JPS6036478B2 - Drawn ironing can and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drawn and ironed dovetail made of a surface-treated steel plate and a method for manufacturing the same, and more specifically, the present invention relates to a drawn and ironed dovetail made of a surface-treated steel plate, and more particularly, a drawing and ironed dovetail made of a conventional tin-plated steel plate, which has a reduced amount of tin plating. The present invention relates to a drawn and ironed Yoyo which has significantly improved paint adhesion and corrosion resistance while maintaining it at a significantly lower level, and a method for producing the same.

The bonito body obtained by drawing the metal material between a punch and die and then ironing the bonito body has no seams at the joints between the bonito body, the bonito arms, and the bonito bottom, and has a good appearance and a smooth bottom. It has the advantage that operations such as wrapping the lid and forming seams are not required, and the same part of the basket 8 is thinner, requiring less metal material, making it suitable for applications such as filling beverages. widely used. The metal material for this drawing iron must naturally be a material with good workability, and from this point of view relatively expensive metal materials such as aluminum plate or tin plated steel plate (tin plate) are generally used. There is. Even within this material,
Regarding tin-plated steel sheets, there is a problem of depletion of tin resources.
Due to the economic constraints that the cost of tin increases year by year, it is desirable to reduce the amount of tin plating as much as possible. However, the tin-plated layer acts as a solid lubricant during drawing and ironing of the tin-plated steel sheet, and acts as a protective coating layer against corrosion of the mold after processing. Attempts to reduce the amount of tin plating are constrained from the viewpoints of processability and corrosion resistance.

Thus, at present, tin-plated steel sheets for drawing and ironing are only in practical use with a tinness of #50 to #100 (tin plating amount of 5.6 to 11 mm). The present inventors have developed a metal material for drawing and ironing that has a tin plating amount of 0.05 to 2.0 mm, which is considerably lower than conventional materials.
Use a tin-plated steel plate within the range of 8mm/〆 (in this specification, the amount of tin plating and the amount of tin are defined as values per side), and also reduce the roughness of the surface of the tin-plated steel plate. When the thickness is selected within a certain range, a certain area ratio of the iron surface is exposed on the surface that will become the dovetail body during the drawing and ironing process, and quite surprisingly, such iron surface is not exposed. The adhesion of the paint is rather improved compared to the overall body consisting of a tin-plated layer, and as a result, the corrosion resistance is significantly improved. We have discovered that it can be manufactured with high productivity using the following materials.

That is, the object of the present invention is to provide a drawer which maintains tin plating to a significantly lower level than conventional drawers made of tin-plated steel plates, and which also has significantly improved paint adhesion and corrosion resistance. The purpose of the present invention is to provide an ironing key and a method for manufacturing the same.

Another object of the present invention is to maintain the surface of a metal material for drawing and ironing in a state of a metal tin plating layer sufficient to exhibit a sufficient solid lubricant action during drawing and ironing.
On the other hand, it is an object of the present invention to provide a method for producing a drawn and ironed moth, in which a surface with excellent paint adhesion and corrosion resistance is formed on the surface after the drawing and ironing process is completed.

According to the present invention, it is obtained by subjecting a surface-treated steel plate to drawing and ironing, and is composed of a relatively thick scale bottom part and a relatively thin scale base part, and the rice cake body part and the can crab In a squeezed scale that does not have a joint between the body and the bottom of the coin, the groove body of the squeezed rice cake has a diameter of 0.01 to 1.7 female/
It has a surface layer containing tin, and the surface layer has an exposed area ratio]
There is provided a straining iron comprising a combination of 5 to 80% iron surface and a tin-iron alloy layer and/or a tin-plated layer, and the surface of the bottom of the wire comprises a tin-plated coating layer. Ru.

According to the present invention, there is further provided a method for manufacturing a tin-plated steel plate comprising subjecting a tin-plated steel plate to drawing and ironing between a punch and a die, in which the tin-coated steel plate has a tin plating amount of 0. Using a tin-plated steel plate with a roughness of 0.05 to 2.8 mm and an average surface roughness of 0.2 to 4 microns, ironing is performed at an ironing rate of 40 to 80% to remove tin on the surface of the side wall of the cup. A method for producing a drawn and ironed key is provided, which comprises performing a heat treatment to convert a plating layer into a tin-iron alloy layer.

