce the degree of work hardening. By reducing the deformation resistance, reducing the pressure applied to the cup edge during ironing is effective for reducing hair generation, and by using such a steel plate,
We have found that it is also possible to prevent hair during drawing.
Further, it was found that it is important for the surface resin film to have ductility and strength to withstand drawing and ironing, and to have good adhesion to the steel sheet. Furthermore, from the aspect of corrosion resistance against strongly corrosive acidic beverages, etc., form a tin-plated layer with a certain amount of molten tin on the surface of the steel sheet, and make a resin-coated steel sheet by laminating a non-stretched resin film on it. As a result, it was found that the above-mentioned object can be achieved.

In the present invention, in order to soften the material of the steel sheet, C: 0.0030% by weight or less, Mn: 0.05-
0.30% by weight, Si: 0.03% by weight or less, P: 0.
It was set to 02% by weight or less. Here, C is an element that hardens steel, and when it increases, it hardens and the deformation resistance increases, so 0.003% by weight was made the upper limit. On the other hand, if the C content is too low, the necessary pressure resistance of the can bottom will not be obtained, and the crystal grains will become extremely large, and during processing, it will easily break through rough skin, so 0.0005 wt%
Is preferably the lower limit. Mn is also an element that hardens the steel, and in order to reduce the deformation resistance, it is 0.30% by weight.
Was set as the upper limit. The lower limit was set to 0.05% by weight in order to prevent hot brittleness due to S existing in steel. Moreover, since Si and P are also elements that harden the steel,
The respective upper limits were 0.03% by weight and 0.02% by weight.

However, a steel having a reduced hardening element is formed into a hot-rolled steel sheet by an ordinary method, and a cold-rolled and annealed temper-rolled steel sheet cannot obtain the pressure resistance required for a can bottom. Then, by subjecting to re-rolling, the yield strength is 40
A steel sheet having 0 to 600 N / mm ² and a total elongation of 30% or less, a required can bottom pressure resistance strength, a small work hardening and a low deformation resistance was obtained. Here, the yield strength is 400 N /
mm ² is a lower limit value for ensuring the required can bottom pressure resistance strength, and if the yield strength is too high, wrinkles are likely to occur during can bottom molding, so the upper limit was made 600 N / mm ² or more. In addition, when the elongation is large, the work hardening index tends to increase accordingly, and the degree of work hardening during drawing and ironing increases and the deformation resistance increases.
Below.

Next, in the present invention, the steel composition of the steel sheet and the
Not only the yield strength is within the above range, but also the plastic anisotropy of the steel plate
And focus on the degree of crystal orientation, which is said to affect the crystallinity
I went. Here, as an index of crystal orientation,
The X-ray diffraction peak intensity of the crystal plane parallel to the plane was used. That
As a result, X of crystal planes (200) and (222) parallel to the plate surface
Line diffraction peak intensity P₂₀₀, P₂₂₂At surface strength ratio
P₂₂₂× 100 / P ₂₀₀Value of 50 or more
Suppresses the increase in the thickness of the steel plate on the can wall during drawing,
We found that the actual ironing rate during milling can be reduced.
It was This X-ray diffraction peak strength value is determined by the steel composition and hot rolling.
Finish rolling temperature, winding temperature, primary and secondary cold rolling
Rate, recrystallization heat treatment conditions, etc.
Conditions are required for drawing and ironing processing conditions and drawing and ironing cans.
Select in consideration of characteristics.

By using a steel sheet having the above-mentioned materials and characteristics, the steel sheet thickness at the upper end of the can wall is 0.13 to
As a steel plate for a 0.17 mm drawing and ironing can, the thickness of the steel plate before processing is 1.1 to 1.4 times the thickness of the upper end of the can wall, which is thinner than the thickness of a conventional drawing and ironing steel plate. In this case, the cost can be reduced in addition to the reduction of the ironing rate. Further, the steel sheet is subjected to a surface treatment in order to enhance the adhesion with the resin film to be coated. There are various surface treatments such as electrolytic chromic acid treatment and tin plating, but tin plating is applied to provide excellent corrosion resistance. It may be one in which a Ni plating layer and a tin plating layer are sequentially formed on the surface of the steel sheet.