The present invention will be described in detail based on specific examples shown in the accompanying drawings.

In FIG. 11A, which shows the overall structure of the squeeze key of the present invention, the body 1 is comprised of a key 8, generally designated by 2, and a key part, generally designated by 3.

The side surface of this beard trunk 2 and the connection part 4 between the key chest 2 and the bottom part 3
There are virtually no seams. As will be detailed later, the mustache chest 2 is formed by drawing a metal material between a punch and a die and then ironing it, and as a result, its thickness is thinner than that of the saddle bottom 3. . A thick-walled flange 6 is provided at the upper edge of the chestnut chest 2 via a neck 5 if desired, and double-wound vertically is possible between it and the peripheral edge of a dovetail end member (not shown). It has become.

In addition, a smooth spherical protrusion (dome) 7 is provided on the inside of the rice cake bottom 3, which prevents the rice cake bottom 3 from protruding outward due to the pressure of the contents and makes it easier for the mother to sit. It's becoming like this. An important feature of the squeeze moth of the present invention is that the surface of the whisker bottom part 3 is made of a tinned coating layer, whereas the bottom part 2 has a weight of 0.01 to 1.70 g, especially 0.01 to 1.70 g.
1 to 1. It has a surface layer containing significantly less tin, and this surface layer has an exposed area ratio of 15 to 80%, particularly 25 to 60%, of an iron surface, a tin-iron alloy layer and/or a tin-plated layer. It consists of a combination of

That is, in the present invention, the above-described amount of tin in the bonito body 2 exists in the form of a tin-iron alloy layer or a tin-plated layer, but from a microscopic perspective, the iron surface that does not contain tin is exposed. A notable feature is that Conventionally, in the field of foundation weaving, various surface-treated steel plates have been used to suppress the elution of iron into the contents, and even with these surface-treated steel plates, the exposed iron surface is It was considered undesirable.

On the other hand, according to the present invention, the adhesion of the paint can be improved by exposing the iron surface of a certain area ratio on the surface of the key body formed by drawing and ironing from a tin-plated steel plate. This fact will become clear by referring to FIG. 4, which is a plot of the relationship between the iron exposed area ratio and the beer strength of the coating film. Moreover, conventional tin-plated steel sheets for drawing and ironing had a relatively large amount of tin plating as already mentioned above, but according to the present invention, the total amount of tin present on the surface of the drawing and ironing can be reduced. Although the level is significantly lower than that of conventional products, it is possible to easily draw and iron the seaweed without impairing workability, and the paint adhesion and corrosion resistance of the housing can be significantly improved. .

In FIG. 2, which shows an enlarged cross-section of the vertical bottom part 3, the bottom wall 3 includes a steel plate substrate 8, a tin-plated coating layer 9, and a tin layer optionally interposed between the substrate 8 and the tin-plated coating layer 9. - consists of an iron alloy layer 10;

Since this foundation bottom part 3 has not undergone drawing and ironing processing, the amount of tin is 0.05 to 2.80 g, which is the same as the raw material.
/〆, and the average surface roughness is in the range of 0.2 to 4 microns. In FIG. 3-A showing an enlarged example of the surface structure of the sewing body 2, the side wall is made up of a steel plate substrate 11 and a metal tin layer 12 on the steel plate substrate, and microscopically speaking, it is partially made of iron. An exposed surface 13 is present.

In FIG. 31B showing another example of the surface texture of this horse mackerel body 2, this side wall is made up of a steel plate substrate 11 and a tin-iron alloy layer 14 on the steel plate substrate, and microscopically speaking, the side wall is made of a steel plate substrate 11 and a tin-iron alloy layer 14 on the steel plate substrate. - There is also a partial iron protrusion 13 between the iron alloy layers. In some cases, a metal-deficient tin layer 12 is present on the tin-iron alloy layer 14. In this specification, the exposed area ratio of the iron surface of the clay body side wall 2 and the tin-iron alloy layer refers to a value obtained by the following measuring method.