The tin-plated layer has a characteristic that it can prevent corrosion of steel as a substrate metal due to its electrochemical characteristics, but on the other hand, a tin oxide layer is easily formed on the surface, and this tin oxide layer is Has a weak cohesive force, is easily broken, and has a drawback that the adhesive force with the resin layer is insufficient. According to the present invention, the tin-plated amount of the tin-plated steel sheet is limited and molten tin treatment is performed, preferably a post-treatment layer is provided by a known method such as a sodium dichromate treatment solution,
By laminating a non-stretched resin film thereon at a temperature equal to or lower than the melting point of tin, the adhesion with the resin film layer is maintained at an excellent level. The reason for this is not clear, but the fact that the unstretched resin film has excellent adhesion, and that the tin plating amount is limited and the tin surface treatment is performed to reduce the tin surface area is the formation of the tin oxide film. The oxide film formed on the tin surface is destroyed when subjected to strong processing such as drawing and ironing, and the active metal tin surface comes into direct contact with the resin film, making it suitable for heat treatment after ironing. It seems that the adhesive strength improves again.

When a tin plating layer is formed on the surface of the steel sheet, a plating bath such as a well-known ferrostane bath or halogen bath used for the production of tinplate is used, and 0.1 to 8.4 g / m ² is used.
To plate. If the plating amount is less than 0.1 g / m ² , sufficient corrosion resistance cannot be obtained, and if it exceeds 8.4 g / m ² , the effect of improving corrosion resistance is saturated and sufficient processing adhesion with the resin film cannot be obtained. In order to effectively use expensive tin, it is also effective to perform differential thickness plating in which the amount of plating on the side corresponding to the inner surface of the can requiring corrosion resistance is increased. When it is desired to further increase the corrosion resistance with a small amount of tin, a trace amount of nickel may be plated on the tin underlayer using a known Watt bath or sulfamic acid bath. When Ni plating is applied, the amount of nickel is preferably in the range of 0.001 to 3 g / m ² . If it is less than 0.001 g / m ² , there is no problem, but the effect on corrosion resistance is small. Although it may exceed 3 g / m ² , it is not preferable because the manufacturing cost becomes high.

As described above, after forming only the tin plating layer or the Ni plating layer and the tin plating layer on the surface of the steel sheet,
Molten tin treatment is performed by heating the plated steel sheet to a temperature equal to or higher than the melting point of tin.
By performing the molten tin treatment, an alloy layer is formed between the steel plate and the plating layer, and the corrosion resistance is improved. N under the tin layer
When the i-plated layer is formed, the alloy layer is densified and further excellent corrosion resistance is obtained.

A post-treatment coating layer is preferably formed on the plated layer of the plated steel sheet obtained as described above. As the post-treatment, known chemical conversion treatments such as chromic acid treatment and phosphate treatment can be applied, but electrolytic treatment with an aqueous solution of sodium dichromate is preferably used. As described above, a plated steel sheet that serves as a coating base for laminating resin films is obtained.

The resin film applicable to the present invention may be either a single layer film or a multilayer film having two or more layers, and is preferably a film made of a thermoplastic resin, particularly a polyester resin. As the polyester resin, those having an ester unit such as ethylene terephthalate, ethylene isophthalate, butylene terephthalate, butylene isophthalate are preferable, and at least one type of ester unit selected from these is mainly used as the polyester resin. Is preferred. At this time, each ester unit may be copolymerized, and a homopolymer or copolymer of two or more kinds of ester units may be blended and used. Other than the above, as the acid component of the ester unit, those using naphthalene dicarboxylic acid, adipic acid, sebacic acid, trimellitic acid, etc., also as the alcohol component of the ester unit, propylene glycol, diethylene glycol, neopentyl glycol, You may use what used cyclohexane dimethanol, pentaerythritol, etc. The polyester may be a homopolyester or a copolyester, or a laminate of two or more polyester layers made of a blend of two or more thereof. For example, the lower layer of the polyester film can be a copolyester layer having excellent thermal adhesiveness, and the upper layer thereof can be a polyester layer or a modified polyester layer having excellent strength, heat resistance, and barrier properties against corrosive components.