That is, using a potentiostat (constant voltage electrolyzer),
saturation power. Using a Mel electrode as a reference electrode and platinum as a counter electrode, the surface of the fin trunk of the object to be measured with a certain area exposed was first exposed in a 0.08N anhydrous sodium carbonate aqueous solution adjusted to pH 9.5 with sodium bicarbonate. -20 melon hV to -14
Polarize to 5 hV, then -145 hV to 155 hV
Polarize it to hV, and finally obtain the polarization curve.
Polarize from 2 hV to -130 V. In either case, polarization is carried out continuously at a constant rate of 100 skin V/min. This polarization curve is shown in FIG. Note that, prior to measurement, a pre-operation is performed as necessary to remove dirt, oxide film, and surface treatment film on the surface of the object to be measured. -450 of this polarization curve
One peak was observed between 180 hV and 180 hV, which is due to the sum of the iron surface and the tin-iron alloy. A maximum of three peaks are observed between 1100 hV and -125 hV in this polarization curve, and the first peak that appears is for tin, the second peak for iron, and the third peak for tin-iron alloy. This was caused by These peaks can be seen by taking the above polarization curves of pure substances and their known mixtures. Tin-
As shown in Fig. 4, the exposed area ratio S^ of the iron alloy layer is -
If the peak height of the tin-iron alloy layer of the sample to be measured that appears near 115 skin V is hs, then S^;0.2
Defined as 1×hs [%].

Since the peak of iron from -100 hV to -125 hV is not quantitatively accurate, the exposed area ratio SB of the iron surface is determined by increasing the peak height of -450 to -80 skin V in Figure 4 A/ The sea is defined as SB 0.52 (hp - 0.14 x hs).

In the present invention, the area ratio of the iron exposed surface is 15 to 80%,
In particular, it is important that it is in the range of 25 to 60%.

In other words, if this area ratio is smaller than the above range, no significant improvement in paint film adhesion can be expected; on the other hand, making it larger than the above range is a problem from a processing standpoint and rust prevention. undesirable. In order to produce the drawn and drawn bonito of the present invention, the amount of tin plating is 0.05 to 2.8 pieces/piece, especially the outer surface of the squeezed bonito is 1.00 to 2.8 pieces/piece, In addition, the surface that becomes the inner surface is in the range of 0.05 to 2.8 mm, and the average roughness (Ha) of the surface is 0.2 to 4 microns.
It is particularly important to use tinned steel sheets in the range of 0.5 to 2 microns. In the present invention, if the amount of plating is less than the above-mentioned range, the drawing and ironing workability tends to be significantly reduced, while if the amount of plating is more than the above-mentioned range, the iron surface may be exposed on the surface. This becomes difficult.

In addition, surface roughness is also related to both iron surface exposure and workability, and when the roughness is smaller than the above range, workability with a low plating amount decreases, and iron surface exposure also falls within the scope of the present invention. It is difficult to achieve this, and if the roughness is greater than the above range, there will be too much iron surface mist, which will likely result in reduced workability and poor appearance due to ants. The tin-plated steel plate used is a low-carbon rolled steel plate coated with a haze of tin in the amount described above. ), but even bright plates (reflow plates) that have been subjected to melting treatment after plating can be used for the purpose of the present invention as long as their roughness is within the above range.

In order to expose the iron surface on the paulownia wall, it is important to draw and iron the ironing process at a certain ironing rate or higher.
%, particularly preferably in the range of 50 to 70%.

In the squeezing process of the present invention, the squeezing rate (RD) is defined as: When the thickness of the fin base 3 is D, and the thickness of the scale thorax 2 is d,
Shiki obi XI.

. =RD is defined.

In addition, the thickness of each of these parts is D = 0.27 to 0.5 m. d=0.080 to 0.22 It is desirable that it be within the range of .