In the present invention, it is premised that a film made of an unstretched polyester resin is used, and the resin is cut off in the work of laminating the polyester resin film on the surface-treated steel sheet, or the surface-treated steel sheet laminated with the polyester resin film is used. Even if severe forming processing such as drawing and drawing and ironing is performed, the resin is not scraped or scratched, and cracks or cracks occur,
Further, in order to prevent peeling, it is necessary to increase the intrinsic viscosity of the resin and strengthen the resin. For this reason,
The intrinsic viscosity of the above polyester resin is preferably in the range of 0.6 to 1.4, more preferably in the range of 0.8 to 1.2. When a polyester resin having an intrinsic viscosity of less than 0.6 is used, the strength of the resin is extremely reduced, and it cannot be applied to a can formed by drawing or drawing and ironing. On the other hand, when the intrinsic viscosity of the resin exceeds 1.4, the melt viscosity when the resin is heated and melted becomes extremely high, and it becomes extremely difficult to laminate the polyester resin film on the surface-treated steel sheet.

The thickness of the resin film is preferably 5 to 60 μm in the case of a single layer film, and 10 to 40 μm.
Is more preferable. When the thickness is less than 5 μm, the work of laminating it on the surface-treated steel sheet becomes extremely difficult, and the resin layer after drawing or drawing and ironing tends to have defects, and it is molded into a can to fill the contents. In doing so, the permeation resistance to the corrosive components is not sufficient. When the thickness is increased, the permeation resistance is sufficient, but the thickness exceeding 60 μm is economically disadvantageous. In the case of a multilayer film, the ratio of the thickness of each layer varies from the viewpoints of molding processability, permeation resistance, and the influence on the flavor of the contents, but the total thickness is 5 to 60 μm. Adjust the thickness of. Further, when the resin film is formed into a film, the resin may contain a color pigment, a stabilizer, an antioxidant, a lubricant and the like within a range that does not impair the required properties, and the film may be formed.

The unstretched resin film is formed into a film as follows. That is, using an extruder, resin pellets are heated and melted at a temperature 20 to 40 ° C. higher than the melting temperature of the resin, and the molten resin is extruded from a T die onto a casting roll that has been cooled into a film, and the unstretched resin is stretched without stretching. Take it up as a film on a coiler.

In laminating the film-formed resin film on the surface-treated steel sheet, first, the long strip-shaped surface-treated steel sheet wound into a coil is unwound and continuously heated. The heating temperature is not less than the melting point of tin that is the plating layer and not less than the melting temperature of the resin film (in the case of a multi-layer film, the resin layer in contact with the plated steel sheet, the same below), not less than the melting point of tin and less than the melting temperature of the resin film. The temperature may be any temperature lower than the melting point of tin and higher than the melting temperature of the resin film, lower than the melting point of tin and lower than the melting temperature of the resin film, but from the viewpoint of processing adhesion, it is lower than the melting point of tin and lower than that of the resin film. It is preferable to heat to a range above the melting temperature. However, since the unstretched film adheres to the plated steel sheet even at a temperature below the melting temperature of the resin film, the resin film can be laminated on the plated steel sheet even if heated below the melting point of tin and below the melting temperature of the resin film. . A preferable temperature is 100 to 232 ° C, and a more preferable temperature is 150.
~ 220 ° C. Then, the above-mentioned resin film is brought into contact with one or both surfaces of the surface-treated steel sheet which is heated to the above temperature range and is continuously moved, and the both are sandwiched by a pair of pressure rolls and pressure-bonded, followed by immediate quenching. To do. The resin-coated steel sheet of the present invention is obtained as described above.

A can using the resin-coated steel sheet of the present invention is formed into a can as follows. That is, a circular blank is punched out from a resin-coated steel sheet, then drawn in one to several steps, and then ironed in one to several steps to integrally form the bottom and body, reducing the thickness of the side wall of the can. Mold into cans with a higher rate. During molding into this can, the resin film layer of the can body is given a uniaxial orientation along with the plastic flow in the can axis direction of the resin-coated steel sheet, and when performing ironing, the same surface as rolling is applied. Orientation is imparted, and these molecular orientations serve to improve heat resistance and mechanical strength.

[0026]

The present invention will be further described with reference to Examples.
Steels having the components shown in Table 1 were melted in a converter, hot-rolled by a conventional method, finish-rolled at 900 ° C, and rolled at 600 ° C to obtain hot-rolled steel sheets. The hot-rolled steel sheet is pickled, and
After cold rolling to a thickness of 22 to 0.28 mm, soaking temperature 70
Recrystallization annealing was performed under the conditions of 0 ° C. × soaking time of 60 seconds, and secondary cold rolling was performed at the secondary cold rolling rate shown in Table 2 to 0.20.
The plate thickness was mm. The yield strength after the secondary cold rolling shows the average value in the direction parallel to the rolling direction and the direction perpendicular to the rolling direction. After the secondary cold rolling, degreasing and formation of the tin plating layer shown in Table 1 were performed, and the molten tin treatment was performed by heating above the melting point of tin, and then the plated surface of these plated steel sheets was subjected to a dichromic acid solution. To form a chromate-treated layer (the amount of coating was 10 mg / m ^{2 of} chromium deposited as chromium). Then, on the surface that will be the outer surface side when formed into a can, a titanium oxide-based white film is formed on a copolyester resin (intrinsic viscosity: 0.8) consisting of ethylene terephthalate (88 mol%) and ethylene isophthalate (12 mol%). 20% pigment
An unstretched or biaxially stretched film having a thickness of 15 μm, which is contained, is composed of ethylene terephthalate (88 mol%) and ethylene isophthalate (12 mol%) on the inner surface when formed into a can. Non-stretched or biaxially stretched transparent copolymerized polyester resin films were respectively brought into contact with each other, sandwiched between a pair of pressure rolls and pressure-bonded, immediately immersed in water and rapidly cooled to obtain a polyester resin film-coated steel sheet. The drawing and ironing of the obtained resin-coated steel sheet can be wet or dry, but in the present embodiment,
Drying was performed, wax was applied to the surface of the obtained resin-coated steel plate, and the product was subjected to squeezing and ironing.

In the squeezing and ironing process, a blank with a diameter of 150 mm is punched out from the resin-coated steel sheet prepared as described above, and then the surface with the white-colored film laminated is the outside of the container and the diameter of 90 mm. Drawing process of drawing with a punch (drawing ratio 1.67), then 66 m in diameter
Redrawing process (drawing ratio 1.3
It carried out according to 6). The cup diameter of this cup was 66 mm by using an ironing and forming device consisting of a three-stage ironing die.
A drawn and ironed can having a thickness of 0.15 mm at the upper end of the can wall was formed and processed. Then, trim the upper end to a height of 12
After making it 2 mm and heat-treating at 215 ° C. for 30 seconds, the diameter of the upper end was reduced to 57 mm at the opening end. Next, the open end was bulged toward the outside of the can to form a flange so that the diameter of the flange was 62 mm, and the final shape of the can before filling with the contents was obtained.

[0028]

[Table 1]

[0029]

[Table 2]

As described above, the yield strength of the steel sheet, the elongation of the steel sheet, the surface strength ratio of the steel sheet, the formability of the drawn and ironed can and the hair generation state of the drawn and ironed can were evaluated as follows:
The results are shown in Tables 2 and 3. [Yield Strength of Steel Sheet] and [Elongation of Steel Sheet] The yield strength and elongation of the steel sheet were measured by a JIS No. 5 test piece prepared from the steel sheet before surface treatment with a tensile tester. [Surface strength ratio] Crystal plane (20) of the steel sheet before surface treatment
0) and (222) X-ray diffraction peak intensities P ₂₀₀ and P
₂₂₂ was measured and the strength ratio P ₂₂₂ × 100 / P ₂₀₀ was evaluated as the surface strength ratio. [Moldability] Visually inspect the can after drawing and ironing,
The formability of the resin-coated steel sheet was evaluated by three grades of "○ (formable)", "Δ (scraping of resin film)", and "x (breaking)". In addition, in the evaluation result of three stages, the level that can be practically used is only “◯ (moldable)”. [Hair generation status] Visually inspect the hair generation status in cans and tools after squeezing and ironing, and select "○ (no hair)", "△ (fine hair)", and "x (hair generation)".
The grade was evaluated. In addition, in the evaluation result of three stages, up to “Δ (fine hair)” is a practically usable level. [Processing adhesion] Squeeze ironing and flange forming cans are visually inspected, and "○ (no film peeling)", "△
(Flanged portion film peeling is extremely small) "and" x (Flanged portion film peeled) "were evaluated in three stages. In addition,
In the evaluation result of three stages, up to “Δ (extreme film peeling of the flange processed portion)” is at a practically usable level. The results are shown in Table 3.