The drawing and ironing process can be easily carried out by means known per se, using a combination of a punch and a die, which are known per se, and supplying a lubricant between the material and the die if necessary.

Although the drawing and ironing process may be performed in one stage, it is generally desirable to perform the drawing process and ironing process in multiple stages. Thus, the cup side wall portion subjected to the drawing and ironing process exhibits the surface structure shown in FIG. 3-A or 3-B. 31st A
Although it is possible to use the cup with the surface structure shown in the figure as it is, if desired, the cup may be heat-treated to remove part or all of the remaining tinned layer as shown in Figure 31B.
It can also be converted into an iron alloy layer and used as scales.

According to this aspect of the present invention, rather than leaving the thinned tin-plated layer as it is on the surface of the bonito body, the tin-plated layer is heated to form a tin-iron alloy layer. By converting it, the adhesion of paints and the like and corrosion resistance can actually be improved.

In this case, the tin-iron alloy layer is formed by thermal diffusion of metallic tin as the plating layer and iron as the substrate, but it is important to prevent the iron surface from being excessively oxidized.
For this purpose, the heat treatment is performed at temperatures above 15,000 to the melting point of tin (23
This can be easily carried out by heating at a temperature not exceeding 20) for a period of 19 seconds to 10 minutes. In order to prevent excessive oxidation or rust on the iron surface, or to prevent pitting corrosion of the iron surface due to the contents, phosphate treatment or phosphoric acid treatment. Muic acid treatment,
In some cases, it may be desirable to apply a general surface treatment such as chromic acid treatment to make the exposed iron surface rust-free. The cup thus obtained is trimmed, degreased and washed if necessary, then painted or printed on the inner or outer surface, dried, and dusted.

Next, one-stage or multi-stage necking processing is performed, and finally flange processing is performed to obtain the final scale body. There are also cases where the beard body is processed with beads, etc. Since the squeezed iron paste of the present invention has excellent adhesion to paint, cracks and pinholes will not occur in the paint film even when applied to bead processing such as bonito ears or multi-stage necking processing of two or three stages. It is also a significant advantage of the present invention that it is possible to obtain a cellulose having excellent corrosion resistance, in which the paint adheres well to the base metal, and the degree of metal exposure is negligible from the viewpoint of the contents. The invention is illustrated by the following example.

Example 1 Base plate thickness 0.32 skin, hardness T-2,'2, surface roughness Ral
A matt-plated steel plate with a tin coating of 1.7 g (inner and outer surfaces) is punched into a disc with a diameter of about 145 mm, and a cup with an inner diameter of about 72 ribs is punched between a drawing punch and a drawing die according to the usual method. Shape into shape.

Next, it was ironed using a combination of ironing punch and ironing die.

The dimensions and physical properties of this fin body are as follows. Thickness of the bottom wall (D) 0.32 Thickness of the same wall as the ribs (d) 0.0 Repulsion rate
72% kasu8oka inner diameter
65.4 rib neck inner diameter
61.0Kutsuki same height
122 side iron exposed area ratio 35
After degreasing and cleaning the inside and outside of this Antsukioka, it was painted with epoxy/suria paint.

This coating adhesion is 0.3 to 0.5 at 180o beer strength.
It was a k9/5 sail. After processing the Nequin, it was filled with carbonated drink (cola) and made into a kasuzumi (filler), which was then stored at 50o0. One month and six months later, the bonito flakes were removed and the inner surface of the eyes was observed.

As a result, the twill body of the present invention can be used not only after one month but also after 6 months.
Even after storage for months, no pitting corrosion was observed on the beard trunk, and no abnormalities such as peeling of the coating were observed. In addition, in order to evaluate in detail the adhesion with the exterior paint, we filled the aircraft of the present invention with a white coat and finishing varnish on the exterior surface and filled it with the contents of a carbonated beverage containing low fruit juice. Alternatively, the key body of the present invention was subjected to heating and heat sterilization treatment using a bust riser or the like, but the key body of the present invention did not exhibit any abnormalities such as peeling of the white coat or finishing varnish even after undergoing these heat cycles. Furthermore, in order to clarify the excellent effects of the present invention, a total control sample other than the present invention was prepared in the same manner as in Example 1 above, except for the following changes.

'1} Control cage A Surface roughness Rao. 11m, tin adhesion amount 11. Bonito body (2) Control body B Surface roughness: Rao. 1 French meter, tin adhesion amount 5. The iron exposed area ratio and coating film adhesion strength (18 mm and beer strength) were determined for the two types of control fabrics mentioned above and the overall structure of Example 1. A comparative evaluation was made of the inner side of Tsukioka.

☆As is clear from the above comparison results, it has been confirmed that the exposed iron area affects the coating adhesion, and it is clear that an excellent ryo body can be obtained by selecting it within the scope of the present invention. became. Example 2 The amount of tin deposited on the inner and outer surfaces of a blank plate with a surface assemblage Ra of 2 m is 1.7 mm/m on the outer surface and 0.0 mm on the inner surface. Omitted/As a pillow, a squeezed body was prepared, a beard body was created by the same process as in Example 1, and the adhesion of the coating film on the inner surface was measured, and it was 1.0k.
It showed a strength of 9/5 ribs or higher.

Where epoxy/phenol-based paint is applied, the adhesion of the paint film is 3.5k9/5 or more for the inner surface and 1.5k9/5 for the outer surface.
It showed strength of more than 5 legs. At this time, the iron exposed area ratio was 35% on the outer surface and 60% on the inner surface.

Example 3 In order to evaluate suitability for content resistance, the ant shells of Example 1 and controls A and B were washed and then adjusted to pH 4. An aqueous sodium salt solution of phosphoric acid having a concentration of 2.5% was sprayed at 8,000 yen for 20 seconds on the inner and outer surfaces of the key Tsukioka to form a surface treatment film and passivate the iron surface.

Afterwards, I applied epoxy paint to the beard and arms. These grooves were filled with carbonated drinks (coffee type, citric acid type) and stored in a storage room at 50°C for 6 months, then opened, and the amount of dissolved iron was measured and the state of pitting corrosion was observed. did.

The corroded parts of the cola-based contents of these rice cake barrels were near the seaming part of the neck part and in the seaming process part. The pitting corrosion occurred near the wrapped cotton in the neck area. From the above results, it was confirmed that the bonito body of the present invention had sufficient saddle performance without any abnormalities observed in its content resistance.

Example 4 Base board thickness 0.32 sail, hardness T-2. /2, surface roughness Ra
o. 5mm tin adhesion amount 2. A bright plated steel plate (on both the inner and outer surfaces) was ironed and painted in the same manner as in Example 1.

At this time, the iron exposed area ratio was 30%, and the coating film adhesion at 180o beer strength was as good as 0.4 kg/5 capes.
Example 5 A three-stage necking process was performed on the rice bran barrel coated with the epoxyphenol coating of Example 2, and the diameter after necking was 57.
Processed into ribs.

This key was filled with a carbonated drink (cola type) and stored at 50°C for 6 months, after which it was opened and evaluated. As a result, pitting corrosion did not occur. Further, the amount of dissolved iron was 0.4 ppm, and no abnormality of internal purulence was observed, which was good. Example 6 A peed was applied to the bonito arm coated with the epoxyphenol paint of Example 2, and the diameter after necking was processed to the 61 side.

The bottle was filled with 50% orange juice, the head space was filled with nitrogen, and the lid was tightened. After storage at 3700 for 6 months, the quality was evaluated.

The amount of dissolved iron is 1 ppm, the amount of dissolved tin is 0.1 ppm or less,
It was in good condition with no abnormalities such as lifting of the inner coating film. Example 7 The following experiment was conducted to demonstrate that the exposed area ratio in the present invention is greatly influenced by the amount of tin plating on the original plate and has a significantly large effect on the adhesion of the coating film.

'11 Creation of tin plate Non-refloating tin plate with base plate thickness 0.32 side with tin amount from #5 (tin adhesion amount 0.5 keys/me) to #100 (tin adhesion amount 11.2 keys/second) was subjected to drawing and ironing according to the method described in Example 1 to obtain drawn and ironed bonito.