[0031]

[Table 3]

As shown in Table 3, the resin-coated steel sheet of the present invention has a low deformation resistance and an excellent work adhesion of the resin coating. A draw ironing can made of a resin-coated steel sheet that was extremely difficult to form due to occurrence can be reliably formed, and a draw ironing can formed using the resin-coated steel sheet of the present invention is However, it has excellent corrosion resistance.

[0033]

Industrial Applicability According to the present invention, when forming an ironing can from a resin-coated steel sheet, the steel composition and the material of the steel sheet to be the original sheet are adjusted, and further the crystallographic plane orientation is adjusted. Using a thin steel plate, it suppresses the increase in the thickness of the steel plate at the top of the can wall during drawing, reduces the substantial amount of ironing in the ironing process, which is the main hair generation process, and suppresses work hardening during processing to transform it. It prevents the increase of resistance. In addition, in order to achieve both corrosion resistance to the contents and excellent processing adhesion, a tin-plated layer with molten tin treatment is formed on the steel plate surface, and a non-stretched polyester resin film that can withstand severe processing is coated on it. By using the resin-coated steel sheet of the present invention, even in the drawing step and the ironing step using the same method as the conventional method, without producing hair, drawing excellent in corrosion resistance using the resin-coated steel sheet. It is now possible to form ironing cans.

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) C23C 28/00 C23C 28/00 A C25D 5/26 C25D 5/26 B 5/48 5/48 (72) Inventor Keiichi Shimizu 1 At 1296 Higashitoyoi, Shimomatsu City, Yamaguchi Prefecture F-term in Technical Research Laboratory, Toyo Kohan Co., Ltd. (reference) 4K024 AA03 AA07 AB01 AB02 BA14 BB23 CA16 DB02 GA04 GA08 GA12 4K044 AA02 AB02 BA10 BA21 BB03 BC05 CA11 CA53 CA67

Claims (6)

[Claims] 1. A squeezed and squeezed can for which the can bottom and the can wall are integrated.
Of the resin-coated steel sheet of C: 0.003% by weight or less,
Mn: 0.05-0.30% by weight, Si: 0.03% by weight
%, P: 0.02% or less of steel components included, yield strength
Is 400 to 600 N / mm², Total elongation is 30% or less
0.1 to 8.4 g / m on both sides of the steel plate ^TwoFormed by the amount of tin
Form a tin-plated layer that has been treated with molten tin on both sides
Squeezed with unstretched polyester resin film coated on
Resin-coated steel plate for iron cans. 2. The steel plate has a crystal plane (20) parallel to the plate surface.
0), (222) X-ray diffraction peak intensities P ₂₀₀ , P
Drawing and ironing the resin-coated steel sheet for a can according to claim 1, wherein the value of the surface intensity ratio _{P 222} × 100 _{/ P 2 00} is 50 or more at _222. 3. The steel plate has a plate thickness in the range of 1.1 to 1.4 times the steel plate thickness at the upper end of the can wall, and has a steel plate thickness of 0.13 to 0.13 at the upper end of the can wall. The resin-coated steel sheet for a drawn and ironed can according to any one of claims 1 and 2, wherein the steel sheet has a thickness of 0.17 mm. 4. A squeezing and squeezing can in which the can bottom and the can wall are integrated.
Of the resin-coated steel sheet of C: 0.003% by weight or less,
Mn: 0.05-0.30% by weight, Si: 0.03% by weight
% Or less, P: 0.02% or less of steel component is included, and the plate surface is flat
X-ray diffraction peak intensity of crystal planes (200) and (222)
Degree P₂₀₀, P₂₂₂Surface strength ratio P₂₂₂× 10
0 / P₂₀₀Value of 50 or more, yield strength of 400 to 60
0 N / mm², On both sides of steel sheet with total elongation of 30% or less
0.1-8.4g / m per side ^TwoAmount of tinned
Molten tin by heating to a temperature above the melting point of tin
After that, unstretched polyester resin film on both sides
And press them together with a pair of pressure rolls for crimping.
A method for producing a resin-coated steel sheet for a drawn and ironed can. 5. The method for producing a resin-coated steel sheet according to claim 4, wherein the unstretched polyester resin film is pressure-bonded by heating the steel sheet to a temperature not higher than the melting point of tin. 6. A drawn and ironed can formed by using the resin-coated steel sheet for a drawn and ironed can according to claim 1.