The obtained squeezed and ironed bonito was heat treated at 205°C for 5 minutes.

[2- Creation of glue] #15 (tin coating amount: 1.68 g) plating tin paste floating plate and #100 (tin coating amount: 11. crab/re) plating glue floatin plate in Example 1. It was subjected to a drawing and ironing process according to the method described and used as a drawing and ironing foundation.

The obtained squeezed rice cake was heat-treated at each temperature of 150 to 225 qo for 5 minutes. Glue Measurement of iron surface exposed area ratio (S8) Regarding the coins obtained in '1} above, 15 winds x 4 from the connecting body
Cut out the strip on the 5th side.

Tape with a single round window is attached to both sides of the sample for measurement, and the back side is sealed with full-surface tape. The exposed area ratio (SB) of iron was determined according to the method described in the specification.

The obtained results are plotted with the plating amount of the original plate as the horizontal axis and the exposed iron area ratio as the vertical axis, and this diagram is shown in FIG. From this result, the iron exposed area ratio (SB) in a no-reflow-tained plate is greatly influenced by the amount of tin plating on the original plate, and the smaller the amount of tin plating on the original plate, the smaller the iron exposed area ratio (S8). It is understood that for phosphorus from #100, this value is less than 5% even if heat treated.

{41 Paint film adhesion test Remove the bottom part of the squeezed cloth obtained in 01 above,
This cylinder is cut in the slow direction to form a square plate.

Next, apply epoxyphenol paint using a roll coder, and apply 20500-1 paint for a minute. Furthermore, strips of medium-sized skin were cut out from this, and nylon was sandwiched as an adhesive between the two strips with the paint on the inside.

This was heated for 200 oo-1 minute while applying pressure to bond the nylon and the paint. This sample was subjected to a 180 degree beer test to measure the adhesive strength. The obtained results are plotted with the iron exposed area ratio (S8) as the horizontal axis and the beer strength as the vertical axis, and this diagram is shown in FIG.

In addition, a beer test was conducted in the same manner for the drawing and ironing results obtained in step ① above, and the obtained results were plotted with the exposed area ratio (S^) of the tin-iron alloy layer on the horizontal axis and the peel strength on the vertical axis. This diagram is shown in FIG.

From the results shown in FIG. 6, it becomes clear that as the iron exposed area ratio (SB) becomes larger than 15%, the beer strength of the coating film increases rapidly.

In this case, the peel strength of the coating film is close to zero when the original plate has a large amount of tin plating. Further, from the results shown in FIG. 7, it is clear that the beer strength of the coating film increases when the exposed surface lighting ratio (S^) of the tin-iron alloy layer becomes 25% or more.

'5' Measurement of the amount of tin-iron alloy A 4 square inch disk was punched out from the side wall of the drawn and ironed rice cake obtained in ① above, one side of the disk was sealed with tape, and the plate was placed in a 1N HCI electrolyte. Using the sample as an anode, electrolyze with a constant current of 25 hA.

The potential on the sample surface at this time is recorded using the silver electrode as a reference electrode.

From this chart, calculate the amount of electricity required for electrolysis of FeS
Convert to ratio. The obtained results were plotted by taking the processing temperature as horizontal koji and the amount of tin-iron alloy as vertical, and setting the sample from #15 reflow plate as 1 porridge and the sample from #100 no-reflow plate as 100N.

This diagram is shown in Figure 8. This result reveals the fact that as the treatment temperature increases, the amount of tin-iron alloy increases.

[6] Measurement of the exposed area ratio (S^) of the tin-iron alloy layer Cut a strip of 15 sides x 45 skins from the body of the drawn and ironed foundation obtained in ① above, and place a circle with one ground on the measurement surface of the sample. Paste the tape with the window raised, and seal the back side with full-length tape.

Next, the exposed area ratio (S^) of the tin-iron alloy layer is determined by the method described in this specification. The obtained results are based on the processing temperature and the exposed area ratio (SA) of the tin-iron alloy layer, with the whisker from the #15 reflow board as one ball and the dovetail from the #100 no-reflow board as 100N. The graph is shown in FIG. 9.

From this result, it can be seen that in the machine of the present invention (1 station), the exposed area ratio (S^) of the tin-iron alloy layer is in the range of 25 to 80%, whereas the weaving from the original plate with a large amount of tin plating ( Although the tin-iron alloy layer is increasing in the case of 10 sails, this alloy layer is not exposed much and the exposed area ratio is less than 10%.

'7} Paint Film Tape Peeling Test Among the strips obtained in '11 above, #5, #15, and #100 cypress baits were cut out, coated with epoxy urea paint, and this paint film was baked. .

Next, a cross cut was made in the coating film with a razor blade, and after scotch tape #610 was glued to the cross cut portion, the tape was peeled off vigorously. Furthermore, this was immersed in C Ship 04 solution to precipitate copper, and the parts where the paint had peeled off were observed. From this observation result, almost no peeling was observed next to the present invention (#5, #15), but in the case of #1
In the 00 beard, the paint film near the crosscut had peeled off considerably.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the overall structure of the squeezing and ironing tower of the present invention, Fig. 2 is an enlarged view of the cross section of the sieve bottom part 0 of the squeezing and ironing saddle of Fig. 1, and Fig. 31A is , A diagram showing an enlarged example of the surface structure of the total 8 Abe m of the drawing book shown in Figure 1, Figure 3
Figure -B is an enlarged view of another example of the surface structure of the blood on the bearded arm of the squeezed rice cake in Figure 1, and Figure 4 shows the relationship between the iron exposed area ratio and the beer strength of the coating film. The plotted edge diagram, Figure 5, is a polarization curve showing the relationship between the polarization of the surface of the cutting drum and the amount of reduction current, and Figure 6 is a diagram showing the relationship between the plating amount of the original plate and the exposed iron area ratio. Figure 7 is a diagram showing the relationship between the exposed area ratio of the tin-iron alloy layer and beer strength, and Figure 8 is a diagram showing the relationship between the exposed area ratio of the tin-iron alloy layer and the beer strength.
FIG. 9 is a diagram showing the relationship between the amount of iron alloy and the relationship between the treatment temperature and the keyed area ratio of the tin-iron alloy layer. Reference number 1 is the base body, 2 is the woven body, 3 is the bottom part, 4 is the connection part between the bonito breast and the bonito bottom part, 5 is the neck, 6 is the flange, 7
1 is a dome, 8 is a steel plate substrate, 9 is a coating layer, 1 is a tin-iron alloy layer, 11 is a steel plate substrate, 12 is a metal tin layer, 13 is an exposed iron surface, and 14 is a tin-iron alloy layer. Figure 1 Figure 2 Figure 3-A Figure 3-B Figure 5 Figure 4 Figure 7 Figure 6 Figure 8 Figure 9

Claims (1)

[Scope of Claims] 1. A can body obtained by subjecting a surface-treated steel plate to drawing and ironing, and consisting of a relatively thick-walled can bottom and a relatively thin-walled can body; In a drawn ironing can which has no seam at the connection part between the part and the bottom of the can, the can body of the drawn ironing can has a surface layer containing 0.01 to 1.70 g/m^2 of tin; The surface layer has an exposed area ratio of 15 to 80
1. A drawing and ironing can comprising a combination of a tin-iron alloy layer and/or a tin-plated layer, and a tin-plated coating layer on the bottom surface of the can. 2. In a method for manufacturing a tin-plated steel can, which involves subjecting a tin-plated steel plate to drawing and ironing processing between a punch and a die, the amount of tin plating is 0.05 to 0.05. A tin-plated steel plate of 2.80 g/m^2 and an average surface roughness of 0.2 to 4 microns is used, and ironing is performed at an ironing rate of 40 to 80% to coat the surface of the side wall of the cup with tin. 1. A method for producing a drawn and ironed can, which comprises performing heat treatment to convert the tin-plated layer into a tin-iron alloy layer.